1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright (C) 2000-2016 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
29 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
30 from smaller values. Start with zero, widen, *then* decrement. */
31 #define MINUS_ONE (((bfd_vma)0) - 1)
32
33 static bfd_reloc_status_type
34 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
35 asection *, bfd *, char **);
36 static bfd_reloc_status_type
37 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
38 asection *, bfd *, char **);
39
40 /* The relocation "howto" table. */
41 static reloc_howto_type elf_howto_table[] =
42 {
43 HOWTO (R_390_NONE, /* type */
44 0, /* rightshift */
45 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
46 0, /* bitsize */
47 FALSE, /* pc_relative */
48 0, /* bitpos */
49 complain_overflow_dont, /* complain_on_overflow */
50 bfd_elf_generic_reloc, /* special_function */
51 "R_390_NONE", /* name */
52 FALSE, /* partial_inplace */
53 0, /* src_mask */
54 0, /* dst_mask */
55 FALSE), /* pcrel_offset */
56
57 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
59 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
60 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
61 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
63 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
65 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
67 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
69 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
71 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
73 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
75 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
77 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
79 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
81 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
83 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
85 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
87 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
89 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
91 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
93 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
95 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
97 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
99 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
101 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
103 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
105 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
107 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
109 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
111 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
113 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
114 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
115 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
117 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
119 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
121 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
123 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
125 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
127 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
129 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
130 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
131 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
132 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
133 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
134 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
135 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
136 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
138 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
139 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
140 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
141 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
143 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
144 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
146 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
147 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
149 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
151 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
152 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
154 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
155 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
156 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
157 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
158 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
159 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
160 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
161 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
163 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
164 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
165 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
166 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
167 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
168 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
169 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
170 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
171 HOWTO(R_390_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
172 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, MINUS_ONE, FALSE),
173 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE),
175 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE),
177 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE),
179 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
180 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE),
181 };
182
183 /* GNU extension to record C++ vtable hierarchy. */
184 static reloc_howto_type elf64_s390_vtinherit_howto =
185 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
186 static reloc_howto_type elf64_s390_vtentry_howto =
187 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
188
189 static reloc_howto_type *
elf_s390_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)190 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
191 bfd_reloc_code_real_type code)
192 {
193 switch (code)
194 {
195 case BFD_RELOC_NONE:
196 return &elf_howto_table[(int) R_390_NONE];
197 case BFD_RELOC_8:
198 return &elf_howto_table[(int) R_390_8];
199 case BFD_RELOC_390_12:
200 return &elf_howto_table[(int) R_390_12];
201 case BFD_RELOC_16:
202 return &elf_howto_table[(int) R_390_16];
203 case BFD_RELOC_32:
204 return &elf_howto_table[(int) R_390_32];
205 case BFD_RELOC_CTOR:
206 return &elf_howto_table[(int) R_390_32];
207 case BFD_RELOC_32_PCREL:
208 return &elf_howto_table[(int) R_390_PC32];
209 case BFD_RELOC_390_GOT12:
210 return &elf_howto_table[(int) R_390_GOT12];
211 case BFD_RELOC_32_GOT_PCREL:
212 return &elf_howto_table[(int) R_390_GOT32];
213 case BFD_RELOC_390_PLT32:
214 return &elf_howto_table[(int) R_390_PLT32];
215 case BFD_RELOC_390_COPY:
216 return &elf_howto_table[(int) R_390_COPY];
217 case BFD_RELOC_390_GLOB_DAT:
218 return &elf_howto_table[(int) R_390_GLOB_DAT];
219 case BFD_RELOC_390_JMP_SLOT:
220 return &elf_howto_table[(int) R_390_JMP_SLOT];
221 case BFD_RELOC_390_RELATIVE:
222 return &elf_howto_table[(int) R_390_RELATIVE];
223 case BFD_RELOC_32_GOTOFF:
224 return &elf_howto_table[(int) R_390_GOTOFF32];
225 case BFD_RELOC_390_GOTPC:
226 return &elf_howto_table[(int) R_390_GOTPC];
227 case BFD_RELOC_390_GOT16:
228 return &elf_howto_table[(int) R_390_GOT16];
229 case BFD_RELOC_16_PCREL:
230 return &elf_howto_table[(int) R_390_PC16];
231 case BFD_RELOC_390_PC12DBL:
232 return &elf_howto_table[(int) R_390_PC12DBL];
233 case BFD_RELOC_390_PLT12DBL:
234 return &elf_howto_table[(int) R_390_PLT12DBL];
235 case BFD_RELOC_390_PC16DBL:
236 return &elf_howto_table[(int) R_390_PC16DBL];
237 case BFD_RELOC_390_PLT16DBL:
238 return &elf_howto_table[(int) R_390_PLT16DBL];
239 case BFD_RELOC_390_PC24DBL:
240 return &elf_howto_table[(int) R_390_PC24DBL];
241 case BFD_RELOC_390_PLT24DBL:
242 return &elf_howto_table[(int) R_390_PLT24DBL];
243 case BFD_RELOC_390_PC32DBL:
244 return &elf_howto_table[(int) R_390_PC32DBL];
245 case BFD_RELOC_390_PLT32DBL:
246 return &elf_howto_table[(int) R_390_PLT32DBL];
247 case BFD_RELOC_390_GOTPCDBL:
248 return &elf_howto_table[(int) R_390_GOTPCDBL];
249 case BFD_RELOC_64:
250 return &elf_howto_table[(int) R_390_64];
251 case BFD_RELOC_64_PCREL:
252 return &elf_howto_table[(int) R_390_PC64];
253 case BFD_RELOC_390_GOT64:
254 return &elf_howto_table[(int) R_390_GOT64];
255 case BFD_RELOC_390_PLT64:
256 return &elf_howto_table[(int) R_390_PLT64];
257 case BFD_RELOC_390_GOTENT:
258 return &elf_howto_table[(int) R_390_GOTENT];
259 case BFD_RELOC_16_GOTOFF:
260 return &elf_howto_table[(int) R_390_GOTOFF16];
261 case BFD_RELOC_390_GOTOFF64:
262 return &elf_howto_table[(int) R_390_GOTOFF64];
263 case BFD_RELOC_390_GOTPLT12:
264 return &elf_howto_table[(int) R_390_GOTPLT12];
265 case BFD_RELOC_390_GOTPLT16:
266 return &elf_howto_table[(int) R_390_GOTPLT16];
267 case BFD_RELOC_390_GOTPLT32:
268 return &elf_howto_table[(int) R_390_GOTPLT32];
269 case BFD_RELOC_390_GOTPLT64:
270 return &elf_howto_table[(int) R_390_GOTPLT64];
271 case BFD_RELOC_390_GOTPLTENT:
272 return &elf_howto_table[(int) R_390_GOTPLTENT];
273 case BFD_RELOC_390_PLTOFF16:
274 return &elf_howto_table[(int) R_390_PLTOFF16];
275 case BFD_RELOC_390_PLTOFF32:
276 return &elf_howto_table[(int) R_390_PLTOFF32];
277 case BFD_RELOC_390_PLTOFF64:
278 return &elf_howto_table[(int) R_390_PLTOFF64];
279 case BFD_RELOC_390_TLS_LOAD:
280 return &elf_howto_table[(int) R_390_TLS_LOAD];
281 case BFD_RELOC_390_TLS_GDCALL:
282 return &elf_howto_table[(int) R_390_TLS_GDCALL];
283 case BFD_RELOC_390_TLS_LDCALL:
284 return &elf_howto_table[(int) R_390_TLS_LDCALL];
285 case BFD_RELOC_390_TLS_GD64:
286 return &elf_howto_table[(int) R_390_TLS_GD64];
287 case BFD_RELOC_390_TLS_GOTIE12:
288 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
289 case BFD_RELOC_390_TLS_GOTIE64:
290 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
291 case BFD_RELOC_390_TLS_LDM64:
292 return &elf_howto_table[(int) R_390_TLS_LDM64];
293 case BFD_RELOC_390_TLS_IE64:
294 return &elf_howto_table[(int) R_390_TLS_IE64];
295 case BFD_RELOC_390_TLS_IEENT:
296 return &elf_howto_table[(int) R_390_TLS_IEENT];
297 case BFD_RELOC_390_TLS_LE64:
298 return &elf_howto_table[(int) R_390_TLS_LE64];
299 case BFD_RELOC_390_TLS_LDO64:
300 return &elf_howto_table[(int) R_390_TLS_LDO64];
301 case BFD_RELOC_390_TLS_DTPMOD:
302 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
303 case BFD_RELOC_390_TLS_DTPOFF:
304 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
305 case BFD_RELOC_390_TLS_TPOFF:
306 return &elf_howto_table[(int) R_390_TLS_TPOFF];
307 case BFD_RELOC_390_20:
308 return &elf_howto_table[(int) R_390_20];
309 case BFD_RELOC_390_GOT20:
310 return &elf_howto_table[(int) R_390_GOT20];
311 case BFD_RELOC_390_GOTPLT20:
312 return &elf_howto_table[(int) R_390_GOTPLT20];
313 case BFD_RELOC_390_TLS_GOTIE20:
314 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
315 case BFD_RELOC_390_IRELATIVE:
316 return &elf_howto_table[(int) R_390_IRELATIVE];
317 case BFD_RELOC_VTABLE_INHERIT:
318 return &elf64_s390_vtinherit_howto;
319 case BFD_RELOC_VTABLE_ENTRY:
320 return &elf64_s390_vtentry_howto;
321 default:
322 break;
323 }
324 return 0;
325 }
326
327 static reloc_howto_type *
elf_s390_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)328 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
329 const char *r_name)
330 {
331 unsigned int i;
332
333 for (i = 0;
334 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
335 i++)
336 if (elf_howto_table[i].name != NULL
337 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
338 return &elf_howto_table[i];
339
340 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
341 return &elf64_s390_vtinherit_howto;
342 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
343 return &elf64_s390_vtentry_howto;
344
345 return NULL;
346 }
347
348 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
349 and elf64-s390.c has its own copy. */
350
351 static void
elf_s390_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)352 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
353 arelent *cache_ptr,
354 Elf_Internal_Rela *dst)
355 {
356 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
357 switch (r_type)
358 {
359 case R_390_GNU_VTINHERIT:
360 cache_ptr->howto = &elf64_s390_vtinherit_howto;
361 break;
362
363 case R_390_GNU_VTENTRY:
364 cache_ptr->howto = &elf64_s390_vtentry_howto;
365 break;
366
367 default:
368 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
369 {
370 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
371 abfd, (int) r_type);
372 r_type = R_390_NONE;
373 }
374 cache_ptr->howto = &elf_howto_table[r_type];
375 }
376 }
377
378 /* A relocation function which doesn't do anything. */
379 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)380 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
381 arelent *reloc_entry,
382 asymbol *symbol ATTRIBUTE_UNUSED,
383 void * data ATTRIBUTE_UNUSED,
384 asection *input_section,
385 bfd *output_bfd,
386 char **error_message ATTRIBUTE_UNUSED)
387 {
388 if (output_bfd)
389 reloc_entry->address += input_section->output_offset;
390 return bfd_reloc_ok;
391 }
392
393 /* Handle the large displacement relocs. */
394 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)395 s390_elf_ldisp_reloc (bfd *abfd,
396 arelent *reloc_entry,
397 asymbol *symbol,
398 void * data,
399 asection *input_section,
400 bfd *output_bfd,
401 char **error_message ATTRIBUTE_UNUSED)
402 {
403 reloc_howto_type *howto = reloc_entry->howto;
404 bfd_vma relocation;
405 bfd_vma insn;
406
407 if (output_bfd != (bfd *) NULL
408 && (symbol->flags & BSF_SECTION_SYM) == 0
409 && (! howto->partial_inplace
410 || reloc_entry->addend == 0))
411 {
412 reloc_entry->address += input_section->output_offset;
413 return bfd_reloc_ok;
414 }
415 if (output_bfd != NULL)
416 return bfd_reloc_continue;
417
418 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
419 return bfd_reloc_outofrange;
420
421 relocation = (symbol->value
422 + symbol->section->output_section->vma
423 + symbol->section->output_offset);
424 relocation += reloc_entry->addend;
425 if (howto->pc_relative)
426 {
427 relocation -= (input_section->output_section->vma
428 + input_section->output_offset);
429 relocation -= reloc_entry->address;
430 }
431
432 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
433 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
434 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
435
436 if ((bfd_signed_vma) relocation < - 0x80000
437 || (bfd_signed_vma) relocation > 0x7ffff)
438 return bfd_reloc_overflow;
439 else
440 return bfd_reloc_ok;
441 }
442
443 static bfd_boolean
elf_s390_is_local_label_name(bfd * abfd,const char * name)444 elf_s390_is_local_label_name (bfd *abfd, const char *name)
445 {
446 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
447 return TRUE;
448
449 return _bfd_elf_is_local_label_name (abfd, name);
450 }
451
452 /* Functions for the 390 ELF linker. */
453
454 /* The name of the dynamic interpreter. This is put in the .interp
455 section. */
456
457 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
458
459 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
460 copying dynamic variables from a shared lib into an app's dynbss
461 section, and instead use a dynamic relocation to point into the
462 shared lib. */
463 #define ELIMINATE_COPY_RELOCS 1
464
465 /* The size in bytes of the first entry in the procedure linkage table. */
466 #define PLT_FIRST_ENTRY_SIZE 32
467 /* The size in bytes of an entry in the procedure linkage table. */
468 #define PLT_ENTRY_SIZE 32
469
470 #define GOT_ENTRY_SIZE 8
471
472 #define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela)
473
474 /* The first three entries in a procedure linkage table are reserved,
475 and the initial contents are unimportant (we zero them out).
476 Subsequent entries look like this. See the SVR4 ABI 386
477 supplement to see how this works. */
478
479 /* For the s390, simple addr offset can only be 0 - 4096.
480 To use the full 16777216 TB address space, several instructions
481 are needed to load an address in a register and execute
482 a branch( or just saving the address)
483
484 Furthermore, only r 0 and 1 are free to use!!! */
485
486 /* The first 3 words in the GOT are then reserved.
487 Word 0 is the address of the dynamic table.
488 Word 1 is a pointer to a structure describing the object
489 Word 2 is used to point to the loader entry address.
490
491 The code for PLT entries looks like this:
492
493 The GOT holds the address in the PLT to be executed.
494 The loader then gets:
495 48(15) = Pointer to the structure describing the object.
496 56(15) = Offset in symbol table
497 The loader must then find the module where the function is
498 and insert the address in the GOT.
499
500 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
501 LG 1,0(1) # 6 bytes Load address from GOT in r1
502 BCR 15,1 # 2 bytes Jump to address
503 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
504 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
505 BRCL 15,-x # 6 bytes Jump to start of PLT
506 .long ? # 4 bytes offset into .rela.plt
507
508 Total = 32 bytes per PLT entry
509 Fixup at offset 2: relative address to GOT entry
510 Fixup at offset 22: relative branch to PLT0
511 Fixup at offset 28: 32 bit offset into .rela.plt
512
513 A 32 bit offset into the symbol table is enough. It allows for
514 .rela.plt sections up to a size of 2 gigabyte. A single dynamic
515 object (the main program, any shared library) is limited to 4GB in
516 size. Having a .rela.plt of 2GB would already make the .plt
517 section bigger than 8GB. */
518
519 static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] =
520 {
521 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
522 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, /* lg %r1,0(%r1) */
523 0x07, 0xf1, /* br %r1 */
524 0x0d, 0x10, /* basr %r1,%r0 */
525 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, /* lgf %r1,12(%r1) */
526 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, /* jg first plt */
527 0x00, 0x00, 0x00, 0x00 /* .long 0x00000000 */
528 };
529
530 /* The first PLT entry pushes the offset into the symbol table
531 from R1 onto the stack at 56(15) and the loader object info
532 at 48(15), loads the loader address in R1 and jumps to it. */
533
534 /* The first entry in the PLT:
535
536 PLT0:
537 STG 1,56(15) # r1 contains the offset into the symbol table
538 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
539 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
540 LG 1,16(1) # get entry address of loader
541 BCR 15,1 # jump to loader
542
543 Fixup at offset 8: relative address to start of GOT. */
544
545 static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] =
546 {
547 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, /* stg %r1,56(%r15) */
548 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
549 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, /* mvc 48(8,%r15),8(%r1) */
550 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, /* lg %r1,16(%r1) */
551 0x07, 0xf1, /* br %r1 */
552 0x07, 0x00, /* nopr %r0 */
553 0x07, 0x00, /* nopr %r0 */
554 0x07, 0x00 /* nopr %r0 */
555 };
556
557
558 /* s390 ELF linker hash entry. */
559
560 struct elf_s390_link_hash_entry
561 {
562 struct elf_link_hash_entry elf;
563
564 /* Track dynamic relocs copied for this symbol. */
565 struct elf_dyn_relocs *dyn_relocs;
566
567 /* Number of GOTPLT references for a function. */
568 bfd_signed_vma gotplt_refcount;
569
570 #define GOT_UNKNOWN 0
571 #define GOT_NORMAL 1
572 #define GOT_TLS_GD 2
573 #define GOT_TLS_IE 3
574 #define GOT_TLS_IE_NLT 3
575 unsigned char tls_type;
576
577 /* For pointer equality reasons we might need to change the symbol
578 type from STT_GNU_IFUNC to STT_FUNC together with its value and
579 section entry. So after alloc_dynrelocs only these values should
580 be used. In order to check whether a symbol is IFUNC use
581 s390_is_ifunc_symbol_p. */
582 bfd_vma ifunc_resolver_address;
583 asection *ifunc_resolver_section;
584 };
585
586 #define elf_s390_hash_entry(ent) \
587 ((struct elf_s390_link_hash_entry *)(ent))
588
589 /* This structure represents an entry in the local PLT list needed for
590 local IFUNC symbols. */
591 struct plt_entry
592 {
593 /* The section of the local symbol.
594 Set in relocate_section and used in finish_dynamic_sections. */
595 asection *sec;
596
597 union
598 {
599 bfd_signed_vma refcount;
600 bfd_vma offset;
601 } plt;
602 };
603
604 /* NOTE: Keep this structure in sync with
605 the one declared in elf32-s390.c. */
606 struct elf_s390_obj_tdata
607 {
608 struct elf_obj_tdata root;
609
610 /* A local PLT is needed for ifunc symbols. */
611 struct plt_entry *local_plt;
612
613 /* TLS type for each local got entry. */
614 char *local_got_tls_type;
615 };
616
617 #define elf_s390_tdata(abfd) \
618 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
619
620 #define elf_s390_local_plt(abfd) \
621 (elf_s390_tdata (abfd)->local_plt)
622
623 #define elf_s390_local_got_tls_type(abfd) \
624 (elf_s390_tdata (abfd)->local_got_tls_type)
625
626 #define is_s390_elf(bfd) \
627 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
628 && elf_tdata (bfd) != NULL \
629 && elf_object_id (bfd) == S390_ELF_DATA)
630
631 static bfd_boolean
elf_s390_mkobject(bfd * abfd)632 elf_s390_mkobject (bfd *abfd)
633 {
634 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
635 S390_ELF_DATA);
636 }
637
638 static bfd_boolean
elf_s390_object_p(bfd * abfd)639 elf_s390_object_p (bfd *abfd)
640 {
641 /* Set the right machine number for an s390 elf32 file. */
642 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
643 }
644
645 /* s390 ELF linker hash table. */
646
647 struct elf_s390_link_hash_table
648 {
649 struct elf_link_hash_table elf;
650
651 /* Short-cuts to get to dynamic linker sections. */
652 asection *sdynbss;
653 asection *srelbss;
654 asection *irelifunc;
655
656 union {
657 bfd_signed_vma refcount;
658 bfd_vma offset;
659 } tls_ldm_got;
660
661 /* Small local sym cache. */
662 struct sym_cache sym_cache;
663 };
664
665 /* Get the s390 ELF linker hash table from a link_info structure. */
666
667 #define elf_s390_hash_table(p) \
668 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
669 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
670
671 #define ELF64 1
672 #include "elf-s390-common.c"
673
674 /* Create an entry in an s390 ELF linker hash table. */
675
676 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)677 link_hash_newfunc (struct bfd_hash_entry *entry,
678 struct bfd_hash_table *table,
679 const char *string)
680 {
681 /* Allocate the structure if it has not already been allocated by a
682 subclass. */
683 if (entry == NULL)
684 {
685 entry = bfd_hash_allocate (table,
686 sizeof (struct elf_s390_link_hash_entry));
687 if (entry == NULL)
688 return entry;
689 }
690
691 /* Call the allocation method of the superclass. */
692 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
693 if (entry != NULL)
694 {
695 struct elf_s390_link_hash_entry *eh;
696
697 eh = (struct elf_s390_link_hash_entry *) entry;
698 eh->dyn_relocs = NULL;
699 eh->gotplt_refcount = 0;
700 eh->tls_type = GOT_UNKNOWN;
701 eh->ifunc_resolver_address = 0;
702 eh->ifunc_resolver_section = NULL;
703 }
704
705 return entry;
706 }
707
708 /* Create an s390 ELF linker hash table. */
709
710 static struct bfd_link_hash_table *
elf_s390_link_hash_table_create(bfd * abfd)711 elf_s390_link_hash_table_create (bfd *abfd)
712 {
713 struct elf_s390_link_hash_table *ret;
714 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
715
716 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
717 if (ret == NULL)
718 return NULL;
719
720 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
721 sizeof (struct elf_s390_link_hash_entry),
722 S390_ELF_DATA))
723 {
724 free (ret);
725 return NULL;
726 }
727
728 return &ret->elf.root;
729 }
730
731 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
732 shortcuts to them in our hash table. */
733
734 static bfd_boolean
create_got_section(bfd * dynobj,struct bfd_link_info * info)735 create_got_section (bfd *dynobj,
736 struct bfd_link_info *info)
737 {
738 struct elf_s390_link_hash_table *htab;
739
740 if (! _bfd_elf_create_got_section (dynobj, info))
741 return FALSE;
742
743 htab = elf_s390_hash_table (info);
744 if (htab == NULL)
745 return FALSE;
746
747 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
748 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
749 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
750 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
751 abort ();
752 return TRUE;
753 }
754
755 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
756 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
757 hash table. */
758
759 static bfd_boolean
elf_s390_create_dynamic_sections(bfd * dynobj,struct bfd_link_info * info)760 elf_s390_create_dynamic_sections (bfd *dynobj,
761 struct bfd_link_info *info)
762 {
763 struct elf_s390_link_hash_table *htab;
764
765 htab = elf_s390_hash_table (info);
766 if (htab == NULL)
767 return FALSE;
768
769 if (!htab->elf.sgot && !create_got_section (dynobj, info))
770 return FALSE;
771
772 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
773 return FALSE;
774
775 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
776 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
777 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
778 if (!bfd_link_pic (info))
779 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
780
781 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
782 || (!bfd_link_pic (info) && !htab->srelbss))
783 abort ();
784
785 return TRUE;
786 }
787
788 /* Copy the extra info we tack onto an elf_link_hash_entry. */
789
790 static void
elf_s390_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)791 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
792 struct elf_link_hash_entry *dir,
793 struct elf_link_hash_entry *ind)
794 {
795 struct elf_s390_link_hash_entry *edir, *eind;
796
797 edir = (struct elf_s390_link_hash_entry *) dir;
798 eind = (struct elf_s390_link_hash_entry *) ind;
799
800 if (eind->dyn_relocs != NULL)
801 {
802 if (edir->dyn_relocs != NULL)
803 {
804 struct elf_dyn_relocs **pp;
805 struct elf_dyn_relocs *p;
806
807 /* Add reloc counts against the indirect sym to the direct sym
808 list. Merge any entries against the same section. */
809 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
810 {
811 struct elf_dyn_relocs *q;
812
813 for (q = edir->dyn_relocs; q != NULL; q = q->next)
814 if (q->sec == p->sec)
815 {
816 q->pc_count += p->pc_count;
817 q->count += p->count;
818 *pp = p->next;
819 break;
820 }
821 if (q == NULL)
822 pp = &p->next;
823 }
824 *pp = edir->dyn_relocs;
825 }
826
827 edir->dyn_relocs = eind->dyn_relocs;
828 eind->dyn_relocs = NULL;
829 }
830
831 if (ind->root.type == bfd_link_hash_indirect
832 && dir->got.refcount <= 0)
833 {
834 edir->tls_type = eind->tls_type;
835 eind->tls_type = GOT_UNKNOWN;
836 }
837
838 if (ELIMINATE_COPY_RELOCS
839 && ind->root.type != bfd_link_hash_indirect
840 && dir->dynamic_adjusted)
841 {
842 /* If called to transfer flags for a weakdef during processing
843 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
844 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
845 dir->ref_dynamic |= ind->ref_dynamic;
846 dir->ref_regular |= ind->ref_regular;
847 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
848 dir->needs_plt |= ind->needs_plt;
849 }
850 else
851 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
852 }
853
854 static int
elf_s390_tls_transition(struct bfd_link_info * info,int r_type,int is_local)855 elf_s390_tls_transition (struct bfd_link_info *info,
856 int r_type,
857 int is_local)
858 {
859 if (bfd_link_pic (info))
860 return r_type;
861
862 switch (r_type)
863 {
864 case R_390_TLS_GD64:
865 case R_390_TLS_IE64:
866 if (is_local)
867 return R_390_TLS_LE64;
868 return R_390_TLS_IE64;
869 case R_390_TLS_GOTIE64:
870 if (is_local)
871 return R_390_TLS_LE64;
872 return R_390_TLS_GOTIE64;
873 case R_390_TLS_LDM64:
874 return R_390_TLS_LE64;
875 }
876
877 return r_type;
878 }
879
880 /* Look through the relocs for a section during the first phase, and
881 allocate space in the global offset table or procedure linkage
882 table. */
883
884 static bfd_boolean
elf_s390_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)885 elf_s390_check_relocs (bfd *abfd,
886 struct bfd_link_info *info,
887 asection *sec,
888 const Elf_Internal_Rela *relocs)
889 {
890 struct elf_s390_link_hash_table *htab;
891 Elf_Internal_Shdr *symtab_hdr;
892 struct elf_link_hash_entry **sym_hashes;
893 const Elf_Internal_Rela *rel;
894 const Elf_Internal_Rela *rel_end;
895 asection *sreloc;
896 bfd_signed_vma *local_got_refcounts;
897 int tls_type, old_tls_type;
898
899 if (bfd_link_relocatable (info))
900 return TRUE;
901
902 BFD_ASSERT (is_s390_elf (abfd));
903
904 htab = elf_s390_hash_table (info);
905 if (htab == NULL)
906 return FALSE;
907
908 symtab_hdr = &elf_symtab_hdr (abfd);
909 sym_hashes = elf_sym_hashes (abfd);
910 local_got_refcounts = elf_local_got_refcounts (abfd);
911
912 sreloc = NULL;
913
914 rel_end = relocs + sec->reloc_count;
915 for (rel = relocs; rel < rel_end; rel++)
916 {
917 unsigned int r_type;
918 unsigned long r_symndx;
919 struct elf_link_hash_entry *h;
920 Elf_Internal_Sym *isym;
921
922 r_symndx = ELF64_R_SYM (rel->r_info);
923
924 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
925 {
926 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
927 abfd,
928 r_symndx);
929 return FALSE;
930 }
931
932 if (r_symndx < symtab_hdr->sh_info)
933 {
934 /* A local symbol. */
935 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
936 abfd, r_symndx);
937 if (isym == NULL)
938 return FALSE;
939
940 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
941 {
942 struct plt_entry *plt;
943
944 if (htab->elf.dynobj == NULL)
945 htab->elf.dynobj = abfd;
946
947 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
948 return FALSE;
949
950 if (local_got_refcounts == NULL)
951 {
952 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
953 return FALSE;
954 local_got_refcounts = elf_local_got_refcounts (abfd);
955 }
956 plt = elf_s390_local_plt (abfd);
957 plt[r_symndx].plt.refcount++;
958 }
959 h = NULL;
960 }
961 else
962 {
963 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
964 while (h->root.type == bfd_link_hash_indirect
965 || h->root.type == bfd_link_hash_warning)
966 h = (struct elf_link_hash_entry *) h->root.u.i.link;
967
968 /* PR15323, ref flags aren't set for references in the same
969 object. */
970 h->root.non_ir_ref = 1;
971 }
972
973 /* Create got section and local_got_refcounts array if they
974 are needed. */
975 r_type = elf_s390_tls_transition (info,
976 ELF64_R_TYPE (rel->r_info),
977 h == NULL);
978 switch (r_type)
979 {
980 case R_390_GOT12:
981 case R_390_GOT16:
982 case R_390_GOT20:
983 case R_390_GOT32:
984 case R_390_GOT64:
985 case R_390_GOTENT:
986 case R_390_GOTPLT12:
987 case R_390_GOTPLT16:
988 case R_390_GOTPLT20:
989 case R_390_GOTPLT32:
990 case R_390_GOTPLT64:
991 case R_390_GOTPLTENT:
992 case R_390_TLS_GD64:
993 case R_390_TLS_GOTIE12:
994 case R_390_TLS_GOTIE20:
995 case R_390_TLS_GOTIE64:
996 case R_390_TLS_IEENT:
997 case R_390_TLS_IE64:
998 case R_390_TLS_LDM64:
999 if (h == NULL
1000 && local_got_refcounts == NULL)
1001 {
1002 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1003 return FALSE;
1004 local_got_refcounts = elf_local_got_refcounts (abfd);
1005 }
1006
1007 /* Fall through. */
1008 case R_390_GOTOFF16:
1009 case R_390_GOTOFF32:
1010 case R_390_GOTOFF64:
1011 case R_390_GOTPC:
1012 case R_390_GOTPCDBL:
1013 if (htab->elf.sgot == NULL)
1014 {
1015 if (htab->elf.dynobj == NULL)
1016 htab->elf.dynobj = abfd;
1017 if (!create_got_section (htab->elf.dynobj, info))
1018 return FALSE;
1019 }
1020 }
1021
1022 if (h != NULL)
1023 {
1024 if (htab->elf.dynobj == NULL)
1025 htab->elf.dynobj = abfd;
1026 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1027 return FALSE;
1028
1029 /* Make sure an IFUNC symbol defined in a non-shared object
1030 always gets a PLT slot. */
1031 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1032 {
1033 /* The symbol is called by the dynamic loader in order
1034 to resolve the relocation. So it is in fact also
1035 referenced. */
1036 h->ref_regular = 1;
1037 h->needs_plt = 1;
1038 }
1039 }
1040
1041 switch (r_type)
1042 {
1043 case R_390_GOTPC:
1044 case R_390_GOTPCDBL:
1045 /* These relocs do not need a GOT slot. They just load the
1046 GOT pointer itself or address something else relative to
1047 the GOT. Since the GOT pointer has been set up above we
1048 are done. */
1049 break;
1050 case R_390_GOTOFF16:
1051 case R_390_GOTOFF32:
1052 case R_390_GOTOFF64:
1053 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
1054 break;
1055
1056 case R_390_PLT12DBL:
1057 case R_390_PLT16DBL:
1058 case R_390_PLT24DBL:
1059 case R_390_PLT32:
1060 case R_390_PLT32DBL:
1061 case R_390_PLT64:
1062 case R_390_PLTOFF16:
1063 case R_390_PLTOFF32:
1064 case R_390_PLTOFF64:
1065 /* This symbol requires a procedure linkage table entry. We
1066 actually build the entry in adjust_dynamic_symbol,
1067 because this might be a case of linking PIC code which is
1068 never referenced by a dynamic object, in which case we
1069 don't need to generate a procedure linkage table entry
1070 after all. */
1071
1072 /* If this is a local symbol, we resolve it directly without
1073 creating a procedure linkage table entry. */
1074 if (h != NULL)
1075 {
1076 h->needs_plt = 1;
1077 h->plt.refcount += 1;
1078 }
1079 break;
1080
1081 case R_390_GOTPLT12:
1082 case R_390_GOTPLT16:
1083 case R_390_GOTPLT20:
1084 case R_390_GOTPLT32:
1085 case R_390_GOTPLT64:
1086 case R_390_GOTPLTENT:
1087 /* This symbol requires either a procedure linkage table entry
1088 or an entry in the local got. We actually build the entry
1089 in adjust_dynamic_symbol because whether this is really a
1090 global reference can change and with it the fact if we have
1091 to create a plt entry or a local got entry. To be able to
1092 make a once global symbol a local one we have to keep track
1093 of the number of gotplt references that exist for this
1094 symbol. */
1095 if (h != NULL)
1096 {
1097 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1098 h->needs_plt = 1;
1099 h->plt.refcount += 1;
1100 }
1101 else
1102 local_got_refcounts[r_symndx] += 1;
1103 break;
1104
1105 case R_390_TLS_LDM64:
1106 htab->tls_ldm_got.refcount += 1;
1107 break;
1108
1109 case R_390_TLS_IE64:
1110 case R_390_TLS_GOTIE12:
1111 case R_390_TLS_GOTIE20:
1112 case R_390_TLS_GOTIE64:
1113 case R_390_TLS_IEENT:
1114 if (bfd_link_pic (info))
1115 info->flags |= DF_STATIC_TLS;
1116 /* Fall through */
1117
1118 case R_390_GOT12:
1119 case R_390_GOT16:
1120 case R_390_GOT20:
1121 case R_390_GOT32:
1122 case R_390_GOT64:
1123 case R_390_GOTENT:
1124 case R_390_TLS_GD64:
1125 /* This symbol requires a global offset table entry. */
1126 switch (r_type)
1127 {
1128 default:
1129 case R_390_GOT12:
1130 case R_390_GOT16:
1131 case R_390_GOT20:
1132 case R_390_GOT32:
1133 case R_390_GOTENT:
1134 tls_type = GOT_NORMAL;
1135 break;
1136 case R_390_TLS_GD64:
1137 tls_type = GOT_TLS_GD;
1138 break;
1139 case R_390_TLS_IE64:
1140 case R_390_TLS_GOTIE64:
1141 tls_type = GOT_TLS_IE;
1142 break;
1143 case R_390_TLS_GOTIE12:
1144 case R_390_TLS_GOTIE20:
1145 case R_390_TLS_IEENT:
1146 tls_type = GOT_TLS_IE_NLT;
1147 break;
1148 }
1149
1150 if (h != NULL)
1151 {
1152 h->got.refcount += 1;
1153 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1154 }
1155 else
1156 {
1157 local_got_refcounts[r_symndx] += 1;
1158 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1159 }
1160 /* If a TLS symbol is accessed using IE at least once,
1161 there is no point to use dynamic model for it. */
1162 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1163 {
1164 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1165 {
1166 (*_bfd_error_handler)
1167 (_("%B: `%s' accessed both as normal and thread local symbol"),
1168 abfd, h->root.root.string);
1169 return FALSE;
1170 }
1171 if (old_tls_type > tls_type)
1172 tls_type = old_tls_type;
1173 }
1174
1175 if (old_tls_type != tls_type)
1176 {
1177 if (h != NULL)
1178 elf_s390_hash_entry (h)->tls_type = tls_type;
1179 else
1180 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1181 }
1182
1183 if (r_type != R_390_TLS_IE64)
1184 break;
1185 /* Fall through */
1186
1187 case R_390_TLS_LE64:
1188 /* For static linking and executables this reloc will be
1189 calculated at linktime otherwise a TLS_TPOFF runtime
1190 reloc will be generated. */
1191 if (r_type == R_390_TLS_LE64 && bfd_link_pie (info))
1192 break;
1193
1194 if (!bfd_link_pic (info))
1195 break;
1196 info->flags |= DF_STATIC_TLS;
1197 /* Fall through */
1198
1199 case R_390_8:
1200 case R_390_16:
1201 case R_390_32:
1202 case R_390_64:
1203 case R_390_PC12DBL:
1204 case R_390_PC16:
1205 case R_390_PC16DBL:
1206 case R_390_PC24DBL:
1207 case R_390_PC32:
1208 case R_390_PC32DBL:
1209 case R_390_PC64:
1210 if (h != NULL && bfd_link_executable (info))
1211 {
1212 /* If this reloc is in a read-only section, we might
1213 need a copy reloc. We can't check reliably at this
1214 stage whether the section is read-only, as input
1215 sections have not yet been mapped to output sections.
1216 Tentatively set the flag for now, and correct in
1217 adjust_dynamic_symbol. */
1218 h->non_got_ref = 1;
1219
1220 if (!bfd_link_pic (info))
1221 {
1222 /* We may need a .plt entry if the function this reloc
1223 refers to is in a shared lib. */
1224 h->plt.refcount += 1;
1225 }
1226 }
1227
1228 /* If we are creating a shared library, and this is a reloc
1229 against a global symbol, or a non PC relative reloc
1230 against a local symbol, then we need to copy the reloc
1231 into the shared library. However, if we are linking with
1232 -Bsymbolic, we do not need to copy a reloc against a
1233 global symbol which is defined in an object we are
1234 including in the link (i.e., DEF_REGULAR is set). At
1235 this point we have not seen all the input files, so it is
1236 possible that DEF_REGULAR is not set now but will be set
1237 later (it is never cleared). In case of a weak definition,
1238 DEF_REGULAR may be cleared later by a strong definition in
1239 a shared library. We account for that possibility below by
1240 storing information in the relocs_copied field of the hash
1241 table entry. A similar situation occurs when creating
1242 shared libraries and symbol visibility changes render the
1243 symbol local.
1244
1245 If on the other hand, we are creating an executable, we
1246 may need to keep relocations for symbols satisfied by a
1247 dynamic library if we manage to avoid copy relocs for the
1248 symbol. */
1249 if ((bfd_link_pic (info)
1250 && (sec->flags & SEC_ALLOC) != 0
1251 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1252 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL
1253 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1254 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL
1255 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1256 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1257 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1258 || (h != NULL
1259 && (! SYMBOLIC_BIND (info, h)
1260 || h->root.type == bfd_link_hash_defweak
1261 || !h->def_regular))))
1262 || (ELIMINATE_COPY_RELOCS
1263 && !bfd_link_pic (info)
1264 && (sec->flags & SEC_ALLOC) != 0
1265 && h != NULL
1266 && (h->root.type == bfd_link_hash_defweak
1267 || !h->def_regular)))
1268 {
1269 struct elf_dyn_relocs *p;
1270 struct elf_dyn_relocs **head;
1271
1272 /* We must copy these reloc types into the output file.
1273 Create a reloc section in dynobj and make room for
1274 this reloc. */
1275 if (sreloc == NULL)
1276 {
1277 if (htab->elf.dynobj == NULL)
1278 htab->elf.dynobj = abfd;
1279
1280 sreloc = _bfd_elf_make_dynamic_reloc_section
1281 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1282
1283 if (sreloc == NULL)
1284 return FALSE;
1285 }
1286
1287 /* If this is a global symbol, we count the number of
1288 relocations we need for this symbol. */
1289 if (h != NULL)
1290 {
1291 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1292 }
1293 else
1294 {
1295 /* Track dynamic relocs needed for local syms too.
1296 We really need local syms available to do this
1297 easily. Oh well. */
1298 asection *s;
1299 void *vpp;
1300
1301 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1302 abfd, r_symndx);
1303 if (isym == NULL)
1304 return FALSE;
1305
1306 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1307 if (s == NULL)
1308 s = sec;
1309
1310 vpp = &elf_section_data (s)->local_dynrel;
1311 head = (struct elf_dyn_relocs **) vpp;
1312 }
1313
1314 p = *head;
1315 if (p == NULL || p->sec != sec)
1316 {
1317 bfd_size_type amt = sizeof *p;
1318 p = ((struct elf_dyn_relocs *)
1319 bfd_alloc (htab->elf.dynobj, amt));
1320 if (p == NULL)
1321 return FALSE;
1322 p->next = *head;
1323 *head = p;
1324 p->sec = sec;
1325 p->count = 0;
1326 p->pc_count = 0;
1327 }
1328
1329 p->count += 1;
1330 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1331 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL
1332 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1333 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1334 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1335 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1336 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1337 p->pc_count += 1;
1338 }
1339 break;
1340
1341 /* This relocation describes the C++ object vtable hierarchy.
1342 Reconstruct it for later use during GC. */
1343 case R_390_GNU_VTINHERIT:
1344 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1345 return FALSE;
1346 break;
1347
1348 /* This relocation describes which C++ vtable entries are actually
1349 used. Record for later use during GC. */
1350 case R_390_GNU_VTENTRY:
1351 BFD_ASSERT (h != NULL);
1352 if (h != NULL
1353 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1354 return FALSE;
1355 break;
1356
1357 default:
1358 break;
1359 }
1360 }
1361
1362 return TRUE;
1363 }
1364
1365 /* Return the section that should be marked against GC for a given
1366 relocation. */
1367
1368 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)1369 elf_s390_gc_mark_hook (asection *sec,
1370 struct bfd_link_info *info,
1371 Elf_Internal_Rela *rel,
1372 struct elf_link_hash_entry *h,
1373 Elf_Internal_Sym *sym)
1374 {
1375 if (h != NULL)
1376 switch (ELF64_R_TYPE (rel->r_info))
1377 {
1378 case R_390_GNU_VTINHERIT:
1379 case R_390_GNU_VTENTRY:
1380 return NULL;
1381 }
1382
1383 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1384 }
1385
1386 /* Update the got entry reference counts for the section being removed. */
1387
1388 static bfd_boolean
elf_s390_gc_sweep_hook(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)1389 elf_s390_gc_sweep_hook (bfd *abfd,
1390 struct bfd_link_info *info,
1391 asection *sec,
1392 const Elf_Internal_Rela *relocs)
1393 {
1394 struct elf_s390_link_hash_table *htab;
1395 Elf_Internal_Shdr *symtab_hdr;
1396 struct elf_link_hash_entry **sym_hashes;
1397 bfd_signed_vma *local_got_refcounts;
1398 const Elf_Internal_Rela *rel, *relend;
1399
1400 if (bfd_link_relocatable (info))
1401 return TRUE;
1402
1403 htab = elf_s390_hash_table (info);
1404 if (htab == NULL)
1405 return FALSE;
1406
1407 elf_section_data (sec)->local_dynrel = NULL;
1408
1409 symtab_hdr = &elf_symtab_hdr (abfd);
1410 sym_hashes = elf_sym_hashes (abfd);
1411 local_got_refcounts = elf_local_got_refcounts (abfd);
1412
1413 relend = relocs + sec->reloc_count;
1414 for (rel = relocs; rel < relend; rel++)
1415 {
1416 unsigned long r_symndx;
1417 unsigned int r_type;
1418 struct elf_link_hash_entry *h = NULL;
1419
1420 r_symndx = ELF64_R_SYM (rel->r_info);
1421 if (r_symndx >= symtab_hdr->sh_info)
1422 {
1423 struct elf_s390_link_hash_entry *eh;
1424 struct elf_dyn_relocs **pp;
1425 struct elf_dyn_relocs *p;
1426
1427 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1428 while (h->root.type == bfd_link_hash_indirect
1429 || h->root.type == bfd_link_hash_warning)
1430 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1431 eh = (struct elf_s390_link_hash_entry *) h;
1432
1433 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1434 if (p->sec == sec)
1435 {
1436 /* Everything must go for SEC. */
1437 *pp = p->next;
1438 break;
1439 }
1440 }
1441 else
1442 {
1443 Elf_Internal_Sym *isym;
1444
1445 /* A local symbol. */
1446 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1447 abfd, r_symndx);
1448 if (isym == NULL)
1449 return FALSE;
1450
1451 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1452 {
1453 struct plt_entry *plt = elf_s390_local_plt (abfd);
1454 if (plt[r_symndx].plt.refcount > 0)
1455 plt[r_symndx].plt.refcount--;
1456 }
1457 }
1458
1459 r_type = ELF64_R_TYPE (rel->r_info);
1460 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1461 switch (r_type)
1462 {
1463 case R_390_TLS_LDM64:
1464 if (htab->tls_ldm_got.refcount > 0)
1465 htab->tls_ldm_got.refcount -= 1;
1466 break;
1467 case R_390_GOTOFF16:
1468 case R_390_GOTOFF32:
1469 case R_390_GOTOFF64:
1470 if (h != NULL && s390_is_ifunc_symbol_p (h) && h->def_regular)
1471 {
1472 h->plt.refcount--;
1473 break;
1474 }
1475
1476 case R_390_GOTPC:
1477 case R_390_GOTPCDBL:
1478 break;
1479
1480 case R_390_TLS_GD64:
1481 case R_390_TLS_IE64:
1482 case R_390_TLS_GOTIE12:
1483 case R_390_TLS_GOTIE20:
1484 case R_390_TLS_GOTIE64:
1485 case R_390_TLS_IEENT:
1486 case R_390_GOT12:
1487 case R_390_GOT16:
1488 case R_390_GOT20:
1489 case R_390_GOT32:
1490 case R_390_GOT64:
1491 case R_390_GOTENT:
1492 if (h != NULL)
1493 {
1494 if (h->got.refcount > 0)
1495 h->got.refcount -= 1;
1496 }
1497 else if (local_got_refcounts != NULL)
1498 {
1499 if (local_got_refcounts[r_symndx] > 0)
1500 local_got_refcounts[r_symndx] -= 1;
1501 }
1502 break;
1503
1504 case R_390_8:
1505 case R_390_12:
1506 case R_390_16:
1507 case R_390_20:
1508 case R_390_32:
1509 case R_390_64:
1510 case R_390_PC16:
1511 case R_390_PC12DBL:
1512 case R_390_PC16DBL:
1513 case R_390_PC24DBL:
1514 case R_390_PC32:
1515 case R_390_PC32DBL:
1516 case R_390_PC64:
1517 if (bfd_link_pic (info))
1518 break;
1519 /* Fall through */
1520
1521 case R_390_PLT12DBL:
1522 case R_390_PLT16DBL:
1523 case R_390_PLT24DBL:
1524 case R_390_PLT32:
1525 case R_390_PLT32DBL:
1526 case R_390_PLT64:
1527 case R_390_PLTOFF16:
1528 case R_390_PLTOFF32:
1529 case R_390_PLTOFF64:
1530 if (h != NULL)
1531 {
1532 if (h->plt.refcount > 0)
1533 h->plt.refcount -= 1;
1534 }
1535 break;
1536
1537 case R_390_GOTPLT12:
1538 case R_390_GOTPLT16:
1539 case R_390_GOTPLT20:
1540 case R_390_GOTPLT32:
1541 case R_390_GOTPLT64:
1542 case R_390_GOTPLTENT:
1543 if (h != NULL)
1544 {
1545 if (h->plt.refcount > 0)
1546 {
1547 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1548 h->plt.refcount -= 1;
1549 }
1550 }
1551 else if (local_got_refcounts != NULL)
1552 {
1553 if (local_got_refcounts[r_symndx] > 0)
1554 local_got_refcounts[r_symndx] -= 1;
1555 }
1556 break;
1557
1558 default:
1559 break;
1560 }
1561 }
1562
1563 return TRUE;
1564 }
1565
1566 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1567 entry but we found we will not create any. Called when we find we will
1568 not have any PLT for this symbol, by for example
1569 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1570 or elf_s390_size_dynamic_sections if no dynamic sections will be
1571 created (we're only linking static objects). */
1572
1573 static void
elf_s390_adjust_gotplt(struct elf_s390_link_hash_entry * h)1574 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1575 {
1576 if (h->elf.root.type == bfd_link_hash_warning)
1577 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1578
1579 if (h->gotplt_refcount <= 0)
1580 return;
1581
1582 /* We simply add the number of gotplt references to the number
1583 * of got references for this symbol. */
1584 h->elf.got.refcount += h->gotplt_refcount;
1585 h->gotplt_refcount = -1;
1586 }
1587
1588 /* Adjust a symbol defined by a dynamic object and referenced by a
1589 regular object. The current definition is in some section of the
1590 dynamic object, but we're not including those sections. We have to
1591 change the definition to something the rest of the link can
1592 understand. */
1593
1594 static bfd_boolean
elf_s390_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1595 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1596 struct elf_link_hash_entry *h)
1597 {
1598 struct elf_s390_link_hash_table *htab;
1599 asection *s;
1600
1601 /* STT_GNU_IFUNC symbol must go through PLT. */
1602 if (s390_is_ifunc_symbol_p (h))
1603 {
1604 /* All local STT_GNU_IFUNC references must be treated as local
1605 calls via local PLT. */
1606 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1607 {
1608 bfd_size_type pc_count = 0, count = 0;
1609 struct elf_dyn_relocs **pp;
1610 struct elf_s390_link_hash_entry *eh;
1611 struct elf_dyn_relocs *p;
1612
1613 eh = (struct elf_s390_link_hash_entry *) h;
1614 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1615 {
1616 pc_count += p->pc_count;
1617 p->count -= p->pc_count;
1618 p->pc_count = 0;
1619 count += p->count;
1620 if (p->count == 0)
1621 *pp = p->next;
1622 else
1623 pp = &p->next;
1624 }
1625
1626 if (pc_count || count)
1627 {
1628 h->needs_plt = 1;
1629 h->non_got_ref = 1;
1630 if (h->plt.refcount <= 0)
1631 h->plt.refcount = 1;
1632 else
1633 h->plt.refcount += 1;
1634 }
1635 }
1636
1637 if (h->plt.refcount <= 0)
1638 {
1639 h->plt.offset = (bfd_vma) -1;
1640 h->needs_plt = 0;
1641 }
1642 return TRUE;
1643 }
1644
1645 /* If this is a function, put it in the procedure linkage table. We
1646 will fill in the contents of the procedure linkage table later
1647 (although we could actually do it here). */
1648 if (h->type == STT_FUNC
1649 || h->needs_plt)
1650 {
1651 if (h->plt.refcount <= 0
1652 || SYMBOL_CALLS_LOCAL (info, h)
1653 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1654 && h->root.type == bfd_link_hash_undefweak))
1655 {
1656 /* This case can occur if we saw a PLT32 reloc in an input
1657 file, but the symbol was never referred to by a dynamic
1658 object, or if all references were garbage collected. In
1659 such a case, we don't actually need to build a procedure
1660 linkage table, and we can just do a PC32 reloc instead. */
1661 h->plt.offset = (bfd_vma) -1;
1662 h->needs_plt = 0;
1663 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1664 }
1665
1666 return TRUE;
1667 }
1668 else
1669 /* It's possible that we incorrectly decided a .plt reloc was
1670 needed for an R_390_PC32 reloc to a non-function sym in
1671 check_relocs. We can't decide accurately between function and
1672 non-function syms in check-relocs; Objects loaded later in
1673 the link may change h->type. So fix it now. */
1674 h->plt.offset = (bfd_vma) -1;
1675
1676 /* If this is a weak symbol, and there is a real definition, the
1677 processor independent code will have arranged for us to see the
1678 real definition first, and we can just use the same value. */
1679 if (h->u.weakdef != NULL)
1680 {
1681 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1682 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1683 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1684 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1685 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1686 h->non_got_ref = h->u.weakdef->non_got_ref;
1687 return TRUE;
1688 }
1689
1690 /* This is a reference to a symbol defined by a dynamic object which
1691 is not a function. */
1692
1693 /* If we are creating a shared library, we must presume that the
1694 only references to the symbol are via the global offset table.
1695 For such cases we need not do anything here; the relocations will
1696 be handled correctly by relocate_section. */
1697 if (bfd_link_pic (info))
1698 return TRUE;
1699
1700 /* If there are no references to this symbol that do not use the
1701 GOT, we don't need to generate a copy reloc. */
1702 if (!h->non_got_ref)
1703 return TRUE;
1704
1705 /* If -z nocopyreloc was given, we won't generate them either. */
1706 if (info->nocopyreloc)
1707 {
1708 h->non_got_ref = 0;
1709 return TRUE;
1710 }
1711
1712 if (ELIMINATE_COPY_RELOCS)
1713 {
1714 struct elf_s390_link_hash_entry * eh;
1715 struct elf_dyn_relocs *p;
1716
1717 eh = (struct elf_s390_link_hash_entry *) h;
1718 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1719 {
1720 s = p->sec->output_section;
1721 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1722 break;
1723 }
1724
1725 /* If we didn't find any dynamic relocs in read-only sections, then
1726 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1727 if (p == NULL)
1728 {
1729 h->non_got_ref = 0;
1730 return TRUE;
1731 }
1732 }
1733
1734 /* We must allocate the symbol in our .dynbss section, which will
1735 become part of the .bss section of the executable. There will be
1736 an entry for this symbol in the .dynsym section. The dynamic
1737 object will contain position independent code, so all references
1738 from the dynamic object to this symbol will go through the global
1739 offset table. The dynamic linker will use the .dynsym entry to
1740 determine the address it must put in the global offset table, so
1741 both the dynamic object and the regular object will refer to the
1742 same memory location for the variable. */
1743
1744 htab = elf_s390_hash_table (info);
1745 if (htab == NULL)
1746 return FALSE;
1747
1748 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1749 copy the initial value out of the dynamic object and into the
1750 runtime process image. */
1751 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1752 {
1753 htab->srelbss->size += sizeof (Elf64_External_Rela);
1754 h->needs_copy = 1;
1755 }
1756
1757 s = htab->sdynbss;
1758
1759 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1760 }
1761
1762 /* Allocate space in .plt, .got and associated reloc sections for
1763 dynamic relocs. */
1764
1765 static bfd_boolean
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1766 allocate_dynrelocs (struct elf_link_hash_entry *h,
1767 void * inf)
1768 {
1769 struct bfd_link_info *info;
1770 struct elf_s390_link_hash_table *htab;
1771 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1772 struct elf_dyn_relocs *p;
1773
1774 if (h->root.type == bfd_link_hash_indirect)
1775 return TRUE;
1776
1777 info = (struct bfd_link_info *) inf;
1778 htab = elf_s390_hash_table (info);
1779 if (htab == NULL)
1780 return FALSE;
1781
1782 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1783 here if it is defined and referenced in a non-shared object. */
1784 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1785 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1786 else if (htab->elf.dynamic_sections_created
1787 && h->plt.refcount > 0)
1788 {
1789 /* Make sure this symbol is output as a dynamic symbol.
1790 Undefined weak syms won't yet be marked as dynamic. */
1791 if (h->dynindx == -1
1792 && !h->forced_local)
1793 {
1794 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1795 return FALSE;
1796 }
1797
1798 if (bfd_link_pic (info)
1799 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1800 {
1801 asection *s = htab->elf.splt;
1802
1803 /* If this is the first .plt entry, make room for the special
1804 first entry. */
1805 if (s->size == 0)
1806 s->size += PLT_FIRST_ENTRY_SIZE;
1807
1808 h->plt.offset = s->size;
1809
1810 /* If this symbol is not defined in a regular file, and we are
1811 not generating a shared library, then set the symbol to this
1812 location in the .plt. This is required to make function
1813 pointers compare as equal between the normal executable and
1814 the shared library. */
1815 if (! bfd_link_pic (info)
1816 && !h->def_regular)
1817 {
1818 h->root.u.def.section = s;
1819 h->root.u.def.value = h->plt.offset;
1820 }
1821
1822 /* Make room for this entry. */
1823 s->size += PLT_ENTRY_SIZE;
1824
1825 /* We also need to make an entry in the .got.plt section, which
1826 will be placed in the .got section by the linker script. */
1827 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1828
1829 /* We also need to make an entry in the .rela.plt section. */
1830 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1831 }
1832 else
1833 {
1834 h->plt.offset = (bfd_vma) -1;
1835 h->needs_plt = 0;
1836 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1837 }
1838 }
1839 else
1840 {
1841 h->plt.offset = (bfd_vma) -1;
1842 h->needs_plt = 0;
1843 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1844 }
1845
1846 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1847 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1848 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1849 we can save the dynamic TLS relocation. */
1850 if (h->got.refcount > 0
1851 && !bfd_link_pic (info)
1852 && h->dynindx == -1
1853 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1854 {
1855 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1856 /* For the GOTIE access without a literal pool entry the offset has
1857 to be stored somewhere. The immediate value in the instruction
1858 is not bit enough so the value is stored in the got. */
1859 {
1860 h->got.offset = htab->elf.sgot->size;
1861 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1862 }
1863 else
1864 h->got.offset = (bfd_vma) -1;
1865 }
1866 else if (h->got.refcount > 0)
1867 {
1868 asection *s;
1869 bfd_boolean dyn;
1870 int tls_type = elf_s390_hash_entry(h)->tls_type;
1871
1872 /* Make sure this symbol is output as a dynamic symbol.
1873 Undefined weak syms won't yet be marked as dynamic. */
1874 if (h->dynindx == -1
1875 && !h->forced_local)
1876 {
1877 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1878 return FALSE;
1879 }
1880
1881 s = htab->elf.sgot;
1882 h->got.offset = s->size;
1883 s->size += GOT_ENTRY_SIZE;
1884 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1885 if (tls_type == GOT_TLS_GD)
1886 s->size += GOT_ENTRY_SIZE;
1887 dyn = htab->elf.dynamic_sections_created;
1888 /* R_390_TLS_IE64 needs one dynamic relocation,
1889 R_390_TLS_GD64 needs one if local symbol and two if global. */
1890 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1891 || tls_type >= GOT_TLS_IE)
1892 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1893 else if (tls_type == GOT_TLS_GD)
1894 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1895 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1896 || h->root.type != bfd_link_hash_undefweak)
1897 && (bfd_link_pic (info)
1898 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1899 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1900 }
1901 else
1902 h->got.offset = (bfd_vma) -1;
1903
1904 if (eh->dyn_relocs == NULL)
1905 return TRUE;
1906
1907 /* In the shared -Bsymbolic case, discard space allocated for
1908 dynamic pc-relative relocs against symbols which turn out to be
1909 defined in regular objects. For the normal shared case, discard
1910 space for pc-relative relocs that have become local due to symbol
1911 visibility changes. */
1912
1913 if (bfd_link_pic (info))
1914 {
1915 if (SYMBOL_CALLS_LOCAL (info, h))
1916 {
1917 struct elf_dyn_relocs **pp;
1918
1919 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1920 {
1921 p->count -= p->pc_count;
1922 p->pc_count = 0;
1923 if (p->count == 0)
1924 *pp = p->next;
1925 else
1926 pp = &p->next;
1927 }
1928 }
1929
1930 /* Also discard relocs on undefined weak syms with non-default
1931 visibility. */
1932 if (eh->dyn_relocs != NULL
1933 && h->root.type == bfd_link_hash_undefweak)
1934 {
1935 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1936 eh->dyn_relocs = NULL;
1937
1938 /* Make sure undefined weak symbols are output as a dynamic
1939 symbol in PIEs. */
1940 else if (h->dynindx == -1
1941 && !h->forced_local)
1942 {
1943 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1944 return FALSE;
1945 }
1946 }
1947 }
1948 else if (ELIMINATE_COPY_RELOCS)
1949 {
1950 /* For the non-shared case, discard space for relocs against
1951 symbols which turn out to need copy relocs or are not
1952 dynamic. */
1953
1954 if (!h->non_got_ref
1955 && ((h->def_dynamic
1956 && !h->def_regular)
1957 || (htab->elf.dynamic_sections_created
1958 && (h->root.type == bfd_link_hash_undefweak
1959 || h->root.type == bfd_link_hash_undefined))))
1960 {
1961 /* Make sure this symbol is output as a dynamic symbol.
1962 Undefined weak syms won't yet be marked as dynamic. */
1963 if (h->dynindx == -1
1964 && !h->forced_local)
1965 {
1966 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1967 return FALSE;
1968 }
1969
1970 /* If that succeeded, we know we'll be keeping all the
1971 relocs. */
1972 if (h->dynindx != -1)
1973 goto keep;
1974 }
1975
1976 eh->dyn_relocs = NULL;
1977
1978 keep: ;
1979 }
1980
1981 /* Finally, allocate space. */
1982 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1983 {
1984 asection *sreloc = elf_section_data (p->sec)->sreloc;
1985 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1986 }
1987
1988 return TRUE;
1989 }
1990
1991 /* Find any dynamic relocs that apply to read-only sections. */
1992
1993 static bfd_boolean
readonly_dynrelocs(struct elf_link_hash_entry * h,void * inf)1994 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1995 {
1996 struct elf_s390_link_hash_entry *eh;
1997 struct elf_dyn_relocs *p;
1998
1999 eh = (struct elf_s390_link_hash_entry *) h;
2000 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2001 {
2002 asection *s = p->sec->output_section;
2003
2004 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2005 {
2006 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2007
2008 info->flags |= DF_TEXTREL;
2009
2010 /* Not an error, just cut short the traversal. */
2011 return FALSE;
2012 }
2013 }
2014 return TRUE;
2015 }
2016
2017 /* Set the sizes of the dynamic sections. */
2018
2019 static bfd_boolean
elf_s390_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)2020 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2021 struct bfd_link_info *info)
2022 {
2023 struct elf_s390_link_hash_table *htab;
2024 bfd *dynobj;
2025 asection *s;
2026 bfd_boolean relocs;
2027 bfd *ibfd;
2028
2029 htab = elf_s390_hash_table (info);
2030 if (htab == NULL)
2031 return FALSE;
2032
2033 dynobj = htab->elf.dynobj;
2034 if (dynobj == NULL)
2035 abort ();
2036
2037 if (htab->elf.dynamic_sections_created)
2038 {
2039 /* Set the contents of the .interp section to the interpreter. */
2040 if (bfd_link_executable (info) && !info->nointerp)
2041 {
2042 s = bfd_get_linker_section (dynobj, ".interp");
2043 if (s == NULL)
2044 abort ();
2045 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2046 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2047 }
2048 }
2049
2050 /* Set up .got offsets for local syms, and space for local dynamic
2051 relocs. */
2052 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2053 {
2054 bfd_signed_vma *local_got;
2055 bfd_signed_vma *end_local_got;
2056 char *local_tls_type;
2057 bfd_size_type locsymcount;
2058 Elf_Internal_Shdr *symtab_hdr;
2059 asection *srela;
2060 struct plt_entry *local_plt;
2061 unsigned int i;
2062
2063 if (! is_s390_elf (ibfd))
2064 continue;
2065
2066 for (s = ibfd->sections; s != NULL; s = s->next)
2067 {
2068 struct elf_dyn_relocs *p;
2069
2070 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2071 {
2072 if (!bfd_is_abs_section (p->sec)
2073 && bfd_is_abs_section (p->sec->output_section))
2074 {
2075 /* Input section has been discarded, either because
2076 it is a copy of a linkonce section or due to
2077 linker script /DISCARD/, so we'll be discarding
2078 the relocs too. */
2079 }
2080 else if (p->count != 0)
2081 {
2082 srela = elf_section_data (p->sec)->sreloc;
2083 srela->size += p->count * sizeof (Elf64_External_Rela);
2084 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2085 info->flags |= DF_TEXTREL;
2086 }
2087 }
2088 }
2089
2090 local_got = elf_local_got_refcounts (ibfd);
2091 if (!local_got)
2092 continue;
2093
2094 symtab_hdr = &elf_symtab_hdr (ibfd);
2095 locsymcount = symtab_hdr->sh_info;
2096 end_local_got = local_got + locsymcount;
2097 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2098 s = htab->elf.sgot;
2099 srela = htab->elf.srelgot;
2100 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2101 {
2102 if (*local_got > 0)
2103 {
2104 *local_got = s->size;
2105 s->size += GOT_ENTRY_SIZE;
2106 if (*local_tls_type == GOT_TLS_GD)
2107 s->size += GOT_ENTRY_SIZE;
2108 if (bfd_link_pic (info))
2109 srela->size += sizeof (Elf64_External_Rela);
2110 }
2111 else
2112 *local_got = (bfd_vma) -1;
2113 }
2114
2115 local_plt = elf_s390_local_plt (ibfd);
2116 for (i = 0; i < symtab_hdr->sh_info; i++)
2117 {
2118 if (local_plt[i].plt.refcount > 0)
2119 {
2120 local_plt[i].plt.offset = htab->elf.iplt->size;
2121 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2122 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2123 htab->elf.irelplt->size += sizeof (Elf64_External_Rela);
2124 }
2125 else
2126 local_plt[i].plt.offset = (bfd_vma) -1;
2127 }
2128 }
2129
2130 if (htab->tls_ldm_got.refcount > 0)
2131 {
2132 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2133 relocs. */
2134 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2135 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2136 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2137 }
2138 else
2139 htab->tls_ldm_got.offset = -1;
2140
2141 /* Allocate global sym .plt and .got entries, and space for global
2142 sym dynamic relocs. */
2143 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2144
2145 /* We now have determined the sizes of the various dynamic sections.
2146 Allocate memory for them. */
2147 relocs = FALSE;
2148 for (s = dynobj->sections; s != NULL; s = s->next)
2149 {
2150 if ((s->flags & SEC_LINKER_CREATED) == 0)
2151 continue;
2152
2153 if (s == htab->elf.splt
2154 || s == htab->elf.sgot
2155 || s == htab->elf.sgotplt
2156 || s == htab->sdynbss
2157 || s == htab->elf.iplt
2158 || s == htab->elf.igotplt
2159 || s == htab->irelifunc)
2160 {
2161 /* Strip this section if we don't need it; see the
2162 comment below. */
2163 }
2164 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2165 {
2166 if (s->size != 0 && s != htab->elf.srelplt)
2167 relocs = TRUE;
2168
2169 /* We use the reloc_count field as a counter if we need
2170 to copy relocs into the output file. */
2171 s->reloc_count = 0;
2172 }
2173 else
2174 {
2175 /* It's not one of our sections, so don't allocate space. */
2176 continue;
2177 }
2178
2179 if (s->size == 0)
2180 {
2181 /* If we don't need this section, strip it from the
2182 output file. This is to handle .rela.bss and
2183 .rela.plt. We must create it in
2184 create_dynamic_sections, because it must be created
2185 before the linker maps input sections to output
2186 sections. The linker does that before
2187 adjust_dynamic_symbol is called, and it is that
2188 function which decides whether anything needs to go
2189 into these sections. */
2190
2191 s->flags |= SEC_EXCLUDE;
2192 continue;
2193 }
2194
2195 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2196 continue;
2197
2198 /* Allocate memory for the section contents. We use bfd_zalloc
2199 here in case unused entries are not reclaimed before the
2200 section's contents are written out. This should not happen,
2201 but this way if it does, we get a R_390_NONE reloc instead
2202 of garbage. */
2203 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2204 if (s->contents == NULL)
2205 return FALSE;
2206 }
2207
2208 if (htab->elf.dynamic_sections_created)
2209 {
2210 /* Add some entries to the .dynamic section. We fill in the
2211 values later, in elf_s390_finish_dynamic_sections, but we
2212 must add the entries now so that we get the correct size for
2213 the .dynamic section. The DT_DEBUG entry is filled in by the
2214 dynamic linker and used by the debugger. */
2215 #define add_dynamic_entry(TAG, VAL) \
2216 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2217
2218 if (bfd_link_executable (info))
2219 {
2220 if (!add_dynamic_entry (DT_DEBUG, 0))
2221 return FALSE;
2222 }
2223
2224 if (htab->elf.splt->size != 0)
2225 {
2226 if (!add_dynamic_entry (DT_PLTGOT, 0)
2227 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2228 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2229 || !add_dynamic_entry (DT_JMPREL, 0))
2230 return FALSE;
2231 }
2232
2233 if (relocs)
2234 {
2235 if (!add_dynamic_entry (DT_RELA, 0)
2236 || !add_dynamic_entry (DT_RELASZ, 0)
2237 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2238 return FALSE;
2239
2240 /* If any dynamic relocs apply to a read-only section,
2241 then we need a DT_TEXTREL entry. */
2242 if ((info->flags & DF_TEXTREL) == 0)
2243 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2244 info);
2245
2246 if ((info->flags & DF_TEXTREL) != 0)
2247 {
2248 if (!add_dynamic_entry (DT_TEXTREL, 0))
2249 return FALSE;
2250 }
2251 }
2252 }
2253 #undef add_dynamic_entry
2254
2255 return TRUE;
2256 }
2257
2258 /* Return the base VMA address which should be subtracted from real addresses
2259 when resolving @dtpoff relocation.
2260 This is PT_TLS segment p_vaddr. */
2261
2262 static bfd_vma
dtpoff_base(struct bfd_link_info * info)2263 dtpoff_base (struct bfd_link_info *info)
2264 {
2265 /* If tls_sec is NULL, we should have signalled an error already. */
2266 if (elf_hash_table (info)->tls_sec == NULL)
2267 return 0;
2268 return elf_hash_table (info)->tls_sec->vma;
2269 }
2270
2271 /* Return the relocation value for @tpoff relocation
2272 if STT_TLS virtual address is ADDRESS. */
2273
2274 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)2275 tpoff (struct bfd_link_info *info, bfd_vma address)
2276 {
2277 struct elf_link_hash_table *htab = elf_hash_table (info);
2278
2279 /* If tls_sec is NULL, we should have signalled an error already. */
2280 if (htab->tls_sec == NULL)
2281 return 0;
2282 return htab->tls_size + htab->tls_sec->vma - address;
2283 }
2284
2285 /* Complain if TLS instruction relocation is against an invalid
2286 instruction. */
2287
2288 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)2289 invalid_tls_insn (bfd *input_bfd,
2290 asection *input_section,
2291 Elf_Internal_Rela *rel)
2292 {
2293 reloc_howto_type *howto;
2294
2295 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2296 (*_bfd_error_handler)
2297 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2298 input_bfd,
2299 input_section,
2300 (long) rel->r_offset,
2301 howto->name);
2302 bfd_set_error (bfd_error_bad_value);
2303 }
2304
2305 /* Relocate a 390 ELF section. */
2306
2307 static bfd_boolean
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)2308 elf_s390_relocate_section (bfd *output_bfd,
2309 struct bfd_link_info *info,
2310 bfd *input_bfd,
2311 asection *input_section,
2312 bfd_byte *contents,
2313 Elf_Internal_Rela *relocs,
2314 Elf_Internal_Sym *local_syms,
2315 asection **local_sections)
2316 {
2317 struct elf_s390_link_hash_table *htab;
2318 Elf_Internal_Shdr *symtab_hdr;
2319 struct elf_link_hash_entry **sym_hashes;
2320 bfd_vma *local_got_offsets;
2321 Elf_Internal_Rela *rel;
2322 Elf_Internal_Rela *relend;
2323
2324 BFD_ASSERT (is_s390_elf (input_bfd));
2325
2326 htab = elf_s390_hash_table (info);
2327 if (htab == NULL)
2328 return FALSE;
2329
2330 symtab_hdr = &elf_symtab_hdr (input_bfd);
2331 sym_hashes = elf_sym_hashes (input_bfd);
2332 local_got_offsets = elf_local_got_offsets (input_bfd);
2333
2334 rel = relocs;
2335 relend = relocs + input_section->reloc_count;
2336 for (; rel < relend; rel++)
2337 {
2338 unsigned int r_type;
2339 reloc_howto_type *howto;
2340 unsigned long r_symndx;
2341 struct elf_link_hash_entry *h;
2342 Elf_Internal_Sym *sym;
2343 asection *sec;
2344 bfd_vma off;
2345 bfd_vma relocation;
2346 bfd_boolean unresolved_reloc;
2347 bfd_reloc_status_type r;
2348 int tls_type;
2349 asection *base_got = htab->elf.sgot;
2350
2351 r_type = ELF64_R_TYPE (rel->r_info);
2352 if (r_type == (int) R_390_GNU_VTINHERIT
2353 || r_type == (int) R_390_GNU_VTENTRY)
2354 continue;
2355 if (r_type >= (int) R_390_max)
2356 {
2357 bfd_set_error (bfd_error_bad_value);
2358 return FALSE;
2359 }
2360
2361 howto = elf_howto_table + r_type;
2362 r_symndx = ELF64_R_SYM (rel->r_info);
2363
2364 h = NULL;
2365 sym = NULL;
2366 sec = NULL;
2367 unresolved_reloc = FALSE;
2368 if (r_symndx < symtab_hdr->sh_info)
2369 {
2370 sym = local_syms + r_symndx;
2371 sec = local_sections[r_symndx];
2372
2373 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2374 {
2375 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2376 if (local_plt == NULL)
2377 return FALSE;
2378
2379 /* Address of the PLT slot. */
2380 relocation = (htab->elf.iplt->output_section->vma
2381 + htab->elf.iplt->output_offset
2382 + local_plt[r_symndx].plt.offset);
2383
2384 switch (r_type)
2385 {
2386 case R_390_PLTOFF16:
2387 case R_390_PLTOFF32:
2388 case R_390_PLTOFF64:
2389 relocation -= htab->elf.sgot->output_section->vma;
2390 break;
2391 case R_390_GOTPLT12:
2392 case R_390_GOTPLT16:
2393 case R_390_GOTPLT20:
2394 case R_390_GOTPLT32:
2395 case R_390_GOTPLT64:
2396 case R_390_GOTPLTENT:
2397 case R_390_GOT12:
2398 case R_390_GOT16:
2399 case R_390_GOT20:
2400 case R_390_GOT32:
2401 case R_390_GOT64:
2402 case R_390_GOTENT:
2403 {
2404 /* Write the PLT slot address into the GOT slot. */
2405 bfd_put_64 (output_bfd, relocation,
2406 htab->elf.sgot->contents +
2407 local_got_offsets[r_symndx]);
2408 relocation = (local_got_offsets[r_symndx] +
2409 htab->elf.sgot->output_offset);
2410
2411 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2412 relocation += htab->elf.sgot->output_section->vma;
2413 break;
2414 }
2415 default:
2416 break;
2417 }
2418 /* The output section is needed later in
2419 finish_dynamic_section when creating the dynamic
2420 relocation. */
2421 local_plt[r_symndx].sec = sec;
2422 goto do_relocation;
2423 }
2424 else
2425 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2426 }
2427 else
2428 {
2429 bfd_boolean warned ATTRIBUTE_UNUSED;
2430 bfd_boolean ignored ATTRIBUTE_UNUSED;
2431
2432 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2433 r_symndx, symtab_hdr, sym_hashes,
2434 h, sec, relocation,
2435 unresolved_reloc, warned, ignored);
2436 }
2437
2438 if (sec != NULL && discarded_section (sec))
2439 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2440 rel, 1, relend, howto, 0, contents);
2441
2442 if (bfd_link_relocatable (info))
2443 continue;
2444
2445 switch (r_type)
2446 {
2447 case R_390_GOTPLT12:
2448 case R_390_GOTPLT16:
2449 case R_390_GOTPLT20:
2450 case R_390_GOTPLT32:
2451 case R_390_GOTPLT64:
2452 case R_390_GOTPLTENT:
2453 /* There are three cases for a GOTPLT relocation. 1) The
2454 relocation is against the jump slot entry of a plt that
2455 will get emitted to the output file. 2) The relocation
2456 is against the jump slot of a plt entry that has been
2457 removed. elf_s390_adjust_gotplt has created a GOT entry
2458 as replacement. 3) The relocation is against a local symbol.
2459 Cases 2) and 3) are the same as the GOT relocation code
2460 so we just have to test for case 1 and fall through for
2461 the other two. */
2462 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2463 {
2464 bfd_vma plt_index;
2465
2466 if (s390_is_ifunc_symbol_p (h))
2467 {
2468 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2469 relocation = (plt_index * GOT_ENTRY_SIZE +
2470 htab->elf.igotplt->output_offset);
2471 if (r_type == R_390_GOTPLTENT)
2472 relocation += htab->elf.igotplt->output_section->vma;
2473 }
2474 else
2475 {
2476 /* Calc. index no.
2477 Current offset - size first entry / entry size. */
2478 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2479 PLT_ENTRY_SIZE;
2480
2481 /* Offset in GOT is PLT index plus GOT headers(3)
2482 times 8, addr & GOT addr. */
2483 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2484 if (r_type == R_390_GOTPLTENT)
2485 relocation += htab->elf.sgot->output_section->vma;
2486 }
2487 unresolved_reloc = FALSE;
2488 break;
2489 }
2490 /* Fall through. */
2491
2492 case R_390_GOT12:
2493 case R_390_GOT16:
2494 case R_390_GOT20:
2495 case R_390_GOT32:
2496 case R_390_GOT64:
2497 case R_390_GOTENT:
2498 /* Relocation is to the entry for this symbol in the global
2499 offset table. */
2500 if (base_got == NULL)
2501 abort ();
2502
2503 if (h != NULL)
2504 {
2505 bfd_boolean dyn;
2506
2507 off = h->got.offset;
2508 dyn = htab->elf.dynamic_sections_created;
2509
2510 if (s390_is_ifunc_symbol_p (h))
2511 {
2512 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2513 if (off == (bfd_vma)-1)
2514 {
2515 /* No explicit GOT usage so redirect to the
2516 got.iplt slot. */
2517 base_got = htab->elf.igotplt;
2518 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2519 }
2520 else
2521 {
2522 /* Explicit GOT slots must contain the address
2523 of the PLT slot. This will be handled in
2524 finish_dynamic_symbol. */
2525 }
2526 }
2527 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2528 bfd_link_pic (info),
2529 h)
2530 || (bfd_link_pic (info)
2531 && SYMBOL_REFERENCES_LOCAL (info, h))
2532 || (ELF_ST_VISIBILITY (h->other)
2533 && h->root.type == bfd_link_hash_undefweak))
2534 {
2535 /* This is actually a static link, or it is a
2536 -Bsymbolic link and the symbol is defined
2537 locally, or the symbol was forced to be local
2538 because of a version file. We must initialize
2539 this entry in the global offset table. Since the
2540 offset must always be a multiple of 2, we use the
2541 least significant bit to record whether we have
2542 initialized it already.
2543
2544 When doing a dynamic link, we create a .rel.got
2545 relocation entry to initialize the value. This
2546 is done in the finish_dynamic_symbol routine. */
2547 if ((off & 1) != 0)
2548 off &= ~1;
2549 else
2550 {
2551 bfd_put_64 (output_bfd, relocation,
2552 base_got->contents + off);
2553 h->got.offset |= 1;
2554 }
2555
2556 if ((h->def_regular
2557 && bfd_link_pic (info)
2558 && SYMBOL_REFERENCES_LOCAL (info, h))
2559 /* lgrl rx,sym@GOTENT -> larl rx, sym */
2560 && ((r_type == R_390_GOTENT
2561 && (bfd_get_16 (input_bfd,
2562 contents + rel->r_offset - 2)
2563 & 0xff0f) == 0xc408)
2564 /* lg rx, sym@GOT(r12) -> larl rx, sym */
2565 || (r_type == R_390_GOT20
2566 && (bfd_get_32 (input_bfd,
2567 contents + rel->r_offset - 2)
2568 & 0xff00f000) == 0xe300c000
2569 && bfd_get_8 (input_bfd,
2570 contents + rel->r_offset + 3) == 0x04)))
2571
2572 {
2573 unsigned short new_insn =
2574 (0xc000 | (bfd_get_8 (input_bfd,
2575 contents + rel->r_offset - 1) & 0xf0));
2576 bfd_put_16 (output_bfd, new_insn,
2577 contents + rel->r_offset - 2);
2578 r_type = R_390_PC32DBL;
2579 rel->r_addend = 2;
2580 howto = elf_howto_table + r_type;
2581 relocation = h->root.u.def.value
2582 + h->root.u.def.section->output_section->vma
2583 + h->root.u.def.section->output_offset;
2584 goto do_relocation;
2585 }
2586 }
2587 else
2588 unresolved_reloc = FALSE;
2589 }
2590 else
2591 {
2592 if (local_got_offsets == NULL)
2593 abort ();
2594
2595 off = local_got_offsets[r_symndx];
2596
2597 /* The offset must always be a multiple of 8. We use
2598 the least significant bit to record whether we have
2599 already generated the necessary reloc. */
2600 if ((off & 1) != 0)
2601 off &= ~1;
2602 else
2603 {
2604 bfd_put_64 (output_bfd, relocation,
2605 htab->elf.sgot->contents + off);
2606
2607 if (bfd_link_pic (info))
2608 {
2609 asection *s;
2610 Elf_Internal_Rela outrel;
2611 bfd_byte *loc;
2612
2613 s = htab->elf.srelgot;
2614 if (s == NULL)
2615 abort ();
2616
2617 outrel.r_offset = (htab->elf.sgot->output_section->vma
2618 + htab->elf.sgot->output_offset
2619 + off);
2620 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2621 outrel.r_addend = relocation;
2622 loc = s->contents;
2623 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2624 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2625 }
2626
2627 local_got_offsets[r_symndx] |= 1;
2628 }
2629 }
2630
2631 if (off >= (bfd_vma) -2)
2632 abort ();
2633
2634 relocation = base_got->output_offset + off;
2635
2636 /* For @GOTENT the relocation is against the offset between
2637 the instruction and the symbols entry in the GOT and not
2638 between the start of the GOT and the symbols entry. We
2639 add the vma of the GOT to get the correct value. */
2640 if ( r_type == R_390_GOTENT
2641 || r_type == R_390_GOTPLTENT)
2642 relocation += base_got->output_section->vma;
2643
2644 break;
2645
2646 case R_390_GOTOFF16:
2647 case R_390_GOTOFF32:
2648 case R_390_GOTOFF64:
2649 /* Relocation is relative to the start of the global offset
2650 table. */
2651
2652 if (h != NULL
2653 && s390_is_ifunc_symbol_p (h)
2654 && h->def_regular
2655 && !bfd_link_executable (info))
2656 {
2657 relocation = (htab->elf.iplt->output_section->vma
2658 + htab->elf.iplt->output_offset
2659 + h->plt.offset
2660 - htab->elf.sgot->output_section->vma);
2661 goto do_relocation;
2662 }
2663
2664 /* Note that sgot->output_offset is not involved in this
2665 calculation. We always want the start of .got. If we
2666 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2667 permitted by the ABI, we might have to change this
2668 calculation. */
2669 relocation -= htab->elf.sgot->output_section->vma;
2670 break;
2671
2672 case R_390_GOTPC:
2673 case R_390_GOTPCDBL:
2674 /* Use global offset table as symbol value. */
2675 relocation = htab->elf.sgot->output_section->vma;
2676 unresolved_reloc = FALSE;
2677 break;
2678
2679 case R_390_PLT12DBL:
2680 case R_390_PLT16DBL:
2681 case R_390_PLT24DBL:
2682 case R_390_PLT32:
2683 case R_390_PLT32DBL:
2684 case R_390_PLT64:
2685 /* Relocation is to the entry for this symbol in the
2686 procedure linkage table. */
2687
2688 /* Resolve a PLT32 reloc against a local symbol directly,
2689 without using the procedure linkage table. */
2690 if (h == NULL)
2691 break;
2692
2693 if (h->plt.offset == (bfd_vma) -1
2694 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2695 {
2696 /* We didn't make a PLT entry for this symbol. This
2697 happens when statically linking PIC code, or when
2698 using -Bsymbolic. */
2699 break;
2700 }
2701 if (s390_is_ifunc_symbol_p (h))
2702 relocation = (htab->elf.iplt->output_section->vma
2703 + htab->elf.iplt->output_offset
2704 + h->plt.offset);
2705 else
2706 relocation = (htab->elf.splt->output_section->vma
2707 + htab->elf.splt->output_offset
2708 + h->plt.offset);
2709 unresolved_reloc = FALSE;
2710 break;
2711
2712 case R_390_PLTOFF16:
2713 case R_390_PLTOFF32:
2714 case R_390_PLTOFF64:
2715 /* Relocation is to the entry for this symbol in the
2716 procedure linkage table relative to the start of the GOT. */
2717
2718 /* For local symbols or if we didn't make a PLT entry for
2719 this symbol resolve the symbol directly. */
2720 if (h == NULL
2721 || h->plt.offset == (bfd_vma) -1
2722 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2723 {
2724 relocation -= htab->elf.sgot->output_section->vma;
2725 break;
2726 }
2727
2728 if (s390_is_ifunc_symbol_p (h))
2729 relocation = (htab->elf.iplt->output_section->vma
2730 + htab->elf.iplt->output_offset
2731 + h->plt.offset
2732 - htab->elf.sgot->output_section->vma);
2733 else
2734 relocation = (htab->elf.splt->output_section->vma
2735 + htab->elf.splt->output_offset
2736 + h->plt.offset
2737 - htab->elf.sgot->output_section->vma);
2738 unresolved_reloc = FALSE;
2739 break;
2740
2741 case R_390_PC16:
2742 case R_390_PC12DBL:
2743 case R_390_PC16DBL:
2744 case R_390_PC24DBL:
2745 case R_390_PC32:
2746 case R_390_PC32DBL:
2747 case R_390_PC64:
2748 /* The target of these relocs are instruction operands
2749 residing in read-only sections. We cannot emit a runtime
2750 reloc for it. */
2751 if (h != NULL
2752 && s390_is_ifunc_symbol_p (h)
2753 && h->def_regular
2754 && bfd_link_pic (info))
2755 {
2756 relocation = (htab->elf.iplt->output_section->vma
2757 + htab->elf.iplt->output_offset
2758 + h->plt.offset);
2759 goto do_relocation;
2760 }
2761
2762 case R_390_8:
2763 case R_390_16:
2764 case R_390_32:
2765 case R_390_64:
2766
2767 if (h != NULL
2768 && s390_is_ifunc_symbol_p (h)
2769 && h->def_regular)
2770 {
2771 if (!bfd_link_pic (info) || !h->non_got_ref)
2772 {
2773 /* For a non-shared object STT_GNU_IFUNC symbol must
2774 go through PLT. */
2775 relocation = (htab->elf.iplt->output_section->vma
2776 + htab->elf.iplt->output_offset
2777 + h ->plt.offset);
2778 goto do_relocation;
2779 }
2780 else
2781 {
2782 /* For shared objects a runtime relocation is needed. */
2783
2784 Elf_Internal_Rela outrel;
2785 asection *sreloc;
2786
2787 /* Need a dynamic relocation to get the real function
2788 address. */
2789 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2790 info,
2791 input_section,
2792 rel->r_offset);
2793 if (outrel.r_offset == (bfd_vma) -1
2794 || outrel.r_offset == (bfd_vma) -2)
2795 abort ();
2796
2797 outrel.r_offset += (input_section->output_section->vma
2798 + input_section->output_offset);
2799
2800 if (h->dynindx == -1
2801 || h->forced_local
2802 || bfd_link_executable (info))
2803 {
2804 /* This symbol is resolved locally. */
2805 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
2806 outrel.r_addend = (h->root.u.def.value
2807 + h->root.u.def.section->output_section->vma
2808 + h->root.u.def.section->output_offset);
2809 }
2810 else
2811 {
2812 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2813 outrel.r_addend = 0;
2814 }
2815
2816 sreloc = htab->elf.irelifunc;
2817 elf_append_rela (output_bfd, sreloc, &outrel);
2818
2819 /* If this reloc is against an external symbol, we
2820 do not want to fiddle with the addend. Otherwise,
2821 we need to include the symbol value so that it
2822 becomes an addend for the dynamic reloc. For an
2823 internal symbol, we have updated addend. */
2824 continue;
2825 }
2826 }
2827
2828 if ((input_section->flags & SEC_ALLOC) == 0)
2829 break;
2830
2831 if ((bfd_link_pic (info)
2832 && (h == NULL
2833 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2834 || h->root.type != bfd_link_hash_undefweak)
2835 && ((r_type != R_390_PC16
2836 && r_type != R_390_PC12DBL
2837 && r_type != R_390_PC16DBL
2838 && r_type != R_390_PC24DBL
2839 && r_type != R_390_PC32
2840 && r_type != R_390_PC32DBL
2841 && r_type != R_390_PC64)
2842 || !SYMBOL_CALLS_LOCAL (info, h)))
2843 || (ELIMINATE_COPY_RELOCS
2844 && !bfd_link_pic (info)
2845 && h != NULL
2846 && h->dynindx != -1
2847 && !h->non_got_ref
2848 && ((h->def_dynamic
2849 && !h->def_regular)
2850 || h->root.type == bfd_link_hash_undefweak
2851 || h->root.type == bfd_link_hash_undefined)))
2852 {
2853 Elf_Internal_Rela outrel;
2854 bfd_boolean skip, relocate;
2855 asection *sreloc;
2856 bfd_byte *loc;
2857
2858 /* When generating a shared object, these relocations
2859 are copied into the output file to be resolved at run
2860 time. */
2861 skip = FALSE;
2862 relocate = FALSE;
2863
2864 outrel.r_offset =
2865 _bfd_elf_section_offset (output_bfd, info, input_section,
2866 rel->r_offset);
2867 if (outrel.r_offset == (bfd_vma) -1)
2868 skip = TRUE;
2869 else if (outrel.r_offset == (bfd_vma) -2)
2870 skip = TRUE, relocate = TRUE;
2871
2872 outrel.r_offset += (input_section->output_section->vma
2873 + input_section->output_offset);
2874
2875 if (skip)
2876 memset (&outrel, 0, sizeof outrel);
2877 else if (h != NULL
2878 && h->dynindx != -1
2879 && (r_type == R_390_PC16
2880 || r_type == R_390_PC12DBL
2881 || r_type == R_390_PC16DBL
2882 || r_type == R_390_PC24DBL
2883 || r_type == R_390_PC32
2884 || r_type == R_390_PC32DBL
2885 || r_type == R_390_PC64
2886 || !bfd_link_pic (info)
2887 || !SYMBOLIC_BIND (info, h)
2888 || !h->def_regular))
2889 {
2890 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2891 outrel.r_addend = rel->r_addend;
2892 }
2893 else
2894 {
2895 /* This symbol is local, or marked to become local. */
2896 outrel.r_addend = relocation + rel->r_addend;
2897 if (r_type == R_390_64)
2898 {
2899 relocate = TRUE;
2900 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2901 }
2902 else
2903 {
2904 long sindx;
2905
2906 if (bfd_is_abs_section (sec))
2907 sindx = 0;
2908 else if (sec == NULL || sec->owner == NULL)
2909 {
2910 bfd_set_error(bfd_error_bad_value);
2911 return FALSE;
2912 }
2913 else
2914 {
2915 asection *osec;
2916
2917 osec = sec->output_section;
2918 sindx = elf_section_data (osec)->dynindx;
2919
2920 if (sindx == 0)
2921 {
2922 osec = htab->elf.text_index_section;
2923 sindx = elf_section_data (osec)->dynindx;
2924 }
2925 BFD_ASSERT (sindx != 0);
2926
2927 /* We are turning this relocation into one
2928 against a section symbol, so subtract out
2929 the output section's address but not the
2930 offset of the input section in the output
2931 section. */
2932 outrel.r_addend -= osec->vma;
2933 }
2934 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2935 }
2936 }
2937
2938 sreloc = elf_section_data (input_section)->sreloc;
2939 if (sreloc == NULL)
2940 abort ();
2941
2942 loc = sreloc->contents;
2943 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2944 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2945
2946 /* If this reloc is against an external symbol, we do
2947 not want to fiddle with the addend. Otherwise, we
2948 need to include the symbol value so that it becomes
2949 an addend for the dynamic reloc. */
2950 if (! relocate)
2951 continue;
2952 }
2953
2954 break;
2955
2956 /* Relocations for tls literal pool entries. */
2957 case R_390_TLS_IE64:
2958 if (bfd_link_pic (info))
2959 {
2960 Elf_Internal_Rela outrel;
2961 asection *sreloc;
2962 bfd_byte *loc;
2963
2964 outrel.r_offset = rel->r_offset
2965 + input_section->output_section->vma
2966 + input_section->output_offset;
2967 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2968 sreloc = elf_section_data (input_section)->sreloc;
2969 if (sreloc == NULL)
2970 abort ();
2971 loc = sreloc->contents;
2972 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2973 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2974 }
2975 /* Fall through. */
2976
2977 case R_390_TLS_GD64:
2978 case R_390_TLS_GOTIE64:
2979 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2980 tls_type = GOT_UNKNOWN;
2981 if (h == NULL && local_got_offsets)
2982 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2983 else if (h != NULL)
2984 {
2985 tls_type = elf_s390_hash_entry(h)->tls_type;
2986 if (!bfd_link_pic (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2987 r_type = R_390_TLS_LE64;
2988 }
2989 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2990 r_type = R_390_TLS_IE64;
2991
2992 if (r_type == R_390_TLS_LE64)
2993 {
2994 /* This relocation gets optimized away by the local exec
2995 access optimization. */
2996 BFD_ASSERT (! unresolved_reloc);
2997 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2998 contents + rel->r_offset);
2999 continue;
3000 }
3001
3002 if (htab->elf.sgot == NULL)
3003 abort ();
3004
3005 if (h != NULL)
3006 off = h->got.offset;
3007 else
3008 {
3009 if (local_got_offsets == NULL)
3010 abort ();
3011
3012 off = local_got_offsets[r_symndx];
3013 }
3014
3015 emit_tls_relocs:
3016
3017 if ((off & 1) != 0)
3018 off &= ~1;
3019 else
3020 {
3021 Elf_Internal_Rela outrel;
3022 bfd_byte *loc;
3023 int dr_type, indx;
3024
3025 if (htab->elf.srelgot == NULL)
3026 abort ();
3027
3028 outrel.r_offset = (htab->elf.sgot->output_section->vma
3029 + htab->elf.sgot->output_offset + off);
3030
3031 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3032 if (r_type == R_390_TLS_GD64)
3033 dr_type = R_390_TLS_DTPMOD;
3034 else
3035 dr_type = R_390_TLS_TPOFF;
3036 if (dr_type == R_390_TLS_TPOFF && indx == 0)
3037 outrel.r_addend = relocation - dtpoff_base (info);
3038 else
3039 outrel.r_addend = 0;
3040 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3041 loc = htab->elf.srelgot->contents;
3042 loc += htab->elf.srelgot->reloc_count++
3043 * sizeof (Elf64_External_Rela);
3044 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3045
3046 if (r_type == R_390_TLS_GD64)
3047 {
3048 if (indx == 0)
3049 {
3050 BFD_ASSERT (! unresolved_reloc);
3051 bfd_put_64 (output_bfd,
3052 relocation - dtpoff_base (info),
3053 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3054 }
3055 else
3056 {
3057 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
3058 outrel.r_offset += GOT_ENTRY_SIZE;
3059 outrel.r_addend = 0;
3060 htab->elf.srelgot->reloc_count++;
3061 loc += sizeof (Elf64_External_Rela);
3062 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3063 }
3064 }
3065
3066 if (h != NULL)
3067 h->got.offset |= 1;
3068 else
3069 local_got_offsets[r_symndx] |= 1;
3070 }
3071
3072 if (off >= (bfd_vma) -2)
3073 abort ();
3074 if (r_type == ELF64_R_TYPE (rel->r_info))
3075 {
3076 relocation = htab->elf.sgot->output_offset + off;
3077 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
3078 relocation += htab->elf.sgot->output_section->vma;
3079 unresolved_reloc = FALSE;
3080 }
3081 else
3082 {
3083 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
3084 contents + rel->r_offset);
3085 continue;
3086 }
3087 break;
3088
3089 case R_390_TLS_GOTIE12:
3090 case R_390_TLS_GOTIE20:
3091 case R_390_TLS_IEENT:
3092 if (h == NULL)
3093 {
3094 if (local_got_offsets == NULL)
3095 abort();
3096 off = local_got_offsets[r_symndx];
3097 if (bfd_link_pic (info))
3098 goto emit_tls_relocs;
3099 }
3100 else
3101 {
3102 off = h->got.offset;
3103 tls_type = elf_s390_hash_entry(h)->tls_type;
3104 if (bfd_link_pic (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE)
3105 goto emit_tls_relocs;
3106 }
3107
3108 if (htab->elf.sgot == NULL)
3109 abort ();
3110
3111 BFD_ASSERT (! unresolved_reloc);
3112 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3113 htab->elf.sgot->contents + off);
3114 relocation = htab->elf.sgot->output_offset + off;
3115 if (r_type == R_390_TLS_IEENT)
3116 relocation += htab->elf.sgot->output_section->vma;
3117 unresolved_reloc = FALSE;
3118 break;
3119
3120 case R_390_TLS_LDM64:
3121 if (! bfd_link_pic (info))
3122 /* The literal pool entry this relocation refers to gets ignored
3123 by the optimized code of the local exec model. Do nothing
3124 and the value will turn out zero. */
3125 continue;
3126
3127 if (htab->elf.sgot == NULL)
3128 abort ();
3129
3130 off = htab->tls_ldm_got.offset;
3131 if (off & 1)
3132 off &= ~1;
3133 else
3134 {
3135 Elf_Internal_Rela outrel;
3136 bfd_byte *loc;
3137
3138 if (htab->elf.srelgot == NULL)
3139 abort ();
3140
3141 outrel.r_offset = (htab->elf.sgot->output_section->vma
3142 + htab->elf.sgot->output_offset + off);
3143
3144 bfd_put_64 (output_bfd, 0,
3145 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3146 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
3147 outrel.r_addend = 0;
3148 loc = htab->elf.srelgot->contents;
3149 loc += htab->elf.srelgot->reloc_count++
3150 * sizeof (Elf64_External_Rela);
3151 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3152 htab->tls_ldm_got.offset |= 1;
3153 }
3154 relocation = htab->elf.sgot->output_offset + off;
3155 unresolved_reloc = FALSE;
3156 break;
3157
3158 case R_390_TLS_LE64:
3159 if (bfd_link_dll (info))
3160 {
3161 /* Linking a shared library with non-fpic code requires
3162 a R_390_TLS_TPOFF relocation. */
3163 Elf_Internal_Rela outrel;
3164 asection *sreloc;
3165 bfd_byte *loc;
3166 int indx;
3167
3168 outrel.r_offset = rel->r_offset
3169 + input_section->output_section->vma
3170 + input_section->output_offset;
3171 if (h != NULL && h->dynindx != -1)
3172 indx = h->dynindx;
3173 else
3174 indx = 0;
3175 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
3176 if (indx == 0)
3177 outrel.r_addend = relocation - dtpoff_base (info);
3178 else
3179 outrel.r_addend = 0;
3180 sreloc = elf_section_data (input_section)->sreloc;
3181 if (sreloc == NULL)
3182 abort ();
3183 loc = sreloc->contents;
3184 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3185 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3186 }
3187 else
3188 {
3189 BFD_ASSERT (! unresolved_reloc);
3190 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3191 contents + rel->r_offset);
3192 }
3193 continue;
3194
3195 case R_390_TLS_LDO64:
3196 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
3197 relocation -= dtpoff_base (info);
3198 else
3199 /* When converting LDO to LE, we must negate. */
3200 relocation = -tpoff (info, relocation);
3201 break;
3202
3203 /* Relocations for tls instructions. */
3204 case R_390_TLS_LOAD:
3205 case R_390_TLS_GDCALL:
3206 case R_390_TLS_LDCALL:
3207 tls_type = GOT_UNKNOWN;
3208 if (h == NULL && local_got_offsets)
3209 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3210 else if (h != NULL)
3211 tls_type = elf_s390_hash_entry(h)->tls_type;
3212
3213 if (tls_type == GOT_TLS_GD)
3214 continue;
3215
3216 if (r_type == R_390_TLS_LOAD)
3217 {
3218 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3219 {
3220 /* IE->LE transition. Four valid cases:
3221 lg %rx,(0,%ry) -> sllg %rx,%ry,0
3222 lg %rx,(%ry,0) -> sllg %rx,%ry,0
3223 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
3224 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
3225 unsigned int insn0, insn1, ry;
3226
3227 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3228 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3229 if (insn1 != 0x0004)
3230 invalid_tls_insn (input_bfd, input_section, rel);
3231 ry = 0;
3232 if ((insn0 & 0xff00f000) == 0xe3000000)
3233 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
3234 ry = (insn0 & 0x000f0000);
3235 else if ((insn0 & 0xff0f0000) == 0xe3000000)
3236 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
3237 ry = (insn0 & 0x0000f000) << 4;
3238 else if ((insn0 & 0xff00f000) == 0xe300c000)
3239 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
3240 ry = (insn0 & 0x000f0000);
3241 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
3242 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
3243 ry = (insn0 & 0x0000f000) << 4;
3244 else
3245 invalid_tls_insn (input_bfd, input_section, rel);
3246 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
3247 insn1 = 0x000d;
3248 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3249 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3250 }
3251 }
3252 else if (r_type == R_390_TLS_GDCALL)
3253 {
3254 unsigned int insn0, insn1;
3255
3256 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3257 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3258 if ((insn0 & 0xffff0000) != 0xc0e50000)
3259 invalid_tls_insn (input_bfd, input_section, rel);
3260 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3261 {
3262 /* GD->LE transition.
3263 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3264 insn0 = 0xc0040000;
3265 insn1 = 0x0000;
3266 }
3267 else
3268 {
3269 /* GD->IE transition.
3270 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
3271 insn0 = 0xe322c000;
3272 insn1 = 0x0004;
3273 }
3274 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3275 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3276 }
3277 else if (r_type == R_390_TLS_LDCALL)
3278 {
3279 if (!bfd_link_pic (info))
3280 {
3281 unsigned int insn0, insn1;
3282
3283 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3284 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3285 if ((insn0 & 0xffff0000) != 0xc0e50000)
3286 invalid_tls_insn (input_bfd, input_section, rel);
3287 /* LD->LE transition.
3288 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3289 insn0 = 0xc0040000;
3290 insn1 = 0x0000;
3291 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3292 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3293 }
3294 }
3295 continue;
3296
3297 default:
3298 break;
3299 }
3300
3301 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3302 because such sections are not SEC_ALLOC and thus ld.so will
3303 not process them. */
3304 if (unresolved_reloc
3305 && !((input_section->flags & SEC_DEBUGGING) != 0
3306 && h->def_dynamic)
3307 && _bfd_elf_section_offset (output_bfd, info, input_section,
3308 rel->r_offset) != (bfd_vma) -1)
3309 (*_bfd_error_handler)
3310 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3311 input_bfd,
3312 input_section,
3313 (long) rel->r_offset,
3314 howto->name,
3315 h->root.root.string);
3316
3317 do_relocation:
3318
3319 /* When applying a 24 bit reloc we need to start one byte
3320 earlier. Otherwise the 32 bit get/put bfd operations might
3321 access a byte after the actual section. */
3322 if (r_type == R_390_PC24DBL
3323 || r_type == R_390_PLT24DBL)
3324 rel->r_offset--;
3325
3326 if (r_type == R_390_20
3327 || r_type == R_390_GOT20
3328 || r_type == R_390_GOTPLT20
3329 || r_type == R_390_TLS_GOTIE20)
3330 {
3331 relocation += rel->r_addend;
3332 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3333 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3334 contents, rel->r_offset,
3335 relocation, 0);
3336 }
3337 else
3338 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3339 contents, rel->r_offset,
3340 relocation, rel->r_addend);
3341
3342 if (r != bfd_reloc_ok)
3343 {
3344 const char *name;
3345
3346 if (h != NULL)
3347 name = h->root.root.string;
3348 else
3349 {
3350 name = bfd_elf_string_from_elf_section (input_bfd,
3351 symtab_hdr->sh_link,
3352 sym->st_name);
3353 if (name == NULL)
3354 return FALSE;
3355 if (*name == '\0')
3356 name = bfd_section_name (input_bfd, sec);
3357 }
3358
3359 if (r == bfd_reloc_overflow)
3360 (*info->callbacks->reloc_overflow)
3361 (info, (h ? &h->root : NULL), name, howto->name,
3362 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3363 else
3364 {
3365 (*_bfd_error_handler)
3366 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3367 input_bfd, input_section,
3368 (long) rel->r_offset, name, (int) r);
3369 return FALSE;
3370 }
3371 }
3372 }
3373
3374 return TRUE;
3375 }
3376
3377 /* Generate the PLT slots together with the dynamic relocations needed
3378 for IFUNC symbols. */
3379
3380 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)3381 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3382 struct bfd_link_info *info,
3383 struct elf_link_hash_entry *h,
3384 struct elf_s390_link_hash_table *htab,
3385 bfd_vma plt_offset,
3386 bfd_vma resolver_address)
3387 {
3388 bfd_vma plt_index;
3389 bfd_vma got_offset;
3390 Elf_Internal_Rela rela;
3391 bfd_byte *loc;
3392 asection *plt, *gotplt, *relplt;
3393
3394 if (htab->elf.iplt == NULL
3395 || htab->elf.igotplt == NULL
3396 || htab->elf.irelplt == NULL)
3397 abort ();
3398
3399 /* Index of the PLT slot within iplt section. */
3400 plt_index = plt_offset / PLT_ENTRY_SIZE;
3401 plt = htab->elf.iplt;
3402 /* Offset into the igot.plt section. */
3403 got_offset = plt_index * GOT_ENTRY_SIZE;
3404 gotplt = htab->elf.igotplt;
3405 relplt = htab->elf.irelplt;
3406
3407 /* Fill in the blueprint of a PLT. */
3408 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
3409 PLT_ENTRY_SIZE);
3410
3411 /* Fixup the relative address to the GOT entry */
3412 bfd_put_32 (output_bfd,
3413 (gotplt->output_section->vma +
3414 gotplt->output_offset + got_offset
3415 - (plt->output_section->vma +
3416 plt->output_offset +
3417 plt_offset))/2,
3418 plt->contents + plt_offset + 2);
3419 /* Fixup the relative branch to PLT 0 */
3420 bfd_put_32 (output_bfd, - (plt->output_offset +
3421 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3422 plt->contents + plt_offset + 24);
3423 /* Fixup offset into .rela.plt section. */
3424 bfd_put_32 (output_bfd, relplt->output_offset +
3425 plt_index * sizeof (Elf64_External_Rela),
3426 plt->contents + plt_offset + 28);
3427
3428 /* Fill in the entry in the global offset table.
3429 Points to instruction after GOT offset. */
3430 bfd_put_64 (output_bfd,
3431 (plt->output_section->vma
3432 + plt->output_offset
3433 + plt_offset
3434 + 14),
3435 gotplt->contents + got_offset);
3436
3437 /* Fill in the entry in the .rela.plt section. */
3438 rela.r_offset = (gotplt->output_section->vma
3439 + gotplt->output_offset
3440 + got_offset);
3441
3442 if (!h
3443 || h->dynindx == -1
3444 || ((bfd_link_executable (info)
3445 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3446 && h->def_regular))
3447 {
3448 /* The symbol can be locally resolved. */
3449 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
3450 rela.r_addend = resolver_address;
3451 }
3452 else
3453 {
3454 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3455 rela.r_addend = 0;
3456 }
3457
3458 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3459 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3460 }
3461
3462
3463 /* Finish up dynamic symbol handling. We set the contents of various
3464 dynamic sections here. */
3465
3466 static bfd_boolean
elf_s390_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)3467 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3468 struct bfd_link_info *info,
3469 struct elf_link_hash_entry *h,
3470 Elf_Internal_Sym *sym)
3471 {
3472 struct elf_s390_link_hash_table *htab;
3473 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3474
3475 htab = elf_s390_hash_table (info);
3476 if (htab == NULL)
3477 return FALSE;
3478
3479 if (h->plt.offset != (bfd_vma) -1)
3480 {
3481 bfd_vma plt_index;
3482 bfd_vma got_offset;
3483 Elf_Internal_Rela rela;
3484 bfd_byte *loc;
3485
3486 /* This symbol has an entry in the procedure linkage table. Set
3487 it up. */
3488 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3489 {
3490 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3491 htab, h->plt.offset,
3492 eh->ifunc_resolver_address +
3493 eh->ifunc_resolver_section->output_offset +
3494 eh->ifunc_resolver_section->output_section->vma);
3495
3496 /* Do not return yet. Handling of explicit GOT slots of
3497 IFUNC symbols is below. */
3498 }
3499 else
3500 {
3501 if (h->dynindx == -1
3502 || htab->elf.splt == NULL
3503 || htab->elf.sgotplt == NULL
3504 || htab->elf.srelplt == NULL)
3505 abort ();
3506
3507 /* Calc. index no.
3508 Current offset - size first entry / entry size. */
3509 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3510
3511 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3512 addr & GOT addr. */
3513 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3514
3515 /* Fill in the blueprint of a PLT. */
3516 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
3517 PLT_ENTRY_SIZE);
3518
3519 /* Fixup the relative address to the GOT entry */
3520 bfd_put_32 (output_bfd,
3521 (htab->elf.sgotplt->output_section->vma +
3522 htab->elf.sgotplt->output_offset + got_offset
3523 - (htab->elf.splt->output_section->vma +
3524 htab->elf.splt->output_offset +
3525 h->plt.offset))/2,
3526 htab->elf.splt->contents + h->plt.offset + 2);
3527 /* Fixup the relative branch to PLT 0 */
3528 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3529 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3530 htab->elf.splt->contents + h->plt.offset + 24);
3531 /* Fixup offset into .rela.plt section. */
3532 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3533 htab->elf.splt->contents + h->plt.offset + 28);
3534
3535 /* Fill in the entry in the global offset table.
3536 Points to instruction after GOT offset. */
3537 bfd_put_64 (output_bfd,
3538 (htab->elf.splt->output_section->vma
3539 + htab->elf.splt->output_offset
3540 + h->plt.offset
3541 + 14),
3542 htab->elf.sgotplt->contents + got_offset);
3543
3544 /* Fill in the entry in the .rela.plt section. */
3545 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3546 + htab->elf.sgotplt->output_offset
3547 + got_offset);
3548 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3549 rela.r_addend = 0;
3550 loc = htab->elf.srelplt->contents + plt_index *
3551 sizeof (Elf64_External_Rela);
3552 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3553
3554 if (!h->def_regular)
3555 {
3556 /* Mark the symbol as undefined, rather than as defined in
3557 the .plt section. Leave the value alone. This is a clue
3558 for the dynamic linker, to make function pointer
3559 comparisons work between an application and shared
3560 library. */
3561 sym->st_shndx = SHN_UNDEF;
3562 }
3563 }
3564 }
3565
3566 if (h->got.offset != (bfd_vma) -1
3567 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3568 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3569 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3570 {
3571 Elf_Internal_Rela rela;
3572 bfd_byte *loc;
3573
3574 /* This symbol has an entry in the global offset table. Set it
3575 up. */
3576 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3577 abort ();
3578
3579 rela.r_offset = (htab->elf.sgot->output_section->vma
3580 + htab->elf.sgot->output_offset
3581 + (h->got.offset &~ (bfd_vma) 1));
3582
3583 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3584 {
3585 if (bfd_link_pic (info))
3586 {
3587 /* An explicit GOT slot usage needs GLOB_DAT. If the
3588 symbol references local the implicit got.iplt slot
3589 will be used and the IRELATIVE reloc has been created
3590 above. */
3591 goto do_glob_dat;
3592 }
3593 else
3594 {
3595 /* For non-shared objects explicit GOT slots must be
3596 filled with the PLT slot address for pointer
3597 equality reasons. */
3598 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
3599 + htab->elf.iplt->output_offset
3600 + h->plt.offset),
3601 htab->elf.sgot->contents + h->got.offset);
3602 return TRUE;
3603 }
3604 }
3605 else if (bfd_link_pic (info)
3606 && SYMBOL_REFERENCES_LOCAL (info, h))
3607 {
3608 /* If this is a static link, or it is a -Bsymbolic link and
3609 the symbol is defined locally or was forced to be local
3610 because of a version file, we just want to emit a
3611 RELATIVE reloc. The entry in the global offset table
3612 will already have been initialized in the
3613 relocate_section function. */
3614 if (!h->def_regular)
3615 return FALSE;
3616 BFD_ASSERT((h->got.offset & 1) != 0);
3617 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3618 rela.r_addend = (h->root.u.def.value
3619 + h->root.u.def.section->output_section->vma
3620 + h->root.u.def.section->output_offset);
3621 }
3622 else
3623 {
3624 BFD_ASSERT((h->got.offset & 1) == 0);
3625 do_glob_dat:
3626 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3627 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3628 rela.r_addend = 0;
3629 }
3630
3631 loc = htab->elf.srelgot->contents;
3632 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3633 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3634 }
3635
3636 if (h->needs_copy)
3637 {
3638 Elf_Internal_Rela rela;
3639 bfd_byte *loc;
3640
3641 /* This symbols needs a copy reloc. Set it up. */
3642
3643 if (h->dynindx == -1
3644 || (h->root.type != bfd_link_hash_defined
3645 && h->root.type != bfd_link_hash_defweak)
3646 || htab->srelbss == NULL)
3647 abort ();
3648
3649 rela.r_offset = (h->root.u.def.value
3650 + h->root.u.def.section->output_section->vma
3651 + h->root.u.def.section->output_offset);
3652 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3653 rela.r_addend = 0;
3654 loc = htab->srelbss->contents;
3655 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3656 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3657 }
3658
3659 /* Mark some specially defined symbols as absolute. */
3660 if (h == htab->elf.hdynamic
3661 || h == htab->elf.hgot
3662 || h == htab->elf.hplt)
3663 sym->st_shndx = SHN_ABS;
3664
3665 return TRUE;
3666 }
3667
3668 /* Used to decide how to sort relocs in an optimal manner for the
3669 dynamic linker, before writing them out. */
3670
3671 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)3672 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3673 const asection *rel_sec ATTRIBUTE_UNUSED,
3674 const Elf_Internal_Rela *rela)
3675 {
3676 bfd *abfd = info->output_bfd;
3677 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3678 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3679 unsigned long r_symndx = ELF64_R_SYM (rela->r_info);
3680 Elf_Internal_Sym sym;
3681
3682 if (htab->elf.dynsym == NULL
3683 || !bed->s->swap_symbol_in (abfd,
3684 (htab->elf.dynsym->contents
3685 + r_symndx * bed->s->sizeof_sym),
3686 0, &sym))
3687 abort ();
3688
3689 /* Check relocation against STT_GNU_IFUNC symbol. */
3690 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3691 return reloc_class_ifunc;
3692
3693 switch ((int) ELF64_R_TYPE (rela->r_info))
3694 {
3695 case R_390_RELATIVE:
3696 return reloc_class_relative;
3697 case R_390_JMP_SLOT:
3698 return reloc_class_plt;
3699 case R_390_COPY:
3700 return reloc_class_copy;
3701 default:
3702 return reloc_class_normal;
3703 }
3704 }
3705
3706 /* Finish up the dynamic sections. */
3707
3708 static bfd_boolean
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3709 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3710 struct bfd_link_info *info)
3711 {
3712 struct elf_s390_link_hash_table *htab;
3713 bfd *dynobj;
3714 asection *sdyn;
3715 bfd *ibfd;
3716 unsigned int i;
3717
3718 htab = elf_s390_hash_table (info);
3719 if (htab == NULL)
3720 return FALSE;
3721
3722 dynobj = htab->elf.dynobj;
3723 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3724
3725 if (htab->elf.dynamic_sections_created)
3726 {
3727 Elf64_External_Dyn *dyncon, *dynconend;
3728
3729 if (sdyn == NULL || htab->elf.sgot == NULL)
3730 abort ();
3731
3732 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3733 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3734 for (; dyncon < dynconend; dyncon++)
3735 {
3736 Elf_Internal_Dyn dyn;
3737 asection *s;
3738
3739 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3740
3741 switch (dyn.d_tag)
3742 {
3743 default:
3744 continue;
3745
3746 case DT_PLTGOT:
3747 s = htab->elf.sgotplt;
3748 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3749 break;
3750
3751 case DT_JMPREL:
3752 s = htab->elf.srelplt;
3753 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3754 break;
3755
3756 case DT_PLTRELSZ:
3757 dyn.d_un.d_val = htab->elf.srelplt->size + htab->elf.irelplt->size;
3758 break;
3759
3760 case DT_RELASZ:
3761 /* The procedure linkage table relocs (DT_JMPREL) should
3762 not be included in the overall relocs (DT_RELA).
3763 Therefore, we override the DT_RELASZ entry here to
3764 make it not include the JMPREL relocs. Since the
3765 linker script arranges for .rela.plt to follow all
3766 other relocation sections, we don't have to worry
3767 about changing the DT_RELA entry. */
3768 dyn.d_un.d_val -= htab->elf.srelplt->size + htab->elf.irelplt->size;
3769 break;
3770 }
3771
3772 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3773 }
3774
3775 /* Fill in the special first entry in the procedure linkage table. */
3776 if (htab->elf.splt && htab->elf.splt->size > 0)
3777 {
3778 /* fill in blueprint for plt 0 entry */
3779 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
3780 PLT_FIRST_ENTRY_SIZE);
3781 /* Fixup relative address to start of GOT */
3782 bfd_put_32 (output_bfd,
3783 (htab->elf.sgotplt->output_section->vma
3784 + htab->elf.sgotplt->output_offset
3785 - htab->elf.splt->output_section->vma
3786 - htab->elf.splt->output_offset - 6)/2,
3787 htab->elf.splt->contents + 8);
3788 }
3789 if (elf_section_data (htab->elf.splt->output_section) != NULL)
3790 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
3791 = PLT_ENTRY_SIZE;
3792 }
3793
3794 if (htab->elf.sgotplt)
3795 {
3796 /* Fill in the first three entries in the global offset table. */
3797 if (htab->elf.sgotplt->size > 0)
3798 {
3799 bfd_put_64 (output_bfd,
3800 (sdyn == NULL ? (bfd_vma) 0
3801 : sdyn->output_section->vma + sdyn->output_offset),
3802 htab->elf.sgotplt->contents);
3803 /* One entry for shared object struct ptr. */
3804 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3805 /* One entry for _dl_runtime_resolve. */
3806 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 16);
3807 }
3808
3809 elf_section_data (htab->elf.sgot->output_section)
3810 ->this_hdr.sh_entsize = 8;
3811 }
3812
3813 /* Finish dynamic symbol for local IFUNC symbols. */
3814 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3815 {
3816 struct plt_entry *local_plt;
3817 Elf_Internal_Sym *isym;
3818 Elf_Internal_Shdr *symtab_hdr;
3819
3820 symtab_hdr = &elf_symtab_hdr (ibfd);
3821
3822 local_plt = elf_s390_local_plt (ibfd);
3823 if (local_plt != NULL)
3824 for (i = 0; i < symtab_hdr->sh_info; i++)
3825 {
3826 if (local_plt[i].plt.offset != (bfd_vma) -1)
3827 {
3828 asection *sec = local_plt[i].sec;
3829 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3830 if (isym == NULL)
3831 return FALSE;
3832
3833 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3834 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3835 local_plt[i].plt.offset,
3836 isym->st_value
3837 + sec->output_section->vma
3838 + sec->output_offset);
3839
3840 }
3841 }
3842 }
3843
3844 return TRUE;
3845 }
3846
3847 /* Return address for Ith PLT stub in section PLT, for relocation REL
3848 or (bfd_vma) -1 if it should not be included. */
3849
3850 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3851 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3852 const arelent *rel ATTRIBUTE_UNUSED)
3853 {
3854 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3855 }
3856
3857 /* Merge backend specific data from an object file to the output
3858 object file when linking. */
3859
3860 static bfd_boolean
elf64_s390_merge_private_bfd_data(bfd * ibfd,bfd * obfd)3861 elf64_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3862 {
3863 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
3864 return TRUE;
3865
3866 if (!elf_s390_merge_obj_attributes (ibfd, obfd))
3867 return FALSE;
3868
3869 return TRUE;
3870 }
3871
3872 /* Why was the hash table entry size definition changed from
3873 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3874 this is the only reason for the s390_elf64_size_info structure. */
3875
3876 const struct elf_size_info s390_elf64_size_info =
3877 {
3878 sizeof (Elf64_External_Ehdr),
3879 sizeof (Elf64_External_Phdr),
3880 sizeof (Elf64_External_Shdr),
3881 sizeof (Elf64_External_Rel),
3882 sizeof (Elf64_External_Rela),
3883 sizeof (Elf64_External_Sym),
3884 sizeof (Elf64_External_Dyn),
3885 sizeof (Elf_External_Note),
3886 8, /* hash-table entry size. */
3887 1, /* internal relocations per external relocations. */
3888 64, /* arch_size. */
3889 3, /* log_file_align. */
3890 ELFCLASS64, EV_CURRENT,
3891 bfd_elf64_write_out_phdrs,
3892 bfd_elf64_write_shdrs_and_ehdr,
3893 bfd_elf64_checksum_contents,
3894 bfd_elf64_write_relocs,
3895 bfd_elf64_swap_symbol_in,
3896 bfd_elf64_swap_symbol_out,
3897 bfd_elf64_slurp_reloc_table,
3898 bfd_elf64_slurp_symbol_table,
3899 bfd_elf64_swap_dyn_in,
3900 bfd_elf64_swap_dyn_out,
3901 bfd_elf64_swap_reloc_in,
3902 bfd_elf64_swap_reloc_out,
3903 bfd_elf64_swap_reloca_in,
3904 bfd_elf64_swap_reloca_out
3905 };
3906
3907 #define TARGET_BIG_SYM s390_elf64_vec
3908 #define TARGET_BIG_NAME "elf64-s390"
3909 #define ELF_ARCH bfd_arch_s390
3910 #define ELF_TARGET_ID S390_ELF_DATA
3911 #define ELF_MACHINE_CODE EM_S390
3912 #define ELF_MACHINE_ALT1 EM_S390_OLD
3913 #define ELF_MAXPAGESIZE 0x1000
3914
3915 #define elf_backend_size_info s390_elf64_size_info
3916
3917 #define elf_backend_can_gc_sections 1
3918 #define elf_backend_can_refcount 1
3919 #define elf_backend_want_got_plt 1
3920 #define elf_backend_plt_readonly 1
3921 #define elf_backend_want_plt_sym 0
3922 #define elf_backend_got_header_size 24
3923 #define elf_backend_rela_normal 1
3924
3925 #define elf_info_to_howto elf_s390_info_to_howto
3926
3927 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3928 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3929 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3930 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3931 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data
3932
3933 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3934 #define elf_backend_check_relocs elf_s390_check_relocs
3935 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3936 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3937 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3938 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3939 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3940 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3941 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3942 #define elf_backend_relocate_section elf_s390_relocate_section
3943 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3944 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3945 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3946 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
3947 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
3948
3949 #define bfd_elf64_mkobject elf_s390_mkobject
3950 #define elf_backend_object_p elf_s390_object_p
3951
3952 #include "elf64-target.h"
3953