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PR19083 S/390: Fix garbage collection of some GOT relocs.
[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 &eh->dyn_relocs);
1792 else if (htab->elf.dynamic_sections_created
1793 && h->plt.refcount > 0)
1794 {
1795 /* Make sure this symbol is output as a dynamic symbol.
1796 Undefined weak syms won't yet be marked as dynamic. */
1797 if (h->dynindx == -1
1798 && !h->forced_local)
1799 {
1800 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1801 return FALSE;
1802 }
1803
1804 if (bfd_link_pic (info)
1805 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1806 {
1807 asection *s = htab->elf.splt;
1808
1809 /* If this is the first .plt entry, make room for the special
1810 first entry. */
1811 if (s->size == 0)
1812 s->size += PLT_FIRST_ENTRY_SIZE;
1813
1814 h->plt.offset = s->size;
1815
1816 /* If this symbol is not defined in a regular file, and we are
1817 not generating a shared library, then set the symbol to this
1818 location in the .plt. This is required to make function
1819 pointers compare as equal between the normal executable and
1820 the shared library. */
1821 if (! bfd_link_pic (info)
1822 && !h->def_regular)
1823 {
1824 h->root.u.def.section = s;
1825 h->root.u.def.value = h->plt.offset;
1826 }
1827
1828 /* Make room for this entry. */
1829 s->size += PLT_ENTRY_SIZE;
1830
1831 /* We also need to make an entry in the .got.plt section, which
1832 will be placed in the .got section by the linker script. */
1833 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1834
1835 /* We also need to make an entry in the .rela.plt section. */
1836 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1837 }
1838 else
1839 {
1840 h->plt.offset = (bfd_vma) -1;
1841 h->needs_plt = 0;
1842 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1843 }
1844 }
1845 else
1846 {
1847 h->plt.offset = (bfd_vma) -1;
1848 h->needs_plt = 0;
1849 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1850 }
1851
1852 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1853 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1854 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1855 we can save the dynamic TLS relocation. */
1856 if (h->got.refcount > 0
1857 && !bfd_link_pic (info)
1858 && h->dynindx == -1
1859 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1860 {
1861 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1862 /* For the GOTIE access without a literal pool entry the offset has
1863 to be stored somewhere. The immediate value in the instruction
1864 is not bit enough so the value is stored in the got. */
1865 {
1866 h->got.offset = htab->elf.sgot->size;
1867 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1868 }
1869 else
1870 h->got.offset = (bfd_vma) -1;
1871 }
1872 else if (h->got.refcount > 0)
1873 {
1874 asection *s;
1875 bfd_boolean dyn;
1876 int tls_type = elf_s390_hash_entry(h)->tls_type;
1877
1878 /* Make sure this symbol is output as a dynamic symbol.
1879 Undefined weak syms won't yet be marked as dynamic. */
1880 if (h->dynindx == -1
1881 && !h->forced_local)
1882 {
1883 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1884 return FALSE;
1885 }
1886
1887 s = htab->elf.sgot;
1888 h->got.offset = s->size;
1889 s->size += GOT_ENTRY_SIZE;
1890 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1891 if (tls_type == GOT_TLS_GD)
1892 s->size += GOT_ENTRY_SIZE;
1893 dyn = htab->elf.dynamic_sections_created;
1894 /* R_390_TLS_IE32 needs one dynamic relocation,
1895 R_390_TLS_GD32 needs one if local symbol and two if global. */
1896 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1897 || tls_type >= GOT_TLS_IE)
1898 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1899 else if (tls_type == GOT_TLS_GD)
1900 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1901 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1902 || h->root.type != bfd_link_hash_undefweak)
1903 && (bfd_link_pic (info)
1904 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1905 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1906 }
1907 else
1908 h->got.offset = (bfd_vma) -1;
1909
1910 if (eh->dyn_relocs == NULL)
1911 return TRUE;
1912
1913 /* In the shared -Bsymbolic case, discard space allocated for
1914 dynamic pc-relative relocs against symbols which turn out to be
1915 defined in regular objects. For the normal shared case, discard
1916 space for pc-relative relocs that have become local due to symbol
1917 visibility changes. */
1918
1919 if (bfd_link_pic (info))
1920 {
1921 if (SYMBOL_CALLS_LOCAL (info, h))
1922 {
1923 struct elf_dyn_relocs **pp;
1924
1925 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1926 {
1927 p->count -= p->pc_count;
1928 p->pc_count = 0;
1929 if (p->count == 0)
1930 *pp = p->next;
1931 else
1932 pp = &p->next;
1933 }
1934 }
1935
1936 /* Also discard relocs on undefined weak syms with non-default
1937 visibility. */
1938 if (eh->dyn_relocs != NULL
1939 && h->root.type == bfd_link_hash_undefweak)
1940 {
1941 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1942 eh->dyn_relocs = NULL;
1943
1944 /* Make sure undefined weak symbols are output as a dynamic
1945 symbol in PIEs. */
1946 else if (h->dynindx == -1
1947 && !h->forced_local)
1948 {
1949 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1950 return FALSE;
1951 }
1952 }
1953 }
1954 else if (ELIMINATE_COPY_RELOCS)
1955 {
1956 /* For the non-shared case, discard space for relocs against
1957 symbols which turn out to need copy relocs or are not
1958 dynamic. */
1959
1960 if (!h->non_got_ref
1961 && ((h->def_dynamic
1962 && !h->def_regular)
1963 || (htab->elf.dynamic_sections_created
1964 && (h->root.type == bfd_link_hash_undefweak
1965 || h->root.type == bfd_link_hash_undefined))))
1966 {
1967 /* Make sure this symbol is output as a dynamic symbol.
1968 Undefined weak syms won't yet be marked as dynamic. */
1969 if (h->dynindx == -1
1970 && !h->forced_local)
1971 {
1972 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1973 return FALSE;
1974 }
1975
1976 /* If that succeeded, we know we'll be keeping all the
1977 relocs. */
1978 if (h->dynindx != -1)
1979 goto keep;
1980 }
1981
1982 eh->dyn_relocs = NULL;
1983
1984 keep: ;
1985 }
1986
1987 /* Finally, allocate space. */
1988 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1989 {
1990 asection *sreloc = elf_section_data (p->sec)->sreloc;
1991
1992 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1993 }
1994
1995 return TRUE;
1996 }
1997
1998 /* Find any dynamic relocs that apply to read-only sections. */
1999
2000 static bfd_boolean
2001 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2002 {
2003 struct elf_s390_link_hash_entry *eh;
2004 struct elf_dyn_relocs *p;
2005
2006 eh = (struct elf_s390_link_hash_entry *) h;
2007 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2008 {
2009 asection *s = p->sec->output_section;
2010
2011 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2012 {
2013 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2014
2015 info->flags |= DF_TEXTREL;
2016
2017 /* Not an error, just cut short the traversal. */
2018 return FALSE;
2019 }
2020 }
2021 return TRUE;
2022 }
2023
2024 /* Set the sizes of the dynamic sections. */
2025
2026 static bfd_boolean
2027 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2028 struct bfd_link_info *info)
2029 {
2030 struct elf_s390_link_hash_table *htab;
2031 bfd *dynobj;
2032 asection *s;
2033 bfd_boolean relocs;
2034 bfd *ibfd;
2035
2036 htab = elf_s390_hash_table (info);
2037 dynobj = htab->elf.dynobj;
2038 if (dynobj == NULL)
2039 abort ();
2040
2041 if (htab->elf.dynamic_sections_created)
2042 {
2043 /* Set the contents of the .interp section to the interpreter. */
2044 if (bfd_link_executable (info) && !info->nointerp)
2045 {
2046 s = bfd_get_linker_section (dynobj, ".interp");
2047 if (s == NULL)
2048 abort ();
2049 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2050 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2051 }
2052 }
2053
2054 /* Set up .got offsets for local syms, and space for local dynamic
2055 relocs. */
2056 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2057 {
2058 bfd_signed_vma *local_got;
2059 bfd_signed_vma *end_local_got;
2060 char *local_tls_type;
2061 bfd_size_type locsymcount;
2062 Elf_Internal_Shdr *symtab_hdr;
2063 asection *srela;
2064 struct plt_entry *local_plt;
2065 unsigned int i;
2066
2067 if (! is_s390_elf (ibfd))
2068 continue;
2069
2070 for (s = ibfd->sections; s != NULL; s = s->next)
2071 {
2072 struct elf_dyn_relocs *p;
2073
2074 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2075 {
2076 if (!bfd_is_abs_section (p->sec)
2077 && bfd_is_abs_section (p->sec->output_section))
2078 {
2079 /* Input section has been discarded, either because
2080 it is a copy of a linkonce section or due to
2081 linker script /DISCARD/, so we'll be discarding
2082 the relocs too. */
2083 }
2084 else if (p->count != 0)
2085 {
2086 srela = elf_section_data (p->sec)->sreloc;
2087 srela->size += p->count * sizeof (Elf32_External_Rela);
2088 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2089 info->flags |= DF_TEXTREL;
2090 }
2091 }
2092 }
2093
2094 local_got = elf_local_got_refcounts (ibfd);
2095 if (!local_got)
2096 continue;
2097
2098 symtab_hdr = &elf_symtab_hdr (ibfd);
2099 locsymcount = symtab_hdr->sh_info;
2100 end_local_got = local_got + locsymcount;
2101 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2102 s = htab->elf.sgot;
2103 srela = htab->elf.srelgot;
2104 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2105 {
2106 if (*local_got > 0)
2107 {
2108 *local_got = s->size;
2109 s->size += GOT_ENTRY_SIZE;
2110 if (*local_tls_type == GOT_TLS_GD)
2111 s->size += GOT_ENTRY_SIZE;
2112 if (bfd_link_pic (info))
2113 srela->size += sizeof (Elf32_External_Rela);
2114 }
2115 else
2116 *local_got = (bfd_vma) -1;
2117 }
2118 local_plt = elf_s390_local_plt (ibfd);
2119 for (i = 0; i < symtab_hdr->sh_info; i++)
2120 {
2121 if (local_plt[i].plt.refcount > 0)
2122 {
2123 local_plt[i].plt.offset = htab->elf.iplt->size;
2124 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2125 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2126 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
2127 }
2128 else
2129 local_plt[i].plt.offset = (bfd_vma) -1;
2130 }
2131 }
2132
2133 if (htab->tls_ldm_got.refcount > 0)
2134 {
2135 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2136 relocs. */
2137 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2138 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2139 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
2140 }
2141 else
2142 htab->tls_ldm_got.offset = -1;
2143
2144 /* Allocate global sym .plt and .got entries, and space for global
2145 sym dynamic relocs. */
2146 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2147
2148 /* We now have determined the sizes of the various dynamic sections.
2149 Allocate memory for them. */
2150 relocs = FALSE;
2151 for (s = dynobj->sections; s != NULL; s = s->next)
2152 {
2153 if ((s->flags & SEC_LINKER_CREATED) == 0)
2154 continue;
2155
2156 if (s == htab->elf.splt
2157 || s == htab->elf.sgot
2158 || s == htab->elf.sgotplt
2159 || s == htab->sdynbss
2160 || s == htab->elf.iplt
2161 || s == htab->elf.igotplt
2162 || s == htab->irelifunc)
2163 {
2164 /* Strip this section if we don't need it; see the
2165 comment below. */
2166 }
2167 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2168 {
2169 if (s->size != 0)
2170 relocs = TRUE;
2171
2172 /* We use the reloc_count field as a counter if we need
2173 to copy relocs into the output file. */
2174 s->reloc_count = 0;
2175 }
2176 else
2177 {
2178 /* It's not one of our sections, so don't allocate space. */
2179 continue;
2180 }
2181
2182 if (s->size == 0)
2183 {
2184 /* If we don't need this section, strip it from the
2185 output file. This is to handle .rela.bss and
2186 .rela.plt. We must create it in
2187 create_dynamic_sections, because it must be created
2188 before the linker maps input sections to output
2189 sections. The linker does that before
2190 adjust_dynamic_symbol is called, and it is that
2191 function which decides whether anything needs to go
2192 into these sections. */
2193
2194 s->flags |= SEC_EXCLUDE;
2195 continue;
2196 }
2197
2198 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2199 continue;
2200
2201 /* Allocate memory for the section contents. We use bfd_zalloc
2202 here in case unused entries are not reclaimed before the
2203 section's contents are written out. This should not happen,
2204 but this way if it does, we get a R_390_NONE reloc instead
2205 of garbage. */
2206 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2207 if (s->contents == NULL)
2208 return FALSE;
2209 }
2210
2211 if (htab->elf.dynamic_sections_created)
2212 {
2213 /* Add some entries to the .dynamic section. We fill in the
2214 values later, in elf_s390_finish_dynamic_sections, but we
2215 must add the entries now so that we get the correct size for
2216 the .dynamic section. The DT_DEBUG entry is filled in by the
2217 dynamic linker and used by the debugger. */
2218 #define add_dynamic_entry(TAG, VAL) \
2219 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2220
2221 if (bfd_link_executable (info))
2222 {
2223 if (!add_dynamic_entry (DT_DEBUG, 0))
2224 return FALSE;
2225 }
2226
2227 if (htab->elf.splt->size != 0)
2228 {
2229 if (!add_dynamic_entry (DT_PLTGOT, 0)
2230 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2231 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2232 || !add_dynamic_entry (DT_JMPREL, 0))
2233 return FALSE;
2234 }
2235
2236 if (relocs)
2237 {
2238 if (!add_dynamic_entry (DT_RELA, 0)
2239 || !add_dynamic_entry (DT_RELASZ, 0)
2240 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2241 return FALSE;
2242
2243 /* If any dynamic relocs apply to a read-only section,
2244 then we need a DT_TEXTREL entry. */
2245 if ((info->flags & DF_TEXTREL) == 0)
2246 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
2247
2248 if ((info->flags & DF_TEXTREL) != 0)
2249 {
2250 if (!add_dynamic_entry (DT_TEXTREL, 0))
2251 return FALSE;
2252 }
2253 }
2254 }
2255 #undef add_dynamic_entry
2256
2257 return TRUE;
2258 }
2259
2260 /* Return the base VMA address which should be subtracted from real addresses
2261 when resolving @dtpoff relocation.
2262 This is PT_TLS segment p_vaddr. */
2263
2264 static bfd_vma
2265 dtpoff_base (struct bfd_link_info *info)
2266 {
2267 /* If tls_sec is NULL, we should have signalled an error already. */
2268 if (elf_hash_table (info)->tls_sec == NULL)
2269 return 0;
2270 return elf_hash_table (info)->tls_sec->vma;
2271 }
2272
2273 /* Return the relocation value for @tpoff relocation
2274 if STT_TLS virtual address is ADDRESS. */
2275
2276 static bfd_vma
2277 tpoff (struct bfd_link_info *info, bfd_vma address)
2278 {
2279 struct elf_link_hash_table *htab = elf_hash_table (info);
2280
2281 /* If tls_sec is NULL, we should have signalled an error already. */
2282 if (htab->tls_sec == NULL)
2283 return 0;
2284 return htab->tls_size + htab->tls_sec->vma - address;
2285 }
2286
2287 /* Complain if TLS instruction relocation is against an invalid
2288 instruction. */
2289
2290 static void
2291 invalid_tls_insn (bfd *input_bfd,
2292 asection *input_section,
2293 Elf_Internal_Rela *rel)
2294 {
2295 reloc_howto_type *howto;
2296
2297 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2298 (*_bfd_error_handler)
2299 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2300 input_bfd,
2301 input_section,
2302 (long) rel->r_offset,
2303 howto->name);
2304 bfd_set_error (bfd_error_bad_value);
2305 }
2306
2307 /* Relocate a 390 ELF section. */
2308
2309 static bfd_boolean
2310 elf_s390_relocate_section (bfd *output_bfd,
2311 struct bfd_link_info *info,
2312 bfd *input_bfd,
2313 asection *input_section,
2314 bfd_byte *contents,
2315 Elf_Internal_Rela *relocs,
2316 Elf_Internal_Sym *local_syms,
2317 asection **local_sections)
2318 {
2319 struct elf_s390_link_hash_table *htab;
2320 Elf_Internal_Shdr *symtab_hdr;
2321 struct elf_link_hash_entry **sym_hashes;
2322 bfd_vma *local_got_offsets;
2323 Elf_Internal_Rela *rel;
2324 Elf_Internal_Rela *relend;
2325
2326 BFD_ASSERT (is_s390_elf (input_bfd));
2327
2328 htab = elf_s390_hash_table (info);
2329 symtab_hdr = &elf_symtab_hdr (input_bfd);
2330 sym_hashes = elf_sym_hashes (input_bfd);
2331 local_got_offsets = elf_local_got_offsets (input_bfd);
2332
2333 rel = relocs;
2334 relend = relocs + input_section->reloc_count;
2335 for (; rel < relend; rel++)
2336 {
2337 unsigned int r_type;
2338 reloc_howto_type *howto;
2339 unsigned long r_symndx;
2340 struct elf_link_hash_entry *h;
2341 Elf_Internal_Sym *sym;
2342 asection *sec;
2343 bfd_vma off;
2344 bfd_vma relocation;
2345 bfd_boolean unresolved_reloc;
2346 bfd_reloc_status_type r;
2347 int tls_type;
2348 asection *base_got = htab->elf.sgot;
2349
2350 r_type = ELF32_R_TYPE (rel->r_info);
2351 if (r_type == (int) R_390_GNU_VTINHERIT
2352 || r_type == (int) R_390_GNU_VTENTRY)
2353 continue;
2354 if (r_type >= (int) R_390_max)
2355 {
2356 bfd_set_error (bfd_error_bad_value);
2357 return FALSE;
2358 }
2359
2360 howto = elf_howto_table + r_type;
2361 r_symndx = ELF32_R_SYM (rel->r_info);
2362
2363 h = NULL;
2364 sym = NULL;
2365 sec = NULL;
2366 unresolved_reloc = FALSE;
2367 if (r_symndx < symtab_hdr->sh_info)
2368 {
2369 sym = local_syms + r_symndx;
2370 sec = local_sections[r_symndx];
2371 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2372 {
2373 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2374 if (local_plt == NULL)
2375 return FALSE;
2376
2377 /* Address of the PLT slot. */
2378 relocation = (htab->elf.iplt->output_section->vma
2379 + htab->elf.iplt->output_offset
2380 + local_plt[r_symndx].plt.offset);
2381
2382 switch (r_type)
2383 {
2384 case R_390_PLTOFF16:
2385 case R_390_PLTOFF32:
2386 relocation -= htab->elf.sgot->output_section->vma;
2387 break;
2388 case R_390_GOTPLT12:
2389 case R_390_GOTPLT16:
2390 case R_390_GOTPLT20:
2391 case R_390_GOTPLT32:
2392 case R_390_GOTPLTENT:
2393 case R_390_GOT12:
2394 case R_390_GOT16:
2395 case R_390_GOT20:
2396 case R_390_GOT32:
2397 case R_390_GOTENT:
2398 {
2399 /* Write the PLT slot address into the GOT slot. */
2400 bfd_put_32 (output_bfd, relocation,
2401 htab->elf.sgot->contents +
2402 local_got_offsets[r_symndx]);
2403 relocation = (local_got_offsets[r_symndx] +
2404 htab->elf.sgot->output_offset);
2405
2406 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2407 relocation += htab->elf.sgot->output_section->vma;
2408 break;
2409 }
2410 default:
2411 break;
2412 }
2413 /* The output section is needed later in
2414 finish_dynamic_section when creating the dynamic
2415 relocation. */
2416 local_plt[r_symndx].sec = sec;
2417 goto do_relocation;
2418 }
2419 else
2420 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2421 }
2422 else
2423 {
2424 bfd_boolean warned ATTRIBUTE_UNUSED;
2425 bfd_boolean ignored ATTRIBUTE_UNUSED;
2426
2427 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2428 r_symndx, symtab_hdr, sym_hashes,
2429 h, sec, relocation,
2430 unresolved_reloc, warned, ignored);
2431 }
2432
2433 if (sec != NULL && discarded_section (sec))
2434 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2435 rel, 1, relend, howto, 0, contents);
2436
2437 if (bfd_link_relocatable (info))
2438 continue;
2439
2440 switch (r_type)
2441 {
2442 case R_390_GOTPLT12:
2443 case R_390_GOTPLT16:
2444 case R_390_GOTPLT20:
2445 case R_390_GOTPLT32:
2446 case R_390_GOTPLTENT:
2447 /* There are three cases for a GOTPLT relocation. 1) The
2448 relocation is against the jump slot entry of a plt that
2449 will get emitted to the output file. 2) The relocation
2450 is against the jump slot of a plt entry that has been
2451 removed. elf_s390_adjust_gotplt has created a GOT entry
2452 as replacement. 3) The relocation is against a local symbol.
2453 Cases 2) and 3) are the same as the GOT relocation code
2454 so we just have to test for case 1 and fall through for
2455 the other two. */
2456 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2457 {
2458 bfd_vma plt_index;
2459
2460 if (s390_is_ifunc_symbol_p (h))
2461 {
2462 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2463 relocation = (plt_index * GOT_ENTRY_SIZE +
2464 htab->elf.igotplt->output_offset);
2465 if (r_type == R_390_GOTPLTENT)
2466 relocation += htab->elf.igotplt->output_section->vma;
2467 }
2468 else
2469 {
2470 /* Calc. index no.
2471 Current offset - size first entry / entry size. */
2472 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2473 PLT_ENTRY_SIZE;
2474
2475 /* Offset in GOT is PLT index plus GOT headers(3)
2476 times 4, addr & GOT addr. */
2477 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2478 if (r_type == R_390_GOTPLTENT)
2479 relocation += htab->elf.sgot->output_section->vma;
2480 }
2481 unresolved_reloc = FALSE;
2482
2483 }
2484 /* Fall through. */
2485
2486 case R_390_GOT12:
2487 case R_390_GOT16:
2488 case R_390_GOT20:
2489 case R_390_GOT32:
2490 case R_390_GOTENT:
2491 /* Relocation is to the entry for this symbol in the global
2492 offset table. */
2493 if (base_got == NULL)
2494 abort ();
2495
2496 if (h != NULL)
2497 {
2498 bfd_boolean dyn;
2499
2500 off = h->got.offset;
2501 dyn = htab->elf.dynamic_sections_created;
2502
2503 if (s390_is_ifunc_symbol_p (h))
2504 {
2505 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2506 if (off == (bfd_vma)-1)
2507 {
2508 /* No explicit GOT usage so redirect to the
2509 got.iplt slot. */
2510 base_got = htab->elf.igotplt;
2511 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2512 }
2513 else
2514 {
2515 /* Explicit GOT slots must contain the address
2516 of the PLT slot. This will be handled in
2517 finish_dynamic_symbol. */
2518 }
2519 }
2520 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2521 bfd_link_pic (info),
2522 h)
2523 || (bfd_link_pic (info)
2524 && SYMBOL_REFERENCES_LOCAL (info, h))
2525 || (ELF_ST_VISIBILITY (h->other)
2526 && h->root.type == bfd_link_hash_undefweak))
2527
2528 {
2529 /* This is actually a static link, or it is a
2530 -Bsymbolic link and the symbol is defined
2531 locally, or the symbol was forced to be local
2532 because of a version file. We must initialize
2533 this entry in the global offset table. Since the
2534 offset must always be a multiple of 2, we use the
2535 least significant bit to record whether we have
2536 initialized it already.
2537
2538 When doing a dynamic link, we create a .rel.got
2539 relocation entry to initialize the value. This
2540 is done in the finish_dynamic_symbol routine. */
2541 if ((off & 1) != 0)
2542 off &= ~1;
2543 else
2544 {
2545 bfd_put_32 (output_bfd, relocation,
2546 base_got->contents + off);
2547 h->got.offset |= 1;
2548 }
2549
2550 if ((h->def_regular
2551 && bfd_link_pic (info)
2552 && SYMBOL_REFERENCES_LOCAL (info, h))
2553 /* lrl rx,sym@GOTENT -> larl rx, sym */
2554 && ((r_type == R_390_GOTENT
2555 && (bfd_get_16 (input_bfd,
2556 contents + rel->r_offset - 2)
2557 & 0xff0f) == 0xc40d)
2558 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2559 || (r_type == R_390_GOT20
2560 && (bfd_get_32 (input_bfd,
2561 contents + rel->r_offset - 2)
2562 & 0xff00f000) == 0xe300c000
2563 && bfd_get_8 (input_bfd,
2564 contents + rel->r_offset + 3) == 0x58)))
2565 {
2566 unsigned short new_insn =
2567 (0xc000 | (bfd_get_8 (input_bfd,
2568 contents + rel->r_offset - 1) & 0xf0));
2569 bfd_put_16 (output_bfd, new_insn,
2570 contents + rel->r_offset - 2);
2571 r_type = R_390_PC32DBL;
2572 rel->r_addend = 2;
2573 howto = elf_howto_table + r_type;
2574 relocation = h->root.u.def.value
2575 + h->root.u.def.section->output_section->vma
2576 + h->root.u.def.section->output_offset;
2577 goto do_relocation;
2578 }
2579 }
2580 else
2581 unresolved_reloc = FALSE;
2582 }
2583 else
2584 {
2585 if (local_got_offsets == NULL)
2586 abort ();
2587
2588 off = local_got_offsets[r_symndx];
2589
2590 /* The offset must always be a multiple of 4. We use
2591 the least significant bit to record whether we have
2592 already generated the necessary reloc. */
2593 if ((off & 1) != 0)
2594 off &= ~1;
2595 else
2596 {
2597 bfd_put_32 (output_bfd, relocation,
2598 htab->elf.sgot->contents + off);
2599
2600 if (bfd_link_pic (info))
2601 {
2602 asection *srelgot;
2603 Elf_Internal_Rela outrel;
2604 bfd_byte *loc;
2605
2606 srelgot = htab->elf.srelgot;
2607 if (srelgot == NULL)
2608 abort ();
2609
2610 outrel.r_offset = (htab->elf.sgot->output_section->vma
2611 + htab->elf.sgot->output_offset
2612 + off);
2613 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2614 outrel.r_addend = relocation;
2615 loc = srelgot->contents;
2616 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2617 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2618 }
2619
2620 local_got_offsets[r_symndx] |= 1;
2621 }
2622 }
2623
2624 if (off >= (bfd_vma) -2)
2625 abort ();
2626
2627 relocation = base_got->output_offset + off;
2628
2629 /* For @GOTENT the relocation is against the offset between
2630 the instruction and the symbols entry in the GOT and not
2631 between the start of the GOT and the symbols entry. We
2632 add the vma of the GOT to get the correct value. */
2633 if ( r_type == R_390_GOTENT
2634 || r_type == R_390_GOTPLTENT)
2635 relocation += base_got->output_section->vma;
2636
2637 break;
2638
2639 case R_390_GOTOFF16:
2640 case R_390_GOTOFF32:
2641 /* Relocation is relative to the start of the global offset
2642 table. */
2643
2644 /* Note that sgot->output_offset is not involved in this
2645 calculation. We always want the start of .got. If we
2646 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2647 permitted by the ABI, we might have to change this
2648 calculation. */
2649 relocation -= htab->elf.sgot->output_section->vma;
2650 break;
2651
2652 case R_390_GOTPC:
2653 case R_390_GOTPCDBL:
2654 /* Use global offset table as symbol value. */
2655 relocation = htab->elf.sgot->output_section->vma;
2656 unresolved_reloc = FALSE;
2657 break;
2658
2659 case R_390_PLT12DBL:
2660 case R_390_PLT16DBL:
2661 case R_390_PLT24DBL:
2662 case R_390_PLT32DBL:
2663 case R_390_PLT32:
2664 /* Relocation is to the entry for this symbol in the
2665 procedure linkage table. */
2666
2667 /* Resolve a PLT32 reloc against a local symbol directly,
2668 without using the procedure linkage table. */
2669 if (h == NULL)
2670 break;
2671
2672 if (h->plt.offset == (bfd_vma) -1
2673 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2674 {
2675 /* We didn't make a PLT entry for this symbol. This
2676 happens when statically linking PIC code, or when
2677 using -Bsymbolic. */
2678 break;
2679 }
2680
2681 if (s390_is_ifunc_symbol_p (h))
2682 relocation = (htab->elf.iplt->output_section->vma
2683 + htab->elf.iplt->output_offset
2684 + h->plt.offset);
2685 else
2686 relocation = (htab->elf.splt->output_section->vma
2687 + htab->elf.splt->output_offset
2688 + h->plt.offset);
2689 unresolved_reloc = FALSE;
2690 break;
2691
2692 case R_390_PLTOFF16:
2693 case R_390_PLTOFF32:
2694 /* Relocation is to the entry for this symbol in the
2695 procedure linkage table relative to the start of the GOT. */
2696
2697 /* For local symbols or if we didn't make a PLT entry for
2698 this symbol resolve the symbol directly. */
2699 if (h == NULL
2700 || h->plt.offset == (bfd_vma) -1
2701 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2702 {
2703 relocation -= htab->elf.sgot->output_section->vma;
2704 break;
2705 }
2706
2707 if (s390_is_ifunc_symbol_p (h))
2708 relocation = (htab->elf.iplt->output_section->vma
2709 + htab->elf.iplt->output_offset
2710 + h->plt.offset
2711 - htab->elf.sgot->output_section->vma);
2712 else
2713 relocation = (htab->elf.splt->output_section->vma
2714 + htab->elf.splt->output_offset
2715 + h->plt.offset
2716 - htab->elf.sgot->output_section->vma);
2717 unresolved_reloc = FALSE;
2718 break;
2719
2720 case R_390_8:
2721 case R_390_16:
2722 case R_390_32:
2723 case R_390_PC16:
2724 case R_390_PC12DBL:
2725 case R_390_PC16DBL:
2726 case R_390_PC24DBL:
2727 case R_390_PC32DBL:
2728 case R_390_PC32:
2729 if (h != NULL
2730 && s390_is_ifunc_symbol_p (h)
2731 && h->def_regular)
2732 {
2733 if (!bfd_link_pic (info) || !h->non_got_ref)
2734 {
2735 /* For a non-shared object STT_GNU_IFUNC symbol must
2736 go through PLT. */
2737 relocation = (htab->elf.iplt->output_section->vma
2738 + htab->elf.iplt->output_offset
2739 + h ->plt.offset);
2740 goto do_relocation;
2741 }
2742 else
2743 {
2744 /* For shared objects a runtime relocation is needed. */
2745
2746 Elf_Internal_Rela outrel;
2747 asection *sreloc;
2748
2749 /* Need a dynamic relocation to get the real function
2750 address. */
2751 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2752 info,
2753 input_section,
2754 rel->r_offset);
2755 if (outrel.r_offset == (bfd_vma) -1
2756 || outrel.r_offset == (bfd_vma) -2)
2757 abort ();
2758
2759 outrel.r_offset += (input_section->output_section->vma
2760 + input_section->output_offset);
2761
2762 if (h->dynindx == -1
2763 || h->forced_local
2764 || bfd_link_executable (info))
2765 {
2766 /* This symbol is resolved locally. */
2767 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2768 outrel.r_addend = (h->root.u.def.value
2769 + h->root.u.def.section->output_section->vma
2770 + h->root.u.def.section->output_offset);
2771 }
2772 else
2773 {
2774 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2775 outrel.r_addend = 0;
2776 }
2777
2778 sreloc = htab->elf.irelifunc;
2779 elf_append_rela (output_bfd, sreloc, &outrel);
2780
2781 /* If this reloc is against an external symbol, we
2782 do not want to fiddle with the addend. Otherwise,
2783 we need to include the symbol value so that it
2784 becomes an addend for the dynamic reloc. For an
2785 internal symbol, we have updated addend. */
2786 continue;
2787 }
2788 }
2789
2790 if ((input_section->flags & SEC_ALLOC) == 0)
2791 break;
2792
2793 if ((bfd_link_pic (info)
2794 && (h == NULL
2795 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2796 || h->root.type != bfd_link_hash_undefweak)
2797 && ((r_type != R_390_PC16
2798 && r_type != R_390_PC12DBL
2799 && r_type != R_390_PC16DBL
2800 && r_type != R_390_PC24DBL
2801 && r_type != R_390_PC32DBL
2802 && r_type != R_390_PC32)
2803 || !SYMBOL_CALLS_LOCAL (info, h)))
2804 || (ELIMINATE_COPY_RELOCS
2805 && !bfd_link_pic (info)
2806 && h != NULL
2807 && h->dynindx != -1
2808 && !h->non_got_ref
2809 && ((h->def_dynamic
2810 && !h->def_regular)
2811 || h->root.type == bfd_link_hash_undefweak
2812 || h->root.type == bfd_link_hash_undefined)))
2813 {
2814 Elf_Internal_Rela outrel;
2815 bfd_boolean skip, relocate;
2816 asection *sreloc;
2817 bfd_byte *loc;
2818
2819 /* When generating a shared object, these relocations
2820 are copied into the output file to be resolved at run
2821 time. */
2822
2823 skip = FALSE;
2824 relocate = FALSE;
2825
2826 outrel.r_offset =
2827 _bfd_elf_section_offset (output_bfd, info, input_section,
2828 rel->r_offset);
2829 if (outrel.r_offset == (bfd_vma) -1)
2830 skip = TRUE;
2831 else if (outrel.r_offset == (bfd_vma) -2)
2832 skip = TRUE, relocate = TRUE;
2833 outrel.r_offset += (input_section->output_section->vma
2834 + input_section->output_offset);
2835
2836 if (skip)
2837 memset (&outrel, 0, sizeof outrel);
2838 else if (h != NULL
2839 && h->dynindx != -1
2840 && (r_type == R_390_PC16
2841 || r_type == R_390_PC12DBL
2842 || r_type == R_390_PC16DBL
2843 || r_type == R_390_PC24DBL
2844 || r_type == R_390_PC32DBL
2845 || r_type == R_390_PC32
2846 || !bfd_link_pic (info)
2847 || !SYMBOLIC_BIND (info, h)
2848 || !h->def_regular))
2849 {
2850 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2851 outrel.r_addend = rel->r_addend;
2852 }
2853 else
2854 {
2855 /* This symbol is local, or marked to become local. */
2856 outrel.r_addend = relocation + rel->r_addend;
2857 if (r_type == R_390_32)
2858 {
2859 relocate = TRUE;
2860 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2861 }
2862 else
2863 {
2864 long sindx;
2865
2866 if (bfd_is_abs_section (sec))
2867 sindx = 0;
2868 else if (sec == NULL || sec->owner == NULL)
2869 {
2870 bfd_set_error(bfd_error_bad_value);
2871 return FALSE;
2872 }
2873 else
2874 {
2875 asection *osec;
2876
2877 osec = sec->output_section;
2878 sindx = elf_section_data (osec)->dynindx;
2879 if (sindx == 0)
2880 {
2881 osec = htab->elf.text_index_section;
2882 sindx = elf_section_data (osec)->dynindx;
2883 }
2884 BFD_ASSERT (sindx != 0);
2885
2886 /* We are turning this relocation into one
2887 against a section symbol, so subtract out
2888 the output section's address but not the
2889 offset of the input section in the output
2890 section. */
2891 outrel.r_addend -= osec->vma;
2892 }
2893 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2894 }
2895 }
2896
2897 sreloc = elf_section_data (input_section)->sreloc;
2898 if (sreloc == NULL)
2899 abort ();
2900
2901 loc = sreloc->contents;
2902 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2903 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2904
2905 /* If this reloc is against an external symbol, we do
2906 not want to fiddle with the addend. Otherwise, we
2907 need to include the symbol value so that it becomes
2908 an addend for the dynamic reloc. */
2909 if (! relocate)
2910 continue;
2911 }
2912 break;
2913
2914 /* Relocations for tls literal pool entries. */
2915 case R_390_TLS_IE32:
2916 if (bfd_link_pic (info))
2917 {
2918 Elf_Internal_Rela outrel;
2919 asection *sreloc;
2920 bfd_byte *loc;
2921
2922 outrel.r_offset = rel->r_offset
2923 + input_section->output_section->vma
2924 + input_section->output_offset;
2925 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2926 sreloc = elf_section_data (input_section)->sreloc;
2927 if (sreloc == NULL)
2928 abort ();
2929 loc = sreloc->contents;
2930 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2931 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2932 }
2933 /* Fall through. */
2934
2935 case R_390_TLS_GD32:
2936 case R_390_TLS_GOTIE32:
2937 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2938 tls_type = GOT_UNKNOWN;
2939 if (h == NULL && local_got_offsets)
2940 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2941 else if (h != NULL)
2942 {
2943 tls_type = elf_s390_hash_entry(h)->tls_type;
2944 if (!bfd_link_pic (info)
2945 && h->dynindx == -1
2946 && tls_type >= GOT_TLS_IE)
2947 r_type = R_390_TLS_LE32;
2948 }
2949 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2950 r_type = R_390_TLS_IE32;
2951
2952 if (r_type == R_390_TLS_LE32)
2953 {
2954 /* This relocation gets optimized away by the local exec
2955 access optimization. */
2956 BFD_ASSERT (! unresolved_reloc);
2957 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2958 contents + rel->r_offset);
2959 continue;
2960 }
2961
2962 if (htab->elf.sgot == NULL)
2963 abort ();
2964
2965 if (h != NULL)
2966 off = h->got.offset;
2967 else
2968 {
2969 if (local_got_offsets == NULL)
2970 abort ();
2971
2972 off = local_got_offsets[r_symndx];
2973 }
2974
2975 emit_tls_relocs:
2976
2977 if ((off & 1) != 0)
2978 off &= ~1;
2979 else
2980 {
2981 Elf_Internal_Rela outrel;
2982 bfd_byte *loc;
2983 int dr_type, indx;
2984
2985 if (htab->elf.srelgot == NULL)
2986 abort ();
2987
2988 outrel.r_offset = (htab->elf.sgot->output_section->vma
2989 + htab->elf.sgot->output_offset + off);
2990
2991 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2992 if (r_type == R_390_TLS_GD32)
2993 dr_type = R_390_TLS_DTPMOD;
2994 else
2995 dr_type = R_390_TLS_TPOFF;
2996 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2997 outrel.r_addend = relocation - dtpoff_base (info);
2998 else
2999 outrel.r_addend = 0;
3000 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3001 loc = htab->elf.srelgot->contents;
3002 loc += htab->elf.srelgot->reloc_count++
3003 * sizeof (Elf32_External_Rela);
3004 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3005
3006 if (r_type == R_390_TLS_GD32)
3007 {
3008 if (indx == 0)
3009 {
3010 BFD_ASSERT (! unresolved_reloc);
3011 bfd_put_32 (output_bfd,
3012 relocation - dtpoff_base (info),
3013 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3014 }
3015 else
3016 {
3017 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
3018 outrel.r_offset += GOT_ENTRY_SIZE;
3019 outrel.r_addend = 0;
3020 htab->elf.srelgot->reloc_count++;
3021 loc += sizeof (Elf32_External_Rela);
3022 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3023 }
3024 }
3025
3026 if (h != NULL)
3027 h->got.offset |= 1;
3028 else
3029 local_got_offsets[r_symndx] |= 1;
3030 }
3031
3032 if (off >= (bfd_vma) -2)
3033 abort ();
3034 if (r_type == ELF32_R_TYPE (rel->r_info))
3035 {
3036 relocation = htab->elf.sgot->output_offset + off;
3037 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
3038 relocation += htab->elf.sgot->output_section->vma;
3039 unresolved_reloc = FALSE;
3040 }
3041 else
3042 {
3043 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
3044 contents + rel->r_offset);
3045 continue;
3046 }
3047 break;
3048
3049 case R_390_TLS_GOTIE12:
3050 case R_390_TLS_GOTIE20:
3051 case R_390_TLS_IEENT:
3052 if (h == NULL)
3053 {
3054 if (local_got_offsets == NULL)
3055 abort();
3056 off = local_got_offsets[r_symndx];
3057 if (bfd_link_pic (info))
3058 goto emit_tls_relocs;
3059 }
3060 else
3061 {
3062 off = h->got.offset;
3063 tls_type = elf_s390_hash_entry(h)->tls_type;
3064 if (bfd_link_pic (info)
3065 || h->dynindx != -1
3066 || tls_type < GOT_TLS_IE)
3067 goto emit_tls_relocs;
3068 }
3069
3070 if (htab->elf.sgot == NULL)
3071 abort ();
3072
3073 BFD_ASSERT (! unresolved_reloc);
3074 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3075 htab->elf.sgot->contents + off);
3076 relocation = htab->elf.sgot->output_offset + off;
3077 if (r_type == R_390_TLS_IEENT)
3078 relocation += htab->elf.sgot->output_section->vma;
3079 unresolved_reloc = FALSE;
3080 break;
3081
3082 case R_390_TLS_LDM32:
3083 if (! bfd_link_pic (info))
3084 /* The literal pool entry this relocation refers to gets ignored
3085 by the optimized code of the local exec model. Do nothing
3086 and the value will turn out zero. */
3087 continue;
3088
3089 if (htab->elf.sgot == NULL)
3090 abort ();
3091
3092 off = htab->tls_ldm_got.offset;
3093 if (off & 1)
3094 off &= ~1;
3095 else
3096 {
3097 Elf_Internal_Rela outrel;
3098 bfd_byte *loc;
3099
3100 if (htab->elf.srelgot == NULL)
3101 abort ();
3102
3103 outrel.r_offset = (htab->elf.sgot->output_section->vma
3104 + htab->elf.sgot->output_offset + off);
3105
3106 bfd_put_32 (output_bfd, 0,
3107 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3108 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
3109 outrel.r_addend = 0;
3110 loc = htab->elf.srelgot->contents;
3111 loc += htab->elf.srelgot->reloc_count++
3112 * sizeof (Elf32_External_Rela);
3113 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3114 htab->tls_ldm_got.offset |= 1;
3115 }
3116 relocation = htab->elf.sgot->output_offset + off;
3117 unresolved_reloc = FALSE;
3118 break;
3119
3120 case R_390_TLS_LE32:
3121 if (bfd_link_dll (info))
3122 {
3123 /* Linking a shared library with non-fpic code requires
3124 a R_390_TLS_TPOFF relocation. */
3125 Elf_Internal_Rela outrel;
3126 asection *sreloc;
3127 bfd_byte *loc;
3128 int indx;
3129
3130 outrel.r_offset = rel->r_offset
3131 + input_section->output_section->vma
3132 + input_section->output_offset;
3133 if (h != NULL && h->dynindx != -1)
3134 indx = h->dynindx;
3135 else
3136 indx = 0;
3137 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
3138 if (indx == 0)
3139 outrel.r_addend = relocation - dtpoff_base (info);
3140 else
3141 outrel.r_addend = 0;
3142 sreloc = elf_section_data (input_section)->sreloc;
3143 if (sreloc == NULL)
3144 abort ();
3145 loc = sreloc->contents;
3146 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3147 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3148 }
3149 else
3150 {
3151 BFD_ASSERT (! unresolved_reloc);
3152 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3153 contents + rel->r_offset);
3154 }
3155 continue;
3156
3157 case R_390_TLS_LDO32:
3158 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
3159 relocation -= dtpoff_base (info);
3160 else
3161 /* When converting LDO to LE, we must negate. */
3162 relocation = -tpoff (info, relocation);
3163 break;
3164
3165 /* Relocations for tls instructions. */
3166 case R_390_TLS_LOAD:
3167 case R_390_TLS_GDCALL:
3168 case R_390_TLS_LDCALL:
3169 tls_type = GOT_UNKNOWN;
3170 if (h == NULL && local_got_offsets)
3171 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3172 else if (h != NULL)
3173 tls_type = elf_s390_hash_entry(h)->tls_type;
3174
3175 if (tls_type == GOT_TLS_GD)
3176 continue;
3177
3178 if (r_type == R_390_TLS_LOAD)
3179 {
3180 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3181 {
3182 /* IE->LE transition. Four valid cases:
3183 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
3184 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
3185 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
3186 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3187 unsigned int insn, ry;
3188
3189 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3190 ry = 0;
3191 if ((insn & 0xff00f000) == 0x58000000)
3192 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
3193 ry = (insn & 0x000f0000);
3194 else if ((insn & 0xff0f0000) == 0x58000000)
3195 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
3196 ry = (insn & 0x0000f000) << 4;
3197 else if ((insn & 0xff00f000) == 0x5800c000)
3198 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
3199 ry = (insn & 0x000f0000);
3200 else if ((insn & 0xff0f0000) == 0x580c0000)
3201 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3202 ry = (insn & 0x0000f000) << 4;
3203 else
3204 invalid_tls_insn (input_bfd, input_section, rel);
3205 insn = 0x18000700 | (insn & 0x00f00000) | ry;
3206 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3207 }
3208 }
3209 else if (r_type == R_390_TLS_GDCALL)
3210 {
3211 unsigned int insn;
3212
3213 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3214 if ((insn & 0xff000fff) != 0x4d000000 &&
3215 (insn & 0xffff0000) != 0xc0e50000 &&
3216 (insn & 0xff000000) != 0x0d000000)
3217 invalid_tls_insn (input_bfd, input_section, rel);
3218 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3219 {
3220 if ((insn & 0xff000000) == 0x0d000000)
3221 {
3222 /* GD->LE transition.
3223 basr rx, ry -> nopr r7 */
3224 insn = 0x07070000 | (insn & 0xffff);
3225 }
3226 else if ((insn & 0xff000000) == 0x4d000000)
3227 {
3228 /* GD->LE transition.
3229 bas %r14,0(%rx,%r13) -> bc 0,0 */
3230 insn = 0x47000000;
3231 }
3232 else
3233 {
3234 /* GD->LE transition.
3235 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
3236 insn = 0xc0040000;
3237 bfd_put_16 (output_bfd, 0x0000,
3238 contents + rel->r_offset + 4);
3239 }
3240 }
3241 else
3242 {
3243 /* If basr is used in the pic case to invoke
3244 _tls_get_offset, something went wrong before. */
3245 if ((insn & 0xff000000) == 0x0d000000)
3246 invalid_tls_insn (input_bfd, input_section, rel);
3247
3248 if ((insn & 0xff000000) == 0x4d000000)
3249 {
3250 /* GD->IE transition.
3251 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3252 insn = 0x5822c000;
3253 }
3254 else
3255 {
3256 /* GD->IE transition.
3257 brasl %r14,__tls_get_addr@plt ->
3258 l %r2,0(%r2,%r12) ; bcr 0,0 */
3259 insn = 0x5822c000;
3260 bfd_put_16 (output_bfd, 0x0700,
3261 contents + rel->r_offset + 4);
3262 }
3263 }
3264 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3265 }
3266 else if (r_type == R_390_TLS_LDCALL)
3267 {
3268 if (!bfd_link_pic (info))
3269 {
3270 unsigned int insn;
3271
3272 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3273 if ((insn & 0xff000fff) != 0x4d000000 &&
3274 (insn & 0xffff0000) != 0xc0e50000 &&
3275 (insn & 0xff000000) != 0x0d000000)
3276 invalid_tls_insn (input_bfd, input_section, rel);
3277
3278 if ((insn & 0xff000000) == 0x0d000000)
3279 {
3280 /* LD->LE transition.
3281 basr rx, ry -> nopr r7 */
3282 insn = 0x07070000 | (insn & 0xffff);
3283 }
3284 else if ((insn & 0xff000000) == 0x4d000000)
3285 {
3286 /* LD->LE transition.
3287 bas %r14,0(%rx,%r13) -> bc 0,0 */
3288 insn = 0x47000000;
3289 }
3290 else
3291 {
3292 /* LD->LE transition.
3293 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3294 insn = 0xc0040000;
3295 bfd_put_16 (output_bfd, 0x0000,
3296 contents + rel->r_offset + 4);
3297 }
3298 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3299 }
3300 }
3301 continue;
3302
3303 default:
3304 break;
3305 }
3306
3307 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3308 because such sections are not SEC_ALLOC and thus ld.so will
3309 not process them. */
3310 if (unresolved_reloc
3311 && !((input_section->flags & SEC_DEBUGGING) != 0
3312 && h->def_dynamic)
3313 && _bfd_elf_section_offset (output_bfd, info, input_section,
3314 rel->r_offset) != (bfd_vma) -1)
3315 (*_bfd_error_handler)
3316 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3317 input_bfd,
3318 input_section,
3319 (long) rel->r_offset,
3320 howto->name,
3321 h->root.root.string);
3322
3323 do_relocation:
3324
3325 /* When applying a 24 bit reloc we need to start one byte
3326 earlier. Otherwise the 32 bit get/put bfd operations might
3327 access a byte after the actual section. */
3328 if (r_type == R_390_PC24DBL
3329 || r_type == R_390_PLT24DBL)
3330 rel->r_offset--;
3331
3332 if (r_type == R_390_20
3333 || r_type == R_390_GOT20
3334 || r_type == R_390_GOTPLT20
3335 || r_type == R_390_TLS_GOTIE20)
3336 {
3337 relocation += rel->r_addend;
3338 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3339 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3340 contents, rel->r_offset,
3341 relocation, 0);
3342 }
3343 else
3344 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3345 contents, rel->r_offset,
3346 relocation, rel->r_addend);
3347
3348 if (r != bfd_reloc_ok)
3349 {
3350 const char *name;
3351
3352 if (h != NULL)
3353 name = h->root.root.string;
3354 else
3355 {
3356 name = bfd_elf_string_from_elf_section (input_bfd,
3357 symtab_hdr->sh_link,
3358 sym->st_name);
3359 if (name == NULL)
3360 return FALSE;
3361 if (*name == '\0')
3362 name = bfd_section_name (input_bfd, sec);
3363 }
3364
3365 if (r == bfd_reloc_overflow)
3366 {
3367
3368 if (! ((*info->callbacks->reloc_overflow)
3369 (info, (h ? &h->root : NULL), name, howto->name,
3370 (bfd_vma) 0, input_bfd, input_section,
3371 rel->r_offset)))
3372 return FALSE;
3373 }
3374 else
3375 {
3376 (*_bfd_error_handler)
3377 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3378 input_bfd, input_section,
3379 (long) rel->r_offset, name, (int) r);
3380 return FALSE;
3381 }
3382 }
3383 }
3384
3385 return TRUE;
3386 }
3387
3388 /* Generate the PLT slots together with the dynamic relocations needed
3389 for IFUNC symbols. */
3390
3391 static void
3392 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3393 struct bfd_link_info *info,
3394 struct elf_link_hash_entry *h,
3395 struct elf_s390_link_hash_table *htab,
3396 bfd_vma iplt_offset,
3397 bfd_vma resolver_address)
3398 {
3399 bfd_vma iplt_index;
3400 bfd_vma got_offset;
3401 bfd_vma igotiplt_offset;
3402 Elf_Internal_Rela rela;
3403 bfd_byte *loc;
3404 asection *plt, *gotplt, *relplt;
3405 bfd_vma relative_offset;
3406
3407 if (htab->elf.iplt == NULL
3408 || htab->elf.igotplt == NULL
3409 || htab->elf.irelplt == NULL)
3410 abort ();
3411
3412 gotplt = htab->elf.igotplt;
3413 relplt = htab->elf.irelplt;
3414
3415 /* Index of the PLT slot within iplt section. */
3416 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3417 plt = htab->elf.iplt;
3418 /* Offset into the igot.plt section. */
3419 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3420 /* Offset into the got section. */
3421 got_offset = igotiplt_offset + gotplt->output_offset;
3422
3423 /* S390 uses halfwords for relative branch calc! */
3424 relative_offset = - (plt->output_offset +
3425 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3426 /* If offset is > 32768, branch to a previous branch
3427 390 can only handle +-64 K jumps. */
3428 if ( -32768 > (int) relative_offset )
3429 relative_offset
3430 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3431
3432 /* Fill in the entry in the procedure linkage table. */
3433 if (!bfd_link_pic (info))
3434 {
3435 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3436 PLT_ENTRY_SIZE);
3437
3438 /* Adjust jump to the first plt entry. */
3439 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3440 plt->contents + iplt_offset + 20);
3441
3442 /* Push the GOT offset field. */
3443 bfd_put_32 (output_bfd,
3444 (gotplt->output_section->vma
3445 + got_offset),
3446 plt->contents + iplt_offset + 24);
3447 }
3448 else if (got_offset < 4096)
3449 {
3450 /* The GOT offset is small enough to be used directly as
3451 displacement. */
3452 memcpy (plt->contents + iplt_offset,
3453 elf_s390_plt_pic12_entry,
3454 PLT_ENTRY_SIZE);
3455
3456 /* Put in the GOT offset as displacement value. The 0xc000
3457 value comes from the first word of the plt entry. Look
3458 at the elf_s390_plt_pic16_entry content. */
3459 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3460 plt->contents + iplt_offset + 2);
3461
3462 /* Adjust the jump to the first plt entry. */
3463 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3464 plt->contents + iplt_offset + 20);
3465 }
3466 else if (got_offset < 32768)
3467 {
3468 /* The GOT offset is too big for a displacement but small
3469 enough to be a signed 16 bit immediate value as it can be
3470 used in an lhi instruction. */
3471 memcpy (plt->contents + iplt_offset,
3472 elf_s390_plt_pic16_entry,
3473 PLT_ENTRY_SIZE);
3474
3475 /* Put in the GOT offset for the lhi instruction. */
3476 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3477 plt->contents + iplt_offset + 2);
3478
3479 /* Adjust the jump to the first plt entry. */
3480 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3481 plt->contents + iplt_offset + 20);
3482 }
3483 else
3484 {
3485 memcpy (plt->contents + iplt_offset,
3486 elf_s390_plt_pic_entry,
3487 PLT_ENTRY_SIZE);
3488
3489 /* Adjust the jump to the first plt entry. */
3490 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3491 plt->contents + iplt_offset + 20);
3492
3493 /* Push the GOT offset field. */
3494 bfd_put_32 (output_bfd, got_offset,
3495 plt->contents + iplt_offset + 24);
3496 }
3497 /* Insert offset into reloc. table here. */
3498 bfd_put_32 (output_bfd, relplt->output_offset +
3499 iplt_index * RELA_ENTRY_SIZE,
3500 plt->contents + iplt_offset + 28);
3501
3502 /* Fill in the entry in the global offset table.
3503 Points to instruction after GOT offset. */
3504 bfd_put_32 (output_bfd,
3505 (plt->output_section->vma
3506 + plt->output_offset
3507 + iplt_offset
3508 + 12),
3509 gotplt->contents + igotiplt_offset);
3510
3511 /* Fill in the entry in the .rela.plt section. */
3512 rela.r_offset = gotplt->output_section->vma + got_offset;
3513
3514 if (!h
3515 || h->dynindx == -1
3516 || ((bfd_link_executable (info)
3517 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3518 && h->def_regular))
3519 {
3520 /* The symbol can be locally resolved. */
3521 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3522 rela.r_addend = resolver_address;
3523 }
3524 else
3525 {
3526 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3527 rela.r_addend = 0;
3528 }
3529
3530 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3531 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3532 }
3533
3534 /* Finish up dynamic symbol handling. We set the contents of various
3535 dynamic sections here. */
3536
3537 static bfd_boolean
3538 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3539 struct bfd_link_info *info,
3540 struct elf_link_hash_entry *h,
3541 Elf_Internal_Sym *sym)
3542 {
3543 struct elf_s390_link_hash_table *htab;
3544 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3545
3546 htab = elf_s390_hash_table (info);
3547
3548 if (h->plt.offset != (bfd_vma) -1)
3549 {
3550 bfd_vma plt_index;
3551 bfd_vma got_offset;
3552 Elf_Internal_Rela rela;
3553 bfd_byte *loc;
3554 bfd_vma relative_offset;
3555
3556 /* This symbol has an entry in the procedure linkage table. Set
3557 it up. */
3558 if (s390_is_ifunc_symbol_p (h))
3559 {
3560 /* If we can resolve the IFUNC symbol locally we generate an
3561 IRELATIVE reloc. */
3562 elf_s390_finish_ifunc_symbol (output_bfd, info, h, htab, h->plt.offset,
3563 eh->ifunc_resolver_address +
3564 eh->ifunc_resolver_section->output_offset +
3565 eh->ifunc_resolver_section->output_section->vma);
3566 /* Fallthrough. Handling of explicit GOT slots of IFUNC
3567 symbols is below. */
3568 }
3569 else
3570 {
3571 if (h->dynindx == -1
3572 || htab->elf.splt == NULL
3573 || htab->elf.sgotplt == NULL
3574 || htab->elf.srelplt == NULL)
3575 abort ();
3576
3577 /* Calc. index no.
3578 Current offset - size first entry / entry size. */
3579 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3580
3581 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3582 addr & GOT addr. */
3583 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3584
3585 /* S390 uses halfwords for relative branch calc! */
3586 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3587 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3588 /* If offset is > 32768, branch to a previous branch
3589 390 can only handle +-64 K jumps. */
3590 if ( -32768 > (int) relative_offset )
3591 relative_offset
3592 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3593
3594 /* Fill in the entry in the procedure linkage table. */
3595 if (!bfd_link_pic (info))
3596 {
3597 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3598 PLT_ENTRY_SIZE);
3599
3600 /* Adjust jump to the first plt entry. */
3601 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3602 htab->elf.splt->contents + h->plt.offset + 20);
3603
3604 /* Push the GOT offset field. */
3605 bfd_put_32 (output_bfd,
3606 (htab->elf.sgotplt->output_section->vma
3607 + htab->elf.sgotplt->output_offset
3608 + got_offset),
3609 htab->elf.splt->contents + h->plt.offset + 24);
3610 }
3611 else if (got_offset < 4096)
3612 {
3613 /* The GOT offset is small enough to be used directly as
3614 displacement. */
3615 memcpy (htab->elf.splt->contents + h->plt.offset,
3616 elf_s390_plt_pic12_entry,
3617 PLT_ENTRY_SIZE);
3618
3619 /* Put in the GOT offset as displacement value. The 0xc000
3620 value comes from the first word of the plt entry. Look
3621 at the elf_s390_plt_pic16_entry content. */
3622 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3623 htab->elf.splt->contents + h->plt.offset + 2);
3624
3625 /* Adjust the jump to the first plt entry. */
3626 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3627 htab->elf.splt->contents + h->plt.offset + 20);
3628 }
3629 else if (got_offset < 32768)
3630 {
3631 /* The GOT offset is too big for a displacement but small
3632 enough to be a signed 16 bit immediate value as it can be
3633 used in an lhi instruction. */
3634 memcpy (htab->elf.splt->contents + h->plt.offset,
3635 elf_s390_plt_pic16_entry,
3636 PLT_ENTRY_SIZE);
3637
3638 /* Put in the GOT offset for the lhi instruction. */
3639 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3640 htab->elf.splt->contents + h->plt.offset + 2);
3641
3642 /* Adjust the jump to the first plt entry. */
3643 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3644 htab->elf.splt->contents + h->plt.offset + 20);
3645 }
3646 else
3647 {
3648 memcpy (htab->elf.splt->contents + h->plt.offset,
3649 elf_s390_plt_pic_entry,
3650 PLT_ENTRY_SIZE);
3651
3652 /* Adjust the jump to the first plt entry. */
3653 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3654 htab->elf.splt->contents + h->plt.offset + 20);
3655
3656 /* Push the GOT offset field. */
3657 bfd_put_32 (output_bfd, got_offset,
3658 htab->elf.splt->contents + h->plt.offset + 24);
3659 }
3660 /* Insert offset into reloc. table here. */
3661 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3662 htab->elf.splt->contents + h->plt.offset + 28);
3663
3664 /* Fill in the entry in the global offset table.
3665 Points to instruction after GOT offset. */
3666 bfd_put_32 (output_bfd,
3667 (htab->elf.splt->output_section->vma
3668 + htab->elf.splt->output_offset
3669 + h->plt.offset
3670 + 12),
3671 htab->elf.sgotplt->contents + got_offset);
3672
3673 /* Fill in the entry in the .rela.plt section. */
3674 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3675 + htab->elf.sgotplt->output_offset
3676 + got_offset);
3677 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3678 rela.r_addend = 0;
3679 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3680 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3681
3682 if (!h->def_regular)
3683 {
3684 /* Mark the symbol as undefined, rather than as defined in
3685 the .plt section. Leave the value alone. This is a clue
3686 for the dynamic linker, to make function pointer
3687 comparisons work between an application and shared
3688 library. */
3689 sym->st_shndx = SHN_UNDEF;
3690 }
3691 }
3692 }
3693
3694 if (h->got.offset != (bfd_vma) -1
3695 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3696 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3697 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3698 {
3699 Elf_Internal_Rela rela;
3700 bfd_byte *loc;
3701
3702 /* This symbol has an entry in the global offset table. Set it
3703 up. */
3704
3705 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3706 abort ();
3707
3708 rela.r_offset = (htab->elf.sgot->output_section->vma
3709 + htab->elf.sgot->output_offset
3710 + (h->got.offset &~ (bfd_vma) 1));
3711
3712 /* If this is a static link, or it is a -Bsymbolic link and the
3713 symbol is defined locally or was forced to be local because
3714 of a version file, we just want to emit a RELATIVE reloc.
3715 The entry in the global offset table will already have been
3716 initialized in the relocate_section function. */
3717 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3718 {
3719 if (bfd_link_pic (info))
3720 {
3721 /* An explicit GOT slot usage needs GLOB_DAT. If the
3722 symbol references local the implicit got.iplt slot
3723 will be used and the IRELATIVE reloc has been created
3724 above. */
3725 goto do_glob_dat;
3726 }
3727 else
3728 {
3729 /* For non-shared objects explicit GOT slots must be
3730 filled with the PLT slot address for pointer
3731 equality reasons. */
3732 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3733 + htab->elf.iplt->output_offset
3734 + h->plt.offset),
3735 htab->elf.sgot->contents + h->got.offset);
3736 return TRUE;
3737 }
3738 }
3739 else if (bfd_link_pic (info)
3740 && SYMBOL_REFERENCES_LOCAL (info, h))
3741 {
3742 /* If this is a static link, or it is a -Bsymbolic link and
3743 the symbol is defined locally or was forced to be local
3744 because of a version file, we just want to emit a
3745 RELATIVE reloc. The entry in the global offset table
3746 will already have been initialized in the
3747 relocate_section function. */
3748 if (!h->def_regular)
3749 return FALSE;
3750 BFD_ASSERT((h->got.offset & 1) != 0);
3751 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3752 rela.r_addend = (h->root.u.def.value
3753 + h->root.u.def.section->output_section->vma
3754 + h->root.u.def.section->output_offset);
3755 }
3756 else
3757 {
3758 BFD_ASSERT((h->got.offset & 1) == 0);
3759 do_glob_dat:
3760 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3761 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3762 rela.r_addend = 0;
3763 }
3764
3765 loc = htab->elf.srelgot->contents;
3766 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3767 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3768 }
3769
3770 if (h->needs_copy)
3771 {
3772 Elf_Internal_Rela rela;
3773 bfd_byte *loc;
3774
3775 /* This symbols needs a copy reloc. Set it up. */
3776
3777 if (h->dynindx == -1
3778 || (h->root.type != bfd_link_hash_defined
3779 && h->root.type != bfd_link_hash_defweak)
3780 || htab->srelbss == NULL)
3781 abort ();
3782
3783 rela.r_offset = (h->root.u.def.value
3784 + h->root.u.def.section->output_section->vma
3785 + h->root.u.def.section->output_offset);
3786 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3787 rela.r_addend = 0;
3788 loc = htab->srelbss->contents;
3789 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3790 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3791 }
3792
3793 /* Mark some specially defined symbols as absolute. */
3794 if (h == htab->elf.hdynamic
3795 || h == htab->elf.hgot
3796 || h == htab->elf.hplt)
3797 sym->st_shndx = SHN_ABS;
3798
3799 return TRUE;
3800 }
3801
3802 /* Used to decide how to sort relocs in an optimal manner for the
3803 dynamic linker, before writing them out. */
3804
3805 static enum elf_reloc_type_class
3806 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3807 const asection *rel_sec ATTRIBUTE_UNUSED,
3808 const Elf_Internal_Rela *rela)
3809 {
3810 switch ((int) ELF32_R_TYPE (rela->r_info))
3811 {
3812 case R_390_RELATIVE:
3813 return reloc_class_relative;
3814 case R_390_JMP_SLOT:
3815 return reloc_class_plt;
3816 case R_390_COPY:
3817 return reloc_class_copy;
3818 default:
3819 return reloc_class_normal;
3820 }
3821 }
3822
3823 /* Finish up the dynamic sections. */
3824
3825 static bfd_boolean
3826 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3827 struct bfd_link_info *info)
3828 {
3829 struct elf_s390_link_hash_table *htab;
3830 bfd *dynobj;
3831 asection *sdyn;
3832 bfd *ibfd;
3833 unsigned int i;
3834
3835 htab = elf_s390_hash_table (info);
3836 dynobj = htab->elf.dynobj;
3837 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3838
3839 if (htab->elf.dynamic_sections_created)
3840 {
3841 Elf32_External_Dyn *dyncon, *dynconend;
3842
3843 if (sdyn == NULL || htab->elf.sgot == NULL)
3844 abort ();
3845
3846 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3847 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3848 for (; dyncon < dynconend; dyncon++)
3849 {
3850 Elf_Internal_Dyn dyn;
3851 asection *s;
3852
3853 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3854
3855 switch (dyn.d_tag)
3856 {
3857 default:
3858 continue;
3859
3860 case DT_PLTGOT:
3861 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma;
3862 break;
3863
3864 case DT_JMPREL:
3865 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
3866 break;
3867
3868 case DT_PLTRELSZ:
3869 s = htab->elf.srelplt->output_section;
3870 dyn.d_un.d_val = s->size;
3871 break;
3872 }
3873
3874 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3875 }
3876
3877 /* Fill in the special first entry in the procedure linkage table. */
3878 if (htab->elf.splt && htab->elf.splt->size > 0)
3879 {
3880 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3881 if (bfd_link_pic (info))
3882 {
3883 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3884 PLT_FIRST_ENTRY_SIZE);
3885 }
3886 else
3887 {
3888 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3889 PLT_FIRST_ENTRY_SIZE);
3890 bfd_put_32 (output_bfd,
3891 htab->elf.sgotplt->output_section->vma
3892 + htab->elf.sgotplt->output_offset,
3893 htab->elf.splt->contents + 24);
3894 }
3895 elf_section_data (htab->elf.splt->output_section)
3896 ->this_hdr.sh_entsize = 4;
3897 }
3898
3899 }
3900
3901 if (htab->elf.sgotplt)
3902 {
3903 /* Fill in the first three entries in the global offset table. */
3904 if (htab->elf.sgotplt->size > 0)
3905 {
3906 bfd_put_32 (output_bfd,
3907 (sdyn == NULL ? (bfd_vma) 0
3908 : sdyn->output_section->vma + sdyn->output_offset),
3909 htab->elf.sgotplt->contents);
3910 /* One entry for shared object struct ptr. */
3911 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3912 /* One entry for _dl_runtime_resolve. */
3913 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3914 }
3915
3916 elf_section_data (htab->elf.sgotplt->output_section)
3917 ->this_hdr.sh_entsize = 4;
3918 }
3919 /* Finish dynamic symbol for local IFUNC symbols. */
3920 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3921 {
3922 struct plt_entry *local_plt;
3923 Elf_Internal_Sym *isym;
3924 Elf_Internal_Shdr *symtab_hdr;
3925
3926 symtab_hdr = &elf_symtab_hdr (ibfd);
3927
3928 local_plt = elf_s390_local_plt (ibfd);
3929 if (local_plt != NULL)
3930 for (i = 0; i < symtab_hdr->sh_info; i++)
3931 {
3932 if (local_plt[i].plt.offset != (bfd_vma) -1)
3933 {
3934 asection *sec = local_plt[i].sec;
3935 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3936 if (isym == NULL)
3937 return FALSE;
3938
3939 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3940 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3941 local_plt[i].plt.offset,
3942 isym->st_value
3943 + sec->output_section->vma
3944 + sec->output_offset);
3945
3946 }
3947 }
3948 }
3949 return TRUE;
3950 }
3951
3952 static bfd_boolean
3953 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3954 {
3955 int offset;
3956 unsigned int size;
3957
3958 switch (note->descsz)
3959 {
3960 default:
3961 return FALSE;
3962
3963 case 224: /* S/390 Linux. */
3964 /* pr_cursig */
3965 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3966
3967 /* pr_pid */
3968 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
3969
3970 /* pr_reg */
3971 offset = 72;
3972 size = 144;
3973 break;
3974 }
3975
3976 /* Make a ".reg/999" section. */
3977 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3978 size, note->descpos + offset);
3979 }
3980
3981 /* Return address for Ith PLT stub in section PLT, for relocation REL
3982 or (bfd_vma) -1 if it should not be included. */
3983
3984 static bfd_vma
3985 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3986 const arelent *rel ATTRIBUTE_UNUSED)
3987 {
3988 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3989 }
3990
3991 /* Merge backend specific data from an object file to the output
3992 object file when linking. */
3993
3994 static bfd_boolean
3995 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3996 {
3997 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
3998 return TRUE;
3999
4000 if (!elf_s390_merge_obj_attributes (ibfd, obfd))
4001 return FALSE;
4002
4003 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
4004 return TRUE;
4005 }
4006
4007
4008 #define TARGET_BIG_SYM s390_elf32_vec
4009 #define TARGET_BIG_NAME "elf32-s390"
4010 #define ELF_ARCH bfd_arch_s390
4011 #define ELF_TARGET_ID S390_ELF_DATA
4012 #define ELF_MACHINE_CODE EM_S390
4013 #define ELF_MACHINE_ALT1 EM_S390_OLD
4014 #define ELF_MAXPAGESIZE 0x1000
4015
4016 #define elf_backend_can_gc_sections 1
4017 #define elf_backend_can_refcount 1
4018 #define elf_backend_want_got_plt 1
4019 #define elf_backend_plt_readonly 1
4020 #define elf_backend_want_plt_sym 0
4021 #define elf_backend_got_header_size 12
4022 #define elf_backend_rela_normal 1
4023
4024 #define elf_info_to_howto elf_s390_info_to_howto
4025
4026 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
4027 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
4028 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
4029 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
4030
4031 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
4032
4033 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
4034 #define elf_backend_check_relocs elf_s390_check_relocs
4035 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
4036 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
4037 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
4038 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
4039 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
4040 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
4041 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
4042 #define elf_backend_relocate_section elf_s390_relocate_section
4043 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
4044 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4045 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
4046 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
4047 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
4048 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
4049
4050 #define bfd_elf32_mkobject elf_s390_mkobject
4051 #define elf_backend_object_p elf_s390_object_p
4052
4053 #include "elf32-target.h"
GDB Binutils - Deliverables
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