1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright (C) 2000-2021 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 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
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, 0, 8, false, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
61 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont,
62 bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
63 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
65 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
67 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
69 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
71 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
73 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
75 HOWTO(R_390_COPY, 0, 4, 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, 4, 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, 4, 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, 4, 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, 2, 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, 4, 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, 1, 16, false, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
89 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
91 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
93 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
95 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
97 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
99 HOWTO(R_390_GOTPCDBL, 1, 2, 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, 4, 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, 4, 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, 4, 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, 4, 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, 2, 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, 1, 16, false, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_390_GOTOFF16", false, 0,0x0000ffff, false),
113 HOWTO(R_390_GOTOFF64, 0, 4, 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, 1, 12, false, 0, complain_overflow_dont,
116 bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false),
117 HOWTO(R_390_GOTPLT16, 0, 1, 16, false, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false),
119 HOWTO(R_390_GOTPLT32, 0, 2, 32, false, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_GOTPLT32", false, 0,0xffffffff, false),
121 HOWTO(R_390_GOTPLT64, 0, 4, 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, 2, 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, 1, 16, false, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false),
127 HOWTO(R_390_PLTOFF32, 0, 2, 32, false, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_PLTOFF32", false, 0,0xffffffff, false),
129 HOWTO(R_390_PLTOFF64, 0, 4, 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, 4, 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, 1, 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, 4, 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, 4, 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, 4, 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, 2, 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, 2, 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, 4, 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, 4, 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, 4, 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, 4, 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, 2, 20, false, 8, complain_overflow_dont,
166 s390_elf_ldisp_reloc, "R_390_20", false, 0,0x0fffff00, false),
167 HOWTO(R_390_GOT20, 0, 2, 20, false, 8, complain_overflow_dont,
168 s390_elf_ldisp_reloc, "R_390_GOT20", false, 0,0x0fffff00, false),
169 HOWTO(R_390_GOTPLT20, 0, 2, 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, 2, 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, 4, 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, 1, 12, true, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_PC12DBL", false, 0,0x00000fff, true),
177 HOWTO(R_390_PLT12DBL, 1, 1, 12, true, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true),
179 HOWTO(R_390_PC24DBL, 1, 2, 24, true, 0, complain_overflow_bitfield,
180 bfd_elf_generic_reloc, "R_390_PC24DBL", false, 0,0x00ffffff, true),
181 HOWTO(R_390_PLT24DBL, 1, 2, 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, 0,4,0,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, 0,4,0,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_pic (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_pic (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_pic (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_pic (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 relocs = true;
1880
1881 /* We use the reloc_count field as a counter if we need
1882 to copy relocs into the output file. */
1883 s->reloc_count = 0;
1884 }
1885 else
1886 {
1887 /* It's not one of our sections, so don't allocate space. */
1888 continue;
1889 }
1890
1891 if (s->size == 0)
1892 {
1893 /* If we don't need this section, strip it from the
1894 output file. This is to handle .rela.bss and
1895 .rela.plt. We must create it in
1896 create_dynamic_sections, because it must be created
1897 before the linker maps input sections to output
1898 sections. The linker does that before
1899 adjust_dynamic_symbol is called, and it is that
1900 function which decides whether anything needs to go
1901 into these sections. */
1902
1903 s->flags |= SEC_EXCLUDE;
1904 continue;
1905 }
1906
1907 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1908 continue;
1909
1910 /* Allocate memory for the section contents. We use bfd_zalloc
1911 here in case unused entries are not reclaimed before the
1912 section's contents are written out. This should not happen,
1913 but this way if it does, we get a R_390_NONE reloc instead
1914 of garbage. */
1915 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1916 if (s->contents == NULL)
1917 return false;
1918 }
1919
1920 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1921 }
1922
1923 /* Return the base VMA address which should be subtracted from real addresses
1924 when resolving @dtpoff relocation.
1925 This is PT_TLS segment p_vaddr. */
1926
1927 static bfd_vma
dtpoff_base(struct bfd_link_info * info)1928 dtpoff_base (struct bfd_link_info *info)
1929 {
1930 /* If tls_sec is NULL, we should have signalled an error already. */
1931 if (elf_hash_table (info)->tls_sec == NULL)
1932 return 0;
1933 return elf_hash_table (info)->tls_sec->vma;
1934 }
1935
1936 /* Return the relocation value for @tpoff relocation
1937 if STT_TLS virtual address is ADDRESS. */
1938
1939 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)1940 tpoff (struct bfd_link_info *info, bfd_vma address)
1941 {
1942 struct elf_link_hash_table *htab = elf_hash_table (info);
1943
1944 /* If tls_sec is NULL, we should have signalled an error already. */
1945 if (htab->tls_sec == NULL)
1946 return 0;
1947 return htab->tls_size + htab->tls_sec->vma - address;
1948 }
1949
1950 /* Complain if TLS instruction relocation is against an invalid
1951 instruction. */
1952
1953 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)1954 invalid_tls_insn (bfd *input_bfd,
1955 asection *input_section,
1956 Elf_Internal_Rela *rel)
1957 {
1958 reloc_howto_type *howto;
1959
1960 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
1961 _bfd_error_handler
1962 /* xgettext:c-format */
1963 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
1964 input_bfd,
1965 input_section,
1966 (uint64_t) rel->r_offset,
1967 howto->name);
1968 bfd_set_error (bfd_error_bad_value);
1969 }
1970
1971 /* Relocate a 390 ELF section. */
1972
1973 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)1974 elf_s390_relocate_section (bfd *output_bfd,
1975 struct bfd_link_info *info,
1976 bfd *input_bfd,
1977 asection *input_section,
1978 bfd_byte *contents,
1979 Elf_Internal_Rela *relocs,
1980 Elf_Internal_Sym *local_syms,
1981 asection **local_sections)
1982 {
1983 struct elf_s390_link_hash_table *htab;
1984 Elf_Internal_Shdr *symtab_hdr;
1985 struct elf_link_hash_entry **sym_hashes;
1986 bfd_vma *local_got_offsets;
1987 Elf_Internal_Rela *rel;
1988 Elf_Internal_Rela *relend;
1989
1990 if (!is_s390_elf (input_bfd))
1991 {
1992 bfd_set_error (bfd_error_wrong_format);
1993 return false;
1994 }
1995
1996 htab = elf_s390_hash_table (info);
1997 if (htab == NULL)
1998 return false;
1999
2000 symtab_hdr = &elf_symtab_hdr (input_bfd);
2001 sym_hashes = elf_sym_hashes (input_bfd);
2002 local_got_offsets = elf_local_got_offsets (input_bfd);
2003
2004 rel = relocs;
2005 relend = relocs + input_section->reloc_count;
2006 for (; rel < relend; rel++)
2007 {
2008 unsigned int r_type;
2009 reloc_howto_type *howto;
2010 unsigned long r_symndx;
2011 struct elf_link_hash_entry *h;
2012 Elf_Internal_Sym *sym;
2013 asection *sec;
2014 bfd_vma off;
2015 bfd_vma relocation;
2016 bool unresolved_reloc;
2017 bfd_reloc_status_type r;
2018 int tls_type;
2019 bool resolved_to_zero;
2020
2021 r_type = ELF64_R_TYPE (rel->r_info);
2022 if (r_type == (int) R_390_GNU_VTINHERIT
2023 || r_type == (int) R_390_GNU_VTENTRY)
2024 continue;
2025 if (r_type >= (int) R_390_max)
2026 {
2027 bfd_set_error (bfd_error_bad_value);
2028 return false;
2029 }
2030
2031 howto = elf_howto_table + r_type;
2032 r_symndx = ELF64_R_SYM (rel->r_info);
2033
2034 h = NULL;
2035 sym = NULL;
2036 sec = NULL;
2037 unresolved_reloc = false;
2038 if (r_symndx < symtab_hdr->sh_info)
2039 {
2040 sym = local_syms + r_symndx;
2041 sec = local_sections[r_symndx];
2042
2043 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2044 {
2045 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2046 if (local_plt == NULL)
2047 return false;
2048
2049 /* Address of the PLT slot. */
2050 relocation = (htab->elf.iplt->output_section->vma
2051 + htab->elf.iplt->output_offset
2052 + local_plt[r_symndx].plt.offset);
2053
2054 switch (r_type)
2055 {
2056 case R_390_PLTOFF16:
2057 case R_390_PLTOFF32:
2058 case R_390_PLTOFF64:
2059 relocation -= s390_got_pointer (info);
2060 break;
2061 case R_390_GOTPLT12:
2062 case R_390_GOTPLT16:
2063 case R_390_GOTPLT20:
2064 case R_390_GOTPLT32:
2065 case R_390_GOTPLT64:
2066 case R_390_GOTPLTENT:
2067 case R_390_GOT12:
2068 case R_390_GOT16:
2069 case R_390_GOT20:
2070 case R_390_GOT32:
2071 case R_390_GOT64:
2072 case R_390_GOTENT:
2073 {
2074 /* Write the PLT slot address into the GOT slot. */
2075 bfd_put_64 (output_bfd, relocation,
2076 htab->elf.sgot->contents +
2077 local_got_offsets[r_symndx]);
2078 relocation = (local_got_offsets[r_symndx] +
2079 s390_got_offset (info));
2080
2081 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2082 relocation += s390_got_pointer (info);
2083 break;
2084 }
2085 default:
2086 break;
2087 }
2088 /* The output section is needed later in
2089 finish_dynamic_section when creating the dynamic
2090 relocation. */
2091 local_plt[r_symndx].sec = sec;
2092 goto do_relocation;
2093 }
2094 else
2095 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2096 }
2097 else
2098 {
2099 bool warned ATTRIBUTE_UNUSED;
2100 bool ignored ATTRIBUTE_UNUSED;
2101
2102 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2103 r_symndx, symtab_hdr, sym_hashes,
2104 h, sec, relocation,
2105 unresolved_reloc, warned, ignored);
2106 }
2107
2108 if (sec != NULL && discarded_section (sec))
2109 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2110 rel, 1, relend, howto, 0, contents);
2111
2112 if (bfd_link_relocatable (info))
2113 continue;
2114
2115 resolved_to_zero = (h != NULL
2116 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
2117
2118 switch (r_type)
2119 {
2120 case R_390_GOTPLT12:
2121 case R_390_GOTPLT16:
2122 case R_390_GOTPLT20:
2123 case R_390_GOTPLT32:
2124 case R_390_GOTPLT64:
2125 case R_390_GOTPLTENT:
2126 /* There are three cases for a GOTPLT relocation. 1) The
2127 relocation is against the jump slot entry of a plt that
2128 will get emitted to the output file. 2) The relocation
2129 is against the jump slot of a plt entry that has been
2130 removed. elf_s390_adjust_gotplt has created a GOT entry
2131 as replacement. 3) The relocation is against a local symbol.
2132 Cases 2) and 3) are the same as the GOT relocation code
2133 so we just have to test for case 1 and fall through for
2134 the other two. */
2135 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2136 {
2137 bfd_vma plt_index;
2138
2139 if (s390_is_ifunc_symbol_p (h))
2140 {
2141 /* Entry indices of .iplt and .igot.plt match
2142 1:1. No magic PLT first entry here. */
2143 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2144 relocation = (plt_index * GOT_ENTRY_SIZE
2145 + s390_gotplt_offset (info)
2146 + htab->elf.igotplt->output_offset);
2147 }
2148 else
2149 {
2150 plt_index = ((h->plt.offset - PLT_FIRST_ENTRY_SIZE)
2151 / PLT_ENTRY_SIZE);
2152
2153 relocation = (plt_index * GOT_ENTRY_SIZE
2154 + s390_gotplt_offset (info));
2155 }
2156 if (r_type == R_390_GOTPLTENT)
2157 relocation += s390_got_pointer (info);
2158 unresolved_reloc = false;
2159 break;
2160 }
2161 /* Fall through. */
2162
2163 case R_390_GOT12:
2164 case R_390_GOT16:
2165 case R_390_GOT20:
2166 case R_390_GOT32:
2167 case R_390_GOT64:
2168 case R_390_GOTENT:
2169 /* Relocation is to the entry for this symbol in the global
2170 offset table. */
2171 if (htab->elf.sgot == NULL)
2172 abort ();
2173
2174 if (h != NULL)
2175 {
2176 bool dyn;
2177
2178 off = h->got.offset;
2179 dyn = htab->elf.dynamic_sections_created;
2180
2181 if (s390_is_ifunc_symbol_p (h))
2182 {
2183 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2184 if (off == (bfd_vma)-1)
2185 {
2186 /* No explicit GOT usage so redirect to the
2187 got.iplt slot. */
2188 relocation = (s390_gotplt_offset (info)
2189 + htab->elf.igotplt->output_offset
2190 + (h->plt.offset / PLT_ENTRY_SIZE
2191 * GOT_ENTRY_SIZE));
2192
2193 /* For @GOTENT the relocation is against the offset between
2194 the instruction and the symbols entry in the GOT and not
2195 between the start of the GOT and the symbols entry. We
2196 add the vma of the GOT to get the correct value. */
2197 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2198 relocation += s390_got_pointer (info);
2199
2200 break;
2201 }
2202 else
2203 {
2204 /* Explicit GOT slots must contain the address
2205 of the PLT slot. This will be handled in
2206 finish_dynamic_symbol. */
2207 }
2208 }
2209 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2210 bfd_link_pic (info),
2211 h)
2212 || (bfd_link_pic (info)
2213 && SYMBOL_REFERENCES_LOCAL (info, h))
2214 || resolved_to_zero)
2215 {
2216 Elf_Internal_Sym *isym;
2217 asection *sym_sec;
2218
2219 /* This is actually a static link, or it is a
2220 -Bsymbolic link and the symbol is defined
2221 locally, or the symbol was forced to be local
2222 because of a version file. We must initialize
2223 this entry in the global offset table. Since the
2224 offset must always be a multiple of 2, we use the
2225 least significant bit to record whether we have
2226 initialized it already.
2227
2228 When doing a dynamic link, we create a .rel.got
2229 relocation entry to initialize the value. This
2230 is done in the finish_dynamic_symbol routine. */
2231 if ((off & 1) != 0)
2232 off &= ~1;
2233 else
2234 {
2235 bfd_put_64 (output_bfd, relocation,
2236 htab->elf.sgot->contents + off);
2237 h->got.offset |= 1;
2238 }
2239
2240 /* When turning a GOT slot dereference into a direct
2241 reference using larl we have to make sure that
2242 the symbol is 1. properly aligned and 2. it is no
2243 ABS symbol or will become one. */
2244 if ((h->def_regular
2245 && bfd_link_pic (info)
2246 && SYMBOL_REFERENCES_LOCAL (info, h))
2247 /* lgrl rx,sym@GOTENT -> larl rx, sym */
2248 && ((r_type == R_390_GOTENT
2249 && (bfd_get_16 (input_bfd,
2250 contents + rel->r_offset - 2)
2251 & 0xff0f) == 0xc408)
2252 /* lg rx, sym@GOT(r12) -> larl rx, sym */
2253 || (r_type == R_390_GOT20
2254 && (bfd_get_32 (input_bfd,
2255 contents + rel->r_offset - 2)
2256 & 0xff00f000) == 0xe300c000
2257 && bfd_get_8 (input_bfd,
2258 contents + rel->r_offset + 3) == 0x04))
2259 && (isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
2260 input_bfd, r_symndx))
2261 && isym->st_shndx != SHN_ABS
2262 && h != htab->elf.hdynamic
2263 && h != htab->elf.hgot
2264 && h != htab->elf.hplt
2265 && !(isym->st_value & 1)
2266 && (sym_sec = bfd_section_from_elf_index (input_bfd,
2267 isym->st_shndx))
2268 && sym_sec->alignment_power)
2269 {
2270 unsigned short new_insn =
2271 (0xc000 | (bfd_get_8 (input_bfd,
2272 contents + rel->r_offset - 1) & 0xf0));
2273 bfd_put_16 (output_bfd, new_insn,
2274 contents + rel->r_offset - 2);
2275 r_type = R_390_PC32DBL;
2276 rel->r_addend = 2;
2277 howto = elf_howto_table + r_type;
2278 relocation = h->root.u.def.value
2279 + h->root.u.def.section->output_section->vma
2280 + h->root.u.def.section->output_offset;
2281 goto do_relocation;
2282 }
2283 }
2284 else
2285 unresolved_reloc = false;
2286 }
2287 else
2288 {
2289 if (local_got_offsets == NULL)
2290 abort ();
2291
2292 off = local_got_offsets[r_symndx];
2293
2294 /* The offset must always be a multiple of 8. We use
2295 the least significant bit to record whether we have
2296 already generated the necessary reloc. */
2297 if ((off & 1) != 0)
2298 off &= ~1;
2299 else
2300 {
2301 bfd_put_64 (output_bfd, relocation,
2302 htab->elf.sgot->contents + off);
2303
2304 if (bfd_link_pic (info))
2305 {
2306 asection *s;
2307 Elf_Internal_Rela outrel;
2308 bfd_byte *loc;
2309
2310 s = htab->elf.srelgot;
2311 if (s == NULL)
2312 abort ();
2313
2314 outrel.r_offset = (htab->elf.sgot->output_section->vma
2315 + htab->elf.sgot->output_offset
2316 + off);
2317 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2318 outrel.r_addend = relocation;
2319 loc = s->contents;
2320 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2321 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2322 }
2323
2324 local_got_offsets[r_symndx] |= 1;
2325 }
2326 }
2327
2328 if (off >= (bfd_vma) -2)
2329 abort ();
2330
2331 relocation = s390_got_offset (info) + off;
2332
2333 /* For @GOTENT the relocation is against the offset between
2334 the instruction and the symbols entry in the GOT and not
2335 between the start of the GOT and the symbols entry. We
2336 add the vma of the GOT to get the correct value. */
2337 if ( r_type == R_390_GOTENT
2338 || r_type == R_390_GOTPLTENT)
2339 relocation += s390_got_pointer (info);
2340
2341 break;
2342
2343 case R_390_GOTOFF16:
2344 case R_390_GOTOFF32:
2345 case R_390_GOTOFF64:
2346 /* Relocation is relative to the start of the global offset
2347 table. */
2348
2349 if (h != NULL
2350 && s390_is_ifunc_symbol_p (h)
2351 && h->def_regular
2352 && !bfd_link_executable (info))
2353 {
2354 relocation = (htab->elf.iplt->output_section->vma
2355 + htab->elf.iplt->output_offset
2356 + h->plt.offset
2357 - s390_got_pointer (info));
2358 goto do_relocation;
2359 }
2360
2361 relocation -= s390_got_pointer (info);
2362 break;
2363
2364 case R_390_GOTPC:
2365 case R_390_GOTPCDBL:
2366 /* Use global offset table as symbol value. */
2367 relocation = s390_got_pointer (info);
2368 unresolved_reloc = false;
2369 break;
2370
2371 case R_390_PLT12DBL:
2372 case R_390_PLT16DBL:
2373 case R_390_PLT24DBL:
2374 case R_390_PLT32:
2375 case R_390_PLT32DBL:
2376 case R_390_PLT64:
2377 /* Relocation is to the entry for this symbol in the
2378 procedure linkage table. */
2379
2380 /* Resolve a PLT32 reloc against a local symbol directly,
2381 without using the procedure linkage table. */
2382 if (h == NULL)
2383 break;
2384
2385 if (h->plt.offset == (bfd_vma) -1
2386 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2387 {
2388 /* We didn't make a PLT entry for this symbol. This
2389 happens when statically linking PIC code, or when
2390 using -Bsymbolic. */
2391 break;
2392 }
2393 if (s390_is_ifunc_symbol_p (h))
2394 relocation = (htab->elf.iplt->output_section->vma
2395 + htab->elf.iplt->output_offset
2396 + h->plt.offset);
2397 else
2398 relocation = (htab->elf.splt->output_section->vma
2399 + htab->elf.splt->output_offset
2400 + h->plt.offset);
2401 unresolved_reloc = false;
2402 break;
2403
2404 case R_390_PLTOFF16:
2405 case R_390_PLTOFF32:
2406 case R_390_PLTOFF64:
2407 /* Relocation is to the entry for this symbol in the
2408 procedure linkage table relative to the start of the GOT. */
2409
2410 /* For local symbols or if we didn't make a PLT entry for
2411 this symbol resolve the symbol directly. */
2412 if (h == NULL
2413 || h->plt.offset == (bfd_vma) -1
2414 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2415 {
2416 relocation -= s390_got_pointer (info);
2417 break;
2418 }
2419
2420 if (s390_is_ifunc_symbol_p (h))
2421 relocation = (htab->elf.iplt->output_section->vma
2422 + htab->elf.iplt->output_offset
2423 + h->plt.offset
2424 - s390_got_pointer (info));
2425 else
2426 relocation = (htab->elf.splt->output_section->vma
2427 + htab->elf.splt->output_offset
2428 + h->plt.offset
2429 - s390_got_pointer (info));
2430 unresolved_reloc = false;
2431 break;
2432
2433 case R_390_PC16:
2434 case R_390_PC12DBL:
2435 case R_390_PC16DBL:
2436 case R_390_PC24DBL:
2437 case R_390_PC32:
2438 case R_390_PC32DBL:
2439 case R_390_PC64:
2440 if (h != NULL
2441 && bfd_link_pie (info)
2442 && !h->def_regular)
2443 {
2444 _bfd_error_handler (_("%pB: `%s' non-PLT reloc for symbol defined "
2445 "in shared library and accessed "
2446 "from executable "
2447 "(rebuild file with -fPIC ?)"),
2448 input_bfd, h->root.root.string);
2449 bfd_set_error (bfd_error_bad_value);
2450 return false;
2451 }
2452 /* The target of these relocs are instruction operands
2453 residing in read-only sections. We cannot emit a runtime
2454 reloc for it. */
2455 if (h != NULL
2456 && s390_is_ifunc_symbol_p (h)
2457 && h->def_regular
2458 && bfd_link_pic (info))
2459 {
2460 relocation = (htab->elf.iplt->output_section->vma
2461 + htab->elf.iplt->output_offset
2462 + h->plt.offset);
2463 goto do_relocation;
2464 }
2465 /* Fall through. */
2466
2467 case R_390_8:
2468 case R_390_16:
2469 case R_390_32:
2470 case R_390_64:
2471
2472 if ((input_section->flags & SEC_ALLOC) == 0)
2473 break;
2474
2475 if (h != NULL
2476 && s390_is_ifunc_symbol_p (h)
2477 && h->def_regular)
2478 {
2479 if (!bfd_link_pic (info))
2480 {
2481 /* For a non-shared object the symbol will not
2482 change. Hence we can write the address of the
2483 target IPLT slot now. */
2484 relocation = (htab->elf.iplt->output_section->vma
2485 + htab->elf.iplt->output_offset
2486 + h ->plt.offset);
2487 goto do_relocation;
2488 }
2489 else
2490 {
2491 /* For shared objects a runtime relocation is needed. */
2492
2493 Elf_Internal_Rela outrel;
2494 asection *sreloc;
2495
2496 /* Need a dynamic relocation to get the real function
2497 address. */
2498 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2499 info,
2500 input_section,
2501 rel->r_offset);
2502 if (outrel.r_offset == (bfd_vma) -1
2503 || outrel.r_offset == (bfd_vma) -2)
2504 abort ();
2505
2506 outrel.r_offset += (input_section->output_section->vma
2507 + input_section->output_offset);
2508
2509 if (h->dynindx == -1
2510 || h->forced_local
2511 || bfd_link_executable (info))
2512 {
2513 /* This symbol is resolved locally. */
2514 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
2515 outrel.r_addend = (h->root.u.def.value
2516 + h->root.u.def.section->output_section->vma
2517 + h->root.u.def.section->output_offset);
2518 }
2519 else
2520 {
2521 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2522 outrel.r_addend = 0;
2523 }
2524
2525 sreloc = htab->elf.irelifunc;
2526 elf_append_rela (output_bfd, sreloc, &outrel);
2527
2528 /* If this reloc is against an external symbol, we
2529 do not want to fiddle with the addend. Otherwise,
2530 we need to include the symbol value so that it
2531 becomes an addend for the dynamic reloc. For an
2532 internal symbol, we have updated addend. */
2533 continue;
2534 }
2535 }
2536
2537 if ((bfd_link_pic (info)
2538 && (h == NULL
2539 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2540 && !resolved_to_zero)
2541 || h->root.type != bfd_link_hash_undefweak)
2542 && ((r_type != R_390_PC16
2543 && r_type != R_390_PC12DBL
2544 && r_type != R_390_PC16DBL
2545 && r_type != R_390_PC24DBL
2546 && r_type != R_390_PC32
2547 && r_type != R_390_PC32DBL
2548 && r_type != R_390_PC64)
2549 || !SYMBOL_CALLS_LOCAL (info, h)))
2550 || (ELIMINATE_COPY_RELOCS
2551 && !bfd_link_pic (info)
2552 && h != NULL
2553 && h->dynindx != -1
2554 && !h->non_got_ref
2555 && ((h->def_dynamic
2556 && !h->def_regular)
2557 || h->root.type == bfd_link_hash_undefweak
2558 || h->root.type == bfd_link_hash_undefined)))
2559 {
2560 Elf_Internal_Rela outrel;
2561 bool skip, relocate;
2562 asection *sreloc;
2563 bfd_byte *loc;
2564
2565 /* When generating a shared object, these relocations
2566 are copied into the output file to be resolved at run
2567 time. */
2568 skip = false;
2569 relocate = false;
2570
2571 outrel.r_offset =
2572 _bfd_elf_section_offset (output_bfd, info, input_section,
2573 rel->r_offset);
2574 if (outrel.r_offset == (bfd_vma) -1)
2575 skip = true;
2576 else if (outrel.r_offset == (bfd_vma) -2)
2577 skip = true, relocate = true;
2578
2579 outrel.r_offset += (input_section->output_section->vma
2580 + input_section->output_offset);
2581
2582 if (skip)
2583 memset (&outrel, 0, sizeof outrel);
2584 else if (h != NULL
2585 && h->dynindx != -1
2586 && (r_type == R_390_PC16
2587 || r_type == R_390_PC12DBL
2588 || r_type == R_390_PC16DBL
2589 || r_type == R_390_PC24DBL
2590 || r_type == R_390_PC32
2591 || r_type == R_390_PC32DBL
2592 || r_type == R_390_PC64
2593 || !bfd_link_pic (info)
2594 || !SYMBOLIC_BIND (info, h)
2595 || !h->def_regular))
2596 {
2597 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2598 outrel.r_addend = rel->r_addend;
2599 }
2600 else
2601 {
2602 /* This symbol is local, or marked to become local. */
2603 outrel.r_addend = relocation + rel->r_addend;
2604 if (r_type == R_390_64)
2605 {
2606 relocate = true;
2607 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2608 }
2609 else
2610 {
2611 long sindx;
2612
2613 if (bfd_is_abs_section (sec))
2614 sindx = 0;
2615 else if (sec == NULL || sec->owner == NULL)
2616 {
2617 bfd_set_error(bfd_error_bad_value);
2618 return false;
2619 }
2620 else
2621 {
2622 asection *osec;
2623
2624 osec = sec->output_section;
2625 sindx = elf_section_data (osec)->dynindx;
2626
2627 if (sindx == 0)
2628 {
2629 osec = htab->elf.text_index_section;
2630 sindx = elf_section_data (osec)->dynindx;
2631 }
2632 BFD_ASSERT (sindx != 0);
2633
2634 /* We are turning this relocation into one
2635 against a section symbol, so subtract out
2636 the output section's address but not the
2637 offset of the input section in the output
2638 section. */
2639 outrel.r_addend -= osec->vma;
2640 }
2641 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2642 }
2643 }
2644
2645 sreloc = elf_section_data (input_section)->sreloc;
2646 if (sreloc == NULL)
2647 abort ();
2648
2649 loc = sreloc->contents;
2650 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2651 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2652
2653 /* If this reloc is against an external symbol, we do
2654 not want to fiddle with the addend. Otherwise, we
2655 need to include the symbol value so that it becomes
2656 an addend for the dynamic reloc. */
2657 if (! relocate)
2658 continue;
2659 }
2660
2661 break;
2662
2663 /* Relocations for tls literal pool entries. */
2664 case R_390_TLS_IE64:
2665 if (bfd_link_pic (info))
2666 {
2667 Elf_Internal_Rela outrel;
2668 asection *sreloc;
2669 bfd_byte *loc;
2670
2671 outrel.r_offset = rel->r_offset
2672 + input_section->output_section->vma
2673 + input_section->output_offset;
2674 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2675 sreloc = elf_section_data (input_section)->sreloc;
2676 if (sreloc == NULL)
2677 abort ();
2678 loc = sreloc->contents;
2679 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2680 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2681 }
2682 /* Fall through. */
2683
2684 case R_390_TLS_GD64:
2685 case R_390_TLS_GOTIE64:
2686 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2687 tls_type = GOT_UNKNOWN;
2688 if (h == NULL && local_got_offsets)
2689 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2690 else if (h != NULL)
2691 {
2692 tls_type = elf_s390_hash_entry(h)->tls_type;
2693 if (!bfd_link_pic (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2694 r_type = R_390_TLS_LE64;
2695 }
2696 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2697 r_type = R_390_TLS_IE64;
2698
2699 if (r_type == R_390_TLS_LE64)
2700 {
2701 /* This relocation gets optimized away by the local exec
2702 access optimization. */
2703 BFD_ASSERT (! unresolved_reloc);
2704 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2705 contents + rel->r_offset);
2706 continue;
2707 }
2708
2709 if (htab->elf.sgot == NULL)
2710 abort ();
2711
2712 if (h != NULL)
2713 off = h->got.offset;
2714 else
2715 {
2716 if (local_got_offsets == NULL)
2717 abort ();
2718
2719 off = local_got_offsets[r_symndx];
2720 }
2721
2722 emit_tls_relocs:
2723
2724 if ((off & 1) != 0)
2725 off &= ~1;
2726 else
2727 {
2728 Elf_Internal_Rela outrel;
2729 bfd_byte *loc;
2730 int dr_type, indx;
2731
2732 if (htab->elf.srelgot == NULL)
2733 abort ();
2734
2735 outrel.r_offset = (htab->elf.sgot->output_section->vma
2736 + htab->elf.sgot->output_offset + off);
2737
2738 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2739 if (r_type == R_390_TLS_GD64)
2740 dr_type = R_390_TLS_DTPMOD;
2741 else
2742 dr_type = R_390_TLS_TPOFF;
2743 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2744 outrel.r_addend = relocation - dtpoff_base (info);
2745 else
2746 outrel.r_addend = 0;
2747 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2748 loc = htab->elf.srelgot->contents;
2749 loc += htab->elf.srelgot->reloc_count++
2750 * sizeof (Elf64_External_Rela);
2751 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2752
2753 if (r_type == R_390_TLS_GD64)
2754 {
2755 if (indx == 0)
2756 {
2757 BFD_ASSERT (! unresolved_reloc);
2758 bfd_put_64 (output_bfd,
2759 relocation - dtpoff_base (info),
2760 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2761 }
2762 else
2763 {
2764 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2765 outrel.r_offset += GOT_ENTRY_SIZE;
2766 outrel.r_addend = 0;
2767 htab->elf.srelgot->reloc_count++;
2768 loc += sizeof (Elf64_External_Rela);
2769 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2770 }
2771 }
2772
2773 if (h != NULL)
2774 h->got.offset |= 1;
2775 else
2776 local_got_offsets[r_symndx] |= 1;
2777 }
2778
2779 if (off >= (bfd_vma) -2)
2780 abort ();
2781 if (r_type == ELF64_R_TYPE (rel->r_info))
2782 {
2783 relocation = htab->elf.sgot->output_offset + off;
2784 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2785 relocation += htab->elf.sgot->output_section->vma;
2786 unresolved_reloc = false;
2787 }
2788 else
2789 {
2790 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
2791 contents + rel->r_offset);
2792 continue;
2793 }
2794 break;
2795
2796 case R_390_TLS_GOTIE12:
2797 case R_390_TLS_GOTIE20:
2798 case R_390_TLS_IEENT:
2799 if (h == NULL)
2800 {
2801 if (local_got_offsets == NULL)
2802 abort();
2803 off = local_got_offsets[r_symndx];
2804 if (bfd_link_pic (info))
2805 goto emit_tls_relocs;
2806 }
2807 else
2808 {
2809 off = h->got.offset;
2810 tls_type = elf_s390_hash_entry(h)->tls_type;
2811 if (bfd_link_pic (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2812 goto emit_tls_relocs;
2813 }
2814
2815 if (htab->elf.sgot == NULL)
2816 abort ();
2817
2818 BFD_ASSERT (! unresolved_reloc);
2819 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2820 htab->elf.sgot->contents + off);
2821 relocation = htab->elf.sgot->output_offset + off;
2822 if (r_type == R_390_TLS_IEENT)
2823 relocation += htab->elf.sgot->output_section->vma;
2824 unresolved_reloc = false;
2825 break;
2826
2827 case R_390_TLS_LDM64:
2828 if (! bfd_link_pic (info))
2829 /* The literal pool entry this relocation refers to gets ignored
2830 by the optimized code of the local exec model. Do nothing
2831 and the value will turn out zero. */
2832 continue;
2833
2834 if (htab->elf.sgot == NULL)
2835 abort ();
2836
2837 off = htab->tls_ldm_got.offset;
2838 if (off & 1)
2839 off &= ~1;
2840 else
2841 {
2842 Elf_Internal_Rela outrel;
2843 bfd_byte *loc;
2844
2845 if (htab->elf.srelgot == NULL)
2846 abort ();
2847
2848 outrel.r_offset = (htab->elf.sgot->output_section->vma
2849 + htab->elf.sgot->output_offset + off);
2850
2851 bfd_put_64 (output_bfd, 0,
2852 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2853 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2854 outrel.r_addend = 0;
2855 loc = htab->elf.srelgot->contents;
2856 loc += htab->elf.srelgot->reloc_count++
2857 * sizeof (Elf64_External_Rela);
2858 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2859 htab->tls_ldm_got.offset |= 1;
2860 }
2861 relocation = htab->elf.sgot->output_offset + off;
2862 unresolved_reloc = false;
2863 break;
2864
2865 case R_390_TLS_LE64:
2866 if (bfd_link_dll (info))
2867 {
2868 /* Linking a shared library with non-fpic code requires
2869 a R_390_TLS_TPOFF relocation. */
2870 Elf_Internal_Rela outrel;
2871 asection *sreloc;
2872 bfd_byte *loc;
2873 int indx;
2874
2875 outrel.r_offset = rel->r_offset
2876 + input_section->output_section->vma
2877 + input_section->output_offset;
2878 if (h != NULL && h->dynindx != -1)
2879 indx = h->dynindx;
2880 else
2881 indx = 0;
2882 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2883 if (indx == 0)
2884 outrel.r_addend = relocation - dtpoff_base (info);
2885 else
2886 outrel.r_addend = 0;
2887 sreloc = elf_section_data (input_section)->sreloc;
2888 if (sreloc == NULL)
2889 abort ();
2890 loc = sreloc->contents;
2891 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2892 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2893 }
2894 else
2895 {
2896 BFD_ASSERT (! unresolved_reloc);
2897 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2898 contents + rel->r_offset);
2899 }
2900 continue;
2901
2902 case R_390_TLS_LDO64:
2903 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
2904 relocation -= dtpoff_base (info);
2905 else
2906 /* When converting LDO to LE, we must negate. */
2907 relocation = -tpoff (info, relocation);
2908 break;
2909
2910 /* Relocations for tls instructions. */
2911 case R_390_TLS_LOAD:
2912 case R_390_TLS_GDCALL:
2913 case R_390_TLS_LDCALL:
2914 tls_type = GOT_UNKNOWN;
2915 if (h == NULL && local_got_offsets)
2916 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2917 else if (h != NULL)
2918 tls_type = elf_s390_hash_entry(h)->tls_type;
2919
2920 if (tls_type == GOT_TLS_GD)
2921 continue;
2922
2923 if (r_type == R_390_TLS_LOAD)
2924 {
2925 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
2926 {
2927 /* IE->LE transition. Four valid cases:
2928 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2929 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2930 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2931 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2932 unsigned int insn0, insn1, ry;
2933
2934 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2935 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2936 if (insn1 != 0x0004)
2937 {
2938 invalid_tls_insn (input_bfd, input_section, rel);
2939 return false;
2940 }
2941 if ((insn0 & 0xff00f000) == 0xe3000000)
2942 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2943 ry = (insn0 & 0x000f0000);
2944 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2945 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2946 ry = (insn0 & 0x0000f000) << 4;
2947 else if ((insn0 & 0xff00f000) == 0xe300c000)
2948 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2949 ry = (insn0 & 0x000f0000);
2950 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2951 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2952 ry = (insn0 & 0x0000f000) << 4;
2953 else
2954 {
2955 invalid_tls_insn (input_bfd, input_section, rel);
2956 return false;
2957 }
2958 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2959 insn1 = 0x000d;
2960 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2961 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2962 }
2963 }
2964 else if (r_type == R_390_TLS_GDCALL)
2965 {
2966 unsigned int insn0, insn1;
2967
2968 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2969 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2970 if ((insn0 & 0xffff0000) != 0xc0e50000)
2971 {
2972 invalid_tls_insn (input_bfd, input_section, rel);
2973 return false;
2974 }
2975 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
2976 {
2977 /* GD->LE transition.
2978 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2979 insn0 = 0xc0040000;
2980 insn1 = 0x0000;
2981 }
2982 else
2983 {
2984 /* GD->IE transition.
2985 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2986 insn0 = 0xe322c000;
2987 insn1 = 0x0004;
2988 }
2989 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2990 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2991 }
2992 else if (r_type == R_390_TLS_LDCALL)
2993 {
2994 if (!bfd_link_pic (info))
2995 {
2996 unsigned int insn0, insn1;
2997
2998 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2999 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3000 if ((insn0 & 0xffff0000) != 0xc0e50000)
3001 {
3002 invalid_tls_insn (input_bfd, input_section, rel);
3003 return false;
3004 }
3005 /* LD->LE transition.
3006 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3007 insn0 = 0xc0040000;
3008 insn1 = 0x0000;
3009 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3010 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3011 }
3012 }
3013 continue;
3014
3015 default:
3016 break;
3017 }
3018
3019 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3020 because such sections are not SEC_ALLOC and thus ld.so will
3021 not process them. */
3022 if (unresolved_reloc
3023 && !((input_section->flags & SEC_DEBUGGING) != 0
3024 && h->def_dynamic)
3025 && _bfd_elf_section_offset (output_bfd, info, input_section,
3026 rel->r_offset) != (bfd_vma) -1)
3027 _bfd_error_handler
3028 /* xgettext:c-format */
3029 (_("%pB(%pA+%#" PRIx64 "): "
3030 "unresolvable %s relocation against symbol `%s'"),
3031 input_bfd,
3032 input_section,
3033 (uint64_t) rel->r_offset,
3034 howto->name,
3035 h->root.root.string);
3036
3037 do_relocation:
3038
3039 /* When applying a 24 bit reloc we need to start one byte
3040 earlier. Otherwise the 32 bit get/put bfd operations might
3041 access a byte after the actual section. */
3042 if (r_type == R_390_PC24DBL
3043 || r_type == R_390_PLT24DBL)
3044 rel->r_offset--;
3045
3046 if (r_type == R_390_20
3047 || r_type == R_390_GOT20
3048 || r_type == R_390_GOTPLT20
3049 || r_type == R_390_TLS_GOTIE20)
3050 {
3051 relocation += rel->r_addend;
3052 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3053 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3054 contents, rel->r_offset,
3055 relocation, 0);
3056 }
3057 else
3058 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3059 contents, rel->r_offset,
3060 relocation, rel->r_addend);
3061
3062 if (r != bfd_reloc_ok)
3063 {
3064 const char *name;
3065
3066 if (h != NULL)
3067 name = h->root.root.string;
3068 else
3069 {
3070 name = bfd_elf_string_from_elf_section (input_bfd,
3071 symtab_hdr->sh_link,
3072 sym->st_name);
3073 if (name == NULL)
3074 return false;
3075 if (*name == '\0')
3076 name = bfd_section_name (sec);
3077 }
3078
3079 if (r == bfd_reloc_overflow)
3080 (*info->callbacks->reloc_overflow)
3081 (info, (h ? &h->root : NULL), name, howto->name,
3082 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3083 else
3084 {
3085 _bfd_error_handler
3086 /* xgettext:c-format */
3087 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3088 input_bfd, input_section,
3089 (uint64_t) rel->r_offset, name, (int) r);
3090 return false;
3091 }
3092 }
3093 }
3094
3095 return true;
3096 }
3097
3098 /* Generate the PLT slots together with the dynamic relocations needed
3099 for IFUNC symbols. */
3100
3101 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)3102 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3103 struct bfd_link_info *info,
3104 struct elf_link_hash_entry *h,
3105 struct elf_s390_link_hash_table *htab,
3106 bfd_vma plt_offset,
3107 bfd_vma resolver_address)
3108 {
3109 bfd_vma plt_index;
3110 bfd_vma got_offset;
3111 Elf_Internal_Rela rela;
3112 bfd_byte *loc;
3113 asection *plt, *gotplt, *relplt;
3114
3115 if (htab->elf.iplt == NULL
3116 || htab->elf.igotplt == NULL
3117 || htab->elf.irelplt == NULL)
3118 abort ();
3119
3120 /* Index of the PLT slot within iplt section. */
3121 plt_index = plt_offset / PLT_ENTRY_SIZE;
3122 plt = htab->elf.iplt;
3123 /* Offset into the igot.plt section. */
3124 got_offset = plt_index * GOT_ENTRY_SIZE;
3125 gotplt = htab->elf.igotplt;
3126 relplt = htab->elf.irelplt;
3127
3128 /* Fill in the blueprint of a PLT. */
3129 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
3130 PLT_ENTRY_SIZE);
3131
3132 /* Fixup the relative address to the GOT entry */
3133 bfd_put_32 (output_bfd,
3134 (gotplt->output_section->vma +
3135 gotplt->output_offset + got_offset
3136 - (plt->output_section->vma +
3137 plt->output_offset +
3138 plt_offset))/2,
3139 plt->contents + plt_offset + 2);
3140 /* Fixup the relative branch to PLT 0 */
3141 bfd_put_32 (output_bfd, - (plt->output_offset +
3142 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3143 plt->contents + plt_offset + 24);
3144 /* Fixup offset into .rela.plt section. */
3145 bfd_put_32 (output_bfd, relplt->output_offset +
3146 plt_index * sizeof (Elf64_External_Rela),
3147 plt->contents + plt_offset + 28);
3148
3149 /* Fill in the entry in the global offset table.
3150 Points to instruction after GOT offset. */
3151 bfd_put_64 (output_bfd,
3152 (plt->output_section->vma
3153 + plt->output_offset
3154 + plt_offset
3155 + 14),
3156 gotplt->contents + got_offset);
3157
3158 /* Fill in the entry in the .rela.plt section. */
3159 rela.r_offset = (gotplt->output_section->vma
3160 + gotplt->output_offset
3161 + got_offset);
3162
3163 if (!h
3164 || h->dynindx == -1
3165 || ((bfd_link_executable (info)
3166 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3167 && h->def_regular))
3168 {
3169 /* The symbol can be locally resolved. */
3170 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
3171 rela.r_addend = resolver_address;
3172 }
3173 else
3174 {
3175 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3176 rela.r_addend = 0;
3177 }
3178
3179 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3180 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3181 }
3182
3183
3184 /* Finish up dynamic symbol handling. We set the contents of various
3185 dynamic sections here. */
3186
3187 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)3188 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3189 struct bfd_link_info *info,
3190 struct elf_link_hash_entry *h,
3191 Elf_Internal_Sym *sym)
3192 {
3193 struct elf_s390_link_hash_table *htab;
3194 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3195
3196 htab = elf_s390_hash_table (info);
3197 if (htab == NULL)
3198 return false;
3199
3200 if (h->plt.offset != (bfd_vma) -1)
3201 {
3202 bfd_vma plt_index;
3203 bfd_vma gotplt_offset;
3204 Elf_Internal_Rela rela;
3205 bfd_byte *loc;
3206
3207 /* This symbol has an entry in the procedure linkage table. Set
3208 it up. */
3209 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3210 {
3211 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3212 htab, h->plt.offset,
3213 eh->ifunc_resolver_address +
3214 eh->ifunc_resolver_section->output_offset +
3215 eh->ifunc_resolver_section->output_section->vma);
3216
3217 /* Do not return yet. Handling of explicit GOT slots of
3218 IFUNC symbols is below. */
3219 }
3220 else
3221 {
3222 if (h->dynindx == -1
3223 || htab->elf.splt == NULL
3224 || htab->elf.sgotplt == NULL
3225 || htab->elf.srelplt == NULL)
3226 abort ();
3227
3228 /* Calc. index no.
3229 Current offset - size first entry / entry size. */
3230 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3231
3232 /* The slots in the .got.plt correspond to the PLT slots in
3233 the same order. */
3234 gotplt_offset = plt_index * GOT_ENTRY_SIZE;
3235
3236 /* If .got.plt comes first it needs to contain the 3 header
3237 entries. */
3238 if (!s390_gotplt_after_got_p (info))
3239 gotplt_offset += 3 * GOT_ENTRY_SIZE;
3240
3241 /* Fill in the blueprint of a PLT. */
3242 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
3243 PLT_ENTRY_SIZE);
3244
3245 /* The first instruction in the PLT entry is a LARL loading
3246 the address of the GOT slot. We write the 4 byte
3247 immediate operand of the LARL instruction here. */
3248 bfd_put_32 (output_bfd,
3249 (htab->elf.sgotplt->output_section->vma +
3250 htab->elf.sgotplt->output_offset + gotplt_offset
3251 - (htab->elf.splt->output_section->vma +
3252 htab->elf.splt->output_offset +
3253 h->plt.offset))/2,
3254 htab->elf.splt->contents + h->plt.offset + 2);
3255 /* Fixup the relative branch to PLT 0 */
3256 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3257 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3258 htab->elf.splt->contents + h->plt.offset + 24);
3259 /* Fixup offset into .rela.plt section. */
3260 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3261 htab->elf.splt->contents + h->plt.offset + 28);
3262
3263 /* Fill in the entry in the global offset table.
3264 Points to instruction after GOT offset. */
3265 bfd_put_64 (output_bfd,
3266 (htab->elf.splt->output_section->vma
3267 + htab->elf.splt->output_offset
3268 + h->plt.offset
3269 + 14),
3270 htab->elf.sgotplt->contents + gotplt_offset);
3271
3272 /* Fill in the entry in the .rela.plt section. */
3273 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3274 + htab->elf.sgotplt->output_offset
3275 + gotplt_offset);
3276 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3277 rela.r_addend = 0;
3278 loc = htab->elf.srelplt->contents + plt_index *
3279 sizeof (Elf64_External_Rela);
3280 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3281
3282 if (!h->def_regular)
3283 {
3284 /* Mark the symbol as undefined, rather than as defined in
3285 the .plt section. Leave the value alone. This is a clue
3286 for the dynamic linker, to make function pointer
3287 comparisons work between an application and shared
3288 library. */
3289 sym->st_shndx = SHN_UNDEF;
3290 }
3291 }
3292 }
3293
3294 if (h->got.offset != (bfd_vma) -1
3295 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3296 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3297 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3298 {
3299 Elf_Internal_Rela rela;
3300 bfd_byte *loc;
3301
3302 /* This symbol has an entry in the global offset table. Set it
3303 up. */
3304 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3305 abort ();
3306
3307 rela.r_offset = (htab->elf.sgot->output_section->vma
3308 + htab->elf.sgot->output_offset
3309 + (h->got.offset &~ (bfd_vma) 1));
3310
3311 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3312 {
3313 if (bfd_link_pic (info))
3314 {
3315 /* An explicit GOT slot usage needs GLOB_DAT. If the
3316 symbol references local the implicit got.iplt slot
3317 will be used and the IRELATIVE reloc has been created
3318 above. */
3319 goto do_glob_dat;
3320 }
3321 else
3322 {
3323 /* For non-shared objects explicit GOT slots must be
3324 filled with the PLT slot address for pointer
3325 equality reasons. */
3326 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
3327 + htab->elf.iplt->output_offset
3328 + h->plt.offset),
3329 htab->elf.sgot->contents + h->got.offset);
3330 return true;
3331 }
3332 }
3333 else if (bfd_link_pic (info)
3334 && SYMBOL_REFERENCES_LOCAL (info, h))
3335 {
3336 if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
3337 return true;
3338
3339 /* If this is a static link, or it is a -Bsymbolic link and
3340 the symbol is defined locally or was forced to be local
3341 because of a version file, we just want to emit a
3342 RELATIVE reloc. The entry in the global offset table
3343 will already have been initialized in the
3344 relocate_section function. */
3345 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
3346 return false;
3347 BFD_ASSERT((h->got.offset & 1) != 0);
3348 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3349 rela.r_addend = (h->root.u.def.value
3350 + h->root.u.def.section->output_section->vma
3351 + h->root.u.def.section->output_offset);
3352 }
3353 else
3354 {
3355 BFD_ASSERT((h->got.offset & 1) == 0);
3356 do_glob_dat:
3357 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3358 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3359 rela.r_addend = 0;
3360 }
3361
3362 loc = htab->elf.srelgot->contents;
3363 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3364 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3365 }
3366
3367 if (h->needs_copy)
3368 {
3369 Elf_Internal_Rela rela;
3370 asection *s;
3371 bfd_byte *loc;
3372
3373 /* This symbols needs a copy reloc. Set it up. */
3374
3375 if (h->dynindx == -1
3376 || (h->root.type != bfd_link_hash_defined
3377 && h->root.type != bfd_link_hash_defweak)
3378 || htab->elf.srelbss == NULL)
3379 abort ();
3380
3381 rela.r_offset = (h->root.u.def.value
3382 + h->root.u.def.section->output_section->vma
3383 + h->root.u.def.section->output_offset);
3384 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3385 rela.r_addend = 0;
3386 if (h->root.u.def.section == htab->elf.sdynrelro)
3387 s = htab->elf.sreldynrelro;
3388 else
3389 s = htab->elf.srelbss;
3390 loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela);
3391 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3392 }
3393
3394 /* Mark some specially defined symbols as absolute. */
3395 if (h == htab->elf.hdynamic
3396 || h == htab->elf.hgot
3397 || h == htab->elf.hplt)
3398 sym->st_shndx = SHN_ABS;
3399
3400 return true;
3401 }
3402
3403 /* Used to decide how to sort relocs in an optimal manner for the
3404 dynamic linker, before writing them out. */
3405
3406 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)3407 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3408 const asection *rel_sec ATTRIBUTE_UNUSED,
3409 const Elf_Internal_Rela *rela)
3410 {
3411 bfd *abfd = info->output_bfd;
3412 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3413 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3414 unsigned long r_symndx = ELF64_R_SYM (rela->r_info);
3415 Elf_Internal_Sym sym;
3416
3417 if (htab->elf.dynsym == NULL
3418 || !bed->s->swap_symbol_in (abfd,
3419 (htab->elf.dynsym->contents
3420 + r_symndx * bed->s->sizeof_sym),
3421 0, &sym))
3422 abort ();
3423
3424 /* Check relocation against STT_GNU_IFUNC symbol. */
3425 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3426 return reloc_class_ifunc;
3427
3428 switch ((int) ELF64_R_TYPE (rela->r_info))
3429 {
3430 case R_390_RELATIVE:
3431 return reloc_class_relative;
3432 case R_390_JMP_SLOT:
3433 return reloc_class_plt;
3434 case R_390_COPY:
3435 return reloc_class_copy;
3436 default:
3437 return reloc_class_normal;
3438 }
3439 }
3440
3441 /* Finish up the dynamic sections. */
3442
3443 static bool
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3444 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3445 struct bfd_link_info *info)
3446 {
3447 struct elf_s390_link_hash_table *htab;
3448 bfd *dynobj;
3449 asection *sdyn;
3450 bfd *ibfd;
3451 unsigned int i;
3452
3453 htab = elf_s390_hash_table (info);
3454 if (htab == NULL)
3455 return false;
3456
3457 dynobj = htab->elf.dynobj;
3458 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3459
3460 if (htab->elf.dynamic_sections_created)
3461 {
3462 Elf64_External_Dyn *dyncon, *dynconend;
3463
3464 if (sdyn == NULL || htab->elf.sgot == NULL)
3465 abort ();
3466
3467 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3468 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3469 for (; dyncon < dynconend; dyncon++)
3470 {
3471 Elf_Internal_Dyn dyn;
3472 asection *s;
3473
3474 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3475
3476 switch (dyn.d_tag)
3477 {
3478 default:
3479 continue;
3480
3481 case DT_PLTGOT:
3482 /* DT_PLTGOT matches _GLOBAL_OFFSET_TABLE_ */
3483 dyn.d_un.d_ptr = s390_got_pointer (info);
3484 break;
3485
3486 case DT_JMPREL:
3487 s = htab->elf.srelplt;
3488 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3489 break;
3490
3491 case DT_PLTRELSZ:
3492 dyn.d_un.d_val = htab->elf.srelplt->size;
3493 if (htab->elf.irelplt)
3494 dyn.d_un.d_val += htab->elf.irelplt->size;
3495 break;
3496
3497 case DT_RELASZ:
3498 /* The procedure linkage table relocs (DT_JMPREL) should
3499 not be included in the overall relocs (DT_RELA).
3500 Therefore, we override the DT_RELASZ entry here to
3501 make it not include the JMPREL relocs. Since the
3502 linker script arranges for .rela.plt to follow all
3503 other relocation sections, we don't have to worry
3504 about changing the DT_RELA entry. */
3505 dyn.d_un.d_val -= htab->elf.srelplt->size;
3506 if (htab->elf.irelplt)
3507 dyn.d_un.d_val -= htab->elf.irelplt->size;
3508 break;
3509 }
3510
3511 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3512 }
3513
3514 /* Fill in the special first entry in the procedure linkage table. */
3515 if (htab->elf.splt && htab->elf.splt->size > 0)
3516 {
3517 /* fill in blueprint for plt 0 entry */
3518 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
3519 PLT_FIRST_ENTRY_SIZE);
3520 /* The second instruction in the first PLT entry is a LARL
3521 loading the GOT pointer. Fill in the LARL immediate
3522 address. */
3523 bfd_put_32 (output_bfd,
3524 (s390_got_pointer (info)
3525 - htab->elf.splt->output_section->vma
3526 - htab->elf.splt->output_offset - 6)/2,
3527 htab->elf.splt->contents + 8);
3528 }
3529 if (elf_section_data (htab->elf.splt->output_section) != NULL)
3530 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
3531 = PLT_ENTRY_SIZE;
3532 }
3533
3534 if (htab->elf.hgot && htab->elf.hgot->root.u.def.section)
3535 {
3536 /* Fill in the first three entries in the global offset table. */
3537 if (htab->elf.hgot->root.u.def.section->size > 0)
3538 {
3539 bfd_put_64 (output_bfd,
3540 (sdyn == NULL ? (bfd_vma) 0
3541 : sdyn->output_section->vma + sdyn->output_offset),
3542 htab->elf.hgot->root.u.def.section->contents);
3543 /* One entry for shared object struct ptr. */
3544 bfd_put_64 (output_bfd, (bfd_vma) 0,
3545 htab->elf.hgot->root.u.def.section->contents + 8);
3546 /* One entry for _dl_runtime_resolve. */
3547 bfd_put_64 (output_bfd, (bfd_vma) 0,
3548 htab->elf.hgot->root.u.def.section->contents + 16);
3549 }
3550 if (htab->elf.sgot != NULL && htab->elf.sgot->size > 0)
3551 elf_section_data (htab->elf.sgot->output_section)
3552 ->this_hdr.sh_entsize = 8;
3553 }
3554
3555 /* Finish dynamic symbol for local IFUNC symbols. */
3556 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3557 {
3558 struct plt_entry *local_plt;
3559 Elf_Internal_Sym *isym;
3560 Elf_Internal_Shdr *symtab_hdr;
3561
3562 symtab_hdr = &elf_symtab_hdr (ibfd);
3563
3564 if (!is_s390_elf (ibfd))
3565 continue;
3566
3567 local_plt = elf_s390_local_plt (ibfd);
3568 if (local_plt != NULL)
3569 for (i = 0; i < symtab_hdr->sh_info; i++)
3570 {
3571 if (local_plt[i].plt.offset != (bfd_vma) -1)
3572 {
3573 asection *sec = local_plt[i].sec;
3574 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i);
3575 if (isym == NULL)
3576 return false;
3577
3578 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3579 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3580 local_plt[i].plt.offset,
3581 isym->st_value
3582 + sec->output_section->vma
3583 + sec->output_offset);
3584
3585 }
3586 }
3587 }
3588
3589 return true;
3590 }
3591
3592 /* Support for core dump NOTE sections. */
3593
3594 static bool
elf_s390_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)3595 elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3596 {
3597 int offset;
3598 size_t size;
3599
3600 switch (note->descsz)
3601 {
3602 default:
3603 return false;
3604
3605 case 336: /* sizeof(struct elf_prstatus) on s390x */
3606 /* pr_cursig */
3607 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3608
3609 /* pr_pid */
3610 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);
3611
3612 /* pr_reg */
3613 offset = 112;
3614 size = 216;
3615 break;
3616 }
3617
3618 /* Make a ".reg/999" section. */
3619 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3620 size, note->descpos + offset);
3621 }
3622
3623 static bool
elf_s390_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)3624 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3625 {
3626 switch (note->descsz)
3627 {
3628 default:
3629 return false;
3630
3631 case 136: /* sizeof(struct elf_prpsinfo) on s390x */
3632 elf_tdata (abfd)->core->pid
3633 = bfd_get_32 (abfd, note->descdata + 24);
3634 elf_tdata (abfd)->core->program
3635 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
3636 elf_tdata (abfd)->core->command
3637 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
3638 }
3639
3640 /* Note that for some reason, a spurious space is tacked
3641 onto the end of the args in some (at least one anyway)
3642 implementations, so strip it off if it exists. */
3643
3644 {
3645 char *command = elf_tdata (abfd)->core->command;
3646 int n = strlen (command);
3647
3648 if (0 < n && command[n - 1] == ' ')
3649 command[n - 1] = '\0';
3650 }
3651
3652 return true;
3653 }
3654
3655 static char *
elf_s390_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)3656 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3657 int note_type, ...)
3658 {
3659 va_list ap;
3660
3661 switch (note_type)
3662 {
3663 default:
3664 return NULL;
3665
3666 case NT_PRPSINFO:
3667 {
3668 char data[136] ATTRIBUTE_NONSTRING = { 0 };
3669 const char *fname, *psargs;
3670
3671 va_start (ap, note_type);
3672 fname = va_arg (ap, const char *);
3673 psargs = va_arg (ap, const char *);
3674 va_end (ap);
3675
3676 strncpy (data + 40, fname, 16);
3677 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3678 DIAGNOSTIC_PUSH;
3679 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
3680 -Wstringop-truncation:
3681 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
3682 */
3683 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
3684 #endif
3685 strncpy (data + 56, psargs, 80);
3686 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3687 DIAGNOSTIC_POP;
3688 #endif
3689 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3690 &data, sizeof (data));
3691 }
3692
3693 case NT_PRSTATUS:
3694 {
3695 char data[336] = { 0 };
3696 long pid;
3697 int cursig;
3698 const void *gregs;
3699
3700 va_start (ap, note_type);
3701 pid = va_arg (ap, long);
3702 cursig = va_arg (ap, int);
3703 gregs = va_arg (ap, const void *);
3704 va_end (ap);
3705
3706 bfd_put_16 (abfd, cursig, data + 12);
3707 bfd_put_32 (abfd, pid, data + 32);
3708 memcpy (data + 112, gregs, 216);
3709 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3710 &data, sizeof (data));
3711 }
3712 }
3713 /* NOTREACHED */
3714 }
3715
3716 /* Return address for Ith PLT stub in section PLT, for relocation REL
3717 or (bfd_vma) -1 if it should not be included. */
3718
3719 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3720 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3721 const arelent *rel ATTRIBUTE_UNUSED)
3722 {
3723 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3724 }
3725
3726 /* Merge backend specific data from an object file to the output
3727 object file when linking. */
3728
3729 static bool
elf64_s390_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)3730 elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3731 {
3732 if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd))
3733 return true;
3734
3735 return elf_s390_merge_obj_attributes (ibfd, info);
3736 }
3737
3738 /* We may add a PT_S390_PGSTE program header. */
3739
3740 static int
elf_s390_additional_program_headers(bfd * abfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)3741 elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED,
3742 struct bfd_link_info *info)
3743 {
3744 struct elf_s390_link_hash_table *htab;
3745
3746 if (info)
3747 {
3748 htab = elf_s390_hash_table (info);
3749 if (htab)
3750 return htab->params->pgste;
3751 }
3752 return 0;
3753 }
3754
3755
3756 /* Add the PT_S390_PGSTE program header. */
3757
3758 static bool
elf_s390_modify_segment_map(bfd * abfd,struct bfd_link_info * info)3759 elf_s390_modify_segment_map (bfd *abfd, struct bfd_link_info *info)
3760 {
3761 struct elf_s390_link_hash_table *htab;
3762 struct elf_segment_map *m, *pm = NULL;
3763
3764 if (!abfd || !info)
3765 return true;
3766
3767 htab = elf_s390_hash_table (info);
3768 if (!htab || !htab->params->pgste)
3769 return true;
3770
3771 /* If there is already a PT_S390_PGSTE header, avoid adding
3772 another. */
3773 m = elf_seg_map (abfd);
3774 while (m && m->p_type != PT_S390_PGSTE)
3775 {
3776 pm = m;
3777 m = m->next;
3778 }
3779
3780 if (m)
3781 return true;
3782
3783 m = (struct elf_segment_map *)
3784 bfd_zalloc (abfd, sizeof (struct elf_segment_map));
3785 if (m == NULL)
3786 return false;
3787 m->p_type = PT_S390_PGSTE;
3788 m->count = 0;
3789 m->next = NULL;
3790 if (pm)
3791 pm->next = m;
3792
3793 return true;
3794 }
3795
3796 bool
bfd_elf_s390_set_options(struct bfd_link_info * info,struct s390_elf_params * params)3797 bfd_elf_s390_set_options (struct bfd_link_info *info,
3798 struct s390_elf_params *params)
3799 {
3800 struct elf_s390_link_hash_table *htab;
3801
3802 if (info)
3803 {
3804 htab = elf_s390_hash_table (info);
3805 if (htab)
3806 htab->params = params;
3807 }
3808
3809 return true;
3810 }
3811
3812
3813 /* Why was the hash table entry size definition changed from
3814 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3815 this is the only reason for the s390_elf64_size_info structure. */
3816
3817 const struct elf_size_info s390_elf64_size_info =
3818 {
3819 sizeof (Elf64_External_Ehdr),
3820 sizeof (Elf64_External_Phdr),
3821 sizeof (Elf64_External_Shdr),
3822 sizeof (Elf64_External_Rel),
3823 sizeof (Elf64_External_Rela),
3824 sizeof (Elf64_External_Sym),
3825 sizeof (Elf64_External_Dyn),
3826 sizeof (Elf_External_Note),
3827 8, /* hash-table entry size. */
3828 1, /* internal relocations per external relocations. */
3829 64, /* arch_size. */
3830 3, /* log_file_align. */
3831 ELFCLASS64, EV_CURRENT,
3832 bfd_elf64_write_out_phdrs,
3833 bfd_elf64_write_shdrs_and_ehdr,
3834 bfd_elf64_checksum_contents,
3835 bfd_elf64_write_relocs,
3836 bfd_elf64_swap_symbol_in,
3837 bfd_elf64_swap_symbol_out,
3838 bfd_elf64_slurp_reloc_table,
3839 bfd_elf64_slurp_symbol_table,
3840 bfd_elf64_swap_dyn_in,
3841 bfd_elf64_swap_dyn_out,
3842 bfd_elf64_swap_reloc_in,
3843 bfd_elf64_swap_reloc_out,
3844 bfd_elf64_swap_reloca_in,
3845 bfd_elf64_swap_reloca_out
3846 };
3847
3848 #define TARGET_BIG_SYM s390_elf64_vec
3849 #define TARGET_BIG_NAME "elf64-s390"
3850 #define ELF_ARCH bfd_arch_s390
3851 #define ELF_TARGET_ID S390_ELF_DATA
3852 #define ELF_MACHINE_CODE EM_S390
3853 #define ELF_MACHINE_ALT1 EM_S390_OLD
3854 #define ELF_MAXPAGESIZE 0x1000
3855
3856 #define elf_backend_size_info s390_elf64_size_info
3857
3858 #define elf_backend_can_gc_sections 1
3859 #define elf_backend_can_refcount 1
3860 #define elf_backend_want_got_plt 1
3861 #define elf_backend_plt_readonly 1
3862 #define elf_backend_want_plt_sym 0
3863 #define elf_backend_got_header_size 24
3864 #define elf_backend_want_dynrelro 1
3865 #define elf_backend_rela_normal 1
3866
3867 #define elf_info_to_howto elf_s390_info_to_howto
3868
3869 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3870 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3871 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3872 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3873 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data
3874
3875 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3876 #define elf_backend_check_relocs elf_s390_check_relocs
3877 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3878 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3879 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3880 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3881 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3882 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3883 #define elf_backend_relocate_section elf_s390_relocate_section
3884 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3885 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3886 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3887 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
3888 #define elf_backend_write_core_note elf_s390_write_core_note
3889 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3890 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
3891 #define elf_backend_additional_program_headers elf_s390_additional_program_headers
3892 #define elf_backend_modify_segment_map elf_s390_modify_segment_map
3893
3894 #define bfd_elf64_mkobject elf_s390_mkobject
3895 #define elf_backend_object_p elf_s390_object_p
3896
3897 #include "elf64-target.h"
3898