1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright (C) 2000-2024 Free Software Foundation, Inc.
3 Contributed by Carl B. Pedersen and Martin Schwidefsky.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/s390.h"
28 #include <stdarg.h>
29
30 static bfd_reloc_status_type
31 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
32 asection *, bfd *, char **);
33 static bfd_reloc_status_type
34 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
35 asection *, bfd *, char **);
36
37 /* The relocation "howto" table. */
38
39 static reloc_howto_type elf_howto_table[] =
40 {
41 HOWTO (R_390_NONE, /* type */
42 0, /* rightshift */
43 0, /* size */
44 0, /* bitsize */
45 false, /* pc_relative */
46 0, /* bitpos */
47 complain_overflow_dont, /* complain_on_overflow */
48 bfd_elf_generic_reloc, /* special_function */
49 "R_390_NONE", /* name */
50 false, /* partial_inplace */
51 0, /* src_mask */
52 0, /* dst_mask */
53 false), /* pcrel_offset */
54
55 HOWTO(R_390_8, 0, 1, 8, false, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
57 HOWTO(R_390_12, 0, 2, 12, false, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
59 HOWTO(R_390_16, 0, 2, 16, false, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
61 HOWTO(R_390_32, 0, 4, 32, false, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
63 HOWTO(R_390_PC32, 0, 4, 32, true, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
65 HOWTO(R_390_GOT12, 0, 2, 12, false, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
67 HOWTO(R_390_GOT32, 0, 4, 32, false, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
69 HOWTO(R_390_PLT32, 0, 4, 32, true, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
71 HOWTO(R_390_COPY, 0, 4, 32, false, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
73 HOWTO(R_390_GLOB_DAT, 0, 4, 32, false, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_GLOB_DAT", false, 0,0xffffffff, false),
75 HOWTO(R_390_JMP_SLOT, 0, 4, 32, false, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_390_JMP_SLOT", false, 0,0xffffffff, false),
77 HOWTO(R_390_RELATIVE, 0, 4, 32, true, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_390_RELATIVE", false, 0,0xffffffff, false),
79 HOWTO(R_390_GOTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_390_GOTOFF32", false, 0,0xffffffff, false),
81 HOWTO(R_390_GOTPC, 0, 4, 32, true, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
83 HOWTO(R_390_GOT16, 0, 2, 16, false, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
85 HOWTO(R_390_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
87 HOWTO(R_390_PC16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
89 HOWTO(R_390_PLT16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
91 HOWTO(R_390_PC32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
93 HOWTO(R_390_PLT32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
95 HOWTO(R_390_GOTPCDBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,0xffffffff, true),
97 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
98 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
99 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
100 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
101 HOWTO(R_390_GOTENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,0xffffffff, true),
103 HOWTO(R_390_GOTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_390_GOTOFF16", false, 0,0x0000ffff, false),
105 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
106 HOWTO(R_390_GOTPLT12, 0, 2, 12, false, 0, complain_overflow_dont,
107 bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false),
108 HOWTO(R_390_GOTPLT16, 0, 2, 16, false, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false),
110 HOWTO(R_390_GOTPLT32, 0, 4, 32, false, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_390_GOTPLT32", false, 0,0xffffffff, false),
112 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
113 HOWTO(R_390_GOTPLTENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_390_GOTPLTENT",false, 0,0xffffffff, true),
115 HOWTO(R_390_PLTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false),
117 HOWTO(R_390_PLTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_PLTOFF32", false, 0,0xffffffff, false),
119 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
120 HOWTO(R_390_TLS_LOAD, 0, 0, 0, false, 0, complain_overflow_dont,
121 s390_tls_reloc, "R_390_TLS_LOAD", false, 0, 0, false),
122 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
123 s390_tls_reloc, "R_390_TLS_GDCALL", false, 0, 0, false),
124 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
125 s390_tls_reloc, "R_390_TLS_LDCALL", false, 0, 0, false),
126 HOWTO(R_390_TLS_GD32, 0, 4, 32, false, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_TLS_GD32", false, 0, 0xffffffff, false),
128 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
129 HOWTO(R_390_TLS_GOTIE12, 0, 2, 12, false, 0, complain_overflow_dont,
130 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", false, 0, 0x00000fff, false),
131 HOWTO(R_390_TLS_GOTIE32, 0, 4, 32, false, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", false, 0, 0xffffffff, false),
133 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
134 HOWTO(R_390_TLS_LDM32, 0, 4, 32, false, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_TLS_LDM32", false, 0, 0xffffffff, false),
136 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
137 HOWTO(R_390_TLS_IE32, 0, 4, 32, false, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_TLS_IE32", false, 0, 0xffffffff, false),
139 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
140 HOWTO(R_390_TLS_IEENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_TLS_IEENT", false, 0, 0xffffffff, true),
142 HOWTO(R_390_TLS_LE32, 0, 4, 32, false, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_TLS_LE32", false, 0, 0xffffffff, false),
144 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
145 HOWTO(R_390_TLS_LDO32, 0, 4, 32, false, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_TLS_LDO32", false, 0, 0xffffffff, false),
147 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
148 HOWTO(R_390_TLS_DTPMOD, 0, 4, 32, false, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", false, 0, 0xffffffff, false),
150 HOWTO(R_390_TLS_DTPOFF, 0, 4, 32, false, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", false, 0, 0xffffffff, false),
152 HOWTO(R_390_TLS_TPOFF, 0, 4, 32, false, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", false, 0, 0xffffffff, false),
154 HOWTO(R_390_20, 0, 4, 20, false, 8, complain_overflow_dont,
155 s390_elf_ldisp_reloc, "R_390_20", false, 0,0x0fffff00, false),
156 HOWTO(R_390_GOT20, 0, 4, 20, false, 8, complain_overflow_dont,
157 s390_elf_ldisp_reloc, "R_390_GOT20", false, 0,0x0fffff00, false),
158 HOWTO(R_390_GOTPLT20, 0, 4, 20, false, 8, complain_overflow_dont,
159 s390_elf_ldisp_reloc, "R_390_GOTPLT20", false, 0,0x0fffff00, false),
160 HOWTO(R_390_TLS_GOTIE20, 0, 4, 20, false, 8, complain_overflow_dont,
161 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", false, 0,0x0fffff00, false),
162 HOWTO(R_390_IRELATIVE, 0, 4, 32, true, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_IRELATIVE", false, 0, 0xffffffff, false),
164 HOWTO(R_390_PC12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PC12DBL", false, 0,0x00000fff, true),
166 HOWTO(R_390_PLT12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true),
168 HOWTO(R_390_PC24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_PC24DBL", false, 0,0x00ffffff, true),
170 HOWTO(R_390_PLT24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_PLT24DBL", false, 0,0x00ffffff, true),
172 };
173
174 /* GNU extension to record C++ vtable hierarchy. */
175 static reloc_howto_type elf32_s390_vtinherit_howto =
176 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
177 static reloc_howto_type elf32_s390_vtentry_howto =
178 HOWTO (R_390_GNU_VTENTRY, 0,4,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
179
180 static reloc_howto_type *
elf_s390_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)181 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
182 bfd_reloc_code_real_type code)
183 {
184 switch (code)
185 {
186 case BFD_RELOC_NONE:
187 return &elf_howto_table[(int) R_390_NONE];
188 case BFD_RELOC_8:
189 return &elf_howto_table[(int) R_390_8];
190 case BFD_RELOC_390_12:
191 return &elf_howto_table[(int) R_390_12];
192 case BFD_RELOC_16:
193 return &elf_howto_table[(int) R_390_16];
194 case BFD_RELOC_32:
195 return &elf_howto_table[(int) R_390_32];
196 case BFD_RELOC_CTOR:
197 return &elf_howto_table[(int) R_390_32];
198 case BFD_RELOC_32_PCREL:
199 return &elf_howto_table[(int) R_390_PC32];
200 case BFD_RELOC_390_GOT12:
201 return &elf_howto_table[(int) R_390_GOT12];
202 case BFD_RELOC_32_GOT_PCREL:
203 return &elf_howto_table[(int) R_390_GOT32];
204 case BFD_RELOC_390_PLT32:
205 return &elf_howto_table[(int) R_390_PLT32];
206 case BFD_RELOC_390_COPY:
207 return &elf_howto_table[(int) R_390_COPY];
208 case BFD_RELOC_390_GLOB_DAT:
209 return &elf_howto_table[(int) R_390_GLOB_DAT];
210 case BFD_RELOC_390_JMP_SLOT:
211 return &elf_howto_table[(int) R_390_JMP_SLOT];
212 case BFD_RELOC_390_RELATIVE:
213 return &elf_howto_table[(int) R_390_RELATIVE];
214 case BFD_RELOC_32_GOTOFF:
215 return &elf_howto_table[(int) R_390_GOTOFF32];
216 case BFD_RELOC_390_GOTPC:
217 return &elf_howto_table[(int) R_390_GOTPC];
218 case BFD_RELOC_390_GOT16:
219 return &elf_howto_table[(int) R_390_GOT16];
220 case BFD_RELOC_16_PCREL:
221 return &elf_howto_table[(int) R_390_PC16];
222 case BFD_RELOC_390_PC12DBL:
223 return &elf_howto_table[(int) R_390_PC12DBL];
224 case BFD_RELOC_390_PLT12DBL:
225 return &elf_howto_table[(int) R_390_PLT12DBL];
226 case BFD_RELOC_390_PC16DBL:
227 return &elf_howto_table[(int) R_390_PC16DBL];
228 case BFD_RELOC_390_PLT16DBL:
229 return &elf_howto_table[(int) R_390_PLT16DBL];
230 case BFD_RELOC_390_PC24DBL:
231 return &elf_howto_table[(int) R_390_PC24DBL];
232 case BFD_RELOC_390_PLT24DBL:
233 return &elf_howto_table[(int) R_390_PLT24DBL];
234 case BFD_RELOC_390_PC32DBL:
235 return &elf_howto_table[(int) R_390_PC32DBL];
236 case BFD_RELOC_390_PLT32DBL:
237 return &elf_howto_table[(int) R_390_PLT32DBL];
238 case BFD_RELOC_390_GOTPCDBL:
239 return &elf_howto_table[(int) R_390_GOTPCDBL];
240 case BFD_RELOC_390_GOTENT:
241 return &elf_howto_table[(int) R_390_GOTENT];
242 case BFD_RELOC_16_GOTOFF:
243 return &elf_howto_table[(int) R_390_GOTOFF16];
244 case BFD_RELOC_390_GOTPLT12:
245 return &elf_howto_table[(int) R_390_GOTPLT12];
246 case BFD_RELOC_390_GOTPLT16:
247 return &elf_howto_table[(int) R_390_GOTPLT16];
248 case BFD_RELOC_390_GOTPLT32:
249 return &elf_howto_table[(int) R_390_GOTPLT32];
250 case BFD_RELOC_390_GOTPLTENT:
251 return &elf_howto_table[(int) R_390_GOTPLTENT];
252 case BFD_RELOC_390_PLTOFF16:
253 return &elf_howto_table[(int) R_390_PLTOFF16];
254 case BFD_RELOC_390_PLTOFF32:
255 return &elf_howto_table[(int) R_390_PLTOFF32];
256 case BFD_RELOC_390_TLS_LOAD:
257 return &elf_howto_table[(int) R_390_TLS_LOAD];
258 case BFD_RELOC_390_TLS_GDCALL:
259 return &elf_howto_table[(int) R_390_TLS_GDCALL];
260 case BFD_RELOC_390_TLS_LDCALL:
261 return &elf_howto_table[(int) R_390_TLS_LDCALL];
262 case BFD_RELOC_390_TLS_GD32:
263 return &elf_howto_table[(int) R_390_TLS_GD32];
264 case BFD_RELOC_390_TLS_GOTIE12:
265 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
266 case BFD_RELOC_390_TLS_GOTIE32:
267 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
268 case BFD_RELOC_390_TLS_LDM32:
269 return &elf_howto_table[(int) R_390_TLS_LDM32];
270 case BFD_RELOC_390_TLS_IE32:
271 return &elf_howto_table[(int) R_390_TLS_IE32];
272 case BFD_RELOC_390_TLS_IEENT:
273 return &elf_howto_table[(int) R_390_TLS_IEENT];
274 case BFD_RELOC_390_TLS_LE32:
275 return &elf_howto_table[(int) R_390_TLS_LE32];
276 case BFD_RELOC_390_TLS_LDO32:
277 return &elf_howto_table[(int) R_390_TLS_LDO32];
278 case BFD_RELOC_390_TLS_DTPMOD:
279 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
280 case BFD_RELOC_390_TLS_DTPOFF:
281 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
282 case BFD_RELOC_390_TLS_TPOFF:
283 return &elf_howto_table[(int) R_390_TLS_TPOFF];
284 case BFD_RELOC_390_20:
285 return &elf_howto_table[(int) R_390_20];
286 case BFD_RELOC_390_GOT20:
287 return &elf_howto_table[(int) R_390_GOT20];
288 case BFD_RELOC_390_GOTPLT20:
289 return &elf_howto_table[(int) R_390_GOTPLT20];
290 case BFD_RELOC_390_TLS_GOTIE20:
291 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
292 case BFD_RELOC_390_IRELATIVE:
293 return &elf_howto_table[(int) R_390_IRELATIVE];
294 case BFD_RELOC_VTABLE_INHERIT:
295 return &elf32_s390_vtinherit_howto;
296 case BFD_RELOC_VTABLE_ENTRY:
297 return &elf32_s390_vtentry_howto;
298 default:
299 break;
300 }
301 return 0;
302 }
303
304 static reloc_howto_type *
elf_s390_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)305 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
306 const char *r_name)
307 {
308 unsigned int i;
309
310 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
311 if (elf_howto_table[i].name != NULL
312 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
313 return &elf_howto_table[i];
314
315 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
316 return &elf32_s390_vtinherit_howto;
317 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
318 return &elf32_s390_vtentry_howto;
319
320 return NULL;
321 }
322
323 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
324 and elf32-s390.c has its own copy. */
325
326 static bool
elf_s390_info_to_howto(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)327 elf_s390_info_to_howto (bfd *abfd,
328 arelent *cache_ptr,
329 Elf_Internal_Rela *dst)
330 {
331 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
332
333 switch (r_type)
334 {
335 case R_390_GNU_VTINHERIT:
336 cache_ptr->howto = &elf32_s390_vtinherit_howto;
337 break;
338
339 case R_390_GNU_VTENTRY:
340 cache_ptr->howto = &elf32_s390_vtentry_howto;
341 break;
342
343 default:
344 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
345 {
346 /* xgettext:c-format */
347 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
348 abfd, r_type);
349 bfd_set_error (bfd_error_bad_value);
350 return false;
351 }
352 cache_ptr->howto = &elf_howto_table[r_type];
353 }
354
355 return true;
356 }
357
358 /* A relocation function which doesn't do anything. */
359 static bfd_reloc_status_type
s390_tls_reloc(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry,asymbol * symbol ATTRIBUTE_UNUSED,void * data ATTRIBUTE_UNUSED,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)360 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
361 arelent *reloc_entry,
362 asymbol *symbol ATTRIBUTE_UNUSED,
363 void * data ATTRIBUTE_UNUSED,
364 asection *input_section,
365 bfd *output_bfd,
366 char **error_message ATTRIBUTE_UNUSED)
367 {
368 if (output_bfd)
369 reloc_entry->address += input_section->output_offset;
370 return bfd_reloc_ok;
371 }
372
373 /* Handle the large displacement relocs. */
374 static bfd_reloc_status_type
s390_elf_ldisp_reloc(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry,asymbol * symbol,void * data ATTRIBUTE_UNUSED,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)375 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED,
376 arelent *reloc_entry,
377 asymbol *symbol,
378 void * data ATTRIBUTE_UNUSED,
379 asection *input_section,
380 bfd *output_bfd,
381 char **error_message ATTRIBUTE_UNUSED)
382 {
383 reloc_howto_type *howto = reloc_entry->howto;
384 bfd_vma relocation;
385 bfd_vma insn;
386
387 if (output_bfd != (bfd *) NULL
388 && (symbol->flags & BSF_SECTION_SYM) == 0
389 && (! howto->partial_inplace
390 || reloc_entry->addend == 0))
391 {
392 reloc_entry->address += input_section->output_offset;
393 return bfd_reloc_ok;
394 }
395
396 if (output_bfd != NULL)
397 return bfd_reloc_continue;
398
399 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
400 return bfd_reloc_outofrange;
401
402 relocation = (symbol->value
403 + symbol->section->output_section->vma
404 + symbol->section->output_offset);
405 relocation += reloc_entry->addend;
406 if (howto->pc_relative)
407 {
408 relocation -= (input_section->output_section->vma
409 + input_section->output_offset);
410 relocation -= reloc_entry->address;
411 }
412
413 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
414 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
415 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
416
417 if ((bfd_signed_vma) relocation < - 0x80000
418 || (bfd_signed_vma) relocation > 0x7ffff)
419 return bfd_reloc_overflow;
420 else
421 return bfd_reloc_ok;
422 }
423
424 static bool
elf_s390_is_local_label_name(bfd * abfd,const char * name)425 elf_s390_is_local_label_name (bfd *abfd, const char *name)
426 {
427 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
428 return true;
429
430 return _bfd_elf_is_local_label_name (abfd, name);
431 }
432
433 /* Functions for the 390 ELF linker. */
434
435 /* The name of the dynamic interpreter. This is put in the .interp
436 section. */
437
438 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
439
440 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
441 copying dynamic variables from a shared lib into an app's dynbss
442 section, and instead use a dynamic relocation to point into the
443 shared lib. */
444 #define ELIMINATE_COPY_RELOCS 1
445
446 /* The size in bytes of the first entry in the procedure linkage table. */
447 #define PLT_FIRST_ENTRY_SIZE 32
448 /* The size in bytes of an entry in the procedure linkage table. */
449 #define PLT_ENTRY_SIZE 32
450
451 #define GOT_ENTRY_SIZE 4
452
453 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela)
454
455 /* The first three entries in a procedure linkage table are reserved,
456 and the initial contents are unimportant (we zero them out).
457 Subsequent entries look like this. See the SVR4 ABI 386
458 supplement to see how this works. */
459
460 /* For the s390, simple addr offset can only be 0 - 4096.
461 To use the full 2 GB address space, several instructions
462 are needed to load an address in a register and execute
463 a branch( or just saving the address)
464
465 Furthermore, only r 0 and 1 are free to use!!! */
466
467 /* The first 3 words in the GOT are then reserved.
468 Word 0 is the address of the dynamic table.
469 Word 1 is a pointer to a structure describing the object
470 Word 2 is used to point to the loader entry address.
471
472 The code for position independent PLT entries looks like this:
473
474 r12 holds addr of the current GOT at entry to the PLT
475
476 The GOT holds the address in the PLT to be executed.
477 The loader then gets:
478 24(15) = Pointer to the structure describing the object.
479 28(15) = Offset into rela.plt
480
481 The loader must then find the module where the function is
482 and insert the address in the GOT.
483
484 Note: 390 can only address +- 64 K relative.
485 We check if offset > 65536, then make a relative branch -64xxx
486 back to a previous defined branch
487
488 PLT1: BASR 1,0 # 2 bytes
489 L 1,22(1) # 4 bytes Load offset in GOT in r 1
490 L 1,(1,12) # 4 bytes Load address from GOT in r1
491 BCR 15,1 # 2 bytes Jump to address
492 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
493 L 1,14(1) # 4 bytes Load offset in symol table in r1
494 BRC 15,-x # 4 bytes Jump to start of PLT
495 .word 0 # 2 bytes filler
496 .long ? # 4 bytes offset in GOT
497 .long ? # 4 bytes offset into rela.plt
498
499 This was the general case. There are two additional, optimizes PLT
500 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
501 First the one for GOT offsets < 4096:
502
503 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
504 BCR 15,1 # 2 bytes Jump to address
505 .word 0,0,0 # 6 bytes filler
506 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
507 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
508 BRC 15,-x # 4 bytes Jump to start of PLT
509 .word 0,0,0 # 6 bytes filler
510 .long ? # 4 bytes offset into rela.plt
511
512 Second the one for GOT offsets < 32768:
513
514 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
515 L 1,(1,12) # 4 bytes Load address from GOT to r1
516 BCR 15,1 # 2 bytes Jump to address
517 .word 0 # 2 bytes filler
518 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
519 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
520 BRC 15,-x # 4 bytes Jump to start of PLT
521 .word 0,0,0 # 6 bytes filler
522 .long ? # 4 bytes offset into rela.plt
523
524 Total = 32 bytes per PLT entry
525
526 The code for static build PLT entries looks like this:
527
528 PLT1: BASR 1,0 # 2 bytes
529 L 1,22(1) # 4 bytes Load address of GOT entry
530 L 1,0(0,1) # 4 bytes Load address from GOT in r1
531 BCR 15,1 # 2 bytes Jump to address
532 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
533 L 1,14(1) # 4 bytes Load offset in symbol table in r1
534 BRC 15,-x # 4 bytes Jump to start of PLT
535 .word 0 # 2 bytes filler
536 .long ? # 4 bytes address of GOT entry
537 .long ? # 4 bytes offset into rela.plt */
538
539 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] =
540 {
541 0x0d, 0x10, /* basr %r1,%r0 */
542 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
543 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */
544 0x07, 0xf1, /* br %r1 */
545 0x0d, 0x10, /* basr %r1,%r0 */
546 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
547 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
548 0x00, 0x00, /* padding */
549 0x00, 0x00, 0x00, 0x00, /* GOT offset */
550 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
551 };
552
553 /* Generic PLT pic entry. */
554 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] =
555 {
556 0x0d, 0x10, /* basr %r1,%r0 */
557 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
558 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
559 0x07, 0xf1, /* br %r1 */
560 0x0d, 0x10, /* basr %r1,%r0 */
561 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
562 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
563 0x00, 0x00, /* padding */
564 0x00, 0x00, 0x00, 0x00, /* GOT offset */
565 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
566 };
567
568 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced
569 when generating the PLT slot with the GOT offset. */
570 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] =
571 {
572 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */
573 0x07, 0xf1, /* br %r1 */
574 0x00, 0x00, 0x00, 0x00, /* padding */
575 0x00, 0x00,
576 0x0d, 0x10, /* basr %r1,%r0 */
577 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
578 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
579 0x00, 0x00, 0x00, 0x00,
580 0x00, 0x00, 0x00, 0x00
581 };
582
583 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced
584 when generating the PLT slot with the GOT offset. */
585 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] =
586 {
587 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */
588 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
589 0x07, 0xf1, /* br %r1 */
590 0x00, 0x00,
591 0x0d, 0x10, /* basr %r1,%r0 */
592 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
593 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
594 0x00, 0x00, 0x00, 0x00,
595 0x00, 0x00, 0x00, 0x00,
596 0x00, 0x00
597 };
598
599 /* The first PLT entry pushes the offset into the rela.plt
600 from R1 onto the stack at 8(15) and the loader object info
601 at 12(15), loads the loader address in R1 and jumps to it. */
602
603 /* The first entry in the PLT for PIC code:
604
605 PLT0:
606 ST 1,28(15) # R1 has offset into rela.plt
607 L 1,4(12) # Get loader ino(object struct address)
608 ST 1,24(15) # Store address
609 L 1,8(12) # Entry address of loader in R1
610 BR 1 # Jump to loader
611
612 The first entry in the PLT for static code:
613
614 PLT0:
615 ST 1,28(15) # R1 has offset into rela.plt
616 BASR 1,0
617 L 1,18(0,1) # Get address of GOT
618 MVC 24(4,15),4(1) # Move loader ino to stack
619 L 1,8(1) # Get address of loader
620 BR 1 # Jump to loader
621 .word 0 # filler
622 .long got # address of GOT */
623
624 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] =
625 {
626 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
627 0x0d, 0x10, /* basr %r1,%r0 */
628 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */
629 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */
630 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */
631 0x07, 0xf1, /* br %r1 */
632 0x00, 0x00, 0x00, 0x00,
633 0x00, 0x00, 0x00, 0x00,
634 0x00, 0x00
635 };
636
637 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] =
638 {
639 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
640 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */
641 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */
642 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */
643 0x07, 0xf1, /* br %r1 */
644 0x00, 0x00, 0x00, 0x00,
645 0x00, 0x00, 0x00, 0x00,
646 0x00, 0x00, 0x00, 0x00,
647 0x00, 0x00
648 };
649
650
651 /* s390 ELF linker hash entry. */
652
653 struct elf_s390_link_hash_entry
654 {
655 struct elf_link_hash_entry elf;
656
657 /* Number of GOTPLT references for a function. */
658 bfd_signed_vma gotplt_refcount;
659
660 #define GOT_UNKNOWN 0
661 #define GOT_NORMAL 1
662 #define GOT_TLS_GD 2
663 #define GOT_TLS_IE 3
664 #define GOT_TLS_IE_NLT 4
665 unsigned char tls_type;
666
667 /* For pointer equality reasons we might need to change the symbol
668 type from STT_GNU_IFUNC to STT_FUNC together with its value and
669 section entry. So after alloc_dynrelocs only these values should
670 be used. In order to check whether a symbol is IFUNC use
671 s390_is_ifunc_symbol_p. */
672 bfd_vma ifunc_resolver_address;
673 asection *ifunc_resolver_section;
674 };
675
676 #define elf_s390_hash_entry(ent) \
677 ((struct elf_s390_link_hash_entry *)(ent))
678
679 /* This structure represents an entry in the local PLT list needed for
680 local IFUNC symbols. */
681 struct plt_entry
682 {
683 /* The section of the local symbol.
684 Set in relocate_section and used in finish_dynamic_sections. */
685 asection *sec;
686
687 union
688 {
689 bfd_signed_vma refcount;
690 bfd_vma offset;
691 } plt;
692 };
693
694 /* NOTE: Keep this structure in sync with
695 the one declared in elf64-s390.c. */
696 struct elf_s390_obj_tdata
697 {
698 struct elf_obj_tdata root;
699
700 /* A local PLT is needed for ifunc symbols. */
701 struct plt_entry *local_plt;
702
703 /* TLS type for each local got entry. */
704 char *local_got_tls_type;
705 };
706
707 #define elf_s390_tdata(abfd) \
708 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
709
710 #define elf_s390_local_plt(abfd) \
711 (elf_s390_tdata (abfd)->local_plt)
712
713 #define elf_s390_local_got_tls_type(abfd) \
714 (elf_s390_tdata (abfd)->local_got_tls_type)
715
716 #define is_s390_elf(bfd) \
717 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
718 && elf_tdata (bfd) != NULL \
719 && elf_object_id (bfd) == S390_ELF_DATA)
720
721 static bool
elf_s390_mkobject(bfd * abfd)722 elf_s390_mkobject (bfd *abfd)
723 {
724 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
725 S390_ELF_DATA);
726 }
727
728 static bool
elf_s390_object_p(bfd * abfd)729 elf_s390_object_p (bfd *abfd)
730 {
731 /* Set the right machine number for an s390 elf32 file. */
732 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
733 }
734
735 /* s390 ELF linker hash table. */
736
737 struct elf_s390_link_hash_table
738 {
739 struct elf_link_hash_table elf;
740
741 /* Short-cuts to get to dynamic linker sections. */
742 asection *irelifunc;
743
744 union
745 {
746 bfd_signed_vma refcount;
747 bfd_vma offset;
748 } tls_ldm_got;
749 };
750
751 /* Get the s390 ELF linker hash table from a link_info structure. */
752
753 #define elf_s390_hash_table(p) \
754 ((is_elf_hash_table ((p)->hash) \
755 && elf_hash_table_id (elf_hash_table (p)) == S390_ELF_DATA) \
756 ? (struct elf_s390_link_hash_table *) (p)->hash : NULL)
757
758 #undef ELF64
759 #include "elf-s390-common.c"
760
761 /* Create an entry in an s390 ELF linker hash table. */
762
763 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)764 link_hash_newfunc (struct bfd_hash_entry *entry,
765 struct bfd_hash_table *table,
766 const char *string)
767 {
768 /* Allocate the structure if it has not already been allocated by a
769 subclass. */
770 if (entry == NULL)
771 {
772 entry = bfd_hash_allocate (table,
773 sizeof (struct elf_s390_link_hash_entry));
774 if (entry == NULL)
775 return entry;
776 }
777
778 /* Call the allocation method of the superclass. */
779 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
780 if (entry != NULL)
781 {
782 struct elf_s390_link_hash_entry *eh;
783
784 eh = (struct elf_s390_link_hash_entry *) entry;
785 eh->gotplt_refcount = 0;
786 eh->tls_type = GOT_UNKNOWN;
787 eh->ifunc_resolver_address = 0;
788 eh->ifunc_resolver_section = NULL;
789 }
790
791 return entry;
792 }
793
794 /* Create an s390 ELF linker hash table. */
795
796 static struct bfd_link_hash_table *
elf_s390_link_hash_table_create(bfd * abfd)797 elf_s390_link_hash_table_create (bfd *abfd)
798 {
799 struct elf_s390_link_hash_table *ret;
800 size_t amt = sizeof (struct elf_s390_link_hash_table);
801
802 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
803 if (ret == NULL)
804 return NULL;
805
806 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
807 sizeof (struct elf_s390_link_hash_entry),
808 S390_ELF_DATA))
809 {
810 free (ret);
811 return NULL;
812 }
813
814 return &ret->elf.root;
815 }
816
817 /* Copy the extra info we tack onto an elf_link_hash_entry. */
818
819 static void
elf_s390_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)820 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
821 struct elf_link_hash_entry *dir,
822 struct elf_link_hash_entry *ind)
823 {
824 struct elf_s390_link_hash_entry *edir, *eind;
825
826 edir = (struct elf_s390_link_hash_entry *) dir;
827 eind = (struct elf_s390_link_hash_entry *) ind;
828
829 if (ind->root.type == bfd_link_hash_indirect
830 && dir->got.refcount <= 0)
831 {
832 edir->tls_type = eind->tls_type;
833 eind->tls_type = GOT_UNKNOWN;
834 }
835
836 if (ELIMINATE_COPY_RELOCS
837 && ind->root.type != bfd_link_hash_indirect
838 && dir->dynamic_adjusted)
839 {
840 /* If called to transfer flags for a weakdef during processing
841 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
842 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
843 if (dir->versioned != versioned_hidden)
844 dir->ref_dynamic |= ind->ref_dynamic;
845 dir->ref_regular |= ind->ref_regular;
846 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
847 dir->needs_plt |= ind->needs_plt;
848 }
849 else
850 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
851 }
852
853 static int
elf_s390_tls_transition(struct bfd_link_info * info,int r_type,int is_local)854 elf_s390_tls_transition (struct bfd_link_info *info,
855 int r_type,
856 int is_local)
857 {
858 if (bfd_link_pic (info))
859 return r_type;
860
861 switch (r_type)
862 {
863 case R_390_TLS_GD32:
864 case R_390_TLS_IE32:
865 if (is_local)
866 return R_390_TLS_LE32;
867 return R_390_TLS_IE32;
868 case R_390_TLS_GOTIE32:
869 if (is_local)
870 return R_390_TLS_LE32;
871 return R_390_TLS_GOTIE32;
872 case R_390_TLS_LDM32:
873 return R_390_TLS_LE32;
874 }
875
876 return r_type;
877 }
878
879 /* Look through the relocs for a section during the first phase, and
880 allocate space in the global offset table or procedure linkage
881 table. */
882
883 static bool
elf_s390_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)884 elf_s390_check_relocs (bfd *abfd,
885 struct bfd_link_info *info,
886 asection *sec,
887 const Elf_Internal_Rela *relocs)
888 {
889 struct elf_s390_link_hash_table *htab;
890 Elf_Internal_Shdr *symtab_hdr;
891 struct elf_link_hash_entry **sym_hashes;
892 const Elf_Internal_Rela *rel;
893 const Elf_Internal_Rela *rel_end;
894 asection *sreloc;
895 bfd_signed_vma *local_got_refcounts;
896 int tls_type, old_tls_type;
897 Elf_Internal_Sym *isym;
898
899 if (bfd_link_relocatable (info))
900 return true;
901
902 BFD_ASSERT (is_s390_elf (abfd));
903
904 htab = elf_s390_hash_table (info);
905 symtab_hdr = &elf_symtab_hdr (abfd);
906 sym_hashes = elf_sym_hashes (abfd);
907 local_got_refcounts = elf_local_got_refcounts (abfd);
908
909 sreloc = NULL;
910
911 rel_end = relocs + sec->reloc_count;
912 for (rel = relocs; rel < rel_end; rel++)
913 {
914 unsigned int r_type;
915 unsigned int r_symndx;
916 struct elf_link_hash_entry *h;
917
918 r_symndx = ELF32_R_SYM (rel->r_info);
919
920 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
921 {
922 /* xgettext:c-format */
923 _bfd_error_handler (_("%pB: bad symbol index: %d"),
924 abfd, r_symndx);
925 return false;
926 }
927
928 if (r_symndx < symtab_hdr->sh_info)
929 {
930 /* A local symbol. */
931 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
932 abfd, r_symndx);
933 if (isym == NULL)
934 return false;
935
936 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
937 {
938 struct plt_entry *plt;
939
940 if (htab->elf.dynobj == NULL)
941 htab->elf.dynobj = abfd;
942
943 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
944 return false;
945
946 if (local_got_refcounts == NULL)
947 {
948 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
949 return false;
950 local_got_refcounts = elf_local_got_refcounts (abfd);
951 }
952 plt = elf_s390_local_plt (abfd);
953 plt[r_symndx].plt.refcount++;
954 }
955 h = NULL;
956 }
957 else
958 {
959 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
960 while (h->root.type == bfd_link_hash_indirect
961 || h->root.type == bfd_link_hash_warning)
962 h = (struct elf_link_hash_entry *) h->root.u.i.link;
963 }
964
965 /* Create got section and local_got_refcounts array if they
966 are needed. */
967 r_type = elf_s390_tls_transition (info,
968 ELF32_R_TYPE (rel->r_info),
969 h == NULL);
970 switch (r_type)
971 {
972 case R_390_GOT12:
973 case R_390_GOT16:
974 case R_390_GOT20:
975 case R_390_GOT32:
976 case R_390_GOTENT:
977 case R_390_GOTPLT12:
978 case R_390_GOTPLT16:
979 case R_390_GOTPLT20:
980 case R_390_GOTPLT32:
981 case R_390_GOTPLTENT:
982 case R_390_TLS_GD32:
983 case R_390_TLS_GOTIE12:
984 case R_390_TLS_GOTIE20:
985 case R_390_TLS_GOTIE32:
986 case R_390_TLS_IEENT:
987 case R_390_TLS_IE32:
988 case R_390_TLS_LDM32:
989 if (h == NULL
990 && local_got_refcounts == NULL)
991 {
992 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
993 return false;
994 local_got_refcounts = elf_local_got_refcounts (abfd);
995 }
996 /* Fall through. */
997 case R_390_GOTOFF16:
998 case R_390_GOTOFF32:
999 case R_390_GOTPC:
1000 case R_390_GOTPCDBL:
1001 if (htab->elf.sgot == NULL)
1002 {
1003 if (htab->elf.dynobj == NULL)
1004 htab->elf.dynobj = abfd;
1005 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1006 return false;
1007 }
1008 }
1009
1010 if (h != NULL)
1011 {
1012 if (htab->elf.dynobj == NULL)
1013 htab->elf.dynobj = abfd;
1014 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1015 return false;
1016
1017 /* Make sure an IFUNC symbol defined in a non-shared object
1018 always gets a PLT slot. */
1019 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1020 {
1021 /* The symbol is called by the dynamic loader in order
1022 to resolve the relocation. So it is in fact also
1023 referenced. */
1024 h->ref_regular = 1;
1025 h->needs_plt = 1;
1026 }
1027 }
1028 switch (r_type)
1029 {
1030 case R_390_GOTPC:
1031 case R_390_GOTPCDBL:
1032 /* These relocs do not need a GOT slot. They just load the
1033 GOT pointer itself or address something else relative to
1034 the GOT. Since the GOT pointer has been set up above we
1035 are done. */
1036 break;
1037 case R_390_GOTOFF16:
1038 case R_390_GOTOFF32:
1039 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
1040 break;
1041 /* Fall through. */
1042
1043 case R_390_PLT12DBL:
1044 case R_390_PLT16DBL:
1045 case R_390_PLT24DBL:
1046 case R_390_PLT32DBL:
1047 case R_390_PLT32:
1048 case R_390_PLTOFF16:
1049 case R_390_PLTOFF32:
1050 /* This symbol requires a procedure linkage table entry. We
1051 actually build the entry in adjust_dynamic_symbol,
1052 because this might be a case of linking PIC code which is
1053 never referenced by a dynamic object, in which case we
1054 don't need to generate a procedure linkage table entry
1055 after all. */
1056
1057 /* If this is a local symbol, we resolve it directly without
1058 creating a procedure linkage table entry. */
1059 if (h != NULL)
1060 {
1061 h->needs_plt = 1;
1062 h->plt.refcount += 1;
1063 }
1064 break;
1065
1066 case R_390_GOTPLT12:
1067 case R_390_GOTPLT16:
1068 case R_390_GOTPLT20:
1069 case R_390_GOTPLT32:
1070 case R_390_GOTPLTENT:
1071 /* This symbol requires either a procedure linkage table entry
1072 or an entry in the local got. We actually build the entry
1073 in adjust_dynamic_symbol because whether this is really a
1074 global reference can change and with it the fact if we have
1075 to create a plt entry or a local got entry. To be able to
1076 make a once global symbol a local one we have to keep track
1077 of the number of gotplt references that exist for this
1078 symbol. */
1079 if (h != NULL)
1080 {
1081 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1082 h->needs_plt = 1;
1083 h->plt.refcount += 1;
1084 }
1085 else
1086 local_got_refcounts[r_symndx] += 1;
1087 break;
1088
1089 case R_390_TLS_LDM32:
1090 htab->tls_ldm_got.refcount += 1;
1091 break;
1092
1093 case R_390_TLS_IE32:
1094 case R_390_TLS_GOTIE12:
1095 case R_390_TLS_GOTIE20:
1096 case R_390_TLS_GOTIE32:
1097 case R_390_TLS_IEENT:
1098 if (bfd_link_pic (info))
1099 info->flags |= DF_STATIC_TLS;
1100 /* Fall through. */
1101
1102 case R_390_GOT12:
1103 case R_390_GOT16:
1104 case R_390_GOT20:
1105 case R_390_GOT32:
1106 case R_390_GOTENT:
1107 case R_390_TLS_GD32:
1108 /* This symbol requires a global offset table entry. */
1109 switch (r_type)
1110 {
1111 default:
1112 case R_390_GOT12:
1113 case R_390_GOT16:
1114 case R_390_GOT20:
1115 case R_390_GOT32:
1116 case R_390_GOTENT:
1117 tls_type = GOT_NORMAL;
1118 break;
1119 case R_390_TLS_GD32:
1120 tls_type = GOT_TLS_GD;
1121 break;
1122 case R_390_TLS_IE32:
1123 case R_390_TLS_GOTIE32:
1124 tls_type = GOT_TLS_IE;
1125 break;
1126 case R_390_TLS_GOTIE12:
1127 case R_390_TLS_GOTIE20:
1128 case R_390_TLS_IEENT:
1129 tls_type = GOT_TLS_IE_NLT;
1130 break;
1131 }
1132
1133 if (h != NULL)
1134 {
1135 h->got.refcount += 1;
1136 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1137 }
1138 else
1139 {
1140 local_got_refcounts[r_symndx] += 1;
1141 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1142 }
1143 /* If a TLS symbol is accessed using IE at least once,
1144 there is no point to use dynamic model for it. */
1145 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1146 {
1147 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1148 {
1149 _bfd_error_handler
1150 /* xgettext:c-format */
1151 (_("%pB: `%s' accessed both as normal and thread local symbol"),
1152 abfd, h->root.root.string);
1153 return false;
1154 }
1155 if (old_tls_type > tls_type)
1156 tls_type = old_tls_type;
1157 }
1158
1159 if (old_tls_type != tls_type)
1160 {
1161 if (h != NULL)
1162 elf_s390_hash_entry (h)->tls_type = tls_type;
1163 else
1164 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1165 }
1166
1167 if (r_type != R_390_TLS_IE32)
1168 break;
1169 /* Fall through. */
1170
1171 case R_390_TLS_LE32:
1172 /* For static linking and executables this reloc will be
1173 calculated at linktime otherwise a TLS_TPOFF runtime
1174 reloc will be generated. */
1175 if (r_type == R_390_TLS_LE32 && bfd_link_pie (info))
1176 break;
1177
1178 if (!bfd_link_pic (info))
1179 break;
1180 info->flags |= DF_STATIC_TLS;
1181 /* Fall through. */
1182
1183 case R_390_8:
1184 case R_390_16:
1185 case R_390_32:
1186 case R_390_PC16:
1187 case R_390_PC12DBL:
1188 case R_390_PC16DBL:
1189 case R_390_PC24DBL:
1190 case R_390_PC32DBL:
1191 case R_390_PC32:
1192 if (h != NULL && bfd_link_executable (info))
1193 {
1194 /* If this reloc is in a read-only section, we might
1195 need a copy reloc. We can't check reliably at this
1196 stage whether the section is read-only, as input
1197 sections have not yet been mapped to output sections.
1198 Tentatively set the flag for now, and correct in
1199 adjust_dynamic_symbol. */
1200 h->non_got_ref = 1;
1201
1202 if (!bfd_link_pic (info))
1203 {
1204 /* We may need a .plt entry if the function this reloc
1205 refers to is in a shared lib. */
1206 h->plt.refcount += 1;
1207 }
1208 }
1209
1210 /* If we are creating a shared library, and this is a reloc
1211 against a global symbol, or a non PC relative reloc
1212 against a local symbol, then we need to copy the reloc
1213 into the shared library. However, if we are linking with
1214 -Bsymbolic, we do not need to copy a reloc against a
1215 global symbol which is defined in an object we are
1216 including in the link (i.e., DEF_REGULAR is set). At
1217 this point we have not seen all the input files, so it is
1218 possible that DEF_REGULAR is not set now but will be set
1219 later (it is never cleared). In case of a weak definition,
1220 DEF_REGULAR may be cleared later by a strong definition in
1221 a shared library. We account for that possibility below by
1222 storing information in the relocs_copied field of the hash
1223 table entry. A similar situation occurs when creating
1224 shared libraries and symbol visibility changes render the
1225 symbol local.
1226
1227 If on the other hand, we are creating an executable, we
1228 may need to keep relocations for symbols satisfied by a
1229 dynamic library if we manage to avoid copy relocs for the
1230 symbol. */
1231 if ((bfd_link_pic (info)
1232 && (sec->flags & SEC_ALLOC) != 0
1233 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1234 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL
1235 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1236 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL
1237 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1238 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1239 || (h != NULL
1240 && (! SYMBOLIC_BIND (info, h)
1241 || h->root.type == bfd_link_hash_defweak
1242 || !h->def_regular))))
1243 || (ELIMINATE_COPY_RELOCS
1244 && !bfd_link_pic (info)
1245 && (sec->flags & SEC_ALLOC) != 0
1246 && h != NULL
1247 && (h->root.type == bfd_link_hash_defweak
1248 || !h->def_regular)))
1249 {
1250 struct elf_dyn_relocs *p;
1251 struct elf_dyn_relocs **head;
1252
1253 /* We must copy these reloc types into the output file.
1254 Create a reloc section in dynobj and make room for
1255 this reloc. */
1256 if (sreloc == NULL)
1257 {
1258 if (htab->elf.dynobj == NULL)
1259 htab->elf.dynobj = abfd;
1260
1261 sreloc = _bfd_elf_make_dynamic_reloc_section
1262 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ true);
1263
1264 if (sreloc == NULL)
1265 return false;
1266 }
1267
1268 /* If this is a global symbol, we count the number of
1269 relocations we need for this symbol. */
1270 if (h != NULL)
1271 {
1272 head = &h->dyn_relocs;
1273 }
1274 else
1275 {
1276 /* Track dynamic relocs needed for local syms too.
1277 We really need local syms available to do this
1278 easily. Oh well. */
1279 asection *s;
1280 void *vpp;
1281
1282 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1283 abfd, r_symndx);
1284 if (isym == NULL)
1285 return false;
1286
1287 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1288 if (s == NULL)
1289 s = sec;
1290
1291 vpp = &elf_section_data (s)->local_dynrel;
1292 head = (struct elf_dyn_relocs **) vpp;
1293 }
1294
1295 p = *head;
1296 if (p == NULL || p->sec != sec)
1297 {
1298 size_t amt = sizeof *p;
1299
1300 p = ((struct elf_dyn_relocs *)
1301 bfd_alloc (htab->elf.dynobj, amt));
1302 if (p == NULL)
1303 return false;
1304 p->next = *head;
1305 *head = p;
1306 p->sec = sec;
1307 p->count = 0;
1308 p->pc_count = 0;
1309 }
1310
1311 p->count += 1;
1312 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1313 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL
1314 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1315 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL
1316 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1317 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1318 p->pc_count += 1;
1319 }
1320 break;
1321
1322 /* This relocation describes the C++ object vtable hierarchy.
1323 Reconstruct it for later use during GC. */
1324 case R_390_GNU_VTINHERIT:
1325 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1326 return false;
1327 break;
1328
1329 /* This relocation describes which C++ vtable entries are actually
1330 used. Record for later use during GC. */
1331 case R_390_GNU_VTENTRY:
1332 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1333 return false;
1334 break;
1335
1336 default:
1337 break;
1338 }
1339 }
1340
1341 return true;
1342 }
1343
1344 /* Return the section that should be marked against GC for a given
1345 relocation. */
1346
1347 static asection *
elf_s390_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1348 elf_s390_gc_mark_hook (asection *sec,
1349 struct bfd_link_info *info,
1350 Elf_Internal_Rela *rel,
1351 struct elf_link_hash_entry *h,
1352 Elf_Internal_Sym *sym)
1353 {
1354 if (h != NULL)
1355 switch (ELF32_R_TYPE (rel->r_info))
1356 {
1357 case R_390_GNU_VTINHERIT:
1358 case R_390_GNU_VTENTRY:
1359 return NULL;
1360 }
1361 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1362
1363 }
1364
1365 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1366 entry but we found we will not create any. Called when we find we will
1367 not have any PLT for this symbol, by for example
1368 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1369 or elf_s390_late_size_sections if no dynamic sections will be
1370 created (we're only linking static objects). */
1371
1372 static void
elf_s390_adjust_gotplt(struct elf_s390_link_hash_entry * h)1373 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1374 {
1375 if (h->elf.root.type == bfd_link_hash_warning)
1376 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1377
1378 if (h->gotplt_refcount <= 0)
1379 return;
1380
1381 /* We simply add the number of gotplt references to the number
1382 * of got references for this symbol. */
1383 h->elf.got.refcount += h->gotplt_refcount;
1384 h->gotplt_refcount = -1;
1385 }
1386
1387 /* Adjust a symbol defined by a dynamic object and referenced by a
1388 regular object. The current definition is in some section of the
1389 dynamic object, but we're not including those sections. We have to
1390 change the definition to something the rest of the link can
1391 understand. */
1392
1393 static bool
elf_s390_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1394 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1395 struct elf_link_hash_entry *h)
1396 {
1397 struct elf_s390_link_hash_table *htab;
1398 asection *s, *srel;
1399
1400 /* STT_GNU_IFUNC symbol must go through PLT. */
1401 if (s390_is_ifunc_symbol_p (h))
1402 {
1403 /* All local STT_GNU_IFUNC references must be treated as local
1404 calls via local PLT. */
1405 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1406 {
1407 bfd_size_type pc_count = 0, count = 0;
1408 struct elf_dyn_relocs **pp;
1409 struct elf_dyn_relocs *p;
1410
1411 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1412 {
1413 pc_count += p->pc_count;
1414 p->count -= p->pc_count;
1415 p->pc_count = 0;
1416 count += p->count;
1417 if (p->count == 0)
1418 *pp = p->next;
1419 else
1420 pp = &p->next;
1421 }
1422
1423 if (pc_count || count)
1424 {
1425 h->needs_plt = 1;
1426 h->non_got_ref = 1;
1427 if (h->plt.refcount <= 0)
1428 h->plt.refcount = 1;
1429 else
1430 h->plt.refcount += 1;
1431 }
1432 }
1433
1434 if (h->plt.refcount <= 0)
1435 {
1436 h->plt.offset = (bfd_vma) -1;
1437 h->needs_plt = 0;
1438 }
1439 return true;
1440 }
1441
1442 /* If this is a function, put it in the procedure linkage table. We
1443 will fill in the contents of the procedure linkage table later
1444 (although we could actually do it here). */
1445 if (h->type == STT_FUNC
1446 || h->needs_plt)
1447 {
1448 if (h->plt.refcount <= 0
1449 || SYMBOL_CALLS_LOCAL (info, h)
1450 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1451 {
1452 /* This case can occur if we saw a PLT32 reloc in an input
1453 file, but the symbol was never referred to by a dynamic
1454 object, or if all references were garbage collected. In
1455 such a case, we don't actually need to build a procedure
1456 linkage table, and we can just do a PC32 reloc instead. */
1457 h->plt.offset = (bfd_vma) -1;
1458 h->needs_plt = 0;
1459 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1460 }
1461
1462 return true;
1463 }
1464 else
1465 /* It's possible that we incorrectly decided a .plt reloc was
1466 needed for an R_390_PC32 reloc to a non-function sym in
1467 check_relocs. We can't decide accurately between function and
1468 non-function syms in check-relocs; Objects loaded later in
1469 the link may change h->type. So fix it now. */
1470 h->plt.offset = (bfd_vma) -1;
1471
1472 /* If this is a weak symbol, and there is a real definition, the
1473 processor independent code will have arranged for us to see the
1474 real definition first, and we can just use the same value. */
1475 if (h->is_weakalias)
1476 {
1477 struct elf_link_hash_entry *def = weakdef (h);
1478 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1479 h->root.u.def.section = def->root.u.def.section;
1480 h->root.u.def.value = def->root.u.def.value;
1481 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1482 h->non_got_ref = def->non_got_ref;
1483 return true;
1484 }
1485
1486 /* This is a reference to a symbol defined by a dynamic object which
1487 is not a function. */
1488
1489 /* If we are creating a shared library, we must presume that the
1490 only references to the symbol are via the global offset table.
1491 For such cases we need not do anything here; the relocations will
1492 be handled correctly by relocate_section. */
1493 if (bfd_link_pic (info))
1494 return true;
1495
1496 /* If there are no references to this symbol that do not use the
1497 GOT, we don't need to generate a copy reloc. */
1498 if (!h->non_got_ref)
1499 return true;
1500
1501 /* If -z nocopyreloc was given, we won't generate them either. */
1502 if (info->nocopyreloc)
1503 {
1504 h->non_got_ref = 0;
1505 return true;
1506 }
1507
1508 /* If we don't find any dynamic relocs in read-only sections, then
1509 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1510 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h))
1511 {
1512 h->non_got_ref = 0;
1513 return true;
1514 }
1515
1516 /* We must allocate the symbol in our .dynbss section, which will
1517 become part of the .bss section of the executable. There will be
1518 an entry for this symbol in the .dynsym section. The dynamic
1519 object will contain position independent code, so all references
1520 from the dynamic object to this symbol will go through the global
1521 offset table. The dynamic linker will use the .dynsym entry to
1522 determine the address it must put in the global offset table, so
1523 both the dynamic object and the regular object will refer to the
1524 same memory location for the variable. */
1525
1526 htab = elf_s390_hash_table (info);
1527
1528 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1529 copy the initial value out of the dynamic object and into the
1530 runtime process image. */
1531 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1532 {
1533 s = htab->elf.sdynrelro;
1534 srel = htab->elf.sreldynrelro;
1535 }
1536 else
1537 {
1538 s = htab->elf.sdynbss;
1539 srel = htab->elf.srelbss;
1540 }
1541 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1542 {
1543 srel->size += sizeof (Elf32_External_Rela);
1544 h->needs_copy = 1;
1545 }
1546
1547 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1548 }
1549
1550 /* Allocate space in .plt, .got and associated reloc sections for
1551 dynamic relocs. */
1552
1553 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1554 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1555 {
1556 struct bfd_link_info *info;
1557 struct elf_s390_link_hash_table *htab;
1558 struct elf_dyn_relocs *p;
1559
1560 if (h->root.type == bfd_link_hash_indirect)
1561 return true;
1562
1563 info = (struct bfd_link_info *) inf;
1564 htab = elf_s390_hash_table (info);
1565
1566 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1567 here if it is defined and referenced in a non-shared object. */
1568 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1569 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1570 else if (htab->elf.dynamic_sections_created
1571 && h->plt.refcount > 0)
1572 {
1573 /* Make sure this symbol is output as a dynamic symbol.
1574 Undefined weak syms won't yet be marked as dynamic. */
1575 if (h->dynindx == -1
1576 && !h->forced_local)
1577 {
1578 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1579 return false;
1580 }
1581
1582 if (bfd_link_pic (info)
1583 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1584 {
1585 asection *s = htab->elf.splt;
1586
1587 /* If this is the first .plt entry, make room for the special
1588 first entry. */
1589 if (s->size == 0)
1590 s->size += PLT_FIRST_ENTRY_SIZE;
1591
1592 h->plt.offset = s->size;
1593
1594 /* If this symbol is not defined in a regular file, and we are
1595 not generating a shared library, then set the symbol to this
1596 location in the .plt. This is required to make function
1597 pointers compare as equal between the normal executable and
1598 the shared library. */
1599 if (! bfd_link_pic (info)
1600 && !h->def_regular)
1601 {
1602 h->root.u.def.section = s;
1603 h->root.u.def.value = h->plt.offset;
1604 }
1605
1606 /* Make room for this entry. */
1607 s->size += PLT_ENTRY_SIZE;
1608
1609 /* We also need to make an entry in the .got.plt section, which
1610 will be placed in the .got section by the linker script. */
1611 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1612
1613 /* We also need to make an entry in the .rela.plt section. */
1614 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1615 }
1616 else
1617 {
1618 h->plt.offset = (bfd_vma) -1;
1619 h->needs_plt = 0;
1620 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1621 }
1622 }
1623 else
1624 {
1625 h->plt.offset = (bfd_vma) -1;
1626 h->needs_plt = 0;
1627 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1628 }
1629
1630 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1631 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1632 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1633 we can save the dynamic TLS relocation. */
1634 if (h->got.refcount > 0
1635 && !bfd_link_pic (info)
1636 && h->dynindx == -1
1637 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1638 {
1639 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1640 /* For the GOTIE access without a literal pool entry the offset has
1641 to be stored somewhere. The immediate value in the instruction
1642 is not bit enough so the value is stored in the got. */
1643 {
1644 h->got.offset = htab->elf.sgot->size;
1645 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1646 }
1647 else
1648 h->got.offset = (bfd_vma) -1;
1649 }
1650 else if (h->got.refcount > 0)
1651 {
1652 asection *s;
1653 bool dyn;
1654 int tls_type = elf_s390_hash_entry(h)->tls_type;
1655
1656 /* Make sure this symbol is output as a dynamic symbol.
1657 Undefined weak syms won't yet be marked as dynamic. */
1658 if (h->dynindx == -1
1659 && !h->forced_local)
1660 {
1661 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1662 return false;
1663 }
1664
1665 s = htab->elf.sgot;
1666 h->got.offset = s->size;
1667 s->size += GOT_ENTRY_SIZE;
1668 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1669 if (tls_type == GOT_TLS_GD)
1670 s->size += GOT_ENTRY_SIZE;
1671 dyn = htab->elf.dynamic_sections_created;
1672 /* R_390_TLS_IE32 needs one dynamic relocation,
1673 R_390_TLS_GD32 needs one if local symbol and two if global. */
1674 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1675 || tls_type >= GOT_TLS_IE)
1676 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1677 else if (tls_type == GOT_TLS_GD)
1678 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1679 else if (!UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)
1680 && (bfd_link_pic (info)
1681 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1682 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1683 }
1684 else
1685 h->got.offset = (bfd_vma) -1;
1686
1687 if (h->dyn_relocs == NULL)
1688 return true;
1689
1690 /* In the shared -Bsymbolic case, discard space allocated for
1691 dynamic pc-relative relocs against symbols which turn out to be
1692 defined in regular objects. For the normal shared case, discard
1693 space for pc-relative relocs that have become local due to symbol
1694 visibility changes. */
1695
1696 if (bfd_link_pic (info))
1697 {
1698 if (SYMBOL_CALLS_LOCAL (info, h))
1699 {
1700 struct elf_dyn_relocs **pp;
1701
1702 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1703 {
1704 p->count -= p->pc_count;
1705 p->pc_count = 0;
1706 if (p->count == 0)
1707 *pp = p->next;
1708 else
1709 pp = &p->next;
1710 }
1711 }
1712
1713 /* Also discard relocs on undefined weak syms with non-default
1714 visibility. */
1715 if (h->dyn_relocs != NULL
1716 && h->root.type == bfd_link_hash_undefweak)
1717 {
1718 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1719 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1720 h->dyn_relocs = NULL;
1721
1722 /* Make sure undefined weak symbols are output as a dynamic
1723 symbol in PIEs. */
1724 else if (h->dynindx == -1
1725 && !h->forced_local)
1726 {
1727 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1728 return false;
1729 }
1730 }
1731 }
1732 else if (ELIMINATE_COPY_RELOCS)
1733 {
1734 /* For the non-shared case, discard space for relocs against
1735 symbols which turn out to need copy relocs or are not
1736 dynamic. */
1737
1738 if (!h->non_got_ref
1739 && ((h->def_dynamic
1740 && !h->def_regular)
1741 || (htab->elf.dynamic_sections_created
1742 && (h->root.type == bfd_link_hash_undefweak
1743 || h->root.type == bfd_link_hash_undefined))))
1744 {
1745 /* Make sure this symbol is output as a dynamic symbol.
1746 Undefined weak syms won't yet be marked as dynamic. */
1747 if (h->dynindx == -1
1748 && !h->forced_local)
1749 {
1750 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1751 return false;
1752 }
1753
1754 /* If that succeeded, we know we'll be keeping all the
1755 relocs. */
1756 if (h->dynindx != -1)
1757 goto keep;
1758 }
1759
1760 h->dyn_relocs = NULL;
1761
1762 keep: ;
1763 }
1764
1765 /* Finally, allocate space. */
1766 for (p = h->dyn_relocs; p != NULL; p = p->next)
1767 {
1768 asection *sreloc = elf_section_data (p->sec)->sreloc;
1769
1770 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1771 }
1772
1773 return true;
1774 }
1775
1776 /* Set the sizes of the dynamic sections. */
1777
1778 static bool
elf_s390_late_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)1779 elf_s390_late_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1780 struct bfd_link_info *info)
1781 {
1782 struct elf_s390_link_hash_table *htab;
1783 bfd *dynobj;
1784 asection *s;
1785 bool relocs;
1786 bfd *ibfd;
1787
1788 htab = elf_s390_hash_table (info);
1789 dynobj = htab->elf.dynobj;
1790 if (dynobj == NULL)
1791 return true;
1792
1793 if (htab->elf.dynamic_sections_created)
1794 {
1795 /* Set the contents of the .interp section to the interpreter. */
1796 if (bfd_link_executable (info) && !info->nointerp)
1797 {
1798 s = bfd_get_linker_section (dynobj, ".interp");
1799 if (s == NULL)
1800 abort ();
1801 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1802 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1803 }
1804 }
1805
1806 /* Set up .got offsets for local syms, and space for local dynamic
1807 relocs. */
1808 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1809 {
1810 bfd_signed_vma *local_got;
1811 bfd_signed_vma *end_local_got;
1812 char *local_tls_type;
1813 bfd_size_type locsymcount;
1814 Elf_Internal_Shdr *symtab_hdr;
1815 asection *srela;
1816 struct plt_entry *local_plt;
1817 unsigned int i;
1818
1819 if (! is_s390_elf (ibfd))
1820 continue;
1821
1822 for (s = ibfd->sections; s != NULL; s = s->next)
1823 {
1824 struct elf_dyn_relocs *p;
1825
1826 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1827 {
1828 if (!bfd_is_abs_section (p->sec)
1829 && bfd_is_abs_section (p->sec->output_section))
1830 {
1831 /* Input section has been discarded, either because
1832 it is a copy of a linkonce section or due to
1833 linker script /DISCARD/, so we'll be discarding
1834 the relocs too. */
1835 }
1836 else if (p->count != 0)
1837 {
1838 srela = elf_section_data (p->sec)->sreloc;
1839 srela->size += p->count * sizeof (Elf32_External_Rela);
1840 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1841 info->flags |= DF_TEXTREL;
1842 }
1843 }
1844 }
1845
1846 local_got = elf_local_got_refcounts (ibfd);
1847 if (!local_got)
1848 continue;
1849
1850 symtab_hdr = &elf_symtab_hdr (ibfd);
1851 locsymcount = symtab_hdr->sh_info;
1852 end_local_got = local_got + locsymcount;
1853 local_tls_type = elf_s390_local_got_tls_type (ibfd);
1854 s = htab->elf.sgot;
1855 srela = htab->elf.srelgot;
1856 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1857 {
1858 if (*local_got > 0)
1859 {
1860 *local_got = s->size;
1861 s->size += GOT_ENTRY_SIZE;
1862 if (*local_tls_type == GOT_TLS_GD)
1863 s->size += GOT_ENTRY_SIZE;
1864 if (bfd_link_pic (info))
1865 srela->size += sizeof (Elf32_External_Rela);
1866 }
1867 else
1868 *local_got = (bfd_vma) -1;
1869 }
1870 local_plt = elf_s390_local_plt (ibfd);
1871 for (i = 0; i < symtab_hdr->sh_info; i++)
1872 {
1873 if (local_plt[i].plt.refcount > 0)
1874 {
1875 local_plt[i].plt.offset = htab->elf.iplt->size;
1876 htab->elf.iplt->size += PLT_ENTRY_SIZE;
1877 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
1878 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
1879 }
1880 else
1881 local_plt[i].plt.offset = (bfd_vma) -1;
1882 }
1883 }
1884
1885 if (htab->tls_ldm_got.refcount > 0)
1886 {
1887 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
1888 relocs. */
1889 htab->tls_ldm_got.offset = htab->elf.sgot->size;
1890 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
1891 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1892 }
1893 else
1894 htab->tls_ldm_got.offset = -1;
1895
1896 /* Allocate global sym .plt and .got entries, and space for global
1897 sym dynamic relocs. */
1898 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
1899
1900 /* We now have determined the sizes of the various dynamic sections.
1901 Allocate memory for them. */
1902 relocs = false;
1903 for (s = dynobj->sections; s != NULL; s = s->next)
1904 {
1905 if ((s->flags & SEC_LINKER_CREATED) == 0)
1906 continue;
1907
1908 if (s == htab->elf.splt
1909 || s == htab->elf.sgot
1910 || s == htab->elf.sgotplt
1911 || s == htab->elf.sdynbss
1912 || s == htab->elf.sdynrelro
1913 || s == htab->elf.iplt
1914 || s == htab->elf.igotplt
1915 || s == htab->irelifunc)
1916 {
1917 /* Strip this section if we don't need it; see the
1918 comment below. */
1919 }
1920 else if (startswith (bfd_section_name (s), ".rela"))
1921 {
1922 if (s->size != 0)
1923 relocs = true;
1924
1925 /* We use the reloc_count field as a counter if we need
1926 to copy relocs into the output file. */
1927 s->reloc_count = 0;
1928 }
1929 else
1930 {
1931 /* It's not one of our sections, so don't allocate space. */
1932 continue;
1933 }
1934
1935 if (s->size == 0)
1936 {
1937 /* If we don't need this section, strip it from the
1938 output file. This is to handle .rela.bss and
1939 .rela.plt. We must create it in
1940 create_dynamic_sections, because it must be created
1941 before the linker maps input sections to output
1942 sections. The linker does that before
1943 adjust_dynamic_symbol is called, and it is that
1944 function which decides whether anything needs to go
1945 into these sections. */
1946
1947 s->flags |= SEC_EXCLUDE;
1948 continue;
1949 }
1950
1951 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1952 continue;
1953
1954 /* Allocate memory for the section contents. We use bfd_zalloc
1955 here in case unused entries are not reclaimed before the
1956 section's contents are written out. This should not happen,
1957 but this way if it does, we get a R_390_NONE reloc instead
1958 of garbage. */
1959 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1960 if (s->contents == NULL)
1961 return false;
1962 }
1963
1964 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1965 }
1966
1967 /* Return the base VMA address which should be subtracted from real addresses
1968 when resolving @dtpoff relocation.
1969 This is PT_TLS segment p_vaddr. */
1970
1971 static bfd_vma
dtpoff_base(struct bfd_link_info * info)1972 dtpoff_base (struct bfd_link_info *info)
1973 {
1974 /* If tls_sec is NULL, we should have signalled an error already. */
1975 if (elf_hash_table (info)->tls_sec == NULL)
1976 return 0;
1977 return elf_hash_table (info)->tls_sec->vma;
1978 }
1979
1980 /* Return the relocation value for @tpoff relocation
1981 if STT_TLS virtual address is ADDRESS. */
1982
1983 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)1984 tpoff (struct bfd_link_info *info, bfd_vma address)
1985 {
1986 struct elf_link_hash_table *htab = elf_hash_table (info);
1987
1988 /* If tls_sec is NULL, we should have signalled an error already. */
1989 if (htab->tls_sec == NULL)
1990 return 0;
1991 return htab->tls_size + htab->tls_sec->vma - address;
1992 }
1993
1994 /* Complain if TLS instruction relocation is against an invalid
1995 instruction. */
1996
1997 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)1998 invalid_tls_insn (bfd *input_bfd,
1999 asection *input_section,
2000 Elf_Internal_Rela *rel)
2001 {
2002 reloc_howto_type *howto;
2003
2004 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2005 _bfd_error_handler
2006 /* xgettext:c-format */
2007 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
2008 input_bfd,
2009 input_section,
2010 (uint64_t) rel->r_offset,
2011 howto->name);
2012 bfd_set_error (bfd_error_bad_value);
2013 }
2014
2015 /* Relocate a 390 ELF section. */
2016
2017 static int
elf_s390_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)2018 elf_s390_relocate_section (bfd *output_bfd,
2019 struct bfd_link_info *info,
2020 bfd *input_bfd,
2021 asection *input_section,
2022 bfd_byte *contents,
2023 Elf_Internal_Rela *relocs,
2024 Elf_Internal_Sym *local_syms,
2025 asection **local_sections)
2026 {
2027 struct elf_s390_link_hash_table *htab;
2028 Elf_Internal_Shdr *symtab_hdr;
2029 struct elf_link_hash_entry **sym_hashes;
2030 bfd_vma *local_got_offsets;
2031 Elf_Internal_Rela *rel;
2032 Elf_Internal_Rela *relend;
2033
2034 if (!is_s390_elf (input_bfd))
2035 {
2036 bfd_set_error (bfd_error_wrong_format);
2037 return false;
2038 }
2039
2040 htab = elf_s390_hash_table (info);
2041 symtab_hdr = &elf_symtab_hdr (input_bfd);
2042 sym_hashes = elf_sym_hashes (input_bfd);
2043 local_got_offsets = elf_local_got_offsets (input_bfd);
2044
2045 rel = relocs;
2046 relend = relocs + input_section->reloc_count;
2047 for (; rel < relend; rel++)
2048 {
2049 unsigned int r_type;
2050 reloc_howto_type *howto;
2051 unsigned long r_symndx;
2052 struct elf_link_hash_entry *h;
2053 Elf_Internal_Sym *sym;
2054 asection *sec;
2055 bfd_vma off;
2056 bfd_vma relocation;
2057 bool unresolved_reloc;
2058 bfd_reloc_status_type r;
2059 int tls_type;
2060 asection *base_got = htab->elf.sgot;
2061 bool resolved_to_zero;
2062
2063 r_type = ELF32_R_TYPE (rel->r_info);
2064 if (r_type == (int) R_390_GNU_VTINHERIT
2065 || r_type == (int) R_390_GNU_VTENTRY)
2066 continue;
2067 if (r_type >= (int) R_390_max)
2068 {
2069 bfd_set_error (bfd_error_bad_value);
2070 return false;
2071 }
2072
2073 howto = elf_howto_table + r_type;
2074 r_symndx = ELF32_R_SYM (rel->r_info);
2075
2076 h = NULL;
2077 sym = NULL;
2078 sec = NULL;
2079 unresolved_reloc = false;
2080 if (r_symndx < symtab_hdr->sh_info)
2081 {
2082 sym = local_syms + r_symndx;
2083 sec = local_sections[r_symndx];
2084 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2085 {
2086 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2087 if (local_plt == NULL)
2088 return false;
2089
2090 /* Address of the PLT slot. */
2091 relocation = (htab->elf.iplt->output_section->vma
2092 + htab->elf.iplt->output_offset
2093 + local_plt[r_symndx].plt.offset);
2094
2095 switch (r_type)
2096 {
2097 case R_390_PLTOFF16:
2098 case R_390_PLTOFF32:
2099 relocation -= htab->elf.sgot->output_section->vma;
2100 break;
2101 case R_390_GOTPLT12:
2102 case R_390_GOTPLT16:
2103 case R_390_GOTPLT20:
2104 case R_390_GOTPLT32:
2105 case R_390_GOTPLTENT:
2106 case R_390_GOT12:
2107 case R_390_GOT16:
2108 case R_390_GOT20:
2109 case R_390_GOT32:
2110 case R_390_GOTENT:
2111 {
2112 /* Write the PLT slot address into the GOT slot. */
2113 bfd_put_32 (output_bfd, relocation,
2114 htab->elf.sgot->contents +
2115 local_got_offsets[r_symndx]);
2116 relocation = (local_got_offsets[r_symndx] +
2117 htab->elf.sgot->output_offset);
2118
2119 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2120 relocation += htab->elf.sgot->output_section->vma;
2121 break;
2122 }
2123 default:
2124 break;
2125 }
2126 /* The output section is needed later in
2127 finish_dynamic_section when creating the dynamic
2128 relocation. */
2129 local_plt[r_symndx].sec = sec;
2130 goto do_relocation;
2131 }
2132 else
2133 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2134 }
2135 else
2136 {
2137 bool warned ATTRIBUTE_UNUSED;
2138 bool ignored ATTRIBUTE_UNUSED;
2139
2140 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2141 r_symndx, symtab_hdr, sym_hashes,
2142 h, sec, relocation,
2143 unresolved_reloc, warned, ignored);
2144 }
2145
2146 if (sec != NULL && discarded_section (sec))
2147 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2148 rel, 1, relend, howto, 0, contents);
2149
2150 if (bfd_link_relocatable (info))
2151 continue;
2152
2153 resolved_to_zero = (h != NULL
2154 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
2155
2156 switch (r_type)
2157 {
2158 case R_390_GOTPLT12:
2159 case R_390_GOTPLT16:
2160 case R_390_GOTPLT20:
2161 case R_390_GOTPLT32:
2162 case R_390_GOTPLTENT:
2163 /* There are three cases for a GOTPLT relocation. 1) The
2164 relocation is against the jump slot entry of a plt that
2165 will get emitted to the output file. 2) The relocation
2166 is against the jump slot of a plt entry that has been
2167 removed. elf_s390_adjust_gotplt has created a GOT entry
2168 as replacement. 3) The relocation is against a local symbol.
2169 Cases 2) and 3) are the same as the GOT relocation code
2170 so we just have to test for case 1 and fall through for
2171 the other two. */
2172 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2173 {
2174 bfd_vma plt_index;
2175
2176 if (s390_is_ifunc_symbol_p (h))
2177 {
2178 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2179 relocation = (plt_index * GOT_ENTRY_SIZE +
2180 htab->elf.igotplt->output_offset);
2181 if (r_type == R_390_GOTPLTENT)
2182 relocation += htab->elf.igotplt->output_section->vma;
2183 }
2184 else
2185 {
2186 /* Calc. index no.
2187 Current offset - size first entry / entry size. */
2188 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2189 PLT_ENTRY_SIZE;
2190
2191 /* Offset in GOT is PLT index plus GOT headers(3)
2192 times 4, addr & GOT addr. */
2193 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2194 if (r_type == R_390_GOTPLTENT)
2195 relocation += htab->elf.sgot->output_section->vma;
2196 }
2197 unresolved_reloc = false;
2198
2199 }
2200 /* Fall through. */
2201
2202 case R_390_GOT12:
2203 case R_390_GOT16:
2204 case R_390_GOT20:
2205 case R_390_GOT32:
2206 case R_390_GOTENT:
2207 /* Relocation is to the entry for this symbol in the global
2208 offset table. */
2209 if (base_got == NULL)
2210 abort ();
2211
2212 if (h != NULL)
2213 {
2214 bool dyn;
2215
2216 off = h->got.offset;
2217 dyn = htab->elf.dynamic_sections_created;
2218
2219 if (s390_is_ifunc_symbol_p (h))
2220 {
2221 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2222 if (off == (bfd_vma)-1)
2223 {
2224 /* No explicit GOT usage so redirect to the
2225 got.iplt slot. */
2226 base_got = htab->elf.igotplt;
2227 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2228 }
2229 else
2230 {
2231 /* Explicit GOT slots must contain the address
2232 of the PLT slot. This will be handled in
2233 finish_dynamic_symbol. */
2234 }
2235 }
2236 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2237 bfd_link_pic (info),
2238 h)
2239 || (bfd_link_pic (info)
2240 && SYMBOL_REFERENCES_LOCAL (info, h))
2241 || resolved_to_zero)
2242 {
2243 /* This is actually a static link, or it is a
2244 -Bsymbolic link and the symbol is defined
2245 locally, or the symbol was forced to be local
2246 because of a version file. We must initialize
2247 this entry in the global offset table. Since the
2248 offset must always be a multiple of 2, we use the
2249 least significant bit to record whether we have
2250 initialized it already.
2251
2252 When doing a dynamic link, we create a .rel.got
2253 relocation entry to initialize the value. This
2254 is done in the finish_dynamic_symbol routine. */
2255 if ((off & 1) != 0)
2256 off &= ~1;
2257 else
2258 {
2259 bfd_put_32 (output_bfd, relocation,
2260 base_got->contents + off);
2261 h->got.offset |= 1;
2262 }
2263
2264 if ((h->def_regular
2265 && bfd_link_pic (info)
2266 && SYMBOL_REFERENCES_LOCAL (info, h))
2267 /* lrl rx,sym@GOTENT -> larl rx, sym */
2268 && ((r_type == R_390_GOTENT
2269 && (bfd_get_16 (input_bfd,
2270 contents + rel->r_offset - 2)
2271 & 0xff0f) == 0xc40d)
2272 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2273 || (r_type == R_390_GOT20
2274 && (bfd_get_32 (input_bfd,
2275 contents + rel->r_offset - 2)
2276 & 0xff00f000) == 0xe300c000
2277 && bfd_get_8 (input_bfd,
2278 contents + rel->r_offset + 3) == 0x58)))
2279 {
2280 unsigned short new_insn =
2281 (0xc000 | (bfd_get_8 (input_bfd,
2282 contents + rel->r_offset - 1) & 0xf0));
2283 bfd_put_16 (output_bfd, new_insn,
2284 contents + rel->r_offset - 2);
2285 r_type = R_390_PC32DBL;
2286 rel->r_addend = 2;
2287 howto = elf_howto_table + r_type;
2288 relocation = h->root.u.def.value
2289 + h->root.u.def.section->output_section->vma
2290 + h->root.u.def.section->output_offset;
2291 goto do_relocation;
2292 }
2293 }
2294 else
2295 unresolved_reloc = false;
2296 }
2297 else
2298 {
2299 if (local_got_offsets == NULL)
2300 abort ();
2301
2302 off = local_got_offsets[r_symndx];
2303
2304 /* The offset must always be a multiple of 4. We use
2305 the least significant bit to record whether we have
2306 already generated the necessary reloc. */
2307 if ((off & 1) != 0)
2308 off &= ~1;
2309 else
2310 {
2311 bfd_put_32 (output_bfd, relocation,
2312 htab->elf.sgot->contents + off);
2313
2314 if (bfd_link_pic (info))
2315 {
2316 asection *srelgot;
2317 Elf_Internal_Rela outrel;
2318 bfd_byte *loc;
2319
2320 srelgot = htab->elf.srelgot;
2321 if (srelgot == NULL)
2322 abort ();
2323
2324 outrel.r_offset = (htab->elf.sgot->output_section->vma
2325 + htab->elf.sgot->output_offset
2326 + off);
2327 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2328 outrel.r_addend = relocation;
2329 loc = srelgot->contents;
2330 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2331 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2332 }
2333
2334 local_got_offsets[r_symndx] |= 1;
2335 }
2336 }
2337
2338 if (off >= (bfd_vma) -2)
2339 abort ();
2340
2341 relocation = base_got->output_offset + off;
2342
2343 /* For @GOTENT the relocation is against the offset between
2344 the instruction and the symbols entry in the GOT and not
2345 between the start of the GOT and the symbols entry. We
2346 add the vma of the GOT to get the correct value. */
2347 if ( r_type == R_390_GOTENT
2348 || r_type == R_390_GOTPLTENT)
2349 relocation += base_got->output_section->vma;
2350
2351 break;
2352
2353 case R_390_GOTOFF16:
2354 case R_390_GOTOFF32:
2355 /* Relocation is relative to the start of the global offset
2356 table. */
2357
2358 if (h != NULL
2359 && s390_is_ifunc_symbol_p (h)
2360 && h->def_regular
2361 && !bfd_link_executable (info))
2362 {
2363 relocation = (htab->elf.iplt->output_section->vma
2364 + htab->elf.iplt->output_offset
2365 + h->plt.offset
2366 - htab->elf.sgot->output_section->vma);
2367 goto do_relocation;
2368 }
2369
2370 /* Note that sgot->output_offset is not involved in this
2371 calculation. We always want the start of .got. If we
2372 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2373 permitted by the ABI, we might have to change this
2374 calculation. */
2375 relocation -= htab->elf.sgot->output_section->vma;
2376 break;
2377
2378 case R_390_GOTPC:
2379 case R_390_GOTPCDBL:
2380 /* Use global offset table as symbol value. */
2381 relocation = htab->elf.sgot->output_section->vma;
2382 unresolved_reloc = false;
2383 break;
2384
2385 case R_390_PLT12DBL:
2386 case R_390_PLT16DBL:
2387 case R_390_PLT24DBL:
2388 case R_390_PLT32DBL:
2389 case R_390_PLT32:
2390 /* Relocation is to the entry for this symbol in the
2391 procedure linkage table. */
2392
2393 /* Resolve a PLT32 reloc against a local symbol directly,
2394 without using the procedure linkage table. */
2395 if (h == NULL)
2396 break;
2397
2398 if (h->plt.offset == (bfd_vma) -1
2399 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2400 {
2401 /* We didn't make a PLT entry for this symbol. This
2402 happens when statically linking PIC code, or when
2403 using -Bsymbolic. */
2404 break;
2405 }
2406
2407 if (s390_is_ifunc_symbol_p (h))
2408 relocation = (htab->elf.iplt->output_section->vma
2409 + htab->elf.iplt->output_offset
2410 + h->plt.offset);
2411 else
2412 relocation = (htab->elf.splt->output_section->vma
2413 + htab->elf.splt->output_offset
2414 + h->plt.offset);
2415 unresolved_reloc = false;
2416 break;
2417
2418 case R_390_PLTOFF16:
2419 case R_390_PLTOFF32:
2420 /* Relocation is to the entry for this symbol in the
2421 procedure linkage table relative to the start of the GOT. */
2422
2423 /* For local symbols or if we didn't make a PLT entry for
2424 this symbol resolve the symbol directly. */
2425 if (h == NULL
2426 || h->plt.offset == (bfd_vma) -1
2427 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2428 {
2429 relocation -= htab->elf.sgot->output_section->vma;
2430 break;
2431 }
2432
2433 if (s390_is_ifunc_symbol_p (h))
2434 relocation = (htab->elf.iplt->output_section->vma
2435 + htab->elf.iplt->output_offset
2436 + h->plt.offset
2437 - htab->elf.sgot->output_section->vma);
2438 else
2439 relocation = (htab->elf.splt->output_section->vma
2440 + htab->elf.splt->output_offset
2441 + h->plt.offset
2442 - htab->elf.sgot->output_section->vma);
2443 unresolved_reloc = false;
2444 break;
2445
2446 case R_390_PC16:
2447 case R_390_PC12DBL:
2448 case R_390_PC16DBL:
2449 case R_390_PC24DBL:
2450 case R_390_PC32DBL:
2451 case R_390_PC32:
2452 if (h != NULL
2453 && s390_is_ifunc_symbol_p (h)
2454 && h->def_regular
2455 && !bfd_link_executable (info))
2456 {
2457 /* This will not work our if the function does not
2458 happen to set up the GOT pointer for some other
2459 reason. 31 bit PLT entries require r12 to hold the
2460 GOT pointer.
2461 FIXME: Implement an errorcheck.
2462 NOTE: It will work when brasl is not available
2463 (e.g. with -m31 -march=g5) since a local function
2464 call then does use GOTOFF which implies r12 being set
2465 up. */
2466 relocation = (htab->elf.iplt->output_section->vma
2467 + htab->elf.iplt->output_offset
2468 + h ->plt.offset);
2469 goto do_relocation;
2470 }
2471 /* Fall through. */
2472
2473 case R_390_8:
2474 case R_390_16:
2475 case R_390_32:
2476 if ((input_section->flags & SEC_ALLOC) == 0)
2477 break;
2478
2479 if (h != NULL
2480 && s390_is_ifunc_symbol_p (h)
2481 && h->def_regular)
2482 {
2483 if (!bfd_link_pic (info))
2484 {
2485 /* For a non-shared object STT_GNU_IFUNC symbol must
2486 go through PLT. */
2487 relocation = (htab->elf.iplt->output_section->vma
2488 + htab->elf.iplt->output_offset
2489 + h ->plt.offset);
2490 goto do_relocation;
2491 }
2492 else
2493 {
2494 /* For shared objects a runtime relocation is needed. */
2495
2496 Elf_Internal_Rela outrel;
2497 asection *sreloc;
2498
2499 /* Need a dynamic relocation to get the real function
2500 address. */
2501 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2502 info,
2503 input_section,
2504 rel->r_offset);
2505 if (outrel.r_offset == (bfd_vma) -1
2506 || outrel.r_offset == (bfd_vma) -2)
2507 abort ();
2508
2509 outrel.r_offset += (input_section->output_section->vma
2510 + input_section->output_offset);
2511
2512 if (h->dynindx == -1
2513 || h->forced_local
2514 || bfd_link_executable (info))
2515 {
2516 /* This symbol is resolved locally. */
2517 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2518 outrel.r_addend = (h->root.u.def.value
2519 + h->root.u.def.section->output_section->vma
2520 + h->root.u.def.section->output_offset);
2521 }
2522 else
2523 {
2524 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2525 outrel.r_addend = 0;
2526 }
2527
2528 sreloc = htab->elf.irelifunc;
2529 elf_append_rela (output_bfd, sreloc, &outrel);
2530
2531 /* If this reloc is against an external symbol, we
2532 do not want to fiddle with the addend. Otherwise,
2533 we need to include the symbol value so that it
2534 becomes an addend for the dynamic reloc. For an
2535 internal symbol, we have updated addend. */
2536 continue;
2537 }
2538 }
2539
2540 if ((bfd_link_pic (info)
2541 && (h == NULL
2542 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2543 && !resolved_to_zero)
2544 || h->root.type != bfd_link_hash_undefweak)
2545 && ((r_type != R_390_PC16
2546 && r_type != R_390_PC12DBL
2547 && r_type != R_390_PC16DBL
2548 && r_type != R_390_PC24DBL
2549 && r_type != R_390_PC32DBL
2550 && r_type != R_390_PC32)
2551 || !SYMBOL_CALLS_LOCAL (info, h)))
2552 || (ELIMINATE_COPY_RELOCS
2553 && !bfd_link_pic (info)
2554 && h != NULL
2555 && h->dynindx != -1
2556 && !h->non_got_ref
2557 && ((h->def_dynamic
2558 && !h->def_regular)
2559 || h->root.type == bfd_link_hash_undefweak
2560 || h->root.type == bfd_link_hash_undefined)))
2561 {
2562 Elf_Internal_Rela outrel;
2563 bool skip, relocate;
2564 asection *sreloc;
2565 bfd_byte *loc;
2566
2567 /* When generating a shared object, these relocations
2568 are copied into the output file to be resolved at run
2569 time. */
2570
2571 skip = false;
2572 relocate = false;
2573
2574 outrel.r_offset =
2575 _bfd_elf_section_offset (output_bfd, info, input_section,
2576 rel->r_offset);
2577 if (outrel.r_offset == (bfd_vma) -1)
2578 skip = true;
2579 else if (outrel.r_offset == (bfd_vma) -2)
2580 skip = true, relocate = true;
2581 outrel.r_offset += (input_section->output_section->vma
2582 + input_section->output_offset);
2583
2584 if (skip)
2585 memset (&outrel, 0, sizeof outrel);
2586 else if (h != NULL
2587 && h->dynindx != -1
2588 && (r_type == R_390_PC16
2589 || r_type == R_390_PC12DBL
2590 || r_type == R_390_PC16DBL
2591 || r_type == R_390_PC24DBL
2592 || r_type == R_390_PC32DBL
2593 || r_type == R_390_PC32
2594 || !bfd_link_pic (info)
2595 || !SYMBOLIC_BIND (info, h)
2596 || !h->def_regular))
2597 {
2598 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2599 outrel.r_addend = rel->r_addend;
2600 }
2601 else
2602 {
2603 /* This symbol is local, or marked to become local. */
2604 outrel.r_addend = relocation + rel->r_addend;
2605 if (r_type == R_390_32)
2606 {
2607 relocate = true;
2608 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2609 }
2610 else
2611 {
2612 long sindx;
2613
2614 if (bfd_is_abs_section (sec))
2615 sindx = 0;
2616 else if (sec == NULL || sec->owner == NULL)
2617 {
2618 bfd_set_error(bfd_error_bad_value);
2619 return false;
2620 }
2621 else
2622 {
2623 asection *osec;
2624
2625 osec = sec->output_section;
2626 sindx = elf_section_data (osec)->dynindx;
2627 if (sindx == 0)
2628 {
2629 osec = htab->elf.text_index_section;
2630 sindx = elf_section_data (osec)->dynindx;
2631 }
2632 BFD_ASSERT (sindx != 0);
2633
2634 /* We are turning this relocation into one
2635 against a section symbol, so subtract out
2636 the output section's address but not the
2637 offset of the input section in the output
2638 section. */
2639 outrel.r_addend -= osec->vma;
2640 }
2641 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2642 }
2643 }
2644
2645 sreloc = elf_section_data (input_section)->sreloc;
2646 if (sreloc == NULL)
2647 abort ();
2648
2649 loc = sreloc->contents;
2650 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2651 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2652
2653 /* If this reloc is against an external symbol, we do
2654 not want to fiddle with the addend. Otherwise, we
2655 need to include the symbol value so that it becomes
2656 an addend for the dynamic reloc. */
2657 if (! relocate)
2658 continue;
2659 }
2660 break;
2661
2662 /* Relocations for tls literal pool entries. */
2663 case R_390_TLS_IE32:
2664 if (bfd_link_pic (info))
2665 {
2666 Elf_Internal_Rela outrel;
2667 asection *sreloc;
2668 bfd_byte *loc;
2669
2670 outrel.r_offset = rel->r_offset
2671 + input_section->output_section->vma
2672 + input_section->output_offset;
2673 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2674 sreloc = elf_section_data (input_section)->sreloc;
2675 if (sreloc == NULL)
2676 abort ();
2677 loc = sreloc->contents;
2678 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2679 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2680 }
2681 /* Fall through. */
2682
2683 case R_390_TLS_GD32:
2684 case R_390_TLS_GOTIE32:
2685 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2686 tls_type = GOT_UNKNOWN;
2687 if (h == NULL && local_got_offsets)
2688 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2689 else if (h != NULL)
2690 {
2691 tls_type = elf_s390_hash_entry(h)->tls_type;
2692 if (!bfd_link_pic (info)
2693 && h->dynindx == -1
2694 && tls_type >= GOT_TLS_IE)
2695 r_type = R_390_TLS_LE32;
2696 }
2697 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2698 r_type = R_390_TLS_IE32;
2699
2700 if (r_type == R_390_TLS_LE32)
2701 {
2702 /* This relocation gets optimized away by the local exec
2703 access optimization. */
2704 BFD_ASSERT (! unresolved_reloc);
2705 bfd_put_32 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2706 contents + rel->r_offset);
2707 continue;
2708 }
2709
2710 if (htab->elf.sgot == NULL)
2711 abort ();
2712
2713 if (h != NULL)
2714 off = h->got.offset;
2715 else
2716 {
2717 if (local_got_offsets == NULL)
2718 abort ();
2719
2720 off = local_got_offsets[r_symndx];
2721 }
2722
2723 emit_tls_relocs:
2724
2725 if ((off & 1) != 0)
2726 off &= ~1;
2727 else
2728 {
2729 Elf_Internal_Rela outrel;
2730 bfd_byte *loc;
2731 int dr_type, indx;
2732
2733 if (htab->elf.srelgot == NULL)
2734 abort ();
2735
2736 outrel.r_offset = (htab->elf.sgot->output_section->vma
2737 + htab->elf.sgot->output_offset + off);
2738
2739 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2740 if (r_type == R_390_TLS_GD32)
2741 dr_type = R_390_TLS_DTPMOD;
2742 else
2743 dr_type = R_390_TLS_TPOFF;
2744 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2745 outrel.r_addend = relocation - dtpoff_base (info);
2746 else
2747 outrel.r_addend = 0;
2748 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2749 loc = htab->elf.srelgot->contents;
2750 loc += htab->elf.srelgot->reloc_count++
2751 * sizeof (Elf32_External_Rela);
2752 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2753
2754 if (r_type == R_390_TLS_GD32)
2755 {
2756 if (indx == 0)
2757 {
2758 BFD_ASSERT (! unresolved_reloc);
2759 bfd_put_32 (output_bfd,
2760 relocation - dtpoff_base (info),
2761 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2762 }
2763 else
2764 {
2765 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2766 outrel.r_offset += GOT_ENTRY_SIZE;
2767 outrel.r_addend = 0;
2768 htab->elf.srelgot->reloc_count++;
2769 loc += sizeof (Elf32_External_Rela);
2770 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2771 }
2772 }
2773
2774 if (h != NULL)
2775 h->got.offset |= 1;
2776 else
2777 local_got_offsets[r_symndx] |= 1;
2778 }
2779
2780 if (off >= (bfd_vma) -2)
2781 abort ();
2782 if (r_type == ELF32_R_TYPE (rel->r_info))
2783 {
2784 relocation = htab->elf.sgot->output_offset + off;
2785 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2786 relocation += htab->elf.sgot->output_section->vma;
2787 unresolved_reloc = false;
2788 }
2789 else
2790 {
2791 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
2792 contents + rel->r_offset);
2793 continue;
2794 }
2795 break;
2796
2797 case R_390_TLS_GOTIE12:
2798 case R_390_TLS_GOTIE20:
2799 case R_390_TLS_IEENT:
2800 if (h == NULL)
2801 {
2802 if (local_got_offsets == NULL)
2803 abort();
2804 off = local_got_offsets[r_symndx];
2805 if (bfd_link_pic (info))
2806 goto emit_tls_relocs;
2807 }
2808 else
2809 {
2810 off = h->got.offset;
2811 tls_type = elf_s390_hash_entry(h)->tls_type;
2812 if (bfd_link_pic (info)
2813 || h->dynindx != -1
2814 || tls_type < GOT_TLS_IE)
2815 goto emit_tls_relocs;
2816 }
2817
2818 if (htab->elf.sgot == NULL)
2819 abort ();
2820
2821 BFD_ASSERT (! unresolved_reloc);
2822 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2823 htab->elf.sgot->contents + off);
2824 relocation = htab->elf.sgot->output_offset + off;
2825 if (r_type == R_390_TLS_IEENT)
2826 relocation += htab->elf.sgot->output_section->vma;
2827 unresolved_reloc = false;
2828 break;
2829
2830 case R_390_TLS_LDM32:
2831 if (! bfd_link_pic (info))
2832 /* The literal pool entry this relocation refers to gets ignored
2833 by the optimized code of the local exec model. Do nothing
2834 and the value will turn out zero. */
2835 continue;
2836
2837 if (htab->elf.sgot == NULL)
2838 abort ();
2839
2840 off = htab->tls_ldm_got.offset;
2841 if (off & 1)
2842 off &= ~1;
2843 else
2844 {
2845 Elf_Internal_Rela outrel;
2846 bfd_byte *loc;
2847
2848 if (htab->elf.srelgot == NULL)
2849 abort ();
2850
2851 outrel.r_offset = (htab->elf.sgot->output_section->vma
2852 + htab->elf.sgot->output_offset + off);
2853
2854 bfd_put_32 (output_bfd, 0,
2855 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2856 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2857 outrel.r_addend = 0;
2858 loc = htab->elf.srelgot->contents;
2859 loc += htab->elf.srelgot->reloc_count++
2860 * sizeof (Elf32_External_Rela);
2861 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2862 htab->tls_ldm_got.offset |= 1;
2863 }
2864 relocation = htab->elf.sgot->output_offset + off;
2865 unresolved_reloc = false;
2866 break;
2867
2868 case R_390_TLS_LE32:
2869 if (bfd_link_dll (info))
2870 {
2871 /* Linking a shared library with non-fpic code requires
2872 a R_390_TLS_TPOFF relocation. */
2873 Elf_Internal_Rela outrel;
2874 asection *sreloc;
2875 bfd_byte *loc;
2876 int indx;
2877
2878 outrel.r_offset = rel->r_offset
2879 + input_section->output_section->vma
2880 + input_section->output_offset;
2881 if (h != NULL && h->dynindx != -1)
2882 indx = h->dynindx;
2883 else
2884 indx = 0;
2885 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2886 if (indx == 0)
2887 outrel.r_addend = relocation - dtpoff_base (info);
2888 else
2889 outrel.r_addend = 0;
2890 sreloc = elf_section_data (input_section)->sreloc;
2891 if (sreloc == NULL)
2892 abort ();
2893 loc = sreloc->contents;
2894 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2895 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2896 }
2897 else
2898 {
2899 BFD_ASSERT (! unresolved_reloc);
2900 bfd_put_32 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2901 contents + rel->r_offset);
2902 }
2903 continue;
2904
2905 case R_390_TLS_LDO32:
2906 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
2907 relocation -= dtpoff_base (info);
2908 else
2909 /* When converting LDO to LE, we must negate. */
2910 relocation = -tpoff (info, relocation);
2911 break;
2912
2913 /* Relocations for tls instructions. */
2914 case R_390_TLS_LOAD:
2915 case R_390_TLS_GDCALL:
2916 case R_390_TLS_LDCALL:
2917 tls_type = GOT_UNKNOWN;
2918 if (h == NULL && local_got_offsets)
2919 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2920 else if (h != NULL)
2921 tls_type = elf_s390_hash_entry(h)->tls_type;
2922
2923 if (tls_type == GOT_TLS_GD)
2924 continue;
2925
2926 if (r_type == R_390_TLS_LOAD)
2927 {
2928 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
2929 {
2930 /* IE->LE transition. Four valid cases:
2931 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2932 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2933 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2934 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2935 unsigned int insn, ry;
2936
2937 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2938 if ((insn & 0xff00f000) == 0x58000000)
2939 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2940 ry = (insn & 0x000f0000);
2941 else if ((insn & 0xff0f0000) == 0x58000000)
2942 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2943 ry = (insn & 0x0000f000) << 4;
2944 else if ((insn & 0xff00f000) == 0x5800c000)
2945 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2946 ry = (insn & 0x000f0000);
2947 else if ((insn & 0xff0f0000) == 0x580c0000)
2948 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2949 ry = (insn & 0x0000f000) << 4;
2950 else
2951 {
2952 invalid_tls_insn (input_bfd, input_section, rel);
2953 return false;
2954 }
2955 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2956 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2957 }
2958 }
2959 else if (r_type == R_390_TLS_GDCALL)
2960 {
2961 unsigned int insn;
2962
2963 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2964 if ((insn & 0xff000fff) != 0x4d000000 &&
2965 (insn & 0xffff0000) != 0xc0e50000 &&
2966 (insn & 0xff000000) != 0x0d000000)
2967 {
2968 invalid_tls_insn (input_bfd, input_section, rel);
2969 return false;
2970 }
2971 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
2972 {
2973 if ((insn & 0xff000000) == 0x0d000000)
2974 {
2975 /* GD->LE transition.
2976 basr rx, ry -> nopr r7 */
2977 insn = 0x07070000 | (insn & 0xffff);
2978 }
2979 else if ((insn & 0xff000000) == 0x4d000000)
2980 {
2981 /* GD->LE transition.
2982 bas %r14,0(%rx,%r13) -> bc 0,0 */
2983 insn = 0x47000000;
2984 }
2985 else
2986 {
2987 /* GD->LE transition.
2988 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
2989 insn = 0xc0040000;
2990 bfd_put_16 (output_bfd, 0x0000,
2991 contents + rel->r_offset + 4);
2992 }
2993 }
2994 else
2995 {
2996 /* If basr is used in the pic case to invoke
2997 _tls_get_offset, something went wrong before. */
2998 if ((insn & 0xff000000) == 0x0d000000)
2999 {
3000 invalid_tls_insn (input_bfd, input_section, rel);
3001 return false;
3002 }
3003
3004 if ((insn & 0xff000000) == 0x4d000000)
3005 {
3006 /* GD->IE transition.
3007 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3008 insn = 0x5822c000;
3009 }
3010 else
3011 {
3012 /* GD->IE transition.
3013 brasl %r14,__tls_get_addr@plt ->
3014 l %r2,0(%r2,%r12) ; bcr 0,0 */
3015 insn = 0x5822c000;
3016 bfd_put_16 (output_bfd, 0x0700,
3017 contents + rel->r_offset + 4);
3018 }
3019 }
3020 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3021 }
3022 else if (r_type == R_390_TLS_LDCALL)
3023 {
3024 if (!bfd_link_pic (info))
3025 {
3026 unsigned int insn;
3027
3028 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3029 if ((insn & 0xff000fff) != 0x4d000000 &&
3030 (insn & 0xffff0000) != 0xc0e50000 &&
3031 (insn & 0xff000000) != 0x0d000000)
3032 {
3033 invalid_tls_insn (input_bfd, input_section, rel);
3034 return false;
3035 }
3036
3037 if ((insn & 0xff000000) == 0x0d000000)
3038 {
3039 /* LD->LE transition.
3040 basr rx, ry -> nopr r7 */
3041 insn = 0x07070000 | (insn & 0xffff);
3042 }
3043 else if ((insn & 0xff000000) == 0x4d000000)
3044 {
3045 /* LD->LE transition.
3046 bas %r14,0(%rx,%r13) -> bc 0,0 */
3047 insn = 0x47000000;
3048 }
3049 else
3050 {
3051 /* LD->LE transition.
3052 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3053 insn = 0xc0040000;
3054 bfd_put_16 (output_bfd, 0x0000,
3055 contents + rel->r_offset + 4);
3056 }
3057 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3058 }
3059 }
3060 continue;
3061
3062 default:
3063 break;
3064 }
3065
3066 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3067 because such sections are not SEC_ALLOC and thus ld.so will
3068 not process them. */
3069 if (unresolved_reloc
3070 && !((input_section->flags & SEC_DEBUGGING) != 0
3071 && h->def_dynamic)
3072 && _bfd_elf_section_offset (output_bfd, info, input_section,
3073 rel->r_offset) != (bfd_vma) -1)
3074 _bfd_error_handler
3075 /* xgettext:c-format */
3076 (_("%pB(%pA+%#" PRIx64 "): "
3077 "unresolvable %s relocation against symbol `%s'"),
3078 input_bfd,
3079 input_section,
3080 (uint64_t) rel->r_offset,
3081 howto->name,
3082 h->root.root.string);
3083
3084 do_relocation:
3085
3086 /* When applying a 24 bit reloc we need to start one byte
3087 earlier. Otherwise the 32 bit get/put bfd operations might
3088 access a byte after the actual section. */
3089 if (r_type == R_390_PC24DBL
3090 || r_type == R_390_PLT24DBL)
3091 rel->r_offset--;
3092
3093 if (r_type == R_390_20
3094 || r_type == R_390_GOT20
3095 || r_type == R_390_GOTPLT20
3096 || r_type == R_390_TLS_GOTIE20)
3097 {
3098 relocation += rel->r_addend;
3099 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3100 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3101 contents, rel->r_offset,
3102 relocation, 0);
3103 }
3104 else
3105 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3106 contents, rel->r_offset,
3107 relocation, rel->r_addend);
3108
3109 if (r != bfd_reloc_ok)
3110 {
3111 const char *name;
3112
3113 if (h != NULL)
3114 name = h->root.root.string;
3115 else
3116 {
3117 name = bfd_elf_string_from_elf_section (input_bfd,
3118 symtab_hdr->sh_link,
3119 sym->st_name);
3120 if (name == NULL)
3121 return false;
3122 if (*name == '\0')
3123 name = bfd_section_name (sec);
3124 }
3125
3126 if (r == bfd_reloc_overflow)
3127 (*info->callbacks->reloc_overflow)
3128 (info, (h ? &h->root : NULL), name, howto->name,
3129 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3130 else
3131 {
3132 _bfd_error_handler
3133 /* xgettext:c-format */
3134 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3135 input_bfd, input_section,
3136 (uint64_t) rel->r_offset, name, (int) r);
3137 return false;
3138 }
3139 }
3140 }
3141
3142 return true;
3143 }
3144
3145 /* Generate the PLT slots together with the dynamic relocations needed
3146 for IFUNC symbols. */
3147
3148 static void
elf_s390_finish_ifunc_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,struct elf_s390_link_hash_table * htab,bfd_vma iplt_offset,bfd_vma resolver_address)3149 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3150 struct bfd_link_info *info,
3151 struct elf_link_hash_entry *h,
3152 struct elf_s390_link_hash_table *htab,
3153 bfd_vma iplt_offset,
3154 bfd_vma resolver_address)
3155 {
3156 bfd_vma iplt_index;
3157 bfd_vma got_offset;
3158 bfd_vma igotiplt_offset;
3159 Elf_Internal_Rela rela;
3160 bfd_byte *loc;
3161 asection *plt, *gotplt, *relplt;
3162 bfd_vma relative_offset;
3163
3164 if (htab->elf.iplt == NULL
3165 || htab->elf.igotplt == NULL
3166 || htab->elf.irelplt == NULL)
3167 abort ();
3168
3169 gotplt = htab->elf.igotplt;
3170 relplt = htab->elf.irelplt;
3171
3172 /* Index of the PLT slot within iplt section. */
3173 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3174 plt = htab->elf.iplt;
3175 /* Offset into the igot.plt section. */
3176 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3177 /* Offset into the got section. */
3178 got_offset = igotiplt_offset + gotplt->output_offset;
3179
3180 /* S390 uses halfwords for relative branch calc! */
3181 relative_offset = - (plt->output_offset +
3182 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3183 /* If offset is > 32768, branch to a previous branch
3184 390 can only handle +-64 K jumps. */
3185 if ( -32768 > (int) relative_offset )
3186 relative_offset
3187 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3188
3189 /* Fill in the entry in the procedure linkage table. */
3190 if (!bfd_link_pic (info))
3191 {
3192 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3193 PLT_ENTRY_SIZE);
3194
3195 /* Adjust jump to the first plt entry. */
3196 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3197 plt->contents + iplt_offset + 20);
3198
3199 /* Push the GOT offset field. */
3200 bfd_put_32 (output_bfd,
3201 (gotplt->output_section->vma
3202 + got_offset),
3203 plt->contents + iplt_offset + 24);
3204 }
3205 else if (got_offset < 4096)
3206 {
3207 /* The GOT offset is small enough to be used directly as
3208 displacement. */
3209 memcpy (plt->contents + iplt_offset,
3210 elf_s390_plt_pic12_entry,
3211 PLT_ENTRY_SIZE);
3212
3213 /* Put in the GOT offset as displacement value. The 0xc000
3214 value comes from the first word of the plt entry. Look
3215 at the elf_s390_plt_pic16_entry content. */
3216 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3217 plt->contents + iplt_offset + 2);
3218
3219 /* Adjust the jump to the first plt entry. */
3220 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3221 plt->contents + iplt_offset + 20);
3222 }
3223 else if (got_offset < 32768)
3224 {
3225 /* The GOT offset is too big for a displacement but small
3226 enough to be a signed 16 bit immediate value as it can be
3227 used in an lhi instruction. */
3228 memcpy (plt->contents + iplt_offset,
3229 elf_s390_plt_pic16_entry,
3230 PLT_ENTRY_SIZE);
3231
3232 /* Put in the GOT offset for the lhi instruction. */
3233 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3234 plt->contents + iplt_offset + 2);
3235
3236 /* Adjust the jump to the first plt entry. */
3237 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3238 plt->contents + iplt_offset + 20);
3239 }
3240 else
3241 {
3242 memcpy (plt->contents + iplt_offset,
3243 elf_s390_plt_pic_entry,
3244 PLT_ENTRY_SIZE);
3245
3246 /* Adjust the jump to the first plt entry. */
3247 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3248 plt->contents + iplt_offset + 20);
3249
3250 /* Push the GOT offset field. */
3251 bfd_put_32 (output_bfd, got_offset,
3252 plt->contents + iplt_offset + 24);
3253 }
3254 /* Insert offset into reloc. table here. */
3255 bfd_put_32 (output_bfd, relplt->output_offset +
3256 iplt_index * RELA_ENTRY_SIZE,
3257 plt->contents + iplt_offset + 28);
3258
3259 /* Fill in the entry in the global offset table.
3260 Points to instruction after GOT offset. */
3261 bfd_put_32 (output_bfd,
3262 (plt->output_section->vma
3263 + plt->output_offset
3264 + iplt_offset
3265 + 12),
3266 gotplt->contents + igotiplt_offset);
3267
3268 /* Fill in the entry in the .rela.plt section. */
3269 rela.r_offset = gotplt->output_section->vma + got_offset;
3270
3271 if (!h
3272 || h->dynindx == -1
3273 || ((bfd_link_executable (info)
3274 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3275 && h->def_regular))
3276 {
3277 /* The symbol can be locally resolved. */
3278 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3279 rela.r_addend = resolver_address;
3280 }
3281 else
3282 {
3283 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3284 rela.r_addend = 0;
3285 }
3286
3287 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3288 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3289 }
3290
3291 /* Finish up dynamic symbol handling. We set the contents of various
3292 dynamic sections here. */
3293
3294 static bool
elf_s390_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)3295 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3296 struct bfd_link_info *info,
3297 struct elf_link_hash_entry *h,
3298 Elf_Internal_Sym *sym)
3299 {
3300 struct elf_s390_link_hash_table *htab;
3301 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3302
3303 htab = elf_s390_hash_table (info);
3304
3305 if (h->plt.offset != (bfd_vma) -1)
3306 {
3307 bfd_vma plt_index;
3308 bfd_vma got_offset;
3309 Elf_Internal_Rela rela;
3310 bfd_byte *loc;
3311 bfd_vma relative_offset;
3312
3313 /* This symbol has an entry in the procedure linkage table. Set
3314 it up. */
3315 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3316 {
3317 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3318 htab, h->plt.offset,
3319 eh->ifunc_resolver_address +
3320 eh->ifunc_resolver_section->output_offset +
3321 eh->ifunc_resolver_section->output_section->vma);
3322 /* Do not return yet. Handling of explicit GOT slots of
3323 IFUNC symbols is below. */
3324 }
3325 else
3326 {
3327 if (h->dynindx == -1
3328 || htab->elf.splt == NULL
3329 || htab->elf.sgotplt == NULL
3330 || htab->elf.srelplt == NULL)
3331 abort ();
3332
3333 /* Calc. index no.
3334 Current offset - size first entry / entry size. */
3335 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3336
3337 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3338 addr & GOT addr. */
3339 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3340
3341 /* S390 uses halfwords for relative branch calc! */
3342 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3343 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3344 /* If offset is > 32768, branch to a previous branch
3345 390 can only handle +-64 K jumps. */
3346 if ( -32768 > (int) relative_offset )
3347 relative_offset
3348 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3349
3350 /* Fill in the entry in the procedure linkage table. */
3351 if (!bfd_link_pic (info))
3352 {
3353 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3354 PLT_ENTRY_SIZE);
3355
3356 /* Adjust jump to the first plt entry. */
3357 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3358 htab->elf.splt->contents + h->plt.offset + 20);
3359
3360 /* Push the GOT offset field. */
3361 bfd_put_32 (output_bfd,
3362 (htab->elf.sgotplt->output_section->vma
3363 + htab->elf.sgotplt->output_offset
3364 + got_offset),
3365 htab->elf.splt->contents + h->plt.offset + 24);
3366 }
3367 else if (got_offset < 4096)
3368 {
3369 /* The GOT offset is small enough to be used directly as
3370 displacement. */
3371 memcpy (htab->elf.splt->contents + h->plt.offset,
3372 elf_s390_plt_pic12_entry,
3373 PLT_ENTRY_SIZE);
3374
3375 /* Put in the GOT offset as displacement value. The 0xc000
3376 value comes from the first word of the plt entry. Look
3377 at the elf_s390_plt_pic12_entry content. */
3378 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3379 htab->elf.splt->contents + h->plt.offset + 2);
3380
3381 /* Adjust the jump to the first plt entry. */
3382 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3383 htab->elf.splt->contents + h->plt.offset + 20);
3384 }
3385 else if (got_offset < 32768)
3386 {
3387 /* The GOT offset is too big for a displacement but small
3388 enough to be a signed 16 bit immediate value as it can be
3389 used in an lhi instruction. */
3390 memcpy (htab->elf.splt->contents + h->plt.offset,
3391 elf_s390_plt_pic16_entry,
3392 PLT_ENTRY_SIZE);
3393
3394 /* Put in the GOT offset for the lhi instruction. */
3395 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3396 htab->elf.splt->contents + h->plt.offset + 2);
3397
3398 /* Adjust the jump to the first plt entry. */
3399 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3400 htab->elf.splt->contents + h->plt.offset + 20);
3401 }
3402 else
3403 {
3404 memcpy (htab->elf.splt->contents + h->plt.offset,
3405 elf_s390_plt_pic_entry,
3406 PLT_ENTRY_SIZE);
3407
3408 /* Adjust the jump to the first plt entry. */
3409 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3410 htab->elf.splt->contents + h->plt.offset + 20);
3411
3412 /* Push the GOT offset field. */
3413 bfd_put_32 (output_bfd, got_offset,
3414 htab->elf.splt->contents + h->plt.offset + 24);
3415 }
3416 /* Insert offset into reloc. table here. */
3417 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3418 htab->elf.splt->contents + h->plt.offset + 28);
3419
3420 /* Fill in the entry in the global offset table.
3421 Points to instruction after GOT offset. */
3422 bfd_put_32 (output_bfd,
3423 (htab->elf.splt->output_section->vma
3424 + htab->elf.splt->output_offset
3425 + h->plt.offset
3426 + 12),
3427 htab->elf.sgotplt->contents + got_offset);
3428
3429 /* Fill in the entry in the .rela.plt section. */
3430 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3431 + htab->elf.sgotplt->output_offset
3432 + got_offset);
3433 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3434 rela.r_addend = 0;
3435 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3436 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3437
3438 if (!h->def_regular)
3439 {
3440 /* Mark the symbol as undefined, rather than as defined in
3441 the .plt section. Leave the value alone. This is a clue
3442 for the dynamic linker, to make function pointer
3443 comparisons work between an application and shared
3444 library. */
3445 sym->st_shndx = SHN_UNDEF;
3446 }
3447 }
3448 }
3449
3450 if (h->got.offset != (bfd_vma) -1
3451 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3452 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3453 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3454 {
3455 Elf_Internal_Rela rela;
3456 bfd_byte *loc;
3457
3458 /* This symbol has an entry in the global offset table. Set it
3459 up. */
3460
3461 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3462 abort ();
3463
3464 rela.r_offset = (htab->elf.sgot->output_section->vma
3465 + htab->elf.sgot->output_offset
3466 + (h->got.offset &~ (bfd_vma) 1));
3467
3468 /* If this is a static link, or it is a -Bsymbolic link and the
3469 symbol is defined locally or was forced to be local because
3470 of a version file, we just want to emit a RELATIVE reloc.
3471 The entry in the global offset table will already have been
3472 initialized in the relocate_section function. */
3473 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3474 {
3475 if (bfd_link_pic (info))
3476 {
3477 /* An explicit GOT slot usage needs GLOB_DAT. If the
3478 symbol references local the implicit got.iplt slot
3479 will be used and the IRELATIVE reloc has been created
3480 above. */
3481 goto do_glob_dat;
3482 }
3483 else
3484 {
3485 /* For non-shared objects explicit GOT slots must be
3486 filled with the PLT slot address for pointer
3487 equality reasons. */
3488 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3489 + htab->elf.iplt->output_offset
3490 + h->plt.offset),
3491 htab->elf.sgot->contents + h->got.offset);
3492 return true;
3493 }
3494 }
3495 else if (bfd_link_pic (info)
3496 && SYMBOL_REFERENCES_LOCAL (info, h))
3497 {
3498 if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
3499 return true;
3500
3501 /* If this is a static link, or it is a -Bsymbolic link and
3502 the symbol is defined locally or was forced to be local
3503 because of a version file, we just want to emit a
3504 RELATIVE reloc. The entry in the global offset table
3505 will already have been initialized in the
3506 relocate_section function. */
3507 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
3508 return false;
3509 BFD_ASSERT((h->got.offset & 1) != 0);
3510 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3511 rela.r_addend = (h->root.u.def.value
3512 + h->root.u.def.section->output_section->vma
3513 + h->root.u.def.section->output_offset);
3514 }
3515 else
3516 {
3517 BFD_ASSERT((h->got.offset & 1) == 0);
3518 do_glob_dat:
3519 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3520 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3521 rela.r_addend = 0;
3522 }
3523
3524 loc = htab->elf.srelgot->contents;
3525 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3526 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3527 }
3528
3529 if (h->needs_copy)
3530 {
3531 Elf_Internal_Rela rela;
3532 asection *s;
3533 bfd_byte *loc;
3534
3535 /* This symbols needs a copy reloc. Set it up. */
3536
3537 if (h->dynindx == -1
3538 || (h->root.type != bfd_link_hash_defined
3539 && h->root.type != bfd_link_hash_defweak)
3540 || htab->elf.srelbss == NULL
3541 || htab->elf.sreldynrelro == NULL)
3542 abort ();
3543
3544 rela.r_offset = (h->root.u.def.value
3545 + h->root.u.def.section->output_section->vma
3546 + h->root.u.def.section->output_offset);
3547 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3548 rela.r_addend = 0;
3549 if (h->root.u.def.section == htab->elf.sdynrelro)
3550 s = htab->elf.sreldynrelro;
3551 else
3552 s = htab->elf.srelbss;
3553 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
3554 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3555 }
3556
3557 /* Mark some specially defined symbols as absolute. */
3558 if (h == htab->elf.hdynamic
3559 || h == htab->elf.hgot
3560 || h == htab->elf.hplt)
3561 sym->st_shndx = SHN_ABS;
3562
3563 return true;
3564 }
3565
3566 /* Used to decide how to sort relocs in an optimal manner for the
3567 dynamic linker, before writing them out. */
3568
3569 static enum elf_reloc_type_class
elf_s390_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)3570 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3571 const asection *rel_sec ATTRIBUTE_UNUSED,
3572 const Elf_Internal_Rela *rela)
3573 {
3574 bfd *abfd = info->output_bfd;
3575 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3576 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3577 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3578 Elf_Internal_Sym sym;
3579
3580 if (htab->elf.dynsym == NULL
3581 || !bed->s->swap_symbol_in (abfd,
3582 (htab->elf.dynsym->contents
3583 + r_symndx * bed->s->sizeof_sym),
3584 0, &sym))
3585 abort ();
3586
3587 /* Check relocation against STT_GNU_IFUNC symbol. */
3588 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3589 return reloc_class_ifunc;
3590
3591 switch ((int) ELF32_R_TYPE (rela->r_info))
3592 {
3593 case R_390_RELATIVE:
3594 return reloc_class_relative;
3595 case R_390_JMP_SLOT:
3596 return reloc_class_plt;
3597 case R_390_COPY:
3598 return reloc_class_copy;
3599 default:
3600 return reloc_class_normal;
3601 }
3602 }
3603
3604 /* Finish up the dynamic sections. */
3605
3606 static bool
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3607 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3608 struct bfd_link_info *info)
3609 {
3610 struct elf_s390_link_hash_table *htab;
3611 bfd *dynobj;
3612 asection *sdyn;
3613 bfd *ibfd;
3614 unsigned int i;
3615
3616 htab = elf_s390_hash_table (info);
3617 dynobj = htab->elf.dynobj;
3618 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3619
3620 if (htab->elf.dynamic_sections_created)
3621 {
3622 Elf32_External_Dyn *dyncon, *dynconend;
3623
3624 if (sdyn == NULL || htab->elf.sgot == NULL)
3625 abort ();
3626
3627 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3628 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3629 for (; dyncon < dynconend; dyncon++)
3630 {
3631 Elf_Internal_Dyn dyn;
3632 asection *s;
3633
3634 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3635
3636 switch (dyn.d_tag)
3637 {
3638 default:
3639 continue;
3640
3641 case DT_PLTGOT:
3642 s = htab->elf.sgotplt;
3643 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3644 break;
3645
3646 case DT_JMPREL:
3647 s = htab->elf.srelplt;
3648 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3649 break;
3650
3651 case DT_PLTRELSZ:
3652 dyn.d_un.d_val = htab->elf.srelplt->size;
3653 if (htab->elf.irelplt)
3654 dyn.d_un.d_val += htab->elf.irelplt->size;
3655 break;
3656 }
3657
3658 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3659 }
3660
3661 /* Fill in the special first entry in the procedure linkage table. */
3662 if (htab->elf.splt && htab->elf.splt->size > 0)
3663 {
3664 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3665 if (bfd_link_pic (info))
3666 {
3667 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3668 PLT_FIRST_ENTRY_SIZE);
3669 }
3670 else
3671 {
3672 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3673 PLT_FIRST_ENTRY_SIZE);
3674 bfd_put_32 (output_bfd,
3675 htab->elf.sgotplt->output_section->vma
3676 + htab->elf.sgotplt->output_offset,
3677 htab->elf.splt->contents + 24);
3678 }
3679 elf_section_data (htab->elf.splt->output_section)
3680 ->this_hdr.sh_entsize = 4;
3681 }
3682
3683 }
3684
3685 if (htab->elf.sgotplt)
3686 {
3687 /* Fill in the first three entries in the global offset table. */
3688 if (htab->elf.sgotplt->size > 0)
3689 {
3690 bfd_put_32 (output_bfd,
3691 (sdyn == NULL ? (bfd_vma) 0
3692 : sdyn->output_section->vma + sdyn->output_offset),
3693 htab->elf.sgotplt->contents);
3694 /* One entry for shared object struct ptr. */
3695 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3696 /* One entry for _dl_runtime_resolve. */
3697 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3698 }
3699
3700 elf_section_data (htab->elf.sgotplt->output_section)
3701 ->this_hdr.sh_entsize = 4;
3702 }
3703 /* Finish dynamic symbol for local IFUNC symbols. */
3704 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3705 {
3706 struct plt_entry *local_plt;
3707 Elf_Internal_Sym *isym;
3708 Elf_Internal_Shdr *symtab_hdr;
3709
3710 symtab_hdr = &elf_symtab_hdr (ibfd);
3711
3712 if (!is_s390_elf (ibfd))
3713 continue;
3714
3715 local_plt = elf_s390_local_plt (ibfd);
3716 if (local_plt != NULL)
3717 for (i = 0; i < symtab_hdr->sh_info; i++)
3718 {
3719 if (local_plt[i].plt.offset != (bfd_vma) -1)
3720 {
3721 asection *sec = local_plt[i].sec;
3722 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i);
3723 if (isym == NULL)
3724 return false;
3725
3726 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3727 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3728 local_plt[i].plt.offset,
3729 isym->st_value
3730 + sec->output_section->vma
3731 + sec->output_offset);
3732
3733 }
3734 }
3735 }
3736 return true;
3737 }
3738
3739 /* Support for core dump NOTE sections. */
3740
3741 static bool
elf_s390_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)3742 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3743 {
3744 int offset;
3745 unsigned int size;
3746
3747 switch (note->descsz)
3748 {
3749 default:
3750 return false;
3751
3752 case 224: /* S/390 Linux. */
3753 /* pr_cursig */
3754 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3755
3756 /* pr_pid */
3757 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
3758
3759 /* pr_reg */
3760 offset = 72;
3761 size = 144;
3762 break;
3763 }
3764
3765 /* Make a ".reg/999" section. */
3766 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3767 size, note->descpos + offset);
3768 }
3769
3770 static bool
elf_s390_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)3771 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3772 {
3773 switch (note->descsz)
3774 {
3775 default:
3776 return false;
3777
3778 case 124: /* sizeof(struct elf_prpsinfo) on s390 */
3779 elf_tdata (abfd)->core->pid
3780 = bfd_get_32 (abfd, note->descdata + 12);
3781 elf_tdata (abfd)->core->program
3782 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
3783 elf_tdata (abfd)->core->command
3784 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
3785 break;
3786 }
3787
3788 /* Note that for some reason, a spurious space is tacked
3789 onto the end of the args in some (at least one anyway)
3790 implementations, so strip it off if it exists. */
3791
3792 {
3793 char *command = elf_tdata (abfd)->core->command;
3794 int n = strlen (command);
3795
3796 if (0 < n && command[n - 1] == ' ')
3797 command[n - 1] = '\0';
3798 }
3799
3800 return true;
3801 }
3802
3803 static char *
elf_s390_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)3804 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3805 int note_type, ...)
3806 {
3807 va_list ap;
3808
3809 switch (note_type)
3810 {
3811 default:
3812 return NULL;
3813
3814 case NT_PRPSINFO:
3815 {
3816 char data[124] ATTRIBUTE_NONSTRING = { 0 };
3817 const char *fname, *psargs;
3818
3819 va_start (ap, note_type);
3820 fname = va_arg (ap, const char *);
3821 psargs = va_arg (ap, const char *);
3822 va_end (ap);
3823
3824 strncpy (data + 28, fname, 16);
3825 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3826 DIAGNOSTIC_PUSH;
3827 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
3828 -Wstringop-truncation:
3829 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
3830 */
3831 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
3832 #endif
3833 strncpy (data + 44, psargs, 80);
3834 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3835 DIAGNOSTIC_POP;
3836 #endif
3837 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3838 &data, sizeof (data));
3839 }
3840
3841 case NT_PRSTATUS:
3842 {
3843 char data[224] = { 0 };
3844 long pid;
3845 int cursig;
3846 const void *gregs;
3847
3848 va_start (ap, note_type);
3849 pid = va_arg (ap, long);
3850 cursig = va_arg (ap, int);
3851 gregs = va_arg (ap, const void *);
3852 va_end (ap);
3853
3854 bfd_put_16 (abfd, cursig, data + 12);
3855 bfd_put_32 (abfd, pid, data + 24);
3856 memcpy (data + 72, gregs, 144);
3857 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3858 &data, sizeof (data));
3859 }
3860 }
3861 /* NOTREACHED */
3862 }
3863
3864 /* Return address for Ith PLT stub in section PLT, for relocation REL
3865 or (bfd_vma) -1 if it should not be included. */
3866
3867 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3868 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3869 const arelent *rel ATTRIBUTE_UNUSED)
3870 {
3871 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3872 }
3873
3874 /* Merge backend specific data from an object file to the output
3875 object file when linking. */
3876
3877 static bool
elf32_s390_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)3878 elf32_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3879 {
3880 bfd *obfd = info->output_bfd;
3881
3882 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
3883 return true;
3884
3885 if (!elf_s390_merge_obj_attributes (ibfd, info))
3886 return false;
3887
3888 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3889 return true;
3890 }
3891
3892
3893 #define TARGET_BIG_SYM s390_elf32_vec
3894 #define TARGET_BIG_NAME "elf32-s390"
3895 #define ELF_ARCH bfd_arch_s390
3896 #define ELF_TARGET_ID S390_ELF_DATA
3897 #define ELF_MACHINE_CODE EM_S390
3898 #define ELF_MACHINE_ALT1 EM_S390_OLD
3899 #define ELF_MAXPAGESIZE 0x1000
3900
3901 #define elf_backend_can_gc_sections 1
3902 #define elf_backend_can_refcount 1
3903 #define elf_backend_want_got_plt 1
3904 #define elf_backend_plt_readonly 1
3905 #define elf_backend_want_plt_sym 0
3906 #define elf_backend_got_header_size 12
3907 #define elf_backend_want_dynrelro 1
3908 #define elf_backend_rela_normal 1
3909
3910 #define elf_info_to_howto elf_s390_info_to_howto
3911
3912 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3913 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3914 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3915 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3916
3917 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
3918
3919 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3920 #define elf_backend_check_relocs elf_s390_check_relocs
3921 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3922 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3923 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3924 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3925 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3926 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3927 #define elf_backend_relocate_section elf_s390_relocate_section
3928 #define elf_backend_late_size_sections elf_s390_late_size_sections
3929 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3930 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3931 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
3932 #define elf_backend_write_core_note elf_s390_write_core_note
3933 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3934 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
3935
3936 #define bfd_elf32_mkobject elf_s390_mkobject
3937 #define elf_backend_object_p elf_s390_object_p
3938
3939 #define elf_backend_linux_prpsinfo32_ugid16 true
3940
3941 #include "elf32-target.h"
3942