1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright (C) 2000-2024 Free Software Foundation, Inc.
3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/s390.h"
28 #include "elf-s390.h"
29 #include <stdarg.h>
30
31 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
32 from smaller values. Start with zero, widen, *then* decrement. */
33 #define MINUS_ONE (((bfd_vma)0) - 1)
34
35 static bfd_reloc_status_type
36 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
37 asection *, bfd *, char **);
38 static bfd_reloc_status_type
39 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
40 asection *, bfd *, char **);
41
42 /* The relocation "howto" table. */
43 static reloc_howto_type elf_howto_table[] =
44 {
45 HOWTO (R_390_NONE, /* type */
46 0, /* rightshift */
47 0, /* size */
48 0, /* bitsize */
49 false, /* pc_relative */
50 0, /* bitpos */
51 complain_overflow_dont, /* complain_on_overflow */
52 bfd_elf_generic_reloc, /* special_function */
53 "R_390_NONE", /* name */
54 false, /* partial_inplace */
55 0, /* src_mask */
56 0, /* dst_mask */
57 false), /* pcrel_offset */
58
59 HOWTO(R_390_8, 0, 1, 8, false, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
61 HOWTO(R_390_12, 0, 2, 12, false, 0, complain_overflow_dont,
62 bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
63 HOWTO(R_390_16, 0, 2, 16, false, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
65 HOWTO(R_390_32, 0, 4, 32, false, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
67 HOWTO(R_390_PC32, 0, 4, 32, true, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
69 HOWTO(R_390_GOT12, 0, 2, 12, false, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
71 HOWTO(R_390_GOT32, 0, 4, 32, false, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
73 HOWTO(R_390_PLT32, 0, 4, 32, true, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
75 HOWTO(R_390_COPY, 0, 8, 64, false, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
77 HOWTO(R_390_GLOB_DAT, 0, 8, 64, false, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_390_GLOB_DAT", false, 0,MINUS_ONE, false),
79 HOWTO(R_390_JMP_SLOT, 0, 8, 64, false, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_390_JMP_SLOT", false, 0,MINUS_ONE, false),
81 HOWTO(R_390_RELATIVE, 0, 8, 64, true, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_390_RELATIVE", false, 0,MINUS_ONE, false),
83 HOWTO(R_390_GOTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_390_GOTOFF32", false, 0,MINUS_ONE, false),
85 HOWTO(R_390_GOTPC, 0, 8, 64, true, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
87 HOWTO(R_390_GOT16, 0, 2, 16, false, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
89 HOWTO(R_390_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
91 HOWTO(R_390_PC16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
93 HOWTO(R_390_PLT16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
95 HOWTO(R_390_PC32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
97 HOWTO(R_390_PLT32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
99 HOWTO(R_390_GOTPCDBL, 1, 4, 32, true, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
101 HOWTO(R_390_64, 0, 8, 64, false, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
103 HOWTO(R_390_PC64, 0, 8, 64, true, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
105 HOWTO(R_390_GOT64, 0, 8, 64, false, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
107 HOWTO(R_390_PLT64, 0, 8, 64, true, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
109 HOWTO(R_390_GOTENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
111 HOWTO(R_390_GOTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_390_GOTOFF16", false, 0,0x0000ffff, false),
113 HOWTO(R_390_GOTOFF64, 0, 8, 64, false, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_390_GOTOFF64", false, 0,MINUS_ONE, false),
115 HOWTO(R_390_GOTPLT12, 0, 2, 12, false, 0, complain_overflow_dont,
116 bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false),
117 HOWTO(R_390_GOTPLT16, 0, 2, 16, false, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false),
119 HOWTO(R_390_GOTPLT32, 0, 4, 32, false, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_GOTPLT32", false, 0,0xffffffff, false),
121 HOWTO(R_390_GOTPLT64, 0, 8, 64, false, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_GOTPLT64", false, 0,MINUS_ONE, false),
123 HOWTO(R_390_GOTPLTENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_GOTPLTENT",false, 0,MINUS_ONE, true),
125 HOWTO(R_390_PLTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false),
127 HOWTO(R_390_PLTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_PLTOFF32", false, 0,0xffffffff, false),
129 HOWTO(R_390_PLTOFF64, 0, 8, 64, false, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_390_PLTOFF64", false, 0,MINUS_ONE, false),
131 HOWTO(R_390_TLS_LOAD, 0, 0, 0, false, 0, complain_overflow_dont,
132 s390_tls_reloc, "R_390_TLS_LOAD", false, 0, 0, false),
133 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
134 s390_tls_reloc, "R_390_TLS_GDCALL", false, 0, 0, false),
135 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
136 s390_tls_reloc, "R_390_TLS_LDCALL", false, 0, 0, false),
137 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
138 HOWTO(R_390_TLS_GD64, 0, 8, 64, false, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_TLS_GD64", false, 0, MINUS_ONE, false),
140 HOWTO(R_390_TLS_GOTIE12, 0, 2, 12, false, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", false, 0, 0x00000fff, false),
142 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
143 HOWTO(R_390_TLS_GOTIE64, 0, 8, 64, false, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", false, 0, MINUS_ONE, false),
145 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
146 HOWTO(R_390_TLS_LDM64, 0, 8, 64, false, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_TLS_LDM64", false, 0, MINUS_ONE, false),
148 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
149 HOWTO(R_390_TLS_IE64, 0, 8, 64, false, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_TLS_IE64", false, 0, MINUS_ONE, false),
151 HOWTO(R_390_TLS_IEENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_390_TLS_IEENT", false, 0, MINUS_ONE, true),
153 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
154 HOWTO(R_390_TLS_LE64, 0, 4, 32, false, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_TLS_LE64", false, 0, MINUS_ONE, false),
156 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
157 HOWTO(R_390_TLS_LDO64, 0, 8, 64, false, 0, complain_overflow_bitfield,
158 bfd_elf_generic_reloc, "R_390_TLS_LDO64", false, 0, MINUS_ONE, false),
159 HOWTO(R_390_TLS_DTPMOD, 0, 8, 64, false, 0, complain_overflow_bitfield,
160 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", false, 0, MINUS_ONE, false),
161 HOWTO(R_390_TLS_DTPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", false, 0, MINUS_ONE, false),
163 HOWTO(R_390_TLS_TPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", false, 0, MINUS_ONE, false),
165 HOWTO(R_390_20, 0, 4, 20, false, 8, complain_overflow_dont,
166 s390_elf_ldisp_reloc, "R_390_20", false, 0,0x0fffff00, false),
167 HOWTO(R_390_GOT20, 0, 4, 20, false, 8, complain_overflow_dont,
168 s390_elf_ldisp_reloc, "R_390_GOT20", false, 0,0x0fffff00, false),
169 HOWTO(R_390_GOTPLT20, 0, 4, 20, false, 8, complain_overflow_dont,
170 s390_elf_ldisp_reloc, "R_390_GOTPLT20", false, 0,0x0fffff00, false),
171 HOWTO(R_390_TLS_GOTIE20, 0, 4, 20, false, 8, complain_overflow_dont,
172 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", false, 0,0x0fffff00, false),
173 HOWTO(R_390_IRELATIVE, 0, 8, 64, false, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_390_IRELATIVE", false, 0, MINUS_ONE, false),
175 HOWTO(R_390_PC12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_PC12DBL", false, 0,0x00000fff, true),
177 HOWTO(R_390_PLT12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true),
179 HOWTO(R_390_PC24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield,
180 bfd_elf_generic_reloc, "R_390_PC24DBL", false, 0,0x00ffffff, true),
181 HOWTO(R_390_PLT24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_390_PLT24DBL", false, 0,0x00ffffff, true),
183 };
184
185 /* GNU extension to record C++ vtable hierarchy. */
186 static reloc_howto_type elf64_s390_vtinherit_howto =
187 HOWTO (R_390_GNU_VTINHERIT, 0,8,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
188 static reloc_howto_type elf64_s390_vtentry_howto =
189 HOWTO (R_390_GNU_VTENTRY, 0,8,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
190
191 static reloc_howto_type *
elf_s390_reloc_type_lookup(bfd * abfd,bfd_reloc_code_real_type code)192 elf_s390_reloc_type_lookup (bfd *abfd,
193 bfd_reloc_code_real_type code)
194 {
195 switch (code)
196 {
197 case BFD_RELOC_NONE:
198 return &elf_howto_table[(int) R_390_NONE];
199 case BFD_RELOC_8:
200 return &elf_howto_table[(int) R_390_8];
201 case BFD_RELOC_390_12:
202 return &elf_howto_table[(int) R_390_12];
203 case BFD_RELOC_16:
204 return &elf_howto_table[(int) R_390_16];
205 case BFD_RELOC_32:
206 return &elf_howto_table[(int) R_390_32];
207 case BFD_RELOC_CTOR:
208 return &elf_howto_table[(int) R_390_32];
209 case BFD_RELOC_32_PCREL:
210 return &elf_howto_table[(int) R_390_PC32];
211 case BFD_RELOC_390_GOT12:
212 return &elf_howto_table[(int) R_390_GOT12];
213 case BFD_RELOC_32_GOT_PCREL:
214 return &elf_howto_table[(int) R_390_GOT32];
215 case BFD_RELOC_390_PLT32:
216 return &elf_howto_table[(int) R_390_PLT32];
217 case BFD_RELOC_390_COPY:
218 return &elf_howto_table[(int) R_390_COPY];
219 case BFD_RELOC_390_GLOB_DAT:
220 return &elf_howto_table[(int) R_390_GLOB_DAT];
221 case BFD_RELOC_390_JMP_SLOT:
222 return &elf_howto_table[(int) R_390_JMP_SLOT];
223 case BFD_RELOC_390_RELATIVE:
224 return &elf_howto_table[(int) R_390_RELATIVE];
225 case BFD_RELOC_32_GOTOFF:
226 return &elf_howto_table[(int) R_390_GOTOFF32];
227 case BFD_RELOC_390_GOTPC:
228 return &elf_howto_table[(int) R_390_GOTPC];
229 case BFD_RELOC_390_GOT16:
230 return &elf_howto_table[(int) R_390_GOT16];
231 case BFD_RELOC_16_PCREL:
232 return &elf_howto_table[(int) R_390_PC16];
233 case BFD_RELOC_390_PC12DBL:
234 return &elf_howto_table[(int) R_390_PC12DBL];
235 case BFD_RELOC_390_PLT12DBL:
236 return &elf_howto_table[(int) R_390_PLT12DBL];
237 case BFD_RELOC_390_PC16DBL:
238 return &elf_howto_table[(int) R_390_PC16DBL];
239 case BFD_RELOC_390_PLT16DBL:
240 return &elf_howto_table[(int) R_390_PLT16DBL];
241 case BFD_RELOC_390_PC24DBL:
242 return &elf_howto_table[(int) R_390_PC24DBL];
243 case BFD_RELOC_390_PLT24DBL:
244 return &elf_howto_table[(int) R_390_PLT24DBL];
245 case BFD_RELOC_390_PC32DBL:
246 return &elf_howto_table[(int) R_390_PC32DBL];
247 case BFD_RELOC_390_PLT32DBL:
248 return &elf_howto_table[(int) R_390_PLT32DBL];
249 case BFD_RELOC_390_GOTPCDBL:
250 return &elf_howto_table[(int) R_390_GOTPCDBL];
251 case BFD_RELOC_64:
252 return &elf_howto_table[(int) R_390_64];
253 case BFD_RELOC_64_PCREL:
254 return &elf_howto_table[(int) R_390_PC64];
255 case BFD_RELOC_390_GOT64:
256 return &elf_howto_table[(int) R_390_GOT64];
257 case BFD_RELOC_390_PLT64:
258 return &elf_howto_table[(int) R_390_PLT64];
259 case BFD_RELOC_390_GOTENT:
260 return &elf_howto_table[(int) R_390_GOTENT];
261 case BFD_RELOC_16_GOTOFF:
262 return &elf_howto_table[(int) R_390_GOTOFF16];
263 case BFD_RELOC_390_GOTOFF64:
264 return &elf_howto_table[(int) R_390_GOTOFF64];
265 case BFD_RELOC_390_GOTPLT12:
266 return &elf_howto_table[(int) R_390_GOTPLT12];
267 case BFD_RELOC_390_GOTPLT16:
268 return &elf_howto_table[(int) R_390_GOTPLT16];
269 case BFD_RELOC_390_GOTPLT32:
270 return &elf_howto_table[(int) R_390_GOTPLT32];
271 case BFD_RELOC_390_GOTPLT64:
272 return &elf_howto_table[(int) R_390_GOTPLT64];
273 case BFD_RELOC_390_GOTPLTENT:
274 return &elf_howto_table[(int) R_390_GOTPLTENT];
275 case BFD_RELOC_390_PLTOFF16:
276 return &elf_howto_table[(int) R_390_PLTOFF16];
277 case BFD_RELOC_390_PLTOFF32:
278 return &elf_howto_table[(int) R_390_PLTOFF32];
279 case BFD_RELOC_390_PLTOFF64:
280 return &elf_howto_table[(int) R_390_PLTOFF64];
281 case BFD_RELOC_390_TLS_LOAD:
282 return &elf_howto_table[(int) R_390_TLS_LOAD];
283 case BFD_RELOC_390_TLS_GDCALL:
284 return &elf_howto_table[(int) R_390_TLS_GDCALL];
285 case BFD_RELOC_390_TLS_LDCALL:
286 return &elf_howto_table[(int) R_390_TLS_LDCALL];
287 case BFD_RELOC_390_TLS_GD64:
288 return &elf_howto_table[(int) R_390_TLS_GD64];
289 case BFD_RELOC_390_TLS_GOTIE12:
290 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
291 case BFD_RELOC_390_TLS_GOTIE64:
292 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
293 case BFD_RELOC_390_TLS_LDM64:
294 return &elf_howto_table[(int) R_390_TLS_LDM64];
295 case BFD_RELOC_390_TLS_IE64:
296 return &elf_howto_table[(int) R_390_TLS_IE64];
297 case BFD_RELOC_390_TLS_IEENT:
298 return &elf_howto_table[(int) R_390_TLS_IEENT];
299 case BFD_RELOC_390_TLS_LE64:
300 return &elf_howto_table[(int) R_390_TLS_LE64];
301 case BFD_RELOC_390_TLS_LDO64:
302 return &elf_howto_table[(int) R_390_TLS_LDO64];
303 case BFD_RELOC_390_TLS_DTPMOD:
304 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
305 case BFD_RELOC_390_TLS_DTPOFF:
306 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
307 case BFD_RELOC_390_TLS_TPOFF:
308 return &elf_howto_table[(int) R_390_TLS_TPOFF];
309 case BFD_RELOC_390_20:
310 return &elf_howto_table[(int) R_390_20];
311 case BFD_RELOC_390_GOT20:
312 return &elf_howto_table[(int) R_390_GOT20];
313 case BFD_RELOC_390_GOTPLT20:
314 return &elf_howto_table[(int) R_390_GOTPLT20];
315 case BFD_RELOC_390_TLS_GOTIE20:
316 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
317 case BFD_RELOC_390_IRELATIVE:
318 return &elf_howto_table[(int) R_390_IRELATIVE];
319 case BFD_RELOC_VTABLE_INHERIT:
320 return &elf64_s390_vtinherit_howto;
321 case BFD_RELOC_VTABLE_ENTRY:
322 return &elf64_s390_vtentry_howto;
323 default:
324 break;
325 }
326
327 /* xgettext:c-format */
328 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd, (int) code);
329 bfd_set_error (bfd_error_bad_value);
330 return NULL;
331 }
332
333 static reloc_howto_type *
elf_s390_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)334 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
335 const char *r_name)
336 {
337 unsigned int i;
338
339 for (i = 0;
340 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
341 i++)
342 if (elf_howto_table[i].name != NULL
343 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
344 return &elf_howto_table[i];
345
346 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
347 return &elf64_s390_vtinherit_howto;
348 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
349 return &elf64_s390_vtentry_howto;
350
351 return NULL;
352 }
353
354 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
355 and elf64-s390.c has its own copy. */
356
357 static bool
elf_s390_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)358 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
359 arelent *cache_ptr,
360 Elf_Internal_Rela *dst)
361 {
362 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
363
364 switch (r_type)
365 {
366 case R_390_GNU_VTINHERIT:
367 cache_ptr->howto = &elf64_s390_vtinherit_howto;
368 break;
369
370 case R_390_GNU_VTENTRY:
371 cache_ptr->howto = &elf64_s390_vtentry_howto;
372 break;
373
374 default:
375 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
376 {
377 /* xgettext:c-format */
378 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
379 abfd, r_type);
380 bfd_set_error (bfd_error_bad_value);
381 return false;
382 }
383 cache_ptr->howto = &elf_howto_table[r_type];
384 }
385 return true;
386 }
387
388 /* A relocation function which doesn't do anything. */
389 static bfd_reloc_status_type
s390_tls_reloc(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry,asymbol * symbol ATTRIBUTE_UNUSED,void * data ATTRIBUTE_UNUSED,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)390 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
391 arelent *reloc_entry,
392 asymbol *symbol ATTRIBUTE_UNUSED,
393 void * data ATTRIBUTE_UNUSED,
394 asection *input_section,
395 bfd *output_bfd,
396 char **error_message ATTRIBUTE_UNUSED)
397 {
398 if (output_bfd)
399 reloc_entry->address += input_section->output_offset;
400 return bfd_reloc_ok;
401 }
402
403 /* Handle the large displacement relocs. */
404 static bfd_reloc_status_type
s390_elf_ldisp_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message ATTRIBUTE_UNUSED)405 s390_elf_ldisp_reloc (bfd *abfd,
406 arelent *reloc_entry,
407 asymbol *symbol,
408 void * data,
409 asection *input_section,
410 bfd *output_bfd,
411 char **error_message ATTRIBUTE_UNUSED)
412 {
413 reloc_howto_type *howto = reloc_entry->howto;
414 bfd_vma relocation;
415 bfd_vma insn;
416
417 if (output_bfd != (bfd *) NULL
418 && (symbol->flags & BSF_SECTION_SYM) == 0
419 && (! howto->partial_inplace
420 || reloc_entry->addend == 0))
421 {
422 reloc_entry->address += input_section->output_offset;
423 return bfd_reloc_ok;
424 }
425 if (output_bfd != NULL)
426 return bfd_reloc_continue;
427
428 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
429 return bfd_reloc_outofrange;
430
431 relocation = (symbol->value
432 + symbol->section->output_section->vma
433 + symbol->section->output_offset);
434 relocation += reloc_entry->addend;
435 if (howto->pc_relative)
436 {
437 relocation -= (input_section->output_section->vma
438 + input_section->output_offset);
439 relocation -= reloc_entry->address;
440 }
441
442 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
443 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
444 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
445
446 if ((bfd_signed_vma) relocation < - 0x80000
447 || (bfd_signed_vma) relocation > 0x7ffff)
448 return bfd_reloc_overflow;
449 else
450 return bfd_reloc_ok;
451 }
452
453 static bool
elf_s390_is_local_label_name(bfd * abfd,const char * name)454 elf_s390_is_local_label_name (bfd *abfd, const char *name)
455 {
456 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
457 return true;
458
459 return _bfd_elf_is_local_label_name (abfd, name);
460 }
461
462 /* Functions for the 390 ELF linker. */
463
464 /* The name of the dynamic interpreter. This is put in the .interp
465 section. */
466
467 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
468
469 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
470 copying dynamic variables from a shared lib into an app's dynbss
471 section, and instead use a dynamic relocation to point into the
472 shared lib. */
473 #define ELIMINATE_COPY_RELOCS 1
474
475 /* The size in bytes of the first entry in the procedure linkage table. */
476 #define PLT_FIRST_ENTRY_SIZE 32
477 /* The size in bytes of an entry in the procedure linkage table. */
478 #define PLT_ENTRY_SIZE 32
479
480 #define GOT_ENTRY_SIZE 8
481
482 #define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela)
483
484 /* The first three entries in a global offset table are reserved,
485 and the initial contents are unimportant (we zero them out).
486 Subsequent entries look like this. See the SVR4 ABI 386
487 supplement to see how this works. */
488
489 /* For the s390, simple addr offset can only be 0 - 4096.
490 To use the full 16777216 TB address space, several instructions
491 are needed to load an address in a register and execute
492 a branch( or just saving the address)
493
494 Furthermore, only r 0 and 1 are free to use!!! */
495
496 /* The first 3 words in the GOT are then reserved.
497 Word 0 is the address of the dynamic table.
498 Word 1 is a pointer to a structure describing the object
499 Word 2 is used to point to the loader entry address.
500
501 The code for PLT entries looks like this:
502
503 The GOT holds the address in the PLT to be executed.
504 The loader then gets:
505 48(15) = Pointer to the structure describing the object.
506 56(15) = Offset in symbol table
507 The loader must then find the module where the function is
508 and insert the address in the GOT.
509
510 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
511 LG 1,0(1) # 6 bytes Load address from GOT in r1
512 BCR 15,1 # 2 bytes Jump to address
513 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
514 LGF 1,12(1) # 6 bytes Load rela.plt offset into r1
515 BRCL 15,-x # 6 bytes Jump to first PLT entry
516 .long ? # 4 bytes offset into .rela.plt
517
518 Total = 32 bytes per PLT entry
519 Fixup at offset 2: relative address to GOT entry
520 Fixup at offset 22: relative branch to PLT0
521 Fixup at offset 28: 32 bit offset into .rela.plt
522
523 A 32 bit offset into the symbol table is enough. It allows for
524 .rela.plt sections up to a size of 2 gigabyte. A single dynamic
525 object (the main program, any shared library) is limited to 4GB in
526 size. Having a .rela.plt of 2GB would already make the .plt
527 section bigger than 8GB. */
528
529 static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] =
530 {
531 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
532 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, /* lg %r1,0(%r1) */
533 0x07, 0xf1, /* br %r1 */
534 0x0d, 0x10, /* basr %r1,%r0 */
535 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, /* lgf %r1,12(%r1) */
536 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, /* jg first plt */
537 0x00, 0x00, 0x00, 0x00 /* .long 0x00000000 */
538 };
539
540 /* The first PLT entry pushes the offset into the symbol table
541 from R1 onto the stack at 56(15) and the loader object info
542 at 48(15), loads the loader address in R1 and jumps to it. */
543
544 /* The first entry in the PLT:
545
546 PLT0:
547 STG 1,56(15) # r1 contains the offset into the symbol table
548 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
549 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
550 LG 1,16(1) # get entry address of loader
551 BCR 15,1 # jump to loader
552
553 Fixup at offset 8: relative address to start of GOT. */
554
555 static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] =
556 {
557 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, /* stg %r1,56(%r15) */
558 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
559 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, /* mvc 48(8,%r15),8(%r1) */
560 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, /* lg %r1,16(%r1) */
561 0x07, 0xf1, /* br %r1 */
562 0x07, 0x00, /* nopr %r0 */
563 0x07, 0x00, /* nopr %r0 */
564 0x07, 0x00 /* nopr %r0 */
565 };
566
567
568 /* s390 ELF linker hash entry. */
569
570 struct elf_s390_link_hash_entry
571 {
572 struct elf_link_hash_entry elf;
573
574 /* Number of GOTPLT references for a function. */
575 bfd_signed_vma gotplt_refcount;
576
577 #define GOT_UNKNOWN 0
578 #define GOT_NORMAL 1
579 #define GOT_TLS_GD 2
580 #define GOT_TLS_IE 3
581 #define GOT_TLS_IE_NLT 3
582 unsigned char tls_type;
583
584 /* For pointer equality reasons we might need to change the symbol
585 type from STT_GNU_IFUNC to STT_FUNC together with its value and
586 section entry. So after alloc_dynrelocs only these values should
587 be used. In order to check whether a symbol is IFUNC use
588 s390_is_ifunc_symbol_p. */
589 bfd_vma ifunc_resolver_address;
590 asection *ifunc_resolver_section;
591 };
592
593 #define elf_s390_hash_entry(ent) \
594 ((struct elf_s390_link_hash_entry *)(ent))
595
596 /* This structure represents an entry in the local PLT list needed for
597 local IFUNC symbols. */
598 struct plt_entry
599 {
600 /* The section of the local symbol.
601 Set in relocate_section and used in finish_dynamic_sections. */
602 asection *sec;
603
604 union
605 {
606 bfd_signed_vma refcount;
607 bfd_vma offset;
608 } plt;
609 };
610
611 /* NOTE: Keep this structure in sync with
612 the one declared in elf32-s390.c. */
613 struct elf_s390_obj_tdata
614 {
615 struct elf_obj_tdata root;
616
617 /* A local PLT is needed for ifunc symbols. */
618 struct plt_entry *local_plt;
619
620 /* TLS type for each local got entry. */
621 char *local_got_tls_type;
622 };
623
624 #define elf_s390_tdata(abfd) \
625 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
626
627 #define elf_s390_local_plt(abfd) \
628 (elf_s390_tdata (abfd)->local_plt)
629
630 #define elf_s390_local_got_tls_type(abfd) \
631 (elf_s390_tdata (abfd)->local_got_tls_type)
632
633 #define is_s390_elf(bfd) \
634 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
635 && elf_tdata (bfd) != NULL \
636 && elf_object_id (bfd) == S390_ELF_DATA)
637
638 static bool
elf_s390_mkobject(bfd * abfd)639 elf_s390_mkobject (bfd *abfd)
640 {
641 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
642 S390_ELF_DATA);
643 }
644
645 static bool
elf_s390_object_p(bfd * abfd)646 elf_s390_object_p (bfd *abfd)
647 {
648 /* Set the right machine number for an s390 elf32 file. */
649 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
650 }
651
652 /* s390 ELF linker hash table. */
653
654 struct elf_s390_link_hash_table
655 {
656 struct elf_link_hash_table elf;
657
658 /* Short-cuts to get to dynamic linker sections. */
659 asection *irelifunc;
660
661 union {
662 bfd_signed_vma refcount;
663 bfd_vma offset;
664 } tls_ldm_got;
665
666 /* Options passed from the linker. */
667 struct s390_elf_params *params;
668 };
669
670 /* Get the s390 ELF linker hash table from a link_info structure. */
671
672 #define elf_s390_hash_table(p) \
673 ((is_elf_hash_table ((p)->hash) \
674 && elf_hash_table_id (elf_hash_table (p)) == S390_ELF_DATA) \
675 ? (struct elf_s390_link_hash_table *) (p)->hash : NULL)
676
677 #define ELF64 1
678 #include "elf-s390-common.c"
679
680 /* Create an entry in an s390 ELF linker hash table. */
681
682 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)683 link_hash_newfunc (struct bfd_hash_entry *entry,
684 struct bfd_hash_table *table,
685 const char *string)
686 {
687 /* Allocate the structure if it has not already been allocated by a
688 subclass. */
689 if (entry == NULL)
690 {
691 entry = bfd_hash_allocate (table,
692 sizeof (struct elf_s390_link_hash_entry));
693 if (entry == NULL)
694 return entry;
695 }
696
697 /* Call the allocation method of the superclass. */
698 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
699 if (entry != NULL)
700 {
701 struct elf_s390_link_hash_entry *eh;
702
703 eh = (struct elf_s390_link_hash_entry *) entry;
704 eh->gotplt_refcount = 0;
705 eh->tls_type = GOT_UNKNOWN;
706 eh->ifunc_resolver_address = 0;
707 eh->ifunc_resolver_section = NULL;
708 }
709
710 return entry;
711 }
712
713 /* Create an s390 ELF linker hash table. */
714
715 static struct bfd_link_hash_table *
elf_s390_link_hash_table_create(bfd * abfd)716 elf_s390_link_hash_table_create (bfd *abfd)
717 {
718 struct elf_s390_link_hash_table *ret;
719 size_t amt = sizeof (struct elf_s390_link_hash_table);
720
721 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
722 if (ret == NULL)
723 return NULL;
724
725 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
726 sizeof (struct elf_s390_link_hash_entry),
727 S390_ELF_DATA))
728 {
729 free (ret);
730 return NULL;
731 }
732
733 return &ret->elf.root;
734 }
735
736 /* Copy the extra info we tack onto an elf_link_hash_entry. */
737
738 static void
elf_s390_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)739 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
740 struct elf_link_hash_entry *dir,
741 struct elf_link_hash_entry *ind)
742 {
743 struct elf_s390_link_hash_entry *edir, *eind;
744
745 edir = (struct elf_s390_link_hash_entry *) dir;
746 eind = (struct elf_s390_link_hash_entry *) ind;
747
748 if (ind->root.type == bfd_link_hash_indirect
749 && dir->got.refcount <= 0)
750 {
751 edir->tls_type = eind->tls_type;
752 eind->tls_type = GOT_UNKNOWN;
753 }
754
755 if (ELIMINATE_COPY_RELOCS
756 && ind->root.type != bfd_link_hash_indirect
757 && dir->dynamic_adjusted)
758 {
759 /* If called to transfer flags for a weakdef during processing
760 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
761 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
762 if (dir->versioned != versioned_hidden)
763 dir->ref_dynamic |= ind->ref_dynamic;
764 dir->ref_regular |= ind->ref_regular;
765 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
766 dir->needs_plt |= ind->needs_plt;
767 }
768 else
769 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
770 }
771
772 static int
elf_s390_tls_transition(struct bfd_link_info * info,int r_type,int is_local)773 elf_s390_tls_transition (struct bfd_link_info *info,
774 int r_type,
775 int is_local)
776 {
777 if (bfd_link_dll (info))
778 return r_type;
779
780 switch (r_type)
781 {
782 case R_390_TLS_GD64:
783 case R_390_TLS_IE64:
784 if (is_local)
785 return R_390_TLS_LE64;
786 return R_390_TLS_IE64;
787 case R_390_TLS_GOTIE64:
788 if (is_local)
789 return R_390_TLS_LE64;
790 return R_390_TLS_GOTIE64;
791 case R_390_TLS_LDM64:
792 return R_390_TLS_LE64;
793 }
794
795 return r_type;
796 }
797
798 /* Look through the relocs for a section during the first phase, and
799 allocate space in the global offset table or procedure linkage
800 table. */
801
802 static bool
elf_s390_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)803 elf_s390_check_relocs (bfd *abfd,
804 struct bfd_link_info *info,
805 asection *sec,
806 const Elf_Internal_Rela *relocs)
807 {
808 struct elf_s390_link_hash_table *htab;
809 Elf_Internal_Shdr *symtab_hdr;
810 struct elf_link_hash_entry **sym_hashes;
811 const Elf_Internal_Rela *rel;
812 const Elf_Internal_Rela *rel_end;
813 asection *sreloc;
814 bfd_signed_vma *local_got_refcounts;
815 int tls_type, old_tls_type;
816
817 if (bfd_link_relocatable (info))
818 return true;
819
820 BFD_ASSERT (is_s390_elf (abfd));
821
822 htab = elf_s390_hash_table (info);
823 if (htab == NULL)
824 return false;
825
826 symtab_hdr = &elf_symtab_hdr (abfd);
827 sym_hashes = elf_sym_hashes (abfd);
828 local_got_refcounts = elf_local_got_refcounts (abfd);
829
830 sreloc = NULL;
831
832 rel_end = relocs + sec->reloc_count;
833 for (rel = relocs; rel < rel_end; rel++)
834 {
835 unsigned int r_type;
836 unsigned int r_symndx;
837 struct elf_link_hash_entry *h;
838 Elf_Internal_Sym *isym;
839
840 r_symndx = ELF64_R_SYM (rel->r_info);
841
842 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
843 {
844 /* xgettext:c-format */
845 _bfd_error_handler (_("%pB: bad symbol index: %d"),
846 abfd, r_symndx);
847 return false;
848 }
849
850 if (r_symndx < symtab_hdr->sh_info)
851 {
852 /* A local symbol. */
853 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
854 abfd, r_symndx);
855 if (isym == NULL)
856 return false;
857
858 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
859 {
860 struct plt_entry *plt;
861
862 if (htab->elf.dynobj == NULL)
863 htab->elf.dynobj = abfd;
864
865 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
866 return false;
867
868 if (local_got_refcounts == NULL)
869 {
870 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
871 return false;
872 local_got_refcounts = elf_local_got_refcounts (abfd);
873 }
874 plt = elf_s390_local_plt (abfd);
875 plt[r_symndx].plt.refcount++;
876 }
877 h = NULL;
878 }
879 else
880 {
881 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
882 while (h->root.type == bfd_link_hash_indirect
883 || h->root.type == bfd_link_hash_warning)
884 h = (struct elf_link_hash_entry *) h->root.u.i.link;
885 }
886
887 /* Create got section and local_got_refcounts array if they
888 are needed. */
889 r_type = elf_s390_tls_transition (info,
890 ELF64_R_TYPE (rel->r_info),
891 h == NULL);
892 switch (r_type)
893 {
894 case R_390_GOT12:
895 case R_390_GOT16:
896 case R_390_GOT20:
897 case R_390_GOT32:
898 case R_390_GOT64:
899 case R_390_GOTENT:
900 case R_390_GOTPLT12:
901 case R_390_GOTPLT16:
902 case R_390_GOTPLT20:
903 case R_390_GOTPLT32:
904 case R_390_GOTPLT64:
905 case R_390_GOTPLTENT:
906 case R_390_TLS_GD64:
907 case R_390_TLS_GOTIE12:
908 case R_390_TLS_GOTIE20:
909 case R_390_TLS_GOTIE64:
910 case R_390_TLS_IEENT:
911 case R_390_TLS_IE64:
912 case R_390_TLS_LDM64:
913 if (h == NULL
914 && local_got_refcounts == NULL)
915 {
916 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
917 return false;
918 local_got_refcounts = elf_local_got_refcounts (abfd);
919 }
920
921 /* Fall through. */
922 case R_390_GOTOFF16:
923 case R_390_GOTOFF32:
924 case R_390_GOTOFF64:
925 case R_390_GOTPC:
926 case R_390_GOTPCDBL:
927 if (htab->elf.sgot == NULL)
928 {
929 if (htab->elf.dynobj == NULL)
930 htab->elf.dynobj = abfd;
931 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
932 return false;
933 }
934 }
935
936 if (h != NULL)
937 {
938 if (htab->elf.dynobj == NULL)
939 htab->elf.dynobj = abfd;
940 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
941 return false;
942
943 /* Make sure an IFUNC symbol defined in a non-shared object
944 always gets a PLT slot. */
945 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
946 {
947 /* The symbol is called by the dynamic loader in order
948 to resolve the relocation. So it is in fact also
949 referenced. */
950 h->ref_regular = 1;
951 h->needs_plt = 1;
952 }
953 }
954
955 switch (r_type)
956 {
957 case R_390_GOTPC:
958 case R_390_GOTPCDBL:
959 /* These relocs do not need a GOT slot. They just load the
960 GOT pointer itself or address something else relative to
961 the GOT. Since the GOT pointer has been set up above we
962 are done. */
963 break;
964 case R_390_GOTOFF16:
965 case R_390_GOTOFF32:
966 case R_390_GOTOFF64:
967 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
968 break;
969 /* Fall through. */
970
971 case R_390_PLT12DBL:
972 case R_390_PLT16DBL:
973 case R_390_PLT24DBL:
974 case R_390_PLT32:
975 case R_390_PLT32DBL:
976 case R_390_PLT64:
977 case R_390_PLTOFF16:
978 case R_390_PLTOFF32:
979 case R_390_PLTOFF64:
980 /* This symbol requires a procedure linkage table entry. We
981 actually build the entry in adjust_dynamic_symbol,
982 because this might be a case of linking PIC code which is
983 never referenced by a dynamic object, in which case we
984 don't need to generate a procedure linkage table entry
985 after all. */
986
987 /* If this is a local symbol, we resolve it directly without
988 creating a procedure linkage table entry. */
989 if (h != NULL)
990 {
991 h->needs_plt = 1;
992 h->plt.refcount += 1;
993 }
994 break;
995
996 case R_390_GOTPLT12:
997 case R_390_GOTPLT16:
998 case R_390_GOTPLT20:
999 case R_390_GOTPLT32:
1000 case R_390_GOTPLT64:
1001 case R_390_GOTPLTENT:
1002 /* This symbol requires either a procedure linkage table entry
1003 or an entry in the local got. We actually build the entry
1004 in adjust_dynamic_symbol because whether this is really a
1005 global reference can change and with it the fact if we have
1006 to create a plt entry or a local got entry. To be able to
1007 make a once global symbol a local one we have to keep track
1008 of the number of gotplt references that exist for this
1009 symbol. */
1010 if (h != NULL)
1011 {
1012 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1013 h->needs_plt = 1;
1014 h->plt.refcount += 1;
1015 }
1016 else
1017 local_got_refcounts[r_symndx] += 1;
1018 break;
1019
1020 case R_390_TLS_LDM64:
1021 htab->tls_ldm_got.refcount += 1;
1022 break;
1023
1024 case R_390_TLS_IE64:
1025 case R_390_TLS_GOTIE12:
1026 case R_390_TLS_GOTIE20:
1027 case R_390_TLS_GOTIE64:
1028 case R_390_TLS_IEENT:
1029 if (bfd_link_dll (info))
1030 info->flags |= DF_STATIC_TLS;
1031 /* Fall through */
1032
1033 case R_390_GOT12:
1034 case R_390_GOT16:
1035 case R_390_GOT20:
1036 case R_390_GOT32:
1037 case R_390_GOT64:
1038 case R_390_GOTENT:
1039 case R_390_TLS_GD64:
1040 /* This symbol requires a global offset table entry. */
1041 switch (r_type)
1042 {
1043 default:
1044 case R_390_GOT12:
1045 case R_390_GOT16:
1046 case R_390_GOT20:
1047 case R_390_GOT32:
1048 case R_390_GOTENT:
1049 tls_type = GOT_NORMAL;
1050 break;
1051 case R_390_TLS_GD64:
1052 tls_type = GOT_TLS_GD;
1053 break;
1054 case R_390_TLS_IE64:
1055 case R_390_TLS_GOTIE64:
1056 tls_type = GOT_TLS_IE;
1057 break;
1058 case R_390_TLS_GOTIE12:
1059 case R_390_TLS_GOTIE20:
1060 case R_390_TLS_IEENT:
1061 tls_type = GOT_TLS_IE_NLT;
1062 break;
1063 }
1064
1065 if (h != NULL)
1066 {
1067 h->got.refcount += 1;
1068 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1069 }
1070 else
1071 {
1072 local_got_refcounts[r_symndx] += 1;
1073 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1074 }
1075 /* If a TLS symbol is accessed using IE at least once,
1076 there is no point to use dynamic model for it. */
1077 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1078 {
1079 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1080 {
1081 _bfd_error_handler
1082 /* xgettext:c-format */
1083 (_("%pB: `%s' accessed both as normal and thread local symbol"),
1084 abfd, h->root.root.string);
1085 return false;
1086 }
1087 if (old_tls_type > tls_type)
1088 tls_type = old_tls_type;
1089 }
1090
1091 if (old_tls_type != tls_type)
1092 {
1093 if (h != NULL)
1094 elf_s390_hash_entry (h)->tls_type = tls_type;
1095 else
1096 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1097 }
1098
1099 if (r_type != R_390_TLS_IE64)
1100 break;
1101 /* Fall through */
1102
1103 case R_390_TLS_LE64:
1104 /* For static linking and executables this reloc will be
1105 calculated at linktime otherwise a TLS_TPOFF runtime
1106 reloc will be generated. */
1107 if (r_type == R_390_TLS_LE64 && bfd_link_pie (info))
1108 break;
1109
1110 if (!bfd_link_dll (info))
1111 break;
1112 info->flags |= DF_STATIC_TLS;
1113 /* Fall through */
1114
1115 case R_390_8:
1116 case R_390_16:
1117 case R_390_32:
1118 case R_390_64:
1119 case R_390_PC12DBL:
1120 case R_390_PC16:
1121 case R_390_PC16DBL:
1122 case R_390_PC24DBL:
1123 case R_390_PC32:
1124 case R_390_PC32DBL:
1125 case R_390_PC64:
1126 if (h != NULL && bfd_link_executable (info))
1127 {
1128 /* If this reloc is in a read-only section, we might
1129 need a copy reloc. We can't check reliably at this
1130 stage whether the section is read-only, as input
1131 sections have not yet been mapped to output sections.
1132 Tentatively set the flag for now, and correct in
1133 adjust_dynamic_symbol. */
1134 h->non_got_ref = 1;
1135
1136 if (!bfd_link_pic (info))
1137 {
1138 /* We may need a .plt entry if the function this reloc
1139 refers to is in a shared lib. */
1140 h->plt.refcount += 1;
1141 }
1142 }
1143
1144 /* If we are creating a shared library, and this is a reloc
1145 against a global symbol, or a non PC relative reloc
1146 against a local symbol, then we need to copy the reloc
1147 into the shared library. However, if we are linking with
1148 -Bsymbolic, we do not need to copy a reloc against a
1149 global symbol which is defined in an object we are
1150 including in the link (i.e., DEF_REGULAR is set). At
1151 this point we have not seen all the input files, so it is
1152 possible that DEF_REGULAR is not set now but will be set
1153 later (it is never cleared). In case of a weak definition,
1154 DEF_REGULAR may be cleared later by a strong definition in
1155 a shared library. We account for that possibility below by
1156 storing information in the relocs_copied field of the hash
1157 table entry. A similar situation occurs when creating
1158 shared libraries and symbol visibility changes render the
1159 symbol local.
1160
1161 If on the other hand, we are creating an executable, we
1162 may need to keep relocations for symbols satisfied by a
1163 dynamic library if we manage to avoid copy relocs for the
1164 symbol. */
1165 if ((bfd_link_pic (info)
1166 && (sec->flags & SEC_ALLOC) != 0
1167 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1168 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL
1169 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1170 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL
1171 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1172 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1173 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1174 || (h != NULL
1175 && (! SYMBOLIC_BIND (info, h)
1176 || h->root.type == bfd_link_hash_defweak
1177 || !h->def_regular))))
1178 || (ELIMINATE_COPY_RELOCS
1179 && !bfd_link_pic (info)
1180 && (sec->flags & SEC_ALLOC) != 0
1181 && h != NULL
1182 && (h->root.type == bfd_link_hash_defweak
1183 || !h->def_regular)))
1184 {
1185 struct elf_dyn_relocs *p;
1186 struct elf_dyn_relocs **head;
1187
1188 /* We must copy these reloc types into the output file.
1189 Create a reloc section in dynobj and make room for
1190 this reloc. */
1191 if (sreloc == NULL)
1192 {
1193 if (htab->elf.dynobj == NULL)
1194 htab->elf.dynobj = abfd;
1195
1196 sreloc = _bfd_elf_make_dynamic_reloc_section
1197 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ true);
1198
1199 if (sreloc == NULL)
1200 return false;
1201 }
1202
1203 /* If this is a global symbol, we count the number of
1204 relocations we need for this symbol. */
1205 if (h != NULL)
1206 {
1207 head = &h->dyn_relocs;
1208 }
1209 else
1210 {
1211 /* Track dynamic relocs needed for local syms too.
1212 We really need local syms available to do this
1213 easily. Oh well. */
1214 asection *s;
1215 void *vpp;
1216
1217 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1218 abfd, r_symndx);
1219 if (isym == NULL)
1220 return false;
1221
1222 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1223 if (s == NULL)
1224 s = sec;
1225
1226 vpp = &elf_section_data (s)->local_dynrel;
1227 head = (struct elf_dyn_relocs **) vpp;
1228 }
1229
1230 p = *head;
1231 if (p == NULL || p->sec != sec)
1232 {
1233 size_t amt = sizeof *p;
1234 p = ((struct elf_dyn_relocs *)
1235 bfd_alloc (htab->elf.dynobj, amt));
1236 if (p == NULL)
1237 return false;
1238 p->next = *head;
1239 *head = p;
1240 p->sec = sec;
1241 p->count = 0;
1242 p->pc_count = 0;
1243 }
1244
1245 p->count += 1;
1246 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1247 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL
1248 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1249 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1250 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1251 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1252 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1253 p->pc_count += 1;
1254 }
1255 break;
1256
1257 /* This relocation describes the C++ object vtable hierarchy.
1258 Reconstruct it for later use during GC. */
1259 case R_390_GNU_VTINHERIT:
1260 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1261 return false;
1262 break;
1263
1264 /* This relocation describes which C++ vtable entries are actually
1265 used. Record for later use during GC. */
1266 case R_390_GNU_VTENTRY:
1267 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1268 return false;
1269 break;
1270
1271 default:
1272 break;
1273 }
1274 }
1275
1276 return true;
1277 }
1278
1279 /* Return the section that should be marked against GC for a given
1280 relocation. */
1281
1282 static asection *
elf_s390_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1283 elf_s390_gc_mark_hook (asection *sec,
1284 struct bfd_link_info *info,
1285 Elf_Internal_Rela *rel,
1286 struct elf_link_hash_entry *h,
1287 Elf_Internal_Sym *sym)
1288 {
1289 if (h != NULL)
1290 switch (ELF64_R_TYPE (rel->r_info))
1291 {
1292 case R_390_GNU_VTINHERIT:
1293 case R_390_GNU_VTENTRY:
1294 return NULL;
1295 }
1296
1297 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1298 }
1299
1300 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1301 entry but we found we will not create any. Called when we find we will
1302 not have any PLT for this symbol, by for example
1303 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1304 or elf_s390_late_size_sections if no dynamic sections will be
1305 created (we're only linking static objects). */
1306
1307 static void
elf_s390_adjust_gotplt(struct elf_s390_link_hash_entry * h)1308 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1309 {
1310 if (h->elf.root.type == bfd_link_hash_warning)
1311 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1312
1313 if (h->gotplt_refcount <= 0)
1314 return;
1315
1316 /* We simply add the number of gotplt references to the number
1317 * of got references for this symbol. */
1318 h->elf.got.refcount += h->gotplt_refcount;
1319 h->gotplt_refcount = -1;
1320 }
1321
1322 /* Adjust a symbol defined by a dynamic object and referenced by a
1323 regular object. The current definition is in some section of the
1324 dynamic object, but we're not including those sections. We have to
1325 change the definition to something the rest of the link can
1326 understand. */
1327
1328 static bool
elf_s390_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1329 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1330 struct elf_link_hash_entry *h)
1331 {
1332 struct elf_s390_link_hash_table *htab;
1333 asection *s, *srel;
1334
1335 /* STT_GNU_IFUNC symbol must go through PLT. */
1336 if (s390_is_ifunc_symbol_p (h))
1337 {
1338 /* All local STT_GNU_IFUNC references must be treated as local
1339 calls via local PLT. */
1340 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1341 {
1342 bfd_size_type pc_count = 0, count = 0;
1343 struct elf_dyn_relocs **pp;
1344 struct elf_dyn_relocs *p;
1345
1346 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1347 {
1348 pc_count += p->pc_count;
1349 p->count -= p->pc_count;
1350 p->pc_count = 0;
1351 count += p->count;
1352 if (p->count == 0)
1353 *pp = p->next;
1354 else
1355 pp = &p->next;
1356 }
1357
1358 if (pc_count || count)
1359 {
1360 h->needs_plt = 1;
1361 h->non_got_ref = 1;
1362 if (h->plt.refcount <= 0)
1363 h->plt.refcount = 1;
1364 else
1365 h->plt.refcount += 1;
1366 }
1367 }
1368
1369 if (h->plt.refcount <= 0)
1370 {
1371 h->plt.offset = (bfd_vma) -1;
1372 h->needs_plt = 0;
1373 }
1374 return true;
1375 }
1376
1377 /* If this is a function, put it in the procedure linkage table. We
1378 will fill in the contents of the procedure linkage table later
1379 (although we could actually do it here). */
1380 if (h->type == STT_FUNC
1381 || h->needs_plt)
1382 {
1383 if (h->plt.refcount <= 0
1384 || SYMBOL_CALLS_LOCAL (info, h)
1385 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1386 {
1387 /* This case can occur if we saw a PLT32 reloc in an input
1388 file, but the symbol was never referred to by a dynamic
1389 object, or if all references were garbage collected. In
1390 such a case, we don't actually need to build a procedure
1391 linkage table, and we can just do a PC32 reloc instead. */
1392 h->plt.offset = (bfd_vma) -1;
1393 h->needs_plt = 0;
1394 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1395 }
1396
1397 return true;
1398 }
1399 else
1400 /* It's possible that we incorrectly decided a .plt reloc was
1401 needed for an R_390_PC32 reloc to a non-function sym in
1402 check_relocs. We can't decide accurately between function and
1403 non-function syms in check-relocs; Objects loaded later in
1404 the link may change h->type. So fix it now. */
1405 h->plt.offset = (bfd_vma) -1;
1406
1407 /* If this is a weak symbol, and there is a real definition, the
1408 processor independent code will have arranged for us to see the
1409 real definition first, and we can just use the same value. */
1410 if (h->is_weakalias)
1411 {
1412 struct elf_link_hash_entry *def = weakdef (h);
1413 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1414 h->root.u.def.section = def->root.u.def.section;
1415 h->root.u.def.value = def->root.u.def.value;
1416 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1417 h->non_got_ref = def->non_got_ref;
1418 return true;
1419 }
1420
1421 /* This is a reference to a symbol defined by a dynamic object which
1422 is not a function. */
1423
1424 /* If we are creating a shared library, we must presume that the
1425 only references to the symbol are via the global offset table.
1426 For such cases we need not do anything here; the relocations will
1427 be handled correctly by relocate_section. */
1428 if (bfd_link_pic (info))
1429 return true;
1430
1431 /* If there are no references to this symbol that do not use the
1432 GOT, we don't need to generate a copy reloc. */
1433 if (!h->non_got_ref)
1434 return true;
1435
1436 /* If -z nocopyreloc was given, we won't generate them either. */
1437 if (info->nocopyreloc)
1438 {
1439 h->non_got_ref = 0;
1440 return true;
1441 }
1442
1443 /* If we don't find any dynamic relocs in read-only sections, then
1444 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1445 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h))
1446 {
1447 h->non_got_ref = 0;
1448 return true;
1449 }
1450
1451 /* We must allocate the symbol in our .dynbss section, which will
1452 become part of the .bss section of the executable. There will be
1453 an entry for this symbol in the .dynsym section. The dynamic
1454 object will contain position independent code, so all references
1455 from the dynamic object to this symbol will go through the global
1456 offset table. The dynamic linker will use the .dynsym entry to
1457 determine the address it must put in the global offset table, so
1458 both the dynamic object and the regular object will refer to the
1459 same memory location for the variable. */
1460
1461 htab = elf_s390_hash_table (info);
1462 if (htab == NULL)
1463 return false;
1464
1465 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1466 copy the initial value out of the dynamic object and into the
1467 runtime process image. */
1468 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1469 {
1470 s = htab->elf.sdynrelro;
1471 srel = htab->elf.sreldynrelro;
1472 }
1473 else
1474 {
1475 s = htab->elf.sdynbss;
1476 srel = htab->elf.srelbss;
1477 }
1478 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1479 {
1480 srel->size += sizeof (Elf64_External_Rela);
1481 h->needs_copy = 1;
1482 }
1483
1484 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1485 }
1486
1487 /* Allocate space in .plt, .got and associated reloc sections for
1488 dynamic relocs. */
1489
1490 static bool
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1491 allocate_dynrelocs (struct elf_link_hash_entry *h,
1492 void * inf)
1493 {
1494 struct bfd_link_info *info;
1495 struct elf_s390_link_hash_table *htab;
1496 struct elf_dyn_relocs *p;
1497
1498 if (h->root.type == bfd_link_hash_indirect)
1499 return true;
1500
1501 info = (struct bfd_link_info *) inf;
1502 htab = elf_s390_hash_table (info);
1503 if (htab == NULL)
1504 return false;
1505
1506 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1507 here if it is defined and referenced in a non-shared object. */
1508 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1509 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1510 else if (htab->elf.dynamic_sections_created
1511 && h->plt.refcount > 0)
1512 {
1513 /* Make sure this symbol is output as a dynamic symbol.
1514 Undefined weak syms won't yet be marked as dynamic. */
1515 if (h->dynindx == -1
1516 && !h->forced_local)
1517 {
1518 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1519 return false;
1520 }
1521
1522 if (bfd_link_pic (info)
1523 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1524 {
1525 asection *s = htab->elf.splt;
1526
1527 /* If this is the first .plt entry, make room for the special
1528 first entry. */
1529 if (s->size == 0)
1530 s->size += PLT_FIRST_ENTRY_SIZE;
1531
1532 h->plt.offset = s->size;
1533
1534 /* If this symbol is not defined in a regular file, and we are
1535 not generating a shared library, then set the symbol to this
1536 location in the .plt. This is required to make function
1537 pointers compare as equal between the normal executable and
1538 the shared library. */
1539 if (! bfd_link_pic (info)
1540 && !h->def_regular)
1541 {
1542 h->root.u.def.section = s;
1543 h->root.u.def.value = h->plt.offset;
1544 }
1545
1546 /* Make room for this entry. */
1547 s->size += PLT_ENTRY_SIZE;
1548
1549 /* We also need to make an entry in the .got.plt section. */
1550 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1551
1552 /* We also need to make an entry in the .rela.plt section. */
1553 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1554 }
1555 else
1556 {
1557 h->plt.offset = (bfd_vma) -1;
1558 h->needs_plt = 0;
1559 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1560 }
1561 }
1562 else
1563 {
1564 h->plt.offset = (bfd_vma) -1;
1565 h->needs_plt = 0;
1566 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1567 }
1568
1569 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1570 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1571 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1572 we can save the dynamic TLS relocation. */
1573 if (h->got.refcount > 0
1574 && !bfd_link_dll (info)
1575 && h->dynindx == -1
1576 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1577 {
1578 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1579 /* For the GOTIE access without a literal pool entry the offset has
1580 to be stored somewhere. The immediate value in the instruction
1581 is not bit enough so the value is stored in the got. */
1582 {
1583 h->got.offset = htab->elf.sgot->size;
1584 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1585 }
1586 else
1587 h->got.offset = (bfd_vma) -1;
1588 }
1589 else if (h->got.refcount > 0)
1590 {
1591 asection *s;
1592 bool dyn;
1593 int tls_type = elf_s390_hash_entry(h)->tls_type;
1594
1595 /* Make sure this symbol is output as a dynamic symbol.
1596 Undefined weak syms won't yet be marked as dynamic. */
1597 if (h->dynindx == -1
1598 && !h->forced_local)
1599 {
1600 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1601 return false;
1602 }
1603
1604 s = htab->elf.sgot;
1605 h->got.offset = s->size;
1606 s->size += GOT_ENTRY_SIZE;
1607 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1608 if (tls_type == GOT_TLS_GD)
1609 s->size += GOT_ENTRY_SIZE;
1610 dyn = htab->elf.dynamic_sections_created;
1611 /* R_390_TLS_IE64 needs one dynamic relocation,
1612 R_390_TLS_GD64 needs one if local symbol and two if global. */
1613 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1614 || tls_type >= GOT_TLS_IE)
1615 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1616 else if (tls_type == GOT_TLS_GD)
1617 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1618 else if (!UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)
1619 && (bfd_link_pic (info)
1620 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1621 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1622 }
1623 else
1624 h->got.offset = (bfd_vma) -1;
1625
1626 if (h->dyn_relocs == NULL)
1627 return true;
1628
1629 /* In the shared -Bsymbolic case, discard space allocated for
1630 dynamic pc-relative relocs against symbols which turn out to be
1631 defined in regular objects. For the normal shared case, discard
1632 space for pc-relative relocs that have become local due to symbol
1633 visibility changes. */
1634
1635 if (bfd_link_pic (info))
1636 {
1637 if (SYMBOL_CALLS_LOCAL (info, h))
1638 {
1639 struct elf_dyn_relocs **pp;
1640
1641 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1642 {
1643 p->count -= p->pc_count;
1644 p->pc_count = 0;
1645 if (p->count == 0)
1646 *pp = p->next;
1647 else
1648 pp = &p->next;
1649 }
1650 }
1651
1652 /* Also discard relocs on undefined weak syms with non-default
1653 visibility. */
1654 if (h->dyn_relocs != NULL
1655 && h->root.type == bfd_link_hash_undefweak)
1656 {
1657 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1658 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1659 h->dyn_relocs = NULL;
1660
1661 /* Make sure undefined weak symbols are output as a dynamic
1662 symbol in PIEs. */
1663 else if (h->dynindx == -1
1664 && !h->forced_local)
1665 {
1666 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1667 return false;
1668 }
1669 }
1670 }
1671 else if (ELIMINATE_COPY_RELOCS)
1672 {
1673 /* For the non-shared case, discard space for relocs against
1674 symbols which turn out to need copy relocs or are not
1675 dynamic. */
1676
1677 if (!h->non_got_ref
1678 && ((h->def_dynamic
1679 && !h->def_regular)
1680 || (htab->elf.dynamic_sections_created
1681 && (h->root.type == bfd_link_hash_undefweak
1682 || h->root.type == bfd_link_hash_undefined))))
1683 {
1684 /* Make sure this symbol is output as a dynamic symbol.
1685 Undefined weak syms won't yet be marked as dynamic. */
1686 if (h->dynindx == -1
1687 && !h->forced_local)
1688 {
1689 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1690 return false;
1691 }
1692
1693 /* If that succeeded, we know we'll be keeping all the
1694 relocs. */
1695 if (h->dynindx != -1)
1696 goto keep;
1697 }
1698
1699 h->dyn_relocs = NULL;
1700
1701 keep: ;
1702 }
1703
1704 /* Finally, allocate space. */
1705 for (p = h->dyn_relocs; p != NULL; p = p->next)
1706 {
1707 asection *sreloc = elf_section_data (p->sec)->sreloc;
1708 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1709 }
1710
1711 return true;
1712 }
1713
1714 /* Set the sizes of the dynamic sections. */
1715
1716 static bool
elf_s390_late_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)1717 elf_s390_late_size_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 return true;
1733
1734 if (htab->elf.dynamic_sections_created)
1735 {
1736 /* Set the contents of the .interp section to the interpreter. */
1737 if (bfd_link_executable (info) && !info->nointerp)
1738 {
1739 s = bfd_get_linker_section (dynobj, ".interp");
1740 if (s == NULL)
1741 abort ();
1742 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1743 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1744 }
1745 }
1746
1747 if (htab->elf.sgot && s390_gotplt_after_got_p (info))
1748 {
1749 /* _bfd_elf_create_got_section adds the got header size always
1750 to .got.plt but we need it in .got if this section comes
1751 first. */
1752 htab->elf.sgot->size += 3 * GOT_ENTRY_SIZE;
1753 htab->elf.sgotplt->size -= 3 * GOT_ENTRY_SIZE;
1754
1755 /* Make the _GLOBAL_OFFSET_TABLE_ symbol point to the .got
1756 instead of .got.plt. */
1757 htab->elf.hgot->root.u.def.section = htab->elf.sgot;
1758 htab->elf.hgot->root.u.def.value = 0;
1759 }
1760
1761 /* Set up .got offsets for local syms, and space for local dynamic
1762 relocs. */
1763 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1764 {
1765 bfd_signed_vma *local_got;
1766 bfd_signed_vma *end_local_got;
1767 char *local_tls_type;
1768 bfd_size_type locsymcount;
1769 Elf_Internal_Shdr *symtab_hdr;
1770 asection *srela;
1771 struct plt_entry *local_plt;
1772 unsigned int i;
1773
1774 if (! is_s390_elf (ibfd))
1775 continue;
1776
1777 for (s = ibfd->sections; s != NULL; s = s->next)
1778 {
1779 struct elf_dyn_relocs *p;
1780
1781 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1782 {
1783 if (!bfd_is_abs_section (p->sec)
1784 && bfd_is_abs_section (p->sec->output_section))
1785 {
1786 /* Input section has been discarded, either because
1787 it is a copy of a linkonce section or due to
1788 linker script /DISCARD/, so we'll be discarding
1789 the relocs too. */
1790 }
1791 else if (p->count != 0)
1792 {
1793 srela = elf_section_data (p->sec)->sreloc;
1794 srela->size += p->count * sizeof (Elf64_External_Rela);
1795 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1796 info->flags |= DF_TEXTREL;
1797 }
1798 }
1799 }
1800
1801 local_got = elf_local_got_refcounts (ibfd);
1802 if (!local_got)
1803 continue;
1804
1805 symtab_hdr = &elf_symtab_hdr (ibfd);
1806 locsymcount = symtab_hdr->sh_info;
1807 end_local_got = local_got + locsymcount;
1808 local_tls_type = elf_s390_local_got_tls_type (ibfd);
1809 s = htab->elf.sgot;
1810 srela = htab->elf.srelgot;
1811 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1812 {
1813 if (*local_got > 0)
1814 {
1815 *local_got = s->size;
1816 s->size += GOT_ENTRY_SIZE;
1817 if (*local_tls_type == GOT_TLS_GD)
1818 s->size += GOT_ENTRY_SIZE;
1819 if (bfd_link_pic (info))
1820 srela->size += sizeof (Elf64_External_Rela);
1821 }
1822 else
1823 *local_got = (bfd_vma) -1;
1824 }
1825
1826 local_plt = elf_s390_local_plt (ibfd);
1827 for (i = 0; i < symtab_hdr->sh_info; i++)
1828 {
1829 if (local_plt[i].plt.refcount > 0)
1830 {
1831 local_plt[i].plt.offset = htab->elf.iplt->size;
1832 htab->elf.iplt->size += PLT_ENTRY_SIZE;
1833 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
1834 htab->elf.irelplt->size += sizeof (Elf64_External_Rela);
1835 }
1836 else
1837 local_plt[i].plt.offset = (bfd_vma) -1;
1838 }
1839 }
1840
1841 if (htab->tls_ldm_got.refcount > 0)
1842 {
1843 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
1844 relocs. */
1845 htab->tls_ldm_got.offset = htab->elf.sgot->size;
1846 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
1847 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1848 }
1849 else
1850 htab->tls_ldm_got.offset = -1;
1851
1852 /* Allocate global sym .plt and .got entries, and space for global
1853 sym dynamic relocs. */
1854 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
1855
1856 /* We now have determined the sizes of the various dynamic sections.
1857 Allocate memory for them. */
1858 relocs = false;
1859 for (s = dynobj->sections; s != NULL; s = s->next)
1860 {
1861 if ((s->flags & SEC_LINKER_CREATED) == 0)
1862 continue;
1863
1864 if (s == htab->elf.splt
1865 || s == htab->elf.sgot
1866 || s == htab->elf.sgotplt
1867 || s == htab->elf.sdynbss
1868 || s == htab->elf.sdynrelro
1869 || s == htab->elf.iplt
1870 || s == htab->elf.igotplt
1871 || s == htab->irelifunc)
1872 {
1873 /* Strip this section if we don't need it; see the
1874 comment below. */
1875 }
1876 else if (startswith (bfd_section_name (s), ".rela"))
1877 {
1878 if (s->size != 0 && s != htab->elf.srelplt)
1879 {
1880 relocs = true;
1881 if (s == htab->elf.irelplt)
1882 {
1883 /* In static-pie case, there are IRELATIVE-relocs in
1884 .rela.iplt (htab->irelplt), which will later be grouped
1885 to .rela.plt. On s390, the IRELATIVE relocations are
1886 always located in .rela.iplt - even for non-static case.
1887 Ensure that DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ is added
1888 to the dynamic section even if htab->srelplt->size == 0.
1889 See _bfd_elf_add_dynamic_tags in bfd/elflink.c. */
1890 htab->elf.dt_jmprel_required = true;
1891 }
1892 }
1893
1894 /* We use the reloc_count field as a counter if we need
1895 to copy relocs into the output file. */
1896 s->reloc_count = 0;
1897 }
1898 else
1899 {
1900 /* It's not one of our sections, so don't allocate space. */
1901 continue;
1902 }
1903
1904 if (s->size == 0)
1905 {
1906 /* If we don't need this section, strip it from the
1907 output file. This is to handle .rela.bss and
1908 .rela.plt. We must create it in
1909 create_dynamic_sections, because it must be created
1910 before the linker maps input sections to output
1911 sections. The linker does that before
1912 adjust_dynamic_symbol is called, and it is that
1913 function which decides whether anything needs to go
1914 into these sections. */
1915
1916 s->flags |= SEC_EXCLUDE;
1917 continue;
1918 }
1919
1920 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1921 continue;
1922
1923 /* Allocate memory for the section contents. We use bfd_zalloc
1924 here in case unused entries are not reclaimed before the
1925 section's contents are written out. This should not happen,
1926 but this way if it does, we get a R_390_NONE reloc instead
1927 of garbage. */
1928 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1929 if (s->contents == NULL)
1930 return false;
1931 }
1932
1933 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1934 }
1935
1936 /* Return the base VMA address which should be subtracted from real addresses
1937 when resolving @dtpoff relocation.
1938 This is PT_TLS segment p_vaddr. */
1939
1940 static bfd_vma
dtpoff_base(struct bfd_link_info * info)1941 dtpoff_base (struct bfd_link_info *info)
1942 {
1943 /* If tls_sec is NULL, we should have signalled an error already. */
1944 if (elf_hash_table (info)->tls_sec == NULL)
1945 return 0;
1946 return elf_hash_table (info)->tls_sec->vma;
1947 }
1948
1949 /* Return the relocation value for @tpoff relocation
1950 if STT_TLS virtual address is ADDRESS. */
1951
1952 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)1953 tpoff (struct bfd_link_info *info, bfd_vma address)
1954 {
1955 struct elf_link_hash_table *htab = elf_hash_table (info);
1956
1957 /* If tls_sec is NULL, we should have signalled an error already. */
1958 if (htab->tls_sec == NULL)
1959 return 0;
1960 return htab->tls_size + htab->tls_sec->vma - address;
1961 }
1962
1963 /* Complain if TLS instruction relocation is against an invalid
1964 instruction. */
1965
1966 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)1967 invalid_tls_insn (bfd *input_bfd,
1968 asection *input_section,
1969 Elf_Internal_Rela *rel)
1970 {
1971 reloc_howto_type *howto;
1972
1973 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
1974 _bfd_error_handler
1975 /* xgettext:c-format */
1976 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
1977 input_bfd,
1978 input_section,
1979 (uint64_t) rel->r_offset,
1980 howto->name);
1981 bfd_set_error (bfd_error_bad_value);
1982 }
1983
1984 /* Relocate a 390 ELF section. */
1985
1986 static int
elf_s390_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)1987 elf_s390_relocate_section (bfd *output_bfd,
1988 struct bfd_link_info *info,
1989 bfd *input_bfd,
1990 asection *input_section,
1991 bfd_byte *contents,
1992 Elf_Internal_Rela *relocs,
1993 Elf_Internal_Sym *local_syms,
1994 asection **local_sections)
1995 {
1996 struct elf_s390_link_hash_table *htab;
1997 Elf_Internal_Shdr *symtab_hdr;
1998 struct elf_link_hash_entry **sym_hashes;
1999 bfd_vma *local_got_offsets;
2000 Elf_Internal_Rela *rel;
2001 Elf_Internal_Rela *relend;
2002
2003 if (!is_s390_elf (input_bfd))
2004 {
2005 bfd_set_error (bfd_error_wrong_format);
2006 return false;
2007 }
2008
2009 htab = elf_s390_hash_table (info);
2010 if (htab == NULL)
2011 return false;
2012
2013 symtab_hdr = &elf_symtab_hdr (input_bfd);
2014 sym_hashes = elf_sym_hashes (input_bfd);
2015 local_got_offsets = elf_local_got_offsets (input_bfd);
2016
2017 rel = relocs;
2018 relend = relocs + input_section->reloc_count;
2019 for (; rel < relend; rel++)
2020 {
2021 unsigned int r_type;
2022 reloc_howto_type *howto;
2023 unsigned long r_symndx;
2024 struct elf_link_hash_entry *h;
2025 Elf_Internal_Sym *sym;
2026 asection *sec;
2027 bfd_vma off;
2028 bfd_vma relocation;
2029 bool unresolved_reloc;
2030 bfd_reloc_status_type r;
2031 int tls_type;
2032 bool resolved_to_zero;
2033
2034 r_type = ELF64_R_TYPE (rel->r_info);
2035 if (r_type == (int) R_390_GNU_VTINHERIT
2036 || r_type == (int) R_390_GNU_VTENTRY)
2037 continue;
2038 if (r_type >= (int) R_390_max)
2039 {
2040 bfd_set_error (bfd_error_bad_value);
2041 return false;
2042 }
2043
2044 howto = elf_howto_table + r_type;
2045 r_symndx = ELF64_R_SYM (rel->r_info);
2046
2047 h = NULL;
2048 sym = NULL;
2049 sec = NULL;
2050 unresolved_reloc = false;
2051 if (r_symndx < symtab_hdr->sh_info)
2052 {
2053 sym = local_syms + r_symndx;
2054 sec = local_sections[r_symndx];
2055
2056 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2057 {
2058 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2059 if (local_plt == NULL)
2060 return false;
2061
2062 /* Address of the PLT slot. */
2063 relocation = (htab->elf.iplt->output_section->vma
2064 + htab->elf.iplt->output_offset
2065 + local_plt[r_symndx].plt.offset);
2066
2067 switch (r_type)
2068 {
2069 case R_390_PLTOFF16:
2070 case R_390_PLTOFF32:
2071 case R_390_PLTOFF64:
2072 relocation -= s390_got_pointer (info);
2073 break;
2074 case R_390_GOTPLT12:
2075 case R_390_GOTPLT16:
2076 case R_390_GOTPLT20:
2077 case R_390_GOTPLT32:
2078 case R_390_GOTPLT64:
2079 case R_390_GOTPLTENT:
2080 case R_390_GOT12:
2081 case R_390_GOT16:
2082 case R_390_GOT20:
2083 case R_390_GOT32:
2084 case R_390_GOT64:
2085 case R_390_GOTENT:
2086 {
2087 /* Write the PLT slot address into the GOT slot. */
2088 bfd_put_64 (output_bfd, relocation,
2089 htab->elf.sgot->contents +
2090 local_got_offsets[r_symndx]);
2091 relocation = (local_got_offsets[r_symndx] +
2092 s390_got_offset (info));
2093
2094 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2095 relocation += s390_got_pointer (info);
2096 break;
2097 }
2098 default:
2099 break;
2100 }
2101 /* The output section is needed later in
2102 finish_dynamic_section when creating the dynamic
2103 relocation. */
2104 local_plt[r_symndx].sec = sec;
2105 goto do_relocation;
2106 }
2107 else
2108 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2109 }
2110 else
2111 {
2112 bool warned ATTRIBUTE_UNUSED;
2113 bool ignored ATTRIBUTE_UNUSED;
2114
2115 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2116 r_symndx, symtab_hdr, sym_hashes,
2117 h, sec, relocation,
2118 unresolved_reloc, warned, ignored);
2119 }
2120
2121 if (sec != NULL && discarded_section (sec))
2122 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2123 rel, 1, relend, howto, 0, contents);
2124
2125 if (bfd_link_relocatable (info))
2126 continue;
2127
2128 resolved_to_zero = (h != NULL
2129 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
2130
2131 switch (r_type)
2132 {
2133 case R_390_GOTPLT12:
2134 case R_390_GOTPLT16:
2135 case R_390_GOTPLT20:
2136 case R_390_GOTPLT32:
2137 case R_390_GOTPLT64:
2138 case R_390_GOTPLTENT:
2139 /* There are three cases for a GOTPLT relocation. 1) The
2140 relocation is against the jump slot entry of a plt that
2141 will get emitted to the output file. 2) The relocation
2142 is against the jump slot of a plt entry that has been
2143 removed. elf_s390_adjust_gotplt has created a GOT entry
2144 as replacement. 3) The relocation is against a local symbol.
2145 Cases 2) and 3) are the same as the GOT relocation code
2146 so we just have to test for case 1 and fall through for
2147 the other two. */
2148 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2149 {
2150 bfd_vma plt_index;
2151
2152 if (s390_is_ifunc_symbol_p (h))
2153 {
2154 /* Entry indices of .iplt and .igot.plt match
2155 1:1. No magic PLT first entry here. */
2156 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2157 relocation = (plt_index * GOT_ENTRY_SIZE
2158 + s390_gotplt_offset (info)
2159 + htab->elf.igotplt->output_offset);
2160 }
2161 else
2162 {
2163 plt_index = ((h->plt.offset - PLT_FIRST_ENTRY_SIZE)
2164 / PLT_ENTRY_SIZE);
2165
2166 relocation = (plt_index * GOT_ENTRY_SIZE
2167 + s390_gotplt_offset (info));
2168 }
2169 if (r_type == R_390_GOTPLTENT)
2170 relocation += s390_got_pointer (info);
2171 unresolved_reloc = false;
2172 break;
2173 }
2174 /* Fall through. */
2175
2176 case R_390_GOT12:
2177 case R_390_GOT16:
2178 case R_390_GOT20:
2179 case R_390_GOT32:
2180 case R_390_GOT64:
2181 case R_390_GOTENT:
2182 /* Relocation is to the entry for this symbol in the global
2183 offset table. */
2184 if (htab->elf.sgot == NULL)
2185 abort ();
2186
2187 if (h != NULL)
2188 {
2189 bool dyn;
2190
2191 off = h->got.offset;
2192 dyn = htab->elf.dynamic_sections_created;
2193
2194 if (s390_is_ifunc_symbol_p (h))
2195 {
2196 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2197 if (off == (bfd_vma)-1)
2198 {
2199 /* No explicit GOT usage so redirect to the
2200 got.iplt slot. */
2201 relocation = (s390_gotplt_offset (info)
2202 + htab->elf.igotplt->output_offset
2203 + (h->plt.offset / PLT_ENTRY_SIZE
2204 * GOT_ENTRY_SIZE));
2205
2206 /* For @GOTENT the relocation is against the offset between
2207 the instruction and the symbols entry in the GOT and not
2208 between the start of the GOT and the symbols entry. We
2209 add the vma of the GOT to get the correct value. */
2210 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2211 relocation += s390_got_pointer (info);
2212
2213 break;
2214 }
2215 else
2216 {
2217 /* Explicit GOT slots must contain the address
2218 of the PLT slot. This will be handled in
2219 finish_dynamic_symbol. */
2220 }
2221 }
2222 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2223 bfd_link_pic (info),
2224 h)
2225 || (bfd_link_pic (info)
2226 && SYMBOL_REFERENCES_LOCAL (info, h))
2227 || resolved_to_zero)
2228 {
2229 Elf_Internal_Sym *isym;
2230 asection *sym_sec;
2231
2232 /* This is actually a static link, or it is a
2233 -Bsymbolic link and the symbol is defined
2234 locally, or the symbol was forced to be local
2235 because of a version file. We must initialize
2236 this entry in the global offset table. Since the
2237 offset must always be a multiple of 2, we use the
2238 least significant bit to record whether we have
2239 initialized it already.
2240
2241 When doing a dynamic link, we create a .rel.got
2242 relocation entry to initialize the value. This
2243 is done in the finish_dynamic_symbol routine. */
2244 if ((off & 1) != 0)
2245 off &= ~1;
2246 else
2247 {
2248 bfd_put_64 (output_bfd, relocation,
2249 htab->elf.sgot->contents + off);
2250 h->got.offset |= 1;
2251 }
2252
2253 /* When turning a GOT slot dereference into a direct
2254 reference using larl we have to make sure that
2255 the symbol is 1. properly aligned and 2. it is no
2256 ABS symbol or will become one. */
2257 if ((h->def_regular
2258 && bfd_link_pic (info)
2259 && SYMBOL_REFERENCES_LOCAL (info, h))
2260 /* lgrl rx,sym@GOTENT -> larl rx, sym */
2261 && ((r_type == R_390_GOTENT
2262 && (bfd_get_16 (input_bfd,
2263 contents + rel->r_offset - 2)
2264 & 0xff0f) == 0xc408)
2265 /* lg rx, sym@GOT(r12) -> larl rx, sym */
2266 || (r_type == R_390_GOT20
2267 && (bfd_get_32 (input_bfd,
2268 contents + rel->r_offset - 2)
2269 & 0xff00f000) == 0xe300c000
2270 && bfd_get_8 (input_bfd,
2271 contents + rel->r_offset + 3) == 0x04))
2272 && (isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
2273 input_bfd, r_symndx))
2274 && isym->st_shndx != SHN_ABS
2275 && h != htab->elf.hdynamic
2276 && h != htab->elf.hgot
2277 && h != htab->elf.hplt
2278 && !(isym->st_value & 1)
2279 && (sym_sec = bfd_section_from_elf_index (input_bfd,
2280 isym->st_shndx))
2281 && sym_sec->alignment_power)
2282 {
2283 unsigned short new_insn =
2284 (0xc000 | (bfd_get_8 (input_bfd,
2285 contents + rel->r_offset - 1) & 0xf0));
2286 bfd_put_16 (output_bfd, new_insn,
2287 contents + rel->r_offset - 2);
2288 r_type = R_390_PC32DBL;
2289 rel->r_addend = 2;
2290 howto = elf_howto_table + r_type;
2291 relocation = h->root.u.def.value
2292 + h->root.u.def.section->output_section->vma
2293 + h->root.u.def.section->output_offset;
2294 goto do_relocation;
2295 }
2296 }
2297 else
2298 unresolved_reloc = false;
2299 }
2300 else
2301 {
2302 if (local_got_offsets == NULL)
2303 abort ();
2304
2305 off = local_got_offsets[r_symndx];
2306
2307 /* The offset must always be a multiple of 8. We use
2308 the least significant bit to record whether we have
2309 already generated the necessary reloc. */
2310 if ((off & 1) != 0)
2311 off &= ~1;
2312 else
2313 {
2314 bfd_put_64 (output_bfd, relocation,
2315 htab->elf.sgot->contents + off);
2316
2317 if (bfd_link_pic (info))
2318 {
2319 asection *s;
2320 Elf_Internal_Rela outrel;
2321 bfd_byte *loc;
2322
2323 s = htab->elf.srelgot;
2324 if (s == NULL)
2325 abort ();
2326
2327 outrel.r_offset = (htab->elf.sgot->output_section->vma
2328 + htab->elf.sgot->output_offset
2329 + off);
2330 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2331 outrel.r_addend = relocation;
2332 loc = s->contents;
2333 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2334 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2335 }
2336
2337 local_got_offsets[r_symndx] |= 1;
2338 }
2339 }
2340
2341 if (off >= (bfd_vma) -2)
2342 abort ();
2343
2344 relocation = s390_got_offset (info) + off;
2345
2346 /* For @GOTENT the relocation is against the offset between
2347 the instruction and the symbols entry in the GOT and not
2348 between the start of the GOT and the symbols entry. We
2349 add the vma of the GOT to get the correct value. */
2350 if ( r_type == R_390_GOTENT
2351 || r_type == R_390_GOTPLTENT)
2352 relocation += s390_got_pointer (info);
2353
2354 break;
2355
2356 case R_390_GOTOFF16:
2357 case R_390_GOTOFF32:
2358 case R_390_GOTOFF64:
2359 /* Relocation is relative to the start of the global offset
2360 table. */
2361
2362 if (h != NULL
2363 && s390_is_ifunc_symbol_p (h)
2364 && h->def_regular
2365 && !bfd_link_executable (info))
2366 {
2367 relocation = (htab->elf.iplt->output_section->vma
2368 + htab->elf.iplt->output_offset
2369 + h->plt.offset
2370 - s390_got_pointer (info));
2371 goto do_relocation;
2372 }
2373
2374 relocation -= s390_got_pointer (info);
2375 break;
2376
2377 case R_390_GOTPC:
2378 case R_390_GOTPCDBL:
2379 /* Use global offset table as symbol value. */
2380 relocation = s390_got_pointer (info);
2381 unresolved_reloc = false;
2382 break;
2383
2384 case R_390_PLT12DBL:
2385 case R_390_PLT16DBL:
2386 case R_390_PLT24DBL:
2387 case R_390_PLT32:
2388 case R_390_PLT32DBL:
2389 case R_390_PLT64:
2390 /* Relocation is to the entry for this symbol in the
2391 procedure linkage table. */
2392
2393 /* Resolve a PLT32 reloc against a local symbol directly,
2394 without using the procedure linkage table. */
2395 if (h == NULL)
2396 break;
2397
2398 if (h->plt.offset == (bfd_vma) -1
2399 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2400 {
2401 /* We didn't make a PLT entry for this symbol. This
2402 happens when statically linking PIC code, or when
2403 using -Bsymbolic. */
2404 break;
2405 }
2406 if (s390_is_ifunc_symbol_p (h))
2407 relocation = (htab->elf.iplt->output_section->vma
2408 + htab->elf.iplt->output_offset
2409 + h->plt.offset);
2410 else
2411 relocation = (htab->elf.splt->output_section->vma
2412 + htab->elf.splt->output_offset
2413 + h->plt.offset);
2414 unresolved_reloc = false;
2415 break;
2416
2417 case R_390_PLTOFF16:
2418 case R_390_PLTOFF32:
2419 case R_390_PLTOFF64:
2420 /* Relocation is to the entry for this symbol in the
2421 procedure linkage table relative to the start of the GOT. */
2422
2423 /* For local symbols or if we didn't make a PLT entry for
2424 this symbol resolve the symbol directly. */
2425 if (h == NULL
2426 || h->plt.offset == (bfd_vma) -1
2427 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2428 {
2429 relocation -= s390_got_pointer (info);
2430 break;
2431 }
2432
2433 if (s390_is_ifunc_symbol_p (h))
2434 relocation = (htab->elf.iplt->output_section->vma
2435 + htab->elf.iplt->output_offset
2436 + h->plt.offset
2437 - s390_got_pointer (info));
2438 else
2439 relocation = (htab->elf.splt->output_section->vma
2440 + htab->elf.splt->output_offset
2441 + h->plt.offset
2442 - s390_got_pointer (info));
2443 unresolved_reloc = false;
2444 break;
2445
2446 case R_390_PC16:
2447 case R_390_PC12DBL:
2448 case R_390_PC16DBL:
2449 case R_390_PC24DBL:
2450 case R_390_PC32:
2451 case R_390_PC32DBL:
2452 case R_390_PC64:
2453 if (h != NULL
2454 && bfd_link_pie (info)
2455 && !h->def_regular)
2456 {
2457 _bfd_error_handler (_("%pB: `%s' non-PLT reloc for symbol defined "
2458 "in shared library and accessed "
2459 "from executable "
2460 "(rebuild file with -fPIC ?)"),
2461 input_bfd, h->root.root.string);
2462 bfd_set_error (bfd_error_bad_value);
2463 return false;
2464 }
2465 /* The target of these relocs are instruction operands
2466 residing in read-only sections. We cannot emit a runtime
2467 reloc for it. */
2468 if (h != NULL
2469 && s390_is_ifunc_symbol_p (h)
2470 && h->def_regular
2471 && bfd_link_pic (info))
2472 {
2473 relocation = (htab->elf.iplt->output_section->vma
2474 + htab->elf.iplt->output_offset
2475 + h->plt.offset);
2476 goto do_relocation;
2477 }
2478
2479 /* Replace relative long addressing instructions of weak
2480 symbols, which will definitely resolve to zero, with
2481 either a load address of 0, a NOP, or a trapping insn.
2482 This prevents the PC32DBL relocation from overflowing in
2483 case the binary will be loaded at 4GB or more. */
2484 if (h != NULL
2485 && h->root.type == bfd_link_hash_undefweak
2486 && !h->root.linker_def
2487 && (bfd_link_executable (info)
2488 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2489 && r_type == R_390_PC32DBL
2490 && rel->r_offset >= 2)
2491 {
2492 void *insn_start = contents + rel->r_offset - 2;
2493 uint16_t op = bfd_get_16 (input_bfd, insn_start) & 0xff0f;
2494 uint8_t reg = bfd_get_8 (input_bfd, insn_start + 1) & 0xf0;
2495
2496 /* NOTE: The order of the if's is important! */
2497 /* Replace load address relative long (larl) with load
2498 address (lay) */
2499 if (op == 0xc000)
2500 {
2501 /* larl rX,<weak sym> -> lay rX,0(0) */
2502 bfd_put_16 (output_bfd, 0xe300 | reg, insn_start);
2503 bfd_put_32 (output_bfd, 0x71, insn_start + 2);
2504 continue;
2505 }
2506 /* Replace prefetch data relative long (pfdrl) with a NOP */
2507 else if (op == 0xc602)
2508 {
2509 /* Emit a 6-byte NOP: jgnop . */
2510 bfd_put_16 (output_bfd, 0xc004, insn_start);
2511 bfd_put_32 (output_bfd, 0x0, insn_start + 2);
2512 continue;
2513 }
2514 /* Replace the following instructions with a trap:
2515 - branch relative and save long (brasl)
2516 - load (logical) relative long (lrl, lgrl, lgfrl, llgfrl)
2517 - load (logical) halfword relative long (lhrl, lghrl, llhrl, llghrl)
2518 - store relative long (strl, stgrl)
2519 - store halfword relative long (sthrl)
2520 - execute relative long (exrl)
2521 - compare (logical) relative long (crl, clrl, cgrl, clgrl, cgfrl, clgfrl)
2522 - compare (logical) halfword relative long (chrl, cghrl, clhrl, clghrl)
2523 - branch relative on count high (brcth) */
2524 else if (op == 0xc005 || (op & 0xff00) == 0xc400
2525 || (op & 0xff00) == 0xc600 || op == 0xcc06)
2526 {
2527 /* Emit a 6-byte trap: jg .+2 */
2528 bfd_put_16 (output_bfd, 0xc0f4, insn_start);
2529 bfd_put_32 (output_bfd, 0x1, insn_start + 2);
2530 continue;
2531 }
2532 }
2533 /* Fall through. */
2534
2535 case R_390_8:
2536 case R_390_16:
2537 case R_390_32:
2538 case R_390_64:
2539
2540 if ((input_section->flags & SEC_ALLOC) == 0)
2541 break;
2542
2543 if (h != NULL
2544 && s390_is_ifunc_symbol_p (h)
2545 && h->def_regular)
2546 {
2547 if (!bfd_link_pic (info))
2548 {
2549 /* For a non-shared object the symbol will not
2550 change. Hence we can write the address of the
2551 target IPLT slot now. */
2552 relocation = (htab->elf.iplt->output_section->vma
2553 + htab->elf.iplt->output_offset
2554 + h ->plt.offset);
2555 goto do_relocation;
2556 }
2557 else
2558 {
2559 /* For shared objects a runtime relocation is needed. */
2560
2561 Elf_Internal_Rela outrel;
2562 asection *sreloc;
2563
2564 /* Need a dynamic relocation to get the real function
2565 address. */
2566 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2567 info,
2568 input_section,
2569 rel->r_offset);
2570 if (outrel.r_offset == (bfd_vma) -1
2571 || outrel.r_offset == (bfd_vma) -2)
2572 abort ();
2573
2574 outrel.r_offset += (input_section->output_section->vma
2575 + input_section->output_offset);
2576
2577 if (h->dynindx == -1
2578 || h->forced_local
2579 || bfd_link_executable (info))
2580 {
2581 /* This symbol is resolved locally. */
2582 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
2583 outrel.r_addend = (h->root.u.def.value
2584 + h->root.u.def.section->output_section->vma
2585 + h->root.u.def.section->output_offset);
2586 }
2587 else
2588 {
2589 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2590 outrel.r_addend = 0;
2591 }
2592
2593 sreloc = htab->elf.irelifunc;
2594 elf_append_rela (output_bfd, sreloc, &outrel);
2595
2596 /* If this reloc is against an external symbol, we
2597 do not want to fiddle with the addend. Otherwise,
2598 we need to include the symbol value so that it
2599 becomes an addend for the dynamic reloc. For an
2600 internal symbol, we have updated addend. */
2601 continue;
2602 }
2603 }
2604
2605 if ((bfd_link_pic (info)
2606 && (h == NULL
2607 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2608 && !resolved_to_zero)
2609 || h->root.type != bfd_link_hash_undefweak)
2610 && ((r_type != R_390_PC16
2611 && r_type != R_390_PC12DBL
2612 && r_type != R_390_PC16DBL
2613 && r_type != R_390_PC24DBL
2614 && r_type != R_390_PC32
2615 && r_type != R_390_PC32DBL
2616 && r_type != R_390_PC64)
2617 || !SYMBOL_CALLS_LOCAL (info, h)))
2618 || (ELIMINATE_COPY_RELOCS
2619 && !bfd_link_pic (info)
2620 && h != NULL
2621 && h->dynindx != -1
2622 && !h->non_got_ref
2623 && ((h->def_dynamic
2624 && !h->def_regular)
2625 || h->root.type == bfd_link_hash_undefweak
2626 || h->root.type == bfd_link_hash_undefined)))
2627 {
2628 Elf_Internal_Rela outrel;
2629 bool skip, relocate;
2630 asection *sreloc;
2631 bfd_byte *loc;
2632
2633 /* When generating a shared object, these relocations
2634 are copied into the output file to be resolved at run
2635 time. */
2636 skip = false;
2637 relocate = false;
2638
2639 outrel.r_offset =
2640 _bfd_elf_section_offset (output_bfd, info, input_section,
2641 rel->r_offset);
2642 if (outrel.r_offset == (bfd_vma) -1)
2643 skip = true;
2644 else if (outrel.r_offset == (bfd_vma) -2)
2645 skip = true, relocate = true;
2646
2647 outrel.r_offset += (input_section->output_section->vma
2648 + input_section->output_offset);
2649
2650 if (skip)
2651 memset (&outrel, 0, sizeof outrel);
2652 else if (h != NULL
2653 && h->dynindx != -1
2654 && (r_type == R_390_PC16
2655 || r_type == R_390_PC12DBL
2656 || r_type == R_390_PC16DBL
2657 || r_type == R_390_PC24DBL
2658 || r_type == R_390_PC32
2659 || r_type == R_390_PC32DBL
2660 || r_type == R_390_PC64
2661 || !bfd_link_pic (info)
2662 || !SYMBOLIC_BIND (info, h)
2663 || !h->def_regular))
2664 {
2665 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2666 outrel.r_addend = rel->r_addend;
2667 }
2668 else
2669 {
2670 /* This symbol is local, or marked to become local. */
2671 outrel.r_addend = relocation + rel->r_addend;
2672 if (r_type == R_390_64)
2673 {
2674 relocate = true;
2675 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2676 }
2677 else
2678 {
2679 long sindx;
2680
2681 if (bfd_is_abs_section (sec))
2682 sindx = 0;
2683 else if (sec == NULL || sec->owner == NULL)
2684 {
2685 bfd_set_error(bfd_error_bad_value);
2686 return false;
2687 }
2688 else
2689 {
2690 asection *osec;
2691
2692 osec = sec->output_section;
2693 sindx = elf_section_data (osec)->dynindx;
2694
2695 if (sindx == 0)
2696 {
2697 osec = htab->elf.text_index_section;
2698 sindx = elf_section_data (osec)->dynindx;
2699 }
2700 BFD_ASSERT (sindx != 0);
2701
2702 /* We are turning this relocation into one
2703 against a section symbol, so subtract out
2704 the output section's address but not the
2705 offset of the input section in the output
2706 section. */
2707 outrel.r_addend -= osec->vma;
2708 }
2709 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2710 }
2711 }
2712
2713 sreloc = elf_section_data (input_section)->sreloc;
2714 if (sreloc == NULL)
2715 abort ();
2716
2717 loc = sreloc->contents;
2718 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2719 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2720
2721 /* If this reloc is against an external symbol, we do
2722 not want to fiddle with the addend. Otherwise, we
2723 need to include the symbol value so that it becomes
2724 an addend for the dynamic reloc. */
2725 if (! relocate)
2726 continue;
2727 }
2728
2729 break;
2730
2731 /* Relocations for tls literal pool entries. */
2732 case R_390_TLS_IE64:
2733 if (bfd_link_dll (info))
2734 {
2735 Elf_Internal_Rela outrel;
2736 asection *sreloc;
2737 bfd_byte *loc;
2738
2739 outrel.r_offset = rel->r_offset
2740 + input_section->output_section->vma
2741 + input_section->output_offset;
2742 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2743 sreloc = elf_section_data (input_section)->sreloc;
2744 if (sreloc == NULL)
2745 abort ();
2746 loc = sreloc->contents;
2747 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2748 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2749 }
2750 /* Fall through. */
2751
2752 case R_390_TLS_GD64:
2753 case R_390_TLS_GOTIE64:
2754 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2755 tls_type = GOT_UNKNOWN;
2756 if (h == NULL && local_got_offsets)
2757 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2758 else if (h != NULL)
2759 {
2760 tls_type = elf_s390_hash_entry(h)->tls_type;
2761 if (!bfd_link_dll (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2762 r_type = R_390_TLS_LE64;
2763 }
2764 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2765 r_type = R_390_TLS_IE64;
2766
2767 if (r_type == R_390_TLS_LE64)
2768 {
2769 /* This relocation gets optimized away by the local exec
2770 access optimization. */
2771 BFD_ASSERT (! unresolved_reloc);
2772 bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2773 contents + rel->r_offset);
2774 continue;
2775 }
2776
2777 if (htab->elf.sgot == NULL)
2778 abort ();
2779
2780 if (h != NULL)
2781 off = h->got.offset;
2782 else
2783 {
2784 if (local_got_offsets == NULL)
2785 abort ();
2786
2787 off = local_got_offsets[r_symndx];
2788 }
2789
2790 emit_tls_relocs:
2791
2792 if ((off & 1) != 0)
2793 off &= ~1;
2794 else
2795 {
2796 Elf_Internal_Rela outrel;
2797 bfd_byte *loc;
2798 int dr_type, indx;
2799
2800 if (htab->elf.srelgot == NULL)
2801 abort ();
2802
2803 outrel.r_offset = (htab->elf.sgot->output_section->vma
2804 + htab->elf.sgot->output_offset + off);
2805
2806 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2807 if (r_type == R_390_TLS_GD64)
2808 dr_type = R_390_TLS_DTPMOD;
2809 else
2810 dr_type = R_390_TLS_TPOFF;
2811 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2812 outrel.r_addend = relocation - dtpoff_base (info);
2813 else
2814 outrel.r_addend = 0;
2815 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2816 loc = htab->elf.srelgot->contents;
2817 loc += htab->elf.srelgot->reloc_count++
2818 * sizeof (Elf64_External_Rela);
2819 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2820
2821 if (r_type == R_390_TLS_GD64)
2822 {
2823 if (indx == 0)
2824 {
2825 BFD_ASSERT (! unresolved_reloc);
2826 bfd_put_64 (output_bfd,
2827 relocation - dtpoff_base (info),
2828 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2829 }
2830 else
2831 {
2832 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2833 outrel.r_offset += GOT_ENTRY_SIZE;
2834 outrel.r_addend = 0;
2835 htab->elf.srelgot->reloc_count++;
2836 loc += sizeof (Elf64_External_Rela);
2837 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2838 }
2839 }
2840
2841 if (h != NULL)
2842 h->got.offset |= 1;
2843 else
2844 local_got_offsets[r_symndx] |= 1;
2845 }
2846
2847 if (off >= (bfd_vma) -2)
2848 abort ();
2849 if (r_type == ELF64_R_TYPE (rel->r_info))
2850 {
2851 relocation = htab->elf.sgot->output_offset + off;
2852 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2853 relocation += htab->elf.sgot->output_section->vma;
2854 unresolved_reloc = false;
2855 }
2856 else
2857 {
2858 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
2859 contents + rel->r_offset);
2860 continue;
2861 }
2862 break;
2863
2864 case R_390_TLS_GOTIE12:
2865 case R_390_TLS_GOTIE20:
2866 case R_390_TLS_IEENT:
2867 if (h == NULL)
2868 {
2869 if (local_got_offsets == NULL)
2870 abort();
2871 off = local_got_offsets[r_symndx];
2872 if (bfd_link_dll (info))
2873 goto emit_tls_relocs;
2874 }
2875 else
2876 {
2877 off = h->got.offset;
2878 tls_type = elf_s390_hash_entry(h)->tls_type;
2879 if (bfd_link_dll (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2880 goto emit_tls_relocs;
2881 }
2882
2883 if (htab->elf.sgot == NULL)
2884 abort ();
2885
2886 BFD_ASSERT (! unresolved_reloc);
2887 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2888 htab->elf.sgot->contents + off);
2889 relocation = htab->elf.sgot->output_offset + off;
2890 if (r_type == R_390_TLS_IEENT)
2891 relocation += htab->elf.sgot->output_section->vma;
2892 unresolved_reloc = false;
2893 break;
2894
2895 case R_390_TLS_LDM64:
2896 if (! bfd_link_dll (info))
2897 /* The literal pool entry this relocation refers to gets ignored
2898 by the optimized code of the local exec model. Do nothing
2899 and the value will turn out zero. */
2900 continue;
2901
2902 if (htab->elf.sgot == NULL)
2903 abort ();
2904
2905 off = htab->tls_ldm_got.offset;
2906 if (off & 1)
2907 off &= ~1;
2908 else
2909 {
2910 Elf_Internal_Rela outrel;
2911 bfd_byte *loc;
2912
2913 if (htab->elf.srelgot == NULL)
2914 abort ();
2915
2916 outrel.r_offset = (htab->elf.sgot->output_section->vma
2917 + htab->elf.sgot->output_offset + off);
2918
2919 bfd_put_64 (output_bfd, 0,
2920 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2921 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2922 outrel.r_addend = 0;
2923 loc = htab->elf.srelgot->contents;
2924 loc += htab->elf.srelgot->reloc_count++
2925 * sizeof (Elf64_External_Rela);
2926 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2927 htab->tls_ldm_got.offset |= 1;
2928 }
2929 relocation = htab->elf.sgot->output_offset + off;
2930 unresolved_reloc = false;
2931 break;
2932
2933 case R_390_TLS_LE64:
2934 if (bfd_link_dll (info))
2935 {
2936 /* Linking a shared library with non-fpic code requires
2937 a R_390_TLS_TPOFF relocation. */
2938 Elf_Internal_Rela outrel;
2939 asection *sreloc;
2940 bfd_byte *loc;
2941 int indx;
2942
2943 outrel.r_offset = rel->r_offset
2944 + input_section->output_section->vma
2945 + input_section->output_offset;
2946 if (h != NULL && h->dynindx != -1)
2947 indx = h->dynindx;
2948 else
2949 indx = 0;
2950 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2951 if (indx == 0)
2952 outrel.r_addend = relocation - dtpoff_base (info);
2953 else
2954 outrel.r_addend = 0;
2955 sreloc = elf_section_data (input_section)->sreloc;
2956 if (sreloc == NULL)
2957 abort ();
2958 loc = sreloc->contents;
2959 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2960 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2961 }
2962 else
2963 {
2964 BFD_ASSERT (! unresolved_reloc);
2965 bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
2966 contents + rel->r_offset);
2967 }
2968 continue;
2969
2970 case R_390_TLS_LDO64:
2971 if (bfd_link_dll (info) || (input_section->flags & SEC_DEBUGGING))
2972 relocation -= dtpoff_base (info);
2973 else
2974 /* When converting LDO to LE, we must negate. */
2975 relocation = -tpoff (info, relocation);
2976 break;
2977
2978 /* Relocations for tls instructions. */
2979 case R_390_TLS_LOAD:
2980 case R_390_TLS_GDCALL:
2981 case R_390_TLS_LDCALL:
2982 tls_type = GOT_UNKNOWN;
2983 if (h == NULL && local_got_offsets)
2984 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2985 else if (h != NULL)
2986 tls_type = elf_s390_hash_entry(h)->tls_type;
2987
2988 if (tls_type == GOT_TLS_GD)
2989 continue;
2990
2991 if (r_type == R_390_TLS_LOAD)
2992 {
2993 if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1))
2994 {
2995 /* IE->LE transition. Four valid cases:
2996 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2997 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2998 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2999 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
3000 unsigned int insn0, insn1, ry;
3001
3002 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3003 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3004 if (insn1 != 0x0004)
3005 {
3006 invalid_tls_insn (input_bfd, input_section, rel);
3007 return false;
3008 }
3009 if ((insn0 & 0xff00f000) == 0xe3000000)
3010 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
3011 ry = (insn0 & 0x000f0000);
3012 else if ((insn0 & 0xff0f0000) == 0xe3000000)
3013 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
3014 ry = (insn0 & 0x0000f000) << 4;
3015 else if ((insn0 & 0xff00f000) == 0xe300c000)
3016 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
3017 ry = (insn0 & 0x000f0000);
3018 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
3019 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
3020 ry = (insn0 & 0x0000f000) << 4;
3021 else
3022 {
3023 invalid_tls_insn (input_bfd, input_section, rel);
3024 return false;
3025 }
3026 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
3027 insn1 = 0x000d;
3028 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3029 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3030 }
3031 }
3032 else if (r_type == R_390_TLS_GDCALL)
3033 {
3034 unsigned int insn0, insn1;
3035
3036 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3037 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3038 if ((insn0 & 0xffff0000) != 0xc0e50000)
3039 {
3040 invalid_tls_insn (input_bfd, input_section, rel);
3041 return false;
3042 }
3043 if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1))
3044 {
3045 /* GD->LE transition.
3046 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3047 insn0 = 0xc0040000;
3048 insn1 = 0x0000;
3049 }
3050 else
3051 {
3052 /* GD->IE transition.
3053 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
3054 insn0 = 0xe322c000;
3055 insn1 = 0x0004;
3056 }
3057 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3058 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3059 }
3060 else if (r_type == R_390_TLS_LDCALL)
3061 {
3062 if (!bfd_link_dll (info))
3063 {
3064 unsigned int insn0, insn1;
3065
3066 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3067 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3068 if ((insn0 & 0xffff0000) != 0xc0e50000)
3069 {
3070 invalid_tls_insn (input_bfd, input_section, rel);
3071 return false;
3072 }
3073 /* LD->LE transition.
3074 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3075 insn0 = 0xc0040000;
3076 insn1 = 0x0000;
3077 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3078 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3079 }
3080 }
3081 continue;
3082
3083 default:
3084 break;
3085 }
3086
3087 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3088 because such sections are not SEC_ALLOC and thus ld.so will
3089 not process them. */
3090 if (unresolved_reloc
3091 && !((input_section->flags & SEC_DEBUGGING) != 0
3092 && h->def_dynamic)
3093 && _bfd_elf_section_offset (output_bfd, info, input_section,
3094 rel->r_offset) != (bfd_vma) -1)
3095 _bfd_error_handler
3096 /* xgettext:c-format */
3097 (_("%pB(%pA+%#" PRIx64 "): "
3098 "unresolvable %s relocation against symbol `%s'"),
3099 input_bfd,
3100 input_section,
3101 (uint64_t) rel->r_offset,
3102 howto->name,
3103 h->root.root.string);
3104
3105 do_relocation:
3106
3107 /* When applying a 24 bit reloc we need to start one byte
3108 earlier. Otherwise the 32 bit get/put bfd operations might
3109 access a byte after the actual section. */
3110 if (r_type == R_390_PC24DBL
3111 || r_type == R_390_PLT24DBL)
3112 rel->r_offset--;
3113
3114 /* Issue an error if the right shift implied by the relocation
3115 would drop bits from the symbol value. */
3116 if (howto->rightshift
3117 && (relocation & (((bfd_vma)1 << howto->rightshift) - 1)))
3118 {
3119 _bfd_error_handler
3120 /* xgettext:c-format */
3121 (_("%pB(%pA+%#" PRIx64 "): "
3122 "misaligned symbol `%s' (%#" PRIx64 ") for relocation %s"),
3123 input_bfd,
3124 input_section,
3125 (uint64_t) rel->r_offset,
3126 h->root.root.string,
3127 (uint64_t)relocation,
3128 howto->name);
3129 return false;
3130 }
3131
3132 if (r_type == R_390_20
3133 || r_type == R_390_GOT20
3134 || r_type == R_390_GOTPLT20
3135 || r_type == R_390_TLS_GOTIE20)
3136 {
3137 relocation += rel->r_addend;
3138 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3139 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3140 contents, rel->r_offset,
3141 relocation, 0);
3142 }
3143 else
3144 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3145 contents, rel->r_offset,
3146 relocation, rel->r_addend);
3147
3148 if (r != bfd_reloc_ok)
3149 {
3150 const char *name;
3151
3152 if (h != NULL)
3153 name = h->root.root.string;
3154 else
3155 {
3156 name = bfd_elf_string_from_elf_section (input_bfd,
3157 symtab_hdr->sh_link,
3158 sym->st_name);
3159 if (name == NULL)
3160 return false;
3161 if (*name == '\0')
3162 name = bfd_section_name (sec);
3163 }
3164
3165 if (r == bfd_reloc_overflow)
3166 (*info->callbacks->reloc_overflow)
3167 (info, (h ? &h->root : NULL), name, howto->name,
3168 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3169 else
3170 {
3171 _bfd_error_handler
3172 /* xgettext:c-format */
3173 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3174 input_bfd, input_section,
3175 (uint64_t) rel->r_offset, name, (int) r);
3176 return false;
3177 }
3178 }
3179 }
3180
3181 return true;
3182 }
3183
3184 /* Generate the PLT slots together with the dynamic relocations needed
3185 for IFUNC symbols. */
3186
3187 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)3188 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3189 struct bfd_link_info *info,
3190 struct elf_link_hash_entry *h,
3191 struct elf_s390_link_hash_table *htab,
3192 bfd_vma plt_offset,
3193 bfd_vma resolver_address)
3194 {
3195 bfd_vma plt_index;
3196 bfd_vma got_offset;
3197 Elf_Internal_Rela rela;
3198 bfd_byte *loc;
3199 asection *plt, *gotplt, *relplt;
3200
3201 if (htab->elf.iplt == NULL
3202 || htab->elf.igotplt == NULL
3203 || htab->elf.irelplt == NULL)
3204 abort ();
3205
3206 /* Index of the PLT slot within iplt section. */
3207 plt_index = plt_offset / PLT_ENTRY_SIZE;
3208 plt = htab->elf.iplt;
3209 /* Offset into the igot.plt section. */
3210 got_offset = plt_index * GOT_ENTRY_SIZE;
3211 gotplt = htab->elf.igotplt;
3212 relplt = htab->elf.irelplt;
3213
3214 /* Fill in the blueprint of a PLT. */
3215 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
3216 PLT_ENTRY_SIZE);
3217
3218 /* Fixup the relative address to the GOT entry */
3219 bfd_put_32 (output_bfd,
3220 (gotplt->output_section->vma +
3221 gotplt->output_offset + got_offset
3222 - (plt->output_section->vma +
3223 plt->output_offset +
3224 plt_offset))/2,
3225 plt->contents + plt_offset + 2);
3226 /* Fixup the relative branch to PLT 0 */
3227 bfd_put_32 (output_bfd, - (plt->output_offset +
3228 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3229 plt->contents + plt_offset + 24);
3230 /* Fixup offset into .rela.plt section. */
3231 bfd_put_32 (output_bfd, relplt->output_offset +
3232 plt_index * sizeof (Elf64_External_Rela),
3233 plt->contents + plt_offset + 28);
3234
3235 /* Fill in the entry in the global offset table.
3236 Points to instruction after GOT offset. */
3237 bfd_put_64 (output_bfd,
3238 (plt->output_section->vma
3239 + plt->output_offset
3240 + plt_offset
3241 + 14),
3242 gotplt->contents + got_offset);
3243
3244 /* Fill in the entry in the .rela.plt section. */
3245 rela.r_offset = (gotplt->output_section->vma
3246 + gotplt->output_offset
3247 + got_offset);
3248
3249 if (!h
3250 || h->dynindx == -1
3251 || ((bfd_link_executable (info)
3252 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3253 && h->def_regular))
3254 {
3255 /* The symbol can be locally resolved. */
3256 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
3257 rela.r_addend = resolver_address;
3258 }
3259 else
3260 {
3261 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3262 rela.r_addend = 0;
3263 }
3264
3265 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3266 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3267 }
3268
3269
3270 /* Finish up dynamic symbol handling. We set the contents of various
3271 dynamic sections here. */
3272
3273 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)3274 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3275 struct bfd_link_info *info,
3276 struct elf_link_hash_entry *h,
3277 Elf_Internal_Sym *sym)
3278 {
3279 struct elf_s390_link_hash_table *htab;
3280 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3281
3282 htab = elf_s390_hash_table (info);
3283
3284 if (h->plt.offset != (bfd_vma) -1)
3285 {
3286 bfd_vma plt_index;
3287 bfd_vma gotplt_offset;
3288 Elf_Internal_Rela rela;
3289 bfd_byte *loc;
3290
3291 /* This symbol has an entry in the procedure linkage table. Set
3292 it up. */
3293 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3294 {
3295 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3296 htab, h->plt.offset,
3297 eh->ifunc_resolver_address +
3298 eh->ifunc_resolver_section->output_offset +
3299 eh->ifunc_resolver_section->output_section->vma);
3300
3301 /* Do not return yet. Handling of explicit GOT slots of
3302 IFUNC symbols is below. */
3303 }
3304 else
3305 {
3306 if (h->dynindx == -1
3307 || htab->elf.splt == NULL
3308 || htab->elf.sgotplt == NULL
3309 || htab->elf.srelplt == NULL)
3310 abort ();
3311
3312 /* Calc. index no.
3313 Current offset - size first entry / entry size. */
3314 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3315
3316 /* The slots in the .got.plt correspond to the PLT slots in
3317 the same order. */
3318 gotplt_offset = plt_index * GOT_ENTRY_SIZE;
3319
3320 /* If .got.plt comes first it needs to contain the 3 header
3321 entries. */
3322 if (!s390_gotplt_after_got_p (info))
3323 gotplt_offset += 3 * GOT_ENTRY_SIZE;
3324
3325 /* Fill in the blueprint of a PLT. */
3326 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
3327 PLT_ENTRY_SIZE);
3328
3329 /* The first instruction in the PLT entry is a LARL loading
3330 the address of the GOT slot. We write the 4 byte
3331 immediate operand of the LARL instruction here. */
3332 bfd_put_32 (output_bfd,
3333 (htab->elf.sgotplt->output_section->vma +
3334 htab->elf.sgotplt->output_offset + gotplt_offset
3335 - (htab->elf.splt->output_section->vma +
3336 htab->elf.splt->output_offset +
3337 h->plt.offset))/2,
3338 htab->elf.splt->contents + h->plt.offset + 2);
3339 /* Fixup the relative branch to PLT 0 */
3340 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3341 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3342 htab->elf.splt->contents + h->plt.offset + 24);
3343 /* Fixup offset into .rela.plt section. */
3344 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3345 htab->elf.splt->contents + h->plt.offset + 28);
3346
3347 /* Fill in the entry in the global offset table.
3348 Points to instruction after GOT offset. */
3349 bfd_put_64 (output_bfd,
3350 (htab->elf.splt->output_section->vma
3351 + htab->elf.splt->output_offset
3352 + h->plt.offset
3353 + 14),
3354 htab->elf.sgotplt->contents + gotplt_offset);
3355
3356 /* Fill in the entry in the .rela.plt section. */
3357 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3358 + htab->elf.sgotplt->output_offset
3359 + gotplt_offset);
3360 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3361 rela.r_addend = 0;
3362 loc = htab->elf.srelplt->contents + plt_index *
3363 sizeof (Elf64_External_Rela);
3364 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3365
3366 if (!h->def_regular)
3367 {
3368 /* Mark the symbol as undefined, rather than as defined in
3369 the .plt section. Leave the value alone. This is a clue
3370 for the dynamic linker, to make function pointer
3371 comparisons work between an application and shared
3372 library. */
3373 sym->st_shndx = SHN_UNDEF;
3374 }
3375 }
3376 }
3377
3378 if (h->got.offset != (bfd_vma) -1
3379 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3380 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3381 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3382 {
3383 Elf_Internal_Rela rela;
3384 bfd_byte *loc;
3385
3386 /* This symbol has an entry in the global offset table. Set it
3387 up. */
3388 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3389 abort ();
3390
3391 rela.r_offset = (htab->elf.sgot->output_section->vma
3392 + htab->elf.sgot->output_offset
3393 + (h->got.offset &~ (bfd_vma) 1));
3394
3395 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3396 {
3397 if (bfd_link_pic (info))
3398 {
3399 /* An explicit GOT slot usage needs GLOB_DAT. If the
3400 symbol references local the implicit got.iplt slot
3401 will be used and the IRELATIVE reloc has been created
3402 above. */
3403 goto do_glob_dat;
3404 }
3405 else
3406 {
3407 /* For non-shared objects explicit GOT slots must be
3408 filled with the PLT slot address for pointer
3409 equality reasons. */
3410 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
3411 + htab->elf.iplt->output_offset
3412 + h->plt.offset),
3413 htab->elf.sgot->contents + h->got.offset);
3414 return true;
3415 }
3416 }
3417 else if (bfd_link_pic (info)
3418 && SYMBOL_REFERENCES_LOCAL (info, h))
3419 {
3420 if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
3421 return true;
3422
3423 /* If this is a static link, or it is a -Bsymbolic link and
3424 the symbol is defined locally or was forced to be local
3425 because of a version file, we just want to emit a
3426 RELATIVE reloc. The entry in the global offset table
3427 will already have been initialized in the
3428 relocate_section function. */
3429 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
3430 return false;
3431 BFD_ASSERT((h->got.offset & 1) != 0);
3432 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3433 rela.r_addend = (h->root.u.def.value
3434 + h->root.u.def.section->output_section->vma
3435 + h->root.u.def.section->output_offset);
3436 }
3437 else
3438 {
3439 BFD_ASSERT((h->got.offset & 1) == 0);
3440 do_glob_dat:
3441 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3442 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3443 rela.r_addend = 0;
3444 }
3445
3446 loc = htab->elf.srelgot->contents;
3447 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3448 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3449 }
3450
3451 if (h->needs_copy)
3452 {
3453 Elf_Internal_Rela rela;
3454 asection *s;
3455 bfd_byte *loc;
3456
3457 /* This symbols needs a copy reloc. Set it up. */
3458
3459 if (h->dynindx == -1
3460 || (h->root.type != bfd_link_hash_defined
3461 && h->root.type != bfd_link_hash_defweak)
3462 || htab->elf.srelbss == NULL)
3463 abort ();
3464
3465 rela.r_offset = (h->root.u.def.value
3466 + h->root.u.def.section->output_section->vma
3467 + h->root.u.def.section->output_offset);
3468 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3469 rela.r_addend = 0;
3470 if (h->root.u.def.section == htab->elf.sdynrelro)
3471 s = htab->elf.sreldynrelro;
3472 else
3473 s = htab->elf.srelbss;
3474 loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela);
3475 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3476 }
3477
3478 /* Mark some specially defined symbols as absolute. */
3479 if (h == htab->elf.hdynamic
3480 || h == htab->elf.hgot
3481 || h == htab->elf.hplt)
3482 sym->st_shndx = SHN_ABS;
3483
3484 return true;
3485 }
3486
3487 /* Used to decide how to sort relocs in an optimal manner for the
3488 dynamic linker, before writing them out. */
3489
3490 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)3491 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3492 const asection *rel_sec ATTRIBUTE_UNUSED,
3493 const Elf_Internal_Rela *rela)
3494 {
3495 bfd *abfd = info->output_bfd;
3496 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3497 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3498 unsigned long r_symndx = ELF64_R_SYM (rela->r_info);
3499 Elf_Internal_Sym sym;
3500
3501 if (htab->elf.dynsym == NULL
3502 || !bed->s->swap_symbol_in (abfd,
3503 (htab->elf.dynsym->contents
3504 + r_symndx * bed->s->sizeof_sym),
3505 0, &sym))
3506 abort ();
3507
3508 /* Check relocation against STT_GNU_IFUNC symbol. */
3509 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3510 return reloc_class_ifunc;
3511
3512 switch ((int) ELF64_R_TYPE (rela->r_info))
3513 {
3514 case R_390_RELATIVE:
3515 return reloc_class_relative;
3516 case R_390_JMP_SLOT:
3517 return reloc_class_plt;
3518 case R_390_COPY:
3519 return reloc_class_copy;
3520 default:
3521 return reloc_class_normal;
3522 }
3523 }
3524
3525 /* Finish up the dynamic sections. */
3526
3527 static bool
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3528 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3529 struct bfd_link_info *info)
3530 {
3531 struct elf_s390_link_hash_table *htab;
3532 bfd *dynobj;
3533 asection *sdyn;
3534 bfd *ibfd;
3535 unsigned int i;
3536
3537 htab = elf_s390_hash_table (info);
3538 if (htab == NULL)
3539 return false;
3540
3541 dynobj = htab->elf.dynobj;
3542 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3543
3544 if (htab->elf.dynamic_sections_created)
3545 {
3546 Elf64_External_Dyn *dyncon, *dynconend;
3547
3548 if (sdyn == NULL || htab->elf.sgot == NULL)
3549 abort ();
3550
3551 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3552 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3553 for (; dyncon < dynconend; dyncon++)
3554 {
3555 Elf_Internal_Dyn dyn;
3556 asection *s;
3557
3558 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3559
3560 switch (dyn.d_tag)
3561 {
3562 default:
3563 continue;
3564
3565 case DT_PLTGOT:
3566 /* DT_PLTGOT matches _GLOBAL_OFFSET_TABLE_ */
3567 dyn.d_un.d_ptr = s390_got_pointer (info);
3568 break;
3569
3570 case DT_JMPREL:
3571 s = htab->elf.srelplt;
3572 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3573 break;
3574
3575 case DT_PLTRELSZ:
3576 dyn.d_un.d_val = htab->elf.srelplt->size;
3577 if (htab->elf.irelplt)
3578 dyn.d_un.d_val += htab->elf.irelplt->size;
3579 break;
3580
3581 case DT_RELASZ:
3582 /* The procedure linkage table relocs (DT_JMPREL) should
3583 not be included in the overall relocs (DT_RELA).
3584 Therefore, we override the DT_RELASZ entry here to
3585 make it not include the JMPREL relocs. Since the
3586 linker script arranges for .rela.plt to follow all
3587 other relocation sections, we don't have to worry
3588 about changing the DT_RELA entry. */
3589 dyn.d_un.d_val -= htab->elf.srelplt->size;
3590 if (htab->elf.irelplt)
3591 dyn.d_un.d_val -= htab->elf.irelplt->size;
3592 break;
3593 }
3594
3595 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3596 }
3597
3598 /* Fill in the special first entry in the procedure linkage table. */
3599 if (htab->elf.splt && htab->elf.splt->size > 0)
3600 {
3601 /* fill in blueprint for plt 0 entry */
3602 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
3603 PLT_FIRST_ENTRY_SIZE);
3604 /* The second instruction in the first PLT entry is a LARL
3605 loading the GOT pointer. Fill in the LARL immediate
3606 address. */
3607 bfd_put_32 (output_bfd,
3608 (s390_got_pointer (info)
3609 - htab->elf.splt->output_section->vma
3610 - htab->elf.splt->output_offset - 6)/2,
3611 htab->elf.splt->contents + 8);
3612 }
3613 if (elf_section_data (htab->elf.splt->output_section) != NULL)
3614 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
3615 = PLT_ENTRY_SIZE;
3616 }
3617
3618 if (htab->elf.hgot && htab->elf.hgot->root.u.def.section)
3619 {
3620 /* Fill in the first three entries in the global offset table. */
3621 if (htab->elf.hgot->root.u.def.section->size > 0)
3622 {
3623 bfd_put_64 (output_bfd,
3624 (sdyn == NULL ? (bfd_vma) 0
3625 : sdyn->output_section->vma + sdyn->output_offset),
3626 htab->elf.hgot->root.u.def.section->contents);
3627 /* One entry for shared object struct ptr. */
3628 bfd_put_64 (output_bfd, (bfd_vma) 0,
3629 htab->elf.hgot->root.u.def.section->contents + 8);
3630 /* One entry for _dl_runtime_resolve. */
3631 bfd_put_64 (output_bfd, (bfd_vma) 0,
3632 htab->elf.hgot->root.u.def.section->contents + 16);
3633 }
3634 if (htab->elf.sgot != NULL && htab->elf.sgot->size > 0)
3635 elf_section_data (htab->elf.sgot->output_section)
3636 ->this_hdr.sh_entsize = 8;
3637 }
3638
3639 /* Finish dynamic symbol for local IFUNC symbols. */
3640 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3641 {
3642 struct plt_entry *local_plt;
3643 Elf_Internal_Sym *isym;
3644 Elf_Internal_Shdr *symtab_hdr;
3645
3646 symtab_hdr = &elf_symtab_hdr (ibfd);
3647
3648 if (!is_s390_elf (ibfd))
3649 continue;
3650
3651 local_plt = elf_s390_local_plt (ibfd);
3652 if (local_plt != NULL)
3653 for (i = 0; i < symtab_hdr->sh_info; i++)
3654 {
3655 if (local_plt[i].plt.offset != (bfd_vma) -1)
3656 {
3657 asection *sec = local_plt[i].sec;
3658 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i);
3659 if (isym == NULL)
3660 return false;
3661
3662 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3663 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3664 local_plt[i].plt.offset,
3665 isym->st_value
3666 + sec->output_section->vma
3667 + sec->output_offset);
3668
3669 }
3670 }
3671 }
3672
3673 return true;
3674 }
3675
3676 /* Support for core dump NOTE sections. */
3677
3678 static bool
elf_s390_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)3679 elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3680 {
3681 int offset;
3682 size_t size;
3683
3684 switch (note->descsz)
3685 {
3686 default:
3687 return false;
3688
3689 case 336: /* sizeof(struct elf_prstatus) on s390x */
3690 /* pr_cursig */
3691 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3692
3693 /* pr_pid */
3694 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);
3695
3696 /* pr_reg */
3697 offset = 112;
3698 size = 216;
3699 break;
3700 }
3701
3702 /* Make a ".reg/999" section. */
3703 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3704 size, note->descpos + offset);
3705 }
3706
3707 static bool
elf_s390_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)3708 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3709 {
3710 switch (note->descsz)
3711 {
3712 default:
3713 return false;
3714
3715 case 136: /* sizeof(struct elf_prpsinfo) on s390x */
3716 elf_tdata (abfd)->core->pid
3717 = bfd_get_32 (abfd, note->descdata + 24);
3718 elf_tdata (abfd)->core->program
3719 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
3720 elf_tdata (abfd)->core->command
3721 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
3722 }
3723
3724 /* Note that for some reason, a spurious space is tacked
3725 onto the end of the args in some (at least one anyway)
3726 implementations, so strip it off if it exists. */
3727
3728 {
3729 char *command = elf_tdata (abfd)->core->command;
3730 int n = strlen (command);
3731
3732 if (0 < n && command[n - 1] == ' ')
3733 command[n - 1] = '\0';
3734 }
3735
3736 return true;
3737 }
3738
3739 static char *
elf_s390_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)3740 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3741 int note_type, ...)
3742 {
3743 va_list ap;
3744
3745 switch (note_type)
3746 {
3747 default:
3748 return NULL;
3749
3750 case NT_PRPSINFO:
3751 {
3752 char data[136] ATTRIBUTE_NONSTRING = { 0 };
3753 const char *fname, *psargs;
3754
3755 va_start (ap, note_type);
3756 fname = va_arg (ap, const char *);
3757 psargs = va_arg (ap, const char *);
3758 va_end (ap);
3759
3760 strncpy (data + 40, fname, 16);
3761 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3762 DIAGNOSTIC_PUSH;
3763 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
3764 -Wstringop-truncation:
3765 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
3766 */
3767 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
3768 #endif
3769 strncpy (data + 56, psargs, 80);
3770 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3771 DIAGNOSTIC_POP;
3772 #endif
3773 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3774 &data, sizeof (data));
3775 }
3776
3777 case NT_PRSTATUS:
3778 {
3779 char data[336] = { 0 };
3780 long pid;
3781 int cursig;
3782 const void *gregs;
3783
3784 va_start (ap, note_type);
3785 pid = va_arg (ap, long);
3786 cursig = va_arg (ap, int);
3787 gregs = va_arg (ap, const void *);
3788 va_end (ap);
3789
3790 bfd_put_16 (abfd, cursig, data + 12);
3791 bfd_put_32 (abfd, pid, data + 32);
3792 memcpy (data + 112, gregs, 216);
3793 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3794 &data, sizeof (data));
3795 }
3796 }
3797 /* NOTREACHED */
3798 }
3799
3800 /* Return address for Ith PLT stub in section PLT, for relocation REL
3801 or (bfd_vma) -1 if it should not be included. */
3802
3803 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3804 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3805 const arelent *rel ATTRIBUTE_UNUSED)
3806 {
3807 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3808 }
3809
3810 /* Merge backend specific data from an object file to the output
3811 object file when linking. */
3812
3813 static bool
elf64_s390_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)3814 elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3815 {
3816 if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd))
3817 return true;
3818
3819 return elf_s390_merge_obj_attributes (ibfd, info);
3820 }
3821
3822 /* We may add a PT_S390_PGSTE program header. */
3823
3824 static int
elf_s390_additional_program_headers(bfd * abfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)3825 elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED,
3826 struct bfd_link_info *info)
3827 {
3828 struct elf_s390_link_hash_table *htab;
3829
3830 if (info)
3831 {
3832 htab = elf_s390_hash_table (info);
3833 if (htab)
3834 return htab->params->pgste;
3835 }
3836 return 0;
3837 }
3838
3839
3840 /* Add the PT_S390_PGSTE program header. */
3841
3842 static bool
elf_s390_modify_segment_map(bfd * abfd,struct bfd_link_info * info)3843 elf_s390_modify_segment_map (bfd *abfd, struct bfd_link_info *info)
3844 {
3845 struct elf_s390_link_hash_table *htab;
3846 struct elf_segment_map *m, *pm = NULL;
3847
3848 if (!abfd || !info)
3849 return true;
3850
3851 htab = elf_s390_hash_table (info);
3852 if (!htab || !htab->params->pgste)
3853 return true;
3854
3855 /* If there is already a PT_S390_PGSTE header, avoid adding
3856 another. */
3857 m = elf_seg_map (abfd);
3858 while (m && m->p_type != PT_S390_PGSTE)
3859 {
3860 pm = m;
3861 m = m->next;
3862 }
3863
3864 if (m)
3865 return true;
3866
3867 m = (struct elf_segment_map *)
3868 bfd_zalloc (abfd, sizeof (struct elf_segment_map));
3869 if (m == NULL)
3870 return false;
3871 m->p_type = PT_S390_PGSTE;
3872 m->count = 0;
3873 m->next = NULL;
3874 if (pm)
3875 pm->next = m;
3876
3877 return true;
3878 }
3879
3880 bool
bfd_elf_s390_set_options(struct bfd_link_info * info,struct s390_elf_params * params)3881 bfd_elf_s390_set_options (struct bfd_link_info *info,
3882 struct s390_elf_params *params)
3883 {
3884 struct elf_s390_link_hash_table *htab;
3885
3886 if (info)
3887 {
3888 htab = elf_s390_hash_table (info);
3889 if (htab)
3890 htab->params = params;
3891 }
3892
3893 return true;
3894 }
3895
3896
3897 /* Why was the hash table entry size definition changed from
3898 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3899 this is the only reason for the s390_elf64_size_info structure. */
3900
3901 const struct elf_size_info s390_elf64_size_info =
3902 {
3903 sizeof (Elf64_External_Ehdr),
3904 sizeof (Elf64_External_Phdr),
3905 sizeof (Elf64_External_Shdr),
3906 sizeof (Elf64_External_Rel),
3907 sizeof (Elf64_External_Rela),
3908 sizeof (Elf64_External_Sym),
3909 sizeof (Elf64_External_Dyn),
3910 sizeof (Elf_External_Note),
3911 8, /* hash-table entry size. */
3912 1, /* internal relocations per external relocations. */
3913 64, /* arch_size. */
3914 3, /* log_file_align. */
3915 ELFCLASS64, EV_CURRENT,
3916 bfd_elf64_write_out_phdrs,
3917 bfd_elf64_write_shdrs_and_ehdr,
3918 bfd_elf64_checksum_contents,
3919 bfd_elf64_write_relocs,
3920 bfd_elf64_swap_symbol_in,
3921 bfd_elf64_swap_symbol_out,
3922 bfd_elf64_slurp_reloc_table,
3923 bfd_elf64_slurp_symbol_table,
3924 bfd_elf64_swap_dyn_in,
3925 bfd_elf64_swap_dyn_out,
3926 bfd_elf64_swap_reloc_in,
3927 bfd_elf64_swap_reloc_out,
3928 bfd_elf64_swap_reloca_in,
3929 bfd_elf64_swap_reloca_out
3930 };
3931
3932 #define TARGET_BIG_SYM s390_elf64_vec
3933 #define TARGET_BIG_NAME "elf64-s390"
3934 #define ELF_ARCH bfd_arch_s390
3935 #define ELF_TARGET_ID S390_ELF_DATA
3936 #define ELF_MACHINE_CODE EM_S390
3937 #define ELF_MACHINE_ALT1 EM_S390_OLD
3938 #define ELF_MAXPAGESIZE 0x1000
3939
3940 #define elf_backend_size_info s390_elf64_size_info
3941
3942 #define elf_backend_can_gc_sections 1
3943 #define elf_backend_can_refcount 1
3944 #define elf_backend_want_got_plt 1
3945 #define elf_backend_plt_readonly 1
3946 #define elf_backend_want_plt_sym 0
3947 #define elf_backend_got_header_size 24
3948 #define elf_backend_want_dynrelro 1
3949 #define elf_backend_rela_normal 1
3950
3951 #define elf_info_to_howto elf_s390_info_to_howto
3952
3953 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3954 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3955 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3956 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3957 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data
3958
3959 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3960 #define elf_backend_check_relocs elf_s390_check_relocs
3961 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3962 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3963 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3964 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3965 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3966 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3967 #define elf_backend_relocate_section elf_s390_relocate_section
3968 #define elf_backend_late_size_sections elf_s390_late_size_sections
3969 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3970 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3971 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
3972 #define elf_backend_write_core_note elf_s390_write_core_note
3973 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3974 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
3975 #define elf_backend_additional_program_headers elf_s390_additional_program_headers
3976 #define elf_backend_modify_segment_map elf_s390_modify_segment_map
3977
3978 #define bfd_elf64_mkobject elf_s390_mkobject
3979 #define elf_backend_object_p elf_s390_object_p
3980
3981 #include "elf64-target.h"
3982