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[deliverable/binutils-gdb.git] / bfd / elf64-s390.c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright (C) 2000-2016 Free Software Foundation, Inc.
3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/s390.h"
28 #include <stdarg.h>
29
30 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
31 from smaller values. Start with zero, widen, *then* decrement. */
32 #define MINUS_ONE (((bfd_vma)0) - 1)
33
34 static bfd_reloc_status_type
35 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
36 asection *, bfd *, char **);
37 static bfd_reloc_status_type
38 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
39 asection *, bfd *, char **);
40
41 /* The relocation "howto" table. */
42 static reloc_howto_type elf_howto_table[] =
43 {
44 HOWTO (R_390_NONE, /* type */
45 0, /* rightshift */
46 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
47 0, /* bitsize */
48 FALSE, /* pc_relative */
49 0, /* bitpos */
50 complain_overflow_dont, /* complain_on_overflow */
51 bfd_elf_generic_reloc, /* special_function */
52 "R_390_NONE", /* name */
53 FALSE, /* partial_inplace */
54 0, /* src_mask */
55 0, /* dst_mask */
56 FALSE), /* pcrel_offset */
57
58 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
60 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
61 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
62 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
64 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
66 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
68 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
70 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
72 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
74 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
76 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
78 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
80 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
82 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
84 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
86 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
88 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
90 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
92 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
94 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
96 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
98 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
100 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
102 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
104 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
106 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
108 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
110 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
112 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
114 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
115 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
116 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
118 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
120 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
122 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
124 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
126 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
128 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
130 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
131 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
132 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
133 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
134 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
136 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
137 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
139 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
140 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
141 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
142 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
144 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
145 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
147 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
148 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
150 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
152 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
153 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
154 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
155 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
156 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
158 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
160 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
162 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
164 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
165 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
166 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
167 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
168 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
169 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
170 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
171 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
172 HOWTO(R_390_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, MINUS_ONE, FALSE),
174 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE),
176 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE),
178 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE),
180 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE),
182 };
183
184 /* GNU extension to record C++ vtable hierarchy. */
185 static reloc_howto_type elf64_s390_vtinherit_howto =
186 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
187 static reloc_howto_type elf64_s390_vtentry_howto =
188 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);
189
190 static reloc_howto_type *
191 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
192 bfd_reloc_code_real_type code)
193 {
194 switch (code)
195 {
196 case BFD_RELOC_NONE:
197 return &elf_howto_table[(int) R_390_NONE];
198 case BFD_RELOC_8:
199 return &elf_howto_table[(int) R_390_8];
200 case BFD_RELOC_390_12:
201 return &elf_howto_table[(int) R_390_12];
202 case BFD_RELOC_16:
203 return &elf_howto_table[(int) R_390_16];
204 case BFD_RELOC_32:
205 return &elf_howto_table[(int) R_390_32];
206 case BFD_RELOC_CTOR:
207 return &elf_howto_table[(int) R_390_32];
208 case BFD_RELOC_32_PCREL:
209 return &elf_howto_table[(int) R_390_PC32];
210 case BFD_RELOC_390_GOT12:
211 return &elf_howto_table[(int) R_390_GOT12];
212 case BFD_RELOC_32_GOT_PCREL:
213 return &elf_howto_table[(int) R_390_GOT32];
214 case BFD_RELOC_390_PLT32:
215 return &elf_howto_table[(int) R_390_PLT32];
216 case BFD_RELOC_390_COPY:
217 return &elf_howto_table[(int) R_390_COPY];
218 case BFD_RELOC_390_GLOB_DAT:
219 return &elf_howto_table[(int) R_390_GLOB_DAT];
220 case BFD_RELOC_390_JMP_SLOT:
221 return &elf_howto_table[(int) R_390_JMP_SLOT];
222 case BFD_RELOC_390_RELATIVE:
223 return &elf_howto_table[(int) R_390_RELATIVE];
224 case BFD_RELOC_32_GOTOFF:
225 return &elf_howto_table[(int) R_390_GOTOFF32];
226 case BFD_RELOC_390_GOTPC:
227 return &elf_howto_table[(int) R_390_GOTPC];
228 case BFD_RELOC_390_GOT16:
229 return &elf_howto_table[(int) R_390_GOT16];
230 case BFD_RELOC_16_PCREL:
231 return &elf_howto_table[(int) R_390_PC16];
232 case BFD_RELOC_390_PC12DBL:
233 return &elf_howto_table[(int) R_390_PC12DBL];
234 case BFD_RELOC_390_PLT12DBL:
235 return &elf_howto_table[(int) R_390_PLT12DBL];
236 case BFD_RELOC_390_PC16DBL:
237 return &elf_howto_table[(int) R_390_PC16DBL];
238 case BFD_RELOC_390_PLT16DBL:
239 return &elf_howto_table[(int) R_390_PLT16DBL];
240 case BFD_RELOC_390_PC24DBL:
241 return &elf_howto_table[(int) R_390_PC24DBL];
242 case BFD_RELOC_390_PLT24DBL:
243 return &elf_howto_table[(int) R_390_PLT24DBL];
244 case BFD_RELOC_390_PC32DBL:
245 return &elf_howto_table[(int) R_390_PC32DBL];
246 case BFD_RELOC_390_PLT32DBL:
247 return &elf_howto_table[(int) R_390_PLT32DBL];
248 case BFD_RELOC_390_GOTPCDBL:
249 return &elf_howto_table[(int) R_390_GOTPCDBL];
250 case BFD_RELOC_64:
251 return &elf_howto_table[(int) R_390_64];
252 case BFD_RELOC_64_PCREL:
253 return &elf_howto_table[(int) R_390_PC64];
254 case BFD_RELOC_390_GOT64:
255 return &elf_howto_table[(int) R_390_GOT64];
256 case BFD_RELOC_390_PLT64:
257 return &elf_howto_table[(int) R_390_PLT64];
258 case BFD_RELOC_390_GOTENT:
259 return &elf_howto_table[(int) R_390_GOTENT];
260 case BFD_RELOC_16_GOTOFF:
261 return &elf_howto_table[(int) R_390_GOTOFF16];
262 case BFD_RELOC_390_GOTOFF64:
263 return &elf_howto_table[(int) R_390_GOTOFF64];
264 case BFD_RELOC_390_GOTPLT12:
265 return &elf_howto_table[(int) R_390_GOTPLT12];
266 case BFD_RELOC_390_GOTPLT16:
267 return &elf_howto_table[(int) R_390_GOTPLT16];
268 case BFD_RELOC_390_GOTPLT32:
269 return &elf_howto_table[(int) R_390_GOTPLT32];
270 case BFD_RELOC_390_GOTPLT64:
271 return &elf_howto_table[(int) R_390_GOTPLT64];
272 case BFD_RELOC_390_GOTPLTENT:
273 return &elf_howto_table[(int) R_390_GOTPLTENT];
274 case BFD_RELOC_390_PLTOFF16:
275 return &elf_howto_table[(int) R_390_PLTOFF16];
276 case BFD_RELOC_390_PLTOFF32:
277 return &elf_howto_table[(int) R_390_PLTOFF32];
278 case BFD_RELOC_390_PLTOFF64:
279 return &elf_howto_table[(int) R_390_PLTOFF64];
280 case BFD_RELOC_390_TLS_LOAD:
281 return &elf_howto_table[(int) R_390_TLS_LOAD];
282 case BFD_RELOC_390_TLS_GDCALL:
283 return &elf_howto_table[(int) R_390_TLS_GDCALL];
284 case BFD_RELOC_390_TLS_LDCALL:
285 return &elf_howto_table[(int) R_390_TLS_LDCALL];
286 case BFD_RELOC_390_TLS_GD64:
287 return &elf_howto_table[(int) R_390_TLS_GD64];
288 case BFD_RELOC_390_TLS_GOTIE12:
289 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
290 case BFD_RELOC_390_TLS_GOTIE64:
291 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
292 case BFD_RELOC_390_TLS_LDM64:
293 return &elf_howto_table[(int) R_390_TLS_LDM64];
294 case BFD_RELOC_390_TLS_IE64:
295 return &elf_howto_table[(int) R_390_TLS_IE64];
296 case BFD_RELOC_390_TLS_IEENT:
297 return &elf_howto_table[(int) R_390_TLS_IEENT];
298 case BFD_RELOC_390_TLS_LE64:
299 return &elf_howto_table[(int) R_390_TLS_LE64];
300 case BFD_RELOC_390_TLS_LDO64:
301 return &elf_howto_table[(int) R_390_TLS_LDO64];
302 case BFD_RELOC_390_TLS_DTPMOD:
303 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
304 case BFD_RELOC_390_TLS_DTPOFF:
305 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
306 case BFD_RELOC_390_TLS_TPOFF:
307 return &elf_howto_table[(int) R_390_TLS_TPOFF];
308 case BFD_RELOC_390_20:
309 return &elf_howto_table[(int) R_390_20];
310 case BFD_RELOC_390_GOT20:
311 return &elf_howto_table[(int) R_390_GOT20];
312 case BFD_RELOC_390_GOTPLT20:
313 return &elf_howto_table[(int) R_390_GOTPLT20];
314 case BFD_RELOC_390_TLS_GOTIE20:
315 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
316 case BFD_RELOC_390_IRELATIVE:
317 return &elf_howto_table[(int) R_390_IRELATIVE];
318 case BFD_RELOC_VTABLE_INHERIT:
319 return &elf64_s390_vtinherit_howto;
320 case BFD_RELOC_VTABLE_ENTRY:
321 return &elf64_s390_vtentry_howto;
322 default:
323 break;
324 }
325 return 0;
326 }
327
328 static reloc_howto_type *
329 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
330 const char *r_name)
331 {
332 unsigned int i;
333
334 for (i = 0;
335 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
336 i++)
337 if (elf_howto_table[i].name != NULL
338 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
339 return &elf_howto_table[i];
340
341 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
342 return &elf64_s390_vtinherit_howto;
343 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
344 return &elf64_s390_vtentry_howto;
345
346 return NULL;
347 }
348
349 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
350 and elf64-s390.c has its own copy. */
351
352 static void
353 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
354 arelent *cache_ptr,
355 Elf_Internal_Rela *dst)
356 {
357 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
358 switch (r_type)
359 {
360 case R_390_GNU_VTINHERIT:
361 cache_ptr->howto = &elf64_s390_vtinherit_howto;
362 break;
363
364 case R_390_GNU_VTENTRY:
365 cache_ptr->howto = &elf64_s390_vtentry_howto;
366 break;
367
368 default:
369 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
370 {
371 /* xgettext:c-format */
372 _bfd_error_handler (_("%B: invalid relocation type %d"),
373 abfd, (int) r_type);
374 r_type = R_390_NONE;
375 }
376 cache_ptr->howto = &elf_howto_table[r_type];
377 }
378 }
379
380 /* A relocation function which doesn't do anything. */
381 static bfd_reloc_status_type
382 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
383 arelent *reloc_entry,
384 asymbol *symbol ATTRIBUTE_UNUSED,
385 void * data ATTRIBUTE_UNUSED,
386 asection *input_section,
387 bfd *output_bfd,
388 char **error_message ATTRIBUTE_UNUSED)
389 {
390 if (output_bfd)
391 reloc_entry->address += input_section->output_offset;
392 return bfd_reloc_ok;
393 }
394
395 /* Handle the large displacement relocs. */
396 static bfd_reloc_status_type
397 s390_elf_ldisp_reloc (bfd *abfd,
398 arelent *reloc_entry,
399 asymbol *symbol,
400 void * data,
401 asection *input_section,
402 bfd *output_bfd,
403 char **error_message ATTRIBUTE_UNUSED)
404 {
405 reloc_howto_type *howto = reloc_entry->howto;
406 bfd_vma relocation;
407 bfd_vma insn;
408
409 if (output_bfd != (bfd *) NULL
410 && (symbol->flags & BSF_SECTION_SYM) == 0
411 && (! howto->partial_inplace
412 || reloc_entry->addend == 0))
413 {
414 reloc_entry->address += input_section->output_offset;
415 return bfd_reloc_ok;
416 }
417 if (output_bfd != NULL)
418 return bfd_reloc_continue;
419
420 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
421 return bfd_reloc_outofrange;
422
423 relocation = (symbol->value
424 + symbol->section->output_section->vma
425 + symbol->section->output_offset);
426 relocation += reloc_entry->addend;
427 if (howto->pc_relative)
428 {
429 relocation -= (input_section->output_section->vma
430 + input_section->output_offset);
431 relocation -= reloc_entry->address;
432 }
433
434 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
435 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
436 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
437
438 if ((bfd_signed_vma) relocation < - 0x80000
439 || (bfd_signed_vma) relocation > 0x7ffff)
440 return bfd_reloc_overflow;
441 else
442 return bfd_reloc_ok;
443 }
444
445 static bfd_boolean
446 elf_s390_is_local_label_name (bfd *abfd, const char *name)
447 {
448 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
449 return TRUE;
450
451 return _bfd_elf_is_local_label_name (abfd, name);
452 }
453
454 /* Functions for the 390 ELF linker. */
455
456 /* The name of the dynamic interpreter. This is put in the .interp
457 section. */
458
459 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
460
461 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
462 copying dynamic variables from a shared lib into an app's dynbss
463 section, and instead use a dynamic relocation to point into the
464 shared lib. */
465 #define ELIMINATE_COPY_RELOCS 1
466
467 /* The size in bytes of the first entry in the procedure linkage table. */
468 #define PLT_FIRST_ENTRY_SIZE 32
469 /* The size in bytes of an entry in the procedure linkage table. */
470 #define PLT_ENTRY_SIZE 32
471
472 #define GOT_ENTRY_SIZE 8
473
474 #define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela)
475
476 /* The first three entries in a procedure linkage table are reserved,
477 and the initial contents are unimportant (we zero them out).
478 Subsequent entries look like this. See the SVR4 ABI 386
479 supplement to see how this works. */
480
481 /* For the s390, simple addr offset can only be 0 - 4096.
482 To use the full 16777216 TB address space, several instructions
483 are needed to load an address in a register and execute
484 a branch( or just saving the address)
485
486 Furthermore, only r 0 and 1 are free to use!!! */
487
488 /* The first 3 words in the GOT are then reserved.
489 Word 0 is the address of the dynamic table.
490 Word 1 is a pointer to a structure describing the object
491 Word 2 is used to point to the loader entry address.
492
493 The code for PLT entries looks like this:
494
495 The GOT holds the address in the PLT to be executed.
496 The loader then gets:
497 48(15) = Pointer to the structure describing the object.
498 56(15) = Offset in symbol table
499 The loader must then find the module where the function is
500 and insert the address in the GOT.
501
502 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
503 LG 1,0(1) # 6 bytes Load address from GOT in r1
504 BCR 15,1 # 2 bytes Jump to address
505 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
506 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
507 BRCL 15,-x # 6 bytes Jump to start of PLT
508 .long ? # 4 bytes offset into .rela.plt
509
510 Total = 32 bytes per PLT entry
511 Fixup at offset 2: relative address to GOT entry
512 Fixup at offset 22: relative branch to PLT0
513 Fixup at offset 28: 32 bit offset into .rela.plt
514
515 A 32 bit offset into the symbol table is enough. It allows for
516 .rela.plt sections up to a size of 2 gigabyte. A single dynamic
517 object (the main program, any shared library) is limited to 4GB in
518 size. Having a .rela.plt of 2GB would already make the .plt
519 section bigger than 8GB. */
520
521 static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] =
522 {
523 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
524 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, /* lg %r1,0(%r1) */
525 0x07, 0xf1, /* br %r1 */
526 0x0d, 0x10, /* basr %r1,%r0 */
527 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, /* lgf %r1,12(%r1) */
528 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, /* jg first plt */
529 0x00, 0x00, 0x00, 0x00 /* .long 0x00000000 */
530 };
531
532 /* The first PLT entry pushes the offset into the symbol table
533 from R1 onto the stack at 56(15) and the loader object info
534 at 48(15), loads the loader address in R1 and jumps to it. */
535
536 /* The first entry in the PLT:
537
538 PLT0:
539 STG 1,56(15) # r1 contains the offset into the symbol table
540 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
541 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
542 LG 1,16(1) # get entry address of loader
543 BCR 15,1 # jump to loader
544
545 Fixup at offset 8: relative address to start of GOT. */
546
547 static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] =
548 {
549 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, /* stg %r1,56(%r15) */
550 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */
551 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, /* mvc 48(8,%r15),8(%r1) */
552 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, /* lg %r1,16(%r1) */
553 0x07, 0xf1, /* br %r1 */
554 0x07, 0x00, /* nopr %r0 */
555 0x07, 0x00, /* nopr %r0 */
556 0x07, 0x00 /* nopr %r0 */
557 };
558
559
560 /* s390 ELF linker hash entry. */
561
562 struct elf_s390_link_hash_entry
563 {
564 struct elf_link_hash_entry elf;
565
566 /* Track dynamic relocs copied for this symbol. */
567 struct elf_dyn_relocs *dyn_relocs;
568
569 /* Number of GOTPLT references for a function. */
570 bfd_signed_vma gotplt_refcount;
571
572 #define GOT_UNKNOWN 0
573 #define GOT_NORMAL 1
574 #define GOT_TLS_GD 2
575 #define GOT_TLS_IE 3
576 #define GOT_TLS_IE_NLT 3
577 unsigned char tls_type;
578
579 /* For pointer equality reasons we might need to change the symbol
580 type from STT_GNU_IFUNC to STT_FUNC together with its value and
581 section entry. So after alloc_dynrelocs only these values should
582 be used. In order to check whether a symbol is IFUNC use
583 s390_is_ifunc_symbol_p. */
584 bfd_vma ifunc_resolver_address;
585 asection *ifunc_resolver_section;
586 };
587
588 #define elf_s390_hash_entry(ent) \
589 ((struct elf_s390_link_hash_entry *)(ent))
590
591 /* This structure represents an entry in the local PLT list needed for
592 local IFUNC symbols. */
593 struct plt_entry
594 {
595 /* The section of the local symbol.
596 Set in relocate_section and used in finish_dynamic_sections. */
597 asection *sec;
598
599 union
600 {
601 bfd_signed_vma refcount;
602 bfd_vma offset;
603 } plt;
604 };
605
606 /* NOTE: Keep this structure in sync with
607 the one declared in elf32-s390.c. */
608 struct elf_s390_obj_tdata
609 {
610 struct elf_obj_tdata root;
611
612 /* A local PLT is needed for ifunc symbols. */
613 struct plt_entry *local_plt;
614
615 /* TLS type for each local got entry. */
616 char *local_got_tls_type;
617 };
618
619 #define elf_s390_tdata(abfd) \
620 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
621
622 #define elf_s390_local_plt(abfd) \
623 (elf_s390_tdata (abfd)->local_plt)
624
625 #define elf_s390_local_got_tls_type(abfd) \
626 (elf_s390_tdata (abfd)->local_got_tls_type)
627
628 #define is_s390_elf(bfd) \
629 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
630 && elf_tdata (bfd) != NULL \
631 && elf_object_id (bfd) == S390_ELF_DATA)
632
633 static bfd_boolean
634 elf_s390_mkobject (bfd *abfd)
635 {
636 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
637 S390_ELF_DATA);
638 }
639
640 static bfd_boolean
641 elf_s390_object_p (bfd *abfd)
642 {
643 /* Set the right machine number for an s390 elf32 file. */
644 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
645 }
646
647 /* s390 ELF linker hash table. */
648
649 struct elf_s390_link_hash_table
650 {
651 struct elf_link_hash_table elf;
652
653 /* Short-cuts to get to dynamic linker sections. */
654 asection *sdynbss;
655 asection *srelbss;
656 asection *irelifunc;
657
658 union {
659 bfd_signed_vma refcount;
660 bfd_vma offset;
661 } tls_ldm_got;
662
663 /* Small local sym cache. */
664 struct sym_cache sym_cache;
665 };
666
667 /* Get the s390 ELF linker hash table from a link_info structure. */
668
669 #define elf_s390_hash_table(p) \
670 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
671 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
672
673 #define ELF64 1
674 #include "elf-s390-common.c"
675
676 /* Create an entry in an s390 ELF linker hash table. */
677
678 static struct bfd_hash_entry *
679 link_hash_newfunc (struct bfd_hash_entry *entry,
680 struct bfd_hash_table *table,
681 const char *string)
682 {
683 /* Allocate the structure if it has not already been allocated by a
684 subclass. */
685 if (entry == NULL)
686 {
687 entry = bfd_hash_allocate (table,
688 sizeof (struct elf_s390_link_hash_entry));
689 if (entry == NULL)
690 return entry;
691 }
692
693 /* Call the allocation method of the superclass. */
694 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
695 if (entry != NULL)
696 {
697 struct elf_s390_link_hash_entry *eh;
698
699 eh = (struct elf_s390_link_hash_entry *) entry;
700 eh->dyn_relocs = NULL;
701 eh->gotplt_refcount = 0;
702 eh->tls_type = GOT_UNKNOWN;
703 eh->ifunc_resolver_address = 0;
704 eh->ifunc_resolver_section = NULL;
705 }
706
707 return entry;
708 }
709
710 /* Create an s390 ELF linker hash table. */
711
712 static struct bfd_link_hash_table *
713 elf_s390_link_hash_table_create (bfd *abfd)
714 {
715 struct elf_s390_link_hash_table *ret;
716 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
717
718 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
719 if (ret == NULL)
720 return NULL;
721
722 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
723 sizeof (struct elf_s390_link_hash_entry),
724 S390_ELF_DATA))
725 {
726 free (ret);
727 return NULL;
728 }
729
730 return &ret->elf.root;
731 }
732
733 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
734 shortcuts to them in our hash table. */
735
736 static bfd_boolean
737 create_got_section (bfd *dynobj,
738 struct bfd_link_info *info)
739 {
740 struct elf_s390_link_hash_table *htab;
741
742 if (! _bfd_elf_create_got_section (dynobj, info))
743 return FALSE;
744
745 htab = elf_s390_hash_table (info);
746 if (htab == NULL)
747 return FALSE;
748
749 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
750 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
751 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
752 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
753 abort ();
754 return TRUE;
755 }
756
757 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
758 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
759 hash table. */
760
761 static bfd_boolean
762 elf_s390_create_dynamic_sections (bfd *dynobj,
763 struct bfd_link_info *info)
764 {
765 struct elf_s390_link_hash_table *htab;
766
767 htab = elf_s390_hash_table (info);
768 if (htab == NULL)
769 return FALSE;
770
771 if (!htab->elf.sgot && !create_got_section (dynobj, info))
772 return FALSE;
773
774 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
775 return FALSE;
776
777 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
778 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
779 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
780 if (!bfd_link_pic (info))
781 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
782
783 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
784 || (!bfd_link_pic (info) && !htab->srelbss))
785 abort ();
786
787 return TRUE;
788 }
789
790 /* Copy the extra info we tack onto an elf_link_hash_entry. */
791
792 static void
793 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
794 struct elf_link_hash_entry *dir,
795 struct elf_link_hash_entry *ind)
796 {
797 struct elf_s390_link_hash_entry *edir, *eind;
798
799 edir = (struct elf_s390_link_hash_entry *) dir;
800 eind = (struct elf_s390_link_hash_entry *) ind;
801
802 if (eind->dyn_relocs != NULL)
803 {
804 if (edir->dyn_relocs != NULL)
805 {
806 struct elf_dyn_relocs **pp;
807 struct elf_dyn_relocs *p;
808
809 /* Add reloc counts against the indirect sym to the direct sym
810 list. Merge any entries against the same section. */
811 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
812 {
813 struct elf_dyn_relocs *q;
814
815 for (q = edir->dyn_relocs; q != NULL; q = q->next)
816 if (q->sec == p->sec)
817 {
818 q->pc_count += p->pc_count;
819 q->count += p->count;
820 *pp = p->next;
821 break;
822 }
823 if (q == NULL)
824 pp = &p->next;
825 }
826 *pp = edir->dyn_relocs;
827 }
828
829 edir->dyn_relocs = eind->dyn_relocs;
830 eind->dyn_relocs = NULL;
831 }
832
833 if (ind->root.type == bfd_link_hash_indirect
834 && dir->got.refcount <= 0)
835 {
836 edir->tls_type = eind->tls_type;
837 eind->tls_type = GOT_UNKNOWN;
838 }
839
840 if (ELIMINATE_COPY_RELOCS
841 && ind->root.type != bfd_link_hash_indirect
842 && dir->dynamic_adjusted)
843 {
844 /* If called to transfer flags for a weakdef during processing
845 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
846 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
847 dir->ref_dynamic |= ind->ref_dynamic;
848 dir->ref_regular |= ind->ref_regular;
849 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
850 dir->needs_plt |= ind->needs_plt;
851 }
852 else
853 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
854 }
855
856 static int
857 elf_s390_tls_transition (struct bfd_link_info *info,
858 int r_type,
859 int is_local)
860 {
861 if (bfd_link_pic (info))
862 return r_type;
863
864 switch (r_type)
865 {
866 case R_390_TLS_GD64:
867 case R_390_TLS_IE64:
868 if (is_local)
869 return R_390_TLS_LE64;
870 return R_390_TLS_IE64;
871 case R_390_TLS_GOTIE64:
872 if (is_local)
873 return R_390_TLS_LE64;
874 return R_390_TLS_GOTIE64;
875 case R_390_TLS_LDM64:
876 return R_390_TLS_LE64;
877 }
878
879 return r_type;
880 }
881
882 /* Look through the relocs for a section during the first phase, and
883 allocate space in the global offset table or procedure linkage
884 table. */
885
886 static bfd_boolean
887 elf_s390_check_relocs (bfd *abfd,
888 struct bfd_link_info *info,
889 asection *sec,
890 const Elf_Internal_Rela *relocs)
891 {
892 struct elf_s390_link_hash_table *htab;
893 Elf_Internal_Shdr *symtab_hdr;
894 struct elf_link_hash_entry **sym_hashes;
895 const Elf_Internal_Rela *rel;
896 const Elf_Internal_Rela *rel_end;
897 asection *sreloc;
898 bfd_signed_vma *local_got_refcounts;
899 int tls_type, old_tls_type;
900
901 if (bfd_link_relocatable (info))
902 return TRUE;
903
904 BFD_ASSERT (is_s390_elf (abfd));
905
906 htab = elf_s390_hash_table (info);
907 if (htab == NULL)
908 return FALSE;
909
910 symtab_hdr = &elf_symtab_hdr (abfd);
911 sym_hashes = elf_sym_hashes (abfd);
912 local_got_refcounts = elf_local_got_refcounts (abfd);
913
914 sreloc = NULL;
915
916 rel_end = relocs + sec->reloc_count;
917 for (rel = relocs; rel < rel_end; rel++)
918 {
919 unsigned int r_type;
920 unsigned long r_symndx;
921 struct elf_link_hash_entry *h;
922 Elf_Internal_Sym *isym;
923
924 r_symndx = ELF64_R_SYM (rel->r_info);
925
926 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
927 {
928 /* xgettext:c-format */
929 _bfd_error_handler (_("%B: bad symbol index: %d"),
930 abfd, r_symndx);
931 return FALSE;
932 }
933
934 if (r_symndx < symtab_hdr->sh_info)
935 {
936 /* A local symbol. */
937 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
938 abfd, r_symndx);
939 if (isym == NULL)
940 return FALSE;
941
942 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
943 {
944 struct plt_entry *plt;
945
946 if (htab->elf.dynobj == NULL)
947 htab->elf.dynobj = abfd;
948
949 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
950 return FALSE;
951
952 if (local_got_refcounts == NULL)
953 {
954 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
955 return FALSE;
956 local_got_refcounts = elf_local_got_refcounts (abfd);
957 }
958 plt = elf_s390_local_plt (abfd);
959 plt[r_symndx].plt.refcount++;
960 }
961 h = NULL;
962 }
963 else
964 {
965 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
966 while (h->root.type == bfd_link_hash_indirect
967 || h->root.type == bfd_link_hash_warning)
968 h = (struct elf_link_hash_entry *) h->root.u.i.link;
969
970 /* PR15323, ref flags aren't set for references in the same
971 object. */
972 h->root.non_ir_ref = 1;
973 }
974
975 /* Create got section and local_got_refcounts array if they
976 are needed. */
977 r_type = elf_s390_tls_transition (info,
978 ELF64_R_TYPE (rel->r_info),
979 h == NULL);
980 switch (r_type)
981 {
982 case R_390_GOT12:
983 case R_390_GOT16:
984 case R_390_GOT20:
985 case R_390_GOT32:
986 case R_390_GOT64:
987 case R_390_GOTENT:
988 case R_390_GOTPLT12:
989 case R_390_GOTPLT16:
990 case R_390_GOTPLT20:
991 case R_390_GOTPLT32:
992 case R_390_GOTPLT64:
993 case R_390_GOTPLTENT:
994 case R_390_TLS_GD64:
995 case R_390_TLS_GOTIE12:
996 case R_390_TLS_GOTIE20:
997 case R_390_TLS_GOTIE64:
998 case R_390_TLS_IEENT:
999 case R_390_TLS_IE64:
1000 case R_390_TLS_LDM64:
1001 if (h == NULL
1002 && local_got_refcounts == NULL)
1003 {
1004 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1005 return FALSE;
1006 local_got_refcounts = elf_local_got_refcounts (abfd);
1007 }
1008
1009 /* Fall through. */
1010 case R_390_GOTOFF16:
1011 case R_390_GOTOFF32:
1012 case R_390_GOTOFF64:
1013 case R_390_GOTPC:
1014 case R_390_GOTPCDBL:
1015 if (htab->elf.sgot == NULL)
1016 {
1017 if (htab->elf.dynobj == NULL)
1018 htab->elf.dynobj = abfd;
1019 if (!create_got_section (htab->elf.dynobj, info))
1020 return FALSE;
1021 }
1022 }
1023
1024 if (h != NULL)
1025 {
1026 if (htab->elf.dynobj == NULL)
1027 htab->elf.dynobj = abfd;
1028 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1029 return FALSE;
1030
1031 /* Make sure an IFUNC symbol defined in a non-shared object
1032 always gets a PLT slot. */
1033 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1034 {
1035 /* The symbol is called by the dynamic loader in order
1036 to resolve the relocation. So it is in fact also
1037 referenced. */
1038 h->ref_regular = 1;
1039 h->needs_plt = 1;
1040 }
1041 }
1042
1043 switch (r_type)
1044 {
1045 case R_390_GOTPC:
1046 case R_390_GOTPCDBL:
1047 /* These relocs do not need a GOT slot. They just load the
1048 GOT pointer itself or address something else relative to
1049 the GOT. Since the GOT pointer has been set up above we
1050 are done. */
1051 break;
1052 case R_390_GOTOFF16:
1053 case R_390_GOTOFF32:
1054 case R_390_GOTOFF64:
1055 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
1056 break;
1057 /* Fall through. */
1058
1059 case R_390_PLT12DBL:
1060 case R_390_PLT16DBL:
1061 case R_390_PLT24DBL:
1062 case R_390_PLT32:
1063 case R_390_PLT32DBL:
1064 case R_390_PLT64:
1065 case R_390_PLTOFF16:
1066 case R_390_PLTOFF32:
1067 case R_390_PLTOFF64:
1068 /* This symbol requires a procedure linkage table entry. We
1069 actually build the entry in adjust_dynamic_symbol,
1070 because this might be a case of linking PIC code which is
1071 never referenced by a dynamic object, in which case we
1072 don't need to generate a procedure linkage table entry
1073 after all. */
1074
1075 /* If this is a local symbol, we resolve it directly without
1076 creating a procedure linkage table entry. */
1077 if (h != NULL)
1078 {
1079 h->needs_plt = 1;
1080 h->plt.refcount += 1;
1081 }
1082 break;
1083
1084 case R_390_GOTPLT12:
1085 case R_390_GOTPLT16:
1086 case R_390_GOTPLT20:
1087 case R_390_GOTPLT32:
1088 case R_390_GOTPLT64:
1089 case R_390_GOTPLTENT:
1090 /* This symbol requires either a procedure linkage table entry
1091 or an entry in the local got. We actually build the entry
1092 in adjust_dynamic_symbol because whether this is really a
1093 global reference can change and with it the fact if we have
1094 to create a plt entry or a local got entry. To be able to
1095 make a once global symbol a local one we have to keep track
1096 of the number of gotplt references that exist for this
1097 symbol. */
1098 if (h != NULL)
1099 {
1100 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1101 h->needs_plt = 1;
1102 h->plt.refcount += 1;
1103 }
1104 else
1105 local_got_refcounts[r_symndx] += 1;
1106 break;
1107
1108 case R_390_TLS_LDM64:
1109 htab->tls_ldm_got.refcount += 1;
1110 break;
1111
1112 case R_390_TLS_IE64:
1113 case R_390_TLS_GOTIE12:
1114 case R_390_TLS_GOTIE20:
1115 case R_390_TLS_GOTIE64:
1116 case R_390_TLS_IEENT:
1117 if (bfd_link_pic (info))
1118 info->flags |= DF_STATIC_TLS;
1119 /* Fall through */
1120
1121 case R_390_GOT12:
1122 case R_390_GOT16:
1123 case R_390_GOT20:
1124 case R_390_GOT32:
1125 case R_390_GOT64:
1126 case R_390_GOTENT:
1127 case R_390_TLS_GD64:
1128 /* This symbol requires a global offset table entry. */
1129 switch (r_type)
1130 {
1131 default:
1132 case R_390_GOT12:
1133 case R_390_GOT16:
1134 case R_390_GOT20:
1135 case R_390_GOT32:
1136 case R_390_GOTENT:
1137 tls_type = GOT_NORMAL;
1138 break;
1139 case R_390_TLS_GD64:
1140 tls_type = GOT_TLS_GD;
1141 break;
1142 case R_390_TLS_IE64:
1143 case R_390_TLS_GOTIE64:
1144 tls_type = GOT_TLS_IE;
1145 break;
1146 case R_390_TLS_GOTIE12:
1147 case R_390_TLS_GOTIE20:
1148 case R_390_TLS_IEENT:
1149 tls_type = GOT_TLS_IE_NLT;
1150 break;
1151 }
1152
1153 if (h != NULL)
1154 {
1155 h->got.refcount += 1;
1156 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1157 }
1158 else
1159 {
1160 local_got_refcounts[r_symndx] += 1;
1161 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1162 }
1163 /* If a TLS symbol is accessed using IE at least once,
1164 there is no point to use dynamic model for it. */
1165 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1166 {
1167 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1168 {
1169 _bfd_error_handler
1170 /* xgettext:c-format */
1171 (_("%B: `%s' accessed both as normal and thread local symbol"),
1172 abfd, h->root.root.string);
1173 return FALSE;
1174 }
1175 if (old_tls_type > tls_type)
1176 tls_type = old_tls_type;
1177 }
1178
1179 if (old_tls_type != tls_type)
1180 {
1181 if (h != NULL)
1182 elf_s390_hash_entry (h)->tls_type = tls_type;
1183 else
1184 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1185 }
1186
1187 if (r_type != R_390_TLS_IE64)
1188 break;
1189 /* Fall through */
1190
1191 case R_390_TLS_LE64:
1192 /* For static linking and executables this reloc will be
1193 calculated at linktime otherwise a TLS_TPOFF runtime
1194 reloc will be generated. */
1195 if (r_type == R_390_TLS_LE64 && bfd_link_pie (info))
1196 break;
1197
1198 if (!bfd_link_pic (info))
1199 break;
1200 info->flags |= DF_STATIC_TLS;
1201 /* Fall through */
1202
1203 case R_390_8:
1204 case R_390_16:
1205 case R_390_32:
1206 case R_390_64:
1207 case R_390_PC12DBL:
1208 case R_390_PC16:
1209 case R_390_PC16DBL:
1210 case R_390_PC24DBL:
1211 case R_390_PC32:
1212 case R_390_PC32DBL:
1213 case R_390_PC64:
1214 if (h != NULL && bfd_link_executable (info))
1215 {
1216 /* If this reloc is in a read-only section, we might
1217 need a copy reloc. We can't check reliably at this
1218 stage whether the section is read-only, as input
1219 sections have not yet been mapped to output sections.
1220 Tentatively set the flag for now, and correct in
1221 adjust_dynamic_symbol. */
1222 h->non_got_ref = 1;
1223
1224 if (!bfd_link_pic (info))
1225 {
1226 /* We may need a .plt entry if the function this reloc
1227 refers to is in a shared lib. */
1228 h->plt.refcount += 1;
1229 }
1230 }
1231
1232 /* If we are creating a shared library, and this is a reloc
1233 against a global symbol, or a non PC relative reloc
1234 against a local symbol, then we need to copy the reloc
1235 into the shared library. However, if we are linking with
1236 -Bsymbolic, we do not need to copy a reloc against a
1237 global symbol which is defined in an object we are
1238 including in the link (i.e., DEF_REGULAR is set). At
1239 this point we have not seen all the input files, so it is
1240 possible that DEF_REGULAR is not set now but will be set
1241 later (it is never cleared). In case of a weak definition,
1242 DEF_REGULAR may be cleared later by a strong definition in
1243 a shared library. We account for that possibility below by
1244 storing information in the relocs_copied field of the hash
1245 table entry. A similar situation occurs when creating
1246 shared libraries and symbol visibility changes render the
1247 symbol local.
1248
1249 If on the other hand, we are creating an executable, we
1250 may need to keep relocations for symbols satisfied by a
1251 dynamic library if we manage to avoid copy relocs for the
1252 symbol. */
1253 if ((bfd_link_pic (info)
1254 && (sec->flags & SEC_ALLOC) != 0
1255 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1256 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL
1257 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1258 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL
1259 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1260 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1261 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1262 || (h != NULL
1263 && (! SYMBOLIC_BIND (info, h)
1264 || h->root.type == bfd_link_hash_defweak
1265 || !h->def_regular))))
1266 || (ELIMINATE_COPY_RELOCS
1267 && !bfd_link_pic (info)
1268 && (sec->flags & SEC_ALLOC) != 0
1269 && h != NULL
1270 && (h->root.type == bfd_link_hash_defweak
1271 || !h->def_regular)))
1272 {
1273 struct elf_dyn_relocs *p;
1274 struct elf_dyn_relocs **head;
1275
1276 /* We must copy these reloc types into the output file.
1277 Create a reloc section in dynobj and make room for
1278 this reloc. */
1279 if (sreloc == NULL)
1280 {
1281 if (htab->elf.dynobj == NULL)
1282 htab->elf.dynobj = abfd;
1283
1284 sreloc = _bfd_elf_make_dynamic_reloc_section
1285 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1286
1287 if (sreloc == NULL)
1288 return FALSE;
1289 }
1290
1291 /* If this is a global symbol, we count the number of
1292 relocations we need for this symbol. */
1293 if (h != NULL)
1294 {
1295 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1296 }
1297 else
1298 {
1299 /* Track dynamic relocs needed for local syms too.
1300 We really need local syms available to do this
1301 easily. Oh well. */
1302 asection *s;
1303 void *vpp;
1304
1305 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1306 abfd, r_symndx);
1307 if (isym == NULL)
1308 return FALSE;
1309
1310 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1311 if (s == NULL)
1312 s = sec;
1313
1314 vpp = &elf_section_data (s)->local_dynrel;
1315 head = (struct elf_dyn_relocs **) vpp;
1316 }
1317
1318 p = *head;
1319 if (p == NULL || p->sec != sec)
1320 {
1321 bfd_size_type amt = sizeof *p;
1322 p = ((struct elf_dyn_relocs *)
1323 bfd_alloc (htab->elf.dynobj, amt));
1324 if (p == NULL)
1325 return FALSE;
1326 p->next = *head;
1327 *head = p;
1328 p->sec = sec;
1329 p->count = 0;
1330 p->pc_count = 0;
1331 }
1332
1333 p->count += 1;
1334 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1335 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL
1336 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1337 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1338 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1339 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1340 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1341 p->pc_count += 1;
1342 }
1343 break;
1344
1345 /* This relocation describes the C++ object vtable hierarchy.
1346 Reconstruct it for later use during GC. */
1347 case R_390_GNU_VTINHERIT:
1348 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1349 return FALSE;
1350 break;
1351
1352 /* This relocation describes which C++ vtable entries are actually
1353 used. Record for later use during GC. */
1354 case R_390_GNU_VTENTRY:
1355 BFD_ASSERT (h != NULL);
1356 if (h != NULL
1357 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1358 return FALSE;
1359 break;
1360
1361 default:
1362 break;
1363 }
1364 }
1365
1366 return TRUE;
1367 }
1368
1369 /* Return the section that should be marked against GC for a given
1370 relocation. */
1371
1372 static asection *
1373 elf_s390_gc_mark_hook (asection *sec,
1374 struct bfd_link_info *info,
1375 Elf_Internal_Rela *rel,
1376 struct elf_link_hash_entry *h,
1377 Elf_Internal_Sym *sym)
1378 {
1379 if (h != NULL)
1380 switch (ELF64_R_TYPE (rel->r_info))
1381 {
1382 case R_390_GNU_VTINHERIT:
1383 case R_390_GNU_VTENTRY:
1384 return NULL;
1385 }
1386
1387 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1388 }
1389
1390 /* Update the got entry reference counts for the section being removed. */
1391
1392 static bfd_boolean
1393 elf_s390_gc_sweep_hook (bfd *abfd,
1394 struct bfd_link_info *info,
1395 asection *sec,
1396 const Elf_Internal_Rela *relocs)
1397 {
1398 struct elf_s390_link_hash_table *htab;
1399 Elf_Internal_Shdr *symtab_hdr;
1400 struct elf_link_hash_entry **sym_hashes;
1401 bfd_signed_vma *local_got_refcounts;
1402 const Elf_Internal_Rela *rel, *relend;
1403
1404 if (bfd_link_relocatable (info))
1405 return TRUE;
1406
1407 htab = elf_s390_hash_table (info);
1408 if (htab == NULL)
1409 return FALSE;
1410
1411 elf_section_data (sec)->local_dynrel = NULL;
1412
1413 symtab_hdr = &elf_symtab_hdr (abfd);
1414 sym_hashes = elf_sym_hashes (abfd);
1415 local_got_refcounts = elf_local_got_refcounts (abfd);
1416
1417 relend = relocs + sec->reloc_count;
1418 for (rel = relocs; rel < relend; rel++)
1419 {
1420 unsigned long r_symndx;
1421 unsigned int r_type;
1422 struct elf_link_hash_entry *h = NULL;
1423
1424 r_symndx = ELF64_R_SYM (rel->r_info);
1425 if (r_symndx >= symtab_hdr->sh_info)
1426 {
1427 struct elf_s390_link_hash_entry *eh;
1428 struct elf_dyn_relocs **pp;
1429 struct elf_dyn_relocs *p;
1430
1431 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1432 while (h->root.type == bfd_link_hash_indirect
1433 || h->root.type == bfd_link_hash_warning)
1434 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1435 eh = (struct elf_s390_link_hash_entry *) h;
1436
1437 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1438 if (p->sec == sec)
1439 {
1440 /* Everything must go for SEC. */
1441 *pp = p->next;
1442 break;
1443 }
1444 }
1445 else
1446 {
1447 Elf_Internal_Sym *isym;
1448
1449 /* A local symbol. */
1450 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1451 abfd, r_symndx);
1452 if (isym == NULL)
1453 return FALSE;
1454
1455 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1456 {
1457 struct plt_entry *plt = elf_s390_local_plt (abfd);
1458 if (plt[r_symndx].plt.refcount > 0)
1459 plt[r_symndx].plt.refcount--;
1460 }
1461 }
1462
1463 r_type = ELF64_R_TYPE (rel->r_info);
1464 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1465 switch (r_type)
1466 {
1467 case R_390_TLS_LDM64:
1468 if (htab->tls_ldm_got.refcount > 0)
1469 htab->tls_ldm_got.refcount -= 1;
1470 break;
1471 case R_390_GOTOFF16:
1472 case R_390_GOTOFF32:
1473 case R_390_GOTOFF64:
1474 if (h != NULL && s390_is_ifunc_symbol_p (h) && h->def_regular)
1475 {
1476 h->plt.refcount--;
1477 break;
1478 }
1479
1480 case R_390_GOTPC:
1481 case R_390_GOTPCDBL:
1482 break;
1483
1484 case R_390_TLS_GD64:
1485 case R_390_TLS_IE64:
1486 case R_390_TLS_GOTIE12:
1487 case R_390_TLS_GOTIE20:
1488 case R_390_TLS_GOTIE64:
1489 case R_390_TLS_IEENT:
1490 case R_390_GOT12:
1491 case R_390_GOT16:
1492 case R_390_GOT20:
1493 case R_390_GOT32:
1494 case R_390_GOT64:
1495 case R_390_GOTENT:
1496 if (h != NULL)
1497 {
1498 if (h->got.refcount > 0)
1499 h->got.refcount -= 1;
1500 }
1501 else if (local_got_refcounts != NULL)
1502 {
1503 if (local_got_refcounts[r_symndx] > 0)
1504 local_got_refcounts[r_symndx] -= 1;
1505 }
1506 break;
1507
1508 case R_390_8:
1509 case R_390_12:
1510 case R_390_16:
1511 case R_390_20:
1512 case R_390_32:
1513 case R_390_64:
1514 case R_390_PC16:
1515 case R_390_PC12DBL:
1516 case R_390_PC16DBL:
1517 case R_390_PC24DBL:
1518 case R_390_PC32:
1519 case R_390_PC32DBL:
1520 case R_390_PC64:
1521 if (bfd_link_pic (info))
1522 break;
1523 /* Fall through */
1524
1525 case R_390_PLT12DBL:
1526 case R_390_PLT16DBL:
1527 case R_390_PLT24DBL:
1528 case R_390_PLT32:
1529 case R_390_PLT32DBL:
1530 case R_390_PLT64:
1531 case R_390_PLTOFF16:
1532 case R_390_PLTOFF32:
1533 case R_390_PLTOFF64:
1534 if (h != NULL)
1535 {
1536 if (h->plt.refcount > 0)
1537 h->plt.refcount -= 1;
1538 }
1539 break;
1540
1541 case R_390_GOTPLT12:
1542 case R_390_GOTPLT16:
1543 case R_390_GOTPLT20:
1544 case R_390_GOTPLT32:
1545 case R_390_GOTPLT64:
1546 case R_390_GOTPLTENT:
1547 if (h != NULL)
1548 {
1549 if (h->plt.refcount > 0)
1550 {
1551 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1552 h->plt.refcount -= 1;
1553 }
1554 }
1555 else if (local_got_refcounts != NULL)
1556 {
1557 if (local_got_refcounts[r_symndx] > 0)
1558 local_got_refcounts[r_symndx] -= 1;
1559 }
1560 break;
1561
1562 default:
1563 break;
1564 }
1565 }
1566
1567 return TRUE;
1568 }
1569
1570 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1571 entry but we found we will not create any. Called when we find we will
1572 not have any PLT for this symbol, by for example
1573 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1574 or elf_s390_size_dynamic_sections if no dynamic sections will be
1575 created (we're only linking static objects). */
1576
1577 static void
1578 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1579 {
1580 if (h->elf.root.type == bfd_link_hash_warning)
1581 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1582
1583 if (h->gotplt_refcount <= 0)
1584 return;
1585
1586 /* We simply add the number of gotplt references to the number
1587 * of got references for this symbol. */
1588 h->elf.got.refcount += h->gotplt_refcount;
1589 h->gotplt_refcount = -1;
1590 }
1591
1592 /* Adjust a symbol defined by a dynamic object and referenced by a
1593 regular object. The current definition is in some section of the
1594 dynamic object, but we're not including those sections. We have to
1595 change the definition to something the rest of the link can
1596 understand. */
1597
1598 static bfd_boolean
1599 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1600 struct elf_link_hash_entry *h)
1601 {
1602 struct elf_s390_link_hash_table *htab;
1603 asection *s;
1604
1605 /* STT_GNU_IFUNC symbol must go through PLT. */
1606 if (s390_is_ifunc_symbol_p (h))
1607 {
1608 /* All local STT_GNU_IFUNC references must be treated as local
1609 calls via local PLT. */
1610 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1611 {
1612 bfd_size_type pc_count = 0, count = 0;
1613 struct elf_dyn_relocs **pp;
1614 struct elf_s390_link_hash_entry *eh;
1615 struct elf_dyn_relocs *p;
1616
1617 eh = (struct elf_s390_link_hash_entry *) h;
1618 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1619 {
1620 pc_count += p->pc_count;
1621 p->count -= p->pc_count;
1622 p->pc_count = 0;
1623 count += p->count;
1624 if (p->count == 0)
1625 *pp = p->next;
1626 else
1627 pp = &p->next;
1628 }
1629
1630 if (pc_count || count)
1631 {
1632 h->needs_plt = 1;
1633 h->non_got_ref = 1;
1634 if (h->plt.refcount <= 0)
1635 h->plt.refcount = 1;
1636 else
1637 h->plt.refcount += 1;
1638 }
1639 }
1640
1641 if (h->plt.refcount <= 0)
1642 {
1643 h->plt.offset = (bfd_vma) -1;
1644 h->needs_plt = 0;
1645 }
1646 return TRUE;
1647 }
1648
1649 /* If this is a function, put it in the procedure linkage table. We
1650 will fill in the contents of the procedure linkage table later
1651 (although we could actually do it here). */
1652 if (h->type == STT_FUNC
1653 || h->needs_plt)
1654 {
1655 if (h->plt.refcount <= 0
1656 || SYMBOL_CALLS_LOCAL (info, h)
1657 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1658 && h->root.type == bfd_link_hash_undefweak))
1659 {
1660 /* This case can occur if we saw a PLT32 reloc in an input
1661 file, but the symbol was never referred to by a dynamic
1662 object, or if all references were garbage collected. In
1663 such a case, we don't actually need to build a procedure
1664 linkage table, and we can just do a PC32 reloc instead. */
1665 h->plt.offset = (bfd_vma) -1;
1666 h->needs_plt = 0;
1667 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1668 }
1669
1670 return TRUE;
1671 }
1672 else
1673 /* It's possible that we incorrectly decided a .plt reloc was
1674 needed for an R_390_PC32 reloc to a non-function sym in
1675 check_relocs. We can't decide accurately between function and
1676 non-function syms in check-relocs; Objects loaded later in
1677 the link may change h->type. So fix it now. */
1678 h->plt.offset = (bfd_vma) -1;
1679
1680 /* If this is a weak symbol, and there is a real definition, the
1681 processor independent code will have arranged for us to see the
1682 real definition first, and we can just use the same value. */
1683 if (h->u.weakdef != NULL)
1684 {
1685 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1686 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1687 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1688 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1689 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1690 h->non_got_ref = h->u.weakdef->non_got_ref;
1691 return TRUE;
1692 }
1693
1694 /* This is a reference to a symbol defined by a dynamic object which
1695 is not a function. */
1696
1697 /* If we are creating a shared library, we must presume that the
1698 only references to the symbol are via the global offset table.
1699 For such cases we need not do anything here; the relocations will
1700 be handled correctly by relocate_section. */
1701 if (bfd_link_pic (info))
1702 return TRUE;
1703
1704 /* If there are no references to this symbol that do not use the
1705 GOT, we don't need to generate a copy reloc. */
1706 if (!h->non_got_ref)
1707 return TRUE;
1708
1709 /* If -z nocopyreloc was given, we won't generate them either. */
1710 if (info->nocopyreloc)
1711 {
1712 h->non_got_ref = 0;
1713 return TRUE;
1714 }
1715
1716 if (ELIMINATE_COPY_RELOCS)
1717 {
1718 struct elf_s390_link_hash_entry * eh;
1719 struct elf_dyn_relocs *p;
1720
1721 eh = (struct elf_s390_link_hash_entry *) h;
1722 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1723 {
1724 s = p->sec->output_section;
1725 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1726 break;
1727 }
1728
1729 /* If we didn't find any dynamic relocs in read-only sections, then
1730 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1731 if (p == NULL)
1732 {
1733 h->non_got_ref = 0;
1734 return TRUE;
1735 }
1736 }
1737
1738 /* We must allocate the symbol in our .dynbss section, which will
1739 become part of the .bss section of the executable. There will be
1740 an entry for this symbol in the .dynsym section. The dynamic
1741 object will contain position independent code, so all references
1742 from the dynamic object to this symbol will go through the global
1743 offset table. The dynamic linker will use the .dynsym entry to
1744 determine the address it must put in the global offset table, so
1745 both the dynamic object and the regular object will refer to the
1746 same memory location for the variable. */
1747
1748 htab = elf_s390_hash_table (info);
1749 if (htab == NULL)
1750 return FALSE;
1751
1752 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1753 copy the initial value out of the dynamic object and into the
1754 runtime process image. */
1755 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1756 {
1757 htab->srelbss->size += sizeof (Elf64_External_Rela);
1758 h->needs_copy = 1;
1759 }
1760
1761 s = htab->sdynbss;
1762
1763 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1764 }
1765
1766 /* Allocate space in .plt, .got and associated reloc sections for
1767 dynamic relocs. */
1768
1769 static bfd_boolean
1770 allocate_dynrelocs (struct elf_link_hash_entry *h,
1771 void * inf)
1772 {
1773 struct bfd_link_info *info;
1774 struct elf_s390_link_hash_table *htab;
1775 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1776 struct elf_dyn_relocs *p;
1777
1778 if (h->root.type == bfd_link_hash_indirect)
1779 return TRUE;
1780
1781 info = (struct bfd_link_info *) inf;
1782 htab = elf_s390_hash_table (info);
1783 if (htab == NULL)
1784 return FALSE;
1785
1786 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1787 here if it is defined and referenced in a non-shared object. */
1788 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1789 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1790 else if (htab->elf.dynamic_sections_created
1791 && h->plt.refcount > 0)
1792 {
1793 /* Make sure this symbol is output as a dynamic symbol.
1794 Undefined weak syms won't yet be marked as dynamic. */
1795 if (h->dynindx == -1
1796 && !h->forced_local)
1797 {
1798 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1799 return FALSE;
1800 }
1801
1802 if (bfd_link_pic (info)
1803 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1804 {
1805 asection *s = htab->elf.splt;
1806
1807 /* If this is the first .plt entry, make room for the special
1808 first entry. */
1809 if (s->size == 0)
1810 s->size += PLT_FIRST_ENTRY_SIZE;
1811
1812 h->plt.offset = s->size;
1813
1814 /* If this symbol is not defined in a regular file, and we are
1815 not generating a shared library, then set the symbol to this
1816 location in the .plt. This is required to make function
1817 pointers compare as equal between the normal executable and
1818 the shared library. */
1819 if (! bfd_link_pic (info)
1820 && !h->def_regular)
1821 {
1822 h->root.u.def.section = s;
1823 h->root.u.def.value = h->plt.offset;
1824 }
1825
1826 /* Make room for this entry. */
1827 s->size += PLT_ENTRY_SIZE;
1828
1829 /* We also need to make an entry in the .got.plt section, which
1830 will be placed in the .got section by the linker script. */
1831 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1832
1833 /* We also need to make an entry in the .rela.plt section. */
1834 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1835 }
1836 else
1837 {
1838 h->plt.offset = (bfd_vma) -1;
1839 h->needs_plt = 0;
1840 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1841 }
1842 }
1843 else
1844 {
1845 h->plt.offset = (bfd_vma) -1;
1846 h->needs_plt = 0;
1847 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1848 }
1849
1850 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1851 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1852 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1853 we can save the dynamic TLS relocation. */
1854 if (h->got.refcount > 0
1855 && !bfd_link_pic (info)
1856 && h->dynindx == -1
1857 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1858 {
1859 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1860 /* For the GOTIE access without a literal pool entry the offset has
1861 to be stored somewhere. The immediate value in the instruction
1862 is not bit enough so the value is stored in the got. */
1863 {
1864 h->got.offset = htab->elf.sgot->size;
1865 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1866 }
1867 else
1868 h->got.offset = (bfd_vma) -1;
1869 }
1870 else if (h->got.refcount > 0)
1871 {
1872 asection *s;
1873 bfd_boolean dyn;
1874 int tls_type = elf_s390_hash_entry(h)->tls_type;
1875
1876 /* Make sure this symbol is output as a dynamic symbol.
1877 Undefined weak syms won't yet be marked as dynamic. */
1878 if (h->dynindx == -1
1879 && !h->forced_local)
1880 {
1881 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1882 return FALSE;
1883 }
1884
1885 s = htab->elf.sgot;
1886 h->got.offset = s->size;
1887 s->size += GOT_ENTRY_SIZE;
1888 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1889 if (tls_type == GOT_TLS_GD)
1890 s->size += GOT_ENTRY_SIZE;
1891 dyn = htab->elf.dynamic_sections_created;
1892 /* R_390_TLS_IE64 needs one dynamic relocation,
1893 R_390_TLS_GD64 needs one if local symbol and two if global. */
1894 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1895 || tls_type >= GOT_TLS_IE)
1896 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1897 else if (tls_type == GOT_TLS_GD)
1898 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
1899 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1900 || h->root.type != bfd_link_hash_undefweak)
1901 && (bfd_link_pic (info)
1902 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1903 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
1904 }
1905 else
1906 h->got.offset = (bfd_vma) -1;
1907
1908 if (eh->dyn_relocs == NULL)
1909 return TRUE;
1910
1911 /* In the shared -Bsymbolic case, discard space allocated for
1912 dynamic pc-relative relocs against symbols which turn out to be
1913 defined in regular objects. For the normal shared case, discard
1914 space for pc-relative relocs that have become local due to symbol
1915 visibility changes. */
1916
1917 if (bfd_link_pic (info))
1918 {
1919 if (SYMBOL_CALLS_LOCAL (info, h))
1920 {
1921 struct elf_dyn_relocs **pp;
1922
1923 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1924 {
1925 p->count -= p->pc_count;
1926 p->pc_count = 0;
1927 if (p->count == 0)
1928 *pp = p->next;
1929 else
1930 pp = &p->next;
1931 }
1932 }
1933
1934 /* Also discard relocs on undefined weak syms with non-default
1935 visibility. */
1936 if (eh->dyn_relocs != NULL
1937 && h->root.type == bfd_link_hash_undefweak)
1938 {
1939 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1940 eh->dyn_relocs = NULL;
1941
1942 /* Make sure undefined weak symbols are output as a dynamic
1943 symbol in PIEs. */
1944 else if (h->dynindx == -1
1945 && !h->forced_local)
1946 {
1947 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1948 return FALSE;
1949 }
1950 }
1951 }
1952 else if (ELIMINATE_COPY_RELOCS)
1953 {
1954 /* For the non-shared case, discard space for relocs against
1955 symbols which turn out to need copy relocs or are not
1956 dynamic. */
1957
1958 if (!h->non_got_ref
1959 && ((h->def_dynamic
1960 && !h->def_regular)
1961 || (htab->elf.dynamic_sections_created
1962 && (h->root.type == bfd_link_hash_undefweak
1963 || h->root.type == bfd_link_hash_undefined))))
1964 {
1965 /* Make sure this symbol is output as a dynamic symbol.
1966 Undefined weak syms won't yet be marked as dynamic. */
1967 if (h->dynindx == -1
1968 && !h->forced_local)
1969 {
1970 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1971 return FALSE;
1972 }
1973
1974 /* If that succeeded, we know we'll be keeping all the
1975 relocs. */
1976 if (h->dynindx != -1)
1977 goto keep;
1978 }
1979
1980 eh->dyn_relocs = NULL;
1981
1982 keep: ;
1983 }
1984
1985 /* Finally, allocate space. */
1986 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1987 {
1988 asection *sreloc = elf_section_data (p->sec)->sreloc;
1989 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1990 }
1991
1992 return TRUE;
1993 }
1994
1995 /* Find any dynamic relocs that apply to read-only sections. */
1996
1997 static bfd_boolean
1998 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1999 {
2000 struct elf_s390_link_hash_entry *eh;
2001 struct elf_dyn_relocs *p;
2002
2003 eh = (struct elf_s390_link_hash_entry *) h;
2004 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2005 {
2006 asection *s = p->sec->output_section;
2007
2008 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2009 {
2010 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2011
2012 info->flags |= DF_TEXTREL;
2013
2014 /* Not an error, just cut short the traversal. */
2015 return FALSE;
2016 }
2017 }
2018 return TRUE;
2019 }
2020
2021 /* Set the sizes of the dynamic sections. */
2022
2023 static bfd_boolean
2024 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2025 struct bfd_link_info *info)
2026 {
2027 struct elf_s390_link_hash_table *htab;
2028 bfd *dynobj;
2029 asection *s;
2030 bfd_boolean relocs;
2031 bfd *ibfd;
2032
2033 htab = elf_s390_hash_table (info);
2034 if (htab == NULL)
2035 return FALSE;
2036
2037 dynobj = htab->elf.dynobj;
2038 if (dynobj == NULL)
2039 abort ();
2040
2041 if (htab->elf.dynamic_sections_created)
2042 {
2043 /* Set the contents of the .interp section to the interpreter. */
2044 if (bfd_link_executable (info) && !info->nointerp)
2045 {
2046 s = bfd_get_linker_section (dynobj, ".interp");
2047 if (s == NULL)
2048 abort ();
2049 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2050 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2051 }
2052 }
2053
2054 /* Set up .got offsets for local syms, and space for local dynamic
2055 relocs. */
2056 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2057 {
2058 bfd_signed_vma *local_got;
2059 bfd_signed_vma *end_local_got;
2060 char *local_tls_type;
2061 bfd_size_type locsymcount;
2062 Elf_Internal_Shdr *symtab_hdr;
2063 asection *srela;
2064 struct plt_entry *local_plt;
2065 unsigned int i;
2066
2067 if (! is_s390_elf (ibfd))
2068 continue;
2069
2070 for (s = ibfd->sections; s != NULL; s = s->next)
2071 {
2072 struct elf_dyn_relocs *p;
2073
2074 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2075 {
2076 if (!bfd_is_abs_section (p->sec)
2077 && bfd_is_abs_section (p->sec->output_section))
2078 {
2079 /* Input section has been discarded, either because
2080 it is a copy of a linkonce section or due to
2081 linker script /DISCARD/, so we'll be discarding
2082 the relocs too. */
2083 }
2084 else if (p->count != 0)
2085 {
2086 srela = elf_section_data (p->sec)->sreloc;
2087 srela->size += p->count * sizeof (Elf64_External_Rela);
2088 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2089 info->flags |= DF_TEXTREL;
2090 }
2091 }
2092 }
2093
2094 local_got = elf_local_got_refcounts (ibfd);
2095 if (!local_got)
2096 continue;
2097
2098 symtab_hdr = &elf_symtab_hdr (ibfd);
2099 locsymcount = symtab_hdr->sh_info;
2100 end_local_got = local_got + locsymcount;
2101 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2102 s = htab->elf.sgot;
2103 srela = htab->elf.srelgot;
2104 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2105 {
2106 if (*local_got > 0)
2107 {
2108 *local_got = s->size;
2109 s->size += GOT_ENTRY_SIZE;
2110 if (*local_tls_type == GOT_TLS_GD)
2111 s->size += GOT_ENTRY_SIZE;
2112 if (bfd_link_pic (info))
2113 srela->size += sizeof (Elf64_External_Rela);
2114 }
2115 else
2116 *local_got = (bfd_vma) -1;
2117 }
2118
2119 local_plt = elf_s390_local_plt (ibfd);
2120 for (i = 0; i < symtab_hdr->sh_info; i++)
2121 {
2122 if (local_plt[i].plt.refcount > 0)
2123 {
2124 local_plt[i].plt.offset = htab->elf.iplt->size;
2125 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2126 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2127 htab->elf.irelplt->size += sizeof (Elf64_External_Rela);
2128 }
2129 else
2130 local_plt[i].plt.offset = (bfd_vma) -1;
2131 }
2132 }
2133
2134 if (htab->tls_ldm_got.refcount > 0)
2135 {
2136 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2137 relocs. */
2138 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2139 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2140 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2141 }
2142 else
2143 htab->tls_ldm_got.offset = -1;
2144
2145 /* Allocate global sym .plt and .got entries, and space for global
2146 sym dynamic relocs. */
2147 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2148
2149 /* We now have determined the sizes of the various dynamic sections.
2150 Allocate memory for them. */
2151 relocs = FALSE;
2152 for (s = dynobj->sections; s != NULL; s = s->next)
2153 {
2154 if ((s->flags & SEC_LINKER_CREATED) == 0)
2155 continue;
2156
2157 if (s == htab->elf.splt
2158 || s == htab->elf.sgot
2159 || s == htab->elf.sgotplt
2160 || s == htab->sdynbss
2161 || s == htab->elf.iplt
2162 || s == htab->elf.igotplt
2163 || s == htab->irelifunc)
2164 {
2165 /* Strip this section if we don't need it; see the
2166 comment below. */
2167 }
2168 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2169 {
2170 if (s->size != 0 && s != htab->elf.srelplt)
2171 relocs = TRUE;
2172
2173 /* We use the reloc_count field as a counter if we need
2174 to copy relocs into the output file. */
2175 s->reloc_count = 0;
2176 }
2177 else
2178 {
2179 /* It's not one of our sections, so don't allocate space. */
2180 continue;
2181 }
2182
2183 if (s->size == 0)
2184 {
2185 /* If we don't need this section, strip it from the
2186 output file. This is to handle .rela.bss and
2187 .rela.plt. We must create it in
2188 create_dynamic_sections, because it must be created
2189 before the linker maps input sections to output
2190 sections. The linker does that before
2191 adjust_dynamic_symbol is called, and it is that
2192 function which decides whether anything needs to go
2193 into these sections. */
2194
2195 s->flags |= SEC_EXCLUDE;
2196 continue;
2197 }
2198
2199 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2200 continue;
2201
2202 /* Allocate memory for the section contents. We use bfd_zalloc
2203 here in case unused entries are not reclaimed before the
2204 section's contents are written out. This should not happen,
2205 but this way if it does, we get a R_390_NONE reloc instead
2206 of garbage. */
2207 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2208 if (s->contents == NULL)
2209 return FALSE;
2210 }
2211
2212 if (htab->elf.dynamic_sections_created)
2213 {
2214 /* Add some entries to the .dynamic section. We fill in the
2215 values later, in elf_s390_finish_dynamic_sections, but we
2216 must add the entries now so that we get the correct size for
2217 the .dynamic section. The DT_DEBUG entry is filled in by the
2218 dynamic linker and used by the debugger. */
2219 #define add_dynamic_entry(TAG, VAL) \
2220 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2221
2222 if (bfd_link_executable (info))
2223 {
2224 if (!add_dynamic_entry (DT_DEBUG, 0))
2225 return FALSE;
2226 }
2227
2228 if (htab->elf.splt->size != 0)
2229 {
2230 if (!add_dynamic_entry (DT_PLTGOT, 0)
2231 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2232 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2233 || !add_dynamic_entry (DT_JMPREL, 0))
2234 return FALSE;
2235 }
2236
2237 if (relocs)
2238 {
2239 if (!add_dynamic_entry (DT_RELA, 0)
2240 || !add_dynamic_entry (DT_RELASZ, 0)
2241 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2242 return FALSE;
2243
2244 /* If any dynamic relocs apply to a read-only section,
2245 then we need a DT_TEXTREL entry. */
2246 if ((info->flags & DF_TEXTREL) == 0)
2247 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2248 info);
2249
2250 if ((info->flags & DF_TEXTREL) != 0)
2251 {
2252 if (!add_dynamic_entry (DT_TEXTREL, 0))
2253 return FALSE;
2254 }
2255 }
2256 }
2257 #undef add_dynamic_entry
2258
2259 return TRUE;
2260 }
2261
2262 /* Return the base VMA address which should be subtracted from real addresses
2263 when resolving @dtpoff relocation.
2264 This is PT_TLS segment p_vaddr. */
2265
2266 static bfd_vma
2267 dtpoff_base (struct bfd_link_info *info)
2268 {
2269 /* If tls_sec is NULL, we should have signalled an error already. */
2270 if (elf_hash_table (info)->tls_sec == NULL)
2271 return 0;
2272 return elf_hash_table (info)->tls_sec->vma;
2273 }
2274
2275 /* Return the relocation value for @tpoff relocation
2276 if STT_TLS virtual address is ADDRESS. */
2277
2278 static bfd_vma
2279 tpoff (struct bfd_link_info *info, bfd_vma address)
2280 {
2281 struct elf_link_hash_table *htab = elf_hash_table (info);
2282
2283 /* If tls_sec is NULL, we should have signalled an error already. */
2284 if (htab->tls_sec == NULL)
2285 return 0;
2286 return htab->tls_size + htab->tls_sec->vma - address;
2287 }
2288
2289 /* Complain if TLS instruction relocation is against an invalid
2290 instruction. */
2291
2292 static void
2293 invalid_tls_insn (bfd *input_bfd,
2294 asection *input_section,
2295 Elf_Internal_Rela *rel)
2296 {
2297 reloc_howto_type *howto;
2298
2299 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2300 _bfd_error_handler
2301 /* xgettext:c-format */
2302 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2303 input_bfd,
2304 input_section,
2305 (long) rel->r_offset,
2306 howto->name);
2307 bfd_set_error (bfd_error_bad_value);
2308 }
2309
2310 /* Relocate a 390 ELF section. */
2311
2312 static bfd_boolean
2313 elf_s390_relocate_section (bfd *output_bfd,
2314 struct bfd_link_info *info,
2315 bfd *input_bfd,
2316 asection *input_section,
2317 bfd_byte *contents,
2318 Elf_Internal_Rela *relocs,
2319 Elf_Internal_Sym *local_syms,
2320 asection **local_sections)
2321 {
2322 struct elf_s390_link_hash_table *htab;
2323 Elf_Internal_Shdr *symtab_hdr;
2324 struct elf_link_hash_entry **sym_hashes;
2325 bfd_vma *local_got_offsets;
2326 Elf_Internal_Rela *rel;
2327 Elf_Internal_Rela *relend;
2328
2329 BFD_ASSERT (is_s390_elf (input_bfd));
2330
2331 htab = elf_s390_hash_table (info);
2332 if (htab == NULL)
2333 return FALSE;
2334
2335 symtab_hdr = &elf_symtab_hdr (input_bfd);
2336 sym_hashes = elf_sym_hashes (input_bfd);
2337 local_got_offsets = elf_local_got_offsets (input_bfd);
2338
2339 rel = relocs;
2340 relend = relocs + input_section->reloc_count;
2341 for (; rel < relend; rel++)
2342 {
2343 unsigned int r_type;
2344 reloc_howto_type *howto;
2345 unsigned long r_symndx;
2346 struct elf_link_hash_entry *h;
2347 Elf_Internal_Sym *sym;
2348 asection *sec;
2349 bfd_vma off;
2350 bfd_vma relocation;
2351 bfd_boolean unresolved_reloc;
2352 bfd_reloc_status_type r;
2353 int tls_type;
2354 asection *base_got = htab->elf.sgot;
2355
2356 r_type = ELF64_R_TYPE (rel->r_info);
2357 if (r_type == (int) R_390_GNU_VTINHERIT
2358 || r_type == (int) R_390_GNU_VTENTRY)
2359 continue;
2360 if (r_type >= (int) R_390_max)
2361 {
2362 bfd_set_error (bfd_error_bad_value);
2363 return FALSE;
2364 }
2365
2366 howto = elf_howto_table + r_type;
2367 r_symndx = ELF64_R_SYM (rel->r_info);
2368
2369 h = NULL;
2370 sym = NULL;
2371 sec = NULL;
2372 unresolved_reloc = FALSE;
2373 if (r_symndx < symtab_hdr->sh_info)
2374 {
2375 sym = local_syms + r_symndx;
2376 sec = local_sections[r_symndx];
2377
2378 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2379 {
2380 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2381 if (local_plt == NULL)
2382 return FALSE;
2383
2384 /* Address of the PLT slot. */
2385 relocation = (htab->elf.iplt->output_section->vma
2386 + htab->elf.iplt->output_offset
2387 + local_plt[r_symndx].plt.offset);
2388
2389 switch (r_type)
2390 {
2391 case R_390_PLTOFF16:
2392 case R_390_PLTOFF32:
2393 case R_390_PLTOFF64:
2394 relocation -= htab->elf.sgot->output_section->vma;
2395 break;
2396 case R_390_GOTPLT12:
2397 case R_390_GOTPLT16:
2398 case R_390_GOTPLT20:
2399 case R_390_GOTPLT32:
2400 case R_390_GOTPLT64:
2401 case R_390_GOTPLTENT:
2402 case R_390_GOT12:
2403 case R_390_GOT16:
2404 case R_390_GOT20:
2405 case R_390_GOT32:
2406 case R_390_GOT64:
2407 case R_390_GOTENT:
2408 {
2409 /* Write the PLT slot address into the GOT slot. */
2410 bfd_put_64 (output_bfd, relocation,
2411 htab->elf.sgot->contents +
2412 local_got_offsets[r_symndx]);
2413 relocation = (local_got_offsets[r_symndx] +
2414 htab->elf.sgot->output_offset);
2415
2416 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2417 relocation += htab->elf.sgot->output_section->vma;
2418 break;
2419 }
2420 default:
2421 break;
2422 }
2423 /* The output section is needed later in
2424 finish_dynamic_section when creating the dynamic
2425 relocation. */
2426 local_plt[r_symndx].sec = sec;
2427 goto do_relocation;
2428 }
2429 else
2430 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2431 }
2432 else
2433 {
2434 bfd_boolean warned ATTRIBUTE_UNUSED;
2435 bfd_boolean ignored ATTRIBUTE_UNUSED;
2436
2437 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2438 r_symndx, symtab_hdr, sym_hashes,
2439 h, sec, relocation,
2440 unresolved_reloc, warned, ignored);
2441 }
2442
2443 if (sec != NULL && discarded_section (sec))
2444 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2445 rel, 1, relend, howto, 0, contents);
2446
2447 if (bfd_link_relocatable (info))
2448 continue;
2449
2450 switch (r_type)
2451 {
2452 case R_390_GOTPLT12:
2453 case R_390_GOTPLT16:
2454 case R_390_GOTPLT20:
2455 case R_390_GOTPLT32:
2456 case R_390_GOTPLT64:
2457 case R_390_GOTPLTENT:
2458 /* There are three cases for a GOTPLT relocation. 1) The
2459 relocation is against the jump slot entry of a plt that
2460 will get emitted to the output file. 2) The relocation
2461 is against the jump slot of a plt entry that has been
2462 removed. elf_s390_adjust_gotplt has created a GOT entry
2463 as replacement. 3) The relocation is against a local symbol.
2464 Cases 2) and 3) are the same as the GOT relocation code
2465 so we just have to test for case 1 and fall through for
2466 the other two. */
2467 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2468 {
2469 bfd_vma plt_index;
2470
2471 if (s390_is_ifunc_symbol_p (h))
2472 {
2473 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2474 relocation = (plt_index * GOT_ENTRY_SIZE +
2475 htab->elf.igotplt->output_offset);
2476 if (r_type == R_390_GOTPLTENT)
2477 relocation += htab->elf.igotplt->output_section->vma;
2478 }
2479 else
2480 {
2481 /* Calc. index no.
2482 Current offset - size first entry / entry size. */
2483 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2484 PLT_ENTRY_SIZE;
2485
2486 /* Offset in GOT is PLT index plus GOT headers(3)
2487 times 8, addr & GOT addr. */
2488 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2489 if (r_type == R_390_GOTPLTENT)
2490 relocation += htab->elf.sgot->output_section->vma;
2491 }
2492 unresolved_reloc = FALSE;
2493 break;
2494 }
2495 /* Fall through. */
2496
2497 case R_390_GOT12:
2498 case R_390_GOT16:
2499 case R_390_GOT20:
2500 case R_390_GOT32:
2501 case R_390_GOT64:
2502 case R_390_GOTENT:
2503 /* Relocation is to the entry for this symbol in the global
2504 offset table. */
2505 if (base_got == NULL)
2506 abort ();
2507
2508 if (h != NULL)
2509 {
2510 bfd_boolean dyn;
2511
2512 off = h->got.offset;
2513 dyn = htab->elf.dynamic_sections_created;
2514
2515 if (s390_is_ifunc_symbol_p (h))
2516 {
2517 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2518 if (off == (bfd_vma)-1)
2519 {
2520 /* No explicit GOT usage so redirect to the
2521 got.iplt slot. */
2522 base_got = htab->elf.igotplt;
2523 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2524 }
2525 else
2526 {
2527 /* Explicit GOT slots must contain the address
2528 of the PLT slot. This will be handled in
2529 finish_dynamic_symbol. */
2530 }
2531 }
2532 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2533 bfd_link_pic (info),
2534 h)
2535 || (bfd_link_pic (info)
2536 && SYMBOL_REFERENCES_LOCAL (info, h))
2537 || (ELF_ST_VISIBILITY (h->other)
2538 && h->root.type == bfd_link_hash_undefweak))
2539 {
2540 /* This is actually a static link, or it is a
2541 -Bsymbolic link and the symbol is defined
2542 locally, or the symbol was forced to be local
2543 because of a version file. We must initialize
2544 this entry in the global offset table. Since the
2545 offset must always be a multiple of 2, we use the
2546 least significant bit to record whether we have
2547 initialized it already.
2548
2549 When doing a dynamic link, we create a .rel.got
2550 relocation entry to initialize the value. This
2551 is done in the finish_dynamic_symbol routine. */
2552 if ((off & 1) != 0)
2553 off &= ~1;
2554 else
2555 {
2556 bfd_put_64 (output_bfd, relocation,
2557 base_got->contents + off);
2558 h->got.offset |= 1;
2559 }
2560
2561 if ((h->def_regular
2562 && bfd_link_pic (info)
2563 && SYMBOL_REFERENCES_LOCAL (info, h))
2564 /* lgrl rx,sym@GOTENT -> larl rx, sym */
2565 && ((r_type == R_390_GOTENT
2566 && (bfd_get_16 (input_bfd,
2567 contents + rel->r_offset - 2)
2568 & 0xff0f) == 0xc408)
2569 /* lg rx, sym@GOT(r12) -> larl rx, sym */
2570 || (r_type == R_390_GOT20
2571 && (bfd_get_32 (input_bfd,
2572 contents + rel->r_offset - 2)
2573 & 0xff00f000) == 0xe300c000
2574 && bfd_get_8 (input_bfd,
2575 contents + rel->r_offset + 3) == 0x04)))
2576
2577 {
2578 unsigned short new_insn =
2579 (0xc000 | (bfd_get_8 (input_bfd,
2580 contents + rel->r_offset - 1) & 0xf0));
2581 bfd_put_16 (output_bfd, new_insn,
2582 contents + rel->r_offset - 2);
2583 r_type = R_390_PC32DBL;
2584 rel->r_addend = 2;
2585 howto = elf_howto_table + r_type;
2586 relocation = h->root.u.def.value
2587 + h->root.u.def.section->output_section->vma
2588 + h->root.u.def.section->output_offset;
2589 goto do_relocation;
2590 }
2591 }
2592 else
2593 unresolved_reloc = FALSE;
2594 }
2595 else
2596 {
2597 if (local_got_offsets == NULL)
2598 abort ();
2599
2600 off = local_got_offsets[r_symndx];
2601
2602 /* The offset must always be a multiple of 8. We use
2603 the least significant bit to record whether we have
2604 already generated the necessary reloc. */
2605 if ((off & 1) != 0)
2606 off &= ~1;
2607 else
2608 {
2609 bfd_put_64 (output_bfd, relocation,
2610 htab->elf.sgot->contents + off);
2611
2612 if (bfd_link_pic (info))
2613 {
2614 asection *s;
2615 Elf_Internal_Rela outrel;
2616 bfd_byte *loc;
2617
2618 s = htab->elf.srelgot;
2619 if (s == NULL)
2620 abort ();
2621
2622 outrel.r_offset = (htab->elf.sgot->output_section->vma
2623 + htab->elf.sgot->output_offset
2624 + off);
2625 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2626 outrel.r_addend = relocation;
2627 loc = s->contents;
2628 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2629 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2630 }
2631
2632 local_got_offsets[r_symndx] |= 1;
2633 }
2634 }
2635
2636 if (off >= (bfd_vma) -2)
2637 abort ();
2638
2639 relocation = base_got->output_offset + off;
2640
2641 /* For @GOTENT the relocation is against the offset between
2642 the instruction and the symbols entry in the GOT and not
2643 between the start of the GOT and the symbols entry. We
2644 add the vma of the GOT to get the correct value. */
2645 if ( r_type == R_390_GOTENT
2646 || r_type == R_390_GOTPLTENT)
2647 relocation += base_got->output_section->vma;
2648
2649 break;
2650
2651 case R_390_GOTOFF16:
2652 case R_390_GOTOFF32:
2653 case R_390_GOTOFF64:
2654 /* Relocation is relative to the start of the global offset
2655 table. */
2656
2657 if (h != NULL
2658 && s390_is_ifunc_symbol_p (h)
2659 && h->def_regular
2660 && !bfd_link_executable (info))
2661 {
2662 relocation = (htab->elf.iplt->output_section->vma
2663 + htab->elf.iplt->output_offset
2664 + h->plt.offset
2665 - htab->elf.sgot->output_section->vma);
2666 goto do_relocation;
2667 }
2668
2669 /* Note that sgot->output_offset is not involved in this
2670 calculation. We always want the start of .got. If we
2671 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2672 permitted by the ABI, we might have to change this
2673 calculation. */
2674 relocation -= htab->elf.sgot->output_section->vma;
2675 break;
2676
2677 case R_390_GOTPC:
2678 case R_390_GOTPCDBL:
2679 /* Use global offset table as symbol value. */
2680 relocation = htab->elf.sgot->output_section->vma;
2681 unresolved_reloc = FALSE;
2682 break;
2683
2684 case R_390_PLT12DBL:
2685 case R_390_PLT16DBL:
2686 case R_390_PLT24DBL:
2687 case R_390_PLT32:
2688 case R_390_PLT32DBL:
2689 case R_390_PLT64:
2690 /* Relocation is to the entry for this symbol in the
2691 procedure linkage table. */
2692
2693 /* Resolve a PLT32 reloc against a local symbol directly,
2694 without using the procedure linkage table. */
2695 if (h == NULL)
2696 break;
2697
2698 if (h->plt.offset == (bfd_vma) -1
2699 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2700 {
2701 /* We didn't make a PLT entry for this symbol. This
2702 happens when statically linking PIC code, or when
2703 using -Bsymbolic. */
2704 break;
2705 }
2706 if (s390_is_ifunc_symbol_p (h))
2707 relocation = (htab->elf.iplt->output_section->vma
2708 + htab->elf.iplt->output_offset
2709 + h->plt.offset);
2710 else
2711 relocation = (htab->elf.splt->output_section->vma
2712 + htab->elf.splt->output_offset
2713 + h->plt.offset);
2714 unresolved_reloc = FALSE;
2715 break;
2716
2717 case R_390_PLTOFF16:
2718 case R_390_PLTOFF32:
2719 case R_390_PLTOFF64:
2720 /* Relocation is to the entry for this symbol in the
2721 procedure linkage table relative to the start of the GOT. */
2722
2723 /* For local symbols or if we didn't make a PLT entry for
2724 this symbol resolve the symbol directly. */
2725 if (h == NULL
2726 || h->plt.offset == (bfd_vma) -1
2727 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2728 {
2729 relocation -= htab->elf.sgot->output_section->vma;
2730 break;
2731 }
2732
2733 if (s390_is_ifunc_symbol_p (h))
2734 relocation = (htab->elf.iplt->output_section->vma
2735 + htab->elf.iplt->output_offset
2736 + h->plt.offset
2737 - htab->elf.sgot->output_section->vma);
2738 else
2739 relocation = (htab->elf.splt->output_section->vma
2740 + htab->elf.splt->output_offset
2741 + h->plt.offset
2742 - htab->elf.sgot->output_section->vma);
2743 unresolved_reloc = FALSE;
2744 break;
2745
2746 case R_390_PC16:
2747 case R_390_PC12DBL:
2748 case R_390_PC16DBL:
2749 case R_390_PC24DBL:
2750 case R_390_PC32:
2751 case R_390_PC32DBL:
2752 case R_390_PC64:
2753 /* The target of these relocs are instruction operands
2754 residing in read-only sections. We cannot emit a runtime
2755 reloc for it. */
2756 if (h != NULL
2757 && s390_is_ifunc_symbol_p (h)
2758 && h->def_regular
2759 && bfd_link_pic (info))
2760 {
2761 relocation = (htab->elf.iplt->output_section->vma
2762 + htab->elf.iplt->output_offset
2763 + h->plt.offset);
2764 goto do_relocation;
2765 }
2766 /* Fall through. */
2767
2768 case R_390_8:
2769 case R_390_16:
2770 case R_390_32:
2771 case R_390_64:
2772
2773 if (h != NULL
2774 && s390_is_ifunc_symbol_p (h)
2775 && h->def_regular)
2776 {
2777 if (!bfd_link_pic (info) || !h->non_got_ref)
2778 {
2779 /* For a non-shared object STT_GNU_IFUNC symbol must
2780 go through PLT. */
2781 relocation = (htab->elf.iplt->output_section->vma
2782 + htab->elf.iplt->output_offset
2783 + h ->plt.offset);
2784 goto do_relocation;
2785 }
2786 else
2787 {
2788 /* For shared objects a runtime relocation is needed. */
2789
2790 Elf_Internal_Rela outrel;
2791 asection *sreloc;
2792
2793 /* Need a dynamic relocation to get the real function
2794 address. */
2795 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2796 info,
2797 input_section,
2798 rel->r_offset);
2799 if (outrel.r_offset == (bfd_vma) -1
2800 || outrel.r_offset == (bfd_vma) -2)
2801 abort ();
2802
2803 outrel.r_offset += (input_section->output_section->vma
2804 + input_section->output_offset);
2805
2806 if (h->dynindx == -1
2807 || h->forced_local
2808 || bfd_link_executable (info))
2809 {
2810 /* This symbol is resolved locally. */
2811 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
2812 outrel.r_addend = (h->root.u.def.value
2813 + h->root.u.def.section->output_section->vma
2814 + h->root.u.def.section->output_offset);
2815 }
2816 else
2817 {
2818 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2819 outrel.r_addend = 0;
2820 }
2821
2822 sreloc = htab->elf.irelifunc;
2823 elf_append_rela (output_bfd, sreloc, &outrel);
2824
2825 /* If this reloc is against an external symbol, we
2826 do not want to fiddle with the addend. Otherwise,
2827 we need to include the symbol value so that it
2828 becomes an addend for the dynamic reloc. For an
2829 internal symbol, we have updated addend. */
2830 continue;
2831 }
2832 }
2833
2834 if ((input_section->flags & SEC_ALLOC) == 0)
2835 break;
2836
2837 if ((bfd_link_pic (info)
2838 && (h == NULL
2839 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2840 || h->root.type != bfd_link_hash_undefweak)
2841 && ((r_type != R_390_PC16
2842 && r_type != R_390_PC12DBL
2843 && r_type != R_390_PC16DBL
2844 && r_type != R_390_PC24DBL
2845 && r_type != R_390_PC32
2846 && r_type != R_390_PC32DBL
2847 && r_type != R_390_PC64)
2848 || !SYMBOL_CALLS_LOCAL (info, h)))
2849 || (ELIMINATE_COPY_RELOCS
2850 && !bfd_link_pic (info)
2851 && h != NULL
2852 && h->dynindx != -1
2853 && !h->non_got_ref
2854 && ((h->def_dynamic
2855 && !h->def_regular)
2856 || h->root.type == bfd_link_hash_undefweak
2857 || h->root.type == bfd_link_hash_undefined)))
2858 {
2859 Elf_Internal_Rela outrel;
2860 bfd_boolean skip, relocate;
2861 asection *sreloc;
2862 bfd_byte *loc;
2863
2864 /* When generating a shared object, these relocations
2865 are copied into the output file to be resolved at run
2866 time. */
2867 skip = FALSE;
2868 relocate = FALSE;
2869
2870 outrel.r_offset =
2871 _bfd_elf_section_offset (output_bfd, info, input_section,
2872 rel->r_offset);
2873 if (outrel.r_offset == (bfd_vma) -1)
2874 skip = TRUE;
2875 else if (outrel.r_offset == (bfd_vma) -2)
2876 skip = TRUE, relocate = TRUE;
2877
2878 outrel.r_offset += (input_section->output_section->vma
2879 + input_section->output_offset);
2880
2881 if (skip)
2882 memset (&outrel, 0, sizeof outrel);
2883 else if (h != NULL
2884 && h->dynindx != -1
2885 && (r_type == R_390_PC16
2886 || r_type == R_390_PC12DBL
2887 || r_type == R_390_PC16DBL
2888 || r_type == R_390_PC24DBL
2889 || r_type == R_390_PC32
2890 || r_type == R_390_PC32DBL
2891 || r_type == R_390_PC64
2892 || !bfd_link_pic (info)
2893 || !SYMBOLIC_BIND (info, h)
2894 || !h->def_regular))
2895 {
2896 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2897 outrel.r_addend = rel->r_addend;
2898 }
2899 else
2900 {
2901 /* This symbol is local, or marked to become local. */
2902 outrel.r_addend = relocation + rel->r_addend;
2903 if (r_type == R_390_64)
2904 {
2905 relocate = TRUE;
2906 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2907 }
2908 else
2909 {
2910 long sindx;
2911
2912 if (bfd_is_abs_section (sec))
2913 sindx = 0;
2914 else if (sec == NULL || sec->owner == NULL)
2915 {
2916 bfd_set_error(bfd_error_bad_value);
2917 return FALSE;
2918 }
2919 else
2920 {
2921 asection *osec;
2922
2923 osec = sec->output_section;
2924 sindx = elf_section_data (osec)->dynindx;
2925
2926 if (sindx == 0)
2927 {
2928 osec = htab->elf.text_index_section;
2929 sindx = elf_section_data (osec)->dynindx;
2930 }
2931 BFD_ASSERT (sindx != 0);
2932
2933 /* We are turning this relocation into one
2934 against a section symbol, so subtract out
2935 the output section's address but not the
2936 offset of the input section in the output
2937 section. */
2938 outrel.r_addend -= osec->vma;
2939 }
2940 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2941 }
2942 }
2943
2944 sreloc = elf_section_data (input_section)->sreloc;
2945 if (sreloc == NULL)
2946 abort ();
2947
2948 loc = sreloc->contents;
2949 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2950 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2951
2952 /* If this reloc is against an external symbol, we do
2953 not want to fiddle with the addend. Otherwise, we
2954 need to include the symbol value so that it becomes
2955 an addend for the dynamic reloc. */
2956 if (! relocate)
2957 continue;
2958 }
2959
2960 break;
2961
2962 /* Relocations for tls literal pool entries. */
2963 case R_390_TLS_IE64:
2964 if (bfd_link_pic (info))
2965 {
2966 Elf_Internal_Rela outrel;
2967 asection *sreloc;
2968 bfd_byte *loc;
2969
2970 outrel.r_offset = rel->r_offset
2971 + input_section->output_section->vma
2972 + input_section->output_offset;
2973 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2974 sreloc = elf_section_data (input_section)->sreloc;
2975 if (sreloc == NULL)
2976 abort ();
2977 loc = sreloc->contents;
2978 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2979 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2980 }
2981 /* Fall through. */
2982
2983 case R_390_TLS_GD64:
2984 case R_390_TLS_GOTIE64:
2985 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2986 tls_type = GOT_UNKNOWN;
2987 if (h == NULL && local_got_offsets)
2988 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2989 else if (h != NULL)
2990 {
2991 tls_type = elf_s390_hash_entry(h)->tls_type;
2992 if (!bfd_link_pic (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2993 r_type = R_390_TLS_LE64;
2994 }
2995 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2996 r_type = R_390_TLS_IE64;
2997
2998 if (r_type == R_390_TLS_LE64)
2999 {
3000 /* This relocation gets optimized away by the local exec
3001 access optimization. */
3002 BFD_ASSERT (! unresolved_reloc);
3003 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3004 contents + rel->r_offset);
3005 continue;
3006 }
3007
3008 if (htab->elf.sgot == NULL)
3009 abort ();
3010
3011 if (h != NULL)
3012 off = h->got.offset;
3013 else
3014 {
3015 if (local_got_offsets == NULL)
3016 abort ();
3017
3018 off = local_got_offsets[r_symndx];
3019 }
3020
3021 emit_tls_relocs:
3022
3023 if ((off & 1) != 0)
3024 off &= ~1;
3025 else
3026 {
3027 Elf_Internal_Rela outrel;
3028 bfd_byte *loc;
3029 int dr_type, indx;
3030
3031 if (htab->elf.srelgot == NULL)
3032 abort ();
3033
3034 outrel.r_offset = (htab->elf.sgot->output_section->vma
3035 + htab->elf.sgot->output_offset + off);
3036
3037 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3038 if (r_type == R_390_TLS_GD64)
3039 dr_type = R_390_TLS_DTPMOD;
3040 else
3041 dr_type = R_390_TLS_TPOFF;
3042 if (dr_type == R_390_TLS_TPOFF && indx == 0)
3043 outrel.r_addend = relocation - dtpoff_base (info);
3044 else
3045 outrel.r_addend = 0;
3046 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3047 loc = htab->elf.srelgot->contents;
3048 loc += htab->elf.srelgot->reloc_count++
3049 * sizeof (Elf64_External_Rela);
3050 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3051
3052 if (r_type == R_390_TLS_GD64)
3053 {
3054 if (indx == 0)
3055 {
3056 BFD_ASSERT (! unresolved_reloc);
3057 bfd_put_64 (output_bfd,
3058 relocation - dtpoff_base (info),
3059 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3060 }
3061 else
3062 {
3063 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
3064 outrel.r_offset += GOT_ENTRY_SIZE;
3065 outrel.r_addend = 0;
3066 htab->elf.srelgot->reloc_count++;
3067 loc += sizeof (Elf64_External_Rela);
3068 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3069 }
3070 }
3071
3072 if (h != NULL)
3073 h->got.offset |= 1;
3074 else
3075 local_got_offsets[r_symndx] |= 1;
3076 }
3077
3078 if (off >= (bfd_vma) -2)
3079 abort ();
3080 if (r_type == ELF64_R_TYPE (rel->r_info))
3081 {
3082 relocation = htab->elf.sgot->output_offset + off;
3083 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
3084 relocation += htab->elf.sgot->output_section->vma;
3085 unresolved_reloc = FALSE;
3086 }
3087 else
3088 {
3089 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
3090 contents + rel->r_offset);
3091 continue;
3092 }
3093 break;
3094
3095 case R_390_TLS_GOTIE12:
3096 case R_390_TLS_GOTIE20:
3097 case R_390_TLS_IEENT:
3098 if (h == NULL)
3099 {
3100 if (local_got_offsets == NULL)
3101 abort();
3102 off = local_got_offsets[r_symndx];
3103 if (bfd_link_pic (info))
3104 goto emit_tls_relocs;
3105 }
3106 else
3107 {
3108 off = h->got.offset;
3109 tls_type = elf_s390_hash_entry(h)->tls_type;
3110 if (bfd_link_pic (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE)
3111 goto emit_tls_relocs;
3112 }
3113
3114 if (htab->elf.sgot == NULL)
3115 abort ();
3116
3117 BFD_ASSERT (! unresolved_reloc);
3118 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3119 htab->elf.sgot->contents + off);
3120 relocation = htab->elf.sgot->output_offset + off;
3121 if (r_type == R_390_TLS_IEENT)
3122 relocation += htab->elf.sgot->output_section->vma;
3123 unresolved_reloc = FALSE;
3124 break;
3125
3126 case R_390_TLS_LDM64:
3127 if (! bfd_link_pic (info))
3128 /* The literal pool entry this relocation refers to gets ignored
3129 by the optimized code of the local exec model. Do nothing
3130 and the value will turn out zero. */
3131 continue;
3132
3133 if (htab->elf.sgot == NULL)
3134 abort ();
3135
3136 off = htab->tls_ldm_got.offset;
3137 if (off & 1)
3138 off &= ~1;
3139 else
3140 {
3141 Elf_Internal_Rela outrel;
3142 bfd_byte *loc;
3143
3144 if (htab->elf.srelgot == NULL)
3145 abort ();
3146
3147 outrel.r_offset = (htab->elf.sgot->output_section->vma
3148 + htab->elf.sgot->output_offset + off);
3149
3150 bfd_put_64 (output_bfd, 0,
3151 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3152 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
3153 outrel.r_addend = 0;
3154 loc = htab->elf.srelgot->contents;
3155 loc += htab->elf.srelgot->reloc_count++
3156 * sizeof (Elf64_External_Rela);
3157 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3158 htab->tls_ldm_got.offset |= 1;
3159 }
3160 relocation = htab->elf.sgot->output_offset + off;
3161 unresolved_reloc = FALSE;
3162 break;
3163
3164 case R_390_TLS_LE64:
3165 if (bfd_link_dll (info))
3166 {
3167 /* Linking a shared library with non-fpic code requires
3168 a R_390_TLS_TPOFF relocation. */
3169 Elf_Internal_Rela outrel;
3170 asection *sreloc;
3171 bfd_byte *loc;
3172 int indx;
3173
3174 outrel.r_offset = rel->r_offset
3175 + input_section->output_section->vma
3176 + input_section->output_offset;
3177 if (h != NULL && h->dynindx != -1)
3178 indx = h->dynindx;
3179 else
3180 indx = 0;
3181 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
3182 if (indx == 0)
3183 outrel.r_addend = relocation - dtpoff_base (info);
3184 else
3185 outrel.r_addend = 0;
3186 sreloc = elf_section_data (input_section)->sreloc;
3187 if (sreloc == NULL)
3188 abort ();
3189 loc = sreloc->contents;
3190 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3191 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3192 }
3193 else
3194 {
3195 BFD_ASSERT (! unresolved_reloc);
3196 bfd_put_64 (output_bfd, -tpoff (info, relocation),
3197 contents + rel->r_offset);
3198 }
3199 continue;
3200
3201 case R_390_TLS_LDO64:
3202 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
3203 relocation -= dtpoff_base (info);
3204 else
3205 /* When converting LDO to LE, we must negate. */
3206 relocation = -tpoff (info, relocation);
3207 break;
3208
3209 /* Relocations for tls instructions. */
3210 case R_390_TLS_LOAD:
3211 case R_390_TLS_GDCALL:
3212 case R_390_TLS_LDCALL:
3213 tls_type = GOT_UNKNOWN;
3214 if (h == NULL && local_got_offsets)
3215 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3216 else if (h != NULL)
3217 tls_type = elf_s390_hash_entry(h)->tls_type;
3218
3219 if (tls_type == GOT_TLS_GD)
3220 continue;
3221
3222 if (r_type == R_390_TLS_LOAD)
3223 {
3224 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3225 {
3226 /* IE->LE transition. Four valid cases:
3227 lg %rx,(0,%ry) -> sllg %rx,%ry,0
3228 lg %rx,(%ry,0) -> sllg %rx,%ry,0
3229 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
3230 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
3231 unsigned int insn0, insn1, ry;
3232
3233 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3234 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3235 if (insn1 != 0x0004)
3236 invalid_tls_insn (input_bfd, input_section, rel);
3237 ry = 0;
3238 if ((insn0 & 0xff00f000) == 0xe3000000)
3239 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
3240 ry = (insn0 & 0x000f0000);
3241 else if ((insn0 & 0xff0f0000) == 0xe3000000)
3242 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
3243 ry = (insn0 & 0x0000f000) << 4;
3244 else if ((insn0 & 0xff00f000) == 0xe300c000)
3245 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
3246 ry = (insn0 & 0x000f0000);
3247 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
3248 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
3249 ry = (insn0 & 0x0000f000) << 4;
3250 else
3251 invalid_tls_insn (input_bfd, input_section, rel);
3252 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
3253 insn1 = 0x000d;
3254 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3255 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3256 }
3257 }
3258 else if (r_type == R_390_TLS_GDCALL)
3259 {
3260 unsigned int insn0, insn1;
3261
3262 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3263 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3264 if ((insn0 & 0xffff0000) != 0xc0e50000)
3265 invalid_tls_insn (input_bfd, input_section, rel);
3266 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3267 {
3268 /* GD->LE transition.
3269 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3270 insn0 = 0xc0040000;
3271 insn1 = 0x0000;
3272 }
3273 else
3274 {
3275 /* GD->IE transition.
3276 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
3277 insn0 = 0xe322c000;
3278 insn1 = 0x0004;
3279 }
3280 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3281 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3282 }
3283 else if (r_type == R_390_TLS_LDCALL)
3284 {
3285 if (!bfd_link_pic (info))
3286 {
3287 unsigned int insn0, insn1;
3288
3289 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
3290 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
3291 if ((insn0 & 0xffff0000) != 0xc0e50000)
3292 invalid_tls_insn (input_bfd, input_section, rel);
3293 /* LD->LE transition.
3294 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3295 insn0 = 0xc0040000;
3296 insn1 = 0x0000;
3297 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3298 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3299 }
3300 }
3301 continue;
3302
3303 default:
3304 break;
3305 }
3306
3307 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3308 because such sections are not SEC_ALLOC and thus ld.so will
3309 not process them. */
3310 if (unresolved_reloc
3311 && !((input_section->flags & SEC_DEBUGGING) != 0
3312 && h->def_dynamic)
3313 && _bfd_elf_section_offset (output_bfd, info, input_section,
3314 rel->r_offset) != (bfd_vma) -1)
3315 _bfd_error_handler
3316 /* xgettext:c-format */
3317 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3318 input_bfd,
3319 input_section,
3320 (long) rel->r_offset,
3321 howto->name,
3322 h->root.root.string);
3323
3324 do_relocation:
3325
3326 /* When applying a 24 bit reloc we need to start one byte
3327 earlier. Otherwise the 32 bit get/put bfd operations might
3328 access a byte after the actual section. */
3329 if (r_type == R_390_PC24DBL
3330 || r_type == R_390_PLT24DBL)
3331 rel->r_offset--;
3332
3333 if (r_type == R_390_20
3334 || r_type == R_390_GOT20
3335 || r_type == R_390_GOTPLT20
3336 || r_type == R_390_TLS_GOTIE20)
3337 {
3338 relocation += rel->r_addend;
3339 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3340 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3341 contents, rel->r_offset,
3342 relocation, 0);
3343 }
3344 else
3345 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3346 contents, rel->r_offset,
3347 relocation, rel->r_addend);
3348
3349 if (r != bfd_reloc_ok)
3350 {
3351 const char *name;
3352
3353 if (h != NULL)
3354 name = h->root.root.string;
3355 else
3356 {
3357 name = bfd_elf_string_from_elf_section (input_bfd,
3358 symtab_hdr->sh_link,
3359 sym->st_name);
3360 if (name == NULL)
3361 return FALSE;
3362 if (*name == '\0')
3363 name = bfd_section_name (input_bfd, sec);
3364 }
3365
3366 if (r == bfd_reloc_overflow)
3367 (*info->callbacks->reloc_overflow)
3368 (info, (h ? &h->root : NULL), name, howto->name,
3369 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3370 else
3371 {
3372 _bfd_error_handler
3373 /* xgettext:c-format */
3374 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3375 input_bfd, input_section,
3376 (long) rel->r_offset, name, (int) r);
3377 return FALSE;
3378 }
3379 }
3380 }
3381
3382 return TRUE;
3383 }
3384
3385 /* Generate the PLT slots together with the dynamic relocations needed
3386 for IFUNC symbols. */
3387
3388 static void
3389 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3390 struct bfd_link_info *info,
3391 struct elf_link_hash_entry *h,
3392 struct elf_s390_link_hash_table *htab,
3393 bfd_vma plt_offset,
3394 bfd_vma resolver_address)
3395 {
3396 bfd_vma plt_index;
3397 bfd_vma got_offset;
3398 Elf_Internal_Rela rela;
3399 bfd_byte *loc;
3400 asection *plt, *gotplt, *relplt;
3401
3402 if (htab->elf.iplt == NULL
3403 || htab->elf.igotplt == NULL
3404 || htab->elf.irelplt == NULL)
3405 abort ();
3406
3407 /* Index of the PLT slot within iplt section. */
3408 plt_index = plt_offset / PLT_ENTRY_SIZE;
3409 plt = htab->elf.iplt;
3410 /* Offset into the igot.plt section. */
3411 got_offset = plt_index * GOT_ENTRY_SIZE;
3412 gotplt = htab->elf.igotplt;
3413 relplt = htab->elf.irelplt;
3414
3415 /* Fill in the blueprint of a PLT. */
3416 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
3417 PLT_ENTRY_SIZE);
3418
3419 /* Fixup the relative address to the GOT entry */
3420 bfd_put_32 (output_bfd,
3421 (gotplt->output_section->vma +
3422 gotplt->output_offset + got_offset
3423 - (plt->output_section->vma +
3424 plt->output_offset +
3425 plt_offset))/2,
3426 plt->contents + plt_offset + 2);
3427 /* Fixup the relative branch to PLT 0 */
3428 bfd_put_32 (output_bfd, - (plt->output_offset +
3429 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3430 plt->contents + plt_offset + 24);
3431 /* Fixup offset into .rela.plt section. */
3432 bfd_put_32 (output_bfd, relplt->output_offset +
3433 plt_index * sizeof (Elf64_External_Rela),
3434 plt->contents + plt_offset + 28);
3435
3436 /* Fill in the entry in the global offset table.
3437 Points to instruction after GOT offset. */
3438 bfd_put_64 (output_bfd,
3439 (plt->output_section->vma
3440 + plt->output_offset
3441 + plt_offset
3442 + 14),
3443 gotplt->contents + got_offset);
3444
3445 /* Fill in the entry in the .rela.plt section. */
3446 rela.r_offset = (gotplt->output_section->vma
3447 + gotplt->output_offset
3448 + got_offset);
3449
3450 if (!h
3451 || h->dynindx == -1
3452 || ((bfd_link_executable (info)
3453 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3454 && h->def_regular))
3455 {
3456 /* The symbol can be locally resolved. */
3457 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
3458 rela.r_addend = resolver_address;
3459 }
3460 else
3461 {
3462 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3463 rela.r_addend = 0;
3464 }
3465
3466 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3467 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3468 }
3469
3470
3471 /* Finish up dynamic symbol handling. We set the contents of various
3472 dynamic sections here. */
3473
3474 static bfd_boolean
3475 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3476 struct bfd_link_info *info,
3477 struct elf_link_hash_entry *h,
3478 Elf_Internal_Sym *sym)
3479 {
3480 struct elf_s390_link_hash_table *htab;
3481 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3482
3483 htab = elf_s390_hash_table (info);
3484 if (htab == NULL)
3485 return FALSE;
3486
3487 if (h->plt.offset != (bfd_vma) -1)
3488 {
3489 bfd_vma plt_index;
3490 bfd_vma got_offset;
3491 Elf_Internal_Rela rela;
3492 bfd_byte *loc;
3493
3494 /* This symbol has an entry in the procedure linkage table. Set
3495 it up. */
3496 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3497 {
3498 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3499 htab, h->plt.offset,
3500 eh->ifunc_resolver_address +
3501 eh->ifunc_resolver_section->output_offset +
3502 eh->ifunc_resolver_section->output_section->vma);
3503
3504 /* Do not return yet. Handling of explicit GOT slots of
3505 IFUNC symbols is below. */
3506 }
3507 else
3508 {
3509 if (h->dynindx == -1
3510 || htab->elf.splt == NULL
3511 || htab->elf.sgotplt == NULL
3512 || htab->elf.srelplt == NULL)
3513 abort ();
3514
3515 /* Calc. index no.
3516 Current offset - size first entry / entry size. */
3517 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3518
3519 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3520 addr & GOT addr. */
3521 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3522
3523 /* Fill in the blueprint of a PLT. */
3524 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
3525 PLT_ENTRY_SIZE);
3526
3527 /* Fixup the relative address to the GOT entry */
3528 bfd_put_32 (output_bfd,
3529 (htab->elf.sgotplt->output_section->vma +
3530 htab->elf.sgotplt->output_offset + got_offset
3531 - (htab->elf.splt->output_section->vma +
3532 htab->elf.splt->output_offset +
3533 h->plt.offset))/2,
3534 htab->elf.splt->contents + h->plt.offset + 2);
3535 /* Fixup the relative branch to PLT 0 */
3536 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3537 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3538 htab->elf.splt->contents + h->plt.offset + 24);
3539 /* Fixup offset into .rela.plt section. */
3540 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3541 htab->elf.splt->contents + h->plt.offset + 28);
3542
3543 /* Fill in the entry in the global offset table.
3544 Points to instruction after GOT offset. */
3545 bfd_put_64 (output_bfd,
3546 (htab->elf.splt->output_section->vma
3547 + htab->elf.splt->output_offset
3548 + h->plt.offset
3549 + 14),
3550 htab->elf.sgotplt->contents + got_offset);
3551
3552 /* Fill in the entry in the .rela.plt section. */
3553 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3554 + htab->elf.sgotplt->output_offset
3555 + got_offset);
3556 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3557 rela.r_addend = 0;
3558 loc = htab->elf.srelplt->contents + plt_index *
3559 sizeof (Elf64_External_Rela);
3560 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3561
3562 if (!h->def_regular)
3563 {
3564 /* Mark the symbol as undefined, rather than as defined in
3565 the .plt section. Leave the value alone. This is a clue
3566 for the dynamic linker, to make function pointer
3567 comparisons work between an application and shared
3568 library. */
3569 sym->st_shndx = SHN_UNDEF;
3570 }
3571 }
3572 }
3573
3574 if (h->got.offset != (bfd_vma) -1
3575 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3576 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3577 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3578 {
3579 Elf_Internal_Rela rela;
3580 bfd_byte *loc;
3581
3582 /* This symbol has an entry in the global offset table. Set it
3583 up. */
3584 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3585 abort ();
3586
3587 rela.r_offset = (htab->elf.sgot->output_section->vma
3588 + htab->elf.sgot->output_offset
3589 + (h->got.offset &~ (bfd_vma) 1));
3590
3591 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3592 {
3593 if (bfd_link_pic (info))
3594 {
3595 /* An explicit GOT slot usage needs GLOB_DAT. If the
3596 symbol references local the implicit got.iplt slot
3597 will be used and the IRELATIVE reloc has been created
3598 above. */
3599 goto do_glob_dat;
3600 }
3601 else
3602 {
3603 /* For non-shared objects explicit GOT slots must be
3604 filled with the PLT slot address for pointer
3605 equality reasons. */
3606 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
3607 + htab->elf.iplt->output_offset
3608 + h->plt.offset),
3609 htab->elf.sgot->contents + h->got.offset);
3610 return TRUE;
3611 }
3612 }
3613 else if (bfd_link_pic (info)
3614 && SYMBOL_REFERENCES_LOCAL (info, h))
3615 {
3616 /* If this is a static link, or it is a -Bsymbolic link and
3617 the symbol is defined locally or was forced to be local
3618 because of a version file, we just want to emit a
3619 RELATIVE reloc. The entry in the global offset table
3620 will already have been initialized in the
3621 relocate_section function. */
3622 if (!h->def_regular)
3623 return FALSE;
3624 BFD_ASSERT((h->got.offset & 1) != 0);
3625 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3626 rela.r_addend = (h->root.u.def.value
3627 + h->root.u.def.section->output_section->vma
3628 + h->root.u.def.section->output_offset);
3629 }
3630 else
3631 {
3632 BFD_ASSERT((h->got.offset & 1) == 0);
3633 do_glob_dat:
3634 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3635 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3636 rela.r_addend = 0;
3637 }
3638
3639 loc = htab->elf.srelgot->contents;
3640 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3641 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3642 }
3643
3644 if (h->needs_copy)
3645 {
3646 Elf_Internal_Rela rela;
3647 bfd_byte *loc;
3648
3649 /* This symbols needs a copy reloc. Set it up. */
3650
3651 if (h->dynindx == -1
3652 || (h->root.type != bfd_link_hash_defined
3653 && h->root.type != bfd_link_hash_defweak)
3654 || htab->srelbss == NULL)
3655 abort ();
3656
3657 rela.r_offset = (h->root.u.def.value
3658 + h->root.u.def.section->output_section->vma
3659 + h->root.u.def.section->output_offset);
3660 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3661 rela.r_addend = 0;
3662 loc = htab->srelbss->contents;
3663 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3664 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3665 }
3666
3667 /* Mark some specially defined symbols as absolute. */
3668 if (h == htab->elf.hdynamic
3669 || h == htab->elf.hgot
3670 || h == htab->elf.hplt)
3671 sym->st_shndx = SHN_ABS;
3672
3673 return TRUE;
3674 }
3675
3676 /* Used to decide how to sort relocs in an optimal manner for the
3677 dynamic linker, before writing them out. */
3678
3679 static enum elf_reloc_type_class
3680 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3681 const asection *rel_sec ATTRIBUTE_UNUSED,
3682 const Elf_Internal_Rela *rela)
3683 {
3684 bfd *abfd = info->output_bfd;
3685 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3686 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3687 unsigned long r_symndx = ELF64_R_SYM (rela->r_info);
3688 Elf_Internal_Sym sym;
3689
3690 if (htab->elf.dynsym == NULL
3691 || !bed->s->swap_symbol_in (abfd,
3692 (htab->elf.dynsym->contents
3693 + r_symndx * bed->s->sizeof_sym),
3694 0, &sym))
3695 abort ();
3696
3697 /* Check relocation against STT_GNU_IFUNC symbol. */
3698 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3699 return reloc_class_ifunc;
3700
3701 switch ((int) ELF64_R_TYPE (rela->r_info))
3702 {
3703 case R_390_RELATIVE:
3704 return reloc_class_relative;
3705 case R_390_JMP_SLOT:
3706 return reloc_class_plt;
3707 case R_390_COPY:
3708 return reloc_class_copy;
3709 default:
3710 return reloc_class_normal;
3711 }
3712 }
3713
3714 /* Finish up the dynamic sections. */
3715
3716 static bfd_boolean
3717 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3718 struct bfd_link_info *info)
3719 {
3720 struct elf_s390_link_hash_table *htab;
3721 bfd *dynobj;
3722 asection *sdyn;
3723 bfd *ibfd;
3724 unsigned int i;
3725
3726 htab = elf_s390_hash_table (info);
3727 if (htab == NULL)
3728 return FALSE;
3729
3730 dynobj = htab->elf.dynobj;
3731 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3732
3733 if (htab->elf.dynamic_sections_created)
3734 {
3735 Elf64_External_Dyn *dyncon, *dynconend;
3736
3737 if (sdyn == NULL || htab->elf.sgot == NULL)
3738 abort ();
3739
3740 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3741 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3742 for (; dyncon < dynconend; dyncon++)
3743 {
3744 Elf_Internal_Dyn dyn;
3745 asection *s;
3746
3747 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3748
3749 switch (dyn.d_tag)
3750 {
3751 default:
3752 continue;
3753
3754 case DT_PLTGOT:
3755 s = htab->elf.sgotplt;
3756 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3757 break;
3758
3759 case DT_JMPREL:
3760 s = htab->elf.srelplt;
3761 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3762 break;
3763
3764 case DT_PLTRELSZ:
3765 dyn.d_un.d_val = htab->elf.srelplt->size + htab->elf.irelplt->size;
3766 break;
3767
3768 case DT_RELASZ:
3769 /* The procedure linkage table relocs (DT_JMPREL) should
3770 not be included in the overall relocs (DT_RELA).
3771 Therefore, we override the DT_RELASZ entry here to
3772 make it not include the JMPREL relocs. Since the
3773 linker script arranges for .rela.plt to follow all
3774 other relocation sections, we don't have to worry
3775 about changing the DT_RELA entry. */
3776 dyn.d_un.d_val -= htab->elf.srelplt->size + htab->elf.irelplt->size;
3777 break;
3778 }
3779
3780 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3781 }
3782
3783 /* Fill in the special first entry in the procedure linkage table. */
3784 if (htab->elf.splt && htab->elf.splt->size > 0)
3785 {
3786 /* fill in blueprint for plt 0 entry */
3787 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
3788 PLT_FIRST_ENTRY_SIZE);
3789 /* Fixup relative address to start of GOT */
3790 bfd_put_32 (output_bfd,
3791 (htab->elf.sgotplt->output_section->vma
3792 + htab->elf.sgotplt->output_offset
3793 - htab->elf.splt->output_section->vma
3794 - htab->elf.splt->output_offset - 6)/2,
3795 htab->elf.splt->contents + 8);
3796 }
3797 if (elf_section_data (htab->elf.splt->output_section) != NULL)
3798 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
3799 = PLT_ENTRY_SIZE;
3800 }
3801
3802 if (htab->elf.sgotplt)
3803 {
3804 /* Fill in the first three entries in the global offset table. */
3805 if (htab->elf.sgotplt->size > 0)
3806 {
3807 bfd_put_64 (output_bfd,
3808 (sdyn == NULL ? (bfd_vma) 0
3809 : sdyn->output_section->vma + sdyn->output_offset),
3810 htab->elf.sgotplt->contents);
3811 /* One entry for shared object struct ptr. */
3812 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3813 /* One entry for _dl_runtime_resolve. */
3814 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 16);
3815 }
3816
3817 elf_section_data (htab->elf.sgot->output_section)
3818 ->this_hdr.sh_entsize = 8;
3819 }
3820
3821 /* Finish dynamic symbol for local IFUNC symbols. */
3822 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3823 {
3824 struct plt_entry *local_plt;
3825 Elf_Internal_Sym *isym;
3826 Elf_Internal_Shdr *symtab_hdr;
3827
3828 symtab_hdr = &elf_symtab_hdr (ibfd);
3829
3830 local_plt = elf_s390_local_plt (ibfd);
3831 if (local_plt != NULL)
3832 for (i = 0; i < symtab_hdr->sh_info; i++)
3833 {
3834 if (local_plt[i].plt.offset != (bfd_vma) -1)
3835 {
3836 asection *sec = local_plt[i].sec;
3837 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3838 if (isym == NULL)
3839 return FALSE;
3840
3841 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3842 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3843 local_plt[i].plt.offset,
3844 isym->st_value
3845 + sec->output_section->vma
3846 + sec->output_offset);
3847
3848 }
3849 }
3850 }
3851
3852 return TRUE;
3853 }
3854 \f
3855 /* Support for core dump NOTE sections. */
3856
3857 static bfd_boolean
3858 elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3859 {
3860 int offset;
3861 size_t size;
3862
3863 switch (note->descsz)
3864 {
3865 default:
3866 return FALSE;
3867
3868 case 336: /* sizeof(struct elf_prstatus) on s390x */
3869 /* pr_cursig */
3870 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3871
3872 /* pr_pid */
3873 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);
3874
3875 /* pr_reg */
3876 offset = 112;
3877 size = 216;
3878 break;
3879 }
3880
3881 /* Make a ".reg/999" section. */
3882 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3883 size, note->descpos + offset);
3884 }
3885
3886 static bfd_boolean
3887 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3888 {
3889 switch (note->descsz)
3890 {
3891 default:
3892 return FALSE;
3893
3894 case 136: /* sizeof(struct elf_prpsinfo) on s390x */
3895 elf_tdata (abfd)->core->pid
3896 = bfd_get_32 (abfd, note->descdata + 24);
3897 elf_tdata (abfd)->core->program
3898 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
3899 elf_tdata (abfd)->core->command
3900 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
3901 }
3902
3903 /* Note that for some reason, a spurious space is tacked
3904 onto the end of the args in some (at least one anyway)
3905 implementations, so strip it off if it exists. */
3906
3907 {
3908 char *command = elf_tdata (abfd)->core->command;
3909 int n = strlen (command);
3910
3911 if (0 < n && command[n - 1] == ' ')
3912 command[n - 1] = '\0';
3913 }
3914
3915 return TRUE;
3916 }
3917
3918 static char *
3919 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3920 int note_type, ...)
3921 {
3922 va_list ap;
3923
3924 switch (note_type)
3925 {
3926 default:
3927 return NULL;
3928
3929 case NT_PRPSINFO:
3930 {
3931 char data[136] = { 0 };
3932 const char *fname, *psargs;
3933
3934 va_start (ap, note_type);
3935 fname = va_arg (ap, const char *);
3936 psargs = va_arg (ap, const char *);
3937 va_end (ap);
3938
3939 strncpy (data + 40, fname, 16);
3940 strncpy (data + 56, psargs, 80);
3941 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3942 &data, sizeof (data));
3943 }
3944
3945 case NT_PRSTATUS:
3946 {
3947 char data[336] = { 0 };
3948 long pid;
3949 int cursig;
3950 const void *gregs;
3951
3952 va_start (ap, note_type);
3953 pid = va_arg (ap, long);
3954 cursig = va_arg (ap, int);
3955 gregs = va_arg (ap, const void *);
3956 va_end (ap);
3957
3958 bfd_put_16 (abfd, cursig, data + 12);
3959 bfd_put_32 (abfd, pid, data + 32);
3960 memcpy (data + 112, gregs, 216);
3961 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3962 &data, sizeof (data));
3963 }
3964 }
3965 /* NOTREACHED */
3966 }
3967 \f
3968 /* Return address for Ith PLT stub in section PLT, for relocation REL
3969 or (bfd_vma) -1 if it should not be included. */
3970
3971 static bfd_vma
3972 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3973 const arelent *rel ATTRIBUTE_UNUSED)
3974 {
3975 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3976 }
3977
3978 /* Merge backend specific data from an object file to the output
3979 object file when linking. */
3980
3981 static bfd_boolean
3982 elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3983 {
3984 if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd))
3985 return TRUE;
3986
3987 return elf_s390_merge_obj_attributes (ibfd, info);
3988 }
3989
3990 /* Why was the hash table entry size definition changed from
3991 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3992 this is the only reason for the s390_elf64_size_info structure. */
3993
3994 const struct elf_size_info s390_elf64_size_info =
3995 {
3996 sizeof (Elf64_External_Ehdr),
3997 sizeof (Elf64_External_Phdr),
3998 sizeof (Elf64_External_Shdr),
3999 sizeof (Elf64_External_Rel),
4000 sizeof (Elf64_External_Rela),
4001 sizeof (Elf64_External_Sym),
4002 sizeof (Elf64_External_Dyn),
4003 sizeof (Elf_External_Note),
4004 8, /* hash-table entry size. */
4005 1, /* internal relocations per external relocations. */
4006 64, /* arch_size. */
4007 3, /* log_file_align. */
4008 ELFCLASS64, EV_CURRENT,
4009 bfd_elf64_write_out_phdrs,
4010 bfd_elf64_write_shdrs_and_ehdr,
4011 bfd_elf64_checksum_contents,
4012 bfd_elf64_write_relocs,
4013 bfd_elf64_swap_symbol_in,
4014 bfd_elf64_swap_symbol_out,
4015 bfd_elf64_slurp_reloc_table,
4016 bfd_elf64_slurp_symbol_table,
4017 bfd_elf64_swap_dyn_in,
4018 bfd_elf64_swap_dyn_out,
4019 bfd_elf64_swap_reloc_in,
4020 bfd_elf64_swap_reloc_out,
4021 bfd_elf64_swap_reloca_in,
4022 bfd_elf64_swap_reloca_out
4023 };
4024
4025 #define TARGET_BIG_SYM s390_elf64_vec
4026 #define TARGET_BIG_NAME "elf64-s390"
4027 #define ELF_ARCH bfd_arch_s390
4028 #define ELF_TARGET_ID S390_ELF_DATA
4029 #define ELF_MACHINE_CODE EM_S390
4030 #define ELF_MACHINE_ALT1 EM_S390_OLD
4031 #define ELF_MAXPAGESIZE 0x1000
4032
4033 #define elf_backend_size_info s390_elf64_size_info
4034
4035 #define elf_backend_can_gc_sections 1
4036 #define elf_backend_can_refcount 1
4037 #define elf_backend_want_got_plt 1
4038 #define elf_backend_plt_readonly 1
4039 #define elf_backend_want_plt_sym 0
4040 #define elf_backend_got_header_size 24
4041 #define elf_backend_rela_normal 1
4042
4043 #define elf_info_to_howto elf_s390_info_to_howto
4044
4045 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
4046 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
4047 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
4048 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
4049 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data
4050
4051 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
4052 #define elf_backend_check_relocs elf_s390_check_relocs
4053 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
4054 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
4055 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
4056 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
4057 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
4058 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
4059 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
4060 #define elf_backend_relocate_section elf_s390_relocate_section
4061 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
4062 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4063 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
4064 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
4065 #define elf_backend_write_core_note elf_s390_write_core_note
4066 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
4067 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
4068 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
4069
4070 #define bfd_elf64_mkobject elf_s390_mkobject
4071 #define elf_backend_object_p elf_s390_object_p
4072
4073 #include "elf64-target.h"
GDB Binutils - Deliverables
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