1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright (C) 2000-2024 Free Software Foundation, Inc.
3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
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 "elf-s390.h"
29 #include <stdarg.h>
30
31 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
32 from smaller values. Start with zero, widen, *then* decrement. */
33 #define MINUS_ONE (((bfd_vma)0) - 1)
34
35 static bfd_reloc_status_type
36 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
37 asection *, bfd *, char **);
38 static bfd_reloc_status_type
39 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
40 asection *, bfd *, char **);
41
42 /* The relocation "howto" table. */
43 static reloc_howto_type elf_howto_table[] =
44 {
45 HOWTO (R_390_NONE, /* type */
46 0, /* rightshift */
47 0, /* size */
48 0, /* bitsize */
49 false, /* pc_relative */
50 0, /* bitpos */
51 complain_overflow_dont, /* complain_on_overflow */
52 bfd_elf_generic_reloc, /* special_function */
53 "R_390_NONE", /* name */
54 false, /* partial_inplace */
55 0, /* src_mask */
56 0, /* dst_mask */
57 false), /* pcrel_offset */
58
59 HOWTO(R_390_8, 0, 1, 8, false, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
61 HOWTO(R_390_12, 0, 2, 12, false, 0, complain_overflow_dont,
62 bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
63 HOWTO(R_390_16, 0, 2, 16, false, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
65 HOWTO(R_390_32, 0, 4, 32, false, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
67 HOWTO(R_390_PC32, 0, 4, 32, true, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
69 HOWTO(R_390_GOT12, 0, 2, 12, false, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
71 HOWTO(R_390_GOT32, 0, 4, 32, false, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
73 HOWTO(R_390_PLT32, 0, 4, 32, true, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
75 HOWTO(R_390_COPY, 0, 8, 64, false, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
77 HOWTO(R_390_GLOB_DAT, 0, 8, 64, false, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_390_GLOB_DAT", false, 0,MINUS_ONE, false),
79 HOWTO(R_390_JMP_SLOT, 0, 8, 64, false, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_390_JMP_SLOT", false, 0,MINUS_ONE, false),
81 HOWTO(R_390_RELATIVE, 0, 8, 64, true, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_390_RELATIVE", false, 0,MINUS_ONE, false),
83 HOWTO(R_390_GOTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_390_GOTOFF32", false, 0,MINUS_ONE, false),
85 HOWTO(R_390_GOTPC, 0, 8, 64, true, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
87 HOWTO(R_390_GOT16, 0, 2, 16, false, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
89 HOWTO(R_390_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
91 HOWTO(R_390_PC16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
93 HOWTO(R_390_PLT16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
95 HOWTO(R_390_PC32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
97 HOWTO(R_390_PLT32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
99 HOWTO(R_390_GOTPCDBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
101 HOWTO(R_390_64, 0, 8, 64, false, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
103 HOWTO(R_390_PC64, 0, 8, 64, true, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
105 HOWTO(R_390_GOT64, 0, 8, 64, false, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
107 HOWTO(R_390_PLT64, 0, 8, 64, true, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
109 HOWTO(R_390_GOTENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
111 HOWTO(R_390_GOTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_390_GOTOFF16", false, 0,0x0000ffff, false),
113 HOWTO(R_390_GOTOFF64, 0, 8, 64, false, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_390_GOTOFF64", false, 0,MINUS_ONE, false),
115 HOWTO(R_390_GOTPLT12, 0, 2, 12, false, 0, complain_overflow_dont,
116 bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false),
117 HOWTO(R_390_GOTPLT16, 0, 2, 16, false, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false),
119 HOWTO(R_390_GOTPLT32, 0, 4, 32, false, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_GOTPLT32", false, 0,0xffffffff, false),
121 HOWTO(R_390_GOTPLT64, 0, 8, 64, false, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_GOTPLT64", false, 0,MINUS_ONE, false),
123 HOWTO(R_390_GOTPLTENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_GOTPLTENT",false, 0,MINUS_ONE, true),
125 HOWTO(R_390_PLTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false),
127 HOWTO(R_390_PLTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_PLTOFF32", false, 0,0xffffffff, false),
129 HOWTO(R_390_PLTOFF64, 0, 8, 64, false, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_390_PLTOFF64", false, 0,MINUS_ONE, false),
131 HOWTO(R_390_TLS_LOAD, 0, 0, 0, false, 0, complain_overflow_dont,
132 s390_tls_reloc, "R_390_TLS_LOAD", false, 0, 0, false),
133 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
134 s390_tls_reloc, "R_390_TLS_GDCALL", false, 0, 0, false),
135 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
136 s390_tls_reloc, "R_390_TLS_LDCALL", false, 0, 0, false),
137 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
138 HOWTO(R_390_TLS_GD64, 0, 8, 64, false, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_TLS_GD64", false, 0, MINUS_ONE, false),
140 HOWTO(R_390_TLS_GOTIE12, 0, 2, 12, false, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", false, 0, 0x00000fff, false),
142 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
143 HOWTO(R_390_TLS_GOTIE64, 0, 8, 64, false, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", false, 0, MINUS_ONE, false),
145 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
146 HOWTO(R_390_TLS_LDM64, 0, 8, 64, false, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_TLS_LDM64", false, 0, MINUS_ONE, false),
148 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
149 HOWTO(R_390_TLS_IE64, 0, 8, 64, false, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_TLS_IE64", false, 0, MINUS_ONE, false),
151 HOWTO(R_390_TLS_IEENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_390_TLS_IEENT", false, 0, MINUS_ONE, true),
153 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
154 HOWTO(R_390_TLS_LE64, 0, 4, 32, false, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_TLS_LE64", false, 0, MINUS_ONE, false),
156 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
157 HOWTO(R_390_TLS_LDO64, 0, 8, 64, false, 0, complain_overflow_bitfield,
158 bfd_elf_generic_reloc, "R_390_TLS_LDO64", false, 0, MINUS_ONE, false),
159 HOWTO(R_390_TLS_DTPMOD, 0, 8, 64, false, 0, complain_overflow_bitfield,
160 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", false, 0, MINUS_ONE, false),
161 HOWTO(R_390_TLS_DTPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", false, 0, MINUS_ONE, false),
163 HOWTO(R_390_TLS_TPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", false, 0, MINUS_ONE, false),
165 HOWTO(R_390_20, 0, 4, 20, false, 8, complain_overflow_dont,
166 s390_elf_ldisp_reloc, "R_390_20", false, 0,0x0fffff00, false),
167 HOWTO(R_390_GOT20, 0, 4, 20, false, 8, complain_overflow_dont,
168 s390_elf_ldisp_reloc, "R_390_GOT20", false, 0,0x0fffff00, false),
169 HOWTO(R_390_GOTPLT20, 0, 4, 20, false, 8, complain_overflow_dont,
170 s390_elf_ldisp_reloc, "R_390_GOTPLT20", false, 0,0x0fffff00, false),
171 HOWTO(R_390_TLS_GOTIE20, 0, 4, 20, false, 8, complain_overflow_dont,
172 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", false, 0,0x0fffff00, false),
173 HOWTO(R_390_IRELATIVE, 0, 8, 64, false, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_390_IRELATIVE", false, 0, MINUS_ONE, false),
175 HOWTO(R_390_PC12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_PC12DBL", false, 0,0x00000fff, true),
177 HOWTO(R_390_PLT12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true),
179 HOWTO(R_390_PC24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield,
180 bfd_elf_generic_reloc, "R_390_PC24DBL", false, 0,0x00ffffff, true),
181 HOWTO(R_390_PLT24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_390_PLT24DBL", false, 0,0x00ffffff, true),
183 };
184
185 /* GNU extension to record C++ vtable hierarchy. */
186 static reloc_howto_type elf64_s390_vtinherit_howto =
187 HOWTO (R_390_GNU_VTINHERIT, 0,8,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
188 static reloc_howto_type elf64_s390_vtentry_howto =
189 HOWTO (R_390_GNU_VTENTRY, 0,8,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
190
191 static reloc_howto_type *
elf_s390_reloc_type_lookup(bfd * abfd,bfd_reloc_code_real_type code)192 elf_s390_reloc_type_lookup (bfd *abfd,
193 bfd_reloc_code_real_type code)
194 {
195 switch (code)
196 {
197 case BFD_RELOC_NONE:
198 return &elf_howto_table[(int) R_390_NONE];
199 case BFD_RELOC_8:
200 return &elf_howto_table[(int) R_390_8];
201 case BFD_RELOC_390_12:
202 return &elf_howto_table[(int) R_390_12];
203 case BFD_RELOC_16:
204 return &elf_howto_table[(int) R_390_16];
205 case BFD_RELOC_32:
206 return &elf_howto_table[(int) R_390_32];
207 case BFD_RELOC_CTOR:
208 return &elf_howto_table[(int) R_390_32];
209 case BFD_RELOC_32_PCREL:
210 return &elf_howto_table[(int) R_390_PC32];
211 case BFD_RELOC_390_GOT12:
212 return &elf_howto_table[(int) R_390_GOT12];
213 case BFD_RELOC_32_GOT_PCREL:
214 return &elf_howto_table[(int) R_390_GOT32];
215 case BFD_RELOC_390_PLT32:
216 return &elf_howto_table[(int) R_390_PLT32];
217 case BFD_RELOC_390_COPY:
218 return &elf_howto_table[(int) R_390_COPY];
219 case BFD_RELOC_390_GLOB_DAT:
220 return &elf_howto_table[(int) R_390_GLOB_DAT];
221 case BFD_RELOC_390_JMP_SLOT:
222 return &elf_howto_table[(int) R_390_JMP_SLOT];
223 case BFD_RELOC_390_RELATIVE:
224 return &elf_howto_table[(int) R_390_RELATIVE];
225 case BFD_RELOC_32_GOTOFF:
226 return &elf_howto_table[(int) R_390_GOTOFF32];
227 case BFD_RELOC_390_GOTPC:
228 return &elf_howto_table[(int) R_390_GOTPC];
229 case BFD_RELOC_390_GOT16:
230 return &elf_howto_table[(int) R_390_GOT16];
231 case BFD_RELOC_16_PCREL:
232 return &elf_howto_table[(int) R_390_PC16];
233 case BFD_RELOC_390_PC12DBL:
234 return &elf_howto_table[(int) R_390_PC12DBL];
235 case BFD_RELOC_390_PLT12DBL:
236 return &elf_howto_table[(int) R_390_PLT12DBL];
237 case BFD_RELOC_390_PC16DBL:
238 return &elf_howto_table[(int) R_390_PC16DBL];
239 case BFD_RELOC_390_PLT16DBL:
240 return &elf_howto_table[(int) R_390_PLT16DBL];
241 case BFD_RELOC_390_PC24DBL:
242 return &elf_howto_table[(int) R_390_PC24DBL];
243 case BFD_RELOC_390_PLT24DBL:
244 return &elf_howto_table[(int) R_390_PLT24DBL];
245 case BFD_RELOC_390_PC32DBL:
246 return &elf_howto_table[(int) R_390_PC32DBL];
247 case BFD_RELOC_390_PLT32DBL:
248 return &elf_howto_table[(int) R_390_PLT32DBL];
249 case BFD_RELOC_390_GOTPCDBL:
250 return &elf_howto_table[(int) R_390_GOTPCDBL];
251 case BFD_RELOC_64:
252 return &elf_howto_table[(int) R_390_64];
253 case BFD_RELOC_64_PCREL:
254 return &elf_howto_table[(int) R_390_PC64];
255 case BFD_RELOC_390_GOT64:
256 return &elf_howto_table[(int) R_390_GOT64];
257 case BFD_RELOC_390_PLT64:
258 return &elf_howto_table[(int) R_390_PLT64];
259 case BFD_RELOC_390_GOTENT:
260 return &elf_howto_table[(int) R_390_GOTENT];
261 case BFD_RELOC_16_GOTOFF:
262 return &elf_howto_table[(int) R_390_GOTOFF16];
263 case BFD_RELOC_390_GOTOFF64:
264 return &elf_howto_table[(int) R_390_GOTOFF64];
265 case BFD_RELOC_390_GOTPLT12:
266 return &elf_howto_table[(int) R_390_GOTPLT12];
267 case BFD_RELOC_390_GOTPLT16:
268 return &elf_howto_table[(int) R_390_GOTPLT16];
269 case BFD_RELOC_390_GOTPLT32:
270 return &elf_howto_table[(int) R_390_GOTPLT32];
271 case BFD_RELOC_390_GOTPLT64:
272 return &elf_howto_table[(int) R_390_GOTPLT64];
273 case BFD_RELOC_390_GOTPLTENT:
274 return &elf_howto_table[(int) R_390_GOTPLTENT];
275 case BFD_RELOC_390_PLTOFF16:
276 return &elf_howto_table[(int) R_390_PLTOFF16];
277 case BFD_RELOC_390_PLTOFF32:
278 return &elf_howto_table[(int) R_390_PLTOFF32];
279 case BFD_RELOC_390_PLTOFF64:
280 return &elf_howto_table[(int) R_390_PLTOFF64];
281 case BFD_RELOC_390_TLS_LOAD:
282 return &elf_howto_table[(int) R_390_TLS_LOAD];
283 case BFD_RELOC_390_TLS_GDCALL:
284 return &elf_howto_table[(int) R_390_TLS_GDCALL];
285 case BFD_RELOC_390_TLS_LDCALL:
286 return &elf_howto_table[(int) R_390_TLS_LDCALL];
287 case BFD_RELOC_390_TLS_GD64:
288 return &elf_howto_table[(int) R_390_TLS_GD64];
289 case BFD_RELOC_390_TLS_GOTIE12:
290 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
291 case BFD_RELOC_390_TLS_GOTIE64:
292 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
293 case BFD_RELOC_390_TLS_LDM64:
294 return &elf_howto_table[(int) R_390_TLS_LDM64];
295 case BFD_RELOC_390_TLS_IE64:
296 return &elf_howto_table[(int) R_390_TLS_IE64];
297 case BFD_RELOC_390_TLS_IEENT:
298 return &elf_howto_table[(int) R_390_TLS_IEENT];
299 case BFD_RELOC_390_TLS_LE64:
300 return &elf_howto_table[(int) R_390_TLS_LE64];
301 case BFD_RELOC_390_TLS_LDO64:
302 return &elf_howto_table[(int) R_390_TLS_LDO64];
303 case BFD_RELOC_390_TLS_DTPMOD:
304 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
305 case BFD_RELOC_390_TLS_DTPOFF:
306 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
307 case BFD_RELOC_390_TLS_TPOFF:
308 return &elf_howto_table[(int) R_390_TLS_TPOFF];
309 case BFD_RELOC_390_20:
310 return &elf_howto_table[(int) R_390_20];
311 case BFD_RELOC_390_GOT20:
312 return &elf_howto_table[(int) R_390_GOT20];
313 case BFD_RELOC_390_GOTPLT20:
314 return &elf_howto_table[(int) R_390_GOTPLT20];
315 case BFD_RELOC_390_TLS_GOTIE20:
316 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
317 case BFD_RELOC_390_IRELATIVE:
318 return &elf_howto_table[(int) R_390_IRELATIVE];
319 case BFD_RELOC_VTABLE_INHERIT:
320 return &elf64_s390_vtinherit_howto;
321 case BFD_RELOC_VTABLE_ENTRY:
322 return &elf64_s390_vtentry_howto;
323 default:
324 break;
325 }
326
327 /* xgettext:c-format */
328 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd, (int) code);
329 bfd_set_error (bfd_error_bad_value);
330 return NULL;
331 }
332
333 static reloc_howto_type *
elf_s390_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)334 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
335 const char *r_name)
336 {
337 unsigned int i;
338
339 for (i = 0;
340 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
341 i++)
342 if (elf_howto_table[i].name != NULL
343 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
344 return &elf_howto_table[i];
345
346 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
347 return &elf64_s390_vtinherit_howto;
348 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
349 return &elf64_s390_vtentry_howto;
350
351 return NULL;
352 }
353
354 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
355 and elf64-s390.c has its own copy. */
356
357 static bool
elf_s390_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)358 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
359 arelent *cache_ptr,
360 Elf_Internal_Rela *dst)
361 {
362 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
363
364 switch (r_type)
365 {
366 case R_390_GNU_VTINHERIT:
367 cache_ptr->howto = &elf64_s390_vtinherit_howto;
368 break;
369
370 case R_390_GNU_VTENTRY:
371 cache_ptr->howto = &elf64_s390_vtentry_howto;
372 break;
373
374 default:
375 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
376 {
377 /* xgettext:c-format */
378 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
379 abfd, r_type);
380 bfd_set_error (bfd_error_bad_value);
381 return false;
382 }
383 cache_ptr->howto = &elf_howto_table[r_type];
384 }
385 return true;
386 }
387
388 /* A relocation function which doesn't do anything. */
389 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)390 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
391 arelent *reloc_entry,
392 asymbol *symbol ATTRIBUTE_UNUSED,
393 void * data ATTRIBUTE_UNUSED,
394 asection *input_section,
395 bfd *output_bfd,
396 char **error_message ATTRIBUTE_UNUSED)
397 {
398 if (output_bfd)
399 reloc_entry->address += input_section->output_offset;
400 return bfd_reloc_ok;
401 }
402
403 /* Handle the large displacement relocs. */
404 static bfd_reloc_status_type
s390_elf_ldisp_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)405 s390_elf_ldisp_reloc (bfd *abfd,
406 arelent *reloc_entry,
407 asymbol *symbol,
408 void * data,
409 asection *input_section,
410 bfd *output_bfd,
411 char **error_message ATTRIBUTE_UNUSED)
412 {
413 reloc_howto_type *howto = reloc_entry->howto;
414 bfd_vma relocation;
415 bfd_vma insn;
416
417 if (output_bfd != (bfd *) NULL
418 && (symbol->flags & BSF_SECTION_SYM) == 0
419 && (! howto->partial_inplace
420 || reloc_entry->addend == 0))
421 {
422 reloc_entry->address += input_section->output_offset;
423 return bfd_reloc_ok;
424 }
425 if (output_bfd != NULL)
426 return bfd_reloc_continue;
427
428 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
429 return bfd_reloc_outofrange;
430
431 relocation = (symbol->value
432 + symbol->section->output_section->vma
433 + symbol->section->output_offset);
434 relocation += reloc_entry->addend;
435 if (howto->pc_relative)
436 {
437 relocation -= (input_section->output_section->vma
438 + input_section->output_offset);
439 relocation -= reloc_entry->address;
440 }
441
442 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
443 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
444 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
445
446 if ((bfd_signed_vma) relocation < - 0x80000
447 || (bfd_signed_vma) relocation > 0x7ffff)
448 return bfd_reloc_overflow;
449 else
450 return bfd_reloc_ok;
451 }
452
453 static bool
elf_s390_is_local_label_name(bfd * abfd,const char * name)454 elf_s390_is_local_label_name (bfd *abfd, const char *name)
455 {
456 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
457 return true;
458
459 return _bfd_elf_is_local_label_name (abfd, name);
460 }
461
462 /* Functions for the 390 ELF linker. */
463
464 /* The name of the dynamic interpreter. This is put in the .interp
465 section. */
466
467 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
468
469 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
470 copying dynamic variables from a shared lib into an app's dynbss
471 section, and instead use a dynamic relocation to point into the
472 shared lib. */
473 #define ELIMINATE_COPY_RELOCS 1
474
475 /* The size in bytes of the first entry in the procedure linkage table. */
476 #define PLT_FIRST_ENTRY_SIZE 32
477 /* The size in bytes of an entry in the procedure linkage table. */
478 #define PLT_ENTRY_SIZE 32
479
480 #define GOT_ENTRY_SIZE 8
481
482 #define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela)
483
484 /* The first three entries in a global offset table are reserved,
485 and the initial contents are unimportant (we zero them out).
486 Subsequent entries look like this. See the SVR4 ABI 386
487 supplement to see how this works. */
488
489 /* For the s390, simple addr offset can only be 0 - 4096.
490 To use the full 16777216 TB address space, several instructions
491 are needed to load an address in a register and execute
492 a branch( or just saving the address)
493
494 Furthermore, only r 0 and 1 are free to use!!! */
495
496 /* The first 3 words in the GOT are then reserved.
497 Word 0 is the address of the dynamic table.
498 Word 1 is a pointer to a structure describing the object
499 Word 2 is used to point to the loader entry address.
500
501 The code for PLT entries looks like this:
502
503 The GOT holds the address in the PLT to be executed.
504 The loader then gets:
505 48(15) = Pointer to the structure describing the object.
506 56(15) = Offset in symbol table
507 The loader must then find the module where the function is
508 and insert the address in the GOT.
509
510 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
511 LG 1,0(1) # 6 bytes Load address from GOT in r1
512 BCR 15,1 # 2 bytes Jump to address
513 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
514 LGF 1,12(1) # 6 bytes Load rela.plt offset into r1
515 BRCL 15,-x # 6 bytes Jump to first PLT entry
516 .long ? # 4 bytes offset into .rela.plt
517
518 Total = 32 bytes per PLT entry
519 Fixup at offset 2: relative address to GOT entry
520 Fixup at offset 22: relative branch to PLT0
521 Fixup at offset 28: 32 bit offset into .rela.plt
522
523 A 32 bit offset into the symbol table is enough. It allows for
524 .rela.plt sections up to a size of 2 gigabyte. A single dynamic
525 object (the main program, any shared library) is limited to 4GB in
526 size. Having a .rela.plt of 2GB would already make the .plt
527 section bigger than 8GB. */
528
529 static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] =
530 {
531 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
532 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, /* lg %r1,0(%r1) */
533 0x07, 0xf1, /* br %r1 */
534 0x0d, 0x10, /* basr %r1,%r0 */
535 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, /* lgf %r1,12(%r1) */
536 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, /* jg first plt */
537 0x00, 0x00, 0x00, 0x00 /* .long 0x00000000 */
538 };
539
540 /* The first PLT entry pushes the offset into the symbol table
541 from R1 onto the stack at 56(15) and the loader object info
542 at 48(15), loads the loader address in R1 and jumps to it. */
543
544 /* The first entry in the PLT:
545
546 PLT0:
547 STG 1,56(15) # r1 contains the offset into the symbol table
548 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
549 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
550 LG 1,16(1) # get entry address of loader
551 BCR 15,1 # jump to loader
552
553 Fixup at offset 8: relative address to start of GOT. */
554
555 static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] =
556 {
557 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, /* stg %r1,56(%r15) */
558 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
559 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, /* mvc 48(8,%r15),8(%r1) */
560 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, /* lg %r1,16(%r1) */
561 0x07, 0xf1, /* br %r1 */
562 0x07, 0x00, /* nopr %r0 */
563 0x07, 0x00, /* nopr %r0 */
564 0x07, 0x00 /* nopr %r0 */
565 };
566
567
568 /* s390 ELF linker hash entry. */
569
570 struct elf_s390_link_hash_entry
571 {
572 struct elf_link_hash_entry elf;
573
574 /* Number of GOTPLT references for a function. */
575 bfd_signed_vma gotplt_refcount;
576
577 #define GOT_UNKNOWN 0
578 #define GOT_NORMAL 1
579 #define GOT_TLS_GD 2
580 #define GOT_TLS_IE 3
581 #define GOT_TLS_IE_NLT 3
582 unsigned char tls_type;
583
584 /* For pointer equality reasons we might need to change the symbol
585 type from STT_GNU_IFUNC to STT_FUNC together with its value and
586 section entry. So after alloc_dynrelocs only these values should
587 be used. In order to check whether a symbol is IFUNC use
588 s390_is_ifunc_symbol_p. */
589 bfd_vma ifunc_resolver_address;
590 asection *ifunc_resolver_section;
591 };
592
593 #define elf_s390_hash_entry(ent) \
594 ((struct elf_s390_link_hash_entry *)(ent))
595
596 /* This structure represents an entry in the local PLT list needed for
597 local IFUNC symbols. */
598 struct plt_entry
599 {
600 /* The section of the local symbol.
601 Set in relocate_section and used in finish_dynamic_sections. */
602 asection *sec;
603
604 union
605 {
606 bfd_signed_vma refcount;
607 bfd_vma offset;
608 } plt;
609 };
610
611 /* NOTE: Keep this structure in sync with
612 the one declared in elf32-s390.c. */
613 struct elf_s390_obj_tdata
614 {
615 struct elf_obj_tdata root;
616
617 /* A local PLT is needed for ifunc symbols. */
618 struct plt_entry *local_plt;
619
620 /* TLS type for each local got entry. */
621 char *local_got_tls_type;
622 };
623
624 #define elf_s390_tdata(abfd) \
625 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
626
627 #define elf_s390_local_plt(abfd) \
628 (elf_s390_tdata (abfd)->local_plt)
629
630 #define elf_s390_local_got_tls_type(abfd) \
631 (elf_s390_tdata (abfd)->local_got_tls_type)
632
633 #define is_s390_elf(bfd) \
634 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
635 && elf_tdata (bfd) != NULL \
636 && elf_object_id (bfd) == S390_ELF_DATA)
637
638 static bool
elf_s390_mkobject(bfd * abfd)639 elf_s390_mkobject (bfd *abfd)
640 {
641 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
642 S390_ELF_DATA);
643 }
644
645 static bool
elf_s390_object_p(bfd * abfd)646 elf_s390_object_p (bfd *abfd)
647 {
648 /* Set the right machine number for an s390 elf32 file. */
649 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
650 }
651
652 /* s390 ELF linker hash table. */
653
654 struct elf_s390_link_hash_table
655 {
656 struct elf_link_hash_table elf;
657
658 /* Short-cuts to get to dynamic linker sections. */
659 asection *irelifunc;
660
661 union {
662 bfd_signed_vma refcount;
663 bfd_vma offset;
664 } tls_ldm_got;
665
666 /* Options passed from the linker. */
667 struct s390_elf_params *params;
668 };
669
670 /* Get the s390 ELF linker hash table from a link_info structure. */
671
672 #define elf_s390_hash_table(p) \
673 ((is_elf_hash_table ((p)->hash) \
674 && elf_hash_table_id (elf_hash_table (p)) == S390_ELF_DATA) \
675 ? (struct elf_s390_link_hash_table *) (p)->hash : NULL)
676
677 #define ELF64 1
678 #include "elf-s390-common.c"
679
680 /* Create an entry in an s390 ELF linker hash table. */
681
682 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)683 link_hash_newfunc (struct bfd_hash_entry *entry,
684 struct bfd_hash_table *table,
685 const char *string)
686 {
687 /* Allocate the structure if it has not already been allocated by a
688 subclass. */
689 if (entry == NULL)
690 {
691 entry = bfd_hash_allocate (table,
692 sizeof (struct elf_s390_link_hash_entry));
693 if (entry == NULL)
694 return entry;
695 }
696
697 /* Call the allocation method of the superclass. */
698 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
699 if (entry != NULL)
700 {
701 struct elf_s390_link_hash_entry *eh;
702
703 eh = (struct elf_s390_link_hash_entry *) entry;
704 eh->gotplt_refcount = 0;
705 eh->tls_type = GOT_UNKNOWN;
706 eh->ifunc_resolver_address = 0;
707 eh->ifunc_resolver_section = NULL;
708 }
709
710 return entry;
711 }
712
713 /* Create an s390 ELF linker hash table. */
714
715 static struct bfd_link_hash_table *
elf_s390_link_hash_table_create(bfd * abfd)716 elf_s390_link_hash_table_create (bfd *abfd)
717 {
718 struct elf_s390_link_hash_table *ret;
719 size_t amt = sizeof (struct elf_s390_link_hash_table);
720
721 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
722 if (ret == NULL)
723 return NULL;
724
725 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
726 sizeof (struct elf_s390_link_hash_entry),
727 S390_ELF_DATA))
728 {
729 free (ret);
730 return NULL;
731 }
732
733 return &ret->elf.root;
734 }
735
736 /* Copy the extra info we tack onto an elf_link_hash_entry. */
737
738 static void
elf_s390_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)739 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
740 struct elf_link_hash_entry *dir,
741 struct elf_link_hash_entry *ind)
742 {
743 struct elf_s390_link_hash_entry *edir, *eind;
744
745 edir = (struct elf_s390_link_hash_entry *) dir;
746 eind = (struct elf_s390_link_hash_entry *) ind;
747
748 if (ind->root.type == bfd_link_hash_indirect
749 && dir->got.refcount <= 0)
750 {
751 edir->tls_type = eind->tls_type;
752 eind->tls_type = GOT_UNKNOWN;
753 }
754
755 if (ELIMINATE_COPY_RELOCS
756 && ind->root.type != bfd_link_hash_indirect
757 && dir->dynamic_adjusted)
758 {
759 /* If called to transfer flags for a weakdef during processing
760 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
761 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
762 if (dir->versioned != versioned_hidden)
763 dir->ref_dynamic |= ind->ref_dynamic;
764 dir->ref_regular |= ind->ref_regular;
765 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
766 dir->needs_plt |= ind->needs_plt;
767 }
768 else
769 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
770 }
771
772 static int
elf_s390_tls_transition(struct bfd_link_info * info,int r_type,int is_local)773 elf_s390_tls_transition (struct bfd_link_info *info,
774 int r_type,
775 int is_local)
776 {
777 if (bfd_link_dll (info))
778 return r_type;
779
780 switch (r_type)
781 {
782 case R_390_TLS_GD64:
783 case R_390_TLS_IE64:
784 if (is_local)
785 return R_390_TLS_LE64;
786 return R_390_TLS_IE64;
787 case R_390_TLS_GOTIE64:
788 if (is_local)
789 return R_390_TLS_LE64;
790 return R_390_TLS_GOTIE64;
791 case R_390_TLS_LDM64:
792 return R_390_TLS_LE64;
793 }
794
795 return r_type;
796 }
797
798 /* Look through the relocs for a section during the first phase, and
799 allocate space in the global offset table or procedure linkage
800 table. */
801
802 static bool
elf_s390_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)803 elf_s390_check_relocs (bfd *abfd,
804 struct bfd_link_info *info,
805 asection *sec,
806 const Elf_Internal_Rela *relocs)
807 {
808 struct elf_s390_link_hash_table *htab;
809 Elf_Internal_Shdr *symtab_hdr;
810 struct elf_link_hash_entry **sym_hashes;
811 const Elf_Internal_Rela *rel;
812 const Elf_Internal_Rela *rel_end;
813 asection *sreloc;
814 bfd_signed_vma *local_got_refcounts;
815 int tls_type, old_tls_type;
816
817 if (bfd_link_relocatable (info))
818 return true;
819
820 BFD_ASSERT (is_s390_elf (abfd));
821
822 htab = elf_s390_hash_table (info);
823 if (htab == NULL)
824 return false;
825
826 symtab_hdr = &elf_symtab_hdr (abfd);
827 sym_hashes = elf_sym_hashes (abfd);
828 local_got_refcounts = elf_local_got_refcounts (abfd);
829
830 sreloc = NULL;
831
832 rel_end = relocs + sec->reloc_count;
833 for (rel = relocs; rel < rel_end; rel++)
834 {
835 unsigned int r_type;
836 unsigned int r_symndx;
837 struct elf_link_hash_entry *h;
838 Elf_Internal_Sym *isym;
839
840 r_symndx = ELF64_R_SYM (rel->r_info);
841
842 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
843 {
844 /* xgettext:c-format */
845 _bfd_error_handler (_("%pB: bad symbol index: %d"),
846 abfd, r_symndx);
847 return false;
848 }
849
850 if (r_symndx < symtab_hdr->sh_info)
851 {
852 /* A local symbol. */
853 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
854 abfd, r_symndx);
855 if (isym == NULL)
856 return false;
857
858 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
859 {
860 struct plt_entry *plt;
861
862 if (htab->elf.dynobj == NULL)
863 htab->elf.dynobj = abfd;
864
865 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
866 return false;
867
868 if (local_got_refcounts == NULL)
869 {
870 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
871 return false;
872 local_got_refcounts = elf_local_got_refcounts (abfd);
873 }
874 plt = elf_s390_local_plt (abfd);
875 plt[r_symndx].plt.refcount++;
876 }
877 h = NULL;
878 }
879 else
880 {
881 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
882 while (h->root.type == bfd_link_hash_indirect
883 || h->root.type == bfd_link_hash_warning)
884 h = (struct elf_link_hash_entry *) h->root.u.i.link;
885 }
886
887 /* Create got section and local_got_refcounts array if they
888 are needed. */
889 r_type = elf_s390_tls_transition (info,
890 ELF64_R_TYPE (rel->r_info),
891 h == NULL);
892 switch (r_type)
893 {
894 case R_390_GOT12:
895 case R_390_GOT16:
896 case R_390_GOT20:
897 case R_390_GOT32:
898 case R_390_GOT64:
899 case R_390_GOTENT:
900 case R_390_GOTPLT12:
901 case R_390_GOTPLT16:
902 case R_390_GOTPLT20:
903 case R_390_GOTPLT32:
904 case R_390_GOTPLT64:
905 case R_390_GOTPLTENT:
906 case R_390_TLS_GD64:
907 case R_390_TLS_GOTIE12:
908 case R_390_TLS_GOTIE20:
909 case R_390_TLS_GOTIE64:
910 case R_390_TLS_IEENT:
911 case R_390_TLS_IE64:
912 case R_390_TLS_LDM64:
913 if (h == NULL
914 && local_got_refcounts == NULL)
915 {
916 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
917 return false;
918 local_got_refcounts = elf_local_got_refcounts (abfd);
919 }
920
921 /* Fall through. */
922 case R_390_GOTOFF16:
923 case R_390_GOTOFF32:
924 case R_390_GOTOFF64:
925 case R_390_GOTPC:
926 case R_390_GOTPCDBL:
927 if (htab->elf.sgot == NULL)
928 {
929 if (htab->elf.dynobj == NULL)
930 htab->elf.dynobj = abfd;
931 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
932 return false;
933 }
934 }
935
936 if (h != NULL)
937 {
938 if (htab->elf.dynobj == NULL)
939 htab->elf.dynobj = abfd;
940 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
941 return false;
942
943 /* Make sure an IFUNC symbol defined in a non-shared object
944 always gets a PLT slot. */
945 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
946 {
947 /* The symbol is called by the dynamic loader in order
948 to resolve the relocation. So it is in fact also
949 referenced. */
950 h->ref_regular = 1;
951 h->needs_plt = 1;
952 }
953 }
954
955 switch (r_type)
956 {
957 case R_390_GOTPC:
958 case R_390_GOTPCDBL:
959 /* These relocs do not need a GOT slot. They just load the
960 GOT pointer itself or address something else relative to
961 the GOT. Since the GOT pointer has been set up above we
962 are done. */
963 break;
964 case R_390_GOTOFF16:
965 case R_390_GOTOFF32:
966 case R_390_GOTOFF64:
967 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
968 break;
969 /* Fall through. */
970
971 case R_390_PLT12DBL:
972 case R_390_PLT16DBL:
973 case R_390_PLT24DBL:
974 case R_390_PLT32:
975 case R_390_PLT32DBL:
976 case R_390_PLT64:
977 case R_390_PLTOFF16:
978 case R_390_PLTOFF32:
979 case R_390_PLTOFF64:
980 /* This symbol requires a procedure linkage table entry. We
981 actually build the entry in adjust_dynamic_symbol,
982 because this might be a case of linking PIC code which is
983 never referenced by a dynamic object, in which case we
984 don't need to generate a procedure linkage table entry
985 after all. */
986
987 /* If this is a local symbol, we resolve it directly without
988 creating a procedure linkage table entry. */
989 if (h != NULL)
990 {
991 h->needs_plt = 1;
992 h->plt.refcount += 1;
993 }
994 break;
995
996 case R_390_GOTPLT12:
997 case R_390_GOTPLT16:
998 case R_390_GOTPLT20:
999 case R_390_GOTPLT32:
1000 case R_390_GOTPLT64:
1001 case R_390_GOTPLTENT:
1002 /* This symbol requires either a procedure linkage table entry
1003 or an entry in the local got. We actually build the entry
1004 in adjust_dynamic_symbol because whether this is really a
1005 global reference can change and with it the fact if we have
1006 to create a plt entry or a local got entry. To be able to
1007 make a once global symbol a local one we have to keep track
1008 of the number of gotplt references that exist for this
1009 symbol. */
1010 if (h != NULL)
1011 {
1012 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1013 h->needs_plt = 1;
1014 h->plt.refcount += 1;
1015 }
1016 else
1017 local_got_refcounts[r_symndx] += 1;
1018 break;
1019
1020 case R_390_TLS_LDM64:
1021 htab->tls_ldm_got.refcount += 1;
1022 break;
1023
1024 case R_390_TLS_IE64:
1025 case R_390_TLS_GOTIE12:
1026 case R_390_TLS_GOTIE20:
1027 case R_390_TLS_GOTIE64:
1028 case R_390_TLS_IEENT:
1029 if (bfd_link_dll (info))
1030 info->flags |= DF_STATIC_TLS;
1031 /* Fall through */
1032
1033 case R_390_GOT12:
1034 case R_390_GOT16:
1035 case R_390_GOT20:
1036 case R_390_GOT32:
1037 case R_390_GOT64:
1038 case R_390_GOTENT:
1039 case R_390_TLS_GD64:
1040 /* This symbol requires a global offset table entry. */
1041 switch (r_type)
1042 {
1043 default:
1044 case R_390_GOT12:
1045 case R_390_GOT16:
1046 case R_390_GOT20:
1047 case R_390_GOT32:
1048 case R_390_GOTENT:
1049 tls_type = GOT_NORMAL;
1050 break;
1051 case R_390_TLS_GD64:
1052 tls_type = GOT_TLS_GD;
1053 break;
1054 case R_390_TLS_IE64:
1055 case R_390_TLS_GOTIE64:
1056 tls_type = GOT_TLS_IE;
1057 break;
1058 case R_390_TLS_GOTIE12:
1059 case R_390_TLS_GOTIE20:
1060 case R_390_TLS_IEENT:
1061 tls_type = GOT_TLS_IE_NLT;
1062 break;
1063 }
1064
1065 if (h != NULL)
1066 {
1067 h->got.refcount += 1;
1068 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1069 }
1070 else
1071 {
1072 local_got_refcounts[r_symndx] += 1;
1073 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1074 }
1075 /* If a TLS symbol is accessed using IE at least once,
1076 there is no point to use dynamic model for it. */
1077 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1078 {
1079 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1080 {
1081 _bfd_error_handler
1082 /* xgettext:c-format */
1083 (_("%pB: `%s' accessed both as normal and thread local symbol"),
1084 abfd, h->root.root.string);
1085 return false;
1086 }
1087 if (old_tls_type > tls_type)
1088 tls_type = old_tls_type;
1089 }
1090
1091 if (old_tls_type != tls_type)
1092 {
1093 if (h != NULL)
1094 elf_s390_hash_entry (h)->tls_type = tls_type;
1095 else
1096 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1097 }
1098
1099 if (r_type != R_390_TLS_IE64)
1100 break;
1101 /* Fall through */
1102
1103 case R_390_TLS_LE64:
1104 /* For static linking and executables this reloc will be
1105 calculated at linktime otherwise a TLS_TPOFF runtime
1106 reloc will be generated. */
1107 if (r_type == R_390_TLS_LE64 && bfd_link_pie (info))
1108 break;
1109
1110 if (!bfd_link_dll (info))
1111 break;
1112 info->flags |= DF_STATIC_TLS;
1113 /* Fall through */
1114
1115 case R_390_8:
1116 case R_390_16:
1117 case R_390_32:
1118 case R_390_64:
1119 case R_390_PC12DBL:
1120 case R_390_PC16:
1121 case R_390_PC16DBL:
1122 case R_390_PC24DBL:
1123 case R_390_PC32:
1124 case R_390_PC32DBL:
1125 case R_390_PC64:
1126 if (h != NULL && bfd_link_executable (info))
1127 {
1128 /* If this reloc is in a read-only section, we might
1129 need a copy reloc. We can't check reliably at this
1130 stage whether the section is read-only, as input
1131 sections have not yet been mapped to output sections.
1132 Tentatively set the flag for now, and correct in
1133 adjust_dynamic_symbol. */
1134 h->non_got_ref = 1;
1135
1136 if (!bfd_link_pic (info))
1137 {
1138 /* We may need a .plt entry if the function this reloc
1139 refers to is in a shared lib. */
1140 h->plt.refcount += 1;
1141 }
1142 }
1143
1144 /* If we are creating a shared library, and this is a reloc
1145 against a global symbol, or a non PC relative reloc
1146 against a local symbol, then we need to copy the reloc
1147 into the shared library. However, if we are linking with
1148 -Bsymbolic, we do not need to copy a reloc against a
1149 global symbol which is defined in an object we are
1150 including in the link (i.e., DEF_REGULAR is set). At
1151 this point we have not seen all the input files, so it is
1152 possible that DEF_REGULAR is not set now but will be set
1153 later (it is never cleared). In case of a weak definition,
1154 DEF_REGULAR may be cleared later by a strong definition in
1155 a shared library. We account for that possibility below by
1156 storing information in the relocs_copied field of the hash
1157 table entry. A similar situation occurs when creating
1158 shared libraries and symbol visibility changes render the
1159 symbol local.
1160
1161 If on the other hand, we are creating an executable, we
1162 may need to keep relocations for symbols satisfied by a
1163 dynamic library if we manage to avoid copy relocs for the
1164 symbol. */
1165 if ((bfd_link_pic (info)
1166 && (sec->flags & SEC_ALLOC) != 0
1167 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1168 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL
1169 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1170 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL
1171 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1172 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1173 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1174 || (h != NULL
1175 && (! SYMBOLIC_BIND (info, h)
1176 || h->root.type == bfd_link_hash_defweak
1177 || !h->def_regular))))
1178 || (ELIMINATE_COPY_RELOCS
1179 && !bfd_link_pic (info)
1180 && (sec->flags & SEC_ALLOC) != 0
1181 && h != NULL
1182 && (h->root.type == bfd_link_hash_defweak
1183 || !h->def_regular)))
1184 {
1185 struct elf_dyn_relocs *p;
1186 struct elf_dyn_relocs **head;
1187
1188 /* We must copy these reloc types into the output file.
1189 Create a reloc section in dynobj and make room for
1190 this reloc. */
1191 if (sreloc == NULL)
1192 {
1193 if (htab->elf.dynobj == NULL)
1194 htab->elf.dynobj = abfd;
1195
1196 sreloc = _bfd_elf_make_dynamic_reloc_section
1197 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ true);
1198
1199 if (sreloc == NULL)
1200 return false;
1201 }
1202
1203 /* If this is a global symbol, we count the number of
1204 relocations we need for this symbol. */
1205 if (h != NULL)
1206 {
1207 head = &h->dyn_relocs;
1208 }
1209 else
1210 {
1211 /* Track dynamic relocs needed for local syms too.
1212 We really need local syms available to do this
1213 easily. Oh well. */
1214 asection *s;
1215 void *vpp;
1216
1217 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1218 abfd, r_symndx);
1219 if (isym == NULL)
1220 return false;
1221
1222 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1223 if (s == NULL)
1224 s = sec;
1225
1226 vpp = &elf_section_data (s)->local_dynrel;
1227 head = (struct elf_dyn_relocs **) vpp;
1228 }
1229
1230 p = *head;
1231 if (p == NULL || p->sec != sec)
1232 {
1233 size_t amt = sizeof *p;
1234 p = ((struct elf_dyn_relocs *)
1235 bfd_alloc (htab->elf.dynobj, amt));
1236 if (p == NULL)
1237 return false;
1238 p->next = *head;
1239 *head = p;
1240 p->sec = sec;
1241 p->count = 0;
1242 p->pc_count = 0;
1243 }
1244
1245 p->count += 1;
1246 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1247 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL
1248 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1249 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1250 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1251 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1252 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1253 p->pc_count += 1;
1254 }
1255 break;
1256
1257 /* This relocation describes the C++ object vtable hierarchy.
1258 Reconstruct it for later use during GC. */
1259 case R_390_GNU_VTINHERIT:
1260 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1261 return false;
1262 break;
1263
1264 /* This relocation describes which C++ vtable entries are actually
1265 used. Record for later use during GC. */
1266 case R_390_GNU_VTENTRY:
1267 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1268 return false;
1269 break;
1270
1271 default:
1272 break;
1273 }
1274 }
1275
1276 return true;
1277 }
1278
1279 /* Return the section that should be marked against GC for a given
1280 relocation. */
1281
1282 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)1283 elf_s390_gc_mark_hook (asection *sec,
1284 struct bfd_link_info *info,
1285 Elf_Internal_Rela *rel,
1286 struct elf_link_hash_entry *h,
1287 Elf_Internal_Sym *sym)
1288 {
1289 if (h != NULL)
1290 switch (ELF64_R_TYPE (rel->r_info))
1291 {
1292 case R_390_GNU_VTINHERIT:
1293 case R_390_GNU_VTENTRY:
1294 return NULL;
1295 }
1296
1297 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1298 }
1299
1300 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1301 entry but we found we will not create any. Called when we find we will
1302 not have any PLT for this symbol, by for example
1303 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1304 or elf_s390_size_dynamic_sections if no dynamic sections will be
1305 created (we're only linking static objects). */
1306
1307 static void
elf_s390_adjust_gotplt(struct elf_s390_link_hash_entry * h)1308 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1309 {
1310 if (h->elf.root.type == bfd_link_hash_warning)
1311 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1312
1313 if (h->gotplt_refcount <= 0)
1314 return;
1315
1316 /* We simply add the number of gotplt references to the number
1317 * of got references for this symbol. */
1318 h->elf.got.refcount += h->gotplt_refcount;
1319 h->gotplt_refcount = -1;
1320 }
1321
1322 /* Adjust a symbol defined by a dynamic object and referenced by a
1323 regular object. The current definition is in some section of the
1324 dynamic object, but we're not including those sections. We have to
1325 change the definition to something the rest of the link can
1326 understand. */
1327
1328 static bool
elf_s390_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1329 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1330 struct elf_link_hash_entry *h)
1331 {
1332 struct elf_s390_link_hash_table *htab;
1333 asection *s, *srel;
1334
1335 /* STT_GNU_IFUNC symbol must go through PLT. */
1336 if (s390_is_ifunc_symbol_p (h))
1337 {
1338 /* All local STT_GNU_IFUNC references must be treated as local
1339 calls via local PLT. */
1340 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1341 {
1342 bfd_size_type pc_count = 0, count = 0;
1343 struct elf_dyn_relocs **pp;
1344 struct elf_dyn_relocs *p;
1345
1346 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1347 {
1348 pc_count += p->pc_count;
1349 p->count -= p->pc_count;
1350 p->pc_count = 0;
1351 count += p->count;
1352 if (p->count == 0)
1353 *pp = p->next;
1354 else
1355 pp = &p->next;
1356 }
1357
1358 if (pc_count || count)
1359 {
1360 h->needs_plt = 1;
1361 h->non_got_ref = 1;
1362 if (h->plt.refcount <= 0)
1363 h->plt.refcount = 1;
1364 else
1365 h->plt.refcount += 1;
1366 }
1367 }
1368
1369 if (h->plt.refcount <= 0)
1370 {
1371 h->plt.offset = (bfd_vma) -1;
1372 h->needs_plt = 0;
1373 }
1374 return true;
1375 }
1376
1377 /* If this is a function, put it in the procedure linkage table. We
1378 will fill in the contents of the procedure linkage table later
1379 (although we could actually do it here). */
1380 if (h->type == STT_FUNC
1381 || h->needs_plt)
1382 {
1383 if (h->plt.refcount <= 0
1384 || SYMBOL_CALLS_LOCAL (info, h)
1385 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1386 {
1387 /* This case can occur if we saw a PLT32 reloc in an input
1388 file, but the symbol was never referred to by a dynamic
1389 object, or if all references were garbage collected. In
1390 such a case, we don't actually need to build a procedure
1391 linkage table, and we can just do a PC32 reloc instead. */
1392 h->plt.offset = (bfd_vma) -1;
1393 h->needs_plt = 0;
1394 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1395 }
1396
1397 return true;
1398 }
1399 else
1400 /* It's possible that we incorrectly decided a .plt reloc was
1401 needed for an R_390_PC32 reloc to a non-function sym in
1402 check_relocs. We can't decide accurately between function and
1403 non-function syms in check-relocs; Objects loaded later in
1404 the link may change h->type. So fix it now. */
1405 h->plt.offset = (bfd_vma) -1;
1406
1407 /* If this is a weak symbol, and there is a real definition, the
1408 processor independent code will have arranged for us to see the
1409 real definition first, and we can just use the same value. */
1410 if (h->is_weakalias)
1411 {
1412 struct elf_link_hash_entry *def = weakdef (h);
1413 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1414 h->root.u.def.section = def->root.u.def.section;
1415 h->root.u.def.value = def->root.u.def.value;
1416 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1417 h->non_got_ref = def->non_got_ref;
1418 return true;
1419 }
1420
1421 /* This is a reference to a symbol defined by a dynamic object which
1422 is not a function. */
1423
1424 /* If we are creating a shared library, we must presume that the
1425 only references to the symbol are via the global offset table.
1426 For such cases we need not do anything here; the relocations will
1427 be handled correctly by relocate_section. */
1428 if (bfd_link_pic (info))
1429 return true;
1430
1431 /* If there are no references to this symbol that do not use the
1432 GOT, we don't need to generate a copy reloc. */
1433 if (!h->non_got_ref)
1434 return true;
1435
1436 /* If -z nocopyreloc was given, we won't generate them either. */
1437 if (info->nocopyreloc)
1438 {
1439 h->non_got_ref = 0;
1440 return true;
1441 }
1442
1443 /* If we don't find any dynamic relocs in read-only sections, then
1444 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1445 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h))
1446 {
1447 h->non_got_ref = 0;
1448 return true;
1449 }
1450
1451 /* We must allocate the symbol in our .dynbss section, which will
1452 become part of the .bss section of the executable. There will be
1453 an entry for this symbol in the .dynsym section. The dynamic
1454 object will contain position independent code, so all references
1455 from the dynamic object to this symbol will go through the global
1456 offset table. The dynamic linker will use the .dynsym entry to
1457 determine the address it must put in the global offset table, so
1458 both the dynamic object and the regular object will refer to the
1459 same memory location for the variable. */
1460
1461 htab = elf_s390_hash_table (info);
1462 if (htab == NULL)
1463 return false;
1464
1465 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1466 copy the initial value out of the dynamic object and into the
1467 runtime process image. */
1468 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1469 {
1470 s = htab->elf.sdynrelro;
1471 srel = htab->elf.sreldynrelro;
1472 }
1473 else
1474 {
1475 s = htab->elf.sdynbss;
1476 srel = htab->elf.srelbss;
1477 }
1478 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1479 {
1480 srel->size += sizeof (Elf64_External_Rela);
1481 h->needs_copy = 1;
1482 }
1483
1484 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1485 }
1486
1487 /* Allocate space in .plt, .got and associated reloc sections for
1488 dynamic relocs. */
1489
1490 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1491 allocate_dynrelocs (struct elf_link_hash_entry *h,
1492 void * inf)
1493 {
1494 struct bfd_link_info *info;
1495 struct elf_s390_link_hash_table *htab;
1496 struct elf_dyn_relocs *p;
1497
1498 if (h->root.type == bfd_link_hash_indirect)
1499 return true;
1500
1501 info = (struct bfd_link_info *) inf;
1502 htab = elf_s390_hash_table (info);
1503 if (htab == NULL)
1504 return false;
1505
1506 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1507 here if it is defined and referenced in a non-shared object. */
1508 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1509 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1510 else if (htab->elf.dynamic_sections_created
1511 && h->plt.refcount > 0)
1512 {
1513 /* Make sure this symbol is output as a dynamic symbol.
1514 Undefined weak syms won't yet be marked as dynamic. */
1515 if (h->dynindx == -1
1516 && !h->forced_local)
1517 {
1518 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1519 return false;
1520 }
1521
1522 if (bfd_link_pic (info)
1523 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1524 {
1525 asection *s = htab->elf.splt;
1526
1527 /* If this is the first .plt entry, make room for the special
1528 first entry. */
1529 if (s->size == 0)
1530 s->size += PLT_FIRST_ENTRY_SIZE;
1531
1532 h->plt.offset = s->size;
1533
1534 /* If this symbol is not defined in a regular file, and we are
1535 not generating a shared library, then set the symbol to this
1536 location in the .plt. This is required to make function
1537 pointers compare as equal between the normal executable and
1538 the shared library. */
1539 if (! bfd_link_pic (info)
1540 && !h->def_regular)
1541 {
1542 h->root.u.def.section = s;
1543 h->root.u.def.value = h->plt.offset;
1544 }
1545
1546 /* Make room for this entry. */
1547 s->size += PLT_ENTRY_SIZE;
1548
1549 /* We also need to make an entry in the .got.plt section. */
1550 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1551
1552 /* We also need to make an entry in the .rela.plt section. */
1553 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1554 }
1555 else
1556 {
1557 h->plt.offset = (bfd_vma) -1;
1558 h->needs_plt = 0;
1559 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1560 }
1561 }
1562 else
1563 {
1564 h->plt.offset = (bfd_vma) -1;
1565 h->needs_plt = 0;
1566 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1567 }
1568
1569 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1570 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1571 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1572 we can save the dynamic TLS relocation. */
1573 if (h->got.refcount > 0
1574 && !bfd_link_dll (info)
1575 && h->dynindx == -1
1576 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1577 {
1578 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1579 /* For the GOTIE access without a literal pool entry the offset has
1580 to be stored somewhere. The immediate value in the instruction
1581 is not bit enough so the value is stored in the got. */
1582 {
1583 h->got.offset = htab->elf.sgot->size;
1584 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1585 }
1586 else
1587 h->got.offset = (bfd_vma) -1;
1588 }
1589 else if (h->got.refcount > 0)
1590 {
1591 asection *s;
1592 bool dyn;
1593 int tls_type = elf_s390_hash_entry(h)->tls_type;
1594
1595 /* Make sure this symbol is output as a dynamic symbol.
1596 Undefined weak syms won't yet be marked as dynamic. */
1597 if (h->dynindx == -1
1598 && !h->forced_local)
1599 {
1600 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1601 return false;
1602 }
1603
1604 s = htab->elf.sgot;
1605 h->got.offset = s->size;
1606 s->size += GOT_ENTRY_SIZE;
1607 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1608 if (tls_type == GOT_TLS_GD)
1609 s->size += GOT_ENTRY_SIZE;
1610 dyn = htab->elf.dynamic_sections_created;
1611 /* R_390_TLS_IE64 needs one dynamic relocation,
1612 R_390_TLS_GD64 needs one if local symbol and two if global. */
1613 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1614 || tls_type >= GOT_TLS_IE)
1615 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1616 else if (tls_type == GOT_TLS_GD)
1617 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1618 else if (!UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)
1619 && (bfd_link_pic (info)
1620 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1621 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1622 }
1623 else
1624 h->got.offset = (bfd_vma) -1;
1625
1626 if (h->dyn_relocs == NULL)
1627 return true;
1628
1629 /* In the shared -Bsymbolic case, discard space allocated for
1630 dynamic pc-relative relocs against symbols which turn out to be
1631 defined in regular objects. For the normal shared case, discard
1632 space for pc-relative relocs that have become local due to symbol
1633 visibility changes. */
1634
1635 if (bfd_link_pic (info))
1636 {
1637 if (SYMBOL_CALLS_LOCAL (info, h))
1638 {
1639 struct elf_dyn_relocs **pp;
1640
1641 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1642 {
1643 p->count -= p->pc_count;
1644 p->pc_count = 0;
1645 if (p->count == 0)
1646 *pp = p->next;
1647 else
1648 pp = &p->next;
1649 }
1650 }
1651
1652 /* Also discard relocs on undefined weak syms with non-default
1653 visibility. */
1654 if (h->dyn_relocs != NULL
1655 && h->root.type == bfd_link_hash_undefweak)
1656 {
1657 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1658 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1659 h->dyn_relocs = NULL;
1660
1661 /* Make sure undefined weak symbols are output as a dynamic
1662 symbol in PIEs. */
1663 else if (h->dynindx == -1
1664 && !h->forced_local)
1665 {
1666 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1667 return false;
1668 }
1669 }
1670 }
1671 else if (ELIMINATE_COPY_RELOCS)
1672 {
1673 /* For the non-shared case, discard space for relocs against
1674 symbols which turn out to need copy relocs or are not
1675 dynamic. */
1676
1677 if (!h->non_got_ref
1678 && ((h->def_dynamic
1679 && !h->def_regular)
1680 || (htab->elf.dynamic_sections_created
1681 && (h->root.type == bfd_link_hash_undefweak
1682 || h->root.type == bfd_link_hash_undefined))))
1683 {
1684 /* Make sure this symbol is output as a dynamic symbol.
1685 Undefined weak syms won't yet be marked as dynamic. */
1686 if (h->dynindx == -1
1687 && !h->forced_local)
1688 {
1689 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1690 return false;
1691 }
1692
1693 /* If that succeeded, we know we'll be keeping all the
1694 relocs. */
1695 if (h->dynindx != -1)
1696 goto keep;
1697 }
1698
1699 h->dyn_relocs = NULL;
1700
1701 keep: ;
1702 }
1703
1704 /* Finally, allocate space. */
1705 for (p = h->dyn_relocs; p != NULL; p = p->next)
1706 {
1707 asection *sreloc = elf_section_data (p->sec)->sreloc;
1708 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1709 }
1710
1711 return true;
1712 }
1713
1714 /* Set the sizes of the dynamic sections. */
1715
1716 static bool
elf_s390_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)1717 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1718 struct bfd_link_info *info)
1719 {
1720 struct elf_s390_link_hash_table *htab;
1721 bfd *dynobj;
1722 asection *s;
1723 bool relocs;
1724 bfd *ibfd;
1725
1726 htab = elf_s390_hash_table (info);
1727 if (htab == NULL)
1728 return false;
1729
1730 dynobj = htab->elf.dynobj;
1731 if (dynobj == NULL)
1732 abort ();
1733
1734 if (htab->elf.dynamic_sections_created)
1735 {
1736 /* Set the contents of the .interp section to the interpreter. */
1737 if (bfd_link_executable (info) && !info->nointerp)
1738 {
1739 s = bfd_get_linker_section (dynobj, ".interp");
1740 if (s == NULL)
1741 abort ();
1742 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1743 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1744 }
1745 }
1746
1747 if (htab->elf.sgot && s390_gotplt_after_got_p (info))
1748 {
1749 /* _bfd_elf_create_got_section adds the got header size always
1750 to .got.plt but we need it in .got if this section comes
1751 first. */
1752 htab->elf.sgot->size += 3 * GOT_ENTRY_SIZE;
1753 htab->elf.sgotplt->size -= 3 * GOT_ENTRY_SIZE;
1754
1755 /* Make the _GLOBAL_OFFSET_TABLE_ symbol point to the .got
1756 instead of .got.plt. */
1757 htab->elf.hgot->root.u.def.section = htab->elf.sgot;
1758 htab->elf.hgot->root.u.def.value = 0;
1759 }
1760
1761 /* Set up .got offsets for local syms, and space for local dynamic
1762 relocs. */
1763 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1764 {
1765 bfd_signed_vma *local_got;
1766 bfd_signed_vma *end_local_got;
1767 char *local_tls_type;
1768 bfd_size_type locsymcount;
1769 Elf_Internal_Shdr *symtab_hdr;
1770 asection *srela;
1771 struct plt_entry *local_plt;
1772 unsigned int i;
1773
1774 if (! is_s390_elf (ibfd))
1775 continue;
1776
1777 for (s = ibfd->sections; s != NULL; s = s->next)
1778 {
1779 struct elf_dyn_relocs *p;
1780
1781 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1782 {
1783 if (!bfd_is_abs_section (p->sec)
1784 && bfd_is_abs_section (p->sec->output_section))
1785 {
1786 /* Input section has been discarded, either because
1787 it is a copy of a linkonce section or due to
1788 linker script /DISCARD/, so we'll be discarding
1789 the relocs too. */
1790 }
1791 else if (p->count != 0)
1792 {
1793 srela = elf_section_data (p->sec)->sreloc;
1794 srela->size += p->count * sizeof (Elf64_External_Rela);
1795 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1796 info->flags |= DF_TEXTREL;
1797 }
1798 }
1799 }
1800
1801 local_got = elf_local_got_refcounts (ibfd);
1802 if (!local_got)
1803 continue;
1804
1805 symtab_hdr = &elf_symtab_hdr (ibfd);
1806 locsymcount = symtab_hdr->sh_info;
1807 end_local_got = local_got + locsymcount;
1808 local_tls_type = elf_s390_local_got_tls_type (ibfd);
1809 s = htab->elf.sgot;
1810 srela = htab->elf.srelgot;
1811 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1812 {
1813 if (*local_got > 0)
1814 {
1815 *local_got = s->size;
1816 s->size += GOT_ENTRY_SIZE;
1817 if (*local_tls_type == GOT_TLS_GD)
1818 s->size += GOT_ENTRY_SIZE;
1819 if (bfd_link_pic (info))
1820 srela->size += sizeof (Elf64_External_Rela);
1821 }
1822 else
1823 *local_got = (bfd_vma) -1;
1824 }
1825
1826 local_plt = elf_s390_local_plt (ibfd);
1827 for (i = 0; i < symtab_hdr->sh_info; i++)
1828 {
1829 if (local_plt[i].plt.refcount > 0)
1830 {
1831 local_plt[i].plt.offset = htab->elf.iplt->size;
1832 htab->elf.iplt->size += PLT_ENTRY_SIZE;
1833 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
1834 htab->elf.irelplt->size += sizeof (Elf64_External_Rela);
1835 }
1836 else
1837 local_plt[i].plt.offset = (bfd_vma) -1;
1838 }
1839 }
1840
1841 if (htab->tls_ldm_got.refcount > 0)
1842 {
1843 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
1844 relocs. */
1845 htab->tls_ldm_got.offset = htab->elf.sgot->size;
1846 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
1847 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1848 }
1849 else
1850 htab->tls_ldm_got.offset = -1;
1851
1852 /* Allocate global sym .plt and .got entries, and space for global
1853 sym dynamic relocs. */
1854 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
1855
1856 /* We now have determined the sizes of the various dynamic sections.
1857 Allocate memory for them. */
1858 relocs = false;
1859 for (s = dynobj->sections; s != NULL; s = s->next)
1860 {
1861 if ((s->flags & SEC_LINKER_CREATED) == 0)
1862 continue;
1863
1864 if (s == htab->elf.splt
1865 || s == htab->elf.sgot
1866 || s == htab->elf.sgotplt
1867 || s == htab->elf.sdynbss
1868 || s == htab->elf.sdynrelro
1869 || s == htab->elf.iplt
1870 || s == htab->elf.igotplt
1871 || s == htab->irelifunc)
1872 {
1873 /* Strip this section if we don't need it; see the
1874 comment below. */
1875 }
1876 else if (startswith (bfd_section_name (s), ".rela"))
1877 {
1878 if (s->size != 0 && s != htab->elf.srelplt)
1879 {
1880 relocs = true;
1881 if (s == htab->elf.irelplt)
1882 {
1883 /* In static-pie case, there are IRELATIVE-relocs in
1884 .rela.iplt (htab->irelplt), which will later be grouped
1885 to .rela.plt. On s390, the IRELATIVE relocations are
1886 always located in .rela.iplt - even for non-static case.
1887 Ensure that DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ is added
1888 to the dynamic section even if htab->srelplt->size == 0.
1889 See _bfd_elf_add_dynamic_tags in bfd/elflink.c. */
1890 htab->elf.dt_jmprel_required = true;
1891 }
1892 }
1893
1894 /* We use the reloc_count field as a counter if we need
1895 to copy relocs into the output file. */
1896 s->reloc_count = 0;
1897 }
1898 else
1899 {
1900 /* It's not one of our sections, so don't allocate space. */
1901 continue;
1902 }
1903
1904 if (s->size == 0)
1905 {
1906 /* If we don't need this section, strip it from the
1907 output file. This is to handle .rela.bss and
1908 .rela.plt. We must create it in
1909 create_dynamic_sections, because it must be created
1910 before the linker maps input sections to output
1911 sections. The linker does that before
1912 adjust_dynamic_symbol is called, and it is that
1913 function which decides whether anything needs to go
1914 into these sections. */
1915
1916 s->flags |= SEC_EXCLUDE;
1917 continue;
1918 }
1919
1920 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1921 continue;
1922
1923 /* Allocate memory for the section contents. We use bfd_zalloc
1924 here in case unused entries are not reclaimed before the
1925 section's contents are written out. This should not happen,
1926 but this way if it does, we get a R_390_NONE reloc instead
1927 of garbage. */
1928 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1929 if (s->contents == NULL)
1930 return false;
1931 }
1932
1933 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1934 }
1935
1936 /* Return the base VMA address which should be subtracted from real addresses
1937 when resolving @dtpoff relocation.
1938 This is PT_TLS segment p_vaddr. */
1939
1940 static bfd_vma
dtpoff_base(struct bfd_link_info * info)1941 dtpoff_base (struct bfd_link_info *info)
1942 {
1943 /* If tls_sec is NULL, we should have signalled an error already. */
1944 if (elf_hash_table (info)->tls_sec == NULL)
1945 return 0;
1946 return elf_hash_table (info)->tls_sec->vma;
1947 }
1948
1949 /* Return the relocation value for @tpoff relocation
1950 if STT_TLS virtual address is ADDRESS. */
1951
1952 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)1953 tpoff (struct bfd_link_info *info, bfd_vma address)
1954 {
1955 struct elf_link_hash_table *htab = elf_hash_table (info);
1956
1957 /* If tls_sec is NULL, we should have signalled an error already. */
1958 if (htab->tls_sec == NULL)
1959 return 0;
1960 return htab->tls_size + htab->tls_sec->vma - address;
1961 }
1962
1963 /* Complain if TLS instruction relocation is against an invalid
1964 instruction. */
1965
1966 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)1967 invalid_tls_insn (bfd *input_bfd,
1968 asection *input_section,
1969 Elf_Internal_Rela *rel)
1970 {
1971 reloc_howto_type *howto;
1972
1973 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
1974 _bfd_error_handler
1975 /* xgettext:c-format */
1976 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
1977 input_bfd,
1978 input_section,
1979 (uint64_t) rel->r_offset,
1980 howto->name);
1981 bfd_set_error (bfd_error_bad_value);
1982 }
1983
1984 /* Relocate a 390 ELF section. */
1985
1986 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)1987 elf_s390_relocate_section (bfd *output_bfd,
1988 struct bfd_link_info *info,
1989 bfd *input_bfd,
1990 asection *input_section,
1991 bfd_byte *contents,
1992 Elf_Internal_Rela *relocs,
1993 Elf_Internal_Sym *local_syms,
1994 asection **local_sections)
1995 {
1996 struct elf_s390_link_hash_table *htab;
1997 Elf_Internal_Shdr *symtab_hdr;
1998 struct elf_link_hash_entry **sym_hashes;
1999 bfd_vma *local_got_offsets;
2000 Elf_Internal_Rela *rel;
2001 Elf_Internal_Rela *relend;
2002
2003 if (!is_s390_elf (input_bfd))
2004 {
2005 bfd_set_error (bfd_error_wrong_format);
2006 return false;
2007 }
2008
2009 htab = elf_s390_hash_table (info);
2010 if (htab == NULL)
2011 return false;
2012
2013 symtab_hdr = &elf_symtab_hdr (input_bfd);
2014 sym_hashes = elf_sym_hashes (input_bfd);
2015 local_got_offsets = elf_local_got_offsets (input_bfd);
2016
2017 rel = relocs;
2018 relend = relocs + input_section->reloc_count;
2019 for (; rel < relend; rel++)
2020 {
2021 unsigned int r_type;
2022 reloc_howto_type *howto;
2023 unsigned long r_symndx;
2024 struct elf_link_hash_entry *h;
2025 Elf_Internal_Sym *sym;
2026 asection *sec;
2027 bfd_vma off;
2028 bfd_vma relocation;
2029 bool unresolved_reloc;
2030 bfd_reloc_status_type r;
2031 int tls_type;
2032 bool resolved_to_zero;
2033
2034 r_type = ELF64_R_TYPE (rel->r_info);
2035 if (r_type == (int) R_390_GNU_VTINHERIT
2036 || r_type == (int) R_390_GNU_VTENTRY)
2037 continue;
2038 if (r_type >= (int) R_390_max)
2039 {
2040 bfd_set_error (bfd_error_bad_value);
2041 return false;
2042 }
2043
2044 howto = elf_howto_table + r_type;
2045 r_symndx = ELF64_R_SYM (rel->r_info);
2046
2047 h = NULL;
2048 sym = NULL;
2049 sec = NULL;
2050 unresolved_reloc = false;
2051 if (r_symndx < symtab_hdr->sh_info)
2052 {
2053 sym = local_syms + r_symndx;
2054 sec = local_sections[r_symndx];
2055
2056 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2057 {
2058 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2059 if (local_plt == NULL)
2060 return false;
2061
2062 /* Address of the PLT slot. */
2063 relocation = (htab->elf.iplt->output_section->vma
2064 + htab->elf.iplt->output_offset
2065 + local_plt[r_symndx].plt.offset);
2066
2067 switch (r_type)
2068 {
2069 case R_390_PLTOFF16:
2070 case R_390_PLTOFF32:
2071 case R_390_PLTOFF64:
2072 relocation -= s390_got_pointer (info);
2073 break;
2074 case R_390_GOTPLT12:
2075 case R_390_GOTPLT16:
2076 case R_390_GOTPLT20:
2077 case R_390_GOTPLT32:
2078 case R_390_GOTPLT64:
2079 case R_390_GOTPLTENT:
2080 case R_390_GOT12:
2081 case R_390_GOT16:
2082 case R_390_GOT20:
2083 case R_390_GOT32:
2084 case R_390_GOT64:
2085 case R_390_GOTENT:
2086 {
2087 /* Write the PLT slot address into the GOT slot. */
2088 bfd_put_64 (output_bfd, relocation,
2089 htab->elf.sgot->contents +
2090 local_got_offsets[r_symndx]);
2091 relocation = (local_got_offsets[r_symndx] +
2092 s390_got_offset (info));
2093
2094 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2095 relocation += s390_got_pointer (info);
2096 break;
2097 }
2098 default:
2099 break;
2100 }
2101 /* The output section is needed later in
2102 finish_dynamic_section when creating the dynamic
2103 relocation. */
2104 local_plt[r_symndx].sec = sec;
2105 goto do_relocation;
2106 }
2107 else
2108 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2109 }
2110 else
2111 {
2112 bool warned ATTRIBUTE_UNUSED;
2113 bool ignored ATTRIBUTE_UNUSED;
2114
2115 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2116 r_symndx, symtab_hdr, sym_hashes,
2117 h, sec, relocation,
2118 unresolved_reloc, warned, ignored);
2119 }
2120
2121 if (sec != NULL && discarded_section (sec))
2122 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2123 rel, 1, relend, howto, 0, contents);
2124
2125 if (bfd_link_relocatable (info))
2126 continue;
2127
2128 resolved_to_zero = (h != NULL
2129 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
2130
2131 switch (r_type)
2132 {
2133 case R_390_GOTPLT12:
2134 case R_390_GOTPLT16:
2135 case R_390_GOTPLT20:
2136 case R_390_GOTPLT32:
2137 case R_390_GOTPLT64:
2138 case R_390_GOTPLTENT:
2139 /* There are three cases for a GOTPLT relocation. 1) The
2140 relocation is against the jump slot entry of a plt that
2141 will get emitted to the output file. 2) The relocation
2142 is against the jump slot of a plt entry that has been
2143 removed. elf_s390_adjust_gotplt has created a GOT entry
2144 as replacement. 3) The relocation is against a local symbol.
2145 Cases 2) and 3) are the same as the GOT relocation code
2146 so we just have to test for case 1 and fall through for
2147 the other two. */
2148 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2149 {
2150 bfd_vma plt_index;
2151
2152 if (s390_is_ifunc_symbol_p (h))
2153 {
2154 /* Entry indices of .iplt and .igot.plt match
2155 1:1. No magic PLT first entry here. */
2156 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2157 relocation = (plt_index * GOT_ENTRY_SIZE
2158 + s390_gotplt_offset (info)
2159 + htab->elf.igotplt->output_offset);
2160 }
2161 else
2162 {
2163 plt_index = ((h->plt.offset - PLT_FIRST_ENTRY_SIZE)
2164 / PLT_ENTRY_SIZE);
2165
2166 relocation = (plt_index * GOT_ENTRY_SIZE
2167 + s390_gotplt_offset (info));
2168 }
2169 if (r_type == R_390_GOTPLTENT)
2170 relocation += s390_got_pointer (info);
2171 unresolved_reloc = false;
2172 break;
2173 }
2174 /* Fall through. */
2175
2176 case R_390_GOT12:
2177 case R_390_GOT16:
2178 case R_390_GOT20:
2179 case R_390_GOT32:
2180 case R_390_GOT64:
2181 case R_390_GOTENT:
2182 /* Relocation is to the entry for this symbol in the global
2183 offset table. */
2184 if (htab->elf.sgot == NULL)
2185 abort ();
2186
2187 if (h != NULL)
2188 {
2189 bool dyn;
2190
2191 off = h->got.offset;
2192 dyn = htab->elf.dynamic_sections_created;
2193
2194 if (s390_is_ifunc_symbol_p (h))
2195 {
2196 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2197 if (off == (bfd_vma)-1)
2198 {
2199 /* No explicit GOT usage so redirect to the
2200 got.iplt slot. */
2201 relocation = (s390_gotplt_offset (info)
2202 + htab->elf.igotplt->output_offset
2203 + (h->plt.offset / PLT_ENTRY_SIZE
2204 * GOT_ENTRY_SIZE));
2205
2206 /* For @GOTENT the relocation is against the offset between
2207 the instruction and the symbols entry in the GOT and not
2208 between the start of the GOT and the symbols entry. We
2209 add the vma of the GOT to get the correct value. */
2210 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2211 relocation += s390_got_pointer (info);
2212
2213 break;
2214 }
2215 else
2216 {
2217 /* Explicit GOT slots must contain the address
2218 of the PLT slot. This will be handled in
2219 finish_dynamic_symbol. */
2220 }
2221 }
2222 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2223 bfd_link_pic (info),
2224 h)
2225 || (bfd_link_pic (info)
2226 && SYMBOL_REFERENCES_LOCAL (info, h))
2227 || resolved_to_zero)
2228 {
2229 Elf_Internal_Sym *isym;
2230 asection *sym_sec;
2231
2232 /* This is actually a static link, or it is a
2233 -Bsymbolic link and the symbol is defined
2234 locally, or the symbol was forced to be local
2235 because of a version file. We must initialize
2236 this entry in the global offset table. Since the
2237 offset must always be a multiple of 2, we use the
2238 least significant bit to record whether we have
2239 initialized it already.
2240
2241 When doing a dynamic link, we create a .rel.got
2242 relocation entry to initialize the value. This
2243 is done in the finish_dynamic_symbol routine. */
2244 if ((off & 1) != 0)
2245 off &= ~1;
2246 else
2247 {
2248 bfd_put_64 (output_bfd, relocation,
2249 htab->elf.sgot->contents + off);
2250 h->got.offset |= 1;
2251 }
2252
2253 /* When turning a GOT slot dereference into a direct
2254 reference using larl we have to make sure that
2255 the symbol is 1. properly aligned and 2. it is no
2256 ABS symbol or will become one. */
2257 if ((h->def_regular
2258 && bfd_link_pic (info)
2259 && SYMBOL_REFERENCES_LOCAL (info, h))
2260 /* lgrl rx,sym@GOTENT -> larl rx, sym */
2261 && ((r_type == R_390_GOTENT
2262 && (bfd_get_16 (input_bfd,
2263 contents + rel->r_offset - 2)
2264 & 0xff0f) == 0xc408)
2265 /* lg rx, sym@GOT(r12) -> larl rx, sym */
2266 || (r_type == R_390_GOT20
2267 && (bfd_get_32 (input_bfd,
2268 contents + rel->r_offset - 2)
2269 & 0xff00f000) == 0xe300c000
2270 && bfd_get_8 (input_bfd,
2271 contents + rel->r_offset + 3) == 0x04))
2272 && (isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
2273 input_bfd, r_symndx))
2274 && isym->st_shndx != SHN_ABS
2275 && h != htab->elf.hdynamic
2276 && h != htab->elf.hgot
2277 && h != htab->elf.hplt
2278 && !(isym->st_value & 1)
2279 && (sym_sec = bfd_section_from_elf_index (input_bfd,
2280 isym->st_shndx))
2281 && sym_sec->alignment_power)
2282 {
2283 unsigned short new_insn =
2284 (0xc000 | (bfd_get_8 (input_bfd,
2285 contents + rel->r_offset - 1) & 0xf0));
2286 bfd_put_16 (output_bfd, new_insn,
2287 contents + rel->r_offset - 2);
2288 r_type = R_390_PC32DBL;
2289 rel->r_addend = 2;
2290 howto = elf_howto_table + r_type;
2291 relocation = h->root.u.def.value
2292 + h->root.u.def.section->output_section->vma
2293 + h->root.u.def.section->output_offset;
2294 goto do_relocation;
2295 }
2296 }
2297 else
2298 unresolved_reloc = false;
2299 }
2300 else
2301 {
2302 if (local_got_offsets == NULL)
2303 abort ();
2304
2305 off = local_got_offsets[r_symndx];
2306
2307 /* The offset must always be a multiple of 8. We use
2308 the least significant bit to record whether we have
2309 already generated the necessary reloc. */
2310 if ((off & 1) != 0)
2311 off &= ~1;
2312 else
2313 {
2314 bfd_put_64 (output_bfd, relocation,
2315 htab->elf.sgot->contents + off);
2316
2317 if (bfd_link_pic (info))
2318 {
2319 asection *s;
2320 Elf_Internal_Rela outrel;
2321 bfd_byte *loc;
2322
2323 s = htab->elf.srelgot;
2324 if (s == NULL)
2325 abort ();
2326
2327 outrel.r_offset = (htab->elf.sgot->output_section->vma
2328 + htab->elf.sgot->output_offset
2329 + off);
2330 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2331 outrel.r_addend = relocation;
2332 loc = s->contents;
2333 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2334 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2335 }
2336
2337 local_got_offsets[r_symndx] |= 1;
2338 }
2339 }
2340
2341 if (off >= (bfd_vma) -2)
2342 abort ();
2343
2344 relocation = s390_got_offset (info) + off;
2345
2346 /* For @GOTENT the relocation is against the offset between
2347 the instruction and the symbols entry in the GOT and not
2348 between the start of the GOT and the symbols entry. We
2349 add the vma of the GOT to get the correct value. */
2350 if ( r_type == R_390_GOTENT
2351 || r_type == R_390_GOTPLTENT)
2352 relocation += s390_got_pointer (info);
2353
2354 break;
2355
2356 case R_390_GOTOFF16:
2357 case R_390_GOTOFF32:
2358 case R_390_GOTOFF64:
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 - s390_got_pointer (info));
2371 goto do_relocation;
2372 }
2373
2374 relocation -= s390_got_pointer (info);
2375 break;
2376
2377 case R_390_GOTPC:
2378 case R_390_GOTPCDBL:
2379 /* Use global offset table as symbol value. */
2380 relocation = s390_got_pointer (info);
2381 unresolved_reloc = false;
2382 break;
2383
2384 case R_390_PLT12DBL:
2385 case R_390_PLT16DBL:
2386 case R_390_PLT24DBL:
2387 case R_390_PLT32:
2388 case R_390_PLT32DBL:
2389 case R_390_PLT64:
2390 /* Relocation is to the entry for this symbol in the
2391 procedure linkage table. */
2392
2393 /* Resolve a PLT32 reloc against a local symbol directly,
2394 without using the procedure linkage table. */
2395 if (h == NULL)
2396 break;
2397
2398 if (h->plt.offset == (bfd_vma) -1
2399 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2400 {
2401 /* We didn't make a PLT entry for this symbol. This
2402 happens when statically linking PIC code, or when
2403 using -Bsymbolic. */
2404 break;
2405 }
2406 if (s390_is_ifunc_symbol_p (h))
2407 relocation = (htab->elf.iplt->output_section->vma
2408 + htab->elf.iplt->output_offset
2409 + h->plt.offset);
2410 else
2411 relocation = (htab->elf.splt->output_section->vma
2412 + htab->elf.splt->output_offset
2413 + h->plt.offset);
2414 unresolved_reloc = false;
2415 break;
2416
2417 case R_390_PLTOFF16:
2418 case R_390_PLTOFF32:
2419 case R_390_PLTOFF64:
2420 /* Relocation is to the entry for this symbol in the
2421 procedure linkage table relative to the start of the GOT. */
2422
2423 /* For local symbols or if we didn't make a PLT entry for
2424 this symbol resolve the symbol directly. */
2425 if (h == NULL
2426 || h->plt.offset == (bfd_vma) -1
2427 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2428 {
2429 relocation -= s390_got_pointer (info);
2430 break;
2431 }
2432
2433 if (s390_is_ifunc_symbol_p (h))
2434 relocation = (htab->elf.iplt->output_section->vma
2435 + htab->elf.iplt->output_offset
2436 + h->plt.offset
2437 - s390_got_pointer (info));
2438 else
2439 relocation = (htab->elf.splt->output_section->vma
2440 + htab->elf.splt->output_offset
2441 + h->plt.offset
2442 - s390_got_pointer (info));
2443 unresolved_reloc = false;
2444 break;
2445
2446 case R_390_PC16:
2447 case R_390_PC12DBL:
2448 case R_390_PC16DBL:
2449 case R_390_PC24DBL:
2450 case R_390_PC32:
2451 case R_390_PC32DBL:
2452 case R_390_PC64:
2453 if (h != NULL
2454 && bfd_link_pie (info)
2455 && !h->def_regular)
2456 {
2457 _bfd_error_handler (_("%pB: `%s' non-PLT reloc for symbol defined "
2458 "in shared library and accessed "
2459 "from executable "
2460 "(rebuild file with -fPIC ?)"),
2461 input_bfd, h->root.root.string);
2462 bfd_set_error (bfd_error_bad_value);
2463 return false;
2464 }
2465 /* The target of these relocs are instruction operands
2466 residing in read-only sections. We cannot emit a runtime
2467 reloc for it. */
2468 if (h != NULL
2469 && s390_is_ifunc_symbol_p (h)
2470 && h->def_regular
2471 && bfd_link_pic (info))
2472 {
2473 relocation = (htab->elf.iplt->output_section->vma
2474 + htab->elf.iplt->output_offset
2475 + h->plt.offset);
2476 goto do_relocation;
2477 }
2478 /* Fall through. */
2479
2480 case R_390_8:
2481 case R_390_16:
2482 case R_390_32:
2483 case R_390_64:
2484
2485 if ((input_section->flags & SEC_ALLOC) == 0)
2486 break;
2487
2488 if (h != NULL
2489 && s390_is_ifunc_symbol_p (h)
2490 && h->def_regular)
2491 {
2492 if (!bfd_link_pic (info))
2493 {
2494 /* For a non-shared object the symbol will not
2495 change. Hence we can write the address of the
2496 target IPLT slot now. */
2497 relocation = (htab->elf.iplt->output_section->vma
2498 + htab->elf.iplt->output_offset
2499 + h ->plt.offset);
2500 goto do_relocation;
2501 }
2502 else
2503 {
2504 /* For shared objects a runtime relocation is needed. */
2505
2506 Elf_Internal_Rela outrel;
2507 asection *sreloc;
2508
2509 /* Need a dynamic relocation to get the real function
2510 address. */
2511 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2512 info,
2513 input_section,
2514 rel->r_offset);
2515 if (outrel.r_offset == (bfd_vma) -1
2516 || outrel.r_offset == (bfd_vma) -2)
2517 abort ();
2518
2519 outrel.r_offset += (input_section->output_section->vma
2520 + input_section->output_offset);
2521
2522 if (h->dynindx == -1
2523 || h->forced_local
2524 || bfd_link_executable (info))
2525 {
2526 /* This symbol is resolved locally. */
2527 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
2528 outrel.r_addend = (h->root.u.def.value
2529 + h->root.u.def.section->output_section->vma
2530 + h->root.u.def.section->output_offset);
2531 }
2532 else
2533 {
2534 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2535 outrel.r_addend = 0;
2536 }
2537
2538 sreloc = htab->elf.irelifunc;
2539 elf_append_rela (output_bfd, sreloc, &outrel);
2540
2541 /* If this reloc is against an external symbol, we
2542 do not want to fiddle with the addend. Otherwise,
2543 we need to include the symbol value so that it
2544 becomes an addend for the dynamic reloc. For an
2545 internal symbol, we have updated addend. */
2546 continue;
2547 }
2548 }
2549
2550 if ((bfd_link_pic (info)
2551 && (h == NULL
2552 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2553 && !resolved_to_zero)
2554 || h->root.type != bfd_link_hash_undefweak)
2555 && ((r_type != R_390_PC16
2556 && r_type != R_390_PC12DBL
2557 && r_type != R_390_PC16DBL
2558 && r_type != R_390_PC24DBL
2559 && r_type != R_390_PC32
2560 && r_type != R_390_PC32DBL
2561 && r_type != R_390_PC64)
2562 || !SYMBOL_CALLS_LOCAL (info, h)))
2563 || (ELIMINATE_COPY_RELOCS
2564 && !bfd_link_pic (info)
2565 && h != NULL
2566 && h->dynindx != -1
2567 && !h->non_got_ref
2568 && ((h->def_dynamic
2569 && !h->def_regular)
2570 || h->root.type == bfd_link_hash_undefweak
2571 || h->root.type == bfd_link_hash_undefined)))
2572 {
2573 Elf_Internal_Rela outrel;
2574 bool skip, relocate;
2575 asection *sreloc;
2576 bfd_byte *loc;
2577
2578 /* When generating a shared object, these relocations
2579 are copied into the output file to be resolved at run
2580 time. */
2581 skip = false;
2582 relocate = false;
2583
2584 outrel.r_offset =
2585 _bfd_elf_section_offset (output_bfd, info, input_section,
2586 rel->r_offset);
2587 if (outrel.r_offset == (bfd_vma) -1)
2588 skip = true;
2589 else if (outrel.r_offset == (bfd_vma) -2)
2590 skip = true, relocate = true;
2591
2592 outrel.r_offset += (input_section->output_section->vma
2593 + input_section->output_offset);
2594
2595 if (skip)
2596 memset (&outrel, 0, sizeof outrel);
2597 else if (h != NULL
2598 && h->dynindx != -1
2599 && (r_type == R_390_PC16
2600 || r_type == R_390_PC12DBL
2601 || r_type == R_390_PC16DBL
2602 || r_type == R_390_PC24DBL
2603 || r_type == R_390_PC32
2604 || r_type == R_390_PC32DBL
2605 || r_type == R_390_PC64
2606 || !bfd_link_pic (info)
2607 || !SYMBOLIC_BIND (info, h)
2608 || !h->def_regular))
2609 {
2610 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2611 outrel.r_addend = rel->r_addend;
2612 }
2613 else
2614 {
2615 /* This symbol is local, or marked to become local. */
2616 outrel.r_addend = relocation + rel->r_addend;
2617 if (r_type == R_390_64)
2618 {
2619 relocate = true;
2620 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2621 }
2622 else
2623 {
2624 long sindx;
2625
2626 if (bfd_is_abs_section (sec))
2627 sindx = 0;
2628 else if (sec == NULL || sec->owner == NULL)
2629 {
2630 bfd_set_error(bfd_error_bad_value);
2631 return false;
2632 }
2633 else
2634 {
2635 asection *osec;
2636
2637 osec = sec->output_section;
2638 sindx = elf_section_data (osec)->dynindx;
2639
2640 if (sindx == 0)
2641 {
2642 osec = htab->elf.text_index_section;
2643 sindx = elf_section_data (osec)->dynindx;
2644 }
2645 BFD_ASSERT (sindx != 0);
2646
2647 /* We are turning this relocation into one
2648 against a section symbol, so subtract out
2649 the output section's address but not the
2650 offset of the input section in the output
2651 section. */
2652 outrel.r_addend -= osec->vma;
2653 }
2654 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2655 }
2656 }
2657
2658 sreloc = elf_section_data (input_section)->sreloc;
2659 if (sreloc == NULL)
2660 abort ();
2661
2662 loc = sreloc->contents;
2663 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2664 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2665
2666 /* If this reloc is against an external symbol, we do
2667 not want to fiddle with the addend. Otherwise, we
2668 need to include the symbol value so that it becomes
2669 an addend for the dynamic reloc. */
2670 if (! relocate)
2671 continue;
2672 }
2673
2674 break;
2675
2676 /* Relocations for tls literal pool entries. */
2677 case R_390_TLS_IE64:
2678 if (bfd_link_dll (info))
2679 {
2680 Elf_Internal_Rela outrel;
2681 asection *sreloc;
2682 bfd_byte *loc;
2683
2684 outrel.r_offset = rel->r_offset
2685 + input_section->output_section->vma
2686 + input_section->output_offset;
2687 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2688 sreloc = elf_section_data (input_section)->sreloc;
2689 if (sreloc == NULL)
2690 abort ();
2691 loc = sreloc->contents;
2692 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2693 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2694 }
2695 /* Fall through. */
2696
2697 case R_390_TLS_GD64:
2698 case R_390_TLS_GOTIE64:
2699 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2700 tls_type = GOT_UNKNOWN;
2701 if (h == NULL && local_got_offsets)
2702 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2703 else if (h != NULL)
2704 {
2705 tls_type = elf_s390_hash_entry(h)->tls_type;
2706 if (!bfd_link_dll (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2707 r_type = R_390_TLS_LE64;
2708 }
2709 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2710 r_type = R_390_TLS_IE64;
2711
2712 if (r_type == R_390_TLS_LE64)
2713 {
2714 /* This relocation gets optimized away by the local exec
2715 access optimization. */
2716 BFD_ASSERT (! unresolved_reloc);
2717 bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2718 contents + rel->r_offset);
2719 continue;
2720 }
2721
2722 if (htab->elf.sgot == NULL)
2723 abort ();
2724
2725 if (h != NULL)
2726 off = h->got.offset;
2727 else
2728 {
2729 if (local_got_offsets == NULL)
2730 abort ();
2731
2732 off = local_got_offsets[r_symndx];
2733 }
2734
2735 emit_tls_relocs:
2736
2737 if ((off & 1) != 0)
2738 off &= ~1;
2739 else
2740 {
2741 Elf_Internal_Rela outrel;
2742 bfd_byte *loc;
2743 int dr_type, indx;
2744
2745 if (htab->elf.srelgot == NULL)
2746 abort ();
2747
2748 outrel.r_offset = (htab->elf.sgot->output_section->vma
2749 + htab->elf.sgot->output_offset + off);
2750
2751 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2752 if (r_type == R_390_TLS_GD64)
2753 dr_type = R_390_TLS_DTPMOD;
2754 else
2755 dr_type = R_390_TLS_TPOFF;
2756 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2757 outrel.r_addend = relocation - dtpoff_base (info);
2758 else
2759 outrel.r_addend = 0;
2760 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2761 loc = htab->elf.srelgot->contents;
2762 loc += htab->elf.srelgot->reloc_count++
2763 * sizeof (Elf64_External_Rela);
2764 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2765
2766 if (r_type == R_390_TLS_GD64)
2767 {
2768 if (indx == 0)
2769 {
2770 BFD_ASSERT (! unresolved_reloc);
2771 bfd_put_64 (output_bfd,
2772 relocation - dtpoff_base (info),
2773 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2774 }
2775 else
2776 {
2777 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2778 outrel.r_offset += GOT_ENTRY_SIZE;
2779 outrel.r_addend = 0;
2780 htab->elf.srelgot->reloc_count++;
2781 loc += sizeof (Elf64_External_Rela);
2782 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2783 }
2784 }
2785
2786 if (h != NULL)
2787 h->got.offset |= 1;
2788 else
2789 local_got_offsets[r_symndx] |= 1;
2790 }
2791
2792 if (off >= (bfd_vma) -2)
2793 abort ();
2794 if (r_type == ELF64_R_TYPE (rel->r_info))
2795 {
2796 relocation = htab->elf.sgot->output_offset + off;
2797 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2798 relocation += htab->elf.sgot->output_section->vma;
2799 unresolved_reloc = false;
2800 }
2801 else
2802 {
2803 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
2804 contents + rel->r_offset);
2805 continue;
2806 }
2807 break;
2808
2809 case R_390_TLS_GOTIE12:
2810 case R_390_TLS_GOTIE20:
2811 case R_390_TLS_IEENT:
2812 if (h == NULL)
2813 {
2814 if (local_got_offsets == NULL)
2815 abort();
2816 off = local_got_offsets[r_symndx];
2817 if (bfd_link_dll (info))
2818 goto emit_tls_relocs;
2819 }
2820 else
2821 {
2822 off = h->got.offset;
2823 tls_type = elf_s390_hash_entry(h)->tls_type;
2824 if (bfd_link_dll (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2825 goto emit_tls_relocs;
2826 }
2827
2828 if (htab->elf.sgot == NULL)
2829 abort ();
2830
2831 BFD_ASSERT (! unresolved_reloc);
2832 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2833 htab->elf.sgot->contents + off);
2834 relocation = htab->elf.sgot->output_offset + off;
2835 if (r_type == R_390_TLS_IEENT)
2836 relocation += htab->elf.sgot->output_section->vma;
2837 unresolved_reloc = false;
2838 break;
2839
2840 case R_390_TLS_LDM64:
2841 if (! bfd_link_dll (info))
2842 /* The literal pool entry this relocation refers to gets ignored
2843 by the optimized code of the local exec model. Do nothing
2844 and the value will turn out zero. */
2845 continue;
2846
2847 if (htab->elf.sgot == NULL)
2848 abort ();
2849
2850 off = htab->tls_ldm_got.offset;
2851 if (off & 1)
2852 off &= ~1;
2853 else
2854 {
2855 Elf_Internal_Rela outrel;
2856 bfd_byte *loc;
2857
2858 if (htab->elf.srelgot == NULL)
2859 abort ();
2860
2861 outrel.r_offset = (htab->elf.sgot->output_section->vma
2862 + htab->elf.sgot->output_offset + off);
2863
2864 bfd_put_64 (output_bfd, 0,
2865 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2866 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2867 outrel.r_addend = 0;
2868 loc = htab->elf.srelgot->contents;
2869 loc += htab->elf.srelgot->reloc_count++
2870 * sizeof (Elf64_External_Rela);
2871 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2872 htab->tls_ldm_got.offset |= 1;
2873 }
2874 relocation = htab->elf.sgot->output_offset + off;
2875 unresolved_reloc = false;
2876 break;
2877
2878 case R_390_TLS_LE64:
2879 if (bfd_link_dll (info))
2880 {
2881 /* Linking a shared library with non-fpic code requires
2882 a R_390_TLS_TPOFF relocation. */
2883 Elf_Internal_Rela outrel;
2884 asection *sreloc;
2885 bfd_byte *loc;
2886 int indx;
2887
2888 outrel.r_offset = rel->r_offset
2889 + input_section->output_section->vma
2890 + input_section->output_offset;
2891 if (h != NULL && h->dynindx != -1)
2892 indx = h->dynindx;
2893 else
2894 indx = 0;
2895 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2896 if (indx == 0)
2897 outrel.r_addend = relocation - dtpoff_base (info);
2898 else
2899 outrel.r_addend = 0;
2900 sreloc = elf_section_data (input_section)->sreloc;
2901 if (sreloc == NULL)
2902 abort ();
2903 loc = sreloc->contents;
2904 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2905 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2906 }
2907 else
2908 {
2909 BFD_ASSERT (! unresolved_reloc);
2910 bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2911 contents + rel->r_offset);
2912 }
2913 continue;
2914
2915 case R_390_TLS_LDO64:
2916 if (bfd_link_dll (info) || (input_section->flags & SEC_DEBUGGING))
2917 relocation -= dtpoff_base (info);
2918 else
2919 /* When converting LDO to LE, we must negate. */
2920 relocation = -tpoff (info, relocation);
2921 break;
2922
2923 /* Relocations for tls instructions. */
2924 case R_390_TLS_LOAD:
2925 case R_390_TLS_GDCALL:
2926 case R_390_TLS_LDCALL:
2927 tls_type = GOT_UNKNOWN;
2928 if (h == NULL && local_got_offsets)
2929 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2930 else if (h != NULL)
2931 tls_type = elf_s390_hash_entry(h)->tls_type;
2932
2933 if (tls_type == GOT_TLS_GD)
2934 continue;
2935
2936 if (r_type == R_390_TLS_LOAD)
2937 {
2938 if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1))
2939 {
2940 /* IE->LE transition. Four valid cases:
2941 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2942 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2943 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2944 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2945 unsigned int insn0, insn1, ry;
2946
2947 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2948 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2949 if (insn1 != 0x0004)
2950 {
2951 invalid_tls_insn (input_bfd, input_section, rel);
2952 return false;
2953 }
2954 if ((insn0 & 0xff00f000) == 0xe3000000)
2955 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2956 ry = (insn0 & 0x000f0000);
2957 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2958 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2959 ry = (insn0 & 0x0000f000) << 4;
2960 else if ((insn0 & 0xff00f000) == 0xe300c000)
2961 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2962 ry = (insn0 & 0x000f0000);
2963 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2964 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2965 ry = (insn0 & 0x0000f000) << 4;
2966 else
2967 {
2968 invalid_tls_insn (input_bfd, input_section, rel);
2969 return false;
2970 }
2971 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2972 insn1 = 0x000d;
2973 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2974 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2975 }
2976 }
2977 else if (r_type == R_390_TLS_GDCALL)
2978 {
2979 unsigned int insn0, insn1;
2980
2981 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2982 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2983 if ((insn0 & 0xffff0000) != 0xc0e50000)
2984 {
2985 invalid_tls_insn (input_bfd, input_section, rel);
2986 return false;
2987 }
2988 if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1))
2989 {
2990 /* GD->LE transition.
2991 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2992 insn0 = 0xc0040000;
2993 insn1 = 0x0000;
2994 }
2995 else
2996 {
2997 /* GD->IE transition.
2998 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2999 insn0 = 0xe322c000;
3000 insn1 = 0x0004;
3001 }
3002 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3003 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3004 }
3005 else if (r_type == R_390_TLS_LDCALL)
3006 {
3007 if (!bfd_link_dll (info))
3008 {
3009 unsigned int insn0, insn1;
3010
3011 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3012 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3013 if ((insn0 & 0xffff0000) != 0xc0e50000)
3014 {
3015 invalid_tls_insn (input_bfd, input_section, rel);
3016 return false;
3017 }
3018 /* LD->LE transition.
3019 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3020 insn0 = 0xc0040000;
3021 insn1 = 0x0000;
3022 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3023 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3024 }
3025 }
3026 continue;
3027
3028 default:
3029 break;
3030 }
3031
3032 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3033 because such sections are not SEC_ALLOC and thus ld.so will
3034 not process them. */
3035 if (unresolved_reloc
3036 && !((input_section->flags & SEC_DEBUGGING) != 0
3037 && h->def_dynamic)
3038 && _bfd_elf_section_offset (output_bfd, info, input_section,
3039 rel->r_offset) != (bfd_vma) -1)
3040 _bfd_error_handler
3041 /* xgettext:c-format */
3042 (_("%pB(%pA+%#" PRIx64 "): "
3043 "unresolvable %s relocation against symbol `%s'"),
3044 input_bfd,
3045 input_section,
3046 (uint64_t) rel->r_offset,
3047 howto->name,
3048 h->root.root.string);
3049
3050 do_relocation:
3051
3052 /* When applying a 24 bit reloc we need to start one byte
3053 earlier. Otherwise the 32 bit get/put bfd operations might
3054 access a byte after the actual section. */
3055 if (r_type == R_390_PC24DBL
3056 || r_type == R_390_PLT24DBL)
3057 rel->r_offset--;
3058
3059 /* Issue an error if the right shift implied by the relocation
3060 would drop bits from the symbol value. */
3061 if (howto->rightshift
3062 && (relocation & (((bfd_vma)1 << howto->rightshift) - 1)))
3063 {
3064 _bfd_error_handler
3065 /* xgettext:c-format */
3066 (_("%pB(%pA+%#" PRIx64 "): "
3067 "misaligned symbol `%s' (%#" PRIx64 ") for relocation %s"),
3068 input_bfd,
3069 input_section,
3070 (uint64_t) rel->r_offset,
3071 h->root.root.string,
3072 (uint64_t)relocation,
3073 howto->name);
3074 return false;
3075 }
3076
3077 if (r_type == R_390_20
3078 || r_type == R_390_GOT20
3079 || r_type == R_390_GOTPLT20
3080 || r_type == R_390_TLS_GOTIE20)
3081 {
3082 relocation += rel->r_addend;
3083 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3084 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3085 contents, rel->r_offset,
3086 relocation, 0);
3087 }
3088 else
3089 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3090 contents, rel->r_offset,
3091 relocation, rel->r_addend);
3092
3093 if (r != bfd_reloc_ok)
3094 {
3095 const char *name;
3096
3097 if (h != NULL)
3098 name = h->root.root.string;
3099 else
3100 {
3101 name = bfd_elf_string_from_elf_section (input_bfd,
3102 symtab_hdr->sh_link,
3103 sym->st_name);
3104 if (name == NULL)
3105 return false;
3106 if (*name == '\0')
3107 name = bfd_section_name (sec);
3108 }
3109
3110 if (r == bfd_reloc_overflow)
3111 (*info->callbacks->reloc_overflow)
3112 (info, (h ? &h->root : NULL), name, howto->name,
3113 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3114 else
3115 {
3116 _bfd_error_handler
3117 /* xgettext:c-format */
3118 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3119 input_bfd, input_section,
3120 (uint64_t) rel->r_offset, name, (int) r);
3121 return false;
3122 }
3123 }
3124 }
3125
3126 return true;
3127 }
3128
3129 /* Generate the PLT slots together with the dynamic relocations needed
3130 for IFUNC symbols. */
3131
3132 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 plt_offset,bfd_vma resolver_address)3133 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3134 struct bfd_link_info *info,
3135 struct elf_link_hash_entry *h,
3136 struct elf_s390_link_hash_table *htab,
3137 bfd_vma plt_offset,
3138 bfd_vma resolver_address)
3139 {
3140 bfd_vma plt_index;
3141 bfd_vma got_offset;
3142 Elf_Internal_Rela rela;
3143 bfd_byte *loc;
3144 asection *plt, *gotplt, *relplt;
3145
3146 if (htab->elf.iplt == NULL
3147 || htab->elf.igotplt == NULL
3148 || htab->elf.irelplt == NULL)
3149 abort ();
3150
3151 /* Index of the PLT slot within iplt section. */
3152 plt_index = plt_offset / PLT_ENTRY_SIZE;
3153 plt = htab->elf.iplt;
3154 /* Offset into the igot.plt section. */
3155 got_offset = plt_index * GOT_ENTRY_SIZE;
3156 gotplt = htab->elf.igotplt;
3157 relplt = htab->elf.irelplt;
3158
3159 /* Fill in the blueprint of a PLT. */
3160 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
3161 PLT_ENTRY_SIZE);
3162
3163 /* Fixup the relative address to the GOT entry */
3164 bfd_put_32 (output_bfd,
3165 (gotplt->output_section->vma +
3166 gotplt->output_offset + got_offset
3167 - (plt->output_section->vma +
3168 plt->output_offset +
3169 plt_offset))/2,
3170 plt->contents + plt_offset + 2);
3171 /* Fixup the relative branch to PLT 0 */
3172 bfd_put_32 (output_bfd, - (plt->output_offset +
3173 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3174 plt->contents + plt_offset + 24);
3175 /* Fixup offset into .rela.plt section. */
3176 bfd_put_32 (output_bfd, relplt->output_offset +
3177 plt_index * sizeof (Elf64_External_Rela),
3178 plt->contents + plt_offset + 28);
3179
3180 /* Fill in the entry in the global offset table.
3181 Points to instruction after GOT offset. */
3182 bfd_put_64 (output_bfd,
3183 (plt->output_section->vma
3184 + plt->output_offset
3185 + plt_offset
3186 + 14),
3187 gotplt->contents + got_offset);
3188
3189 /* Fill in the entry in the .rela.plt section. */
3190 rela.r_offset = (gotplt->output_section->vma
3191 + gotplt->output_offset
3192 + got_offset);
3193
3194 if (!h
3195 || h->dynindx == -1
3196 || ((bfd_link_executable (info)
3197 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3198 && h->def_regular))
3199 {
3200 /* The symbol can be locally resolved. */
3201 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
3202 rela.r_addend = resolver_address;
3203 }
3204 else
3205 {
3206 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3207 rela.r_addend = 0;
3208 }
3209
3210 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3211 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3212 }
3213
3214
3215 /* Finish up dynamic symbol handling. We set the contents of various
3216 dynamic sections here. */
3217
3218 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)3219 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3220 struct bfd_link_info *info,
3221 struct elf_link_hash_entry *h,
3222 Elf_Internal_Sym *sym)
3223 {
3224 struct elf_s390_link_hash_table *htab;
3225 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3226
3227 htab = elf_s390_hash_table (info);
3228 if (htab == NULL)
3229 return false;
3230
3231 if (h->plt.offset != (bfd_vma) -1)
3232 {
3233 bfd_vma plt_index;
3234 bfd_vma gotplt_offset;
3235 Elf_Internal_Rela rela;
3236 bfd_byte *loc;
3237
3238 /* This symbol has an entry in the procedure linkage table. Set
3239 it up. */
3240 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3241 {
3242 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3243 htab, h->plt.offset,
3244 eh->ifunc_resolver_address +
3245 eh->ifunc_resolver_section->output_offset +
3246 eh->ifunc_resolver_section->output_section->vma);
3247
3248 /* Do not return yet. Handling of explicit GOT slots of
3249 IFUNC symbols is below. */
3250 }
3251 else
3252 {
3253 if (h->dynindx == -1
3254 || htab->elf.splt == NULL
3255 || htab->elf.sgotplt == NULL
3256 || htab->elf.srelplt == NULL)
3257 abort ();
3258
3259 /* Calc. index no.
3260 Current offset - size first entry / entry size. */
3261 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3262
3263 /* The slots in the .got.plt correspond to the PLT slots in
3264 the same order. */
3265 gotplt_offset = plt_index * GOT_ENTRY_SIZE;
3266
3267 /* If .got.plt comes first it needs to contain the 3 header
3268 entries. */
3269 if (!s390_gotplt_after_got_p (info))
3270 gotplt_offset += 3 * GOT_ENTRY_SIZE;
3271
3272 /* Fill in the blueprint of a PLT. */
3273 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
3274 PLT_ENTRY_SIZE);
3275
3276 /* The first instruction in the PLT entry is a LARL loading
3277 the address of the GOT slot. We write the 4 byte
3278 immediate operand of the LARL instruction here. */
3279 bfd_put_32 (output_bfd,
3280 (htab->elf.sgotplt->output_section->vma +
3281 htab->elf.sgotplt->output_offset + gotplt_offset
3282 - (htab->elf.splt->output_section->vma +
3283 htab->elf.splt->output_offset +
3284 h->plt.offset))/2,
3285 htab->elf.splt->contents + h->plt.offset + 2);
3286 /* Fixup the relative branch to PLT 0 */
3287 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3288 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3289 htab->elf.splt->contents + h->plt.offset + 24);
3290 /* Fixup offset into .rela.plt section. */
3291 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3292 htab->elf.splt->contents + h->plt.offset + 28);
3293
3294 /* Fill in the entry in the global offset table.
3295 Points to instruction after GOT offset. */
3296 bfd_put_64 (output_bfd,
3297 (htab->elf.splt->output_section->vma
3298 + htab->elf.splt->output_offset
3299 + h->plt.offset
3300 + 14),
3301 htab->elf.sgotplt->contents + gotplt_offset);
3302
3303 /* Fill in the entry in the .rela.plt section. */
3304 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3305 + htab->elf.sgotplt->output_offset
3306 + gotplt_offset);
3307 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3308 rela.r_addend = 0;
3309 loc = htab->elf.srelplt->contents + plt_index *
3310 sizeof (Elf64_External_Rela);
3311 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3312
3313 if (!h->def_regular)
3314 {
3315 /* Mark the symbol as undefined, rather than as defined in
3316 the .plt section. Leave the value alone. This is a clue
3317 for the dynamic linker, to make function pointer
3318 comparisons work between an application and shared
3319 library. */
3320 sym->st_shndx = SHN_UNDEF;
3321 }
3322 }
3323 }
3324
3325 if (h->got.offset != (bfd_vma) -1
3326 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3327 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3328 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3329 {
3330 Elf_Internal_Rela rela;
3331 bfd_byte *loc;
3332
3333 /* This symbol has an entry in the global offset table. Set it
3334 up. */
3335 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3336 abort ();
3337
3338 rela.r_offset = (htab->elf.sgot->output_section->vma
3339 + htab->elf.sgot->output_offset
3340 + (h->got.offset &~ (bfd_vma) 1));
3341
3342 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3343 {
3344 if (bfd_link_pic (info))
3345 {
3346 /* An explicit GOT slot usage needs GLOB_DAT. If the
3347 symbol references local the implicit got.iplt slot
3348 will be used and the IRELATIVE reloc has been created
3349 above. */
3350 goto do_glob_dat;
3351 }
3352 else
3353 {
3354 /* For non-shared objects explicit GOT slots must be
3355 filled with the PLT slot address for pointer
3356 equality reasons. */
3357 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
3358 + htab->elf.iplt->output_offset
3359 + h->plt.offset),
3360 htab->elf.sgot->contents + h->got.offset);
3361 return true;
3362 }
3363 }
3364 else if (bfd_link_pic (info)
3365 && SYMBOL_REFERENCES_LOCAL (info, h))
3366 {
3367 if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
3368 return true;
3369
3370 /* If this is a static link, or it is a -Bsymbolic link and
3371 the symbol is defined locally or was forced to be local
3372 because of a version file, we just want to emit a
3373 RELATIVE reloc. The entry in the global offset table
3374 will already have been initialized in the
3375 relocate_section function. */
3376 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
3377 return false;
3378 BFD_ASSERT((h->got.offset & 1) != 0);
3379 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3380 rela.r_addend = (h->root.u.def.value
3381 + h->root.u.def.section->output_section->vma
3382 + h->root.u.def.section->output_offset);
3383 }
3384 else
3385 {
3386 BFD_ASSERT((h->got.offset & 1) == 0);
3387 do_glob_dat:
3388 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3389 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3390 rela.r_addend = 0;
3391 }
3392
3393 loc = htab->elf.srelgot->contents;
3394 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3395 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3396 }
3397
3398 if (h->needs_copy)
3399 {
3400 Elf_Internal_Rela rela;
3401 asection *s;
3402 bfd_byte *loc;
3403
3404 /* This symbols needs a copy reloc. Set it up. */
3405
3406 if (h->dynindx == -1
3407 || (h->root.type != bfd_link_hash_defined
3408 && h->root.type != bfd_link_hash_defweak)
3409 || htab->elf.srelbss == NULL)
3410 abort ();
3411
3412 rela.r_offset = (h->root.u.def.value
3413 + h->root.u.def.section->output_section->vma
3414 + h->root.u.def.section->output_offset);
3415 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3416 rela.r_addend = 0;
3417 if (h->root.u.def.section == htab->elf.sdynrelro)
3418 s = htab->elf.sreldynrelro;
3419 else
3420 s = htab->elf.srelbss;
3421 loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela);
3422 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3423 }
3424
3425 /* Mark some specially defined symbols as absolute. */
3426 if (h == htab->elf.hdynamic
3427 || h == htab->elf.hgot
3428 || h == htab->elf.hplt)
3429 sym->st_shndx = SHN_ABS;
3430
3431 return true;
3432 }
3433
3434 /* Used to decide how to sort relocs in an optimal manner for the
3435 dynamic linker, before writing them out. */
3436
3437 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)3438 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3439 const asection *rel_sec ATTRIBUTE_UNUSED,
3440 const Elf_Internal_Rela *rela)
3441 {
3442 bfd *abfd = info->output_bfd;
3443 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3444 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3445 unsigned long r_symndx = ELF64_R_SYM (rela->r_info);
3446 Elf_Internal_Sym sym;
3447
3448 if (htab->elf.dynsym == NULL
3449 || !bed->s->swap_symbol_in (abfd,
3450 (htab->elf.dynsym->contents
3451 + r_symndx * bed->s->sizeof_sym),
3452 0, &sym))
3453 abort ();
3454
3455 /* Check relocation against STT_GNU_IFUNC symbol. */
3456 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3457 return reloc_class_ifunc;
3458
3459 switch ((int) ELF64_R_TYPE (rela->r_info))
3460 {
3461 case R_390_RELATIVE:
3462 return reloc_class_relative;
3463 case R_390_JMP_SLOT:
3464 return reloc_class_plt;
3465 case R_390_COPY:
3466 return reloc_class_copy;
3467 default:
3468 return reloc_class_normal;
3469 }
3470 }
3471
3472 /* Finish up the dynamic sections. */
3473
3474 static bool
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3475 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3476 struct bfd_link_info *info)
3477 {
3478 struct elf_s390_link_hash_table *htab;
3479 bfd *dynobj;
3480 asection *sdyn;
3481 bfd *ibfd;
3482 unsigned int i;
3483
3484 htab = elf_s390_hash_table (info);
3485 if (htab == NULL)
3486 return false;
3487
3488 dynobj = htab->elf.dynobj;
3489 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3490
3491 if (htab->elf.dynamic_sections_created)
3492 {
3493 Elf64_External_Dyn *dyncon, *dynconend;
3494
3495 if (sdyn == NULL || htab->elf.sgot == NULL)
3496 abort ();
3497
3498 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3499 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3500 for (; dyncon < dynconend; dyncon++)
3501 {
3502 Elf_Internal_Dyn dyn;
3503 asection *s;
3504
3505 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3506
3507 switch (dyn.d_tag)
3508 {
3509 default:
3510 continue;
3511
3512 case DT_PLTGOT:
3513 /* DT_PLTGOT matches _GLOBAL_OFFSET_TABLE_ */
3514 dyn.d_un.d_ptr = s390_got_pointer (info);
3515 break;
3516
3517 case DT_JMPREL:
3518 s = htab->elf.srelplt;
3519 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3520 break;
3521
3522 case DT_PLTRELSZ:
3523 dyn.d_un.d_val = htab->elf.srelplt->size;
3524 if (htab->elf.irelplt)
3525 dyn.d_un.d_val += htab->elf.irelplt->size;
3526 break;
3527
3528 case DT_RELASZ:
3529 /* The procedure linkage table relocs (DT_JMPREL) should
3530 not be included in the overall relocs (DT_RELA).
3531 Therefore, we override the DT_RELASZ entry here to
3532 make it not include the JMPREL relocs. Since the
3533 linker script arranges for .rela.plt to follow all
3534 other relocation sections, we don't have to worry
3535 about changing the DT_RELA entry. */
3536 dyn.d_un.d_val -= htab->elf.srelplt->size;
3537 if (htab->elf.irelplt)
3538 dyn.d_un.d_val -= htab->elf.irelplt->size;
3539 break;
3540 }
3541
3542 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3543 }
3544
3545 /* Fill in the special first entry in the procedure linkage table. */
3546 if (htab->elf.splt && htab->elf.splt->size > 0)
3547 {
3548 /* fill in blueprint for plt 0 entry */
3549 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
3550 PLT_FIRST_ENTRY_SIZE);
3551 /* The second instruction in the first PLT entry is a LARL
3552 loading the GOT pointer. Fill in the LARL immediate
3553 address. */
3554 bfd_put_32 (output_bfd,
3555 (s390_got_pointer (info)
3556 - htab->elf.splt->output_section->vma
3557 - htab->elf.splt->output_offset - 6)/2,
3558 htab->elf.splt->contents + 8);
3559 }
3560 if (elf_section_data (htab->elf.splt->output_section) != NULL)
3561 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
3562 = PLT_ENTRY_SIZE;
3563 }
3564
3565 if (htab->elf.hgot && htab->elf.hgot->root.u.def.section)
3566 {
3567 /* Fill in the first three entries in the global offset table. */
3568 if (htab->elf.hgot->root.u.def.section->size > 0)
3569 {
3570 bfd_put_64 (output_bfd,
3571 (sdyn == NULL ? (bfd_vma) 0
3572 : sdyn->output_section->vma + sdyn->output_offset),
3573 htab->elf.hgot->root.u.def.section->contents);
3574 /* One entry for shared object struct ptr. */
3575 bfd_put_64 (output_bfd, (bfd_vma) 0,
3576 htab->elf.hgot->root.u.def.section->contents + 8);
3577 /* One entry for _dl_runtime_resolve. */
3578 bfd_put_64 (output_bfd, (bfd_vma) 0,
3579 htab->elf.hgot->root.u.def.section->contents + 16);
3580 }
3581 if (htab->elf.sgot != NULL && htab->elf.sgot->size > 0)
3582 elf_section_data (htab->elf.sgot->output_section)
3583 ->this_hdr.sh_entsize = 8;
3584 }
3585
3586 /* Finish dynamic symbol for local IFUNC symbols. */
3587 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3588 {
3589 struct plt_entry *local_plt;
3590 Elf_Internal_Sym *isym;
3591 Elf_Internal_Shdr *symtab_hdr;
3592
3593 symtab_hdr = &elf_symtab_hdr (ibfd);
3594
3595 if (!is_s390_elf (ibfd))
3596 continue;
3597
3598 local_plt = elf_s390_local_plt (ibfd);
3599 if (local_plt != NULL)
3600 for (i = 0; i < symtab_hdr->sh_info; i++)
3601 {
3602 if (local_plt[i].plt.offset != (bfd_vma) -1)
3603 {
3604 asection *sec = local_plt[i].sec;
3605 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i);
3606 if (isym == NULL)
3607 return false;
3608
3609 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3610 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3611 local_plt[i].plt.offset,
3612 isym->st_value
3613 + sec->output_section->vma
3614 + sec->output_offset);
3615
3616 }
3617 }
3618 }
3619
3620 return true;
3621 }
3622
3623 /* Support for core dump NOTE sections. */
3624
3625 static bool
elf_s390_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)3626 elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3627 {
3628 int offset;
3629 size_t size;
3630
3631 switch (note->descsz)
3632 {
3633 default:
3634 return false;
3635
3636 case 336: /* sizeof(struct elf_prstatus) on s390x */
3637 /* pr_cursig */
3638 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3639
3640 /* pr_pid */
3641 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);
3642
3643 /* pr_reg */
3644 offset = 112;
3645 size = 216;
3646 break;
3647 }
3648
3649 /* Make a ".reg/999" section. */
3650 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3651 size, note->descpos + offset);
3652 }
3653
3654 static bool
elf_s390_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)3655 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3656 {
3657 switch (note->descsz)
3658 {
3659 default:
3660 return false;
3661
3662 case 136: /* sizeof(struct elf_prpsinfo) on s390x */
3663 elf_tdata (abfd)->core->pid
3664 = bfd_get_32 (abfd, note->descdata + 24);
3665 elf_tdata (abfd)->core->program
3666 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
3667 elf_tdata (abfd)->core->command
3668 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
3669 }
3670
3671 /* Note that for some reason, a spurious space is tacked
3672 onto the end of the args in some (at least one anyway)
3673 implementations, so strip it off if it exists. */
3674
3675 {
3676 char *command = elf_tdata (abfd)->core->command;
3677 int n = strlen (command);
3678
3679 if (0 < n && command[n - 1] == ' ')
3680 command[n - 1] = '\0';
3681 }
3682
3683 return true;
3684 }
3685
3686 static char *
elf_s390_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)3687 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3688 int note_type, ...)
3689 {
3690 va_list ap;
3691
3692 switch (note_type)
3693 {
3694 default:
3695 return NULL;
3696
3697 case NT_PRPSINFO:
3698 {
3699 char data[136] ATTRIBUTE_NONSTRING = { 0 };
3700 const char *fname, *psargs;
3701
3702 va_start (ap, note_type);
3703 fname = va_arg (ap, const char *);
3704 psargs = va_arg (ap, const char *);
3705 va_end (ap);
3706
3707 strncpy (data + 40, fname, 16);
3708 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3709 DIAGNOSTIC_PUSH;
3710 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
3711 -Wstringop-truncation:
3712 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
3713 */
3714 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
3715 #endif
3716 strncpy (data + 56, psargs, 80);
3717 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3718 DIAGNOSTIC_POP;
3719 #endif
3720 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3721 &data, sizeof (data));
3722 }
3723
3724 case NT_PRSTATUS:
3725 {
3726 char data[336] = { 0 };
3727 long pid;
3728 int cursig;
3729 const void *gregs;
3730
3731 va_start (ap, note_type);
3732 pid = va_arg (ap, long);
3733 cursig = va_arg (ap, int);
3734 gregs = va_arg (ap, const void *);
3735 va_end (ap);
3736
3737 bfd_put_16 (abfd, cursig, data + 12);
3738 bfd_put_32 (abfd, pid, data + 32);
3739 memcpy (data + 112, gregs, 216);
3740 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3741 &data, sizeof (data));
3742 }
3743 }
3744 /* NOTREACHED */
3745 }
3746
3747 /* Return address for Ith PLT stub in section PLT, for relocation REL
3748 or (bfd_vma) -1 if it should not be included. */
3749
3750 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3751 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3752 const arelent *rel ATTRIBUTE_UNUSED)
3753 {
3754 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3755 }
3756
3757 /* Merge backend specific data from an object file to the output
3758 object file when linking. */
3759
3760 static bool
elf64_s390_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)3761 elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3762 {
3763 if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd))
3764 return true;
3765
3766 return elf_s390_merge_obj_attributes (ibfd, info);
3767 }
3768
3769 /* We may add a PT_S390_PGSTE program header. */
3770
3771 static int
elf_s390_additional_program_headers(bfd * abfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)3772 elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED,
3773 struct bfd_link_info *info)
3774 {
3775 struct elf_s390_link_hash_table *htab;
3776
3777 if (info)
3778 {
3779 htab = elf_s390_hash_table (info);
3780 if (htab)
3781 return htab->params->pgste;
3782 }
3783 return 0;
3784 }
3785
3786
3787 /* Add the PT_S390_PGSTE program header. */
3788
3789 static bool
elf_s390_modify_segment_map(bfd * abfd,struct bfd_link_info * info)3790 elf_s390_modify_segment_map (bfd *abfd, struct bfd_link_info *info)
3791 {
3792 struct elf_s390_link_hash_table *htab;
3793 struct elf_segment_map *m, *pm = NULL;
3794
3795 if (!abfd || !info)
3796 return true;
3797
3798 htab = elf_s390_hash_table (info);
3799 if (!htab || !htab->params->pgste)
3800 return true;
3801
3802 /* If there is already a PT_S390_PGSTE header, avoid adding
3803 another. */
3804 m = elf_seg_map (abfd);
3805 while (m && m->p_type != PT_S390_PGSTE)
3806 {
3807 pm = m;
3808 m = m->next;
3809 }
3810
3811 if (m)
3812 return true;
3813
3814 m = (struct elf_segment_map *)
3815 bfd_zalloc (abfd, sizeof (struct elf_segment_map));
3816 if (m == NULL)
3817 return false;
3818 m->p_type = PT_S390_PGSTE;
3819 m->count = 0;
3820 m->next = NULL;
3821 if (pm)
3822 pm->next = m;
3823
3824 return true;
3825 }
3826
3827 bool
bfd_elf_s390_set_options(struct bfd_link_info * info,struct s390_elf_params * params)3828 bfd_elf_s390_set_options (struct bfd_link_info *info,
3829 struct s390_elf_params *params)
3830 {
3831 struct elf_s390_link_hash_table *htab;
3832
3833 if (info)
3834 {
3835 htab = elf_s390_hash_table (info);
3836 if (htab)
3837 htab->params = params;
3838 }
3839
3840 return true;
3841 }
3842
3843
3844 /* Why was the hash table entry size definition changed from
3845 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3846 this is the only reason for the s390_elf64_size_info structure. */
3847
3848 const struct elf_size_info s390_elf64_size_info =
3849 {
3850 sizeof (Elf64_External_Ehdr),
3851 sizeof (Elf64_External_Phdr),
3852 sizeof (Elf64_External_Shdr),
3853 sizeof (Elf64_External_Rel),
3854 sizeof (Elf64_External_Rela),
3855 sizeof (Elf64_External_Sym),
3856 sizeof (Elf64_External_Dyn),
3857 sizeof (Elf_External_Note),
3858 8, /* hash-table entry size. */
3859 1, /* internal relocations per external relocations. */
3860 64, /* arch_size. */
3861 3, /* log_file_align. */
3862 ELFCLASS64, EV_CURRENT,
3863 bfd_elf64_write_out_phdrs,
3864 bfd_elf64_write_shdrs_and_ehdr,
3865 bfd_elf64_checksum_contents,
3866 bfd_elf64_write_relocs,
3867 bfd_elf64_swap_symbol_in,
3868 bfd_elf64_swap_symbol_out,
3869 bfd_elf64_slurp_reloc_table,
3870 bfd_elf64_slurp_symbol_table,
3871 bfd_elf64_swap_dyn_in,
3872 bfd_elf64_swap_dyn_out,
3873 bfd_elf64_swap_reloc_in,
3874 bfd_elf64_swap_reloc_out,
3875 bfd_elf64_swap_reloca_in,
3876 bfd_elf64_swap_reloca_out
3877 };
3878
3879 #define TARGET_BIG_SYM s390_elf64_vec
3880 #define TARGET_BIG_NAME "elf64-s390"
3881 #define ELF_ARCH bfd_arch_s390
3882 #define ELF_TARGET_ID S390_ELF_DATA
3883 #define ELF_MACHINE_CODE EM_S390
3884 #define ELF_MACHINE_ALT1 EM_S390_OLD
3885 #define ELF_MAXPAGESIZE 0x1000
3886
3887 #define elf_backend_size_info s390_elf64_size_info
3888
3889 #define elf_backend_can_gc_sections 1
3890 #define elf_backend_can_refcount 1
3891 #define elf_backend_want_got_plt 1
3892 #define elf_backend_plt_readonly 1
3893 #define elf_backend_want_plt_sym 0
3894 #define elf_backend_got_header_size 24
3895 #define elf_backend_want_dynrelro 1
3896 #define elf_backend_rela_normal 1
3897
3898 #define elf_info_to_howto elf_s390_info_to_howto
3899
3900 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3901 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3902 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3903 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3904 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data
3905
3906 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3907 #define elf_backend_check_relocs elf_s390_check_relocs
3908 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3909 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3910 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3911 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3912 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3913 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3914 #define elf_backend_relocate_section elf_s390_relocate_section
3915 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3916 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3917 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3918 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
3919 #define elf_backend_write_core_note elf_s390_write_core_note
3920 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3921 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
3922 #define elf_backend_additional_program_headers elf_s390_additional_program_headers
3923 #define elf_backend_modify_segment_map elf_s390_modify_segment_map
3924
3925 #define bfd_elf64_mkobject elf_s390_mkobject
3926 #define elf_backend_object_p elf_s390_object_p
3927
3928 #include "elf64-target.h"
3929