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_size_dynamic_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 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1451 && h->root.type != bfd_link_hash_undefweak))
1452 {
1453 /* This case can occur if we saw a PLT32 reloc in an input
1454 file, but the symbol was never referred to by a dynamic
1455 object, or if all references were garbage collected. In
1456 such a case, we don't actually need to build a procedure
1457 linkage table, and we can just do a PC32 reloc instead. */
1458 h->plt.offset = (bfd_vma) -1;
1459 h->needs_plt = 0;
1460 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1461 }
1462
1463 return true;
1464 }
1465 else
1466 /* It's possible that we incorrectly decided a .plt reloc was
1467 needed for an R_390_PC32 reloc to a non-function sym in
1468 check_relocs. We can't decide accurately between function and
1469 non-function syms in check-relocs; Objects loaded later in
1470 the link may change h->type. So fix it now. */
1471 h->plt.offset = (bfd_vma) -1;
1472
1473 /* If this is a weak symbol, and there is a real definition, the
1474 processor independent code will have arranged for us to see the
1475 real definition first, and we can just use the same value. */
1476 if (h->is_weakalias)
1477 {
1478 struct elf_link_hash_entry *def = weakdef (h);
1479 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1480 h->root.u.def.section = def->root.u.def.section;
1481 h->root.u.def.value = def->root.u.def.value;
1482 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1483 h->non_got_ref = def->non_got_ref;
1484 return true;
1485 }
1486
1487 /* This is a reference to a symbol defined by a dynamic object which
1488 is not a function. */
1489
1490 /* If we are creating a shared library, we must presume that the
1491 only references to the symbol are via the global offset table.
1492 For such cases we need not do anything here; the relocations will
1493 be handled correctly by relocate_section. */
1494 if (bfd_link_pic (info))
1495 return true;
1496
1497 /* If there are no references to this symbol that do not use the
1498 GOT, we don't need to generate a copy reloc. */
1499 if (!h->non_got_ref)
1500 return true;
1501
1502 /* If -z nocopyreloc was given, we won't generate them either. */
1503 if (info->nocopyreloc)
1504 {
1505 h->non_got_ref = 0;
1506 return true;
1507 }
1508
1509 /* If we don't find any dynamic relocs in read-only sections, then
1510 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1511 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h))
1512 {
1513 h->non_got_ref = 0;
1514 return true;
1515 }
1516
1517 /* We must allocate the symbol in our .dynbss section, which will
1518 become part of the .bss section of the executable. There will be
1519 an entry for this symbol in the .dynsym section. The dynamic
1520 object will contain position independent code, so all references
1521 from the dynamic object to this symbol will go through the global
1522 offset table. The dynamic linker will use the .dynsym entry to
1523 determine the address it must put in the global offset table, so
1524 both the dynamic object and the regular object will refer to the
1525 same memory location for the variable. */
1526
1527 htab = elf_s390_hash_table (info);
1528
1529 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1530 copy the initial value out of the dynamic object and into the
1531 runtime process image. */
1532 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1533 {
1534 s = htab->elf.sdynrelro;
1535 srel = htab->elf.sreldynrelro;
1536 }
1537 else
1538 {
1539 s = htab->elf.sdynbss;
1540 srel = htab->elf.srelbss;
1541 }
1542 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1543 {
1544 srel->size += sizeof (Elf32_External_Rela);
1545 h->needs_copy = 1;
1546 }
1547
1548 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1549 }
1550
1551 /* Allocate space in .plt, .got and associated reloc sections for
1552 dynamic relocs. */
1553
1554 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1555 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1556 {
1557 struct bfd_link_info *info;
1558 struct elf_s390_link_hash_table *htab;
1559 struct elf_dyn_relocs *p;
1560
1561 if (h->root.type == bfd_link_hash_indirect)
1562 return true;
1563
1564 info = (struct bfd_link_info *) inf;
1565 htab = elf_s390_hash_table (info);
1566
1567 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1568 here if it is defined and referenced in a non-shared object. */
1569 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1570 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1571 else if (htab->elf.dynamic_sections_created
1572 && h->plt.refcount > 0)
1573 {
1574 /* Make sure this symbol is output as a dynamic symbol.
1575 Undefined weak syms won't yet be marked as dynamic. */
1576 if (h->dynindx == -1
1577 && !h->forced_local)
1578 {
1579 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1580 return false;
1581 }
1582
1583 if (bfd_link_pic (info)
1584 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1585 {
1586 asection *s = htab->elf.splt;
1587
1588 /* If this is the first .plt entry, make room for the special
1589 first entry. */
1590 if (s->size == 0)
1591 s->size += PLT_FIRST_ENTRY_SIZE;
1592
1593 h->plt.offset = s->size;
1594
1595 /* If this symbol is not defined in a regular file, and we are
1596 not generating a shared library, then set the symbol to this
1597 location in the .plt. This is required to make function
1598 pointers compare as equal between the normal executable and
1599 the shared library. */
1600 if (! bfd_link_pic (info)
1601 && !h->def_regular)
1602 {
1603 h->root.u.def.section = s;
1604 h->root.u.def.value = h->plt.offset;
1605 }
1606
1607 /* Make room for this entry. */
1608 s->size += PLT_ENTRY_SIZE;
1609
1610 /* We also need to make an entry in the .got.plt section, which
1611 will be placed in the .got section by the linker script. */
1612 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1613
1614 /* We also need to make an entry in the .rela.plt section. */
1615 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1616 }
1617 else
1618 {
1619 h->plt.offset = (bfd_vma) -1;
1620 h->needs_plt = 0;
1621 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1622 }
1623 }
1624 else
1625 {
1626 h->plt.offset = (bfd_vma) -1;
1627 h->needs_plt = 0;
1628 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1629 }
1630
1631 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1632 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1633 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1634 we can save the dynamic TLS relocation. */
1635 if (h->got.refcount > 0
1636 && !bfd_link_pic (info)
1637 && h->dynindx == -1
1638 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1639 {
1640 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1641 /* For the GOTIE access without a literal pool entry the offset has
1642 to be stored somewhere. The immediate value in the instruction
1643 is not bit enough so the value is stored in the got. */
1644 {
1645 h->got.offset = htab->elf.sgot->size;
1646 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1647 }
1648 else
1649 h->got.offset = (bfd_vma) -1;
1650 }
1651 else if (h->got.refcount > 0)
1652 {
1653 asection *s;
1654 bool dyn;
1655 int tls_type = elf_s390_hash_entry(h)->tls_type;
1656
1657 /* Make sure this symbol is output as a dynamic symbol.
1658 Undefined weak syms won't yet be marked as dynamic. */
1659 if (h->dynindx == -1
1660 && !h->forced_local)
1661 {
1662 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1663 return false;
1664 }
1665
1666 s = htab->elf.sgot;
1667 h->got.offset = s->size;
1668 s->size += GOT_ENTRY_SIZE;
1669 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1670 if (tls_type == GOT_TLS_GD)
1671 s->size += GOT_ENTRY_SIZE;
1672 dyn = htab->elf.dynamic_sections_created;
1673 /* R_390_TLS_IE32 needs one dynamic relocation,
1674 R_390_TLS_GD32 needs one if local symbol and two if global. */
1675 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1676 || tls_type >= GOT_TLS_IE)
1677 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1678 else if (tls_type == GOT_TLS_GD)
1679 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1680 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1681 || h->root.type != bfd_link_hash_undefweak)
1682 && (bfd_link_pic (info)
1683 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1684 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1685 }
1686 else
1687 h->got.offset = (bfd_vma) -1;
1688
1689 if (h->dyn_relocs == NULL)
1690 return true;
1691
1692 /* In the shared -Bsymbolic case, discard space allocated for
1693 dynamic pc-relative relocs against symbols which turn out to be
1694 defined in regular objects. For the normal shared case, discard
1695 space for pc-relative relocs that have become local due to symbol
1696 visibility changes. */
1697
1698 if (bfd_link_pic (info))
1699 {
1700 if (SYMBOL_CALLS_LOCAL (info, h))
1701 {
1702 struct elf_dyn_relocs **pp;
1703
1704 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1705 {
1706 p->count -= p->pc_count;
1707 p->pc_count = 0;
1708 if (p->count == 0)
1709 *pp = p->next;
1710 else
1711 pp = &p->next;
1712 }
1713 }
1714
1715 /* Also discard relocs on undefined weak syms with non-default
1716 visibility. */
1717 if (h->dyn_relocs != NULL
1718 && h->root.type == bfd_link_hash_undefweak)
1719 {
1720 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1721 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1722 h->dyn_relocs = NULL;
1723
1724 /* Make sure undefined weak symbols are output as a dynamic
1725 symbol in PIEs. */
1726 else if (h->dynindx == -1
1727 && !h->forced_local)
1728 {
1729 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1730 return false;
1731 }
1732 }
1733 }
1734 else if (ELIMINATE_COPY_RELOCS)
1735 {
1736 /* For the non-shared case, discard space for relocs against
1737 symbols which turn out to need copy relocs or are not
1738 dynamic. */
1739
1740 if (!h->non_got_ref
1741 && ((h->def_dynamic
1742 && !h->def_regular)
1743 || (htab->elf.dynamic_sections_created
1744 && (h->root.type == bfd_link_hash_undefweak
1745 || h->root.type == bfd_link_hash_undefined))))
1746 {
1747 /* Make sure this symbol is output as a dynamic symbol.
1748 Undefined weak syms won't yet be marked as dynamic. */
1749 if (h->dynindx == -1
1750 && !h->forced_local)
1751 {
1752 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1753 return false;
1754 }
1755
1756 /* If that succeeded, we know we'll be keeping all the
1757 relocs. */
1758 if (h->dynindx != -1)
1759 goto keep;
1760 }
1761
1762 h->dyn_relocs = NULL;
1763
1764 keep: ;
1765 }
1766
1767 /* Finally, allocate space. */
1768 for (p = h->dyn_relocs; p != NULL; p = p->next)
1769 {
1770 asection *sreloc = elf_section_data (p->sec)->sreloc;
1771
1772 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1773 }
1774
1775 return true;
1776 }
1777
1778 /* Set the sizes of the dynamic sections. */
1779
1780 static bool
elf_s390_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)1781 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1782 struct bfd_link_info *info)
1783 {
1784 struct elf_s390_link_hash_table *htab;
1785 bfd *dynobj;
1786 asection *s;
1787 bool relocs;
1788 bfd *ibfd;
1789
1790 htab = elf_s390_hash_table (info);
1791 dynobj = htab->elf.dynobj;
1792 if (dynobj == NULL)
1793 abort ();
1794
1795 if (htab->elf.dynamic_sections_created)
1796 {
1797 /* Set the contents of the .interp section to the interpreter. */
1798 if (bfd_link_executable (info) && !info->nointerp)
1799 {
1800 s = bfd_get_linker_section (dynobj, ".interp");
1801 if (s == NULL)
1802 abort ();
1803 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1804 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1805 }
1806 }
1807
1808 /* Set up .got offsets for local syms, and space for local dynamic
1809 relocs. */
1810 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1811 {
1812 bfd_signed_vma *local_got;
1813 bfd_signed_vma *end_local_got;
1814 char *local_tls_type;
1815 bfd_size_type locsymcount;
1816 Elf_Internal_Shdr *symtab_hdr;
1817 asection *srela;
1818 struct plt_entry *local_plt;
1819 unsigned int i;
1820
1821 if (! is_s390_elf (ibfd))
1822 continue;
1823
1824 for (s = ibfd->sections; s != NULL; s = s->next)
1825 {
1826 struct elf_dyn_relocs *p;
1827
1828 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1829 {
1830 if (!bfd_is_abs_section (p->sec)
1831 && bfd_is_abs_section (p->sec->output_section))
1832 {
1833 /* Input section has been discarded, either because
1834 it is a copy of a linkonce section or due to
1835 linker script /DISCARD/, so we'll be discarding
1836 the relocs too. */
1837 }
1838 else if (p->count != 0)
1839 {
1840 srela = elf_section_data (p->sec)->sreloc;
1841 srela->size += p->count * sizeof (Elf32_External_Rela);
1842 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1843 info->flags |= DF_TEXTREL;
1844 }
1845 }
1846 }
1847
1848 local_got = elf_local_got_refcounts (ibfd);
1849 if (!local_got)
1850 continue;
1851
1852 symtab_hdr = &elf_symtab_hdr (ibfd);
1853 locsymcount = symtab_hdr->sh_info;
1854 end_local_got = local_got + locsymcount;
1855 local_tls_type = elf_s390_local_got_tls_type (ibfd);
1856 s = htab->elf.sgot;
1857 srela = htab->elf.srelgot;
1858 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1859 {
1860 if (*local_got > 0)
1861 {
1862 *local_got = s->size;
1863 s->size += GOT_ENTRY_SIZE;
1864 if (*local_tls_type == GOT_TLS_GD)
1865 s->size += GOT_ENTRY_SIZE;
1866 if (bfd_link_pic (info))
1867 srela->size += sizeof (Elf32_External_Rela);
1868 }
1869 else
1870 *local_got = (bfd_vma) -1;
1871 }
1872 local_plt = elf_s390_local_plt (ibfd);
1873 for (i = 0; i < symtab_hdr->sh_info; i++)
1874 {
1875 if (local_plt[i].plt.refcount > 0)
1876 {
1877 local_plt[i].plt.offset = htab->elf.iplt->size;
1878 htab->elf.iplt->size += PLT_ENTRY_SIZE;
1879 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
1880 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
1881 }
1882 else
1883 local_plt[i].plt.offset = (bfd_vma) -1;
1884 }
1885 }
1886
1887 if (htab->tls_ldm_got.refcount > 0)
1888 {
1889 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
1890 relocs. */
1891 htab->tls_ldm_got.offset = htab->elf.sgot->size;
1892 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
1893 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1894 }
1895 else
1896 htab->tls_ldm_got.offset = -1;
1897
1898 /* Allocate global sym .plt and .got entries, and space for global
1899 sym dynamic relocs. */
1900 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
1901
1902 /* We now have determined the sizes of the various dynamic sections.
1903 Allocate memory for them. */
1904 relocs = false;
1905 for (s = dynobj->sections; s != NULL; s = s->next)
1906 {
1907 if ((s->flags & SEC_LINKER_CREATED) == 0)
1908 continue;
1909
1910 if (s == htab->elf.splt
1911 || s == htab->elf.sgot
1912 || s == htab->elf.sgotplt
1913 || s == htab->elf.sdynbss
1914 || s == htab->elf.sdynrelro
1915 || s == htab->elf.iplt
1916 || s == htab->elf.igotplt
1917 || s == htab->irelifunc)
1918 {
1919 /* Strip this section if we don't need it; see the
1920 comment below. */
1921 }
1922 else if (startswith (bfd_section_name (s), ".rela"))
1923 {
1924 if (s->size != 0)
1925 relocs = true;
1926
1927 /* We use the reloc_count field as a counter if we need
1928 to copy relocs into the output file. */
1929 s->reloc_count = 0;
1930 }
1931 else
1932 {
1933 /* It's not one of our sections, so don't allocate space. */
1934 continue;
1935 }
1936
1937 if (s->size == 0)
1938 {
1939 /* If we don't need this section, strip it from the
1940 output file. This is to handle .rela.bss and
1941 .rela.plt. We must create it in
1942 create_dynamic_sections, because it must be created
1943 before the linker maps input sections to output
1944 sections. The linker does that before
1945 adjust_dynamic_symbol is called, and it is that
1946 function which decides whether anything needs to go
1947 into these sections. */
1948
1949 s->flags |= SEC_EXCLUDE;
1950 continue;
1951 }
1952
1953 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1954 continue;
1955
1956 /* Allocate memory for the section contents. We use bfd_zalloc
1957 here in case unused entries are not reclaimed before the
1958 section's contents are written out. This should not happen,
1959 but this way if it does, we get a R_390_NONE reloc instead
1960 of garbage. */
1961 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1962 if (s->contents == NULL)
1963 return false;
1964 }
1965
1966 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1967 }
1968
1969 /* Return the base VMA address which should be subtracted from real addresses
1970 when resolving @dtpoff relocation.
1971 This is PT_TLS segment p_vaddr. */
1972
1973 static bfd_vma
dtpoff_base(struct bfd_link_info * info)1974 dtpoff_base (struct bfd_link_info *info)
1975 {
1976 /* If tls_sec is NULL, we should have signalled an error already. */
1977 if (elf_hash_table (info)->tls_sec == NULL)
1978 return 0;
1979 return elf_hash_table (info)->tls_sec->vma;
1980 }
1981
1982 /* Return the relocation value for @tpoff relocation
1983 if STT_TLS virtual address is ADDRESS. */
1984
1985 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)1986 tpoff (struct bfd_link_info *info, bfd_vma address)
1987 {
1988 struct elf_link_hash_table *htab = elf_hash_table (info);
1989
1990 /* If tls_sec is NULL, we should have signalled an error already. */
1991 if (htab->tls_sec == NULL)
1992 return 0;
1993 return htab->tls_size + htab->tls_sec->vma - address;
1994 }
1995
1996 /* Complain if TLS instruction relocation is against an invalid
1997 instruction. */
1998
1999 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)2000 invalid_tls_insn (bfd *input_bfd,
2001 asection *input_section,
2002 Elf_Internal_Rela *rel)
2003 {
2004 reloc_howto_type *howto;
2005
2006 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2007 _bfd_error_handler
2008 /* xgettext:c-format */
2009 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
2010 input_bfd,
2011 input_section,
2012 (uint64_t) rel->r_offset,
2013 howto->name);
2014 bfd_set_error (bfd_error_bad_value);
2015 }
2016
2017 /* Relocate a 390 ELF section. */
2018
2019 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)2020 elf_s390_relocate_section (bfd *output_bfd,
2021 struct bfd_link_info *info,
2022 bfd *input_bfd,
2023 asection *input_section,
2024 bfd_byte *contents,
2025 Elf_Internal_Rela *relocs,
2026 Elf_Internal_Sym *local_syms,
2027 asection **local_sections)
2028 {
2029 struct elf_s390_link_hash_table *htab;
2030 Elf_Internal_Shdr *symtab_hdr;
2031 struct elf_link_hash_entry **sym_hashes;
2032 bfd_vma *local_got_offsets;
2033 Elf_Internal_Rela *rel;
2034 Elf_Internal_Rela *relend;
2035
2036 if (!is_s390_elf (input_bfd))
2037 {
2038 bfd_set_error (bfd_error_wrong_format);
2039 return false;
2040 }
2041
2042 htab = elf_s390_hash_table (info);
2043 symtab_hdr = &elf_symtab_hdr (input_bfd);
2044 sym_hashes = elf_sym_hashes (input_bfd);
2045 local_got_offsets = elf_local_got_offsets (input_bfd);
2046
2047 rel = relocs;
2048 relend = relocs + input_section->reloc_count;
2049 for (; rel < relend; rel++)
2050 {
2051 unsigned int r_type;
2052 reloc_howto_type *howto;
2053 unsigned long r_symndx;
2054 struct elf_link_hash_entry *h;
2055 Elf_Internal_Sym *sym;
2056 asection *sec;
2057 bfd_vma off;
2058 bfd_vma relocation;
2059 bool unresolved_reloc;
2060 bfd_reloc_status_type r;
2061 int tls_type;
2062 asection *base_got = htab->elf.sgot;
2063 bool resolved_to_zero;
2064
2065 r_type = ELF32_R_TYPE (rel->r_info);
2066 if (r_type == (int) R_390_GNU_VTINHERIT
2067 || r_type == (int) R_390_GNU_VTENTRY)
2068 continue;
2069 if (r_type >= (int) R_390_max)
2070 {
2071 bfd_set_error (bfd_error_bad_value);
2072 return false;
2073 }
2074
2075 howto = elf_howto_table + r_type;
2076 r_symndx = ELF32_R_SYM (rel->r_info);
2077
2078 h = NULL;
2079 sym = NULL;
2080 sec = NULL;
2081 unresolved_reloc = false;
2082 if (r_symndx < symtab_hdr->sh_info)
2083 {
2084 sym = local_syms + r_symndx;
2085 sec = local_sections[r_symndx];
2086 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2087 {
2088 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2089 if (local_plt == NULL)
2090 return false;
2091
2092 /* Address of the PLT slot. */
2093 relocation = (htab->elf.iplt->output_section->vma
2094 + htab->elf.iplt->output_offset
2095 + local_plt[r_symndx].plt.offset);
2096
2097 switch (r_type)
2098 {
2099 case R_390_PLTOFF16:
2100 case R_390_PLTOFF32:
2101 relocation -= htab->elf.sgot->output_section->vma;
2102 break;
2103 case R_390_GOTPLT12:
2104 case R_390_GOTPLT16:
2105 case R_390_GOTPLT20:
2106 case R_390_GOTPLT32:
2107 case R_390_GOTPLTENT:
2108 case R_390_GOT12:
2109 case R_390_GOT16:
2110 case R_390_GOT20:
2111 case R_390_GOT32:
2112 case R_390_GOTENT:
2113 {
2114 /* Write the PLT slot address into the GOT slot. */
2115 bfd_put_32 (output_bfd, relocation,
2116 htab->elf.sgot->contents +
2117 local_got_offsets[r_symndx]);
2118 relocation = (local_got_offsets[r_symndx] +
2119 htab->elf.sgot->output_offset);
2120
2121 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2122 relocation += htab->elf.sgot->output_section->vma;
2123 break;
2124 }
2125 default:
2126 break;
2127 }
2128 /* The output section is needed later in
2129 finish_dynamic_section when creating the dynamic
2130 relocation. */
2131 local_plt[r_symndx].sec = sec;
2132 goto do_relocation;
2133 }
2134 else
2135 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2136 }
2137 else
2138 {
2139 bool warned ATTRIBUTE_UNUSED;
2140 bool ignored ATTRIBUTE_UNUSED;
2141
2142 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2143 r_symndx, symtab_hdr, sym_hashes,
2144 h, sec, relocation,
2145 unresolved_reloc, warned, ignored);
2146 }
2147
2148 if (sec != NULL && discarded_section (sec))
2149 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2150 rel, 1, relend, howto, 0, contents);
2151
2152 if (bfd_link_relocatable (info))
2153 continue;
2154
2155 resolved_to_zero = (h != NULL
2156 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
2157
2158 switch (r_type)
2159 {
2160 case R_390_GOTPLT12:
2161 case R_390_GOTPLT16:
2162 case R_390_GOTPLT20:
2163 case R_390_GOTPLT32:
2164 case R_390_GOTPLTENT:
2165 /* There are three cases for a GOTPLT relocation. 1) The
2166 relocation is against the jump slot entry of a plt that
2167 will get emitted to the output file. 2) The relocation
2168 is against the jump slot of a plt entry that has been
2169 removed. elf_s390_adjust_gotplt has created a GOT entry
2170 as replacement. 3) The relocation is against a local symbol.
2171 Cases 2) and 3) are the same as the GOT relocation code
2172 so we just have to test for case 1 and fall through for
2173 the other two. */
2174 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2175 {
2176 bfd_vma plt_index;
2177
2178 if (s390_is_ifunc_symbol_p (h))
2179 {
2180 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2181 relocation = (plt_index * GOT_ENTRY_SIZE +
2182 htab->elf.igotplt->output_offset);
2183 if (r_type == R_390_GOTPLTENT)
2184 relocation += htab->elf.igotplt->output_section->vma;
2185 }
2186 else
2187 {
2188 /* Calc. index no.
2189 Current offset - size first entry / entry size. */
2190 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2191 PLT_ENTRY_SIZE;
2192
2193 /* Offset in GOT is PLT index plus GOT headers(3)
2194 times 4, addr & GOT addr. */
2195 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2196 if (r_type == R_390_GOTPLTENT)
2197 relocation += htab->elf.sgot->output_section->vma;
2198 }
2199 unresolved_reloc = false;
2200
2201 }
2202 /* Fall through. */
2203
2204 case R_390_GOT12:
2205 case R_390_GOT16:
2206 case R_390_GOT20:
2207 case R_390_GOT32:
2208 case R_390_GOTENT:
2209 /* Relocation is to the entry for this symbol in the global
2210 offset table. */
2211 if (base_got == NULL)
2212 abort ();
2213
2214 if (h != NULL)
2215 {
2216 bool dyn;
2217
2218 off = h->got.offset;
2219 dyn = htab->elf.dynamic_sections_created;
2220
2221 if (s390_is_ifunc_symbol_p (h))
2222 {
2223 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2224 if (off == (bfd_vma)-1)
2225 {
2226 /* No explicit GOT usage so redirect to the
2227 got.iplt slot. */
2228 base_got = htab->elf.igotplt;
2229 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2230 }
2231 else
2232 {
2233 /* Explicit GOT slots must contain the address
2234 of the PLT slot. This will be handled in
2235 finish_dynamic_symbol. */
2236 }
2237 }
2238 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2239 bfd_link_pic (info),
2240 h)
2241 || (bfd_link_pic (info)
2242 && SYMBOL_REFERENCES_LOCAL (info, h))
2243 || (ELF_ST_VISIBILITY (h->other)
2244 && h->root.type == bfd_link_hash_undefweak))
2245
2246 {
2247 /* This is actually a static link, or it is a
2248 -Bsymbolic link and the symbol is defined
2249 locally, or the symbol was forced to be local
2250 because of a version file. We must initialize
2251 this entry in the global offset table. Since the
2252 offset must always be a multiple of 2, we use the
2253 least significant bit to record whether we have
2254 initialized it already.
2255
2256 When doing a dynamic link, we create a .rel.got
2257 relocation entry to initialize the value. This
2258 is done in the finish_dynamic_symbol routine. */
2259 if ((off & 1) != 0)
2260 off &= ~1;
2261 else
2262 {
2263 bfd_put_32 (output_bfd, relocation,
2264 base_got->contents + off);
2265 h->got.offset |= 1;
2266 }
2267
2268 if ((h->def_regular
2269 && bfd_link_pic (info)
2270 && SYMBOL_REFERENCES_LOCAL (info, h))
2271 /* lrl rx,sym@GOTENT -> larl rx, sym */
2272 && ((r_type == R_390_GOTENT
2273 && (bfd_get_16 (input_bfd,
2274 contents + rel->r_offset - 2)
2275 & 0xff0f) == 0xc40d)
2276 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2277 || (r_type == R_390_GOT20
2278 && (bfd_get_32 (input_bfd,
2279 contents + rel->r_offset - 2)
2280 & 0xff00f000) == 0xe300c000
2281 && bfd_get_8 (input_bfd,
2282 contents + rel->r_offset + 3) == 0x58)))
2283 {
2284 unsigned short new_insn =
2285 (0xc000 | (bfd_get_8 (input_bfd,
2286 contents + rel->r_offset - 1) & 0xf0));
2287 bfd_put_16 (output_bfd, new_insn,
2288 contents + rel->r_offset - 2);
2289 r_type = R_390_PC32DBL;
2290 rel->r_addend = 2;
2291 howto = elf_howto_table + r_type;
2292 relocation = h->root.u.def.value
2293 + h->root.u.def.section->output_section->vma
2294 + h->root.u.def.section->output_offset;
2295 goto do_relocation;
2296 }
2297 }
2298 else
2299 unresolved_reloc = false;
2300 }
2301 else
2302 {
2303 if (local_got_offsets == NULL)
2304 abort ();
2305
2306 off = local_got_offsets[r_symndx];
2307
2308 /* The offset must always be a multiple of 4. We use
2309 the least significant bit to record whether we have
2310 already generated the necessary reloc. */
2311 if ((off & 1) != 0)
2312 off &= ~1;
2313 else
2314 {
2315 bfd_put_32 (output_bfd, relocation,
2316 htab->elf.sgot->contents + off);
2317
2318 if (bfd_link_pic (info))
2319 {
2320 asection *srelgot;
2321 Elf_Internal_Rela outrel;
2322 bfd_byte *loc;
2323
2324 srelgot = htab->elf.srelgot;
2325 if (srelgot == NULL)
2326 abort ();
2327
2328 outrel.r_offset = (htab->elf.sgot->output_section->vma
2329 + htab->elf.sgot->output_offset
2330 + off);
2331 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2332 outrel.r_addend = relocation;
2333 loc = srelgot->contents;
2334 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2335 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2336 }
2337
2338 local_got_offsets[r_symndx] |= 1;
2339 }
2340 }
2341
2342 if (off >= (bfd_vma) -2)
2343 abort ();
2344
2345 relocation = base_got->output_offset + off;
2346
2347 /* For @GOTENT the relocation is against the offset between
2348 the instruction and the symbols entry in the GOT and not
2349 between the start of the GOT and the symbols entry. We
2350 add the vma of the GOT to get the correct value. */
2351 if ( r_type == R_390_GOTENT
2352 || r_type == R_390_GOTPLTENT)
2353 relocation += base_got->output_section->vma;
2354
2355 break;
2356
2357 case R_390_GOTOFF16:
2358 case R_390_GOTOFF32:
2359 /* Relocation is relative to the start of the global offset
2360 table. */
2361
2362 if (h != NULL
2363 && s390_is_ifunc_symbol_p (h)
2364 && h->def_regular
2365 && !bfd_link_executable (info))
2366 {
2367 relocation = (htab->elf.iplt->output_section->vma
2368 + htab->elf.iplt->output_offset
2369 + h->plt.offset
2370 - htab->elf.sgot->output_section->vma);
2371 goto do_relocation;
2372 }
2373
2374 /* Note that sgot->output_offset is not involved in this
2375 calculation. We always want the start of .got. If we
2376 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2377 permitted by the ABI, we might have to change this
2378 calculation. */
2379 relocation -= htab->elf.sgot->output_section->vma;
2380 break;
2381
2382 case R_390_GOTPC:
2383 case R_390_GOTPCDBL:
2384 /* Use global offset table as symbol value. */
2385 relocation = htab->elf.sgot->output_section->vma;
2386 unresolved_reloc = false;
2387 break;
2388
2389 case R_390_PLT12DBL:
2390 case R_390_PLT16DBL:
2391 case R_390_PLT24DBL:
2392 case R_390_PLT32DBL:
2393 case R_390_PLT32:
2394 /* Relocation is to the entry for this symbol in the
2395 procedure linkage table. */
2396
2397 /* Resolve a PLT32 reloc against a local symbol directly,
2398 without using the procedure linkage table. */
2399 if (h == NULL)
2400 break;
2401
2402 if (h->plt.offset == (bfd_vma) -1
2403 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2404 {
2405 /* We didn't make a PLT entry for this symbol. This
2406 happens when statically linking PIC code, or when
2407 using -Bsymbolic. */
2408 break;
2409 }
2410
2411 if (s390_is_ifunc_symbol_p (h))
2412 relocation = (htab->elf.iplt->output_section->vma
2413 + htab->elf.iplt->output_offset
2414 + h->plt.offset);
2415 else
2416 relocation = (htab->elf.splt->output_section->vma
2417 + htab->elf.splt->output_offset
2418 + h->plt.offset);
2419 unresolved_reloc = false;
2420 break;
2421
2422 case R_390_PLTOFF16:
2423 case R_390_PLTOFF32:
2424 /* Relocation is to the entry for this symbol in the
2425 procedure linkage table relative to the start of the GOT. */
2426
2427 /* For local symbols or if we didn't make a PLT entry for
2428 this symbol resolve the symbol directly. */
2429 if (h == NULL
2430 || h->plt.offset == (bfd_vma) -1
2431 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2432 {
2433 relocation -= htab->elf.sgot->output_section->vma;
2434 break;
2435 }
2436
2437 if (s390_is_ifunc_symbol_p (h))
2438 relocation = (htab->elf.iplt->output_section->vma
2439 + htab->elf.iplt->output_offset
2440 + h->plt.offset
2441 - htab->elf.sgot->output_section->vma);
2442 else
2443 relocation = (htab->elf.splt->output_section->vma
2444 + htab->elf.splt->output_offset
2445 + h->plt.offset
2446 - htab->elf.sgot->output_section->vma);
2447 unresolved_reloc = false;
2448 break;
2449
2450 case R_390_PC16:
2451 case R_390_PC12DBL:
2452 case R_390_PC16DBL:
2453 case R_390_PC24DBL:
2454 case R_390_PC32DBL:
2455 case R_390_PC32:
2456 if (h != NULL
2457 && s390_is_ifunc_symbol_p (h)
2458 && h->def_regular
2459 && !bfd_link_executable (info))
2460 {
2461 /* This will not work our if the function does not
2462 happen to set up the GOT pointer for some other
2463 reason. 31 bit PLT entries require r12 to hold the
2464 GOT pointer.
2465 FIXME: Implement an errorcheck.
2466 NOTE: It will work when brasl is not available
2467 (e.g. with -m31 -march=g5) since a local function
2468 call then does use GOTOFF which implies r12 being set
2469 up. */
2470 relocation = (htab->elf.iplt->output_section->vma
2471 + htab->elf.iplt->output_offset
2472 + h ->plt.offset);
2473 goto do_relocation;
2474 }
2475 /* Fall through. */
2476
2477 case R_390_8:
2478 case R_390_16:
2479 case R_390_32:
2480 if ((input_section->flags & SEC_ALLOC) == 0)
2481 break;
2482
2483 if (h != NULL
2484 && s390_is_ifunc_symbol_p (h)
2485 && h->def_regular)
2486 {
2487 if (!bfd_link_pic (info))
2488 {
2489 /* For a non-shared object STT_GNU_IFUNC symbol must
2490 go through PLT. */
2491 relocation = (htab->elf.iplt->output_section->vma
2492 + htab->elf.iplt->output_offset
2493 + h ->plt.offset);
2494 goto do_relocation;
2495 }
2496 else
2497 {
2498 /* For shared objects a runtime relocation is needed. */
2499
2500 Elf_Internal_Rela outrel;
2501 asection *sreloc;
2502
2503 /* Need a dynamic relocation to get the real function
2504 address. */
2505 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2506 info,
2507 input_section,
2508 rel->r_offset);
2509 if (outrel.r_offset == (bfd_vma) -1
2510 || outrel.r_offset == (bfd_vma) -2)
2511 abort ();
2512
2513 outrel.r_offset += (input_section->output_section->vma
2514 + input_section->output_offset);
2515
2516 if (h->dynindx == -1
2517 || h->forced_local
2518 || bfd_link_executable (info))
2519 {
2520 /* This symbol is resolved locally. */
2521 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2522 outrel.r_addend = (h->root.u.def.value
2523 + h->root.u.def.section->output_section->vma
2524 + h->root.u.def.section->output_offset);
2525 }
2526 else
2527 {
2528 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2529 outrel.r_addend = 0;
2530 }
2531
2532 sreloc = htab->elf.irelifunc;
2533 elf_append_rela (output_bfd, sreloc, &outrel);
2534
2535 /* If this reloc is against an external symbol, we
2536 do not want to fiddle with the addend. Otherwise,
2537 we need to include the symbol value so that it
2538 becomes an addend for the dynamic reloc. For an
2539 internal symbol, we have updated addend. */
2540 continue;
2541 }
2542 }
2543
2544 if ((bfd_link_pic (info)
2545 && (h == NULL
2546 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2547 && !resolved_to_zero)
2548 || h->root.type != bfd_link_hash_undefweak)
2549 && ((r_type != R_390_PC16
2550 && r_type != R_390_PC12DBL
2551 && r_type != R_390_PC16DBL
2552 && r_type != R_390_PC24DBL
2553 && r_type != R_390_PC32DBL
2554 && r_type != R_390_PC32)
2555 || !SYMBOL_CALLS_LOCAL (info, h)))
2556 || (ELIMINATE_COPY_RELOCS
2557 && !bfd_link_pic (info)
2558 && h != NULL
2559 && h->dynindx != -1
2560 && !h->non_got_ref
2561 && ((h->def_dynamic
2562 && !h->def_regular)
2563 || h->root.type == bfd_link_hash_undefweak
2564 || h->root.type == bfd_link_hash_undefined)))
2565 {
2566 Elf_Internal_Rela outrel;
2567 bool skip, relocate;
2568 asection *sreloc;
2569 bfd_byte *loc;
2570
2571 /* When generating a shared object, these relocations
2572 are copied into the output file to be resolved at run
2573 time. */
2574
2575 skip = false;
2576 relocate = false;
2577
2578 outrel.r_offset =
2579 _bfd_elf_section_offset (output_bfd, info, input_section,
2580 rel->r_offset);
2581 if (outrel.r_offset == (bfd_vma) -1)
2582 skip = true;
2583 else if (outrel.r_offset == (bfd_vma) -2)
2584 skip = true, relocate = true;
2585 outrel.r_offset += (input_section->output_section->vma
2586 + input_section->output_offset);
2587
2588 if (skip)
2589 memset (&outrel, 0, sizeof outrel);
2590 else if (h != NULL
2591 && h->dynindx != -1
2592 && (r_type == R_390_PC16
2593 || r_type == R_390_PC12DBL
2594 || r_type == R_390_PC16DBL
2595 || r_type == R_390_PC24DBL
2596 || r_type == R_390_PC32DBL
2597 || r_type == R_390_PC32
2598 || !bfd_link_pic (info)
2599 || !SYMBOLIC_BIND (info, h)
2600 || !h->def_regular))
2601 {
2602 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2603 outrel.r_addend = rel->r_addend;
2604 }
2605 else
2606 {
2607 /* This symbol is local, or marked to become local. */
2608 outrel.r_addend = relocation + rel->r_addend;
2609 if (r_type == R_390_32)
2610 {
2611 relocate = true;
2612 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2613 }
2614 else
2615 {
2616 long sindx;
2617
2618 if (bfd_is_abs_section (sec))
2619 sindx = 0;
2620 else if (sec == NULL || sec->owner == NULL)
2621 {
2622 bfd_set_error(bfd_error_bad_value);
2623 return false;
2624 }
2625 else
2626 {
2627 asection *osec;
2628
2629 osec = sec->output_section;
2630 sindx = elf_section_data (osec)->dynindx;
2631 if (sindx == 0)
2632 {
2633 osec = htab->elf.text_index_section;
2634 sindx = elf_section_data (osec)->dynindx;
2635 }
2636 BFD_ASSERT (sindx != 0);
2637
2638 /* We are turning this relocation into one
2639 against a section symbol, so subtract out
2640 the output section's address but not the
2641 offset of the input section in the output
2642 section. */
2643 outrel.r_addend -= osec->vma;
2644 }
2645 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2646 }
2647 }
2648
2649 sreloc = elf_section_data (input_section)->sreloc;
2650 if (sreloc == NULL)
2651 abort ();
2652
2653 loc = sreloc->contents;
2654 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2655 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2656
2657 /* If this reloc is against an external symbol, we do
2658 not want to fiddle with the addend. Otherwise, we
2659 need to include the symbol value so that it becomes
2660 an addend for the dynamic reloc. */
2661 if (! relocate)
2662 continue;
2663 }
2664 break;
2665
2666 /* Relocations for tls literal pool entries. */
2667 case R_390_TLS_IE32:
2668 if (bfd_link_pic (info))
2669 {
2670 Elf_Internal_Rela outrel;
2671 asection *sreloc;
2672 bfd_byte *loc;
2673
2674 outrel.r_offset = rel->r_offset
2675 + input_section->output_section->vma
2676 + input_section->output_offset;
2677 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2678 sreloc = elf_section_data (input_section)->sreloc;
2679 if (sreloc == NULL)
2680 abort ();
2681 loc = sreloc->contents;
2682 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2683 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2684 }
2685 /* Fall through. */
2686
2687 case R_390_TLS_GD32:
2688 case R_390_TLS_GOTIE32:
2689 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2690 tls_type = GOT_UNKNOWN;
2691 if (h == NULL && local_got_offsets)
2692 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2693 else if (h != NULL)
2694 {
2695 tls_type = elf_s390_hash_entry(h)->tls_type;
2696 if (!bfd_link_pic (info)
2697 && h->dynindx == -1
2698 && tls_type >= GOT_TLS_IE)
2699 r_type = R_390_TLS_LE32;
2700 }
2701 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2702 r_type = R_390_TLS_IE32;
2703
2704 if (r_type == R_390_TLS_LE32)
2705 {
2706 /* This relocation gets optimized away by the local exec
2707 access optimization. */
2708 BFD_ASSERT (! unresolved_reloc);
2709 bfd_put_32 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2710 contents + rel->r_offset);
2711 continue;
2712 }
2713
2714 if (htab->elf.sgot == NULL)
2715 abort ();
2716
2717 if (h != NULL)
2718 off = h->got.offset;
2719 else
2720 {
2721 if (local_got_offsets == NULL)
2722 abort ();
2723
2724 off = local_got_offsets[r_symndx];
2725 }
2726
2727 emit_tls_relocs:
2728
2729 if ((off & 1) != 0)
2730 off &= ~1;
2731 else
2732 {
2733 Elf_Internal_Rela outrel;
2734 bfd_byte *loc;
2735 int dr_type, indx;
2736
2737 if (htab->elf.srelgot == NULL)
2738 abort ();
2739
2740 outrel.r_offset = (htab->elf.sgot->output_section->vma
2741 + htab->elf.sgot->output_offset + off);
2742
2743 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2744 if (r_type == R_390_TLS_GD32)
2745 dr_type = R_390_TLS_DTPMOD;
2746 else
2747 dr_type = R_390_TLS_TPOFF;
2748 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2749 outrel.r_addend = relocation - dtpoff_base (info);
2750 else
2751 outrel.r_addend = 0;
2752 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2753 loc = htab->elf.srelgot->contents;
2754 loc += htab->elf.srelgot->reloc_count++
2755 * sizeof (Elf32_External_Rela);
2756 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2757
2758 if (r_type == R_390_TLS_GD32)
2759 {
2760 if (indx == 0)
2761 {
2762 BFD_ASSERT (! unresolved_reloc);
2763 bfd_put_32 (output_bfd,
2764 relocation - dtpoff_base (info),
2765 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2766 }
2767 else
2768 {
2769 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2770 outrel.r_offset += GOT_ENTRY_SIZE;
2771 outrel.r_addend = 0;
2772 htab->elf.srelgot->reloc_count++;
2773 loc += sizeof (Elf32_External_Rela);
2774 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2775 }
2776 }
2777
2778 if (h != NULL)
2779 h->got.offset |= 1;
2780 else
2781 local_got_offsets[r_symndx] |= 1;
2782 }
2783
2784 if (off >= (bfd_vma) -2)
2785 abort ();
2786 if (r_type == ELF32_R_TYPE (rel->r_info))
2787 {
2788 relocation = htab->elf.sgot->output_offset + off;
2789 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2790 relocation += htab->elf.sgot->output_section->vma;
2791 unresolved_reloc = false;
2792 }
2793 else
2794 {
2795 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
2796 contents + rel->r_offset);
2797 continue;
2798 }
2799 break;
2800
2801 case R_390_TLS_GOTIE12:
2802 case R_390_TLS_GOTIE20:
2803 case R_390_TLS_IEENT:
2804 if (h == NULL)
2805 {
2806 if (local_got_offsets == NULL)
2807 abort();
2808 off = local_got_offsets[r_symndx];
2809 if (bfd_link_pic (info))
2810 goto emit_tls_relocs;
2811 }
2812 else
2813 {
2814 off = h->got.offset;
2815 tls_type = elf_s390_hash_entry(h)->tls_type;
2816 if (bfd_link_pic (info)
2817 || h->dynindx != -1
2818 || tls_type < GOT_TLS_IE)
2819 goto emit_tls_relocs;
2820 }
2821
2822 if (htab->elf.sgot == NULL)
2823 abort ();
2824
2825 BFD_ASSERT (! unresolved_reloc);
2826 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2827 htab->elf.sgot->contents + off);
2828 relocation = htab->elf.sgot->output_offset + off;
2829 if (r_type == R_390_TLS_IEENT)
2830 relocation += htab->elf.sgot->output_section->vma;
2831 unresolved_reloc = false;
2832 break;
2833
2834 case R_390_TLS_LDM32:
2835 if (! bfd_link_pic (info))
2836 /* The literal pool entry this relocation refers to gets ignored
2837 by the optimized code of the local exec model. Do nothing
2838 and the value will turn out zero. */
2839 continue;
2840
2841 if (htab->elf.sgot == NULL)
2842 abort ();
2843
2844 off = htab->tls_ldm_got.offset;
2845 if (off & 1)
2846 off &= ~1;
2847 else
2848 {
2849 Elf_Internal_Rela outrel;
2850 bfd_byte *loc;
2851
2852 if (htab->elf.srelgot == NULL)
2853 abort ();
2854
2855 outrel.r_offset = (htab->elf.sgot->output_section->vma
2856 + htab->elf.sgot->output_offset + off);
2857
2858 bfd_put_32 (output_bfd, 0,
2859 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2860 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2861 outrel.r_addend = 0;
2862 loc = htab->elf.srelgot->contents;
2863 loc += htab->elf.srelgot->reloc_count++
2864 * sizeof (Elf32_External_Rela);
2865 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2866 htab->tls_ldm_got.offset |= 1;
2867 }
2868 relocation = htab->elf.sgot->output_offset + off;
2869 unresolved_reloc = false;
2870 break;
2871
2872 case R_390_TLS_LE32:
2873 if (bfd_link_dll (info))
2874 {
2875 /* Linking a shared library with non-fpic code requires
2876 a R_390_TLS_TPOFF relocation. */
2877 Elf_Internal_Rela outrel;
2878 asection *sreloc;
2879 bfd_byte *loc;
2880 int indx;
2881
2882 outrel.r_offset = rel->r_offset
2883 + input_section->output_section->vma
2884 + input_section->output_offset;
2885 if (h != NULL && h->dynindx != -1)
2886 indx = h->dynindx;
2887 else
2888 indx = 0;
2889 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2890 if (indx == 0)
2891 outrel.r_addend = relocation - dtpoff_base (info);
2892 else
2893 outrel.r_addend = 0;
2894 sreloc = elf_section_data (input_section)->sreloc;
2895 if (sreloc == NULL)
2896 abort ();
2897 loc = sreloc->contents;
2898 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2899 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2900 }
2901 else
2902 {
2903 BFD_ASSERT (! unresolved_reloc);
2904 bfd_put_32 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2905 contents + rel->r_offset);
2906 }
2907 continue;
2908
2909 case R_390_TLS_LDO32:
2910 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
2911 relocation -= dtpoff_base (info);
2912 else
2913 /* When converting LDO to LE, we must negate. */
2914 relocation = -tpoff (info, relocation);
2915 break;
2916
2917 /* Relocations for tls instructions. */
2918 case R_390_TLS_LOAD:
2919 case R_390_TLS_GDCALL:
2920 case R_390_TLS_LDCALL:
2921 tls_type = GOT_UNKNOWN;
2922 if (h == NULL && local_got_offsets)
2923 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2924 else if (h != NULL)
2925 tls_type = elf_s390_hash_entry(h)->tls_type;
2926
2927 if (tls_type == GOT_TLS_GD)
2928 continue;
2929
2930 if (r_type == R_390_TLS_LOAD)
2931 {
2932 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
2933 {
2934 /* IE->LE transition. Four valid cases:
2935 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2936 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2937 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2938 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2939 unsigned int insn, ry;
2940
2941 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2942 if ((insn & 0xff00f000) == 0x58000000)
2943 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2944 ry = (insn & 0x000f0000);
2945 else if ((insn & 0xff0f0000) == 0x58000000)
2946 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2947 ry = (insn & 0x0000f000) << 4;
2948 else if ((insn & 0xff00f000) == 0x5800c000)
2949 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2950 ry = (insn & 0x000f0000);
2951 else if ((insn & 0xff0f0000) == 0x580c0000)
2952 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2953 ry = (insn & 0x0000f000) << 4;
2954 else
2955 {
2956 invalid_tls_insn (input_bfd, input_section, rel);
2957 return false;
2958 }
2959 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2960 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2961 }
2962 }
2963 else if (r_type == R_390_TLS_GDCALL)
2964 {
2965 unsigned int insn;
2966
2967 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2968 if ((insn & 0xff000fff) != 0x4d000000 &&
2969 (insn & 0xffff0000) != 0xc0e50000 &&
2970 (insn & 0xff000000) != 0x0d000000)
2971 {
2972 invalid_tls_insn (input_bfd, input_section, rel);
2973 return false;
2974 }
2975 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
2976 {
2977 if ((insn & 0xff000000) == 0x0d000000)
2978 {
2979 /* GD->LE transition.
2980 basr rx, ry -> nopr r7 */
2981 insn = 0x07070000 | (insn & 0xffff);
2982 }
2983 else if ((insn & 0xff000000) == 0x4d000000)
2984 {
2985 /* GD->LE transition.
2986 bas %r14,0(%rx,%r13) -> bc 0,0 */
2987 insn = 0x47000000;
2988 }
2989 else
2990 {
2991 /* GD->LE transition.
2992 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
2993 insn = 0xc0040000;
2994 bfd_put_16 (output_bfd, 0x0000,
2995 contents + rel->r_offset + 4);
2996 }
2997 }
2998 else
2999 {
3000 /* If basr is used in the pic case to invoke
3001 _tls_get_offset, something went wrong before. */
3002 if ((insn & 0xff000000) == 0x0d000000)
3003 {
3004 invalid_tls_insn (input_bfd, input_section, rel);
3005 return false;
3006 }
3007
3008 if ((insn & 0xff000000) == 0x4d000000)
3009 {
3010 /* GD->IE transition.
3011 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3012 insn = 0x5822c000;
3013 }
3014 else
3015 {
3016 /* GD->IE transition.
3017 brasl %r14,__tls_get_addr@plt ->
3018 l %r2,0(%r2,%r12) ; bcr 0,0 */
3019 insn = 0x5822c000;
3020 bfd_put_16 (output_bfd, 0x0700,
3021 contents + rel->r_offset + 4);
3022 }
3023 }
3024 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3025 }
3026 else if (r_type == R_390_TLS_LDCALL)
3027 {
3028 if (!bfd_link_pic (info))
3029 {
3030 unsigned int insn;
3031
3032 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3033 if ((insn & 0xff000fff) != 0x4d000000 &&
3034 (insn & 0xffff0000) != 0xc0e50000 &&
3035 (insn & 0xff000000) != 0x0d000000)
3036 {
3037 invalid_tls_insn (input_bfd, input_section, rel);
3038 return false;
3039 }
3040
3041 if ((insn & 0xff000000) == 0x0d000000)
3042 {
3043 /* LD->LE transition.
3044 basr rx, ry -> nopr r7 */
3045 insn = 0x07070000 | (insn & 0xffff);
3046 }
3047 else if ((insn & 0xff000000) == 0x4d000000)
3048 {
3049 /* LD->LE transition.
3050 bas %r14,0(%rx,%r13) -> bc 0,0 */
3051 insn = 0x47000000;
3052 }
3053 else
3054 {
3055 /* LD->LE transition.
3056 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3057 insn = 0xc0040000;
3058 bfd_put_16 (output_bfd, 0x0000,
3059 contents + rel->r_offset + 4);
3060 }
3061 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3062 }
3063 }
3064 continue;
3065
3066 default:
3067 break;
3068 }
3069
3070 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3071 because such sections are not SEC_ALLOC and thus ld.so will
3072 not process them. */
3073 if (unresolved_reloc
3074 && !((input_section->flags & SEC_DEBUGGING) != 0
3075 && h->def_dynamic)
3076 && _bfd_elf_section_offset (output_bfd, info, input_section,
3077 rel->r_offset) != (bfd_vma) -1)
3078 _bfd_error_handler
3079 /* xgettext:c-format */
3080 (_("%pB(%pA+%#" PRIx64 "): "
3081 "unresolvable %s relocation against symbol `%s'"),
3082 input_bfd,
3083 input_section,
3084 (uint64_t) rel->r_offset,
3085 howto->name,
3086 h->root.root.string);
3087
3088 do_relocation:
3089
3090 /* When applying a 24 bit reloc we need to start one byte
3091 earlier. Otherwise the 32 bit get/put bfd operations might
3092 access a byte after the actual section. */
3093 if (r_type == R_390_PC24DBL
3094 || r_type == R_390_PLT24DBL)
3095 rel->r_offset--;
3096
3097 if (r_type == R_390_20
3098 || r_type == R_390_GOT20
3099 || r_type == R_390_GOTPLT20
3100 || r_type == R_390_TLS_GOTIE20)
3101 {
3102 relocation += rel->r_addend;
3103 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3104 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3105 contents, rel->r_offset,
3106 relocation, 0);
3107 }
3108 else
3109 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3110 contents, rel->r_offset,
3111 relocation, rel->r_addend);
3112
3113 if (r != bfd_reloc_ok)
3114 {
3115 const char *name;
3116
3117 if (h != NULL)
3118 name = h->root.root.string;
3119 else
3120 {
3121 name = bfd_elf_string_from_elf_section (input_bfd,
3122 symtab_hdr->sh_link,
3123 sym->st_name);
3124 if (name == NULL)
3125 return false;
3126 if (*name == '\0')
3127 name = bfd_section_name (sec);
3128 }
3129
3130 if (r == bfd_reloc_overflow)
3131 (*info->callbacks->reloc_overflow)
3132 (info, (h ? &h->root : NULL), name, howto->name,
3133 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3134 else
3135 {
3136 _bfd_error_handler
3137 /* xgettext:c-format */
3138 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3139 input_bfd, input_section,
3140 (uint64_t) rel->r_offset, name, (int) r);
3141 return false;
3142 }
3143 }
3144 }
3145
3146 return true;
3147 }
3148
3149 /* Generate the PLT slots together with the dynamic relocations needed
3150 for IFUNC symbols. */
3151
3152 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)3153 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3154 struct bfd_link_info *info,
3155 struct elf_link_hash_entry *h,
3156 struct elf_s390_link_hash_table *htab,
3157 bfd_vma iplt_offset,
3158 bfd_vma resolver_address)
3159 {
3160 bfd_vma iplt_index;
3161 bfd_vma got_offset;
3162 bfd_vma igotiplt_offset;
3163 Elf_Internal_Rela rela;
3164 bfd_byte *loc;
3165 asection *plt, *gotplt, *relplt;
3166 bfd_vma relative_offset;
3167
3168 if (htab->elf.iplt == NULL
3169 || htab->elf.igotplt == NULL
3170 || htab->elf.irelplt == NULL)
3171 abort ();
3172
3173 gotplt = htab->elf.igotplt;
3174 relplt = htab->elf.irelplt;
3175
3176 /* Index of the PLT slot within iplt section. */
3177 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3178 plt = htab->elf.iplt;
3179 /* Offset into the igot.plt section. */
3180 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3181 /* Offset into the got section. */
3182 got_offset = igotiplt_offset + gotplt->output_offset;
3183
3184 /* S390 uses halfwords for relative branch calc! */
3185 relative_offset = - (plt->output_offset +
3186 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3187 /* If offset is > 32768, branch to a previous branch
3188 390 can only handle +-64 K jumps. */
3189 if ( -32768 > (int) relative_offset )
3190 relative_offset
3191 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3192
3193 /* Fill in the entry in the procedure linkage table. */
3194 if (!bfd_link_pic (info))
3195 {
3196 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3197 PLT_ENTRY_SIZE);
3198
3199 /* Adjust jump to the first plt entry. */
3200 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3201 plt->contents + iplt_offset + 20);
3202
3203 /* Push the GOT offset field. */
3204 bfd_put_32 (output_bfd,
3205 (gotplt->output_section->vma
3206 + got_offset),
3207 plt->contents + iplt_offset + 24);
3208 }
3209 else if (got_offset < 4096)
3210 {
3211 /* The GOT offset is small enough to be used directly as
3212 displacement. */
3213 memcpy (plt->contents + iplt_offset,
3214 elf_s390_plt_pic12_entry,
3215 PLT_ENTRY_SIZE);
3216
3217 /* Put in the GOT offset as displacement value. The 0xc000
3218 value comes from the first word of the plt entry. Look
3219 at the elf_s390_plt_pic16_entry content. */
3220 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3221 plt->contents + iplt_offset + 2);
3222
3223 /* Adjust the jump to the first plt entry. */
3224 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3225 plt->contents + iplt_offset + 20);
3226 }
3227 else if (got_offset < 32768)
3228 {
3229 /* The GOT offset is too big for a displacement but small
3230 enough to be a signed 16 bit immediate value as it can be
3231 used in an lhi instruction. */
3232 memcpy (plt->contents + iplt_offset,
3233 elf_s390_plt_pic16_entry,
3234 PLT_ENTRY_SIZE);
3235
3236 /* Put in the GOT offset for the lhi instruction. */
3237 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3238 plt->contents + iplt_offset + 2);
3239
3240 /* Adjust the jump to the first plt entry. */
3241 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3242 plt->contents + iplt_offset + 20);
3243 }
3244 else
3245 {
3246 memcpy (plt->contents + iplt_offset,
3247 elf_s390_plt_pic_entry,
3248 PLT_ENTRY_SIZE);
3249
3250 /* Adjust the jump to the first plt entry. */
3251 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3252 plt->contents + iplt_offset + 20);
3253
3254 /* Push the GOT offset field. */
3255 bfd_put_32 (output_bfd, got_offset,
3256 plt->contents + iplt_offset + 24);
3257 }
3258 /* Insert offset into reloc. table here. */
3259 bfd_put_32 (output_bfd, relplt->output_offset +
3260 iplt_index * RELA_ENTRY_SIZE,
3261 plt->contents + iplt_offset + 28);
3262
3263 /* Fill in the entry in the global offset table.
3264 Points to instruction after GOT offset. */
3265 bfd_put_32 (output_bfd,
3266 (plt->output_section->vma
3267 + plt->output_offset
3268 + iplt_offset
3269 + 12),
3270 gotplt->contents + igotiplt_offset);
3271
3272 /* Fill in the entry in the .rela.plt section. */
3273 rela.r_offset = gotplt->output_section->vma + got_offset;
3274
3275 if (!h
3276 || h->dynindx == -1
3277 || ((bfd_link_executable (info)
3278 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3279 && h->def_regular))
3280 {
3281 /* The symbol can be locally resolved. */
3282 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3283 rela.r_addend = resolver_address;
3284 }
3285 else
3286 {
3287 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3288 rela.r_addend = 0;
3289 }
3290
3291 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3292 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3293 }
3294
3295 /* Finish up dynamic symbol handling. We set the contents of various
3296 dynamic sections here. */
3297
3298 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)3299 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3300 struct bfd_link_info *info,
3301 struct elf_link_hash_entry *h,
3302 Elf_Internal_Sym *sym)
3303 {
3304 struct elf_s390_link_hash_table *htab;
3305 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3306
3307 htab = elf_s390_hash_table (info);
3308
3309 if (h->plt.offset != (bfd_vma) -1)
3310 {
3311 bfd_vma plt_index;
3312 bfd_vma got_offset;
3313 Elf_Internal_Rela rela;
3314 bfd_byte *loc;
3315 bfd_vma relative_offset;
3316
3317 /* This symbol has an entry in the procedure linkage table. Set
3318 it up. */
3319 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3320 {
3321 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3322 htab, h->plt.offset,
3323 eh->ifunc_resolver_address +
3324 eh->ifunc_resolver_section->output_offset +
3325 eh->ifunc_resolver_section->output_section->vma);
3326 /* Do not return yet. Handling of explicit GOT slots of
3327 IFUNC symbols is below. */
3328 }
3329 else
3330 {
3331 if (h->dynindx == -1
3332 || htab->elf.splt == NULL
3333 || htab->elf.sgotplt == NULL
3334 || htab->elf.srelplt == NULL)
3335 abort ();
3336
3337 /* Calc. index no.
3338 Current offset - size first entry / entry size. */
3339 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3340
3341 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3342 addr & GOT addr. */
3343 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3344
3345 /* S390 uses halfwords for relative branch calc! */
3346 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3347 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3348 /* If offset is > 32768, branch to a previous branch
3349 390 can only handle +-64 K jumps. */
3350 if ( -32768 > (int) relative_offset )
3351 relative_offset
3352 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3353
3354 /* Fill in the entry in the procedure linkage table. */
3355 if (!bfd_link_pic (info))
3356 {
3357 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3358 PLT_ENTRY_SIZE);
3359
3360 /* Adjust jump to the first plt entry. */
3361 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3362 htab->elf.splt->contents + h->plt.offset + 20);
3363
3364 /* Push the GOT offset field. */
3365 bfd_put_32 (output_bfd,
3366 (htab->elf.sgotplt->output_section->vma
3367 + htab->elf.sgotplt->output_offset
3368 + got_offset),
3369 htab->elf.splt->contents + h->plt.offset + 24);
3370 }
3371 else if (got_offset < 4096)
3372 {
3373 /* The GOT offset is small enough to be used directly as
3374 displacement. */
3375 memcpy (htab->elf.splt->contents + h->plt.offset,
3376 elf_s390_plt_pic12_entry,
3377 PLT_ENTRY_SIZE);
3378
3379 /* Put in the GOT offset as displacement value. The 0xc000
3380 value comes from the first word of the plt entry. Look
3381 at the elf_s390_plt_pic12_entry content. */
3382 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3383 htab->elf.splt->contents + h->plt.offset + 2);
3384
3385 /* Adjust the jump to the first plt entry. */
3386 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3387 htab->elf.splt->contents + h->plt.offset + 20);
3388 }
3389 else if (got_offset < 32768)
3390 {
3391 /* The GOT offset is too big for a displacement but small
3392 enough to be a signed 16 bit immediate value as it can be
3393 used in an lhi instruction. */
3394 memcpy (htab->elf.splt->contents + h->plt.offset,
3395 elf_s390_plt_pic16_entry,
3396 PLT_ENTRY_SIZE);
3397
3398 /* Put in the GOT offset for the lhi instruction. */
3399 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3400 htab->elf.splt->contents + h->plt.offset + 2);
3401
3402 /* Adjust the jump to the first plt entry. */
3403 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3404 htab->elf.splt->contents + h->plt.offset + 20);
3405 }
3406 else
3407 {
3408 memcpy (htab->elf.splt->contents + h->plt.offset,
3409 elf_s390_plt_pic_entry,
3410 PLT_ENTRY_SIZE);
3411
3412 /* Adjust the jump to the first plt entry. */
3413 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3414 htab->elf.splt->contents + h->plt.offset + 20);
3415
3416 /* Push the GOT offset field. */
3417 bfd_put_32 (output_bfd, got_offset,
3418 htab->elf.splt->contents + h->plt.offset + 24);
3419 }
3420 /* Insert offset into reloc. table here. */
3421 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3422 htab->elf.splt->contents + h->plt.offset + 28);
3423
3424 /* Fill in the entry in the global offset table.
3425 Points to instruction after GOT offset. */
3426 bfd_put_32 (output_bfd,
3427 (htab->elf.splt->output_section->vma
3428 + htab->elf.splt->output_offset
3429 + h->plt.offset
3430 + 12),
3431 htab->elf.sgotplt->contents + got_offset);
3432
3433 /* Fill in the entry in the .rela.plt section. */
3434 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3435 + htab->elf.sgotplt->output_offset
3436 + got_offset);
3437 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3438 rela.r_addend = 0;
3439 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3440 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3441
3442 if (!h->def_regular)
3443 {
3444 /* Mark the symbol as undefined, rather than as defined in
3445 the .plt section. Leave the value alone. This is a clue
3446 for the dynamic linker, to make function pointer
3447 comparisons work between an application and shared
3448 library. */
3449 sym->st_shndx = SHN_UNDEF;
3450 }
3451 }
3452 }
3453
3454 if (h->got.offset != (bfd_vma) -1
3455 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3456 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3457 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3458 {
3459 Elf_Internal_Rela rela;
3460 bfd_byte *loc;
3461
3462 /* This symbol has an entry in the global offset table. Set it
3463 up. */
3464
3465 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3466 abort ();
3467
3468 rela.r_offset = (htab->elf.sgot->output_section->vma
3469 + htab->elf.sgot->output_offset
3470 + (h->got.offset &~ (bfd_vma) 1));
3471
3472 /* If this is a static link, or it is a -Bsymbolic link and the
3473 symbol is defined locally or was forced to be local because
3474 of a version file, we just want to emit a RELATIVE reloc.
3475 The entry in the global offset table will already have been
3476 initialized in the relocate_section function. */
3477 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3478 {
3479 if (bfd_link_pic (info))
3480 {
3481 /* An explicit GOT slot usage needs GLOB_DAT. If the
3482 symbol references local the implicit got.iplt slot
3483 will be used and the IRELATIVE reloc has been created
3484 above. */
3485 goto do_glob_dat;
3486 }
3487 else
3488 {
3489 /* For non-shared objects explicit GOT slots must be
3490 filled with the PLT slot address for pointer
3491 equality reasons. */
3492 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3493 + htab->elf.iplt->output_offset
3494 + h->plt.offset),
3495 htab->elf.sgot->contents + h->got.offset);
3496 return true;
3497 }
3498 }
3499 else if (bfd_link_pic (info)
3500 && SYMBOL_REFERENCES_LOCAL (info, h))
3501 {
3502 /* If this is a static link, or it is a -Bsymbolic link and
3503 the symbol is defined locally or was forced to be local
3504 because of a version file, we just want to emit a
3505 RELATIVE reloc. The entry in the global offset table
3506 will already have been initialized in the
3507 relocate_section function. */
3508 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
3509 return false;
3510 BFD_ASSERT((h->got.offset & 1) != 0);
3511 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3512 rela.r_addend = (h->root.u.def.value
3513 + h->root.u.def.section->output_section->vma
3514 + h->root.u.def.section->output_offset);
3515 }
3516 else
3517 {
3518 BFD_ASSERT((h->got.offset & 1) == 0);
3519 do_glob_dat:
3520 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3521 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3522 rela.r_addend = 0;
3523 }
3524
3525 loc = htab->elf.srelgot->contents;
3526 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3527 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3528 }
3529
3530 if (h->needs_copy)
3531 {
3532 Elf_Internal_Rela rela;
3533 asection *s;
3534 bfd_byte *loc;
3535
3536 /* This symbols needs a copy reloc. Set it up. */
3537
3538 if (h->dynindx == -1
3539 || (h->root.type != bfd_link_hash_defined
3540 && h->root.type != bfd_link_hash_defweak)
3541 || htab->elf.srelbss == NULL
3542 || htab->elf.sreldynrelro == NULL)
3543 abort ();
3544
3545 rela.r_offset = (h->root.u.def.value
3546 + h->root.u.def.section->output_section->vma
3547 + h->root.u.def.section->output_offset);
3548 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3549 rela.r_addend = 0;
3550 if (h->root.u.def.section == htab->elf.sdynrelro)
3551 s = htab->elf.sreldynrelro;
3552 else
3553 s = htab->elf.srelbss;
3554 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
3555 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3556 }
3557
3558 /* Mark some specially defined symbols as absolute. */
3559 if (h == htab->elf.hdynamic
3560 || h == htab->elf.hgot
3561 || h == htab->elf.hplt)
3562 sym->st_shndx = SHN_ABS;
3563
3564 return true;
3565 }
3566
3567 /* Used to decide how to sort relocs in an optimal manner for the
3568 dynamic linker, before writing them out. */
3569
3570 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)3571 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3572 const asection *rel_sec ATTRIBUTE_UNUSED,
3573 const Elf_Internal_Rela *rela)
3574 {
3575 bfd *abfd = info->output_bfd;
3576 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3577 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3578 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3579 Elf_Internal_Sym sym;
3580
3581 if (htab->elf.dynsym == NULL
3582 || !bed->s->swap_symbol_in (abfd,
3583 (htab->elf.dynsym->contents
3584 + r_symndx * bed->s->sizeof_sym),
3585 0, &sym))
3586 abort ();
3587
3588 /* Check relocation against STT_GNU_IFUNC symbol. */
3589 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3590 return reloc_class_ifunc;
3591
3592 switch ((int) ELF32_R_TYPE (rela->r_info))
3593 {
3594 case R_390_RELATIVE:
3595 return reloc_class_relative;
3596 case R_390_JMP_SLOT:
3597 return reloc_class_plt;
3598 case R_390_COPY:
3599 return reloc_class_copy;
3600 default:
3601 return reloc_class_normal;
3602 }
3603 }
3604
3605 /* Finish up the dynamic sections. */
3606
3607 static bool
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3608 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3609 struct bfd_link_info *info)
3610 {
3611 struct elf_s390_link_hash_table *htab;
3612 bfd *dynobj;
3613 asection *sdyn;
3614 bfd *ibfd;
3615 unsigned int i;
3616
3617 htab = elf_s390_hash_table (info);
3618 dynobj = htab->elf.dynobj;
3619 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3620
3621 if (htab->elf.dynamic_sections_created)
3622 {
3623 Elf32_External_Dyn *dyncon, *dynconend;
3624
3625 if (sdyn == NULL || htab->elf.sgot == NULL)
3626 abort ();
3627
3628 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3629 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3630 for (; dyncon < dynconend; dyncon++)
3631 {
3632 Elf_Internal_Dyn dyn;
3633 asection *s;
3634
3635 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3636
3637 switch (dyn.d_tag)
3638 {
3639 default:
3640 continue;
3641
3642 case DT_PLTGOT:
3643 s = htab->elf.sgotplt;
3644 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3645 break;
3646
3647 case DT_JMPREL:
3648 s = htab->elf.srelplt;
3649 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3650 break;
3651
3652 case DT_PLTRELSZ:
3653 dyn.d_un.d_val = htab->elf.srelplt->size;
3654 if (htab->elf.irelplt)
3655 dyn.d_un.d_val += htab->elf.irelplt->size;
3656 break;
3657 }
3658
3659 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3660 }
3661
3662 /* Fill in the special first entry in the procedure linkage table. */
3663 if (htab->elf.splt && htab->elf.splt->size > 0)
3664 {
3665 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3666 if (bfd_link_pic (info))
3667 {
3668 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3669 PLT_FIRST_ENTRY_SIZE);
3670 }
3671 else
3672 {
3673 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3674 PLT_FIRST_ENTRY_SIZE);
3675 bfd_put_32 (output_bfd,
3676 htab->elf.sgotplt->output_section->vma
3677 + htab->elf.sgotplt->output_offset,
3678 htab->elf.splt->contents + 24);
3679 }
3680 elf_section_data (htab->elf.splt->output_section)
3681 ->this_hdr.sh_entsize = 4;
3682 }
3683
3684 }
3685
3686 if (htab->elf.sgotplt)
3687 {
3688 /* Fill in the first three entries in the global offset table. */
3689 if (htab->elf.sgotplt->size > 0)
3690 {
3691 bfd_put_32 (output_bfd,
3692 (sdyn == NULL ? (bfd_vma) 0
3693 : sdyn->output_section->vma + sdyn->output_offset),
3694 htab->elf.sgotplt->contents);
3695 /* One entry for shared object struct ptr. */
3696 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3697 /* One entry for _dl_runtime_resolve. */
3698 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3699 }
3700
3701 elf_section_data (htab->elf.sgotplt->output_section)
3702 ->this_hdr.sh_entsize = 4;
3703 }
3704 /* Finish dynamic symbol for local IFUNC symbols. */
3705 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3706 {
3707 struct plt_entry *local_plt;
3708 Elf_Internal_Sym *isym;
3709 Elf_Internal_Shdr *symtab_hdr;
3710
3711 symtab_hdr = &elf_symtab_hdr (ibfd);
3712
3713 if (!is_s390_elf (ibfd))
3714 continue;
3715
3716 local_plt = elf_s390_local_plt (ibfd);
3717 if (local_plt != NULL)
3718 for (i = 0; i < symtab_hdr->sh_info; i++)
3719 {
3720 if (local_plt[i].plt.offset != (bfd_vma) -1)
3721 {
3722 asection *sec = local_plt[i].sec;
3723 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i);
3724 if (isym == NULL)
3725 return false;
3726
3727 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3728 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3729 local_plt[i].plt.offset,
3730 isym->st_value
3731 + sec->output_section->vma
3732 + sec->output_offset);
3733
3734 }
3735 }
3736 }
3737 return true;
3738 }
3739
3740 /* Support for core dump NOTE sections. */
3741
3742 static bool
elf_s390_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)3743 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3744 {
3745 int offset;
3746 unsigned int size;
3747
3748 switch (note->descsz)
3749 {
3750 default:
3751 return false;
3752
3753 case 224: /* S/390 Linux. */
3754 /* pr_cursig */
3755 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3756
3757 /* pr_pid */
3758 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
3759
3760 /* pr_reg */
3761 offset = 72;
3762 size = 144;
3763 break;
3764 }
3765
3766 /* Make a ".reg/999" section. */
3767 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3768 size, note->descpos + offset);
3769 }
3770
3771 static bool
elf_s390_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)3772 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3773 {
3774 switch (note->descsz)
3775 {
3776 default:
3777 return false;
3778
3779 case 124: /* sizeof(struct elf_prpsinfo) on s390 */
3780 elf_tdata (abfd)->core->pid
3781 = bfd_get_32 (abfd, note->descdata + 12);
3782 elf_tdata (abfd)->core->program
3783 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
3784 elf_tdata (abfd)->core->command
3785 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
3786 break;
3787 }
3788
3789 /* Note that for some reason, a spurious space is tacked
3790 onto the end of the args in some (at least one anyway)
3791 implementations, so strip it off if it exists. */
3792
3793 {
3794 char *command = elf_tdata (abfd)->core->command;
3795 int n = strlen (command);
3796
3797 if (0 < n && command[n - 1] == ' ')
3798 command[n - 1] = '\0';
3799 }
3800
3801 return true;
3802 }
3803
3804 static char *
elf_s390_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)3805 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3806 int note_type, ...)
3807 {
3808 va_list ap;
3809
3810 switch (note_type)
3811 {
3812 default:
3813 return NULL;
3814
3815 case NT_PRPSINFO:
3816 {
3817 char data[124] ATTRIBUTE_NONSTRING = { 0 };
3818 const char *fname, *psargs;
3819
3820 va_start (ap, note_type);
3821 fname = va_arg (ap, const char *);
3822 psargs = va_arg (ap, const char *);
3823 va_end (ap);
3824
3825 strncpy (data + 28, fname, 16);
3826 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3827 DIAGNOSTIC_PUSH;
3828 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
3829 -Wstringop-truncation:
3830 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
3831 */
3832 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
3833 #endif
3834 strncpy (data + 44, psargs, 80);
3835 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3836 DIAGNOSTIC_POP;
3837 #endif
3838 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3839 &data, sizeof (data));
3840 }
3841
3842 case NT_PRSTATUS:
3843 {
3844 char data[224] = { 0 };
3845 long pid;
3846 int cursig;
3847 const void *gregs;
3848
3849 va_start (ap, note_type);
3850 pid = va_arg (ap, long);
3851 cursig = va_arg (ap, int);
3852 gregs = va_arg (ap, const void *);
3853 va_end (ap);
3854
3855 bfd_put_16 (abfd, cursig, data + 12);
3856 bfd_put_32 (abfd, pid, data + 24);
3857 memcpy (data + 72, gregs, 144);
3858 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3859 &data, sizeof (data));
3860 }
3861 }
3862 /* NOTREACHED */
3863 }
3864
3865 /* Return address for Ith PLT stub in section PLT, for relocation REL
3866 or (bfd_vma) -1 if it should not be included. */
3867
3868 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3869 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3870 const arelent *rel ATTRIBUTE_UNUSED)
3871 {
3872 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3873 }
3874
3875 /* Merge backend specific data from an object file to the output
3876 object file when linking. */
3877
3878 static bool
elf32_s390_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)3879 elf32_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3880 {
3881 bfd *obfd = info->output_bfd;
3882
3883 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
3884 return true;
3885
3886 if (!elf_s390_merge_obj_attributes (ibfd, info))
3887 return false;
3888
3889 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3890 return true;
3891 }
3892
3893
3894 #define TARGET_BIG_SYM s390_elf32_vec
3895 #define TARGET_BIG_NAME "elf32-s390"
3896 #define ELF_ARCH bfd_arch_s390
3897 #define ELF_TARGET_ID S390_ELF_DATA
3898 #define ELF_MACHINE_CODE EM_S390
3899 #define ELF_MACHINE_ALT1 EM_S390_OLD
3900 #define ELF_MAXPAGESIZE 0x1000
3901
3902 #define elf_backend_can_gc_sections 1
3903 #define elf_backend_can_refcount 1
3904 #define elf_backend_want_got_plt 1
3905 #define elf_backend_plt_readonly 1
3906 #define elf_backend_want_plt_sym 0
3907 #define elf_backend_got_header_size 12
3908 #define elf_backend_want_dynrelro 1
3909 #define elf_backend_rela_normal 1
3910
3911 #define elf_info_to_howto elf_s390_info_to_howto
3912
3913 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3914 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3915 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3916 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3917
3918 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
3919
3920 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3921 #define elf_backend_check_relocs elf_s390_check_relocs
3922 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3923 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3924 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3925 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3926 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3927 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3928 #define elf_backend_relocate_section elf_s390_relocate_section
3929 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3930 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3931 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3932 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
3933 #define elf_backend_write_core_note elf_s390_write_core_note
3934 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3935 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
3936
3937 #define bfd_elf32_mkobject elf_s390_mkobject
3938 #define elf_backend_object_p elf_s390_object_p
3939
3940 #define elf_backend_linux_prpsinfo32_ugid16 true
3941
3942 #include "elf32-target.h"
3943