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S/390: ifunc: Fix for undefined 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_GOTOFF16:
1116 case R_390_GOTOFF32:
1117 case R_390_GOTPC:
1118 case R_390_GOTPCDBL:
1119 /* These relocs do not need a GOT slot. They just load the
1120 GOT pointer itself or address something else relative to
1121 the GOT. Since the GOT pointer has been set up above we
1122 are done. */
1123 break;
1124
1125 case R_390_PLT12DBL:
1126 case R_390_PLT16DBL:
1127 case R_390_PLT24DBL:
1128 case R_390_PLT32DBL:
1129 case R_390_PLT32:
1130 case R_390_PLTOFF16:
1131 case R_390_PLTOFF32:
1132 /* This symbol requires a procedure linkage table entry. We
1133 actually build the entry in adjust_dynamic_symbol,
1134 because this might be a case of linking PIC code which is
1135 never referenced by a dynamic object, in which case we
1136 don't need to generate a procedure linkage table entry
1137 after all. */
1138
1139 /* If this is a local symbol, we resolve it directly without
1140 creating a procedure linkage table entry. */
1141 if (h != NULL)
1142 {
1143 h->needs_plt = 1;
1144 h->plt.refcount += 1;
1145 }
1146 break;
1147
1148 case R_390_GOTPLT12:
1149 case R_390_GOTPLT16:
1150 case R_390_GOTPLT20:
1151 case R_390_GOTPLT32:
1152 case R_390_GOTPLTENT:
1153 /* This symbol requires either a procedure linkage table entry
1154 or an entry in the local got. We actually build the entry
1155 in adjust_dynamic_symbol because whether this is really a
1156 global reference can change and with it the fact if we have
1157 to create a plt entry or a local got entry. To be able to
1158 make a once global symbol a local one we have to keep track
1159 of the number of gotplt references that exist for this
1160 symbol. */
1161 if (h != NULL)
1162 {
1163 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1164 h->needs_plt = 1;
1165 h->plt.refcount += 1;
1166 }
1167 else
1168 local_got_refcounts[r_symndx] += 1;
1169 break;
1170
1171 case R_390_TLS_LDM32:
1172 htab->tls_ldm_got.refcount += 1;
1173 break;
1174
1175 case R_390_TLS_IE32:
1176 case R_390_TLS_GOTIE12:
1177 case R_390_TLS_GOTIE20:
1178 case R_390_TLS_GOTIE32:
1179 case R_390_TLS_IEENT:
1180 if (bfd_link_pic (info))
1181 info->flags |= DF_STATIC_TLS;
1182 /* Fall through. */
1183
1184 case R_390_GOT12:
1185 case R_390_GOT16:
1186 case R_390_GOT20:
1187 case R_390_GOT32:
1188 case R_390_GOTENT:
1189 case R_390_TLS_GD32:
1190 /* This symbol requires a global offset table entry. */
1191 switch (r_type)
1192 {
1193 default:
1194 case R_390_GOT12:
1195 case R_390_GOT16:
1196 case R_390_GOT20:
1197 case R_390_GOT32:
1198 case R_390_GOTENT:
1199 tls_type = GOT_NORMAL;
1200 break;
1201 case R_390_TLS_GD32:
1202 tls_type = GOT_TLS_GD;
1203 break;
1204 case R_390_TLS_IE32:
1205 case R_390_TLS_GOTIE32:
1206 tls_type = GOT_TLS_IE;
1207 break;
1208 case R_390_TLS_GOTIE12:
1209 case R_390_TLS_GOTIE20:
1210 case R_390_TLS_IEENT:
1211 tls_type = GOT_TLS_IE_NLT;
1212 break;
1213 }
1214
1215 if (h != NULL)
1216 {
1217 h->got.refcount += 1;
1218 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1219 }
1220 else
1221 {
1222 local_got_refcounts[r_symndx] += 1;
1223 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1224 }
1225 /* If a TLS symbol is accessed using IE at least once,
1226 there is no point to use dynamic model for it. */
1227 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1228 {
1229 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1230 {
1231 (*_bfd_error_handler)
1232 (_("%B: `%s' accessed both as normal and thread local symbol"),
1233 abfd, h->root.root.string);
1234 return FALSE;
1235 }
1236 if (old_tls_type > tls_type)
1237 tls_type = old_tls_type;
1238 }
1239
1240 if (old_tls_type != tls_type)
1241 {
1242 if (h != NULL)
1243 elf_s390_hash_entry (h)->tls_type = tls_type;
1244 else
1245 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1246 }
1247
1248 if (r_type != R_390_TLS_IE32)
1249 break;
1250 /* Fall through. */
1251
1252 case R_390_TLS_LE32:
1253 /* For static linking and executables this reloc will be
1254 calculated at linktime otherwise a TLS_TPOFF runtime
1255 reloc will be generated. */
1256 if (r_type == R_390_TLS_LE32 && bfd_link_pie (info))
1257 break;
1258
1259 if (!bfd_link_pic (info))
1260 break;
1261 info->flags |= DF_STATIC_TLS;
1262 /* Fall through. */
1263
1264 case R_390_8:
1265 case R_390_16:
1266 case R_390_32:
1267 case R_390_PC16:
1268 case R_390_PC12DBL:
1269 case R_390_PC16DBL:
1270 case R_390_PC24DBL:
1271 case R_390_PC32DBL:
1272 case R_390_PC32:
1273 if (h != NULL)
1274 {
1275 /* If this reloc is in a read-only section, we might
1276 need a copy reloc. We can't check reliably at this
1277 stage whether the section is read-only, as input
1278 sections have not yet been mapped to output sections.
1279 Tentatively set the flag for now, and correct in
1280 adjust_dynamic_symbol. */
1281 h->non_got_ref = 1;
1282
1283 if (!bfd_link_pic (info))
1284 {
1285 /* We may need a .plt entry if the function this reloc
1286 refers to is in a shared lib. */
1287 h->plt.refcount += 1;
1288 }
1289 }
1290
1291 /* If we are creating a shared library, and this is a reloc
1292 against a global symbol, or a non PC relative reloc
1293 against a local symbol, then we need to copy the reloc
1294 into the shared library. However, if we are linking with
1295 -Bsymbolic, we do not need to copy a reloc against a
1296 global symbol which is defined in an object we are
1297 including in the link (i.e., DEF_REGULAR is set). At
1298 this point we have not seen all the input files, so it is
1299 possible that DEF_REGULAR is not set now but will be set
1300 later (it is never cleared). In case of a weak definition,
1301 DEF_REGULAR may be cleared later by a strong definition in
1302 a shared library. We account for that possibility below by
1303 storing information in the relocs_copied field of the hash
1304 table entry. A similar situation occurs when creating
1305 shared libraries and symbol visibility changes render the
1306 symbol local.
1307
1308 If on the other hand, we are creating an executable, we
1309 may need to keep relocations for symbols satisfied by a
1310 dynamic library if we manage to avoid copy relocs for the
1311 symbol. */
1312 if ((bfd_link_pic (info)
1313 && (sec->flags & SEC_ALLOC) != 0
1314 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1315 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL
1316 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1317 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL
1318 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1319 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1320 || (h != NULL
1321 && (! SYMBOLIC_BIND (info, h)
1322 || h->root.type == bfd_link_hash_defweak
1323 || !h->def_regular))))
1324 || (ELIMINATE_COPY_RELOCS
1325 && !bfd_link_pic (info)
1326 && (sec->flags & SEC_ALLOC) != 0
1327 && h != NULL
1328 && (h->root.type == bfd_link_hash_defweak
1329 || !h->def_regular)))
1330 {
1331 struct elf_dyn_relocs *p;
1332 struct elf_dyn_relocs **head;
1333
1334 /* We must copy these reloc types into the output file.
1335 Create a reloc section in dynobj and make room for
1336 this reloc. */
1337 if (sreloc == NULL)
1338 {
1339 if (htab->elf.dynobj == NULL)
1340 htab->elf.dynobj = abfd;
1341
1342 sreloc = _bfd_elf_make_dynamic_reloc_section
1343 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1344
1345 if (sreloc == NULL)
1346 return FALSE;
1347 }
1348
1349 /* If this is a global symbol, we count the number of
1350 relocations we need for this symbol. */
1351 if (h != NULL)
1352 {
1353 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1354 }
1355 else
1356 {
1357 /* Track dynamic relocs needed for local syms too.
1358 We really need local syms available to do this
1359 easily. Oh well. */
1360 asection *s;
1361 void *vpp;
1362
1363 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1364 abfd, r_symndx);
1365 if (isym == NULL)
1366 return FALSE;
1367
1368 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1369 if (s == NULL)
1370 s = sec;
1371
1372 vpp = &elf_section_data (s)->local_dynrel;
1373 head = (struct elf_dyn_relocs **) vpp;
1374 }
1375
1376 p = *head;
1377 if (p == NULL || p->sec != sec)
1378 {
1379 bfd_size_type amt = sizeof *p;
1380
1381 p = ((struct elf_dyn_relocs *)
1382 bfd_alloc (htab->elf.dynobj, amt));
1383 if (p == NULL)
1384 return FALSE;
1385 p->next = *head;
1386 *head = p;
1387 p->sec = sec;
1388 p->count = 0;
1389 p->pc_count = 0;
1390 }
1391
1392 p->count += 1;
1393 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1394 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL
1395 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1396 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL
1397 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1398 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1399 p->pc_count += 1;
1400 }
1401 break;
1402
1403 /* This relocation describes the C++ object vtable hierarchy.
1404 Reconstruct it for later use during GC. */
1405 case R_390_GNU_VTINHERIT:
1406 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1407 return FALSE;
1408 break;
1409
1410 /* This relocation describes which C++ vtable entries are actually
1411 used. Record for later use during GC. */
1412 case R_390_GNU_VTENTRY:
1413 BFD_ASSERT (h != NULL);
1414 if (h != NULL
1415 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1416 return FALSE;
1417 break;
1418
1419 default:
1420 break;
1421 }
1422 }
1423
1424 return TRUE;
1425 }
1426
1427 /* Return the section that should be marked against GC for a given
1428 relocation. */
1429
1430 static asection *
1431 elf_s390_gc_mark_hook (asection *sec,
1432 struct bfd_link_info *info,
1433 Elf_Internal_Rela *rel,
1434 struct elf_link_hash_entry *h,
1435 Elf_Internal_Sym *sym)
1436 {
1437 if (h != NULL)
1438 switch (ELF32_R_TYPE (rel->r_info))
1439 {
1440 case R_390_GNU_VTINHERIT:
1441 case R_390_GNU_VTENTRY:
1442 return NULL;
1443 }
1444 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1445
1446 }
1447
1448 /* Update the got entry reference counts for the section being removed. */
1449
1450 static bfd_boolean
1451 elf_s390_gc_sweep_hook (bfd *abfd,
1452 struct bfd_link_info *info,
1453 asection *sec,
1454 const Elf_Internal_Rela *relocs)
1455 {
1456 struct elf_s390_link_hash_table *htab;
1457 Elf_Internal_Shdr *symtab_hdr;
1458 struct elf_link_hash_entry **sym_hashes;
1459 bfd_signed_vma *local_got_refcounts;
1460 const Elf_Internal_Rela *rel, *relend;
1461
1462 if (bfd_link_relocatable (info))
1463 return TRUE;
1464
1465 htab = elf_s390_hash_table (info);
1466 if (htab == NULL)
1467 return FALSE;
1468
1469 elf_section_data (sec)->local_dynrel = NULL;
1470
1471 symtab_hdr = &elf_symtab_hdr (abfd);
1472 sym_hashes = elf_sym_hashes (abfd);
1473 local_got_refcounts = elf_local_got_refcounts (abfd);
1474
1475 relend = relocs + sec->reloc_count;
1476 for (rel = relocs; rel < relend; rel++)
1477 {
1478 unsigned long r_symndx;
1479 unsigned int r_type;
1480 struct elf_link_hash_entry *h = NULL;
1481
1482 r_symndx = ELF32_R_SYM (rel->r_info);
1483 if (r_symndx >= symtab_hdr->sh_info)
1484 {
1485 struct elf_s390_link_hash_entry *eh;
1486 struct elf_dyn_relocs **pp;
1487 struct elf_dyn_relocs *p;
1488
1489 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1490 while (h->root.type == bfd_link_hash_indirect
1491 || h->root.type == bfd_link_hash_warning)
1492 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1493 eh = (struct elf_s390_link_hash_entry *) h;
1494
1495 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1496 if (p->sec == sec)
1497 {
1498 /* Everything must go for SEC. */
1499 *pp = p->next;
1500 break;
1501 }
1502 }
1503 else
1504 {
1505 Elf_Internal_Sym *isym;
1506
1507 /* A local symbol. */
1508 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1509 abfd, r_symndx);
1510 if (isym == NULL)
1511 return FALSE;
1512
1513 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1514 {
1515 struct plt_entry *plt = elf_s390_local_plt (abfd);
1516 if (plt[r_symndx].plt.refcount > 0)
1517 plt[r_symndx].plt.refcount--;
1518 }
1519 }
1520
1521 r_type = ELF32_R_TYPE (rel->r_info);
1522 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1523 switch (r_type)
1524 {
1525 case R_390_TLS_LDM32:
1526 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1527 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1528 break;
1529
1530 case R_390_GOTOFF16:
1531 case R_390_GOTOFF32:
1532 case R_390_GOTPC:
1533 case R_390_GOTPCDBL:
1534 break;
1535
1536 case R_390_TLS_GD32:
1537 case R_390_TLS_IE32:
1538 case R_390_TLS_GOTIE12:
1539 case R_390_TLS_GOTIE20:
1540 case R_390_TLS_GOTIE32:
1541 case R_390_TLS_IEENT:
1542 case R_390_GOT12:
1543 case R_390_GOT16:
1544 case R_390_GOT20:
1545 case R_390_GOT32:
1546 case R_390_GOTENT:
1547 if (h != NULL)
1548 {
1549 if (h->got.refcount > 0)
1550 h->got.refcount -= 1;
1551 }
1552 else if (local_got_refcounts != NULL)
1553 {
1554 if (local_got_refcounts[r_symndx] > 0)
1555 local_got_refcounts[r_symndx] -= 1;
1556 }
1557 break;
1558
1559 case R_390_8:
1560 case R_390_12:
1561 case R_390_16:
1562 case R_390_20:
1563 case R_390_32:
1564 case R_390_PC16:
1565 case R_390_PC12DBL:
1566 case R_390_PC16DBL:
1567 case R_390_PC24DBL:
1568 case R_390_PC32DBL:
1569 case R_390_PC32:
1570 if (bfd_link_pic (info))
1571 break;
1572 /* Fall through. */
1573
1574 case R_390_PLT12DBL:
1575 case R_390_PLT16DBL:
1576 case R_390_PLT24DBL:
1577 case R_390_PLT32DBL:
1578 case R_390_PLT32:
1579 case R_390_PLTOFF16:
1580 case R_390_PLTOFF32:
1581 if (h != NULL)
1582 {
1583 if (h->plt.refcount > 0)
1584 h->plt.refcount -= 1;
1585 }
1586 break;
1587
1588 case R_390_GOTPLT12:
1589 case R_390_GOTPLT16:
1590 case R_390_GOTPLT20:
1591 case R_390_GOTPLT32:
1592 case R_390_GOTPLTENT:
1593 if (h != NULL)
1594 {
1595 if (h->plt.refcount > 0)
1596 {
1597 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1598 h->plt.refcount -= 1;
1599 }
1600 }
1601 else if (local_got_refcounts != NULL)
1602 {
1603 if (local_got_refcounts[r_symndx] > 0)
1604 local_got_refcounts[r_symndx] -= 1;
1605 }
1606 break;
1607
1608 default:
1609 break;
1610 }
1611 }
1612
1613 return TRUE;
1614 }
1615
1616 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1617 entry but we found we will not create any. Called when we find we will
1618 not have any PLT for this symbol, by for example
1619 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1620 or elf_s390_size_dynamic_sections if no dynamic sections will be
1621 created (we're only linking static objects). */
1622
1623 static void
1624 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1625 {
1626 if (h->elf.root.type == bfd_link_hash_warning)
1627 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1628
1629 if (h->gotplt_refcount <= 0)
1630 return;
1631
1632 /* We simply add the number of gotplt references to the number
1633 * of got references for this symbol. */
1634 h->elf.got.refcount += h->gotplt_refcount;
1635 h->gotplt_refcount = -1;
1636 }
1637
1638 /* Adjust a symbol defined by a dynamic object and referenced by a
1639 regular object. The current definition is in some section of the
1640 dynamic object, but we're not including those sections. We have to
1641 change the definition to something the rest of the link can
1642 understand. */
1643
1644 static bfd_boolean
1645 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1646 struct elf_link_hash_entry *h)
1647 {
1648 struct elf_s390_link_hash_table *htab;
1649 asection *s;
1650
1651 /* STT_GNU_IFUNC symbol must go through PLT. */
1652 if (s390_is_ifunc_symbol_p (h))
1653 return TRUE;
1654
1655 /* If this is a function, put it in the procedure linkage table. We
1656 will fill in the contents of the procedure linkage table later
1657 (although we could actually do it here). */
1658 if (h->type == STT_FUNC
1659 || h->needs_plt)
1660 {
1661 if (h->plt.refcount <= 0
1662 || SYMBOL_CALLS_LOCAL (info, h)
1663 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1664 && h->root.type != bfd_link_hash_undefweak))
1665 {
1666 /* This case can occur if we saw a PLT32 reloc in an input
1667 file, but the symbol was never referred to by a dynamic
1668 object, or if all references were garbage collected. In
1669 such a case, we don't actually need to build a procedure
1670 linkage table, and we can just do a PC32 reloc instead. */
1671 h->plt.offset = (bfd_vma) -1;
1672 h->needs_plt = 0;
1673 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1674 }
1675
1676 return TRUE;
1677 }
1678 else
1679 /* It's possible that we incorrectly decided a .plt reloc was
1680 needed for an R_390_PC32 reloc to a non-function sym in
1681 check_relocs. We can't decide accurately between function and
1682 non-function syms in check-relocs; Objects loaded later in
1683 the link may change h->type. So fix it now. */
1684 h->plt.offset = (bfd_vma) -1;
1685
1686 /* If this is a weak symbol, and there is a real definition, the
1687 processor independent code will have arranged for us to see the
1688 real definition first, and we can just use the same value. */
1689 if (h->u.weakdef != NULL)
1690 {
1691 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1692 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1693 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1694 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1695 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1696 h->non_got_ref = h->u.weakdef->non_got_ref;
1697 return TRUE;
1698 }
1699
1700 /* This is a reference to a symbol defined by a dynamic object which
1701 is not a function. */
1702
1703 /* If we are creating a shared library, we must presume that the
1704 only references to the symbol are via the global offset table.
1705 For such cases we need not do anything here; the relocations will
1706 be handled correctly by relocate_section. */
1707 if (bfd_link_pic (info))
1708 return TRUE;
1709
1710 /* If there are no references to this symbol that do not use the
1711 GOT, we don't need to generate a copy reloc. */
1712 if (!h->non_got_ref)
1713 return TRUE;
1714
1715 /* If -z nocopyreloc was given, we won't generate them either. */
1716 if (info->nocopyreloc)
1717 {
1718 h->non_got_ref = 0;
1719 return TRUE;
1720 }
1721
1722 if (ELIMINATE_COPY_RELOCS)
1723 {
1724 struct elf_s390_link_hash_entry * eh;
1725 struct elf_dyn_relocs *p;
1726
1727 eh = (struct elf_s390_link_hash_entry *) h;
1728 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1729 {
1730 s = p->sec->output_section;
1731 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1732 break;
1733 }
1734
1735 /* If we didn't find any dynamic relocs in read-only sections, then
1736 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1737 if (p == NULL)
1738 {
1739 h->non_got_ref = 0;
1740 return TRUE;
1741 }
1742 }
1743
1744 /* We must allocate the symbol in our .dynbss section, which will
1745 become part of the .bss section of the executable. There will be
1746 an entry for this symbol in the .dynsym section. The dynamic
1747 object will contain position independent code, so all references
1748 from the dynamic object to this symbol will go through the global
1749 offset table. The dynamic linker will use the .dynsym entry to
1750 determine the address it must put in the global offset table, so
1751 both the dynamic object and the regular object will refer to the
1752 same memory location for the variable. */
1753
1754 htab = elf_s390_hash_table (info);
1755
1756 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1757 copy the initial value out of the dynamic object and into the
1758 runtime process image. */
1759 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1760 {
1761 htab->srelbss->size += sizeof (Elf32_External_Rela);
1762 h->needs_copy = 1;
1763 }
1764
1765 s = htab->sdynbss;
1766
1767 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1768 }
1769
1770 /* Allocate space in .plt, .got and associated reloc sections for
1771 dynamic relocs. */
1772
1773 static bfd_boolean
1774 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1775 {
1776 struct bfd_link_info *info;
1777 struct elf_s390_link_hash_table *htab;
1778 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1779 struct elf_dyn_relocs *p;
1780
1781 if (h->root.type == bfd_link_hash_indirect)
1782 return TRUE;
1783
1784 info = (struct bfd_link_info *) inf;
1785 htab = elf_s390_hash_table (info);
1786
1787 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1788 here if it is defined and referenced in a non-shared object. */
1789 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1790 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1791 else if (htab->elf.dynamic_sections_created
1792 && h->plt.refcount > 0)
1793 {
1794 /* Make sure this symbol is output as a dynamic symbol.
1795 Undefined weak syms won't yet be marked as dynamic. */
1796 if (h->dynindx == -1
1797 && !h->forced_local)
1798 {
1799 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1800 return FALSE;
1801 }
1802
1803 if (bfd_link_pic (info)
1804 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1805 {
1806 asection *s = htab->elf.splt;
1807
1808 /* If this is the first .plt entry, make room for the special
1809 first entry. */
1810 if (s->size == 0)
1811 s->size += PLT_FIRST_ENTRY_SIZE;
1812
1813 h->plt.offset = s->size;
1814
1815 /* If this symbol is not defined in a regular file, and we are
1816 not generating a shared library, then set the symbol to this
1817 location in the .plt. This is required to make function
1818 pointers compare as equal between the normal executable and
1819 the shared library. */
1820 if (! bfd_link_pic (info)
1821 && !h->def_regular)
1822 {
1823 h->root.u.def.section = s;
1824 h->root.u.def.value = h->plt.offset;
1825 }
1826
1827 /* Make room for this entry. */
1828 s->size += PLT_ENTRY_SIZE;
1829
1830 /* We also need to make an entry in the .got.plt section, which
1831 will be placed in the .got section by the linker script. */
1832 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1833
1834 /* We also need to make an entry in the .rela.plt section. */
1835 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1836 }
1837 else
1838 {
1839 h->plt.offset = (bfd_vma) -1;
1840 h->needs_plt = 0;
1841 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1842 }
1843 }
1844 else
1845 {
1846 h->plt.offset = (bfd_vma) -1;
1847 h->needs_plt = 0;
1848 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1849 }
1850
1851 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1852 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1853 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1854 we can save the dynamic TLS relocation. */
1855 if (h->got.refcount > 0
1856 && !bfd_link_pic (info)
1857 && h->dynindx == -1
1858 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1859 {
1860 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1861 /* For the GOTIE access without a literal pool entry the offset has
1862 to be stored somewhere. The immediate value in the instruction
1863 is not bit enough so the value is stored in the got. */
1864 {
1865 h->got.offset = htab->elf.sgot->size;
1866 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1867 }
1868 else
1869 h->got.offset = (bfd_vma) -1;
1870 }
1871 else if (h->got.refcount > 0)
1872 {
1873 asection *s;
1874 bfd_boolean dyn;
1875 int tls_type = elf_s390_hash_entry(h)->tls_type;
1876
1877 /* Make sure this symbol is output as a dynamic symbol.
1878 Undefined weak syms won't yet be marked as dynamic. */
1879 if (h->dynindx == -1
1880 && !h->forced_local)
1881 {
1882 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1883 return FALSE;
1884 }
1885
1886 s = htab->elf.sgot;
1887 h->got.offset = s->size;
1888 s->size += GOT_ENTRY_SIZE;
1889 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1890 if (tls_type == GOT_TLS_GD)
1891 s->size += GOT_ENTRY_SIZE;
1892 dyn = htab->elf.dynamic_sections_created;
1893 /* R_390_TLS_IE32 needs one dynamic relocation,
1894 R_390_TLS_GD32 needs one if local symbol and two if global. */
1895 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1896 || tls_type >= GOT_TLS_IE)
1897 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1898 else if (tls_type == GOT_TLS_GD)
1899 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1900 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1901 || h->root.type != bfd_link_hash_undefweak)
1902 && (bfd_link_pic (info)
1903 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1904 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1905 }
1906 else
1907 h->got.offset = (bfd_vma) -1;
1908
1909 if (eh->dyn_relocs == NULL)
1910 return TRUE;
1911
1912 /* In the shared -Bsymbolic case, discard space allocated for
1913 dynamic pc-relative relocs against symbols which turn out to be
1914 defined in regular objects. For the normal shared case, discard
1915 space for pc-relative relocs that have become local due to symbol
1916 visibility changes. */
1917
1918 if (bfd_link_pic (info))
1919 {
1920 if (SYMBOL_CALLS_LOCAL (info, h))
1921 {
1922 struct elf_dyn_relocs **pp;
1923
1924 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1925 {
1926 p->count -= p->pc_count;
1927 p->pc_count = 0;
1928 if (p->count == 0)
1929 *pp = p->next;
1930 else
1931 pp = &p->next;
1932 }
1933 }
1934
1935 /* Also discard relocs on undefined weak syms with non-default
1936 visibility. */
1937 if (eh->dyn_relocs != NULL
1938 && h->root.type == bfd_link_hash_undefweak)
1939 {
1940 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1941 eh->dyn_relocs = NULL;
1942
1943 /* Make sure undefined weak symbols are output as a dynamic
1944 symbol in PIEs. */
1945 else if (h->dynindx == -1
1946 && !h->forced_local)
1947 {
1948 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1949 return FALSE;
1950 }
1951 }
1952 }
1953 else if (ELIMINATE_COPY_RELOCS)
1954 {
1955 /* For the non-shared case, discard space for relocs against
1956 symbols which turn out to need copy relocs or are not
1957 dynamic. */
1958
1959 if (!h->non_got_ref
1960 && ((h->def_dynamic
1961 && !h->def_regular)
1962 || (htab->elf.dynamic_sections_created
1963 && (h->root.type == bfd_link_hash_undefweak
1964 || h->root.type == bfd_link_hash_undefined))))
1965 {
1966 /* Make sure this symbol is output as a dynamic symbol.
1967 Undefined weak syms won't yet be marked as dynamic. */
1968 if (h->dynindx == -1
1969 && !h->forced_local)
1970 {
1971 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1972 return FALSE;
1973 }
1974
1975 /* If that succeeded, we know we'll be keeping all the
1976 relocs. */
1977 if (h->dynindx != -1)
1978 goto keep;
1979 }
1980
1981 eh->dyn_relocs = NULL;
1982
1983 keep: ;
1984 }
1985
1986 /* Finally, allocate space. */
1987 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1988 {
1989 asection *sreloc = elf_section_data (p->sec)->sreloc;
1990
1991 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1992 }
1993
1994 return TRUE;
1995 }
1996
1997 /* Find any dynamic relocs that apply to read-only sections. */
1998
1999 static bfd_boolean
2000 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2001 {
2002 struct elf_s390_link_hash_entry *eh;
2003 struct elf_dyn_relocs *p;
2004
2005 eh = (struct elf_s390_link_hash_entry *) h;
2006 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2007 {
2008 asection *s = p->sec->output_section;
2009
2010 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2011 {
2012 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2013
2014 info->flags |= DF_TEXTREL;
2015
2016 /* Not an error, just cut short the traversal. */
2017 return FALSE;
2018 }
2019 }
2020 return TRUE;
2021 }
2022
2023 /* Set the sizes of the dynamic sections. */
2024
2025 static bfd_boolean
2026 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2027 struct bfd_link_info *info)
2028 {
2029 struct elf_s390_link_hash_table *htab;
2030 bfd *dynobj;
2031 asection *s;
2032 bfd_boolean relocs;
2033 bfd *ibfd;
2034
2035 htab = elf_s390_hash_table (info);
2036 dynobj = htab->elf.dynobj;
2037 if (dynobj == NULL)
2038 abort ();
2039
2040 if (htab->elf.dynamic_sections_created)
2041 {
2042 /* Set the contents of the .interp section to the interpreter. */
2043 if (bfd_link_executable (info) && !info->nointerp)
2044 {
2045 s = bfd_get_linker_section (dynobj, ".interp");
2046 if (s == NULL)
2047 abort ();
2048 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2049 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2050 }
2051 }
2052
2053 /* Set up .got offsets for local syms, and space for local dynamic
2054 relocs. */
2055 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2056 {
2057 bfd_signed_vma *local_got;
2058 bfd_signed_vma *end_local_got;
2059 char *local_tls_type;
2060 bfd_size_type locsymcount;
2061 Elf_Internal_Shdr *symtab_hdr;
2062 asection *srela;
2063 struct plt_entry *local_plt;
2064 unsigned int i;
2065
2066 if (! is_s390_elf (ibfd))
2067 continue;
2068
2069 for (s = ibfd->sections; s != NULL; s = s->next)
2070 {
2071 struct elf_dyn_relocs *p;
2072
2073 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2074 {
2075 if (!bfd_is_abs_section (p->sec)
2076 && bfd_is_abs_section (p->sec->output_section))
2077 {
2078 /* Input section has been discarded, either because
2079 it is a copy of a linkonce section or due to
2080 linker script /DISCARD/, so we'll be discarding
2081 the relocs too. */
2082 }
2083 else if (p->count != 0)
2084 {
2085 srela = elf_section_data (p->sec)->sreloc;
2086 srela->size += p->count * sizeof (Elf32_External_Rela);
2087 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2088 info->flags |= DF_TEXTREL;
2089 }
2090 }
2091 }
2092
2093 local_got = elf_local_got_refcounts (ibfd);
2094 if (!local_got)
2095 continue;
2096
2097 symtab_hdr = &elf_symtab_hdr (ibfd);
2098 locsymcount = symtab_hdr->sh_info;
2099 end_local_got = local_got + locsymcount;
2100 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2101 s = htab->elf.sgot;
2102 srela = htab->elf.srelgot;
2103 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2104 {
2105 if (*local_got > 0)
2106 {
2107 *local_got = s->size;
2108 s->size += GOT_ENTRY_SIZE;
2109 if (*local_tls_type == GOT_TLS_GD)
2110 s->size += GOT_ENTRY_SIZE;
2111 if (bfd_link_pic (info))
2112 srela->size += sizeof (Elf32_External_Rela);
2113 }
2114 else
2115 *local_got = (bfd_vma) -1;
2116 }
2117 local_plt = elf_s390_local_plt (ibfd);
2118 for (i = 0; i < symtab_hdr->sh_info; i++)
2119 {
2120 if (local_plt[i].plt.refcount > 0)
2121 {
2122 local_plt[i].plt.offset = htab->elf.iplt->size;
2123 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2124 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2125 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
2126 }
2127 else
2128 local_plt[i].plt.offset = (bfd_vma) -1;
2129 }
2130 }
2131
2132 if (htab->tls_ldm_got.refcount > 0)
2133 {
2134 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2135 relocs. */
2136 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2137 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2138 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
2139 }
2140 else
2141 htab->tls_ldm_got.offset = -1;
2142
2143 /* Allocate global sym .plt and .got entries, and space for global
2144 sym dynamic relocs. */
2145 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2146
2147 /* We now have determined the sizes of the various dynamic sections.
2148 Allocate memory for them. */
2149 relocs = FALSE;
2150 for (s = dynobj->sections; s != NULL; s = s->next)
2151 {
2152 if ((s->flags & SEC_LINKER_CREATED) == 0)
2153 continue;
2154
2155 if (s == htab->elf.splt
2156 || s == htab->elf.sgot
2157 || s == htab->elf.sgotplt
2158 || s == htab->sdynbss
2159 || s == htab->elf.iplt
2160 || s == htab->elf.igotplt
2161 || s == htab->irelifunc)
2162 {
2163 /* Strip this section if we don't need it; see the
2164 comment below. */
2165 }
2166 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2167 {
2168 if (s->size != 0)
2169 relocs = TRUE;
2170
2171 /* We use the reloc_count field as a counter if we need
2172 to copy relocs into the output file. */
2173 s->reloc_count = 0;
2174 }
2175 else
2176 {
2177 /* It's not one of our sections, so don't allocate space. */
2178 continue;
2179 }
2180
2181 if (s->size == 0)
2182 {
2183 /* If we don't need this section, strip it from the
2184 output file. This is to handle .rela.bss and
2185 .rela.plt. We must create it in
2186 create_dynamic_sections, because it must be created
2187 before the linker maps input sections to output
2188 sections. The linker does that before
2189 adjust_dynamic_symbol is called, and it is that
2190 function which decides whether anything needs to go
2191 into these sections. */
2192
2193 s->flags |= SEC_EXCLUDE;
2194 continue;
2195 }
2196
2197 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2198 continue;
2199
2200 /* Allocate memory for the section contents. We use bfd_zalloc
2201 here in case unused entries are not reclaimed before the
2202 section's contents are written out. This should not happen,
2203 but this way if it does, we get a R_390_NONE reloc instead
2204 of garbage. */
2205 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2206 if (s->contents == NULL)
2207 return FALSE;
2208 }
2209
2210 if (htab->elf.dynamic_sections_created)
2211 {
2212 /* Add some entries to the .dynamic section. We fill in the
2213 values later, in elf_s390_finish_dynamic_sections, but we
2214 must add the entries now so that we get the correct size for
2215 the .dynamic section. The DT_DEBUG entry is filled in by the
2216 dynamic linker and used by the debugger. */
2217 #define add_dynamic_entry(TAG, VAL) \
2218 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2219
2220 if (bfd_link_executable (info))
2221 {
2222 if (!add_dynamic_entry (DT_DEBUG, 0))
2223 return FALSE;
2224 }
2225
2226 if (htab->elf.splt->size != 0)
2227 {
2228 if (!add_dynamic_entry (DT_PLTGOT, 0)
2229 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2230 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2231 || !add_dynamic_entry (DT_JMPREL, 0))
2232 return FALSE;
2233 }
2234
2235 if (relocs)
2236 {
2237 if (!add_dynamic_entry (DT_RELA, 0)
2238 || !add_dynamic_entry (DT_RELASZ, 0)
2239 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2240 return FALSE;
2241
2242 /* If any dynamic relocs apply to a read-only section,
2243 then we need a DT_TEXTREL entry. */
2244 if ((info->flags & DF_TEXTREL) == 0)
2245 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
2246
2247 if ((info->flags & DF_TEXTREL) != 0)
2248 {
2249 if (!add_dynamic_entry (DT_TEXTREL, 0))
2250 return FALSE;
2251 }
2252 }
2253 }
2254 #undef add_dynamic_entry
2255
2256 return TRUE;
2257 }
2258
2259 /* Return the base VMA address which should be subtracted from real addresses
2260 when resolving @dtpoff relocation.
2261 This is PT_TLS segment p_vaddr. */
2262
2263 static bfd_vma
2264 dtpoff_base (struct bfd_link_info *info)
2265 {
2266 /* If tls_sec is NULL, we should have signalled an error already. */
2267 if (elf_hash_table (info)->tls_sec == NULL)
2268 return 0;
2269 return elf_hash_table (info)->tls_sec->vma;
2270 }
2271
2272 /* Return the relocation value for @tpoff relocation
2273 if STT_TLS virtual address is ADDRESS. */
2274
2275 static bfd_vma
2276 tpoff (struct bfd_link_info *info, bfd_vma address)
2277 {
2278 struct elf_link_hash_table *htab = elf_hash_table (info);
2279
2280 /* If tls_sec is NULL, we should have signalled an error already. */
2281 if (htab->tls_sec == NULL)
2282 return 0;
2283 return htab->tls_size + htab->tls_sec->vma - address;
2284 }
2285
2286 /* Complain if TLS instruction relocation is against an invalid
2287 instruction. */
2288
2289 static void
2290 invalid_tls_insn (bfd *input_bfd,
2291 asection *input_section,
2292 Elf_Internal_Rela *rel)
2293 {
2294 reloc_howto_type *howto;
2295
2296 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2297 (*_bfd_error_handler)
2298 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2299 input_bfd,
2300 input_section,
2301 (long) rel->r_offset,
2302 howto->name);
2303 bfd_set_error (bfd_error_bad_value);
2304 }
2305
2306 /* Relocate a 390 ELF section. */
2307
2308 static bfd_boolean
2309 elf_s390_relocate_section (bfd *output_bfd,
2310 struct bfd_link_info *info,
2311 bfd *input_bfd,
2312 asection *input_section,
2313 bfd_byte *contents,
2314 Elf_Internal_Rela *relocs,
2315 Elf_Internal_Sym *local_syms,
2316 asection **local_sections)
2317 {
2318 struct elf_s390_link_hash_table *htab;
2319 Elf_Internal_Shdr *symtab_hdr;
2320 struct elf_link_hash_entry **sym_hashes;
2321 bfd_vma *local_got_offsets;
2322 Elf_Internal_Rela *rel;
2323 Elf_Internal_Rela *relend;
2324
2325 BFD_ASSERT (is_s390_elf (input_bfd));
2326
2327 htab = elf_s390_hash_table (info);
2328 symtab_hdr = &elf_symtab_hdr (input_bfd);
2329 sym_hashes = elf_sym_hashes (input_bfd);
2330 local_got_offsets = elf_local_got_offsets (input_bfd);
2331
2332 rel = relocs;
2333 relend = relocs + input_section->reloc_count;
2334 for (; rel < relend; rel++)
2335 {
2336 unsigned int r_type;
2337 reloc_howto_type *howto;
2338 unsigned long r_symndx;
2339 struct elf_link_hash_entry *h;
2340 Elf_Internal_Sym *sym;
2341 asection *sec;
2342 bfd_vma off;
2343 bfd_vma relocation;
2344 bfd_boolean unresolved_reloc;
2345 bfd_reloc_status_type r;
2346 int tls_type;
2347 asection *base_got = htab->elf.sgot;
2348
2349 r_type = ELF32_R_TYPE (rel->r_info);
2350 if (r_type == (int) R_390_GNU_VTINHERIT
2351 || r_type == (int) R_390_GNU_VTENTRY)
2352 continue;
2353 if (r_type >= (int) R_390_max)
2354 {
2355 bfd_set_error (bfd_error_bad_value);
2356 return FALSE;
2357 }
2358
2359 howto = elf_howto_table + r_type;
2360 r_symndx = ELF32_R_SYM (rel->r_info);
2361
2362 h = NULL;
2363 sym = NULL;
2364 sec = NULL;
2365 unresolved_reloc = FALSE;
2366 if (r_symndx < symtab_hdr->sh_info)
2367 {
2368 sym = local_syms + r_symndx;
2369 sec = local_sections[r_symndx];
2370 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2371 {
2372 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2373 if (local_plt == NULL)
2374 return FALSE;
2375
2376 /* Address of the PLT slot. */
2377 relocation = (htab->elf.iplt->output_section->vma
2378 + htab->elf.iplt->output_offset
2379 + local_plt[r_symndx].plt.offset);
2380
2381 switch (r_type)
2382 {
2383 case R_390_PLTOFF16:
2384 case R_390_PLTOFF32:
2385 relocation -= htab->elf.sgot->output_section->vma;
2386 break;
2387 case R_390_GOTPLT12:
2388 case R_390_GOTPLT16:
2389 case R_390_GOTPLT20:
2390 case R_390_GOTPLT32:
2391 case R_390_GOTPLTENT:
2392 case R_390_GOT12:
2393 case R_390_GOT16:
2394 case R_390_GOT20:
2395 case R_390_GOT32:
2396 case R_390_GOTENT:
2397 {
2398 /* Write the PLT slot address into the GOT slot. */
2399 bfd_put_32 (output_bfd, relocation,
2400 htab->elf.sgot->contents +
2401 local_got_offsets[r_symndx]);
2402 relocation = (local_got_offsets[r_symndx] +
2403 htab->elf.sgot->output_offset);
2404
2405 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2406 relocation += htab->elf.sgot->output_section->vma;
2407 break;
2408 }
2409 default:
2410 break;
2411 }
2412 /* The output section is needed later in
2413 finish_dynamic_section when creating the dynamic
2414 relocation. */
2415 local_plt[r_symndx].sec = sec;
2416 goto do_relocation;
2417 }
2418 else
2419 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2420 }
2421 else
2422 {
2423 bfd_boolean warned ATTRIBUTE_UNUSED;
2424 bfd_boolean ignored ATTRIBUTE_UNUSED;
2425
2426 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2427 r_symndx, symtab_hdr, sym_hashes,
2428 h, sec, relocation,
2429 unresolved_reloc, warned, ignored);
2430 }
2431
2432 if (sec != NULL && discarded_section (sec))
2433 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2434 rel, 1, relend, howto, 0, contents);
2435
2436 if (bfd_link_relocatable (info))
2437 continue;
2438
2439 switch (r_type)
2440 {
2441 case R_390_GOTPLT12:
2442 case R_390_GOTPLT16:
2443 case R_390_GOTPLT20:
2444 case R_390_GOTPLT32:
2445 case R_390_GOTPLTENT:
2446 /* There are three cases for a GOTPLT relocation. 1) The
2447 relocation is against the jump slot entry of a plt that
2448 will get emitted to the output file. 2) The relocation
2449 is against the jump slot of a plt entry that has been
2450 removed. elf_s390_adjust_gotplt has created a GOT entry
2451 as replacement. 3) The relocation is against a local symbol.
2452 Cases 2) and 3) are the same as the GOT relocation code
2453 so we just have to test for case 1 and fall through for
2454 the other two. */
2455 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2456 {
2457 bfd_vma plt_index;
2458
2459 if (s390_is_ifunc_symbol_p (h))
2460 {
2461 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2462 relocation = (plt_index * GOT_ENTRY_SIZE +
2463 htab->elf.igotplt->output_offset);
2464 if (r_type == R_390_GOTPLTENT)
2465 relocation += htab->elf.igotplt->output_section->vma;
2466 }
2467 else
2468 {
2469 /* Calc. index no.
2470 Current offset - size first entry / entry size. */
2471 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2472 PLT_ENTRY_SIZE;
2473
2474 /* Offset in GOT is PLT index plus GOT headers(3)
2475 times 4, addr & GOT addr. */
2476 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2477 if (r_type == R_390_GOTPLTENT)
2478 relocation += htab->elf.sgot->output_section->vma;
2479 }
2480 unresolved_reloc = FALSE;
2481
2482 }
2483 /* Fall through. */
2484
2485 case R_390_GOT12:
2486 case R_390_GOT16:
2487 case R_390_GOT20:
2488 case R_390_GOT32:
2489 case R_390_GOTENT:
2490 /* Relocation is to the entry for this symbol in the global
2491 offset table. */
2492 if (base_got == NULL)
2493 abort ();
2494
2495 if (h != NULL)
2496 {
2497 bfd_boolean dyn;
2498
2499 off = h->got.offset;
2500 dyn = htab->elf.dynamic_sections_created;
2501
2502 if (s390_is_ifunc_symbol_p (h))
2503 {
2504 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2505 if (off == (bfd_vma)-1)
2506 {
2507 /* No explicit GOT usage so redirect to the
2508 got.iplt slot. */
2509 base_got = htab->elf.igotplt;
2510 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2511 }
2512 else
2513 {
2514 /* Explicit GOT slots must contain the address
2515 of the PLT slot. This will be handled in
2516 finish_dynamic_symbol. */
2517 }
2518 }
2519 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2520 bfd_link_pic (info),
2521 h)
2522 || (bfd_link_pic (info)
2523 && SYMBOL_REFERENCES_LOCAL (info, h))
2524 || (ELF_ST_VISIBILITY (h->other)
2525 && h->root.type == bfd_link_hash_undefweak))
2526
2527 {
2528 /* This is actually a static link, or it is a
2529 -Bsymbolic link and the symbol is defined
2530 locally, or the symbol was forced to be local
2531 because of a version file. We must initialize
2532 this entry in the global offset table. Since the
2533 offset must always be a multiple of 2, we use the
2534 least significant bit to record whether we have
2535 initialized it already.
2536
2537 When doing a dynamic link, we create a .rel.got
2538 relocation entry to initialize the value. This
2539 is done in the finish_dynamic_symbol routine. */
2540 if ((off & 1) != 0)
2541 off &= ~1;
2542 else
2543 {
2544 bfd_put_32 (output_bfd, relocation,
2545 base_got->contents + off);
2546 h->got.offset |= 1;
2547 }
2548
2549 if ((h->def_regular
2550 && bfd_link_pic (info)
2551 && SYMBOL_REFERENCES_LOCAL (info, h))
2552 /* lrl rx,sym@GOTENT -> larl rx, sym */
2553 && ((r_type == R_390_GOTENT
2554 && (bfd_get_16 (input_bfd,
2555 contents + rel->r_offset - 2)
2556 & 0xff0f) == 0xc40d)
2557 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2558 || (r_type == R_390_GOT20
2559 && (bfd_get_32 (input_bfd,
2560 contents + rel->r_offset - 2)
2561 & 0xff00f000) == 0xe300c000
2562 && bfd_get_8 (input_bfd,
2563 contents + rel->r_offset + 3) == 0x58)))
2564 {
2565 unsigned short new_insn =
2566 (0xc000 | (bfd_get_8 (input_bfd,
2567 contents + rel->r_offset - 1) & 0xf0));
2568 bfd_put_16 (output_bfd, new_insn,
2569 contents + rel->r_offset - 2);
2570 r_type = R_390_PC32DBL;
2571 rel->r_addend = 2;
2572 howto = elf_howto_table + r_type;
2573 relocation = h->root.u.def.value
2574 + h->root.u.def.section->output_section->vma
2575 + h->root.u.def.section->output_offset;
2576 goto do_relocation;
2577 }
2578 }
2579 else
2580 unresolved_reloc = FALSE;
2581 }
2582 else
2583 {
2584 if (local_got_offsets == NULL)
2585 abort ();
2586
2587 off = local_got_offsets[r_symndx];
2588
2589 /* The offset must always be a multiple of 4. We use
2590 the least significant bit to record whether we have
2591 already generated the necessary reloc. */
2592 if ((off & 1) != 0)
2593 off &= ~1;
2594 else
2595 {
2596 bfd_put_32 (output_bfd, relocation,
2597 htab->elf.sgot->contents + off);
2598
2599 if (bfd_link_pic (info))
2600 {
2601 asection *srelgot;
2602 Elf_Internal_Rela outrel;
2603 bfd_byte *loc;
2604
2605 srelgot = htab->elf.srelgot;
2606 if (srelgot == NULL)
2607 abort ();
2608
2609 outrel.r_offset = (htab->elf.sgot->output_section->vma
2610 + htab->elf.sgot->output_offset
2611 + off);
2612 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2613 outrel.r_addend = relocation;
2614 loc = srelgot->contents;
2615 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2616 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2617 }
2618
2619 local_got_offsets[r_symndx] |= 1;
2620 }
2621 }
2622
2623 if (off >= (bfd_vma) -2)
2624 abort ();
2625
2626 relocation = base_got->output_offset + off;
2627
2628 /* For @GOTENT the relocation is against the offset between
2629 the instruction and the symbols entry in the GOT and not
2630 between the start of the GOT and the symbols entry. We
2631 add the vma of the GOT to get the correct value. */
2632 if ( r_type == R_390_GOTENT
2633 || r_type == R_390_GOTPLTENT)
2634 relocation += base_got->output_section->vma;
2635
2636 break;
2637
2638 case R_390_GOTOFF16:
2639 case R_390_GOTOFF32:
2640 /* Relocation is relative to the start of the global offset
2641 table. */
2642
2643 /* Note that sgot->output_offset is not involved in this
2644 calculation. We always want the start of .got. If we
2645 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2646 permitted by the ABI, we might have to change this
2647 calculation. */
2648 relocation -= htab->elf.sgot->output_section->vma;
2649 break;
2650
2651 case R_390_GOTPC:
2652 case R_390_GOTPCDBL:
2653 /* Use global offset table as symbol value. */
2654 relocation = htab->elf.sgot->output_section->vma;
2655 unresolved_reloc = FALSE;
2656 break;
2657
2658 case R_390_PLT12DBL:
2659 case R_390_PLT16DBL:
2660 case R_390_PLT24DBL:
2661 case R_390_PLT32DBL:
2662 case R_390_PLT32:
2663 /* Relocation is to the entry for this symbol in the
2664 procedure linkage table. */
2665
2666 /* Resolve a PLT32 reloc against a local symbol directly,
2667 without using the procedure linkage table. */
2668 if (h == NULL)
2669 break;
2670
2671 if (h->plt.offset == (bfd_vma) -1
2672 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2673 {
2674 /* We didn't make a PLT entry for this symbol. This
2675 happens when statically linking PIC code, or when
2676 using -Bsymbolic. */
2677 break;
2678 }
2679
2680 if (s390_is_ifunc_symbol_p (h))
2681 relocation = (htab->elf.iplt->output_section->vma
2682 + htab->elf.iplt->output_offset
2683 + h->plt.offset);
2684 else
2685 relocation = (htab->elf.splt->output_section->vma
2686 + htab->elf.splt->output_offset
2687 + h->plt.offset);
2688 unresolved_reloc = FALSE;
2689 break;
2690
2691 case R_390_PLTOFF16:
2692 case R_390_PLTOFF32:
2693 /* Relocation is to the entry for this symbol in the
2694 procedure linkage table relative to the start of the GOT. */
2695
2696 /* For local symbols or if we didn't make a PLT entry for
2697 this symbol resolve the symbol directly. */
2698 if (h == NULL
2699 || h->plt.offset == (bfd_vma) -1
2700 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2701 {
2702 relocation -= htab->elf.sgot->output_section->vma;
2703 break;
2704 }
2705
2706 if (s390_is_ifunc_symbol_p (h))
2707 relocation = (htab->elf.iplt->output_section->vma
2708 + htab->elf.iplt->output_offset
2709 + h->plt.offset
2710 - htab->elf.sgot->output_section->vma);
2711 else
2712 relocation = (htab->elf.splt->output_section->vma
2713 + htab->elf.splt->output_offset
2714 + h->plt.offset
2715 - htab->elf.sgot->output_section->vma);
2716 unresolved_reloc = FALSE;
2717 break;
2718
2719 case R_390_8:
2720 case R_390_16:
2721 case R_390_32:
2722 case R_390_PC16:
2723 case R_390_PC12DBL:
2724 case R_390_PC16DBL:
2725 case R_390_PC24DBL:
2726 case R_390_PC32DBL:
2727 case R_390_PC32:
2728 if (h != NULL
2729 && s390_is_ifunc_symbol_p (h)
2730 && h->def_regular)
2731 {
2732 if (!bfd_link_pic (info) || !h->non_got_ref)
2733 {
2734 /* For a non-shared object STT_GNU_IFUNC symbol must
2735 go through PLT. */
2736 relocation = (htab->elf.iplt->output_section->vma
2737 + htab->elf.iplt->output_offset
2738 + h ->plt.offset);
2739 goto do_relocation;
2740 }
2741 else
2742 {
2743 /* For shared objects a runtime relocation is needed. */
2744
2745 Elf_Internal_Rela outrel;
2746 asection *sreloc;
2747
2748 /* Need a dynamic relocation to get the real function
2749 address. */
2750 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2751 info,
2752 input_section,
2753 rel->r_offset);
2754 if (outrel.r_offset == (bfd_vma) -1
2755 || outrel.r_offset == (bfd_vma) -2)
2756 abort ();
2757
2758 outrel.r_offset += (input_section->output_section->vma
2759 + input_section->output_offset);
2760
2761 if (h->dynindx == -1
2762 || h->forced_local
2763 || bfd_link_executable (info))
2764 {
2765 /* This symbol is resolved locally. */
2766 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2767 outrel.r_addend = (h->root.u.def.value
2768 + h->root.u.def.section->output_section->vma
2769 + h->root.u.def.section->output_offset);
2770 }
2771 else
2772 {
2773 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2774 outrel.r_addend = 0;
2775 }
2776
2777 sreloc = htab->elf.irelifunc;
2778 elf_append_rela (output_bfd, sreloc, &outrel);
2779
2780 /* If this reloc is against an external symbol, we
2781 do not want to fiddle with the addend. Otherwise,
2782 we need to include the symbol value so that it
2783 becomes an addend for the dynamic reloc. For an
2784 internal symbol, we have updated addend. */
2785 continue;
2786 }
2787 }
2788
2789 if ((input_section->flags & SEC_ALLOC) == 0)
2790 break;
2791
2792 if ((bfd_link_pic (info)
2793 && (h == NULL
2794 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2795 || h->root.type != bfd_link_hash_undefweak)
2796 && ((r_type != R_390_PC16
2797 && r_type != R_390_PC12DBL
2798 && r_type != R_390_PC16DBL
2799 && r_type != R_390_PC24DBL
2800 && r_type != R_390_PC32DBL
2801 && r_type != R_390_PC32)
2802 || !SYMBOL_CALLS_LOCAL (info, h)))
2803 || (ELIMINATE_COPY_RELOCS
2804 && !bfd_link_pic (info)
2805 && h != NULL
2806 && h->dynindx != -1
2807 && !h->non_got_ref
2808 && ((h->def_dynamic
2809 && !h->def_regular)
2810 || h->root.type == bfd_link_hash_undefweak
2811 || h->root.type == bfd_link_hash_undefined)))
2812 {
2813 Elf_Internal_Rela outrel;
2814 bfd_boolean skip, relocate;
2815 asection *sreloc;
2816 bfd_byte *loc;
2817
2818 /* When generating a shared object, these relocations
2819 are copied into the output file to be resolved at run
2820 time. */
2821
2822 skip = FALSE;
2823 relocate = FALSE;
2824
2825 outrel.r_offset =
2826 _bfd_elf_section_offset (output_bfd, info, input_section,
2827 rel->r_offset);
2828 if (outrel.r_offset == (bfd_vma) -1)
2829 skip = TRUE;
2830 else if (outrel.r_offset == (bfd_vma) -2)
2831 skip = TRUE, relocate = TRUE;
2832 outrel.r_offset += (input_section->output_section->vma
2833 + input_section->output_offset);
2834
2835 if (skip)
2836 memset (&outrel, 0, sizeof outrel);
2837 else if (h != NULL
2838 && h->dynindx != -1
2839 && (r_type == R_390_PC16
2840 || r_type == R_390_PC12DBL
2841 || r_type == R_390_PC16DBL
2842 || r_type == R_390_PC24DBL
2843 || r_type == R_390_PC32DBL
2844 || r_type == R_390_PC32
2845 || !bfd_link_pic (info)
2846 || !SYMBOLIC_BIND (info, h)
2847 || !h->def_regular))
2848 {
2849 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2850 outrel.r_addend = rel->r_addend;
2851 }
2852 else
2853 {
2854 /* This symbol is local, or marked to become local. */
2855 outrel.r_addend = relocation + rel->r_addend;
2856 if (r_type == R_390_32)
2857 {
2858 relocate = TRUE;
2859 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2860 }
2861 else
2862 {
2863 long sindx;
2864
2865 if (bfd_is_abs_section (sec))
2866 sindx = 0;
2867 else if (sec == NULL || sec->owner == NULL)
2868 {
2869 bfd_set_error(bfd_error_bad_value);
2870 return FALSE;
2871 }
2872 else
2873 {
2874 asection *osec;
2875
2876 osec = sec->output_section;
2877 sindx = elf_section_data (osec)->dynindx;
2878 if (sindx == 0)
2879 {
2880 osec = htab->elf.text_index_section;
2881 sindx = elf_section_data (osec)->dynindx;
2882 }
2883 BFD_ASSERT (sindx != 0);
2884
2885 /* We are turning this relocation into one
2886 against a section symbol, so subtract out
2887 the output section's address but not the
2888 offset of the input section in the output
2889 section. */
2890 outrel.r_addend -= osec->vma;
2891 }
2892 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2893 }
2894 }
2895
2896 sreloc = elf_section_data (input_section)->sreloc;
2897 if (sreloc == NULL)
2898 abort ();
2899
2900 loc = sreloc->contents;
2901 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2902 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2903
2904 /* If this reloc is against an external symbol, we do
2905 not want to fiddle with the addend. Otherwise, we
2906 need to include the symbol value so that it becomes
2907 an addend for the dynamic reloc. */
2908 if (! relocate)
2909 continue;
2910 }
2911 break;
2912
2913 /* Relocations for tls literal pool entries. */
2914 case R_390_TLS_IE32:
2915 if (bfd_link_pic (info))
2916 {
2917 Elf_Internal_Rela outrel;
2918 asection *sreloc;
2919 bfd_byte *loc;
2920
2921 outrel.r_offset = rel->r_offset
2922 + input_section->output_section->vma
2923 + input_section->output_offset;
2924 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2925 sreloc = elf_section_data (input_section)->sreloc;
2926 if (sreloc == NULL)
2927 abort ();
2928 loc = sreloc->contents;
2929 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2930 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2931 }
2932 /* Fall through. */
2933
2934 case R_390_TLS_GD32:
2935 case R_390_TLS_GOTIE32:
2936 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2937 tls_type = GOT_UNKNOWN;
2938 if (h == NULL && local_got_offsets)
2939 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2940 else if (h != NULL)
2941 {
2942 tls_type = elf_s390_hash_entry(h)->tls_type;
2943 if (!bfd_link_pic (info)
2944 && h->dynindx == -1
2945 && tls_type >= GOT_TLS_IE)
2946 r_type = R_390_TLS_LE32;
2947 }
2948 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2949 r_type = R_390_TLS_IE32;
2950
2951 if (r_type == R_390_TLS_LE32)
2952 {
2953 /* This relocation gets optimized away by the local exec
2954 access optimization. */
2955 BFD_ASSERT (! unresolved_reloc);
2956 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2957 contents + rel->r_offset);
2958 continue;
2959 }
2960
2961 if (htab->elf.sgot == NULL)
2962 abort ();
2963
2964 if (h != NULL)
2965 off = h->got.offset;
2966 else
2967 {
2968 if (local_got_offsets == NULL)
2969 abort ();
2970
2971 off = local_got_offsets[r_symndx];
2972 }
2973
2974 emit_tls_relocs:
2975
2976 if ((off & 1) != 0)
2977 off &= ~1;
2978 else
2979 {
2980 Elf_Internal_Rela outrel;
2981 bfd_byte *loc;
2982 int dr_type, indx;
2983
2984 if (htab->elf.srelgot == NULL)
2985 abort ();
2986
2987 outrel.r_offset = (htab->elf.sgot->output_section->vma
2988 + htab->elf.sgot->output_offset + off);
2989
2990 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2991 if (r_type == R_390_TLS_GD32)
2992 dr_type = R_390_TLS_DTPMOD;
2993 else
2994 dr_type = R_390_TLS_TPOFF;
2995 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2996 outrel.r_addend = relocation - dtpoff_base (info);
2997 else
2998 outrel.r_addend = 0;
2999 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3000 loc = htab->elf.srelgot->contents;
3001 loc += htab->elf.srelgot->reloc_count++
3002 * sizeof (Elf32_External_Rela);
3003 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3004
3005 if (r_type == R_390_TLS_GD32)
3006 {
3007 if (indx == 0)
3008 {
3009 BFD_ASSERT (! unresolved_reloc);
3010 bfd_put_32 (output_bfd,
3011 relocation - dtpoff_base (info),
3012 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3013 }
3014 else
3015 {
3016 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
3017 outrel.r_offset += GOT_ENTRY_SIZE;
3018 outrel.r_addend = 0;
3019 htab->elf.srelgot->reloc_count++;
3020 loc += sizeof (Elf32_External_Rela);
3021 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3022 }
3023 }
3024
3025 if (h != NULL)
3026 h->got.offset |= 1;
3027 else
3028 local_got_offsets[r_symndx] |= 1;
3029 }
3030
3031 if (off >= (bfd_vma) -2)
3032 abort ();
3033 if (r_type == ELF32_R_TYPE (rel->r_info))
3034 {
3035 relocation = htab->elf.sgot->output_offset + off;
3036 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
3037 relocation += htab->elf.sgot->output_section->vma;
3038 unresolved_reloc = FALSE;
3039 }
3040 else
3041 {
3042 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
3043 contents + rel->r_offset);
3044 continue;
3045 }
3046 break;
3047
3048 case R_390_TLS_GOTIE12:
3049 case R_390_TLS_GOTIE20:
3050 case R_390_TLS_IEENT:
3051 if (h == NULL)
3052 {
3053 if (local_got_offsets == NULL)
3054 abort();
3055 off = local_got_offsets[r_symndx];
3056 if (bfd_link_pic (info))
3057 goto emit_tls_relocs;
3058 }
3059 else
3060 {
3061 off = h->got.offset;
3062 tls_type = elf_s390_hash_entry(h)->tls_type;
3063 if (bfd_link_pic (info)
3064 || h->dynindx != -1
3065 || tls_type < GOT_TLS_IE)
3066 goto emit_tls_relocs;
3067 }
3068
3069 if (htab->elf.sgot == NULL)
3070 abort ();
3071
3072 BFD_ASSERT (! unresolved_reloc);
3073 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3074 htab->elf.sgot->contents + off);
3075 relocation = htab->elf.sgot->output_offset + off;
3076 if (r_type == R_390_TLS_IEENT)
3077 relocation += htab->elf.sgot->output_section->vma;
3078 unresolved_reloc = FALSE;
3079 break;
3080
3081 case R_390_TLS_LDM32:
3082 if (! bfd_link_pic (info))
3083 /* The literal pool entry this relocation refers to gets ignored
3084 by the optimized code of the local exec model. Do nothing
3085 and the value will turn out zero. */
3086 continue;
3087
3088 if (htab->elf.sgot == NULL)
3089 abort ();
3090
3091 off = htab->tls_ldm_got.offset;
3092 if (off & 1)
3093 off &= ~1;
3094 else
3095 {
3096 Elf_Internal_Rela outrel;
3097 bfd_byte *loc;
3098
3099 if (htab->elf.srelgot == NULL)
3100 abort ();
3101
3102 outrel.r_offset = (htab->elf.sgot->output_section->vma
3103 + htab->elf.sgot->output_offset + off);
3104
3105 bfd_put_32 (output_bfd, 0,
3106 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3107 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
3108 outrel.r_addend = 0;
3109 loc = htab->elf.srelgot->contents;
3110 loc += htab->elf.srelgot->reloc_count++
3111 * sizeof (Elf32_External_Rela);
3112 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3113 htab->tls_ldm_got.offset |= 1;
3114 }
3115 relocation = htab->elf.sgot->output_offset + off;
3116 unresolved_reloc = FALSE;
3117 break;
3118
3119 case R_390_TLS_LE32:
3120 if (bfd_link_dll (info))
3121 {
3122 /* Linking a shared library with non-fpic code requires
3123 a R_390_TLS_TPOFF relocation. */
3124 Elf_Internal_Rela outrel;
3125 asection *sreloc;
3126 bfd_byte *loc;
3127 int indx;
3128
3129 outrel.r_offset = rel->r_offset
3130 + input_section->output_section->vma
3131 + input_section->output_offset;
3132 if (h != NULL && h->dynindx != -1)
3133 indx = h->dynindx;
3134 else
3135 indx = 0;
3136 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
3137 if (indx == 0)
3138 outrel.r_addend = relocation - dtpoff_base (info);
3139 else
3140 outrel.r_addend = 0;
3141 sreloc = elf_section_data (input_section)->sreloc;
3142 if (sreloc == NULL)
3143 abort ();
3144 loc = sreloc->contents;
3145 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3146 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3147 }
3148 else
3149 {
3150 BFD_ASSERT (! unresolved_reloc);
3151 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3152 contents + rel->r_offset);
3153 }
3154 continue;
3155
3156 case R_390_TLS_LDO32:
3157 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
3158 relocation -= dtpoff_base (info);
3159 else
3160 /* When converting LDO to LE, we must negate. */
3161 relocation = -tpoff (info, relocation);
3162 break;
3163
3164 /* Relocations for tls instructions. */
3165 case R_390_TLS_LOAD:
3166 case R_390_TLS_GDCALL:
3167 case R_390_TLS_LDCALL:
3168 tls_type = GOT_UNKNOWN;
3169 if (h == NULL && local_got_offsets)
3170 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3171 else if (h != NULL)
3172 tls_type = elf_s390_hash_entry(h)->tls_type;
3173
3174 if (tls_type == GOT_TLS_GD)
3175 continue;
3176
3177 if (r_type == R_390_TLS_LOAD)
3178 {
3179 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3180 {
3181 /* IE->LE transition. Four valid cases:
3182 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
3183 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
3184 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
3185 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3186 unsigned int insn, ry;
3187
3188 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3189 ry = 0;
3190 if ((insn & 0xff00f000) == 0x58000000)
3191 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
3192 ry = (insn & 0x000f0000);
3193 else if ((insn & 0xff0f0000) == 0x58000000)
3194 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
3195 ry = (insn & 0x0000f000) << 4;
3196 else if ((insn & 0xff00f000) == 0x5800c000)
3197 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
3198 ry = (insn & 0x000f0000);
3199 else if ((insn & 0xff0f0000) == 0x580c0000)
3200 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3201 ry = (insn & 0x0000f000) << 4;
3202 else
3203 invalid_tls_insn (input_bfd, input_section, rel);
3204 insn = 0x18000700 | (insn & 0x00f00000) | ry;
3205 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3206 }
3207 }
3208 else if (r_type == R_390_TLS_GDCALL)
3209 {
3210 unsigned int insn;
3211
3212 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3213 if ((insn & 0xff000fff) != 0x4d000000 &&
3214 (insn & 0xffff0000) != 0xc0e50000 &&
3215 (insn & 0xff000000) != 0x0d000000)
3216 invalid_tls_insn (input_bfd, input_section, rel);
3217 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3218 {
3219 if ((insn & 0xff000000) == 0x0d000000)
3220 {
3221 /* GD->LE transition.
3222 basr rx, ry -> nopr r7 */
3223 insn = 0x07070000 | (insn & 0xffff);
3224 }
3225 else if ((insn & 0xff000000) == 0x4d000000)
3226 {
3227 /* GD->LE transition.
3228 bas %r14,0(%rx,%r13) -> bc 0,0 */
3229 insn = 0x47000000;
3230 }
3231 else
3232 {
3233 /* GD->LE transition.
3234 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
3235 insn = 0xc0040000;
3236 bfd_put_16 (output_bfd, 0x0000,
3237 contents + rel->r_offset + 4);
3238 }
3239 }
3240 else
3241 {
3242 /* If basr is used in the pic case to invoke
3243 _tls_get_offset, something went wrong before. */
3244 if ((insn & 0xff000000) == 0x0d000000)
3245 invalid_tls_insn (input_bfd, input_section, rel);
3246
3247 if ((insn & 0xff000000) == 0x4d000000)
3248 {
3249 /* GD->IE transition.
3250 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3251 insn = 0x5822c000;
3252 }
3253 else
3254 {
3255 /* GD->IE transition.
3256 brasl %r14,__tls_get_addr@plt ->
3257 l %r2,0(%r2,%r12) ; bcr 0,0 */
3258 insn = 0x5822c000;
3259 bfd_put_16 (output_bfd, 0x0700,
3260 contents + rel->r_offset + 4);
3261 }
3262 }
3263 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3264 }
3265 else if (r_type == R_390_TLS_LDCALL)
3266 {
3267 if (!bfd_link_pic (info))
3268 {
3269 unsigned int insn;
3270
3271 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3272 if ((insn & 0xff000fff) != 0x4d000000 &&
3273 (insn & 0xffff0000) != 0xc0e50000 &&
3274 (insn & 0xff000000) != 0x0d000000)
3275 invalid_tls_insn (input_bfd, input_section, rel);
3276
3277 if ((insn & 0xff000000) == 0x0d000000)
3278 {
3279 /* LD->LE transition.
3280 basr rx, ry -> nopr r7 */
3281 insn = 0x07070000 | (insn & 0xffff);
3282 }
3283 else if ((insn & 0xff000000) == 0x4d000000)
3284 {
3285 /* LD->LE transition.
3286 bas %r14,0(%rx,%r13) -> bc 0,0 */
3287 insn = 0x47000000;
3288 }
3289 else
3290 {
3291 /* LD->LE transition.
3292 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3293 insn = 0xc0040000;
3294 bfd_put_16 (output_bfd, 0x0000,
3295 contents + rel->r_offset + 4);
3296 }
3297 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3298 }
3299 }
3300 continue;
3301
3302 default:
3303 break;
3304 }
3305
3306 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3307 because such sections are not SEC_ALLOC and thus ld.so will
3308 not process them. */
3309 if (unresolved_reloc
3310 && !((input_section->flags & SEC_DEBUGGING) != 0
3311 && h->def_dynamic)
3312 && _bfd_elf_section_offset (output_bfd, info, input_section,
3313 rel->r_offset) != (bfd_vma) -1)
3314 (*_bfd_error_handler)
3315 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3316 input_bfd,
3317 input_section,
3318 (long) rel->r_offset,
3319 howto->name,
3320 h->root.root.string);
3321
3322 do_relocation:
3323
3324 /* When applying a 24 bit reloc we need to start one byte
3325 earlier. Otherwise the 32 bit get/put bfd operations might
3326 access a byte after the actual section. */
3327 if (r_type == R_390_PC24DBL
3328 || r_type == R_390_PLT24DBL)
3329 rel->r_offset--;
3330
3331 if (r_type == R_390_20
3332 || r_type == R_390_GOT20
3333 || r_type == R_390_GOTPLT20
3334 || r_type == R_390_TLS_GOTIE20)
3335 {
3336 relocation += rel->r_addend;
3337 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3338 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3339 contents, rel->r_offset,
3340 relocation, 0);
3341 }
3342 else
3343 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3344 contents, rel->r_offset,
3345 relocation, rel->r_addend);
3346
3347 if (r != bfd_reloc_ok)
3348 {
3349 const char *name;
3350
3351 if (h != NULL)
3352 name = h->root.root.string;
3353 else
3354 {
3355 name = bfd_elf_string_from_elf_section (input_bfd,
3356 symtab_hdr->sh_link,
3357 sym->st_name);
3358 if (name == NULL)
3359 return FALSE;
3360 if (*name == '\0')
3361 name = bfd_section_name (input_bfd, sec);
3362 }
3363
3364 if (r == bfd_reloc_overflow)
3365 {
3366
3367 if (! ((*info->callbacks->reloc_overflow)
3368 (info, (h ? &h->root : NULL), name, howto->name,
3369 (bfd_vma) 0, input_bfd, input_section,
3370 rel->r_offset)))
3371 return FALSE;
3372 }
3373 else
3374 {
3375 (*_bfd_error_handler)
3376 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3377 input_bfd, input_section,
3378 (long) rel->r_offset, name, (int) r);
3379 return FALSE;
3380 }
3381 }
3382 }
3383
3384 return TRUE;
3385 }
3386
3387 /* Generate the PLT slots together with the dynamic relocations needed
3388 for IFUNC symbols. */
3389
3390 static void
3391 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3392 struct bfd_link_info *info,
3393 struct elf_link_hash_entry *h,
3394 struct elf_s390_link_hash_table *htab,
3395 bfd_vma iplt_offset,
3396 bfd_vma resolver_address)
3397 {
3398 bfd_vma iplt_index;
3399 bfd_vma got_offset;
3400 bfd_vma igotiplt_offset;
3401 Elf_Internal_Rela rela;
3402 bfd_byte *loc;
3403 asection *plt, *gotplt, *relplt;
3404 bfd_vma relative_offset;
3405
3406 if (htab->elf.iplt == NULL
3407 || htab->elf.igotplt == NULL
3408 || htab->elf.irelplt == NULL)
3409 abort ();
3410
3411 gotplt = htab->elf.igotplt;
3412 relplt = htab->elf.irelplt;
3413
3414 /* Index of the PLT slot within iplt section. */
3415 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3416 plt = htab->elf.iplt;
3417 /* Offset into the igot.plt section. */
3418 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3419 /* Offset into the got section. */
3420 got_offset = igotiplt_offset + gotplt->output_offset;
3421
3422 /* S390 uses halfwords for relative branch calc! */
3423 relative_offset = - (plt->output_offset +
3424 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3425 /* If offset is > 32768, branch to a previous branch
3426 390 can only handle +-64 K jumps. */
3427 if ( -32768 > (int) relative_offset )
3428 relative_offset
3429 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3430
3431 /* Fill in the entry in the procedure linkage table. */
3432 if (!bfd_link_pic (info))
3433 {
3434 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3435 PLT_ENTRY_SIZE);
3436
3437 /* Adjust jump to the first plt entry. */
3438 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3439 plt->contents + iplt_offset + 20);
3440
3441 /* Push the GOT offset field. */
3442 bfd_put_32 (output_bfd,
3443 (gotplt->output_section->vma
3444 + got_offset),
3445 plt->contents + iplt_offset + 24);
3446 }
3447 else if (got_offset < 4096)
3448 {
3449 /* The GOT offset is small enough to be used directly as
3450 displacement. */
3451 memcpy (plt->contents + iplt_offset,
3452 elf_s390_plt_pic12_entry,
3453 PLT_ENTRY_SIZE);
3454
3455 /* Put in the GOT offset as displacement value. The 0xc000
3456 value comes from the first word of the plt entry. Look
3457 at the elf_s390_plt_pic16_entry content. */
3458 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3459 plt->contents + iplt_offset + 2);
3460
3461 /* Adjust the jump to the first plt entry. */
3462 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3463 plt->contents + iplt_offset + 20);
3464 }
3465 else if (got_offset < 32768)
3466 {
3467 /* The GOT offset is too big for a displacement but small
3468 enough to be a signed 16 bit immediate value as it can be
3469 used in an lhi instruction. */
3470 memcpy (plt->contents + iplt_offset,
3471 elf_s390_plt_pic16_entry,
3472 PLT_ENTRY_SIZE);
3473
3474 /* Put in the GOT offset for the lhi instruction. */
3475 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3476 plt->contents + iplt_offset + 2);
3477
3478 /* Adjust the jump to the first plt entry. */
3479 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3480 plt->contents + iplt_offset + 20);
3481 }
3482 else
3483 {
3484 memcpy (plt->contents + iplt_offset,
3485 elf_s390_plt_pic_entry,
3486 PLT_ENTRY_SIZE);
3487
3488 /* Adjust the jump to the first plt entry. */
3489 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3490 plt->contents + iplt_offset + 20);
3491
3492 /* Push the GOT offset field. */
3493 bfd_put_32 (output_bfd, got_offset,
3494 plt->contents + iplt_offset + 24);
3495 }
3496 /* Insert offset into reloc. table here. */
3497 bfd_put_32 (output_bfd, relplt->output_offset +
3498 iplt_index * RELA_ENTRY_SIZE,
3499 plt->contents + iplt_offset + 28);
3500
3501 /* Fill in the entry in the global offset table.
3502 Points to instruction after GOT offset. */
3503 bfd_put_32 (output_bfd,
3504 (plt->output_section->vma
3505 + plt->output_offset
3506 + iplt_offset
3507 + 12),
3508 gotplt->contents + igotiplt_offset);
3509
3510 /* Fill in the entry in the .rela.plt section. */
3511 rela.r_offset = gotplt->output_section->vma + got_offset;
3512
3513 if (!h
3514 || h->dynindx == -1
3515 || ((bfd_link_executable (info)
3516 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3517 && h->def_regular))
3518 {
3519 /* The symbol can be locally resolved. */
3520 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3521 rela.r_addend = resolver_address;
3522 }
3523 else
3524 {
3525 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3526 rela.r_addend = 0;
3527 }
3528
3529 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3530 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3531 }
3532
3533 /* Finish up dynamic symbol handling. We set the contents of various
3534 dynamic sections here. */
3535
3536 static bfd_boolean
3537 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3538 struct bfd_link_info *info,
3539 struct elf_link_hash_entry *h,
3540 Elf_Internal_Sym *sym)
3541 {
3542 struct elf_s390_link_hash_table *htab;
3543 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3544
3545 htab = elf_s390_hash_table (info);
3546
3547 if (h->plt.offset != (bfd_vma) -1)
3548 {
3549 bfd_vma plt_index;
3550 bfd_vma got_offset;
3551 Elf_Internal_Rela rela;
3552 bfd_byte *loc;
3553 bfd_vma relative_offset;
3554
3555 /* This symbol has an entry in the procedure linkage table. Set
3556 it up. */
3557 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3558 {
3559 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3560 htab, h->plt.offset,
3561 eh->ifunc_resolver_address +
3562 eh->ifunc_resolver_section->output_offset +
3563 eh->ifunc_resolver_section->output_section->vma);
3564 /* Do not return yet. Handling of explicit GOT slots of
3565 IFUNC symbols is below. */
3566 }
3567 else
3568 {
3569 if (h->dynindx == -1
3570 || htab->elf.splt == NULL
3571 || htab->elf.sgotplt == NULL
3572 || htab->elf.srelplt == NULL)
3573 abort ();
3574
3575 /* Calc. index no.
3576 Current offset - size first entry / entry size. */
3577 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3578
3579 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3580 addr & GOT addr. */
3581 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3582
3583 /* S390 uses halfwords for relative branch calc! */
3584 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3585 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3586 /* If offset is > 32768, branch to a previous branch
3587 390 can only handle +-64 K jumps. */
3588 if ( -32768 > (int) relative_offset )
3589 relative_offset
3590 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3591
3592 /* Fill in the entry in the procedure linkage table. */
3593 if (!bfd_link_pic (info))
3594 {
3595 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3596 PLT_ENTRY_SIZE);
3597
3598 /* Adjust jump to the first plt entry. */
3599 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3600 htab->elf.splt->contents + h->plt.offset + 20);
3601
3602 /* Push the GOT offset field. */
3603 bfd_put_32 (output_bfd,
3604 (htab->elf.sgotplt->output_section->vma
3605 + htab->elf.sgotplt->output_offset
3606 + got_offset),
3607 htab->elf.splt->contents + h->plt.offset + 24);
3608 }
3609 else if (got_offset < 4096)
3610 {
3611 /* The GOT offset is small enough to be used directly as
3612 displacement. */
3613 memcpy (htab->elf.splt->contents + h->plt.offset,
3614 elf_s390_plt_pic12_entry,
3615 PLT_ENTRY_SIZE);
3616
3617 /* Put in the GOT offset as displacement value. The 0xc000
3618 value comes from the first word of the plt entry. Look
3619 at the elf_s390_plt_pic16_entry content. */
3620 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3621 htab->elf.splt->contents + h->plt.offset + 2);
3622
3623 /* Adjust the jump to the first plt entry. */
3624 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3625 htab->elf.splt->contents + h->plt.offset + 20);
3626 }
3627 else if (got_offset < 32768)
3628 {
3629 /* The GOT offset is too big for a displacement but small
3630 enough to be a signed 16 bit immediate value as it can be
3631 used in an lhi instruction. */
3632 memcpy (htab->elf.splt->contents + h->plt.offset,
3633 elf_s390_plt_pic16_entry,
3634 PLT_ENTRY_SIZE);
3635
3636 /* Put in the GOT offset for the lhi instruction. */
3637 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3638 htab->elf.splt->contents + h->plt.offset + 2);
3639
3640 /* Adjust the jump to the first plt entry. */
3641 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3642 htab->elf.splt->contents + h->plt.offset + 20);
3643 }
3644 else
3645 {
3646 memcpy (htab->elf.splt->contents + h->plt.offset,
3647 elf_s390_plt_pic_entry,
3648 PLT_ENTRY_SIZE);
3649
3650 /* Adjust the jump to the first plt entry. */
3651 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3652 htab->elf.splt->contents + h->plt.offset + 20);
3653
3654 /* Push the GOT offset field. */
3655 bfd_put_32 (output_bfd, got_offset,
3656 htab->elf.splt->contents + h->plt.offset + 24);
3657 }
3658 /* Insert offset into reloc. table here. */
3659 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3660 htab->elf.splt->contents + h->plt.offset + 28);
3661
3662 /* Fill in the entry in the global offset table.
3663 Points to instruction after GOT offset. */
3664 bfd_put_32 (output_bfd,
3665 (htab->elf.splt->output_section->vma
3666 + htab->elf.splt->output_offset
3667 + h->plt.offset
3668 + 12),
3669 htab->elf.sgotplt->contents + got_offset);
3670
3671 /* Fill in the entry in the .rela.plt section. */
3672 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3673 + htab->elf.sgotplt->output_offset
3674 + got_offset);
3675 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3676 rela.r_addend = 0;
3677 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3678 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3679
3680 if (!h->def_regular)
3681 {
3682 /* Mark the symbol as undefined, rather than as defined in
3683 the .plt section. Leave the value alone. This is a clue
3684 for the dynamic linker, to make function pointer
3685 comparisons work between an application and shared
3686 library. */
3687 sym->st_shndx = SHN_UNDEF;
3688 }
3689 }
3690 }
3691
3692 if (h->got.offset != (bfd_vma) -1
3693 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3694 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3695 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3696 {
3697 Elf_Internal_Rela rela;
3698 bfd_byte *loc;
3699
3700 /* This symbol has an entry in the global offset table. Set it
3701 up. */
3702
3703 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3704 abort ();
3705
3706 rela.r_offset = (htab->elf.sgot->output_section->vma
3707 + htab->elf.sgot->output_offset
3708 + (h->got.offset &~ (bfd_vma) 1));
3709
3710 /* If this is a static link, or it is a -Bsymbolic link and the
3711 symbol is defined locally or was forced to be local because
3712 of a version file, we just want to emit a RELATIVE reloc.
3713 The entry in the global offset table will already have been
3714 initialized in the relocate_section function. */
3715 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3716 {
3717 if (bfd_link_pic (info))
3718 {
3719 /* An explicit GOT slot usage needs GLOB_DAT. If the
3720 symbol references local the implicit got.iplt slot
3721 will be used and the IRELATIVE reloc has been created
3722 above. */
3723 goto do_glob_dat;
3724 }
3725 else
3726 {
3727 /* For non-shared objects explicit GOT slots must be
3728 filled with the PLT slot address for pointer
3729 equality reasons. */
3730 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3731 + htab->elf.iplt->output_offset
3732 + h->plt.offset),
3733 htab->elf.sgot->contents + h->got.offset);
3734 return TRUE;
3735 }
3736 }
3737 else if (bfd_link_pic (info)
3738 && SYMBOL_REFERENCES_LOCAL (info, h))
3739 {
3740 /* If this is a static link, or it is a -Bsymbolic link and
3741 the symbol is defined locally or was forced to be local
3742 because of a version file, we just want to emit a
3743 RELATIVE reloc. The entry in the global offset table
3744 will already have been initialized in the
3745 relocate_section function. */
3746 if (!h->def_regular)
3747 return FALSE;
3748 BFD_ASSERT((h->got.offset & 1) != 0);
3749 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3750 rela.r_addend = (h->root.u.def.value
3751 + h->root.u.def.section->output_section->vma
3752 + h->root.u.def.section->output_offset);
3753 }
3754 else
3755 {
3756 BFD_ASSERT((h->got.offset & 1) == 0);
3757 do_glob_dat:
3758 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3759 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3760 rela.r_addend = 0;
3761 }
3762
3763 loc = htab->elf.srelgot->contents;
3764 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3765 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3766 }
3767
3768 if (h->needs_copy)
3769 {
3770 Elf_Internal_Rela rela;
3771 bfd_byte *loc;
3772
3773 /* This symbols needs a copy reloc. Set it up. */
3774
3775 if (h->dynindx == -1
3776 || (h->root.type != bfd_link_hash_defined
3777 && h->root.type != bfd_link_hash_defweak)
3778 || htab->srelbss == NULL)
3779 abort ();
3780
3781 rela.r_offset = (h->root.u.def.value
3782 + h->root.u.def.section->output_section->vma
3783 + h->root.u.def.section->output_offset);
3784 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3785 rela.r_addend = 0;
3786 loc = htab->srelbss->contents;
3787 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3788 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3789 }
3790
3791 /* Mark some specially defined symbols as absolute. */
3792 if (h == htab->elf.hdynamic
3793 || h == htab->elf.hgot
3794 || h == htab->elf.hplt)
3795 sym->st_shndx = SHN_ABS;
3796
3797 return TRUE;
3798 }
3799
3800 /* Used to decide how to sort relocs in an optimal manner for the
3801 dynamic linker, before writing them out. */
3802
3803 static enum elf_reloc_type_class
3804 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3805 const asection *rel_sec ATTRIBUTE_UNUSED,
3806 const Elf_Internal_Rela *rela)
3807 {
3808 switch ((int) ELF32_R_TYPE (rela->r_info))
3809 {
3810 case R_390_RELATIVE:
3811 return reloc_class_relative;
3812 case R_390_JMP_SLOT:
3813 return reloc_class_plt;
3814 case R_390_COPY:
3815 return reloc_class_copy;
3816 default:
3817 return reloc_class_normal;
3818 }
3819 }
3820
3821 /* Finish up the dynamic sections. */
3822
3823 static bfd_boolean
3824 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3825 struct bfd_link_info *info)
3826 {
3827 struct elf_s390_link_hash_table *htab;
3828 bfd *dynobj;
3829 asection *sdyn;
3830 bfd *ibfd;
3831 unsigned int i;
3832
3833 htab = elf_s390_hash_table (info);
3834 dynobj = htab->elf.dynobj;
3835 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3836
3837 if (htab->elf.dynamic_sections_created)
3838 {
3839 Elf32_External_Dyn *dyncon, *dynconend;
3840
3841 if (sdyn == NULL || htab->elf.sgot == NULL)
3842 abort ();
3843
3844 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3845 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3846 for (; dyncon < dynconend; dyncon++)
3847 {
3848 Elf_Internal_Dyn dyn;
3849 asection *s;
3850
3851 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3852
3853 switch (dyn.d_tag)
3854 {
3855 default:
3856 continue;
3857
3858 case DT_PLTGOT:
3859 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma;
3860 break;
3861
3862 case DT_JMPREL:
3863 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
3864 break;
3865
3866 case DT_PLTRELSZ:
3867 s = htab->elf.srelplt->output_section;
3868 dyn.d_un.d_val = s->size;
3869 break;
3870 }
3871
3872 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3873 }
3874
3875 /* Fill in the special first entry in the procedure linkage table. */
3876 if (htab->elf.splt && htab->elf.splt->size > 0)
3877 {
3878 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3879 if (bfd_link_pic (info))
3880 {
3881 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3882 PLT_FIRST_ENTRY_SIZE);
3883 }
3884 else
3885 {
3886 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3887 PLT_FIRST_ENTRY_SIZE);
3888 bfd_put_32 (output_bfd,
3889 htab->elf.sgotplt->output_section->vma
3890 + htab->elf.sgotplt->output_offset,
3891 htab->elf.splt->contents + 24);
3892 }
3893 elf_section_data (htab->elf.splt->output_section)
3894 ->this_hdr.sh_entsize = 4;
3895 }
3896
3897 }
3898
3899 if (htab->elf.sgotplt)
3900 {
3901 /* Fill in the first three entries in the global offset table. */
3902 if (htab->elf.sgotplt->size > 0)
3903 {
3904 bfd_put_32 (output_bfd,
3905 (sdyn == NULL ? (bfd_vma) 0
3906 : sdyn->output_section->vma + sdyn->output_offset),
3907 htab->elf.sgotplt->contents);
3908 /* One entry for shared object struct ptr. */
3909 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3910 /* One entry for _dl_runtime_resolve. */
3911 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3912 }
3913
3914 elf_section_data (htab->elf.sgotplt->output_section)
3915 ->this_hdr.sh_entsize = 4;
3916 }
3917 /* Finish dynamic symbol for local IFUNC symbols. */
3918 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3919 {
3920 struct plt_entry *local_plt;
3921 Elf_Internal_Sym *isym;
3922 Elf_Internal_Shdr *symtab_hdr;
3923
3924 symtab_hdr = &elf_symtab_hdr (ibfd);
3925
3926 local_plt = elf_s390_local_plt (ibfd);
3927 if (local_plt != NULL)
3928 for (i = 0; i < symtab_hdr->sh_info; i++)
3929 {
3930 if (local_plt[i].plt.offset != (bfd_vma) -1)
3931 {
3932 asection *sec = local_plt[i].sec;
3933 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3934 if (isym == NULL)
3935 return FALSE;
3936
3937 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3938 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3939 local_plt[i].plt.offset,
3940 isym->st_value
3941 + sec->output_section->vma
3942 + sec->output_offset);
3943
3944 }
3945 }
3946 }
3947 return TRUE;
3948 }
3949
3950 static bfd_boolean
3951 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3952 {
3953 int offset;
3954 unsigned int size;
3955
3956 switch (note->descsz)
3957 {
3958 default:
3959 return FALSE;
3960
3961 case 224: /* S/390 Linux. */
3962 /* pr_cursig */
3963 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3964
3965 /* pr_pid */
3966 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
3967
3968 /* pr_reg */
3969 offset = 72;
3970 size = 144;
3971 break;
3972 }
3973
3974 /* Make a ".reg/999" section. */
3975 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3976 size, note->descpos + offset);
3977 }
3978
3979 /* Return address for Ith PLT stub in section PLT, for relocation REL
3980 or (bfd_vma) -1 if it should not be included. */
3981
3982 static bfd_vma
3983 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3984 const arelent *rel ATTRIBUTE_UNUSED)
3985 {
3986 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3987 }
3988
3989 /* Merge backend specific data from an object file to the output
3990 object file when linking. */
3991
3992 static bfd_boolean
3993 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3994 {
3995 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
3996 return TRUE;
3997
3998 if (!elf_s390_merge_obj_attributes (ibfd, obfd))
3999 return FALSE;
4000
4001 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
4002 return TRUE;
4003 }
4004
4005
4006 #define TARGET_BIG_SYM s390_elf32_vec
4007 #define TARGET_BIG_NAME "elf32-s390"
4008 #define ELF_ARCH bfd_arch_s390
4009 #define ELF_TARGET_ID S390_ELF_DATA
4010 #define ELF_MACHINE_CODE EM_S390
4011 #define ELF_MACHINE_ALT1 EM_S390_OLD
4012 #define ELF_MAXPAGESIZE 0x1000
4013
4014 #define elf_backend_can_gc_sections 1
4015 #define elf_backend_can_refcount 1
4016 #define elf_backend_want_got_plt 1
4017 #define elf_backend_plt_readonly 1
4018 #define elf_backend_want_plt_sym 0
4019 #define elf_backend_got_header_size 12
4020 #define elf_backend_rela_normal 1
4021
4022 #define elf_info_to_howto elf_s390_info_to_howto
4023
4024 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
4025 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
4026 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
4027 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
4028
4029 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
4030
4031 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
4032 #define elf_backend_check_relocs elf_s390_check_relocs
4033 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
4034 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
4035 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
4036 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
4037 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
4038 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
4039 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
4040 #define elf_backend_relocate_section elf_s390_relocate_section
4041 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
4042 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4043 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
4044 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
4045 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
4046 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
4047
4048 #define bfd_elf32_mkobject elf_s390_mkobject
4049 #define elf_backend_object_p elf_s390_object_p
4050
4051 #include "elf32-target.h"
GDB Binutils - Deliverables
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