1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright (C) 2000-2014 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 0, /* 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 24(15) = Pointer to the structure describing the object.
496 28(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 (!info->shared)
779 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
780
781 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
782 || (!info->shared && !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 (info->shared)
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 (info->relocatable)
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_GOTOFF16:
1044 case R_390_GOTOFF32:
1045 case R_390_GOTOFF64:
1046 case R_390_GOTPC:
1047 case R_390_GOTPCDBL:
1048 /* These relocs do not need a GOT slot. They just load the
1049 GOT pointer itself or address something else relative to
1050 the GOT. Since the GOT pointer has been set up above we
1051 are done. */
1052 break;
1053
1054 case R_390_PLT12DBL:
1055 case R_390_PLT16DBL:
1056 case R_390_PLT24DBL:
1057 case R_390_PLT32:
1058 case R_390_PLT32DBL:
1059 case R_390_PLT64:
1060 case R_390_PLTOFF16:
1061 case R_390_PLTOFF32:
1062 case R_390_PLTOFF64:
1063 /* This symbol requires a procedure linkage table entry. We
1064 actually build the entry in adjust_dynamic_symbol,
1065 because this might be a case of linking PIC code which is
1066 never referenced by a dynamic object, in which case we
1067 don't need to generate a procedure linkage table entry
1068 after all. */
1069
1070 /* If this is a local symbol, we resolve it directly without
1071 creating a procedure linkage table entry. */
1072 if (h != NULL)
1073 {
1074 h->needs_plt = 1;
1075 h->plt.refcount += 1;
1076 }
1077 break;
1078
1079 case R_390_GOTPLT12:
1080 case R_390_GOTPLT16:
1081 case R_390_GOTPLT20:
1082 case R_390_GOTPLT32:
1083 case R_390_GOTPLT64:
1084 case R_390_GOTPLTENT:
1085 /* This symbol requires either a procedure linkage table entry
1086 or an entry in the local got. We actually build the entry
1087 in adjust_dynamic_symbol because whether this is really a
1088 global reference can change and with it the fact if we have
1089 to create a plt entry or a local got entry. To be able to
1090 make a once global symbol a local one we have to keep track
1091 of the number of gotplt references that exist for this
1092 symbol. */
1093 if (h != NULL)
1094 {
1095 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1096 h->needs_plt = 1;
1097 h->plt.refcount += 1;
1098 }
1099 else
1100 local_got_refcounts[r_symndx] += 1;
1101 break;
1102
1103 case R_390_TLS_LDM64:
1104 htab->tls_ldm_got.refcount += 1;
1105 break;
1106
1107 case R_390_TLS_IE64:
1108 case R_390_TLS_GOTIE12:
1109 case R_390_TLS_GOTIE20:
1110 case R_390_TLS_GOTIE64:
1111 case R_390_TLS_IEENT:
1112 if (info->shared)
1113 info->flags |= DF_STATIC_TLS;
1114 /* Fall through */
1115
1116 case R_390_GOT12:
1117 case R_390_GOT16:
1118 case R_390_GOT20:
1119 case R_390_GOT32:
1120 case R_390_GOT64:
1121 case R_390_GOTENT:
1122 case R_390_TLS_GD64:
1123 /* This symbol requires a global offset table entry. */
1124 switch (r_type)
1125 {
1126 default:
1127 case R_390_GOT12:
1128 case R_390_GOT16:
1129 case R_390_GOT20:
1130 case R_390_GOT32:
1131 case R_390_GOTENT:
1132 tls_type = GOT_NORMAL;
1133 break;
1134 case R_390_TLS_GD64:
1135 tls_type = GOT_TLS_GD;
1136 break;
1137 case R_390_TLS_IE64:
1138 case R_390_TLS_GOTIE64:
1139 tls_type = GOT_TLS_IE;
1140 break;
1141 case R_390_TLS_GOTIE12:
1142 case R_390_TLS_GOTIE20:
1143 case R_390_TLS_IEENT:
1144 tls_type = GOT_TLS_IE_NLT;
1145 break;
1146 }
1147
1148 if (h != NULL)
1149 {
1150 h->got.refcount += 1;
1151 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1152 }
1153 else
1154 {
1155 local_got_refcounts[r_symndx] += 1;
1156 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1157 }
1158 /* If a TLS symbol is accessed using IE at least once,
1159 there is no point to use dynamic model for it. */
1160 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1161 {
1162 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1163 {
1164 (*_bfd_error_handler)
1165 (_("%B: `%s' accessed both as normal and thread local symbol"),
1166 abfd, h->root.root.string);
1167 return FALSE;
1168 }
1169 if (old_tls_type > tls_type)
1170 tls_type = old_tls_type;
1171 }
1172
1173 if (old_tls_type != tls_type)
1174 {
1175 if (h != NULL)
1176 elf_s390_hash_entry (h)->tls_type = tls_type;
1177 else
1178 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1179 }
1180
1181 if (r_type != R_390_TLS_IE64)
1182 break;
1183 /* Fall through */
1184
1185 case R_390_TLS_LE64:
1186 /* For static linking and executables this reloc will be
1187 calculated at linktime otherwise a TLS_TPOFF runtime
1188 reloc will be generated. */
1189 if (r_type == R_390_TLS_LE64 && info->pie)
1190 break;
1191
1192 if (!info->shared)
1193 break;
1194 info->flags |= DF_STATIC_TLS;
1195 /* Fall through */
1196
1197 case R_390_8:
1198 case R_390_16:
1199 case R_390_32:
1200 case R_390_64:
1201 case R_390_PC12DBL:
1202 case R_390_PC16:
1203 case R_390_PC16DBL:
1204 case R_390_PC24DBL:
1205 case R_390_PC32:
1206 case R_390_PC32DBL:
1207 case R_390_PC64:
1208 if (h != NULL)
1209 {
1210 /* If this reloc is in a read-only section, we might
1211 need a copy reloc. We can't check reliably at this
1212 stage whether the section is read-only, as input
1213 sections have not yet been mapped to output sections.
1214 Tentatively set the flag for now, and correct in
1215 adjust_dynamic_symbol. */
1216 h->non_got_ref = 1;
1217
1218 if (!info->shared)
1219 {
1220 /* We may need a .plt entry if the function this reloc
1221 refers to is in a shared lib. */
1222 h->plt.refcount += 1;
1223 }
1224 }
1225
1226 /* If we are creating a shared library, and this is a reloc
1227 against a global symbol, or a non PC relative reloc
1228 against a local symbol, then we need to copy the reloc
1229 into the shared library. However, if we are linking with
1230 -Bsymbolic, we do not need to copy a reloc against a
1231 global symbol which is defined in an object we are
1232 including in the link (i.e., DEF_REGULAR is set). At
1233 this point we have not seen all the input files, so it is
1234 possible that DEF_REGULAR is not set now but will be set
1235 later (it is never cleared). In case of a weak definition,
1236 DEF_REGULAR may be cleared later by a strong definition in
1237 a shared library. We account for that possibility below by
1238 storing information in the relocs_copied field of the hash
1239 table entry. A similar situation occurs when creating
1240 shared libraries and symbol visibility changes render the
1241 symbol local.
1242
1243 If on the other hand, we are creating an executable, we
1244 may need to keep relocations for symbols satisfied by a
1245 dynamic library if we manage to avoid copy relocs for the
1246 symbol. */
1247 if ((info->shared
1248 && (sec->flags & SEC_ALLOC) != 0
1249 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1250 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL
1251 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1252 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL
1253 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1254 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1255 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1256 || (h != NULL
1257 && (! SYMBOLIC_BIND (info, h)
1258 || h->root.type == bfd_link_hash_defweak
1259 || !h->def_regular))))
1260 || (ELIMINATE_COPY_RELOCS
1261 && !info->shared
1262 && (sec->flags & SEC_ALLOC) != 0
1263 && h != NULL
1264 && (h->root.type == bfd_link_hash_defweak
1265 || !h->def_regular)))
1266 {
1267 struct elf_dyn_relocs *p;
1268 struct elf_dyn_relocs **head;
1269
1270 /* We must copy these reloc types into the output file.
1271 Create a reloc section in dynobj and make room for
1272 this reloc. */
1273 if (sreloc == NULL)
1274 {
1275 if (htab->elf.dynobj == NULL)
1276 htab->elf.dynobj = abfd;
1277
1278 sreloc = _bfd_elf_make_dynamic_reloc_section
1279 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1280
1281 if (sreloc == NULL)
1282 return FALSE;
1283 }
1284
1285 /* If this is a global symbol, we count the number of
1286 relocations we need for this symbol. */
1287 if (h != NULL)
1288 {
1289 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1290 }
1291 else
1292 {
1293 /* Track dynamic relocs needed for local syms too.
1294 We really need local syms available to do this
1295 easily. Oh well. */
1296 asection *s;
1297 void *vpp;
1298
1299 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1300 abfd, r_symndx);
1301 if (isym == NULL)
1302 return FALSE;
1303
1304 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1305 if (s == NULL)
1306 s = sec;
1307
1308 vpp = &elf_section_data (s)->local_dynrel;
1309 head = (struct elf_dyn_relocs **) vpp;
1310 }
1311
1312 p = *head;
1313 if (p == NULL || p->sec != sec)
1314 {
1315 bfd_size_type amt = sizeof *p;
1316 p = ((struct elf_dyn_relocs *)
1317 bfd_alloc (htab->elf.dynobj, amt));
1318 if (p == NULL)
1319 return FALSE;
1320 p->next = *head;
1321 *head = p;
1322 p->sec = sec;
1323 p->count = 0;
1324 p->pc_count = 0;
1325 }
1326
1327 p->count += 1;
1328 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1329 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL
1330 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1331 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1332 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1333 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1334 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1335 p->pc_count += 1;
1336 }
1337 break;
1338
1339 /* This relocation describes the C++ object vtable hierarchy.
1340 Reconstruct it for later use during GC. */
1341 case R_390_GNU_VTINHERIT:
1342 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1343 return FALSE;
1344 break;
1345
1346 /* This relocation describes which C++ vtable entries are actually
1347 used. Record for later use during GC. */
1348 case R_390_GNU_VTENTRY:
1349 BFD_ASSERT (h != NULL);
1350 if (h != NULL
1351 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1352 return FALSE;
1353 break;
1354
1355 default:
1356 break;
1357 }
1358 }
1359
1360 return TRUE;
1361 }
1362
1363 /* Return the section that should be marked against GC for a given
1364 relocation. */
1365
1366 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)1367 elf_s390_gc_mark_hook (asection *sec,
1368 struct bfd_link_info *info,
1369 Elf_Internal_Rela *rel,
1370 struct elf_link_hash_entry *h,
1371 Elf_Internal_Sym *sym)
1372 {
1373 if (h != NULL)
1374 switch (ELF64_R_TYPE (rel->r_info))
1375 {
1376 case R_390_GNU_VTINHERIT:
1377 case R_390_GNU_VTENTRY:
1378 return NULL;
1379 }
1380
1381 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1382 }
1383
1384 /* Update the got entry reference counts for the section being removed. */
1385
1386 static bfd_boolean
elf_s390_gc_sweep_hook(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)1387 elf_s390_gc_sweep_hook (bfd *abfd,
1388 struct bfd_link_info *info,
1389 asection *sec,
1390 const Elf_Internal_Rela *relocs)
1391 {
1392 struct elf_s390_link_hash_table *htab;
1393 Elf_Internal_Shdr *symtab_hdr;
1394 struct elf_link_hash_entry **sym_hashes;
1395 bfd_signed_vma *local_got_refcounts;
1396 const Elf_Internal_Rela *rel, *relend;
1397
1398 if (info->relocatable)
1399 return TRUE;
1400
1401 htab = elf_s390_hash_table (info);
1402 if (htab == NULL)
1403 return FALSE;
1404
1405 elf_section_data (sec)->local_dynrel = NULL;
1406
1407 symtab_hdr = &elf_symtab_hdr (abfd);
1408 sym_hashes = elf_sym_hashes (abfd);
1409 local_got_refcounts = elf_local_got_refcounts (abfd);
1410
1411 relend = relocs + sec->reloc_count;
1412 for (rel = relocs; rel < relend; rel++)
1413 {
1414 unsigned long r_symndx;
1415 unsigned int r_type;
1416 struct elf_link_hash_entry *h = NULL;
1417
1418 r_symndx = ELF64_R_SYM (rel->r_info);
1419 if (r_symndx >= symtab_hdr->sh_info)
1420 {
1421 struct elf_s390_link_hash_entry *eh;
1422 struct elf_dyn_relocs **pp;
1423 struct elf_dyn_relocs *p;
1424
1425 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1426 while (h->root.type == bfd_link_hash_indirect
1427 || h->root.type == bfd_link_hash_warning)
1428 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1429 eh = (struct elf_s390_link_hash_entry *) h;
1430
1431 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1432 if (p->sec == sec)
1433 {
1434 /* Everything must go for SEC. */
1435 *pp = p->next;
1436 break;
1437 }
1438 }
1439 else
1440 {
1441 Elf_Internal_Sym *isym;
1442
1443 /* A local symbol. */
1444 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1445 abfd, r_symndx);
1446 if (isym == NULL)
1447 return FALSE;
1448
1449 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1450 {
1451 struct plt_entry *plt = elf_s390_local_plt (abfd);
1452 if (plt[r_symndx].plt.refcount > 0)
1453 plt[r_symndx].plt.refcount--;
1454 }
1455 }
1456
1457 r_type = ELF64_R_TYPE (rel->r_info);
1458 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1459 switch (r_type)
1460 {
1461 case R_390_TLS_LDM64:
1462 if (htab->tls_ldm_got.refcount > 0)
1463 htab->tls_ldm_got.refcount -= 1;
1464 break;
1465
1466 case R_390_TLS_GD64:
1467 case R_390_TLS_IE64:
1468 case R_390_TLS_GOTIE12:
1469 case R_390_TLS_GOTIE20:
1470 case R_390_TLS_GOTIE64:
1471 case R_390_TLS_IEENT:
1472 case R_390_GOT12:
1473 case R_390_GOT16:
1474 case R_390_GOT20:
1475 case R_390_GOT32:
1476 case R_390_GOT64:
1477 case R_390_GOTOFF16:
1478 case R_390_GOTOFF32:
1479 case R_390_GOTOFF64:
1480 case R_390_GOTPC:
1481 case R_390_GOTPCDBL:
1482 case R_390_GOTENT:
1483 if (h != NULL)
1484 {
1485 if (h->got.refcount > 0)
1486 h->got.refcount -= 1;
1487 }
1488 else if (local_got_refcounts != NULL)
1489 {
1490 if (local_got_refcounts[r_symndx] > 0)
1491 local_got_refcounts[r_symndx] -= 1;
1492 }
1493 break;
1494
1495 case R_390_8:
1496 case R_390_12:
1497 case R_390_16:
1498 case R_390_20:
1499 case R_390_32:
1500 case R_390_64:
1501 case R_390_PC16:
1502 case R_390_PC12DBL:
1503 case R_390_PC16DBL:
1504 case R_390_PC24DBL:
1505 case R_390_PC32:
1506 case R_390_PC32DBL:
1507 case R_390_PC64:
1508 if (info->shared)
1509 break;
1510 /* Fall through */
1511
1512 case R_390_PLT12DBL:
1513 case R_390_PLT16DBL:
1514 case R_390_PLT24DBL:
1515 case R_390_PLT32:
1516 case R_390_PLT32DBL:
1517 case R_390_PLT64:
1518 case R_390_PLTOFF16:
1519 case R_390_PLTOFF32:
1520 case R_390_PLTOFF64:
1521 if (h != NULL)
1522 {
1523 if (h->plt.refcount > 0)
1524 h->plt.refcount -= 1;
1525 }
1526 break;
1527
1528 case R_390_GOTPLT12:
1529 case R_390_GOTPLT16:
1530 case R_390_GOTPLT20:
1531 case R_390_GOTPLT32:
1532 case R_390_GOTPLT64:
1533 case R_390_GOTPLTENT:
1534 if (h != NULL)
1535 {
1536 if (h->plt.refcount > 0)
1537 {
1538 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1539 h->plt.refcount -= 1;
1540 }
1541 }
1542 else if (local_got_refcounts != NULL)
1543 {
1544 if (local_got_refcounts[r_symndx] > 0)
1545 local_got_refcounts[r_symndx] -= 1;
1546 }
1547 break;
1548
1549 default:
1550 break;
1551 }
1552 }
1553
1554 return TRUE;
1555 }
1556
1557 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1558 entry but we found we will not create any. Called when we find we will
1559 not have any PLT for this symbol, by for example
1560 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1561 or elf_s390_size_dynamic_sections if no dynamic sections will be
1562 created (we're only linking static objects). */
1563
1564 static void
elf_s390_adjust_gotplt(struct elf_s390_link_hash_entry * h)1565 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1566 {
1567 if (h->elf.root.type == bfd_link_hash_warning)
1568 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1569
1570 if (h->gotplt_refcount <= 0)
1571 return;
1572
1573 /* We simply add the number of gotplt references to the number
1574 * of got references for this symbol. */
1575 h->elf.got.refcount += h->gotplt_refcount;
1576 h->gotplt_refcount = -1;
1577 }
1578
1579 /* Adjust a symbol defined by a dynamic object and referenced by a
1580 regular object. The current definition is in some section of the
1581 dynamic object, but we're not including those sections. We have to
1582 change the definition to something the rest of the link can
1583 understand. */
1584
1585 static bfd_boolean
elf_s390_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)1586 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1587 struct elf_link_hash_entry *h)
1588 {
1589 struct elf_s390_link_hash_table *htab;
1590 asection *s;
1591
1592 /* STT_GNU_IFUNC symbol must go through PLT. */
1593 if (s390_is_ifunc_symbol_p (h))
1594 return TRUE;
1595
1596 /* If this is a function, put it in the procedure linkage table. We
1597 will fill in the contents of the procedure linkage table later
1598 (although we could actually do it here). */
1599 if (h->type == STT_FUNC
1600 || h->needs_plt)
1601 {
1602 if (h->plt.refcount <= 0
1603 || SYMBOL_CALLS_LOCAL (info, h)
1604 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1605 && h->root.type == bfd_link_hash_undefweak))
1606 {
1607 /* This case can occur if we saw a PLT32 reloc in an input
1608 file, but the symbol was never referred to by a dynamic
1609 object, or if all references were garbage collected. In
1610 such a case, we don't actually need to build a procedure
1611 linkage table, and we can just do a PC32 reloc instead. */
1612 h->plt.offset = (bfd_vma) -1;
1613 h->needs_plt = 0;
1614 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1615 }
1616
1617 return TRUE;
1618 }
1619 else
1620 /* It's possible that we incorrectly decided a .plt reloc was
1621 needed for an R_390_PC32 reloc to a non-function sym in
1622 check_relocs. We can't decide accurately between function and
1623 non-function syms in check-relocs; Objects loaded later in
1624 the link may change h->type. So fix it now. */
1625 h->plt.offset = (bfd_vma) -1;
1626
1627 /* If this is a weak symbol, and there is a real definition, the
1628 processor independent code will have arranged for us to see the
1629 real definition first, and we can just use the same value. */
1630 if (h->u.weakdef != NULL)
1631 {
1632 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1633 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1634 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1635 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1636 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1637 h->non_got_ref = h->u.weakdef->non_got_ref;
1638 return TRUE;
1639 }
1640
1641 /* This is a reference to a symbol defined by a dynamic object which
1642 is not a function. */
1643
1644 /* If we are creating a shared library, we must presume that the
1645 only references to the symbol are via the global offset table.
1646 For such cases we need not do anything here; the relocations will
1647 be handled correctly by relocate_section. */
1648 if (info->shared)
1649 return TRUE;
1650
1651 /* If there are no references to this symbol that do not use the
1652 GOT, we don't need to generate a copy reloc. */
1653 if (!h->non_got_ref)
1654 return TRUE;
1655
1656 /* If -z nocopyreloc was given, we won't generate them either. */
1657 if (info->nocopyreloc)
1658 {
1659 h->non_got_ref = 0;
1660 return TRUE;
1661 }
1662
1663 if (ELIMINATE_COPY_RELOCS)
1664 {
1665 struct elf_s390_link_hash_entry * eh;
1666 struct elf_dyn_relocs *p;
1667
1668 eh = (struct elf_s390_link_hash_entry *) h;
1669 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1670 {
1671 s = p->sec->output_section;
1672 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1673 break;
1674 }
1675
1676 /* If we didn't find any dynamic relocs in read-only sections, then
1677 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1678 if (p == NULL)
1679 {
1680 h->non_got_ref = 0;
1681 return TRUE;
1682 }
1683 }
1684
1685 /* We must allocate the symbol in our .dynbss section, which will
1686 become part of the .bss section of the executable. There will be
1687 an entry for this symbol in the .dynsym section. The dynamic
1688 object will contain position independent code, so all references
1689 from the dynamic object to this symbol will go through the global
1690 offset table. The dynamic linker will use the .dynsym entry to
1691 determine the address it must put in the global offset table, so
1692 both the dynamic object and the regular object will refer to the
1693 same memory location for the variable. */
1694
1695 htab = elf_s390_hash_table (info);
1696 if (htab == NULL)
1697 return FALSE;
1698
1699 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1700 copy the initial value out of the dynamic object and into the
1701 runtime process image. */
1702 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1703 {
1704 htab->srelbss->size += sizeof (Elf64_External_Rela);
1705 h->needs_copy = 1;
1706 }
1707
1708 s = htab->sdynbss;
1709
1710 return _bfd_elf_adjust_dynamic_copy (h, s);
1711 }
1712
1713 /* Allocate space in .plt, .got and associated reloc sections for
1714 dynamic relocs. */
1715
1716 static bfd_boolean
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)1717 allocate_dynrelocs (struct elf_link_hash_entry *h,
1718 void * inf)
1719 {
1720 struct bfd_link_info *info;
1721 struct elf_s390_link_hash_table *htab;
1722 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1723 struct elf_dyn_relocs *p;
1724
1725 if (h->root.type == bfd_link_hash_indirect)
1726 return TRUE;
1727
1728 info = (struct bfd_link_info *) inf;
1729 htab = elf_s390_hash_table (info);
1730 if (htab == NULL)
1731 return FALSE;
1732
1733 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1734 here if it is defined and referenced in a non-shared object. */
1735 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1736 return s390_elf_allocate_ifunc_dyn_relocs (info, h,
1737 &eh->dyn_relocs);
1738 else if (htab->elf.dynamic_sections_created
1739 && h->plt.refcount > 0)
1740 {
1741 /* Make sure this symbol is output as a dynamic symbol.
1742 Undefined weak syms won't yet be marked as dynamic. */
1743 if (h->dynindx == -1
1744 && !h->forced_local)
1745 {
1746 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1747 return FALSE;
1748 }
1749
1750 if (info->shared
1751 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1752 {
1753 asection *s = htab->elf.splt;
1754
1755 /* If this is the first .plt entry, make room for the special
1756 first entry. */
1757 if (s->size == 0)
1758 s->size += PLT_FIRST_ENTRY_SIZE;
1759
1760 h->plt.offset = s->size;
1761
1762 /* If this symbol is not defined in a regular file, and we are
1763 not generating a shared library, then set the symbol to this
1764 location in the .plt. This is required to make function
1765 pointers compare as equal between the normal executable and
1766 the shared library. */
1767 if (! info->shared
1768 && !h->def_regular)
1769 {
1770 h->root.u.def.section = s;
1771 h->root.u.def.value = h->plt.offset;
1772 }
1773
1774 /* Make room for this entry. */
1775 s->size += PLT_ENTRY_SIZE;
1776
1777 /* We also need to make an entry in the .got.plt section, which
1778 will be placed in the .got section by the linker script. */
1779 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1780
1781 /* We also need to make an entry in the .rela.plt section. */
1782 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1783 }
1784 else
1785 {
1786 h->plt.offset = (bfd_vma) -1;
1787 h->needs_plt = 0;
1788 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1789 }
1790 }
1791 else
1792 {
1793 h->plt.offset = (bfd_vma) -1;
1794 h->needs_plt = 0;
1795 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1796 }
1797
1798 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1799 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1800 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1801 we can save the dynamic TLS relocation. */
1802 if (h->got.refcount > 0
1803 && !info->shared
1804 && h->dynindx == -1
1805 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1806 {
1807 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1808 /* For the GOTIE access without a literal pool entry the offset has
1809 to be stored somewhere. The immediate value in the instruction
1810 is not bit enough so the value is stored in the got. */
1811 {
1812 h->got.offset = htab->elf.sgot->size;
1813 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1814 }
1815 else
1816 h->got.offset = (bfd_vma) -1;
1817 }
1818 else if (h->got.refcount > 0)
1819 {
1820 asection *s;
1821 bfd_boolean dyn;
1822 int tls_type = elf_s390_hash_entry(h)->tls_type;
1823
1824 /* Make sure this symbol is output as a dynamic symbol.
1825 Undefined weak syms won't yet be marked as dynamic. */
1826 if (h->dynindx == -1
1827 && !h->forced_local)
1828 {
1829 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1830 return FALSE;
1831 }
1832
1833 s = htab->elf.sgot;
1834 h->got.offset = s->size;
1835 s->size += GOT_ENTRY_SIZE;
1836 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1837 if (tls_type == GOT_TLS_GD)
1838 s->size += GOT_ENTRY_SIZE;
1839 dyn = htab->elf.dynamic_sections_created;
1840 /* R_390_TLS_IE64 needs one dynamic relocation,
1841 R_390_TLS_GD64 needs one if local symbol and two if global. */
1842 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1843 || tls_type >= GOT_TLS_IE)
1844 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1845 else if (tls_type == GOT_TLS_GD)
1846 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1847 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1848 || h->root.type != bfd_link_hash_undefweak)
1849 && (info->shared
1850 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1851 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1852 }
1853 else
1854 h->got.offset = (bfd_vma) -1;
1855
1856 if (eh->dyn_relocs == NULL)
1857 return TRUE;
1858
1859 /* In the shared -Bsymbolic case, discard space allocated for
1860 dynamic pc-relative relocs against symbols which turn out to be
1861 defined in regular objects. For the normal shared case, discard
1862 space for pc-relative relocs that have become local due to symbol
1863 visibility changes. */
1864
1865 if (info->shared)
1866 {
1867 if (SYMBOL_CALLS_LOCAL (info, h))
1868 {
1869 struct elf_dyn_relocs **pp;
1870
1871 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1872 {
1873 p->count -= p->pc_count;
1874 p->pc_count = 0;
1875 if (p->count == 0)
1876 *pp = p->next;
1877 else
1878 pp = &p->next;
1879 }
1880 }
1881
1882 /* Also discard relocs on undefined weak syms with non-default
1883 visibility. */
1884 if (eh->dyn_relocs != NULL
1885 && h->root.type == bfd_link_hash_undefweak)
1886 {
1887 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1888 eh->dyn_relocs = NULL;
1889
1890 /* Make sure undefined weak symbols are output as a dynamic
1891 symbol in PIEs. */
1892 else if (h->dynindx == -1
1893 && !h->forced_local)
1894 {
1895 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1896 return FALSE;
1897 }
1898 }
1899 }
1900 else if (ELIMINATE_COPY_RELOCS)
1901 {
1902 /* For the non-shared case, discard space for relocs against
1903 symbols which turn out to need copy relocs or are not
1904 dynamic. */
1905
1906 if (!h->non_got_ref
1907 && ((h->def_dynamic
1908 && !h->def_regular)
1909 || (htab->elf.dynamic_sections_created
1910 && (h->root.type == bfd_link_hash_undefweak
1911 || h->root.type == bfd_link_hash_undefined))))
1912 {
1913 /* Make sure this symbol is output as a dynamic symbol.
1914 Undefined weak syms won't yet be marked as dynamic. */
1915 if (h->dynindx == -1
1916 && !h->forced_local)
1917 {
1918 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1919 return FALSE;
1920 }
1921
1922 /* If that succeeded, we know we'll be keeping all the
1923 relocs. */
1924 if (h->dynindx != -1)
1925 goto keep;
1926 }
1927
1928 eh->dyn_relocs = NULL;
1929
1930 keep: ;
1931 }
1932
1933 /* Finally, allocate space. */
1934 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1935 {
1936 asection *sreloc = elf_section_data (p->sec)->sreloc;
1937 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1938 }
1939
1940 return TRUE;
1941 }
1942
1943 /* Find any dynamic relocs that apply to read-only sections. */
1944
1945 static bfd_boolean
readonly_dynrelocs(struct elf_link_hash_entry * h,void * inf)1946 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1947 {
1948 struct elf_s390_link_hash_entry *eh;
1949 struct elf_dyn_relocs *p;
1950
1951 eh = (struct elf_s390_link_hash_entry *) h;
1952 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1953 {
1954 asection *s = p->sec->output_section;
1955
1956 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1957 {
1958 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1959
1960 info->flags |= DF_TEXTREL;
1961
1962 /* Not an error, just cut short the traversal. */
1963 return FALSE;
1964 }
1965 }
1966 return TRUE;
1967 }
1968
1969 /* Set the sizes of the dynamic sections. */
1970
1971 static bfd_boolean
elf_s390_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)1972 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1973 struct bfd_link_info *info)
1974 {
1975 struct elf_s390_link_hash_table *htab;
1976 bfd *dynobj;
1977 asection *s;
1978 bfd_boolean relocs;
1979 bfd *ibfd;
1980
1981 htab = elf_s390_hash_table (info);
1982 if (htab == NULL)
1983 return FALSE;
1984
1985 dynobj = htab->elf.dynobj;
1986 if (dynobj == NULL)
1987 abort ();
1988
1989 if (htab->elf.dynamic_sections_created)
1990 {
1991 /* Set the contents of the .interp section to the interpreter. */
1992 if (info->executable)
1993 {
1994 s = bfd_get_linker_section (dynobj, ".interp");
1995 if (s == NULL)
1996 abort ();
1997 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1998 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1999 }
2000 }
2001
2002 /* Set up .got offsets for local syms, and space for local dynamic
2003 relocs. */
2004 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2005 {
2006 bfd_signed_vma *local_got;
2007 bfd_signed_vma *end_local_got;
2008 char *local_tls_type;
2009 bfd_size_type locsymcount;
2010 Elf_Internal_Shdr *symtab_hdr;
2011 asection *srela;
2012 struct plt_entry *local_plt;
2013 unsigned int i;
2014
2015 if (! is_s390_elf (ibfd))
2016 continue;
2017
2018 for (s = ibfd->sections; s != NULL; s = s->next)
2019 {
2020 struct elf_dyn_relocs *p;
2021
2022 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2023 {
2024 if (!bfd_is_abs_section (p->sec)
2025 && bfd_is_abs_section (p->sec->output_section))
2026 {
2027 /* Input section has been discarded, either because
2028 it is a copy of a linkonce section or due to
2029 linker script /DISCARD/, so we'll be discarding
2030 the relocs too. */
2031 }
2032 else if (p->count != 0)
2033 {
2034 srela = elf_section_data (p->sec)->sreloc;
2035 srela->size += p->count * sizeof (Elf64_External_Rela);
2036 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2037 info->flags |= DF_TEXTREL;
2038 }
2039 }
2040 }
2041
2042 local_got = elf_local_got_refcounts (ibfd);
2043 if (!local_got)
2044 continue;
2045
2046 symtab_hdr = &elf_symtab_hdr (ibfd);
2047 locsymcount = symtab_hdr->sh_info;
2048 end_local_got = local_got + locsymcount;
2049 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2050 s = htab->elf.sgot;
2051 srela = htab->elf.srelgot;
2052 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2053 {
2054 if (*local_got > 0)
2055 {
2056 *local_got = s->size;
2057 s->size += GOT_ENTRY_SIZE;
2058 if (*local_tls_type == GOT_TLS_GD)
2059 s->size += GOT_ENTRY_SIZE;
2060 if (info->shared)
2061 srela->size += sizeof (Elf64_External_Rela);
2062 }
2063 else
2064 *local_got = (bfd_vma) -1;
2065 }
2066
2067 local_plt = elf_s390_local_plt (ibfd);
2068 for (i = 0; i < symtab_hdr->sh_info; i++)
2069 {
2070 if (local_plt[i].plt.refcount > 0)
2071 {
2072 local_plt[i].plt.offset = htab->elf.iplt->size;
2073 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2074 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2075 htab->elf.irelplt->size += sizeof (Elf64_External_Rela);
2076 }
2077 else
2078 local_plt[i].plt.offset = (bfd_vma) -1;
2079 }
2080 }
2081
2082 if (htab->tls_ldm_got.refcount > 0)
2083 {
2084 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2085 relocs. */
2086 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2087 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2088 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2089 }
2090 else
2091 htab->tls_ldm_got.offset = -1;
2092
2093 /* Allocate global sym .plt and .got entries, and space for global
2094 sym dynamic relocs. */
2095 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2096
2097 /* We now have determined the sizes of the various dynamic sections.
2098 Allocate memory for them. */
2099 relocs = FALSE;
2100 for (s = dynobj->sections; s != NULL; s = s->next)
2101 {
2102 if ((s->flags & SEC_LINKER_CREATED) == 0)
2103 continue;
2104
2105 if (s == htab->elf.splt
2106 || s == htab->elf.sgot
2107 || s == htab->elf.sgotplt
2108 || s == htab->sdynbss
2109 || s == htab->elf.iplt
2110 || s == htab->elf.igotplt
2111 || s == htab->irelifunc)
2112 {
2113 /* Strip this section if we don't need it; see the
2114 comment below. */
2115 }
2116 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2117 {
2118 if (s->size != 0 && s != htab->elf.srelplt)
2119 relocs = TRUE;
2120
2121 /* We use the reloc_count field as a counter if we need
2122 to copy relocs into the output file. */
2123 s->reloc_count = 0;
2124 }
2125 else
2126 {
2127 /* It's not one of our sections, so don't allocate space. */
2128 continue;
2129 }
2130
2131 if (s->size == 0)
2132 {
2133 /* If we don't need this section, strip it from the
2134 output file. This is to handle .rela.bss and
2135 .rela.plt. We must create it in
2136 create_dynamic_sections, because it must be created
2137 before the linker maps input sections to output
2138 sections. The linker does that before
2139 adjust_dynamic_symbol is called, and it is that
2140 function which decides whether anything needs to go
2141 into these sections. */
2142
2143 s->flags |= SEC_EXCLUDE;
2144 continue;
2145 }
2146
2147 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2148 continue;
2149
2150 /* Allocate memory for the section contents. We use bfd_zalloc
2151 here in case unused entries are not reclaimed before the
2152 section's contents are written out. This should not happen,
2153 but this way if it does, we get a R_390_NONE reloc instead
2154 of garbage. */
2155 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2156 if (s->contents == NULL)
2157 return FALSE;
2158 }
2159
2160 if (htab->elf.dynamic_sections_created)
2161 {
2162 /* Add some entries to the .dynamic section. We fill in the
2163 values later, in elf_s390_finish_dynamic_sections, but we
2164 must add the entries now so that we get the correct size for
2165 the .dynamic section. The DT_DEBUG entry is filled in by the
2166 dynamic linker and used by the debugger. */
2167 #define add_dynamic_entry(TAG, VAL) \
2168 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2169
2170 if (info->executable)
2171 {
2172 if (!add_dynamic_entry (DT_DEBUG, 0))
2173 return FALSE;
2174 }
2175
2176 if (htab->elf.splt->size != 0)
2177 {
2178 if (!add_dynamic_entry (DT_PLTGOT, 0)
2179 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2180 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2181 || !add_dynamic_entry (DT_JMPREL, 0))
2182 return FALSE;
2183 }
2184
2185 if (relocs)
2186 {
2187 if (!add_dynamic_entry (DT_RELA, 0)
2188 || !add_dynamic_entry (DT_RELASZ, 0)
2189 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2190 return FALSE;
2191
2192 /* If any dynamic relocs apply to a read-only section,
2193 then we need a DT_TEXTREL entry. */
2194 if ((info->flags & DF_TEXTREL) == 0)
2195 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2196 info);
2197
2198 if ((info->flags & DF_TEXTREL) != 0)
2199 {
2200 if (!add_dynamic_entry (DT_TEXTREL, 0))
2201 return FALSE;
2202 }
2203 }
2204 }
2205 #undef add_dynamic_entry
2206
2207 return TRUE;
2208 }
2209
2210 /* Return the base VMA address which should be subtracted from real addresses
2211 when resolving @dtpoff relocation.
2212 This is PT_TLS segment p_vaddr. */
2213
2214 static bfd_vma
dtpoff_base(struct bfd_link_info * info)2215 dtpoff_base (struct bfd_link_info *info)
2216 {
2217 /* If tls_sec is NULL, we should have signalled an error already. */
2218 if (elf_hash_table (info)->tls_sec == NULL)
2219 return 0;
2220 return elf_hash_table (info)->tls_sec->vma;
2221 }
2222
2223 /* Return the relocation value for @tpoff relocation
2224 if STT_TLS virtual address is ADDRESS. */
2225
2226 static bfd_vma
tpoff(struct bfd_link_info * info,bfd_vma address)2227 tpoff (struct bfd_link_info *info, bfd_vma address)
2228 {
2229 struct elf_link_hash_table *htab = elf_hash_table (info);
2230
2231 /* If tls_sec is NULL, we should have signalled an error already. */
2232 if (htab->tls_sec == NULL)
2233 return 0;
2234 return htab->tls_size + htab->tls_sec->vma - address;
2235 }
2236
2237 /* Complain if TLS instruction relocation is against an invalid
2238 instruction. */
2239
2240 static void
invalid_tls_insn(bfd * input_bfd,asection * input_section,Elf_Internal_Rela * rel)2241 invalid_tls_insn (bfd *input_bfd,
2242 asection *input_section,
2243 Elf_Internal_Rela *rel)
2244 {
2245 reloc_howto_type *howto;
2246
2247 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2248 (*_bfd_error_handler)
2249 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2250 input_bfd,
2251 input_section,
2252 (long) rel->r_offset,
2253 howto->name);
2254 bfd_set_error (bfd_error_bad_value);
2255 }
2256
2257 /* Relocate a 390 ELF section. */
2258
2259 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)2260 elf_s390_relocate_section (bfd *output_bfd,
2261 struct bfd_link_info *info,
2262 bfd *input_bfd,
2263 asection *input_section,
2264 bfd_byte *contents,
2265 Elf_Internal_Rela *relocs,
2266 Elf_Internal_Sym *local_syms,
2267 asection **local_sections)
2268 {
2269 struct elf_s390_link_hash_table *htab;
2270 Elf_Internal_Shdr *symtab_hdr;
2271 struct elf_link_hash_entry **sym_hashes;
2272 bfd_vma *local_got_offsets;
2273 Elf_Internal_Rela *rel;
2274 Elf_Internal_Rela *relend;
2275
2276 BFD_ASSERT (is_s390_elf (input_bfd));
2277
2278 htab = elf_s390_hash_table (info);
2279 if (htab == NULL)
2280 return FALSE;
2281
2282 symtab_hdr = &elf_symtab_hdr (input_bfd);
2283 sym_hashes = elf_sym_hashes (input_bfd);
2284 local_got_offsets = elf_local_got_offsets (input_bfd);
2285
2286 rel = relocs;
2287 relend = relocs + input_section->reloc_count;
2288 for (; rel < relend; rel++)
2289 {
2290 unsigned int r_type;
2291 reloc_howto_type *howto;
2292 unsigned long r_symndx;
2293 struct elf_link_hash_entry *h;
2294 Elf_Internal_Sym *sym;
2295 asection *sec;
2296 bfd_vma off;
2297 bfd_vma relocation;
2298 bfd_boolean unresolved_reloc;
2299 bfd_reloc_status_type r;
2300 int tls_type;
2301 asection *base_got = htab->elf.sgot;
2302
2303 r_type = ELF64_R_TYPE (rel->r_info);
2304 if (r_type == (int) R_390_GNU_VTINHERIT
2305 || r_type == (int) R_390_GNU_VTENTRY)
2306 continue;
2307 if (r_type >= (int) R_390_max)
2308 {
2309 bfd_set_error (bfd_error_bad_value);
2310 return FALSE;
2311 }
2312
2313 howto = elf_howto_table + r_type;
2314 r_symndx = ELF64_R_SYM (rel->r_info);
2315
2316 h = NULL;
2317 sym = NULL;
2318 sec = NULL;
2319 unresolved_reloc = FALSE;
2320 if (r_symndx < symtab_hdr->sh_info)
2321 {
2322 sym = local_syms + r_symndx;
2323 sec = local_sections[r_symndx];
2324
2325 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2326 {
2327 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2328 if (local_plt == NULL)
2329 return FALSE;
2330
2331 /* Address of the PLT slot. */
2332 relocation = (htab->elf.iplt->output_section->vma
2333 + htab->elf.iplt->output_offset
2334 + local_plt[r_symndx].plt.offset);
2335
2336 switch (r_type)
2337 {
2338 case R_390_PLTOFF16:
2339 case R_390_PLTOFF32:
2340 case R_390_PLTOFF64:
2341 relocation -= htab->elf.sgot->output_section->vma;
2342 break;
2343 case R_390_GOTPLT12:
2344 case R_390_GOTPLT16:
2345 case R_390_GOTPLT20:
2346 case R_390_GOTPLT32:
2347 case R_390_GOTPLT64:
2348 case R_390_GOTPLTENT:
2349 case R_390_GOT12:
2350 case R_390_GOT16:
2351 case R_390_GOT20:
2352 case R_390_GOT32:
2353 case R_390_GOT64:
2354 case R_390_GOTENT:
2355 {
2356 /* Write the PLT slot address into the GOT slot. */
2357 bfd_put_64 (output_bfd, relocation,
2358 htab->elf.sgot->contents +
2359 local_got_offsets[r_symndx]);
2360 relocation = (local_got_offsets[r_symndx] +
2361 htab->elf.sgot->output_offset);
2362
2363 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2364 relocation += htab->elf.sgot->output_section->vma;
2365 break;
2366 }
2367 default:
2368 break;
2369 }
2370 /* The output section is needed later in
2371 finish_dynamic_section when creating the dynamic
2372 relocation. */
2373 local_plt[r_symndx].sec = sec;
2374 goto do_relocation;
2375 }
2376 else
2377 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2378 }
2379 else
2380 {
2381 bfd_boolean warned ATTRIBUTE_UNUSED;
2382 bfd_boolean ignored ATTRIBUTE_UNUSED;
2383
2384 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2385 r_symndx, symtab_hdr, sym_hashes,
2386 h, sec, relocation,
2387 unresolved_reloc, warned, ignored);
2388 }
2389
2390 if (sec != NULL && discarded_section (sec))
2391 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2392 rel, 1, relend, howto, 0, contents);
2393
2394 if (info->relocatable)
2395 continue;
2396
2397 switch (r_type)
2398 {
2399 case R_390_GOTPLT12:
2400 case R_390_GOTPLT16:
2401 case R_390_GOTPLT20:
2402 case R_390_GOTPLT32:
2403 case R_390_GOTPLT64:
2404 case R_390_GOTPLTENT:
2405 /* There are three cases for a GOTPLT relocation. 1) The
2406 relocation is against the jump slot entry of a plt that
2407 will get emitted to the output file. 2) The relocation
2408 is against the jump slot of a plt entry that has been
2409 removed. elf_s390_adjust_gotplt has created a GOT entry
2410 as replacement. 3) The relocation is against a local symbol.
2411 Cases 2) and 3) are the same as the GOT relocation code
2412 so we just have to test for case 1 and fall through for
2413 the other two. */
2414 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2415 {
2416 bfd_vma plt_index;
2417
2418 if (s390_is_ifunc_symbol_p (h))
2419 {
2420 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2421 relocation = (plt_index * GOT_ENTRY_SIZE +
2422 htab->elf.igotplt->output_offset);
2423 if (r_type == R_390_GOTPLTENT)
2424 relocation += htab->elf.igotplt->output_section->vma;
2425 }
2426 else
2427 {
2428 /* Calc. index no.
2429 Current offset - size first entry / entry size. */
2430 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2431 PLT_ENTRY_SIZE;
2432
2433 /* Offset in GOT is PLT index plus GOT headers(3)
2434 times 4, addr & GOT addr. */
2435 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2436 if (r_type == R_390_GOTPLTENT)
2437 relocation += htab->elf.sgot->output_section->vma;
2438 }
2439 unresolved_reloc = FALSE;
2440 break;
2441 }
2442 /* Fall through. */
2443
2444 case R_390_GOT12:
2445 case R_390_GOT16:
2446 case R_390_GOT20:
2447 case R_390_GOT32:
2448 case R_390_GOT64:
2449 case R_390_GOTENT:
2450 /* Relocation is to the entry for this symbol in the global
2451 offset table. */
2452 if (base_got == NULL)
2453 abort ();
2454
2455 if (h != NULL)
2456 {
2457 bfd_boolean dyn;
2458
2459 off = h->got.offset;
2460 dyn = htab->elf.dynamic_sections_created;
2461
2462 if (s390_is_ifunc_symbol_p (h))
2463 {
2464 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2465 if (off == (bfd_vma)-1)
2466 {
2467 /* No explicit GOT usage so redirect to the
2468 got.iplt slot. */
2469 base_got = htab->elf.igotplt;
2470 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2471 }
2472 else
2473 {
2474 /* Explicit GOT slots must contain the address
2475 of the PLT slot. This will be handled in
2476 finish_dynamic_symbol. */
2477 }
2478 }
2479 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2480 || (info->shared
2481 && SYMBOL_REFERENCES_LOCAL (info, h))
2482 || (ELF_ST_VISIBILITY (h->other)
2483 && h->root.type == bfd_link_hash_undefweak))
2484 {
2485 /* This is actually a static link, or it is a
2486 -Bsymbolic link and the symbol is defined
2487 locally, or the symbol was forced to be local
2488 because of a version file. We must initialize
2489 this entry in the global offset table. Since the
2490 offset must always be a multiple of 2, we use the
2491 least significant bit to record whether we have
2492 initialized it already.
2493
2494 When doing a dynamic link, we create a .rel.got
2495 relocation entry to initialize the value. This
2496 is done in the finish_dynamic_symbol routine. */
2497 if ((off & 1) != 0)
2498 off &= ~1;
2499 else
2500 {
2501 bfd_put_64 (output_bfd, relocation,
2502 base_got->contents + off);
2503 h->got.offset |= 1;
2504 }
2505
2506 if ((h->def_regular
2507 && info->shared
2508 && SYMBOL_REFERENCES_LOCAL (info, h))
2509 /* lgrl rx,sym@GOTENT -> larl rx, sym */
2510 && ((r_type == R_390_GOTENT
2511 && (bfd_get_16 (input_bfd,
2512 contents + rel->r_offset - 2)
2513 & 0xff0f) == 0xc408)
2514 /* lg rx, sym@GOT(r12) -> larl rx, sym */
2515 || (r_type == R_390_GOT20
2516 && (bfd_get_32 (input_bfd,
2517 contents + rel->r_offset - 2)
2518 & 0xff00f000) == 0xe300c000
2519 && bfd_get_8 (input_bfd,
2520 contents + rel->r_offset + 3) == 0x04)))
2521
2522 {
2523 unsigned short new_insn =
2524 (0xc000 | (bfd_get_8 (input_bfd,
2525 contents + rel->r_offset - 1) & 0xf0));
2526 bfd_put_16 (output_bfd, new_insn,
2527 contents + rel->r_offset - 2);
2528 r_type = R_390_PC32DBL;
2529 rel->r_addend = 2;
2530 howto = elf_howto_table + r_type;
2531 relocation = h->root.u.def.value
2532 + h->root.u.def.section->output_section->vma
2533 + h->root.u.def.section->output_offset;
2534 goto do_relocation;
2535 }
2536 }
2537 else
2538 unresolved_reloc = FALSE;
2539 }
2540 else
2541 {
2542 if (local_got_offsets == NULL)
2543 abort ();
2544
2545 off = local_got_offsets[r_symndx];
2546
2547 /* The offset must always be a multiple of 8. We use
2548 the least significant bit to record whether we have
2549 already generated the necessary reloc. */
2550 if ((off & 1) != 0)
2551 off &= ~1;
2552 else
2553 {
2554 bfd_put_64 (output_bfd, relocation,
2555 htab->elf.sgot->contents + off);
2556
2557 if (info->shared)
2558 {
2559 asection *s;
2560 Elf_Internal_Rela outrel;
2561 bfd_byte *loc;
2562
2563 s = htab->elf.srelgot;
2564 if (s == NULL)
2565 abort ();
2566
2567 outrel.r_offset = (htab->elf.sgot->output_section->vma
2568 + htab->elf.sgot->output_offset
2569 + off);
2570 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2571 outrel.r_addend = relocation;
2572 loc = s->contents;
2573 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2574 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2575 }
2576
2577 local_got_offsets[r_symndx] |= 1;
2578 }
2579 }
2580
2581 if (off >= (bfd_vma) -2)
2582 abort ();
2583
2584 relocation = base_got->output_offset + off;
2585
2586 /* For @GOTENT the relocation is against the offset between
2587 the instruction and the symbols entry in the GOT and not
2588 between the start of the GOT and the symbols entry. We
2589 add the vma of the GOT to get the correct value. */
2590 if ( r_type == R_390_GOTENT
2591 || r_type == R_390_GOTPLTENT)
2592 relocation += base_got->output_section->vma;
2593
2594 break;
2595
2596 case R_390_GOTOFF16:
2597 case R_390_GOTOFF32:
2598 case R_390_GOTOFF64:
2599 /* Relocation is relative to the start of the global offset
2600 table. */
2601
2602 /* Note that sgot->output_offset is not involved in this
2603 calculation. We always want the start of .got. If we
2604 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2605 permitted by the ABI, we might have to change this
2606 calculation. */
2607 relocation -= htab->elf.sgot->output_section->vma;
2608 break;
2609
2610 case R_390_GOTPC:
2611 case R_390_GOTPCDBL:
2612 /* Use global offset table as symbol value. */
2613 relocation = htab->elf.sgot->output_section->vma;
2614 unresolved_reloc = FALSE;
2615 break;
2616
2617 case R_390_PLT12DBL:
2618 case R_390_PLT16DBL:
2619 case R_390_PLT24DBL:
2620 case R_390_PLT32:
2621 case R_390_PLT32DBL:
2622 case R_390_PLT64:
2623 /* Relocation is to the entry for this symbol in the
2624 procedure linkage table. */
2625
2626 /* Resolve a PLT32 reloc against a local symbol directly,
2627 without using the procedure linkage table. */
2628 if (h == NULL)
2629 break;
2630
2631 if (h->plt.offset == (bfd_vma) -1
2632 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2633 {
2634 /* We didn't make a PLT entry for this symbol. This
2635 happens when statically linking PIC code, or when
2636 using -Bsymbolic. */
2637 break;
2638 }
2639 if (s390_is_ifunc_symbol_p (h))
2640 relocation = (htab->elf.iplt->output_section->vma
2641 + htab->elf.iplt->output_offset
2642 + h->plt.offset);
2643 else
2644 relocation = (htab->elf.splt->output_section->vma
2645 + htab->elf.splt->output_offset
2646 + h->plt.offset);
2647 unresolved_reloc = FALSE;
2648 break;
2649
2650 case R_390_PLTOFF16:
2651 case R_390_PLTOFF32:
2652 case R_390_PLTOFF64:
2653 /* Relocation is to the entry for this symbol in the
2654 procedure linkage table relative to the start of the GOT. */
2655
2656 /* For local symbols or if we didn't make a PLT entry for
2657 this symbol resolve the symbol directly. */
2658 if (h == NULL
2659 || h->plt.offset == (bfd_vma) -1
2660 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2661 {
2662 relocation -= htab->elf.sgot->output_section->vma;
2663 break;
2664 }
2665
2666 if (s390_is_ifunc_symbol_p (h))
2667 relocation = (htab->elf.iplt->output_section->vma
2668 + htab->elf.iplt->output_offset
2669 + h->plt.offset
2670 - htab->elf.sgot->output_section->vma);
2671 else
2672 relocation = (htab->elf.splt->output_section->vma
2673 + htab->elf.splt->output_offset
2674 + h->plt.offset
2675 - htab->elf.sgot->output_section->vma);
2676 unresolved_reloc = FALSE;
2677 break;
2678
2679 case R_390_8:
2680 case R_390_16:
2681 case R_390_32:
2682 case R_390_64:
2683 case R_390_PC16:
2684 case R_390_PC12DBL:
2685 case R_390_PC16DBL:
2686 case R_390_PC24DBL:
2687 case R_390_PC32:
2688 case R_390_PC32DBL:
2689 case R_390_PC64:
2690
2691 if (h != NULL
2692 && s390_is_ifunc_symbol_p (h)
2693 && h->def_regular)
2694 {
2695 if (!info->shared || !h->non_got_ref)
2696 {
2697 /* For a non-shared object STT_GNU_IFUNC symbol must
2698 go through PLT. */
2699 relocation = (htab->elf.iplt->output_section->vma
2700 + htab->elf.iplt->output_offset
2701 + h ->plt.offset);
2702 goto do_relocation;
2703 }
2704 else
2705 {
2706 /* For shared objects a runtime relocation is needed. */
2707
2708 Elf_Internal_Rela outrel;
2709 asection *sreloc;
2710
2711 /* Need a dynamic relocation to get the real function
2712 address. */
2713 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2714 info,
2715 input_section,
2716 rel->r_offset);
2717 if (outrel.r_offset == (bfd_vma) -1
2718 || outrel.r_offset == (bfd_vma) -2)
2719 abort ();
2720
2721 outrel.r_offset += (input_section->output_section->vma
2722 + input_section->output_offset);
2723
2724 if (h->dynindx == -1
2725 || h->forced_local
2726 || info->executable)
2727 {
2728 /* This symbol is resolved locally. */
2729 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
2730 outrel.r_addend = (h->root.u.def.value
2731 + h->root.u.def.section->output_section->vma
2732 + h->root.u.def.section->output_offset);
2733 }
2734 else
2735 {
2736 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2737 outrel.r_addend = 0;
2738 }
2739
2740 sreloc = htab->elf.irelifunc;
2741 elf_append_rela (output_bfd, sreloc, &outrel);
2742
2743 /* If this reloc is against an external symbol, we
2744 do not want to fiddle with the addend. Otherwise,
2745 we need to include the symbol value so that it
2746 becomes an addend for the dynamic reloc. For an
2747 internal symbol, we have updated addend. */
2748 continue;
2749 }
2750 }
2751
2752 if ((input_section->flags & SEC_ALLOC) == 0)
2753 break;
2754
2755 if ((info->shared
2756 && (h == NULL
2757 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2758 || h->root.type != bfd_link_hash_undefweak)
2759 && ((r_type != R_390_PC16
2760 && r_type != R_390_PC12DBL
2761 && r_type != R_390_PC16DBL
2762 && r_type != R_390_PC24DBL
2763 && r_type != R_390_PC32
2764 && r_type != R_390_PC32DBL
2765 && r_type != R_390_PC64)
2766 || !SYMBOL_CALLS_LOCAL (info, h)))
2767 || (ELIMINATE_COPY_RELOCS
2768 && !info->shared
2769 && h != NULL
2770 && h->dynindx != -1
2771 && !h->non_got_ref
2772 && ((h->def_dynamic
2773 && !h->def_regular)
2774 || h->root.type == bfd_link_hash_undefweak
2775 || h->root.type == bfd_link_hash_undefined)))
2776 {
2777 Elf_Internal_Rela outrel;
2778 bfd_boolean skip, relocate;
2779 asection *sreloc;
2780 bfd_byte *loc;
2781
2782 /* When generating a shared object, these relocations
2783 are copied into the output file to be resolved at run
2784 time. */
2785 skip = FALSE;
2786 relocate = FALSE;
2787
2788 outrel.r_offset =
2789 _bfd_elf_section_offset (output_bfd, info, input_section,
2790 rel->r_offset);
2791 if (outrel.r_offset == (bfd_vma) -1)
2792 skip = TRUE;
2793 else if (outrel.r_offset == (bfd_vma) -2)
2794 skip = TRUE, relocate = TRUE;
2795
2796 outrel.r_offset += (input_section->output_section->vma
2797 + input_section->output_offset);
2798
2799 if (skip)
2800 memset (&outrel, 0, sizeof outrel);
2801 else if (h != NULL
2802 && h->dynindx != -1
2803 && (r_type == R_390_PC16
2804 || r_type == R_390_PC12DBL
2805 || r_type == R_390_PC16DBL
2806 || r_type == R_390_PC24DBL
2807 || r_type == R_390_PC32
2808 || r_type == R_390_PC32DBL
2809 || r_type == R_390_PC64
2810 || !info->shared
2811 || !SYMBOLIC_BIND (info, h)
2812 || !h->def_regular))
2813 {
2814 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2815 outrel.r_addend = rel->r_addend;
2816 }
2817 else
2818 {
2819 /* This symbol is local, or marked to become local. */
2820 outrel.r_addend = relocation + rel->r_addend;
2821 if (r_type == R_390_64)
2822 {
2823 relocate = TRUE;
2824 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2825 }
2826 else
2827 {
2828 long sindx;
2829
2830 if (bfd_is_abs_section (sec))
2831 sindx = 0;
2832 else if (sec == NULL || sec->owner == NULL)
2833 {
2834 bfd_set_error(bfd_error_bad_value);
2835 return FALSE;
2836 }
2837 else
2838 {
2839 asection *osec;
2840
2841 osec = sec->output_section;
2842 sindx = elf_section_data (osec)->dynindx;
2843
2844 if (sindx == 0)
2845 {
2846 osec = htab->elf.text_index_section;
2847 sindx = elf_section_data (osec)->dynindx;
2848 }
2849 BFD_ASSERT (sindx != 0);
2850
2851 /* We are turning this relocation into one
2852 against a section symbol, so subtract out
2853 the output section's address but not the
2854 offset of the input section in the output
2855 section. */
2856 outrel.r_addend -= osec->vma;
2857 }
2858 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2859 }
2860 }
2861
2862 sreloc = elf_section_data (input_section)->sreloc;
2863 if (sreloc == NULL)
2864 abort ();
2865
2866 loc = sreloc->contents;
2867 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2868 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2869
2870 /* If this reloc is against an external symbol, we do
2871 not want to fiddle with the addend. Otherwise, we
2872 need to include the symbol value so that it becomes
2873 an addend for the dynamic reloc. */
2874 if (! relocate)
2875 continue;
2876 }
2877
2878 break;
2879
2880 /* Relocations for tls literal pool entries. */
2881 case R_390_TLS_IE64:
2882 if (info->shared)
2883 {
2884 Elf_Internal_Rela outrel;
2885 asection *sreloc;
2886 bfd_byte *loc;
2887
2888 outrel.r_offset = rel->r_offset
2889 + input_section->output_section->vma
2890 + input_section->output_offset;
2891 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2892 sreloc = elf_section_data (input_section)->sreloc;
2893 if (sreloc == NULL)
2894 abort ();
2895 loc = sreloc->contents;
2896 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2897 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2898 }
2899 /* Fall through. */
2900
2901 case R_390_TLS_GD64:
2902 case R_390_TLS_GOTIE64:
2903 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2904 tls_type = GOT_UNKNOWN;
2905 if (h == NULL && local_got_offsets)
2906 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2907 else if (h != NULL)
2908 {
2909 tls_type = elf_s390_hash_entry(h)->tls_type;
2910 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2911 r_type = R_390_TLS_LE64;
2912 }
2913 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2914 r_type = R_390_TLS_IE64;
2915
2916 if (r_type == R_390_TLS_LE64)
2917 {
2918 /* This relocation gets optimized away by the local exec
2919 access optimization. */
2920 BFD_ASSERT (! unresolved_reloc);
2921 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2922 contents + rel->r_offset);
2923 continue;
2924 }
2925
2926 if (htab->elf.sgot == NULL)
2927 abort ();
2928
2929 if (h != NULL)
2930 off = h->got.offset;
2931 else
2932 {
2933 if (local_got_offsets == NULL)
2934 abort ();
2935
2936 off = local_got_offsets[r_symndx];
2937 }
2938
2939 emit_tls_relocs:
2940
2941 if ((off & 1) != 0)
2942 off &= ~1;
2943 else
2944 {
2945 Elf_Internal_Rela outrel;
2946 bfd_byte *loc;
2947 int dr_type, indx;
2948
2949 if (htab->elf.srelgot == NULL)
2950 abort ();
2951
2952 outrel.r_offset = (htab->elf.sgot->output_section->vma
2953 + htab->elf.sgot->output_offset + off);
2954
2955 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2956 if (r_type == R_390_TLS_GD64)
2957 dr_type = R_390_TLS_DTPMOD;
2958 else
2959 dr_type = R_390_TLS_TPOFF;
2960 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2961 outrel.r_addend = relocation - dtpoff_base (info);
2962 else
2963 outrel.r_addend = 0;
2964 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2965 loc = htab->elf.srelgot->contents;
2966 loc += htab->elf.srelgot->reloc_count++
2967 * sizeof (Elf64_External_Rela);
2968 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2969
2970 if (r_type == R_390_TLS_GD64)
2971 {
2972 if (indx == 0)
2973 {
2974 BFD_ASSERT (! unresolved_reloc);
2975 bfd_put_64 (output_bfd,
2976 relocation - dtpoff_base (info),
2977 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2978 }
2979 else
2980 {
2981 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2982 outrel.r_offset += GOT_ENTRY_SIZE;
2983 outrel.r_addend = 0;
2984 htab->elf.srelgot->reloc_count++;
2985 loc += sizeof (Elf64_External_Rela);
2986 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2987 }
2988 }
2989
2990 if (h != NULL)
2991 h->got.offset |= 1;
2992 else
2993 local_got_offsets[r_symndx] |= 1;
2994 }
2995
2996 if (off >= (bfd_vma) -2)
2997 abort ();
2998 if (r_type == ELF64_R_TYPE (rel->r_info))
2999 {
3000 relocation = htab->elf.sgot->output_offset + off;
3001 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
3002 relocation += htab->elf.sgot->output_section->vma;
3003 unresolved_reloc = FALSE;
3004 }
3005 else
3006 {
3007 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
3008 contents + rel->r_offset);
3009 continue;
3010 }
3011 break;
3012
3013 case R_390_TLS_GOTIE12:
3014 case R_390_TLS_GOTIE20:
3015 case R_390_TLS_IEENT:
3016 if (h == NULL)
3017 {
3018 if (local_got_offsets == NULL)
3019 abort();
3020 off = local_got_offsets[r_symndx];
3021 if (info->shared)
3022 goto emit_tls_relocs;
3023 }
3024 else
3025 {
3026 off = h->got.offset;
3027 tls_type = elf_s390_hash_entry(h)->tls_type;
3028 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
3029 goto emit_tls_relocs;
3030 }
3031
3032 if (htab->elf.sgot == NULL)
3033 abort ();
3034
3035 BFD_ASSERT (! unresolved_reloc);
3036 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3037 htab->elf.sgot->contents + off);
3038 relocation = htab->elf.sgot->output_offset + off;
3039 if (r_type == R_390_TLS_IEENT)
3040 relocation += htab->elf.sgot->output_section->vma;
3041 unresolved_reloc = FALSE;
3042 break;
3043
3044 case R_390_TLS_LDM64:
3045 if (! info->shared)
3046 /* The literal pool entry this relocation refers to gets ignored
3047 by the optimized code of the local exec model. Do nothing
3048 and the value will turn out zero. */
3049 continue;
3050
3051 if (htab->elf.sgot == NULL)
3052 abort ();
3053
3054 off = htab->tls_ldm_got.offset;
3055 if (off & 1)
3056 off &= ~1;
3057 else
3058 {
3059 Elf_Internal_Rela outrel;
3060 bfd_byte *loc;
3061
3062 if (htab->elf.srelgot == NULL)
3063 abort ();
3064
3065 outrel.r_offset = (htab->elf.sgot->output_section->vma
3066 + htab->elf.sgot->output_offset + off);
3067
3068 bfd_put_64 (output_bfd, 0,
3069 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3070 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
3071 outrel.r_addend = 0;
3072 loc = htab->elf.srelgot->contents;
3073 loc += htab->elf.srelgot->reloc_count++
3074 * sizeof (Elf64_External_Rela);
3075 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3076 htab->tls_ldm_got.offset |= 1;
3077 }
3078 relocation = htab->elf.sgot->output_offset + off;
3079 unresolved_reloc = FALSE;
3080 break;
3081
3082 case R_390_TLS_LE64:
3083 if (info->shared && !info->pie)
3084 {
3085 /* Linking a shared library with non-fpic code requires
3086 a R_390_TLS_TPOFF relocation. */
3087 Elf_Internal_Rela outrel;
3088 asection *sreloc;
3089 bfd_byte *loc;
3090 int indx;
3091
3092 outrel.r_offset = rel->r_offset
3093 + input_section->output_section->vma
3094 + input_section->output_offset;
3095 if (h != NULL && h->dynindx != -1)
3096 indx = h->dynindx;
3097 else
3098 indx = 0;
3099 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
3100 if (indx == 0)
3101 outrel.r_addend = relocation - dtpoff_base (info);
3102 else
3103 outrel.r_addend = 0;
3104 sreloc = elf_section_data (input_section)->sreloc;
3105 if (sreloc == NULL)
3106 abort ();
3107 loc = sreloc->contents;
3108 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3109 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3110 }
3111 else
3112 {
3113 BFD_ASSERT (! unresolved_reloc);
3114 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3115 contents + rel->r_offset);
3116 }
3117 continue;
3118
3119 case R_390_TLS_LDO64:
3120 if (info->shared || (input_section->flags & SEC_DEBUGGING))
3121 relocation -= dtpoff_base (info);
3122 else
3123 /* When converting LDO to LE, we must negate. */
3124 relocation = -tpoff (info, relocation);
3125 break;
3126
3127 /* Relocations for tls instructions. */
3128 case R_390_TLS_LOAD:
3129 case R_390_TLS_GDCALL:
3130 case R_390_TLS_LDCALL:
3131 tls_type = GOT_UNKNOWN;
3132 if (h == NULL && local_got_offsets)
3133 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3134 else if (h != NULL)
3135 tls_type = elf_s390_hash_entry(h)->tls_type;
3136
3137 if (tls_type == GOT_TLS_GD)
3138 continue;
3139
3140 if (r_type == R_390_TLS_LOAD)
3141 {
3142 if (!info->shared && (h == NULL || h->dynindx == -1))
3143 {
3144 /* IE->LE transition. Four valid cases:
3145 lg %rx,(0,%ry) -> sllg %rx,%ry,0
3146 lg %rx,(%ry,0) -> sllg %rx,%ry,0
3147 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
3148 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
3149 unsigned int insn0, insn1, ry;
3150
3151 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3152 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3153 if (insn1 != 0x0004)
3154 invalid_tls_insn (input_bfd, input_section, rel);
3155 ry = 0;
3156 if ((insn0 & 0xff00f000) == 0xe3000000)
3157 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
3158 ry = (insn0 & 0x000f0000);
3159 else if ((insn0 & 0xff0f0000) == 0xe3000000)
3160 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
3161 ry = (insn0 & 0x0000f000) << 4;
3162 else if ((insn0 & 0xff00f000) == 0xe300c000)
3163 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
3164 ry = (insn0 & 0x000f0000);
3165 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
3166 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
3167 ry = (insn0 & 0x0000f000) << 4;
3168 else
3169 invalid_tls_insn (input_bfd, input_section, rel);
3170 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
3171 insn1 = 0x000d;
3172 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3173 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3174 }
3175 }
3176 else if (r_type == R_390_TLS_GDCALL)
3177 {
3178 unsigned int insn0, insn1;
3179
3180 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3181 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3182 if ((insn0 & 0xffff0000) != 0xc0e50000)
3183 invalid_tls_insn (input_bfd, input_section, rel);
3184 if (!info->shared && (h == NULL || h->dynindx == -1))
3185 {
3186 /* GD->LE transition.
3187 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3188 insn0 = 0xc0040000;
3189 insn1 = 0x0000;
3190 }
3191 else
3192 {
3193 /* GD->IE transition.
3194 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
3195 insn0 = 0xe322c000;
3196 insn1 = 0x0004;
3197 }
3198 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3199 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3200 }
3201 else if (r_type == R_390_TLS_LDCALL)
3202 {
3203 if (!info->shared)
3204 {
3205 unsigned int insn0, insn1;
3206
3207 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3208 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3209 if ((insn0 & 0xffff0000) != 0xc0e50000)
3210 invalid_tls_insn (input_bfd, input_section, rel);
3211 /* LD->LE transition.
3212 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3213 insn0 = 0xc0040000;
3214 insn1 = 0x0000;
3215 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3216 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3217 }
3218 }
3219 continue;
3220
3221 default:
3222 break;
3223 }
3224
3225 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3226 because such sections are not SEC_ALLOC and thus ld.so will
3227 not process them. */
3228 if (unresolved_reloc
3229 && !((input_section->flags & SEC_DEBUGGING) != 0
3230 && h->def_dynamic)
3231 && _bfd_elf_section_offset (output_bfd, info, input_section,
3232 rel->r_offset) != (bfd_vma) -1)
3233 (*_bfd_error_handler)
3234 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3235 input_bfd,
3236 input_section,
3237 (long) rel->r_offset,
3238 howto->name,
3239 h->root.root.string);
3240
3241 do_relocation:
3242
3243 /* When applying a 24 bit reloc we need to start one byte
3244 earlier. Otherwise the 32 bit get/put bfd operations might
3245 access a byte after the actual section. */
3246 if (r_type == R_390_PC24DBL
3247 || r_type == R_390_PLT24DBL)
3248 rel->r_offset--;
3249
3250 if (r_type == R_390_20
3251 || r_type == R_390_GOT20
3252 || r_type == R_390_GOTPLT20
3253 || r_type == R_390_TLS_GOTIE20)
3254 {
3255 relocation += rel->r_addend;
3256 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3257 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3258 contents, rel->r_offset,
3259 relocation, 0);
3260 }
3261 else
3262 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3263 contents, rel->r_offset,
3264 relocation, rel->r_addend);
3265
3266 if (r != bfd_reloc_ok)
3267 {
3268 const char *name;
3269
3270 if (h != NULL)
3271 name = h->root.root.string;
3272 else
3273 {
3274 name = bfd_elf_string_from_elf_section (input_bfd,
3275 symtab_hdr->sh_link,
3276 sym->st_name);
3277 if (name == NULL)
3278 return FALSE;
3279 if (*name == '\0')
3280 name = bfd_section_name (input_bfd, sec);
3281 }
3282
3283 if (r == bfd_reloc_overflow)
3284 {
3285
3286 if (! ((*info->callbacks->reloc_overflow)
3287 (info, (h ? &h->root : NULL), name, howto->name,
3288 (bfd_vma) 0, input_bfd, input_section,
3289 rel->r_offset)))
3290 return FALSE;
3291 }
3292 else
3293 {
3294 (*_bfd_error_handler)
3295 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3296 input_bfd, input_section,
3297 (long) rel->r_offset, name, (int) r);
3298 return FALSE;
3299 }
3300 }
3301 }
3302
3303 return TRUE;
3304 }
3305
3306 /* Generate the PLT slots together with the dynamic relocations needed
3307 for IFUNC symbols. */
3308
3309 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)3310 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3311 struct bfd_link_info *info,
3312 struct elf_link_hash_entry *h,
3313 struct elf_s390_link_hash_table *htab,
3314 bfd_vma plt_offset,
3315 bfd_vma resolver_address)
3316 {
3317 bfd_vma plt_index;
3318 bfd_vma got_offset;
3319 Elf_Internal_Rela rela;
3320 bfd_byte *loc;
3321 asection *plt, *gotplt, *relplt;
3322
3323 if (htab->elf.iplt == NULL
3324 || htab->elf.igotplt == NULL
3325 || htab->elf.irelplt == NULL)
3326 abort ();
3327
3328 /* Index of the PLT slot within iplt section. */
3329 plt_index = plt_offset / PLT_ENTRY_SIZE;
3330 plt = htab->elf.iplt;
3331 /* Offset into the igot.plt section. */
3332 got_offset = plt_index * GOT_ENTRY_SIZE;
3333 gotplt = htab->elf.igotplt;
3334 relplt = htab->elf.irelplt;
3335
3336 /* Fill in the blueprint of a PLT. */
3337 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
3338 PLT_ENTRY_SIZE);
3339
3340 /* Fixup the relative address to the GOT entry */
3341 bfd_put_32 (output_bfd,
3342 (gotplt->output_section->vma +
3343 gotplt->output_offset + got_offset
3344 - (plt->output_section->vma +
3345 plt->output_offset +
3346 plt_offset))/2,
3347 plt->contents + plt_offset + 2);
3348 /* Fixup the relative branch to PLT 0 */
3349 bfd_put_32 (output_bfd, - (plt->output_offset +
3350 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3351 plt->contents + plt_offset + 24);
3352 /* Fixup offset into .rela.plt section. */
3353 bfd_put_32 (output_bfd, relplt->output_offset +
3354 plt_index * sizeof (Elf64_External_Rela),
3355 plt->contents + plt_offset + 28);
3356
3357 /* Fill in the entry in the global offset table.
3358 Points to instruction after GOT offset. */
3359 bfd_put_64 (output_bfd,
3360 (plt->output_section->vma
3361 + plt->output_offset
3362 + plt_offset
3363 + 14),
3364 gotplt->contents + got_offset);
3365
3366 /* Fill in the entry in the .rela.plt section. */
3367 rela.r_offset = (gotplt->output_section->vma
3368 + gotplt->output_offset
3369 + got_offset);
3370
3371 if (!h
3372 || h->dynindx == -1
3373 || ((info->executable
3374 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3375 && h->def_regular))
3376 {
3377 /* The symbol can be locally resolved. */
3378 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
3379 rela.r_addend = resolver_address;
3380 }
3381 else
3382 {
3383 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3384 rela.r_addend = 0;
3385 }
3386
3387 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3388 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3389 }
3390
3391
3392 /* Finish up dynamic symbol handling. We set the contents of various
3393 dynamic sections here. */
3394
3395 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)3396 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3397 struct bfd_link_info *info,
3398 struct elf_link_hash_entry *h,
3399 Elf_Internal_Sym *sym)
3400 {
3401 struct elf_s390_link_hash_table *htab;
3402 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3403
3404 htab = elf_s390_hash_table (info);
3405 if (htab == NULL)
3406 return FALSE;
3407
3408 if (h->plt.offset != (bfd_vma) -1)
3409 {
3410 bfd_vma plt_index;
3411 bfd_vma got_offset;
3412 Elf_Internal_Rela rela;
3413 bfd_byte *loc;
3414
3415 /* This symbol has an entry in the procedure linkage table. Set
3416 it up. */
3417 if (s390_is_ifunc_symbol_p (h))
3418 {
3419 /* If we can resolve the IFUNC symbol locally we generate an
3420 IRELATIVE reloc. */
3421 elf_s390_finish_ifunc_symbol (output_bfd, info, h, htab, h->plt.offset,
3422 eh->ifunc_resolver_address +
3423 eh->ifunc_resolver_section->output_offset +
3424 eh->ifunc_resolver_section->output_section->vma);
3425 ;
3426 /* Fallthrough. Handling of explicit GOT slots of IFUNC
3427 symbols is below. */
3428 }
3429 else
3430 {
3431 if (h->dynindx == -1
3432 || htab->elf.splt == NULL
3433 || htab->elf.sgotplt == NULL
3434 || htab->elf.srelplt == NULL)
3435 abort ();
3436
3437 /* Calc. index no.
3438 Current offset - size first entry / entry size. */
3439 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3440
3441 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3442 addr & GOT addr. */
3443 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3444
3445 /* Fill in the blueprint of a PLT. */
3446 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
3447 PLT_ENTRY_SIZE);
3448
3449 /* Fixup the relative address to the GOT entry */
3450 bfd_put_32 (output_bfd,
3451 (htab->elf.sgotplt->output_section->vma +
3452 htab->elf.sgotplt->output_offset + got_offset
3453 - (htab->elf.splt->output_section->vma +
3454 htab->elf.splt->output_offset +
3455 h->plt.offset))/2,
3456 htab->elf.splt->contents + h->plt.offset + 2);
3457 /* Fixup the relative branch to PLT 0 */
3458 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3459 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3460 htab->elf.splt->contents + h->plt.offset + 24);
3461 /* Fixup offset into .rela.plt section. */
3462 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3463 htab->elf.splt->contents + h->plt.offset + 28);
3464
3465 /* Fill in the entry in the global offset table.
3466 Points to instruction after GOT offset. */
3467 bfd_put_64 (output_bfd,
3468 (htab->elf.splt->output_section->vma
3469 + htab->elf.splt->output_offset
3470 + h->plt.offset
3471 + 14),
3472 htab->elf.sgotplt->contents + got_offset);
3473
3474 /* Fill in the entry in the .rela.plt section. */
3475 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3476 + htab->elf.sgotplt->output_offset
3477 + got_offset);
3478 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3479 rela.r_addend = 0;
3480 loc = htab->elf.srelplt->contents + plt_index *
3481 sizeof (Elf64_External_Rela);
3482 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3483
3484 if (!h->def_regular)
3485 {
3486 /* Mark the symbol as undefined, rather than as defined in
3487 the .plt section. Leave the value alone. This is a clue
3488 for the dynamic linker, to make function pointer
3489 comparisons work between an application and shared
3490 library. */
3491 sym->st_shndx = SHN_UNDEF;
3492 }
3493 }
3494 }
3495
3496 if (h->got.offset != (bfd_vma) -1
3497 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3498 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3499 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3500 {
3501 Elf_Internal_Rela rela;
3502 bfd_byte *loc;
3503
3504 /* This symbol has an entry in the global offset table. Set it
3505 up. */
3506 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3507 abort ();
3508
3509 rela.r_offset = (htab->elf.sgot->output_section->vma
3510 + htab->elf.sgot->output_offset
3511 + (h->got.offset &~ (bfd_vma) 1));
3512
3513 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3514 {
3515 if (info->shared)
3516 {
3517 /* An explicit GOT slot usage needs GLOB_DAT. If the
3518 symbol references local the implicit got.iplt slot
3519 will be used and the IRELATIVE reloc has been created
3520 above. */
3521 goto do_glob_dat;
3522 }
3523 else
3524 {
3525 /* For non-shared objects explicit GOT slots must be
3526 filled with the PLT slot address for pointer
3527 equality reasons. */
3528 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
3529 + htab->elf.iplt->output_offset
3530 + h->plt.offset),
3531 htab->elf.sgot->contents + h->got.offset);
3532 return TRUE;
3533 }
3534 }
3535 else if (info->shared
3536 && SYMBOL_REFERENCES_LOCAL (info, h))
3537 {
3538 /* If this is a static link, or it is a -Bsymbolic link and
3539 the symbol is defined locally or was forced to be local
3540 because of a version file, we just want to emit a
3541 RELATIVE reloc. The entry in the global offset table
3542 will already have been initialized in the
3543 relocate_section function. */
3544 if (!h->def_regular)
3545 return FALSE;
3546 BFD_ASSERT((h->got.offset & 1) != 0);
3547 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3548 rela.r_addend = (h->root.u.def.value
3549 + h->root.u.def.section->output_section->vma
3550 + h->root.u.def.section->output_offset);
3551 }
3552 else
3553 {
3554 BFD_ASSERT((h->got.offset & 1) == 0);
3555 do_glob_dat:
3556 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3557 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3558 rela.r_addend = 0;
3559 }
3560
3561 loc = htab->elf.srelgot->contents;
3562 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3563 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3564 }
3565
3566 if (h->needs_copy)
3567 {
3568 Elf_Internal_Rela rela;
3569 bfd_byte *loc;
3570
3571 /* This symbols needs a copy reloc. Set it up. */
3572
3573 if (h->dynindx == -1
3574 || (h->root.type != bfd_link_hash_defined
3575 && h->root.type != bfd_link_hash_defweak)
3576 || htab->srelbss == NULL)
3577 abort ();
3578
3579 rela.r_offset = (h->root.u.def.value
3580 + h->root.u.def.section->output_section->vma
3581 + h->root.u.def.section->output_offset);
3582 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3583 rela.r_addend = 0;
3584 loc = htab->srelbss->contents;
3585 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3586 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3587 }
3588
3589 /* Mark some specially defined symbols as absolute. */
3590 if (h == htab->elf.hdynamic
3591 || h == htab->elf.hgot
3592 || h == htab->elf.hplt)
3593 sym->st_shndx = SHN_ABS;
3594
3595 return TRUE;
3596 }
3597
3598 /* Used to decide how to sort relocs in an optimal manner for the
3599 dynamic linker, before writing them out. */
3600
3601 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)3602 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3603 const asection *rel_sec ATTRIBUTE_UNUSED,
3604 const Elf_Internal_Rela *rela)
3605 {
3606 switch ((int) ELF64_R_TYPE (rela->r_info))
3607 {
3608 case R_390_RELATIVE:
3609 return reloc_class_relative;
3610 case R_390_JMP_SLOT:
3611 return reloc_class_plt;
3612 case R_390_COPY:
3613 return reloc_class_copy;
3614 default:
3615 return reloc_class_normal;
3616 }
3617 }
3618
3619 /* Finish up the dynamic sections. */
3620
3621 static bfd_boolean
elf_s390_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3622 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3623 struct bfd_link_info *info)
3624 {
3625 struct elf_s390_link_hash_table *htab;
3626 bfd *dynobj;
3627 asection *sdyn;
3628 bfd *ibfd;
3629 unsigned int i;
3630
3631 htab = elf_s390_hash_table (info);
3632 if (htab == NULL)
3633 return FALSE;
3634
3635 dynobj = htab->elf.dynobj;
3636 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3637
3638 if (htab->elf.dynamic_sections_created)
3639 {
3640 Elf64_External_Dyn *dyncon, *dynconend;
3641
3642 if (sdyn == NULL || htab->elf.sgot == NULL)
3643 abort ();
3644
3645 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3646 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3647 for (; dyncon < dynconend; dyncon++)
3648 {
3649 Elf_Internal_Dyn dyn;
3650 asection *s;
3651
3652 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3653
3654 switch (dyn.d_tag)
3655 {
3656 default:
3657 continue;
3658
3659 case DT_PLTGOT:
3660 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma;
3661 break;
3662
3663 case DT_JMPREL:
3664 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
3665 break;
3666
3667 case DT_PLTRELSZ:
3668 s = htab->elf.srelplt->output_section;
3669 dyn.d_un.d_val = s->size;
3670 break;
3671
3672 case DT_RELASZ:
3673 /* The procedure linkage table relocs (DT_JMPREL) should
3674 not be included in the overall relocs (DT_RELA).
3675 Therefore, we override the DT_RELASZ entry here to
3676 make it not include the JMPREL relocs. Since the
3677 linker script arranges for .rela.plt to follow all
3678 other relocation sections, we don't have to worry
3679 about changing the DT_RELA entry. */
3680 s = htab->elf.srelplt->output_section;
3681 dyn.d_un.d_val -= s->size;
3682 break;
3683 }
3684
3685 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3686 }
3687
3688 /* Fill in the special first entry in the procedure linkage table. */
3689 if (htab->elf.splt && htab->elf.splt->size > 0)
3690 {
3691 /* fill in blueprint for plt 0 entry */
3692 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
3693 PLT_FIRST_ENTRY_SIZE);
3694 /* Fixup relative address to start of GOT */
3695 bfd_put_32 (output_bfd,
3696 (htab->elf.sgotplt->output_section->vma +
3697 htab->elf.sgotplt->output_offset
3698 - htab->elf.splt->output_section->vma - 6)/2,
3699 htab->elf.splt->contents + 8);
3700 }
3701 if (elf_section_data (htab->elf.splt->output_section) != NULL)
3702 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
3703 = PLT_ENTRY_SIZE;
3704 }
3705
3706 if (htab->elf.sgotplt)
3707 {
3708 /* Fill in the first three entries in the global offset table. */
3709 if (htab->elf.sgotplt->size > 0)
3710 {
3711 bfd_put_64 (output_bfd,
3712 (sdyn == NULL ? (bfd_vma) 0
3713 : sdyn->output_section->vma + sdyn->output_offset),
3714 htab->elf.sgotplt->contents);
3715 /* One entry for shared object struct ptr. */
3716 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3717 /* One entry for _dl_runtime_resolve. */
3718 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 12);
3719 }
3720
3721 elf_section_data (htab->elf.sgot->output_section)
3722 ->this_hdr.sh_entsize = 8;
3723 }
3724
3725 /* Finish dynamic symbol for local IFUNC symbols. */
3726 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3727 {
3728 struct plt_entry *local_plt;
3729 Elf_Internal_Sym *isym;
3730 Elf_Internal_Shdr *symtab_hdr;
3731
3732 symtab_hdr = &elf_symtab_hdr (ibfd);
3733
3734 local_plt = elf_s390_local_plt (ibfd);
3735 if (local_plt != NULL)
3736 for (i = 0; i < symtab_hdr->sh_info; i++)
3737 {
3738 if (local_plt[i].plt.offset != (bfd_vma) -1)
3739 {
3740 asection *sec = local_plt[i].sec;
3741 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3742 if (isym == NULL)
3743 return FALSE;
3744
3745 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3746 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3747 local_plt[i].plt.offset,
3748 isym->st_value
3749 + sec->output_section->vma
3750 + sec->output_offset);
3751
3752 }
3753 }
3754 }
3755
3756 return TRUE;
3757 }
3758
3759 /* Return address for Ith PLT stub in section PLT, for relocation REL
3760 or (bfd_vma) -1 if it should not be included. */
3761
3762 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3763 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3764 const arelent *rel ATTRIBUTE_UNUSED)
3765 {
3766 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3767 }
3768
3769 /* Why was the hash table entry size definition changed from
3770 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3771 this is the only reason for the s390_elf64_size_info structure. */
3772
3773 const struct elf_size_info s390_elf64_size_info =
3774 {
3775 sizeof (Elf64_External_Ehdr),
3776 sizeof (Elf64_External_Phdr),
3777 sizeof (Elf64_External_Shdr),
3778 sizeof (Elf64_External_Rel),
3779 sizeof (Elf64_External_Rela),
3780 sizeof (Elf64_External_Sym),
3781 sizeof (Elf64_External_Dyn),
3782 sizeof (Elf_External_Note),
3783 8, /* hash-table entry size. */
3784 1, /* internal relocations per external relocations. */
3785 64, /* arch_size. */
3786 3, /* log_file_align. */
3787 ELFCLASS64, EV_CURRENT,
3788 bfd_elf64_write_out_phdrs,
3789 bfd_elf64_write_shdrs_and_ehdr,
3790 bfd_elf64_checksum_contents,
3791 bfd_elf64_write_relocs,
3792 bfd_elf64_swap_symbol_in,
3793 bfd_elf64_swap_symbol_out,
3794 bfd_elf64_slurp_reloc_table,
3795 bfd_elf64_slurp_symbol_table,
3796 bfd_elf64_swap_dyn_in,
3797 bfd_elf64_swap_dyn_out,
3798 bfd_elf64_swap_reloc_in,
3799 bfd_elf64_swap_reloc_out,
3800 bfd_elf64_swap_reloca_in,
3801 bfd_elf64_swap_reloca_out
3802 };
3803
3804 #define TARGET_BIG_SYM s390_elf64_vec
3805 #define TARGET_BIG_NAME "elf64-s390"
3806 #define ELF_ARCH bfd_arch_s390
3807 #define ELF_TARGET_ID S390_ELF_DATA
3808 #define ELF_MACHINE_CODE EM_S390
3809 #define ELF_MACHINE_ALT1 EM_S390_OLD
3810 #define ELF_MAXPAGESIZE 0x1000
3811
3812 #define elf_backend_size_info s390_elf64_size_info
3813
3814 #define elf_backend_can_gc_sections 1
3815 #define elf_backend_can_refcount 1
3816 #define elf_backend_want_got_plt 1
3817 #define elf_backend_plt_readonly 1
3818 #define elf_backend_want_plt_sym 0
3819 #define elf_backend_got_header_size 24
3820 #define elf_backend_rela_normal 1
3821
3822 #define elf_info_to_howto elf_s390_info_to_howto
3823
3824 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3825 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3826 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3827 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3828
3829 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3830 #define elf_backend_check_relocs elf_s390_check_relocs
3831 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3832 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3833 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3834 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3835 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3836 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3837 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3838 #define elf_backend_relocate_section elf_s390_relocate_section
3839 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3840 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3841 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3842 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
3843
3844 #define bfd_elf64_mkobject elf_s390_mkobject
3845 #define elf_backend_object_p elf_s390_object_p
3846
3847 /* Enable ELF64 archive functions. */
3848 #define bfd_elf64_archive_functions
3849 extern bfd_boolean bfd_elf64_archive_slurp_armap (bfd *);
3850 extern bfd_boolean bfd_elf64_archive_write_armap (bfd *, unsigned int, struct orl *, unsigned int, int);
3851
3852 #define bfd_elf64_archive_slurp_extended_name_table _bfd_archive_coff_slurp_extended_name_table
3853 #define bfd_elf64_archive_construct_extended_name_table _bfd_archive_coff_construct_extended_name_table
3854 #define bfd_elf64_archive_truncate_arname _bfd_archive_coff_truncate_arname
3855 #define bfd_elf64_archive_read_ar_hdr _bfd_archive_coff_read_ar_hdr
3856 #define bfd_elf64_archive_write_ar_hdr _bfd_archive_coff_write_ar_hdr
3857 #define bfd_elf64_archive_openr_next_archived_file _bfd_archive_coff_openr_next_archived_file
3858 #define bfd_elf64_archive_get_elt_at_index _bfd_archive_coff_get_elt_at_index
3859 #define bfd_elf64_archive_generic_stat_arch_elt _bfd_archive_coff_generic_stat_arch_elt
3860 #define bfd_elf64_archive_update_armap_timestamp _bfd_archive_coff_update_armap_timestamp
3861
3862 #include "elf64-target.h"
3863