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merge from gcc
[gdb/gnu.git] / bfd / elf32-s390.c
blob6467b03264149266ed2a138f278a89bad7dfc880
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2011, 2012 Free Software Foundation, Inc.
4 Contributed by Carl B. Pedersen and Martin Schwidefsky.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf/s390.h"
29
30 static bfd_reloc_status_type
31 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
32 asection *, bfd *, char **);
33 static bfd_reloc_status_type
34 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
35 asection *, bfd *, char **);
36
37 /* The relocation "howto" table. */
38
39 static reloc_howto_type elf_howto_table[] =
40 {
41 HOWTO (R_390_NONE, /* type */
42 0, /* rightshift */
43 0, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
44 0, /* bitsize */
45 FALSE, /* pc_relative */
46 0, /* bitpos */
47 complain_overflow_dont, /* complain_on_overflow */
48 bfd_elf_generic_reloc, /* special_function */
49 "R_390_NONE", /* name */
50 FALSE, /* partial_inplace */
51 0, /* src_mask */
52 0, /* dst_mask */
53 FALSE), /* pcrel_offset */
54
55 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
57 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
59 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
61 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
63 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
65 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
67 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
69 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
71 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
73 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
75 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
77 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
79 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
81 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
83 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
85 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
87 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
89 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
91 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
93 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
95 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
97 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
98 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
99 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
100 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
101 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
103 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
105 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
106 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
107 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
108 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
110 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
112 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
113 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
115 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
117 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
119 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
120 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
121 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
122 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
123 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
124 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
125 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
126 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
128 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
129 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
130 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
131 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
133 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
134 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
136 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
137 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
139 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
140 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
142 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
144 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
145 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
147 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
148 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
150 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
152 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
154 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
155 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
156 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
157 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
158 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
159 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
160 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
161 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
162 HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE),
164 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE),
166 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE),
168 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE),
170 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE),
172 };
173
174 /* GNU extension to record C++ vtable hierarchy. */
175 static reloc_howto_type elf32_s390_vtinherit_howto =
176 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
177 static reloc_howto_type elf32_s390_vtentry_howto =
178 HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
179
180 static reloc_howto_type *
181 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
182 bfd_reloc_code_real_type code)
183 {
184 switch (code)
185 {
186 case BFD_RELOC_NONE:
187 return &elf_howto_table[(int) R_390_NONE];
188 case BFD_RELOC_8:
189 return &elf_howto_table[(int) R_390_8];
190 case BFD_RELOC_390_12:
191 return &elf_howto_table[(int) R_390_12];
192 case BFD_RELOC_16:
193 return &elf_howto_table[(int) R_390_16];
194 case BFD_RELOC_32:
195 return &elf_howto_table[(int) R_390_32];
196 case BFD_RELOC_CTOR:
197 return &elf_howto_table[(int) R_390_32];
198 case BFD_RELOC_32_PCREL:
199 return &elf_howto_table[(int) R_390_PC32];
200 case BFD_RELOC_390_GOT12:
201 return &elf_howto_table[(int) R_390_GOT12];
202 case BFD_RELOC_32_GOT_PCREL:
203 return &elf_howto_table[(int) R_390_GOT32];
204 case BFD_RELOC_390_PLT32:
205 return &elf_howto_table[(int) R_390_PLT32];
206 case BFD_RELOC_390_COPY:
207 return &elf_howto_table[(int) R_390_COPY];
208 case BFD_RELOC_390_GLOB_DAT:
209 return &elf_howto_table[(int) R_390_GLOB_DAT];
210 case BFD_RELOC_390_JMP_SLOT:
211 return &elf_howto_table[(int) R_390_JMP_SLOT];
212 case BFD_RELOC_390_RELATIVE:
213 return &elf_howto_table[(int) R_390_RELATIVE];
214 case BFD_RELOC_32_GOTOFF:
215 return &elf_howto_table[(int) R_390_GOTOFF32];
216 case BFD_RELOC_390_GOTPC:
217 return &elf_howto_table[(int) R_390_GOTPC];
218 case BFD_RELOC_390_GOT16:
219 return &elf_howto_table[(int) R_390_GOT16];
220 case BFD_RELOC_16_PCREL:
221 return &elf_howto_table[(int) R_390_PC16];
222 case BFD_RELOC_390_PC12DBL:
223 return &elf_howto_table[(int) R_390_PC12DBL];
224 case BFD_RELOC_390_PLT12DBL:
225 return &elf_howto_table[(int) R_390_PLT12DBL];
226 case BFD_RELOC_390_PC16DBL:
227 return &elf_howto_table[(int) R_390_PC16DBL];
228 case BFD_RELOC_390_PLT16DBL:
229 return &elf_howto_table[(int) R_390_PLT16DBL];
230 case BFD_RELOC_390_PC24DBL:
231 return &elf_howto_table[(int) R_390_PC24DBL];
232 case BFD_RELOC_390_PLT24DBL:
233 return &elf_howto_table[(int) R_390_PLT24DBL];
234 case BFD_RELOC_390_PC32DBL:
235 return &elf_howto_table[(int) R_390_PC32DBL];
236 case BFD_RELOC_390_PLT32DBL:
237 return &elf_howto_table[(int) R_390_PLT32DBL];
238 case BFD_RELOC_390_GOTPCDBL:
239 return &elf_howto_table[(int) R_390_GOTPCDBL];
240 case BFD_RELOC_390_GOTENT:
241 return &elf_howto_table[(int) R_390_GOTENT];
242 case BFD_RELOC_16_GOTOFF:
243 return &elf_howto_table[(int) R_390_GOTOFF16];
244 case BFD_RELOC_390_GOTPLT12:
245 return &elf_howto_table[(int) R_390_GOTPLT12];
246 case BFD_RELOC_390_GOTPLT16:
247 return &elf_howto_table[(int) R_390_GOTPLT16];
248 case BFD_RELOC_390_GOTPLT32:
249 return &elf_howto_table[(int) R_390_GOTPLT32];
250 case BFD_RELOC_390_GOTPLTENT:
251 return &elf_howto_table[(int) R_390_GOTPLTENT];
252 case BFD_RELOC_390_PLTOFF16:
253 return &elf_howto_table[(int) R_390_PLTOFF16];
254 case BFD_RELOC_390_PLTOFF32:
255 return &elf_howto_table[(int) R_390_PLTOFF32];
256 case BFD_RELOC_390_TLS_LOAD:
257 return &elf_howto_table[(int) R_390_TLS_LOAD];
258 case BFD_RELOC_390_TLS_GDCALL:
259 return &elf_howto_table[(int) R_390_TLS_GDCALL];
260 case BFD_RELOC_390_TLS_LDCALL:
261 return &elf_howto_table[(int) R_390_TLS_LDCALL];
262 case BFD_RELOC_390_TLS_GD32:
263 return &elf_howto_table[(int) R_390_TLS_GD32];
264 case BFD_RELOC_390_TLS_GOTIE12:
265 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
266 case BFD_RELOC_390_TLS_GOTIE32:
267 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
268 case BFD_RELOC_390_TLS_LDM32:
269 return &elf_howto_table[(int) R_390_TLS_LDM32];
270 case BFD_RELOC_390_TLS_IE32:
271 return &elf_howto_table[(int) R_390_TLS_IE32];
272 case BFD_RELOC_390_TLS_IEENT:
273 return &elf_howto_table[(int) R_390_TLS_IEENT];
274 case BFD_RELOC_390_TLS_LE32:
275 return &elf_howto_table[(int) R_390_TLS_LE32];
276 case BFD_RELOC_390_TLS_LDO32:
277 return &elf_howto_table[(int) R_390_TLS_LDO32];
278 case BFD_RELOC_390_TLS_DTPMOD:
279 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
280 case BFD_RELOC_390_TLS_DTPOFF:
281 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
282 case BFD_RELOC_390_TLS_TPOFF:
283 return &elf_howto_table[(int) R_390_TLS_TPOFF];
284 case BFD_RELOC_390_20:
285 return &elf_howto_table[(int) R_390_20];
286 case BFD_RELOC_390_GOT20:
287 return &elf_howto_table[(int) R_390_GOT20];
288 case BFD_RELOC_390_GOTPLT20:
289 return &elf_howto_table[(int) R_390_GOTPLT20];
290 case BFD_RELOC_390_TLS_GOTIE20:
291 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
292 case BFD_RELOC_390_IRELATIVE:
293 return &elf_howto_table[(int) R_390_IRELATIVE];
294 case BFD_RELOC_VTABLE_INHERIT:
295 return &elf32_s390_vtinherit_howto;
296 case BFD_RELOC_VTABLE_ENTRY:
297 return &elf32_s390_vtentry_howto;
298 default:
299 break;
300 }
301 return 0;
302 }
303
304 static reloc_howto_type *
305 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
306 const char *r_name)
307 {
308 unsigned int i;
309
310 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
311 if (elf_howto_table[i].name != NULL
312 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
313 return &elf_howto_table[i];
314
315 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
316 return &elf32_s390_vtinherit_howto;
317 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
318 return &elf32_s390_vtentry_howto;
319
320 return NULL;
321 }
322
323 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
324 and elf32-s390.c has its own copy. */
325
326 static void
327 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
328 arelent *cache_ptr,
329 Elf_Internal_Rela *dst)
330 {
331 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
332 switch (r_type)
333 {
334 case R_390_GNU_VTINHERIT:
335 cache_ptr->howto = &elf32_s390_vtinherit_howto;
336 break;
337
338 case R_390_GNU_VTENTRY:
339 cache_ptr->howto = &elf32_s390_vtentry_howto;
340 break;
341
342 default:
343 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
344 {
345 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
346 abfd, (int) r_type);
347 r_type = R_390_NONE;
348 }
349 cache_ptr->howto = &elf_howto_table[r_type];
350 }
351 }
352
353 /* A relocation function which doesn't do anything. */
354 static bfd_reloc_status_type
355 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
356 arelent *reloc_entry,
357 asymbol *symbol ATTRIBUTE_UNUSED,
358 void * data ATTRIBUTE_UNUSED,
359 asection *input_section,
360 bfd *output_bfd,
361 char **error_message ATTRIBUTE_UNUSED)
362 {
363 if (output_bfd)
364 reloc_entry->address += input_section->output_offset;
365 return bfd_reloc_ok;
366 }
367
368 /* Handle the large displacement relocs. */
369 static bfd_reloc_status_type
370 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED,
371 arelent *reloc_entry,
372 asymbol *symbol,
373 void * data ATTRIBUTE_UNUSED,
374 asection *input_section,
375 bfd *output_bfd,
376 char **error_message ATTRIBUTE_UNUSED)
377 {
378 reloc_howto_type *howto = reloc_entry->howto;
379 bfd_vma relocation;
380 bfd_vma insn;
381
382 if (output_bfd != (bfd *) NULL
383 && (symbol->flags & BSF_SECTION_SYM) == 0
384 && (! howto->partial_inplace
385 || reloc_entry->addend == 0))
386 {
387 reloc_entry->address += input_section->output_offset;
388 return bfd_reloc_ok;
389 }
390
391 if (output_bfd != NULL)
392 return bfd_reloc_continue;
393
394 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
395 return bfd_reloc_outofrange;
396
397 relocation = (symbol->value
398 + symbol->section->output_section->vma
399 + symbol->section->output_offset);
400 relocation += reloc_entry->addend;
401 if (howto->pc_relative)
402 {
403 relocation -= (input_section->output_section->vma
404 + input_section->output_offset);
405 relocation -= reloc_entry->address;
406 }
407
408 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
409 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
410 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
411
412 if ((bfd_signed_vma) relocation < - 0x80000
413 || (bfd_signed_vma) relocation > 0x7ffff)
414 return bfd_reloc_overflow;
415 else
416 return bfd_reloc_ok;
417 }
418
419 static bfd_boolean
420 elf_s390_is_local_label_name (bfd *abfd, const char *name)
421 {
422 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
423 return TRUE;
424
425 return _bfd_elf_is_local_label_name (abfd, name);
426 }
427
428 /* Functions for the 390 ELF linker. */
429
430 /* The name of the dynamic interpreter. This is put in the .interp
431 section. */
432
433 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
434
435 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
436 copying dynamic variables from a shared lib into an app's dynbss
437 section, and instead use a dynamic relocation to point into the
438 shared lib. */
439 #define ELIMINATE_COPY_RELOCS 1
440
441 /* The size in bytes of the first entry in the procedure linkage table. */
442 #define PLT_FIRST_ENTRY_SIZE 32
443 /* The size in bytes of an entry in the procedure linkage table. */
444 #define PLT_ENTRY_SIZE 32
445
446 #define GOT_ENTRY_SIZE 4
447
448 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela)
449
450 /* The first three entries in a procedure linkage table are reserved,
451 and the initial contents are unimportant (we zero them out).
452 Subsequent entries look like this. See the SVR4 ABI 386
453 supplement to see how this works. */
454
455 /* For the s390, simple addr offset can only be 0 - 4096.
456 To use the full 2 GB address space, several instructions
457 are needed to load an address in a register and execute
458 a branch( or just saving the address)
459
460 Furthermore, only r 0 and 1 are free to use!!! */
461
462 /* The first 3 words in the GOT are then reserved.
463 Word 0 is the address of the dynamic table.
464 Word 1 is a pointer to a structure describing the object
465 Word 2 is used to point to the loader entry address.
466
467 The code for position independent PLT entries looks like this:
468
469 r12 holds addr of the current GOT at entry to the PLT
470
471 The GOT holds the address in the PLT to be executed.
472 The loader then gets:
473 24(15) = Pointer to the structure describing the object.
474 28(15) = Offset into rela.plt
475
476 The loader must then find the module where the function is
477 and insert the address in the GOT.
478
479 Note: 390 can only address +- 64 K relative.
480 We check if offset > 65536, then make a relative branch -64xxx
481 back to a previous defined branch
482
483 PLT1: BASR 1,0 # 2 bytes
484 L 1,22(1) # 4 bytes Load offset in GOT in r 1
485 L 1,(1,12) # 4 bytes Load address from GOT in r1
486 BCR 15,1 # 2 bytes Jump to address
487 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
488 L 1,14(1) # 4 bytes Load offset in symol table in r1
489 BRC 15,-x # 4 bytes Jump to start of PLT
490 .word 0 # 2 bytes filler
491 .long ? # 4 bytes offset in GOT
492 .long ? # 4 bytes offset into rela.plt
493
494 This was the general case. There are two additional, optimizes PLT
495 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
496 First the one for GOT offsets < 4096:
497
498 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
499 BCR 15,1 # 2 bytes Jump to address
500 .word 0,0,0 # 6 bytes filler
501 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
502 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
503 BRC 15,-x # 4 bytes Jump to start of PLT
504 .word 0,0,0 # 6 bytes filler
505 .long ? # 4 bytes offset into rela.plt
506
507 Second the one for GOT offsets < 32768:
508
509 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
510 L 1,(1,12) # 4 bytes Load address from GOT to r1
511 BCR 15,1 # 2 bytes Jump to address
512 .word 0 # 2 bytes filler
513 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
514 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
515 BRC 15,-x # 4 bytes Jump to start of PLT
516 .word 0,0,0 # 6 bytes filler
517 .long ? # 4 bytes offset into rela.plt
518
519 Total = 32 bytes per PLT entry
520
521 The code for static build PLT entries looks like this:
522
523 PLT1: BASR 1,0 # 2 bytes
524 L 1,22(1) # 4 bytes Load address of GOT entry
525 L 1,0(0,1) # 4 bytes Load address from GOT in r1
526 BCR 15,1 # 2 bytes Jump to address
527 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
528 L 1,14(1) # 4 bytes Load offset in symbol table in r1
529 BRC 15,-x # 4 bytes Jump to start of PLT
530 .word 0 # 2 bytes filler
531 .long ? # 4 bytes address of GOT entry
532 .long ? # 4 bytes offset into rela.plt */
533
534 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] =
535 {
536 0x0d, 0x10, /* basr %r1,%r0 */
537 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
538 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */
539 0x07, 0xf1, /* br %r1 */
540 0x0d, 0x10, /* basr %r1,%r0 */
541 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
542 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
543 0x00, 0x00, /* padding */
544 0x00, 0x00, 0x00, 0x00, /* GOT offset */
545 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
546 };
547
548 /* Generic PLT pic entry. */
549 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] =
550 {
551 0x0d, 0x10, /* basr %r1,%r0 */
552 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
553 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
554 0x07, 0xf1, /* br %r1 */
555 0x0d, 0x10, /* basr %r1,%r0 */
556 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
557 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
558 0x00, 0x00, /* padding */
559 0x00, 0x00, 0x00, 0x00, /* GOT offset */
560 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
561 };
562
563 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced
564 when generating the PLT slot with the GOT offset. */
565 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] =
566 {
567 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */
568 0x07, 0xf1, /* br %r1 */
569 0x00, 0x00, 0x00, 0x00, /* padding */
570 0x00, 0x00,
571 0x0d, 0x10, /* basr %r1,%r0 */
572 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
573 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
574 0x00, 0x00, 0x00, 0x00,
575 0x00, 0x00, 0x00, 0x00
576 };
577
578 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced
579 when generating the PLT slot with the GOT offset. */
580 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] =
581 {
582 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */
583 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
584 0x07, 0xf1, /* br %r1 */
585 0x00, 0x00,
586 0x0d, 0x10, /* basr %r1,%r0 */
587 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
588 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
589 0x00, 0x00, 0x00, 0x00,
590 0x00, 0x00, 0x00, 0x00,
591 0x00, 0x00
592 };
593
594 /* The first PLT entry pushes the offset into the rela.plt
595 from R1 onto the stack at 8(15) and the loader object info
596 at 12(15), loads the loader address in R1 and jumps to it. */
597
598 /* The first entry in the PLT for PIC code:
599
600 PLT0:
601 ST 1,28(15) # R1 has offset into rela.plt
602 L 1,4(12) # Get loader ino(object struct address)
603 ST 1,24(15) # Store address
604 L 1,8(12) # Entry address of loader in R1
605 BR 1 # Jump to loader
606
607 The first entry in the PLT for static code:
608
609 PLT0:
610 ST 1,28(15) # R1 has offset into rela.plt
611 BASR 1,0
612 L 1,18(0,1) # Get address of GOT
613 MVC 24(4,15),4(1) # Move loader ino to stack
614 L 1,8(1) # Get address of loader
615 BR 1 # Jump to loader
616 .word 0 # filler
617 .long got # address of GOT */
618
619 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] =
620 {
621 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
622 0x0d, 0x10, /* basr %r1,%r0 */
623 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */
624 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */
625 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */
626 0x07, 0xf1, /* br %r1 */
627 0x00, 0x00, 0x00, 0x00,
628 0x00, 0x00, 0x00, 0x00,
629 0x00, 0x00
630 };
631
632 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] =
633 {
634 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
635 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */
636 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */
637 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */
638 0x07, 0xf1, /* br %r1 */
639 0x00, 0x00, 0x00, 0x00,
640 0x00, 0x00, 0x00, 0x00,
641 0x00, 0x00, 0x00, 0x00,
642 0x00, 0x00
643 };
644
645
646 /* s390 ELF linker hash entry. */
647
648 struct elf_s390_link_hash_entry
649 {
650 struct elf_link_hash_entry elf;
651
652 /* Track dynamic relocs copied for this symbol. */
653 struct elf_dyn_relocs *dyn_relocs;
654
655 /* Number of GOTPLT references for a function. */
656 bfd_signed_vma gotplt_refcount;
657
658 #define GOT_UNKNOWN 0
659 #define GOT_NORMAL 1
660 #define GOT_TLS_GD 2
661 #define GOT_TLS_IE 3
662 #define GOT_TLS_IE_NLT 4
663 unsigned char tls_type;
664
665 /* For pointer equality reasons we might need to change the symbol
666 type from STT_GNU_IFUNC to STT_FUNC together with its value and
667 section entry. So after alloc_dynrelocs only these values should
668 be used. In order to check whether a symbol is IFUNC use
669 s390_is_ifunc_symbol_p. */
670 bfd_vma ifunc_resolver_address;
671 asection *ifunc_resolver_section;
672 };
673
674 #define elf_s390_hash_entry(ent) \
675 ((struct elf_s390_link_hash_entry *)(ent))
676
677 /* This structure represents an entry in the local PLT list needed for
678 local IFUNC symbols. */
679 struct plt_entry
680 {
681 /* The section of the local symbol.
682 Set in relocate_section and used in finish_dynamic_sections. */
683 asection *sec;
684
685 union
686 {
687 bfd_signed_vma refcount;
688 bfd_vma offset;
689 } plt;
690 };
691
692 /* NOTE: Keep this structure in sync with
693 the one declared in elf64-s390.c. */
694 struct elf_s390_obj_tdata
695 {
696 struct elf_obj_tdata root;
697
698 /* A local PLT is needed for ifunc symbols. */
699 struct plt_entry *local_plt;
700
701 /* TLS type for each local got entry. */
702 char *local_got_tls_type;
703 };
704
705 #define elf_s390_tdata(abfd) \
706 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
707
708 #define elf_s390_local_plt(abfd) \
709 (elf_s390_tdata (abfd)->local_plt)
710
711 #define elf_s390_local_got_tls_type(abfd) \
712 (elf_s390_tdata (abfd)->local_got_tls_type)
713
714 #define is_s390_elf(bfd) \
715 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
716 && elf_tdata (bfd) != NULL \
717 && elf_object_id (bfd) == S390_ELF_DATA)
718
719 static bfd_boolean
720 elf_s390_mkobject (bfd *abfd)
721 {
722 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
723 S390_ELF_DATA);
724 }
725
726 static bfd_boolean
727 elf_s390_object_p (bfd *abfd)
728 {
729 /* Set the right machine number for an s390 elf32 file. */
730 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
731 }
732
733 /* s390 ELF linker hash table. */
734
735 struct elf_s390_link_hash_table
736 {
737 struct elf_link_hash_table elf;
738
739 /* Short-cuts to get to dynamic linker sections. */
740 asection *sdynbss;
741 asection *srelbss;
742 asection *irelifunc;
743
744 union
745 {
746 bfd_signed_vma refcount;
747 bfd_vma offset;
748 } tls_ldm_got;
749
750 /* Small local sym cache. */
751 struct sym_cache sym_cache;
752 };
753
754 /* Get the s390 ELF linker hash table from a link_info structure. */
755
756 #define elf_s390_hash_table(p) \
757 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
758 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
759
760 #undef ELF64
761 #include "elf-s390-common.c"
762
763 /* Create an entry in an s390 ELF linker hash table. */
764
765 static struct bfd_hash_entry *
766 link_hash_newfunc (struct bfd_hash_entry *entry,
767 struct bfd_hash_table *table,
768 const char *string)
769 {
770 /* Allocate the structure if it has not already been allocated by a
771 subclass. */
772 if (entry == NULL)
773 {
774 entry = bfd_hash_allocate (table,
775 sizeof (struct elf_s390_link_hash_entry));
776 if (entry == NULL)
777 return entry;
778 }
779
780 /* Call the allocation method of the superclass. */
781 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
782 if (entry != NULL)
783 {
784 struct elf_s390_link_hash_entry *eh;
785
786 eh = (struct elf_s390_link_hash_entry *) entry;
787 eh->dyn_relocs = NULL;
788 eh->gotplt_refcount = 0;
789 eh->tls_type = GOT_UNKNOWN;
790 eh->ifunc_resolver_address = 0;
791 eh->ifunc_resolver_section = NULL;
792 }
793
794 return entry;
795 }
796
797 /* Create an s390 ELF linker hash table. */
798
799 static struct bfd_link_hash_table *
800 elf_s390_link_hash_table_create (bfd *abfd)
801 {
802 struct elf_s390_link_hash_table *ret;
803 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
804
805 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
806 if (ret == NULL)
807 return NULL;
808
809 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
810 sizeof (struct elf_s390_link_hash_entry),
811 S390_ELF_DATA))
812 {
813 free (ret);
814 return NULL;
815 }
816
817 return &ret->elf.root;
818 }
819
820 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
821 shortcuts to them in our hash table. */
822
823 static bfd_boolean
824 create_got_section (bfd *dynobj, struct bfd_link_info *info)
825 {
826 struct elf_s390_link_hash_table *htab;
827
828 if (! _bfd_elf_create_got_section (dynobj, info))
829 return FALSE;
830
831 htab = elf_s390_hash_table (info);
832 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
833 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
834 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
835 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
836 abort ();
837
838 return TRUE;
839 }
840
841 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
842 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
843 hash table. */
844
845 static bfd_boolean
846 elf_s390_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
847 {
848 struct elf_s390_link_hash_table *htab;
849
850 htab = elf_s390_hash_table (info);
851 if (!htab->elf.sgot && !create_got_section (dynobj, info))
852 return FALSE;
853
854 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
855 return FALSE;
856
857 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
858 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
859 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
860 if (!info->shared)
861 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
862
863 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
864 || (!info->shared && !htab->srelbss))
865 abort ();
866
867 return TRUE;
868 }
869
870 /* Copy the extra info we tack onto an elf_link_hash_entry. */
871
872 static void
873 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
874 struct elf_link_hash_entry *dir,
875 struct elf_link_hash_entry *ind)
876 {
877 struct elf_s390_link_hash_entry *edir, *eind;
878
879 edir = (struct elf_s390_link_hash_entry *) dir;
880 eind = (struct elf_s390_link_hash_entry *) ind;
881
882 if (eind->dyn_relocs != NULL)
883 {
884 if (edir->dyn_relocs != NULL)
885 {
886 struct elf_dyn_relocs **pp;
887 struct elf_dyn_relocs *p;
888
889 /* Add reloc counts against the indirect sym to the direct sym
890 list. Merge any entries against the same section. */
891 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
892 {
893 struct elf_dyn_relocs *q;
894
895 for (q = edir->dyn_relocs; q != NULL; q = q->next)
896 if (q->sec == p->sec)
897 {
898 q->pc_count += p->pc_count;
899 q->count += p->count;
900 *pp = p->next;
901 break;
902 }
903 if (q == NULL)
904 pp = &p->next;
905 }
906 *pp = edir->dyn_relocs;
907 }
908
909 edir->dyn_relocs = eind->dyn_relocs;
910 eind->dyn_relocs = NULL;
911 }
912
913 if (ind->root.type == bfd_link_hash_indirect
914 && dir->got.refcount <= 0)
915 {
916 edir->tls_type = eind->tls_type;
917 eind->tls_type = GOT_UNKNOWN;
918 }
919
920 if (ELIMINATE_COPY_RELOCS
921 && ind->root.type != bfd_link_hash_indirect
922 && dir->dynamic_adjusted)
923 {
924 /* If called to transfer flags for a weakdef during processing
925 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
926 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
927 dir->ref_dynamic |= ind->ref_dynamic;
928 dir->ref_regular |= ind->ref_regular;
929 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
930 dir->needs_plt |= ind->needs_plt;
931 }
932 else
933 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
934 }
935
936 static int
937 elf_s390_tls_transition (struct bfd_link_info *info,
938 int r_type,
939 int is_local)
940 {
941 if (info->shared)
942 return r_type;
943
944 switch (r_type)
945 {
946 case R_390_TLS_GD32:
947 case R_390_TLS_IE32:
948 if (is_local)
949 return R_390_TLS_LE32;
950 return R_390_TLS_IE32;
951 case R_390_TLS_GOTIE32:
952 if (is_local)
953 return R_390_TLS_LE32;
954 return R_390_TLS_GOTIE32;
955 case R_390_TLS_LDM32:
956 return R_390_TLS_LE32;
957 }
958
959 return r_type;
960 }
961
962 /* Look through the relocs for a section during the first phase, and
963 allocate space in the global offset table or procedure linkage
964 table. */
965
966 static bfd_boolean
967 elf_s390_check_relocs (bfd *abfd,
968 struct bfd_link_info *info,
969 asection *sec,
970 const Elf_Internal_Rela *relocs)
971 {
972 struct elf_s390_link_hash_table *htab;
973 Elf_Internal_Shdr *symtab_hdr;
974 struct elf_link_hash_entry **sym_hashes;
975 const Elf_Internal_Rela *rel;
976 const Elf_Internal_Rela *rel_end;
977 asection *sreloc;
978 bfd_signed_vma *local_got_refcounts;
979 int tls_type, old_tls_type;
980 Elf_Internal_Sym *isym;
981
982 if (info->relocatable)
983 return TRUE;
984
985 BFD_ASSERT (is_s390_elf (abfd));
986
987 htab = elf_s390_hash_table (info);
988 symtab_hdr = &elf_symtab_hdr (abfd);
989 sym_hashes = elf_sym_hashes (abfd);
990 local_got_refcounts = elf_local_got_refcounts (abfd);
991
992 sreloc = NULL;
993
994 rel_end = relocs + sec->reloc_count;
995 for (rel = relocs; rel < rel_end; rel++)
996 {
997 unsigned int r_type;
998 unsigned long r_symndx;
999 struct elf_link_hash_entry *h;
1000
1001 r_symndx = ELF32_R_SYM (rel->r_info);
1002
1003 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1004 {
1005 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1006 abfd, r_symndx);
1007 return FALSE;
1008 }
1009
1010 if (r_symndx < symtab_hdr->sh_info)
1011 {
1012 /* A local symbol. */
1013 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1014 abfd, r_symndx);
1015 if (isym == NULL)
1016 return FALSE;
1017
1018 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1019 {
1020 struct plt_entry *plt;
1021
1022 if (htab->elf.dynobj == NULL)
1023 htab->elf.dynobj = abfd;
1024
1025 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1026 return FALSE;
1027
1028 if (local_got_refcounts == NULL)
1029 {
1030 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1031 return FALSE;
1032 local_got_refcounts = elf_local_got_refcounts (abfd);
1033 }
1034 plt = elf_s390_local_plt (abfd);
1035 plt[r_symndx].plt.refcount++;
1036 }
1037 h = NULL;
1038 }
1039 else
1040 {
1041 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1042 while (h->root.type == bfd_link_hash_indirect
1043 || h->root.type == bfd_link_hash_warning)
1044 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1045
1046 /* PR15323, ref flags aren't set for references in the same
1047 object. */
1048 h->root.non_ir_ref = 1;
1049 }
1050
1051 /* Create got section and local_got_refcounts array if they
1052 are needed. */
1053 r_type = elf_s390_tls_transition (info,
1054 ELF32_R_TYPE (rel->r_info),
1055 h == NULL);
1056 switch (r_type)
1057 {
1058 case R_390_GOT12:
1059 case R_390_GOT16:
1060 case R_390_GOT20:
1061 case R_390_GOT32:
1062 case R_390_GOTENT:
1063 case R_390_GOTPLT12:
1064 case R_390_GOTPLT16:
1065 case R_390_GOTPLT20:
1066 case R_390_GOTPLT32:
1067 case R_390_GOTPLTENT:
1068 case R_390_TLS_GD32:
1069 case R_390_TLS_GOTIE12:
1070 case R_390_TLS_GOTIE20:
1071 case R_390_TLS_GOTIE32:
1072 case R_390_TLS_IEENT:
1073 case R_390_TLS_IE32:
1074 case R_390_TLS_LDM32:
1075 if (h == NULL
1076 && local_got_refcounts == NULL)
1077 {
1078 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1079 return FALSE;
1080 local_got_refcounts = elf_local_got_refcounts (abfd);
1081 }
1082 /* Fall through. */
1083 case R_390_GOTOFF16:
1084 case R_390_GOTOFF32:
1085 case R_390_GOTPC:
1086 case R_390_GOTPCDBL:
1087 if (htab->elf.sgot == NULL)
1088 {
1089 if (htab->elf.dynobj == NULL)
1090 htab->elf.dynobj = abfd;
1091 if (!create_got_section (htab->elf.dynobj, info))
1092 return FALSE;
1093 }
1094 }
1095
1096 if (h != NULL)
1097 {
1098 if (htab->elf.dynobj == NULL)
1099 htab->elf.dynobj = abfd;
1100 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1101 return FALSE;
1102
1103 /* Make sure an IFUNC symbol defined in a non-shared object
1104 always gets a PLT slot. */
1105 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1106 {
1107 /* The symbol is called by the dynamic loader in order
1108 to resolve the relocation. So it is in fact also
1109 referenced. */
1110 h->ref_regular = 1;
1111 h->needs_plt = 1;
1112 }
1113 }
1114 switch (r_type)
1115 {
1116 case R_390_GOTOFF16:
1117 case R_390_GOTOFF32:
1118 case R_390_GOTPC:
1119 case R_390_GOTPCDBL:
1120 /* These relocs do not need a GOT slot. They just load the
1121 GOT pointer itself or address something else relative to
1122 the GOT. Since the GOT pointer has been set up above we
1123 are done. */
1124 break;
1125
1126 case R_390_PLT12DBL:
1127 case R_390_PLT16DBL:
1128 case R_390_PLT24DBL:
1129 case R_390_PLT32DBL:
1130 case R_390_PLT32:
1131 case R_390_PLTOFF16:
1132 case R_390_PLTOFF32:
1133 /* This symbol requires a procedure linkage table entry. We
1134 actually build the entry in adjust_dynamic_symbol,
1135 because this might be a case of linking PIC code which is
1136 never referenced by a dynamic object, in which case we
1137 don't need to generate a procedure linkage table entry
1138 after all. */
1139
1140 /* If this is a local symbol, we resolve it directly without
1141 creating a procedure linkage table entry. */
1142 if (h != NULL)
1143 {
1144 h->needs_plt = 1;
1145 h->plt.refcount += 1;
1146 }
1147 break;
1148
1149 case R_390_GOTPLT12:
1150 case R_390_GOTPLT16:
1151 case R_390_GOTPLT20:
1152 case R_390_GOTPLT32:
1153 case R_390_GOTPLTENT:
1154 /* This symbol requires either a procedure linkage table entry
1155 or an entry in the local got. We actually build the entry
1156 in adjust_dynamic_symbol because whether this is really a
1157 global reference can change and with it the fact if we have
1158 to create a plt entry or a local got entry. To be able to
1159 make a once global symbol a local one we have to keep track
1160 of the number of gotplt references that exist for this
1161 symbol. */
1162 if (h != NULL)
1163 {
1164 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1165 h->needs_plt = 1;
1166 h->plt.refcount += 1;
1167 }
1168 else
1169 local_got_refcounts[r_symndx] += 1;
1170 break;
1171
1172 case R_390_TLS_LDM32:
1173 htab->tls_ldm_got.refcount += 1;
1174 break;
1175
1176 case R_390_TLS_IE32:
1177 case R_390_TLS_GOTIE12:
1178 case R_390_TLS_GOTIE20:
1179 case R_390_TLS_GOTIE32:
1180 case R_390_TLS_IEENT:
1181 if (info->shared)
1182 info->flags |= DF_STATIC_TLS;
1183 /* Fall through. */
1184
1185 case R_390_GOT12:
1186 case R_390_GOT16:
1187 case R_390_GOT20:
1188 case R_390_GOT32:
1189 case R_390_GOTENT:
1190 case R_390_TLS_GD32:
1191 /* This symbol requires a global offset table entry. */
1192 switch (r_type)
1193 {
1194 default:
1195 case R_390_GOT12:
1196 case R_390_GOT16:
1197 case R_390_GOT20:
1198 case R_390_GOT32:
1199 case R_390_GOTENT:
1200 tls_type = GOT_NORMAL;
1201 break;
1202 case R_390_TLS_GD32:
1203 tls_type = GOT_TLS_GD;
1204 break;
1205 case R_390_TLS_IE32:
1206 case R_390_TLS_GOTIE32:
1207 tls_type = GOT_TLS_IE;
1208 break;
1209 case R_390_TLS_GOTIE12:
1210 case R_390_TLS_GOTIE20:
1211 case R_390_TLS_IEENT:
1212 tls_type = GOT_TLS_IE_NLT;
1213 break;
1214 }
1215
1216 if (h != NULL)
1217 {
1218 h->got.refcount += 1;
1219 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1220 }
1221 else
1222 {
1223 local_got_refcounts[r_symndx] += 1;
1224 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1225 }
1226 /* If a TLS symbol is accessed using IE at least once,
1227 there is no point to use dynamic model for it. */
1228 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1229 {
1230 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1231 {
1232 (*_bfd_error_handler)
1233 (_("%B: `%s' accessed both as normal and thread local symbol"),
1234 abfd, h->root.root.string);
1235 return FALSE;
1236 }
1237 if (old_tls_type > tls_type)
1238 tls_type = old_tls_type;
1239 }
1240
1241 if (old_tls_type != tls_type)
1242 {
1243 if (h != NULL)
1244 elf_s390_hash_entry (h)->tls_type = tls_type;
1245 else
1246 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1247 }
1248
1249 if (r_type != R_390_TLS_IE32)
1250 break;
1251 /* Fall through. */
1252
1253 case R_390_TLS_LE32:
1254 if (!info->shared)
1255 break;
1256 info->flags |= DF_STATIC_TLS;
1257 /* Fall through. */
1258
1259 case R_390_8:
1260 case R_390_16:
1261 case R_390_32:
1262 case R_390_PC16:
1263 case R_390_PC12DBL:
1264 case R_390_PC16DBL:
1265 case R_390_PC24DBL:
1266 case R_390_PC32DBL:
1267 case R_390_PC32:
1268 if (h != NULL)
1269 {
1270 /* If this reloc is in a read-only section, we might
1271 need a copy reloc. We can't check reliably at this
1272 stage whether the section is read-only, as input
1273 sections have not yet been mapped to output sections.
1274 Tentatively set the flag for now, and correct in
1275 adjust_dynamic_symbol. */
1276 h->non_got_ref = 1;
1277
1278 if (!info->shared)
1279 {
1280 /* We may need a .plt entry if the function this reloc
1281 refers to is in a shared lib. */
1282 h->plt.refcount += 1;
1283 }
1284 }
1285
1286 /* If we are creating a shared library, and this is a reloc
1287 against a global symbol, or a non PC relative reloc
1288 against a local symbol, then we need to copy the reloc
1289 into the shared library. However, if we are linking with
1290 -Bsymbolic, we do not need to copy a reloc against a
1291 global symbol which is defined in an object we are
1292 including in the link (i.e., DEF_REGULAR is set). At
1293 this point we have not seen all the input files, so it is
1294 possible that DEF_REGULAR is not set now but will be set
1295 later (it is never cleared). In case of a weak definition,
1296 DEF_REGULAR may be cleared later by a strong definition in
1297 a shared library. We account for that possibility below by
1298 storing information in the relocs_copied field of the hash
1299 table entry. A similar situation occurs when creating
1300 shared libraries and symbol visibility changes render the
1301 symbol local.
1302
1303 If on the other hand, we are creating an executable, we
1304 may need to keep relocations for symbols satisfied by a
1305 dynamic library if we manage to avoid copy relocs for the
1306 symbol. */
1307 if ((info->shared
1308 && (sec->flags & SEC_ALLOC) != 0
1309 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1310 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL
1311 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1312 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL
1313 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1314 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1315 || (h != NULL
1316 && (! SYMBOLIC_BIND (info, h)
1317 || h->root.type == bfd_link_hash_defweak
1318 || !h->def_regular))))
1319 || (ELIMINATE_COPY_RELOCS
1320 && !info->shared
1321 && (sec->flags & SEC_ALLOC) != 0
1322 && h != NULL
1323 && (h->root.type == bfd_link_hash_defweak
1324 || !h->def_regular)))
1325 {
1326 struct elf_dyn_relocs *p;
1327 struct elf_dyn_relocs **head;
1328
1329 /* We must copy these reloc types into the output file.
1330 Create a reloc section in dynobj and make room for
1331 this reloc. */
1332 if (sreloc == NULL)
1333 {
1334 if (htab->elf.dynobj == NULL)
1335 htab->elf.dynobj = abfd;
1336
1337 sreloc = _bfd_elf_make_dynamic_reloc_section
1338 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1339
1340 if (sreloc == NULL)
1341 return FALSE;
1342 }
1343
1344 /* If this is a global symbol, we count the number of
1345 relocations we need for this symbol. */
1346 if (h != NULL)
1347 {
1348 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1349 }
1350 else
1351 {
1352 /* Track dynamic relocs needed for local syms too.
1353 We really need local syms available to do this
1354 easily. Oh well. */
1355 asection *s;
1356 void *vpp;
1357
1358 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1359 abfd, r_symndx);
1360 if (isym == NULL)
1361 return FALSE;
1362
1363 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1364 if (s == NULL)
1365 s = sec;
1366
1367 vpp = &elf_section_data (s)->local_dynrel;
1368 head = (struct elf_dyn_relocs **) vpp;
1369 }
1370
1371 p = *head;
1372 if (p == NULL || p->sec != sec)
1373 {
1374 bfd_size_type amt = sizeof *p;
1375
1376 p = ((struct elf_dyn_relocs *)
1377 bfd_alloc (htab->elf.dynobj, amt));
1378 if (p == NULL)
1379 return FALSE;
1380 p->next = *head;
1381 *head = p;
1382 p->sec = sec;
1383 p->count = 0;
1384 p->pc_count = 0;
1385 }
1386
1387 p->count += 1;
1388 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1389 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL
1390 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1391 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL
1392 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1393 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1394 p->pc_count += 1;
1395 }
1396 break;
1397
1398 /* This relocation describes the C++ object vtable hierarchy.
1399 Reconstruct it for later use during GC. */
1400 case R_390_GNU_VTINHERIT:
1401 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1402 return FALSE;
1403 break;
1404
1405 /* This relocation describes which C++ vtable entries are actually
1406 used. Record for later use during GC. */
1407 case R_390_GNU_VTENTRY:
1408 BFD_ASSERT (h != NULL);
1409 if (h != NULL
1410 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1411 return FALSE;
1412 break;
1413
1414 default:
1415 break;
1416 }
1417 }
1418
1419 return TRUE;
1420 }
1421
1422 /* Return the section that should be marked against GC for a given
1423 relocation. */
1424
1425 static asection *
1426 elf_s390_gc_mark_hook (asection *sec,
1427 struct bfd_link_info *info,
1428 Elf_Internal_Rela *rel,
1429 struct elf_link_hash_entry *h,
1430 Elf_Internal_Sym *sym)
1431 {
1432 if (h != NULL)
1433 switch (ELF32_R_TYPE (rel->r_info))
1434 {
1435 case R_390_GNU_VTINHERIT:
1436 case R_390_GNU_VTENTRY:
1437 return NULL;
1438 }
1439 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1440
1441 }
1442
1443 /* Update the got entry reference counts for the section being removed. */
1444
1445 static bfd_boolean
1446 elf_s390_gc_sweep_hook (bfd *abfd,
1447 struct bfd_link_info *info,
1448 asection *sec,
1449 const Elf_Internal_Rela *relocs)
1450 {
1451 struct elf_s390_link_hash_table *htab;
1452 Elf_Internal_Shdr *symtab_hdr;
1453 struct elf_link_hash_entry **sym_hashes;
1454 bfd_signed_vma *local_got_refcounts;
1455 const Elf_Internal_Rela *rel, *relend;
1456
1457 if (info->relocatable)
1458 return TRUE;
1459
1460 htab = elf_s390_hash_table (info);
1461 if (htab == NULL)
1462 return FALSE;
1463
1464 elf_section_data (sec)->local_dynrel = NULL;
1465
1466 symtab_hdr = &elf_symtab_hdr (abfd);
1467 sym_hashes = elf_sym_hashes (abfd);
1468 local_got_refcounts = elf_local_got_refcounts (abfd);
1469
1470 relend = relocs + sec->reloc_count;
1471 for (rel = relocs; rel < relend; rel++)
1472 {
1473 unsigned long r_symndx;
1474 unsigned int r_type;
1475 struct elf_link_hash_entry *h = NULL;
1476
1477 r_symndx = ELF32_R_SYM (rel->r_info);
1478 if (r_symndx >= symtab_hdr->sh_info)
1479 {
1480 struct elf_s390_link_hash_entry *eh;
1481 struct elf_dyn_relocs **pp;
1482 struct elf_dyn_relocs *p;
1483
1484 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1485 while (h->root.type == bfd_link_hash_indirect
1486 || h->root.type == bfd_link_hash_warning)
1487 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1488 eh = (struct elf_s390_link_hash_entry *) h;
1489
1490 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1491 if (p->sec == sec)
1492 {
1493 /* Everything must go for SEC. */
1494 *pp = p->next;
1495 break;
1496 }
1497 }
1498 else
1499 {
1500 Elf_Internal_Sym *isym;
1501
1502 /* A local symbol. */
1503 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1504 abfd, r_symndx);
1505 if (isym == NULL)
1506 return FALSE;
1507
1508 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1509 {
1510 struct plt_entry *plt = elf_s390_local_plt (abfd);
1511 if (plt[r_symndx].plt.refcount > 0)
1512 plt[r_symndx].plt.refcount--;
1513 }
1514 }
1515
1516 r_type = ELF32_R_TYPE (rel->r_info);
1517 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1518 switch (r_type)
1519 {
1520 case R_390_TLS_LDM32:
1521 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1522 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1523 break;
1524
1525 case R_390_TLS_GD32:
1526 case R_390_TLS_IE32:
1527 case R_390_TLS_GOTIE12:
1528 case R_390_TLS_GOTIE20:
1529 case R_390_TLS_GOTIE32:
1530 case R_390_TLS_IEENT:
1531 case R_390_GOT12:
1532 case R_390_GOT16:
1533 case R_390_GOT20:
1534 case R_390_GOT32:
1535 case R_390_GOTOFF16:
1536 case R_390_GOTOFF32:
1537 case R_390_GOTPC:
1538 case R_390_GOTPCDBL:
1539 case R_390_GOTENT:
1540 if (h != NULL)
1541 {
1542 if (h->got.refcount > 0)
1543 h->got.refcount -= 1;
1544 }
1545 else if (local_got_refcounts != NULL)
1546 {
1547 if (local_got_refcounts[r_symndx] > 0)
1548 local_got_refcounts[r_symndx] -= 1;
1549 }
1550 break;
1551
1552 case R_390_8:
1553 case R_390_12:
1554 case R_390_16:
1555 case R_390_20:
1556 case R_390_32:
1557 case R_390_PC16:
1558 case R_390_PC12DBL:
1559 case R_390_PC16DBL:
1560 case R_390_PC24DBL:
1561 case R_390_PC32DBL:
1562 case R_390_PC32:
1563 if (info->shared)
1564 break;
1565 /* Fall through. */
1566
1567 case R_390_PLT12DBL:
1568 case R_390_PLT16DBL:
1569 case R_390_PLT24DBL:
1570 case R_390_PLT32DBL:
1571 case R_390_PLT32:
1572 case R_390_PLTOFF16:
1573 case R_390_PLTOFF32:
1574 if (h != NULL)
1575 {
1576 if (h->plt.refcount > 0)
1577 h->plt.refcount -= 1;
1578 }
1579 break;
1580
1581 case R_390_GOTPLT12:
1582 case R_390_GOTPLT16:
1583 case R_390_GOTPLT20:
1584 case R_390_GOTPLT32:
1585 case R_390_GOTPLTENT:
1586 if (h != NULL)
1587 {
1588 if (h->plt.refcount > 0)
1589 {
1590 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1591 h->plt.refcount -= 1;
1592 }
1593 }
1594 else if (local_got_refcounts != NULL)
1595 {
1596 if (local_got_refcounts[r_symndx] > 0)
1597 local_got_refcounts[r_symndx] -= 1;
1598 }
1599 break;
1600
1601 default:
1602 break;
1603 }
1604 }
1605
1606 return TRUE;
1607 }
1608
1609 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1610 entry but we found we will not create any. Called when we find we will
1611 not have any PLT for this symbol, by for example
1612 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1613 or elf_s390_size_dynamic_sections if no dynamic sections will be
1614 created (we're only linking static objects). */
1615
1616 static void
1617 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1618 {
1619 if (h->elf.root.type == bfd_link_hash_warning)
1620 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1621
1622 if (h->gotplt_refcount <= 0)
1623 return;
1624
1625 /* We simply add the number of gotplt references to the number
1626 * of got references for this symbol. */
1627 h->elf.got.refcount += h->gotplt_refcount;
1628 h->gotplt_refcount = -1;
1629 }
1630
1631 /* Adjust a symbol defined by a dynamic object and referenced by a
1632 regular object. The current definition is in some section of the
1633 dynamic object, but we're not including those sections. We have to
1634 change the definition to something the rest of the link can
1635 understand. */
1636
1637 static bfd_boolean
1638 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1639 struct elf_link_hash_entry *h)
1640 {
1641 struct elf_s390_link_hash_table *htab;
1642 asection *s;
1643
1644 /* STT_GNU_IFUNC symbol must go through PLT. */
1645 if (s390_is_ifunc_symbol_p (h))
1646 return TRUE;
1647
1648 /* If this is a function, put it in the procedure linkage table. We
1649 will fill in the contents of the procedure linkage table later
1650 (although we could actually do it here). */
1651 if (h->type == STT_FUNC
1652 || h->needs_plt)
1653 {
1654 if (h->plt.refcount <= 0
1655 || SYMBOL_CALLS_LOCAL (info, h)
1656 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1657 && h->root.type != bfd_link_hash_undefweak))
1658 {
1659 /* This case can occur if we saw a PLT32 reloc in an input
1660 file, but the symbol was never referred to by a dynamic
1661 object, or if all references were garbage collected. In
1662 such a case, we don't actually need to build a procedure
1663 linkage table, and we can just do a PC32 reloc instead. */
1664 h->plt.offset = (bfd_vma) -1;
1665 h->needs_plt = 0;
1666 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1667 }
1668
1669 return TRUE;
1670 }
1671 else
1672 /* It's possible that we incorrectly decided a .plt reloc was
1673 needed for an R_390_PC32 reloc to a non-function sym in
1674 check_relocs. We can't decide accurately between function and
1675 non-function syms in check-relocs; Objects loaded later in
1676 the link may change h->type. So fix it now. */
1677 h->plt.offset = (bfd_vma) -1;
1678
1679 /* If this is a weak symbol, and there is a real definition, the
1680 processor independent code will have arranged for us to see the
1681 real definition first, and we can just use the same value. */
1682 if (h->u.weakdef != NULL)
1683 {
1684 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1685 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1686 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1687 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1688 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1689 h->non_got_ref = h->u.weakdef->non_got_ref;
1690 return TRUE;
1691 }
1692
1693 /* This is a reference to a symbol defined by a dynamic object which
1694 is not a function. */
1695
1696 /* If we are creating a shared library, we must presume that the
1697 only references to the symbol are via the global offset table.
1698 For such cases we need not do anything here; the relocations will
1699 be handled correctly by relocate_section. */
1700 if (info->shared)
1701 return TRUE;
1702
1703 /* If there are no references to this symbol that do not use the
1704 GOT, we don't need to generate a copy reloc. */
1705 if (!h->non_got_ref)
1706 return TRUE;
1707
1708 /* If -z nocopyreloc was given, we won't generate them either. */
1709 if (info->nocopyreloc)
1710 {
1711 h->non_got_ref = 0;
1712 return TRUE;
1713 }
1714
1715 if (ELIMINATE_COPY_RELOCS)
1716 {
1717 struct elf_s390_link_hash_entry * eh;
1718 struct elf_dyn_relocs *p;
1719
1720 eh = (struct elf_s390_link_hash_entry *) h;
1721 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1722 {
1723 s = p->sec->output_section;
1724 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1725 break;
1726 }
1727
1728 /* If we didn't find any dynamic relocs in read-only sections, then
1729 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1730 if (p == NULL)
1731 {
1732 h->non_got_ref = 0;
1733 return TRUE;
1734 }
1735 }
1736
1737 /* We must allocate the symbol in our .dynbss section, which will
1738 become part of the .bss section of the executable. There will be
1739 an entry for this symbol in the .dynsym section. The dynamic
1740 object will contain position independent code, so all references
1741 from the dynamic object to this symbol will go through the global
1742 offset table. The dynamic linker will use the .dynsym entry to
1743 determine the address it must put in the global offset table, so
1744 both the dynamic object and the regular object will refer to the
1745 same memory location for the variable. */
1746
1747 htab = elf_s390_hash_table (info);
1748
1749 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1750 copy the initial value out of the dynamic object and into the
1751 runtime process image. */
1752 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1753 {
1754 htab->srelbss->size += sizeof (Elf32_External_Rela);
1755 h->needs_copy = 1;
1756 }
1757
1758 s = htab->sdynbss;
1759
1760 return _bfd_elf_adjust_dynamic_copy (h, s);
1761 }
1762
1763 /* Allocate space in .plt, .got and associated reloc sections for
1764 dynamic relocs. */
1765
1766 static bfd_boolean
1767 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1768 {
1769 struct bfd_link_info *info;
1770 struct elf_s390_link_hash_table *htab;
1771 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1772 struct elf_dyn_relocs *p;
1773
1774 if (h->root.type == bfd_link_hash_indirect)
1775 return TRUE;
1776
1777 info = (struct bfd_link_info *) inf;
1778 htab = elf_s390_hash_table (info);
1779
1780 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1781 here if it is defined and referenced in a non-shared object. */
1782 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1783 return s390_elf_allocate_ifunc_dyn_relocs (info, h,
1784 &eh->dyn_relocs);
1785 else if (htab->elf.dynamic_sections_created
1786 && h->plt.refcount > 0)
1787 {
1788 /* Make sure this symbol is output as a dynamic symbol.
1789 Undefined weak syms won't yet be marked as dynamic. */
1790 if (h->dynindx == -1
1791 && !h->forced_local)
1792 {
1793 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1794 return FALSE;
1795 }
1796
1797 if (info->shared
1798 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1799 {
1800 asection *s = htab->elf.splt;
1801
1802 /* If this is the first .plt entry, make room for the special
1803 first entry. */
1804 if (s->size == 0)
1805 s->size += PLT_FIRST_ENTRY_SIZE;
1806
1807 h->plt.offset = s->size;
1808
1809 /* If this symbol is not defined in a regular file, and we are
1810 not generating a shared library, then set the symbol to this
1811 location in the .plt. This is required to make function
1812 pointers compare as equal between the normal executable and
1813 the shared library. */
1814 if (! info->shared
1815 && !h->def_regular)
1816 {
1817 h->root.u.def.section = s;
1818 h->root.u.def.value = h->plt.offset;
1819 }
1820
1821 /* Make room for this entry. */
1822 s->size += PLT_ENTRY_SIZE;
1823
1824 /* We also need to make an entry in the .got.plt section, which
1825 will be placed in the .got section by the linker script. */
1826 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1827
1828 /* We also need to make an entry in the .rela.plt section. */
1829 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1830 }
1831 else
1832 {
1833 h->plt.offset = (bfd_vma) -1;
1834 h->needs_plt = 0;
1835 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1836 }
1837 }
1838 else
1839 {
1840 h->plt.offset = (bfd_vma) -1;
1841 h->needs_plt = 0;
1842 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1843 }
1844
1845 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1846 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1847 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1848 we can save the dynamic TLS relocation. */
1849 if (h->got.refcount > 0
1850 && !info->shared
1851 && h->dynindx == -1
1852 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1853 {
1854 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1855 /* For the GOTIE access without a literal pool entry the offset has
1856 to be stored somewhere. The immediate value in the instruction
1857 is not bit enough so the value is stored in the got. */
1858 {
1859 h->got.offset = htab->elf.sgot->size;
1860 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1861 }
1862 else
1863 h->got.offset = (bfd_vma) -1;
1864 }
1865 else if (h->got.refcount > 0)
1866 {
1867 asection *s;
1868 bfd_boolean dyn;
1869 int tls_type = elf_s390_hash_entry(h)->tls_type;
1870
1871 /* Make sure this symbol is output as a dynamic symbol.
1872 Undefined weak syms won't yet be marked as dynamic. */
1873 if (h->dynindx == -1
1874 && !h->forced_local)
1875 {
1876 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1877 return FALSE;
1878 }
1879
1880 s = htab->elf.sgot;
1881 h->got.offset = s->size;
1882 s->size += GOT_ENTRY_SIZE;
1883 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1884 if (tls_type == GOT_TLS_GD)
1885 s->size += GOT_ENTRY_SIZE;
1886 dyn = htab->elf.dynamic_sections_created;
1887 /* R_390_TLS_IE32 needs one dynamic relocation,
1888 R_390_TLS_GD32 needs one if local symbol and two if global. */
1889 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1890 || tls_type >= GOT_TLS_IE)
1891 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1892 else if (tls_type == GOT_TLS_GD)
1893 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1894 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1895 || h->root.type != bfd_link_hash_undefweak)
1896 && (info->shared
1897 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1898 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1899 }
1900 else
1901 h->got.offset = (bfd_vma) -1;
1902
1903 if (eh->dyn_relocs == NULL)
1904 return TRUE;
1905
1906 /* In the shared -Bsymbolic case, discard space allocated for
1907 dynamic pc-relative relocs against symbols which turn out to be
1908 defined in regular objects. For the normal shared case, discard
1909 space for pc-relative relocs that have become local due to symbol
1910 visibility changes. */
1911
1912 if (info->shared)
1913 {
1914 if (SYMBOL_CALLS_LOCAL (info, h))
1915 {
1916 struct elf_dyn_relocs **pp;
1917
1918 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1919 {
1920 p->count -= p->pc_count;
1921 p->pc_count = 0;
1922 if (p->count == 0)
1923 *pp = p->next;
1924 else
1925 pp = &p->next;
1926 }
1927 }
1928
1929 /* Also discard relocs on undefined weak syms with non-default
1930 visibility. */
1931 if (eh->dyn_relocs != NULL
1932 && h->root.type == bfd_link_hash_undefweak)
1933 {
1934 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1935 eh->dyn_relocs = NULL;
1936
1937 /* Make sure undefined weak symbols are output as a dynamic
1938 symbol in PIEs. */
1939 else if (h->dynindx == -1
1940 && !h->forced_local)
1941 {
1942 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1943 return FALSE;
1944 }
1945 }
1946 }
1947 else if (ELIMINATE_COPY_RELOCS)
1948 {
1949 /* For the non-shared case, discard space for relocs against
1950 symbols which turn out to need copy relocs or are not
1951 dynamic. */
1952
1953 if (!h->non_got_ref
1954 && ((h->def_dynamic
1955 && !h->def_regular)
1956 || (htab->elf.dynamic_sections_created
1957 && (h->root.type == bfd_link_hash_undefweak
1958 || h->root.type == bfd_link_hash_undefined))))
1959 {
1960 /* Make sure this symbol is output as a dynamic symbol.
1961 Undefined weak syms won't yet be marked as dynamic. */
1962 if (h->dynindx == -1
1963 && !h->forced_local)
1964 {
1965 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1966 return FALSE;
1967 }
1968
1969 /* If that succeeded, we know we'll be keeping all the
1970 relocs. */
1971 if (h->dynindx != -1)
1972 goto keep;
1973 }
1974
1975 eh->dyn_relocs = NULL;
1976
1977 keep: ;
1978 }
1979
1980 /* Finally, allocate space. */
1981 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1982 {
1983 asection *sreloc = elf_section_data (p->sec)->sreloc;
1984
1985 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1986 }
1987
1988 return TRUE;
1989 }
1990
1991 /* Find any dynamic relocs that apply to read-only sections. */
1992
1993 static bfd_boolean
1994 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1995 {
1996 struct elf_s390_link_hash_entry *eh;
1997 struct elf_dyn_relocs *p;
1998
1999 eh = (struct elf_s390_link_hash_entry *) h;
2000 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2001 {
2002 asection *s = p->sec->output_section;
2003
2004 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2005 {
2006 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2007
2008 info->flags |= DF_TEXTREL;
2009
2010 /* Not an error, just cut short the traversal. */
2011 return FALSE;
2012 }
2013 }
2014 return TRUE;
2015 }
2016
2017 /* Set the sizes of the dynamic sections. */
2018
2019 static bfd_boolean
2020 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2021 struct bfd_link_info *info)
2022 {
2023 struct elf_s390_link_hash_table *htab;
2024 bfd *dynobj;
2025 asection *s;
2026 bfd_boolean relocs;
2027 bfd *ibfd;
2028
2029 htab = elf_s390_hash_table (info);
2030 dynobj = htab->elf.dynobj;
2031 if (dynobj == NULL)
2032 abort ();
2033
2034 if (htab->elf.dynamic_sections_created)
2035 {
2036 /* Set the contents of the .interp section to the interpreter. */
2037 if (info->executable)
2038 {
2039 s = bfd_get_linker_section (dynobj, ".interp");
2040 if (s == NULL)
2041 abort ();
2042 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2043 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2044 }
2045 }
2046
2047 /* Set up .got offsets for local syms, and space for local dynamic
2048 relocs. */
2049 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2050 {
2051 bfd_signed_vma *local_got;
2052 bfd_signed_vma *end_local_got;
2053 char *local_tls_type;
2054 bfd_size_type locsymcount;
2055 Elf_Internal_Shdr *symtab_hdr;
2056 asection *srela;
2057 struct plt_entry *local_plt;
2058 unsigned int i;
2059
2060 if (! is_s390_elf (ibfd))
2061 continue;
2062
2063 for (s = ibfd->sections; s != NULL; s = s->next)
2064 {
2065 struct elf_dyn_relocs *p;
2066
2067 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2068 {
2069 if (!bfd_is_abs_section (p->sec)
2070 && bfd_is_abs_section (p->sec->output_section))
2071 {
2072 /* Input section has been discarded, either because
2073 it is a copy of a linkonce section or due to
2074 linker script /DISCARD/, so we'll be discarding
2075 the relocs too. */
2076 }
2077 else if (p->count != 0)
2078 {
2079 srela = elf_section_data (p->sec)->sreloc;
2080 srela->size += p->count * sizeof (Elf32_External_Rela);
2081 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2082 info->flags |= DF_TEXTREL;
2083 }
2084 }
2085 }
2086
2087 local_got = elf_local_got_refcounts (ibfd);
2088 if (!local_got)
2089 continue;
2090
2091 symtab_hdr = &elf_symtab_hdr (ibfd);
2092 locsymcount = symtab_hdr->sh_info;
2093 end_local_got = local_got + locsymcount;
2094 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2095 s = htab->elf.sgot;
2096 srela = htab->elf.srelgot;
2097 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2098 {
2099 if (*local_got > 0)
2100 {
2101 *local_got = s->size;
2102 s->size += GOT_ENTRY_SIZE;
2103 if (*local_tls_type == GOT_TLS_GD)
2104 s->size += GOT_ENTRY_SIZE;
2105 if (info->shared)
2106 srela->size += sizeof (Elf32_External_Rela);
2107 }
2108 else
2109 *local_got = (bfd_vma) -1;
2110 }
2111 local_plt = elf_s390_local_plt (ibfd);
2112 for (i = 0; i < symtab_hdr->sh_info; i++)
2113 {
2114 if (local_plt[i].plt.refcount > 0)
2115 {
2116 local_plt[i].plt.offset = htab->elf.iplt->size;
2117 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2118 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2119 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
2120 }
2121 else
2122 local_plt[i].plt.offset = (bfd_vma) -1;
2123 }
2124 }
2125
2126 if (htab->tls_ldm_got.refcount > 0)
2127 {
2128 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2129 relocs. */
2130 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2131 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2132 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
2133 }
2134 else
2135 htab->tls_ldm_got.offset = -1;
2136
2137 /* Allocate global sym .plt and .got entries, and space for global
2138 sym dynamic relocs. */
2139 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2140
2141 /* We now have determined the sizes of the various dynamic sections.
2142 Allocate memory for them. */
2143 relocs = FALSE;
2144 for (s = dynobj->sections; s != NULL; s = s->next)
2145 {
2146 if ((s->flags & SEC_LINKER_CREATED) == 0)
2147 continue;
2148
2149 if (s == htab->elf.splt
2150 || s == htab->elf.sgot
2151 || s == htab->elf.sgotplt
2152 || s == htab->sdynbss
2153 || s == htab->elf.iplt
2154 || s == htab->elf.igotplt
2155 || s == htab->irelifunc)
2156 {
2157 /* Strip this section if we don't need it; see the
2158 comment below. */
2159 }
2160 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2161 {
2162 if (s->size != 0)
2163 relocs = TRUE;
2164
2165 /* We use the reloc_count field as a counter if we need
2166 to copy relocs into the output file. */
2167 s->reloc_count = 0;
2168 }
2169 else
2170 {
2171 /* It's not one of our sections, so don't allocate space. */
2172 continue;
2173 }
2174
2175 if (s->size == 0)
2176 {
2177 /* If we don't need this section, strip it from the
2178 output file. This is to handle .rela.bss and
2179 .rela.plt. We must create it in
2180 create_dynamic_sections, because it must be created
2181 before the linker maps input sections to output
2182 sections. The linker does that before
2183 adjust_dynamic_symbol is called, and it is that
2184 function which decides whether anything needs to go
2185 into these sections. */
2186
2187 s->flags |= SEC_EXCLUDE;
2188 continue;
2189 }
2190
2191 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2192 continue;
2193
2194 /* Allocate memory for the section contents. We use bfd_zalloc
2195 here in case unused entries are not reclaimed before the
2196 section's contents are written out. This should not happen,
2197 but this way if it does, we get a R_390_NONE reloc instead
2198 of garbage. */
2199 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2200 if (s->contents == NULL)
2201 return FALSE;
2202 }
2203
2204 if (htab->elf.dynamic_sections_created)
2205 {
2206 /* Add some entries to the .dynamic section. We fill in the
2207 values later, in elf_s390_finish_dynamic_sections, but we
2208 must add the entries now so that we get the correct size for
2209 the .dynamic section. The DT_DEBUG entry is filled in by the
2210 dynamic linker and used by the debugger. */
2211 #define add_dynamic_entry(TAG, VAL) \
2212 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2213
2214 if (info->executable)
2215 {
2216 if (!add_dynamic_entry (DT_DEBUG, 0))
2217 return FALSE;
2218 }
2219
2220 if (htab->elf.splt->size != 0)
2221 {
2222 if (!add_dynamic_entry (DT_PLTGOT, 0)
2223 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2224 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2225 || !add_dynamic_entry (DT_JMPREL, 0))
2226 return FALSE;
2227 }
2228
2229 if (relocs)
2230 {
2231 if (!add_dynamic_entry (DT_RELA, 0)
2232 || !add_dynamic_entry (DT_RELASZ, 0)
2233 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2234 return FALSE;
2235
2236 /* If any dynamic relocs apply to a read-only section,
2237 then we need a DT_TEXTREL entry. */
2238 if ((info->flags & DF_TEXTREL) == 0)
2239 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
2240
2241 if ((info->flags & DF_TEXTREL) != 0)
2242 {
2243 if (!add_dynamic_entry (DT_TEXTREL, 0))
2244 return FALSE;
2245 }
2246 }
2247 }
2248 #undef add_dynamic_entry
2249
2250 return TRUE;
2251 }
2252
2253 /* Return the base VMA address which should be subtracted from real addresses
2254 when resolving @dtpoff relocation.
2255 This is PT_TLS segment p_vaddr. */
2256
2257 static bfd_vma
2258 dtpoff_base (struct bfd_link_info *info)
2259 {
2260 /* If tls_sec is NULL, we should have signalled an error already. */
2261 if (elf_hash_table (info)->tls_sec == NULL)
2262 return 0;
2263 return elf_hash_table (info)->tls_sec->vma;
2264 }
2265
2266 /* Return the relocation value for @tpoff relocation
2267 if STT_TLS virtual address is ADDRESS. */
2268
2269 static bfd_vma
2270 tpoff (struct bfd_link_info *info, bfd_vma address)
2271 {
2272 struct elf_link_hash_table *htab = elf_hash_table (info);
2273
2274 /* If tls_sec is NULL, we should have signalled an error already. */
2275 if (htab->tls_sec == NULL)
2276 return 0;
2277 return htab->tls_size + htab->tls_sec->vma - address;
2278 }
2279
2280 /* Complain if TLS instruction relocation is against an invalid
2281 instruction. */
2282
2283 static void
2284 invalid_tls_insn (bfd *input_bfd,
2285 asection *input_section,
2286 Elf_Internal_Rela *rel)
2287 {
2288 reloc_howto_type *howto;
2289
2290 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2291 (*_bfd_error_handler)
2292 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2293 input_bfd,
2294 input_section,
2295 (long) rel->r_offset,
2296 howto->name);
2297 bfd_set_error (bfd_error_bad_value);
2298 }
2299
2300 /* Relocate a 390 ELF section. */
2301
2302 static bfd_boolean
2303 elf_s390_relocate_section (bfd *output_bfd,
2304 struct bfd_link_info *info,
2305 bfd *input_bfd,
2306 asection *input_section,
2307 bfd_byte *contents,
2308 Elf_Internal_Rela *relocs,
2309 Elf_Internal_Sym *local_syms,
2310 asection **local_sections)
2311 {
2312 struct elf_s390_link_hash_table *htab;
2313 Elf_Internal_Shdr *symtab_hdr;
2314 struct elf_link_hash_entry **sym_hashes;
2315 bfd_vma *local_got_offsets;
2316 Elf_Internal_Rela *rel;
2317 Elf_Internal_Rela *relend;
2318
2319 BFD_ASSERT (is_s390_elf (input_bfd));
2320
2321 htab = elf_s390_hash_table (info);
2322 symtab_hdr = &elf_symtab_hdr (input_bfd);
2323 sym_hashes = elf_sym_hashes (input_bfd);
2324 local_got_offsets = elf_local_got_offsets (input_bfd);
2325
2326 rel = relocs;
2327 relend = relocs + input_section->reloc_count;
2328 for (; rel < relend; rel++)
2329 {
2330 unsigned int r_type;
2331 reloc_howto_type *howto;
2332 unsigned long r_symndx;
2333 struct elf_link_hash_entry *h;
2334 Elf_Internal_Sym *sym;
2335 asection *sec;
2336 bfd_vma off;
2337 bfd_vma relocation;
2338 bfd_boolean unresolved_reloc;
2339 bfd_reloc_status_type r;
2340 int tls_type;
2341 asection *base_got = htab->elf.sgot;
2342
2343 r_type = ELF32_R_TYPE (rel->r_info);
2344 if (r_type == (int) R_390_GNU_VTINHERIT
2345 || r_type == (int) R_390_GNU_VTENTRY)
2346 continue;
2347 if (r_type >= (int) R_390_max)
2348 {
2349 bfd_set_error (bfd_error_bad_value);
2350 return FALSE;
2351 }
2352
2353 howto = elf_howto_table + r_type;
2354 r_symndx = ELF32_R_SYM (rel->r_info);
2355
2356 h = NULL;
2357 sym = NULL;
2358 sec = NULL;
2359 unresolved_reloc = FALSE;
2360 if (r_symndx < symtab_hdr->sh_info)
2361 {
2362 sym = local_syms + r_symndx;
2363 sec = local_sections[r_symndx];
2364 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2365 {
2366 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2367 if (local_plt == NULL)
2368 return FALSE;
2369
2370 /* Address of the PLT slot. */
2371 relocation = (htab->elf.iplt->output_section->vma
2372 + htab->elf.iplt->output_offset
2373 + local_plt[r_symndx].plt.offset);
2374
2375 switch (r_type)
2376 {
2377 case R_390_PLTOFF16:
2378 case R_390_PLTOFF32:
2379 relocation -= htab->elf.sgot->output_section->vma;
2380 break;
2381 case R_390_GOTPLT12:
2382 case R_390_GOTPLT16:
2383 case R_390_GOTPLT20:
2384 case R_390_GOTPLT32:
2385 case R_390_GOTPLTENT:
2386 case R_390_GOT12:
2387 case R_390_GOT16:
2388 case R_390_GOT20:
2389 case R_390_GOT32:
2390 case R_390_GOTENT:
2391 {
2392 /* Write the PLT slot address into the GOT slot. */
2393 bfd_put_32 (output_bfd, relocation,
2394 htab->elf.sgot->contents +
2395 local_got_offsets[r_symndx]);
2396 relocation = (local_got_offsets[r_symndx] +
2397 htab->elf.sgot->output_offset);
2398
2399 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2400 relocation += htab->elf.sgot->output_section->vma;
2401 break;
2402 }
2403 default:
2404 break;
2405 }
2406 /* The output section is needed later in
2407 finish_dynamic_section when creating the dynamic
2408 relocation. */
2409 local_plt[r_symndx].sec = sec;
2410 goto do_relocation;
2411 }
2412 else
2413 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2414 }
2415 else
2416 {
2417 bfd_boolean warned ATTRIBUTE_UNUSED;
2418
2419 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2420 r_symndx, symtab_hdr, sym_hashes,
2421 h, sec, relocation,
2422 unresolved_reloc, warned);
2423 }
2424
2425 if (sec != NULL && discarded_section (sec))
2426 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2427 rel, 1, relend, howto, 0, contents);
2428
2429 if (info->relocatable)
2430 continue;
2431
2432 switch (r_type)
2433 {
2434 case R_390_GOTPLT12:
2435 case R_390_GOTPLT16:
2436 case R_390_GOTPLT20:
2437 case R_390_GOTPLT32:
2438 case R_390_GOTPLTENT:
2439 /* There are three cases for a GOTPLT relocation. 1) The
2440 relocation is against the jump slot entry of a plt that
2441 will get emitted to the output file. 2) The relocation
2442 is against the jump slot of a plt entry that has been
2443 removed. elf_s390_adjust_gotplt has created a GOT entry
2444 as replacement. 3) The relocation is against a local symbol.
2445 Cases 2) and 3) are the same as the GOT relocation code
2446 so we just have to test for case 1 and fall through for
2447 the other two. */
2448 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2449 {
2450 bfd_vma plt_index;
2451
2452 if (s390_is_ifunc_symbol_p (h))
2453 {
2454 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2455 relocation = (plt_index * GOT_ENTRY_SIZE +
2456 htab->elf.igotplt->output_offset);
2457 if (r_type == R_390_GOTPLTENT)
2458 relocation += htab->elf.igotplt->output_section->vma;
2459 }
2460 else
2461 {
2462 /* Calc. index no.
2463 Current offset - size first entry / entry size. */
2464 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2465 PLT_ENTRY_SIZE;
2466
2467 /* Offset in GOT is PLT index plus GOT headers(3)
2468 times 4, addr & GOT addr. */
2469 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2470 if (r_type == R_390_GOTPLTENT)
2471 relocation += htab->elf.sgot->output_section->vma;
2472 }
2473 unresolved_reloc = FALSE;
2474
2475 }
2476 /* Fall through. */
2477
2478 case R_390_GOT12:
2479 case R_390_GOT16:
2480 case R_390_GOT20:
2481 case R_390_GOT32:
2482 case R_390_GOTENT:
2483 /* Relocation is to the entry for this symbol in the global
2484 offset table. */
2485 if (base_got == NULL)
2486 abort ();
2487
2488 if (h != NULL)
2489 {
2490 bfd_boolean dyn;
2491
2492 off = h->got.offset;
2493 dyn = htab->elf.dynamic_sections_created;
2494
2495 if (s390_is_ifunc_symbol_p (h))
2496 {
2497 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2498 if (off == (bfd_vma)-1)
2499 {
2500 /* No explicit GOT usage so redirect to the
2501 got.iplt slot. */
2502 base_got = htab->elf.igotplt;
2503 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2504 }
2505 else
2506 {
2507 /* Explicit GOT slots must contain the address
2508 of the PLT slot. This will be handled in
2509 finish_dynamic_symbol. */
2510 }
2511 }
2512 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2513 || (info->shared
2514 && SYMBOL_REFERENCES_LOCAL (info, h))
2515 || (ELF_ST_VISIBILITY (h->other)
2516 && h->root.type == bfd_link_hash_undefweak))
2517
2518 {
2519 /* This is actually a static link, or it is a
2520 -Bsymbolic link and the symbol is defined
2521 locally, or the symbol was forced to be local
2522 because of a version file. We must initialize
2523 this entry in the global offset table. Since the
2524 offset must always be a multiple of 2, we use the
2525 least significant bit to record whether we have
2526 initialized it already.
2527
2528 When doing a dynamic link, we create a .rel.got
2529 relocation entry to initialize the value. This
2530 is done in the finish_dynamic_symbol routine. */
2531 if ((off & 1) != 0)
2532 off &= ~1;
2533 else
2534 {
2535 bfd_put_32 (output_bfd, relocation,
2536 base_got->contents + off);
2537 h->got.offset |= 1;
2538 }
2539
2540 if ((h->def_regular
2541 && info->shared
2542 && SYMBOL_REFERENCES_LOCAL (info, h))
2543 /* lrl rx,sym@GOTENT -> larl rx, sym */
2544 && ((r_type == R_390_GOTENT
2545 && (bfd_get_16 (input_bfd,
2546 contents + rel->r_offset - 2)
2547 & 0xff0f) == 0xc40d)
2548 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2549 || (r_type == R_390_GOT20
2550 && (bfd_get_32 (input_bfd,
2551 contents + rel->r_offset - 2)
2552 & 0xff00f000) == 0xe300c000
2553 && bfd_get_8 (input_bfd,
2554 contents + rel->r_offset + 3) == 0x58)))
2555 {
2556 unsigned short new_insn =
2557 (0xc000 | (bfd_get_8 (input_bfd,
2558 contents + rel->r_offset - 1) & 0xf0));
2559 bfd_put_16 (output_bfd, new_insn,
2560 contents + rel->r_offset - 2);
2561 r_type = R_390_PC32DBL;
2562 rel->r_addend = 2;
2563 howto = elf_howto_table + r_type;
2564 relocation = h->root.u.def.value
2565 + h->root.u.def.section->output_section->vma
2566 + h->root.u.def.section->output_offset;
2567 goto do_relocation;
2568 }
2569 }
2570 else
2571 unresolved_reloc = FALSE;
2572 }
2573 else
2574 {
2575 if (local_got_offsets == NULL)
2576 abort ();
2577
2578 off = local_got_offsets[r_symndx];
2579
2580 /* The offset must always be a multiple of 4. We use
2581 the least significant bit to record whether we have
2582 already generated the necessary reloc. */
2583 if ((off & 1) != 0)
2584 off &= ~1;
2585 else
2586 {
2587 bfd_put_32 (output_bfd, relocation,
2588 htab->elf.sgot->contents + off);
2589
2590 if (info->shared)
2591 {
2592 asection *srelgot;
2593 Elf_Internal_Rela outrel;
2594 bfd_byte *loc;
2595
2596 srelgot = htab->elf.srelgot;
2597 if (srelgot == NULL)
2598 abort ();
2599
2600 outrel.r_offset = (htab->elf.sgot->output_section->vma
2601 + htab->elf.sgot->output_offset
2602 + off);
2603 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2604 outrel.r_addend = relocation;
2605 loc = srelgot->contents;
2606 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2607 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2608 }
2609
2610 local_got_offsets[r_symndx] |= 1;
2611 }
2612 }
2613
2614 if (off >= (bfd_vma) -2)
2615 abort ();
2616
2617 relocation = base_got->output_offset + off;
2618
2619 /* For @GOTENT the relocation is against the offset between
2620 the instruction and the symbols entry in the GOT and not
2621 between the start of the GOT and the symbols entry. We
2622 add the vma of the GOT to get the correct value. */
2623 if ( r_type == R_390_GOTENT
2624 || r_type == R_390_GOTPLTENT)
2625 relocation += base_got->output_section->vma;
2626
2627 break;
2628
2629 case R_390_GOTOFF16:
2630 case R_390_GOTOFF32:
2631 /* Relocation is relative to the start of the global offset
2632 table. */
2633
2634 /* Note that sgot->output_offset is not involved in this
2635 calculation. We always want the start of .got. If we
2636 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2637 permitted by the ABI, we might have to change this
2638 calculation. */
2639 relocation -= htab->elf.sgot->output_section->vma;
2640 break;
2641
2642 case R_390_GOTPC:
2643 case R_390_GOTPCDBL:
2644 /* Use global offset table as symbol value. */
2645 relocation = htab->elf.sgot->output_section->vma;
2646 unresolved_reloc = FALSE;
2647 break;
2648
2649 case R_390_PLT12DBL:
2650 case R_390_PLT16DBL:
2651 case R_390_PLT24DBL:
2652 case R_390_PLT32DBL:
2653 case R_390_PLT32:
2654 /* Relocation is to the entry for this symbol in the
2655 procedure linkage table. */
2656
2657 /* Resolve a PLT32 reloc against a local symbol directly,
2658 without using the procedure linkage table. */
2659 if (h == NULL)
2660 break;
2661
2662 if (h->plt.offset == (bfd_vma) -1
2663 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2664 {
2665 /* We didn't make a PLT entry for this symbol. This
2666 happens when statically linking PIC code, or when
2667 using -Bsymbolic. */
2668 break;
2669 }
2670
2671 if (s390_is_ifunc_symbol_p (h))
2672 relocation = (htab->elf.iplt->output_section->vma
2673 + htab->elf.iplt->output_offset
2674 + h->plt.offset);
2675 else
2676 relocation = (htab->elf.splt->output_section->vma
2677 + htab->elf.splt->output_offset
2678 + h->plt.offset);
2679 unresolved_reloc = FALSE;
2680 break;
2681
2682 case R_390_PLTOFF16:
2683 case R_390_PLTOFF32:
2684 /* Relocation is to the entry for this symbol in the
2685 procedure linkage table relative to the start of the GOT. */
2686
2687 /* For local symbols or if we didn't make a PLT entry for
2688 this symbol resolve the symbol directly. */
2689 if (h == NULL
2690 || h->plt.offset == (bfd_vma) -1
2691 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2692 {
2693 relocation -= htab->elf.sgot->output_section->vma;
2694 break;
2695 }
2696
2697 if (s390_is_ifunc_symbol_p (h))
2698 relocation = (htab->elf.iplt->output_section->vma
2699 + htab->elf.iplt->output_offset
2700 + h->plt.offset
2701 - htab->elf.sgot->output_section->vma);
2702 else
2703 relocation = (htab->elf.splt->output_section->vma
2704 + htab->elf.splt->output_offset
2705 + h->plt.offset
2706 - htab->elf.sgot->output_section->vma);
2707 unresolved_reloc = FALSE;
2708 break;
2709
2710 case R_390_8:
2711 case R_390_16:
2712 case R_390_32:
2713 case R_390_PC16:
2714 case R_390_PC12DBL:
2715 case R_390_PC16DBL:
2716 case R_390_PC24DBL:
2717 case R_390_PC32DBL:
2718 case R_390_PC32:
2719 if (h != NULL
2720 && s390_is_ifunc_symbol_p (h)
2721 && h->def_regular)
2722 {
2723 if (!info->shared || !h->non_got_ref)
2724 {
2725 /* For a non-shared object STT_GNU_IFUNC symbol must
2726 go through PLT. */
2727 relocation = (htab->elf.iplt->output_section->vma
2728 + htab->elf.iplt->output_offset
2729 + h ->plt.offset);
2730 goto do_relocation;
2731 }
2732 else
2733 {
2734 /* For shared objects a runtime relocation is needed. */
2735
2736 Elf_Internal_Rela outrel;
2737 asection *sreloc;
2738
2739 /* Need a dynamic relocation to get the real function
2740 address. */
2741 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2742 info,
2743 input_section,
2744 rel->r_offset);
2745 if (outrel.r_offset == (bfd_vma) -1
2746 || outrel.r_offset == (bfd_vma) -2)
2747 abort ();
2748
2749 outrel.r_offset += (input_section->output_section->vma
2750 + input_section->output_offset);
2751
2752 if (h->dynindx == -1
2753 || h->forced_local
2754 || info->executable)
2755 {
2756 /* This symbol is resolved locally. */
2757 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2758 outrel.r_addend = (h->root.u.def.value
2759 + h->root.u.def.section->output_section->vma
2760 + h->root.u.def.section->output_offset);
2761 }
2762 else
2763 {
2764 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2765 outrel.r_addend = 0;
2766 }
2767
2768 sreloc = htab->elf.irelifunc;
2769 elf_append_rela (output_bfd, sreloc, &outrel);
2770
2771 /* If this reloc is against an external symbol, we
2772 do not want to fiddle with the addend. Otherwise,
2773 we need to include the symbol value so that it
2774 becomes an addend for the dynamic reloc. For an
2775 internal symbol, we have updated addend. */
2776 continue;
2777 }
2778 }
2779
2780 if ((input_section->flags & SEC_ALLOC) == 0)
2781 break;
2782
2783 if ((info->shared
2784 && (h == NULL
2785 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2786 || h->root.type != bfd_link_hash_undefweak)
2787 && ((r_type != R_390_PC16
2788 && r_type != R_390_PC12DBL
2789 && r_type != R_390_PC16DBL
2790 && r_type != R_390_PC24DBL
2791 && r_type != R_390_PC32DBL
2792 && r_type != R_390_PC32)
2793 || !SYMBOL_CALLS_LOCAL (info, h)))
2794 || (ELIMINATE_COPY_RELOCS
2795 && !info->shared
2796 && h != NULL
2797 && h->dynindx != -1
2798 && !h->non_got_ref
2799 && ((h->def_dynamic
2800 && !h->def_regular)
2801 || h->root.type == bfd_link_hash_undefweak
2802 || h->root.type == bfd_link_hash_undefined)))
2803 {
2804 Elf_Internal_Rela outrel;
2805 bfd_boolean skip, relocate;
2806 asection *sreloc;
2807 bfd_byte *loc;
2808
2809 /* When generating a shared object, these relocations
2810 are copied into the output file to be resolved at run
2811 time. */
2812
2813 skip = FALSE;
2814 relocate = FALSE;
2815
2816 outrel.r_offset =
2817 _bfd_elf_section_offset (output_bfd, info, input_section,
2818 rel->r_offset);
2819 if (outrel.r_offset == (bfd_vma) -1)
2820 skip = TRUE;
2821 else if (outrel.r_offset == (bfd_vma) -2)
2822 skip = TRUE, relocate = TRUE;
2823 outrel.r_offset += (input_section->output_section->vma
2824 + input_section->output_offset);
2825
2826 if (skip)
2827 memset (&outrel, 0, sizeof outrel);
2828 else if (h != NULL
2829 && h->dynindx != -1
2830 && (r_type == R_390_PC16
2831 || r_type == R_390_PC12DBL
2832 || r_type == R_390_PC16DBL
2833 || r_type == R_390_PC24DBL
2834 || r_type == R_390_PC32DBL
2835 || r_type == R_390_PC32
2836 || !info->shared
2837 || !SYMBOLIC_BIND (info, h)
2838 || !h->def_regular))
2839 {
2840 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2841 outrel.r_addend = rel->r_addend;
2842 }
2843 else
2844 {
2845 /* This symbol is local, or marked to become local. */
2846 outrel.r_addend = relocation + rel->r_addend;
2847 if (r_type == R_390_32)
2848 {
2849 relocate = TRUE;
2850 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2851 }
2852 else
2853 {
2854 long sindx;
2855
2856 if (bfd_is_abs_section (sec))
2857 sindx = 0;
2858 else if (sec == NULL || sec->owner == NULL)
2859 {
2860 bfd_set_error(bfd_error_bad_value);
2861 return FALSE;
2862 }
2863 else
2864 {
2865 asection *osec;
2866
2867 osec = sec->output_section;
2868 sindx = elf_section_data (osec)->dynindx;
2869 if (sindx == 0)
2870 {
2871 osec = htab->elf.text_index_section;
2872 sindx = elf_section_data (osec)->dynindx;
2873 }
2874 BFD_ASSERT (sindx != 0);
2875
2876 /* We are turning this relocation into one
2877 against a section symbol, so subtract out
2878 the output section's address but not the
2879 offset of the input section in the output
2880 section. */
2881 outrel.r_addend -= osec->vma;
2882 }
2883 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2884 }
2885 }
2886
2887 sreloc = elf_section_data (input_section)->sreloc;
2888 if (sreloc == NULL)
2889 abort ();
2890
2891 loc = sreloc->contents;
2892 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2893 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2894
2895 /* If this reloc is against an external symbol, we do
2896 not want to fiddle with the addend. Otherwise, we
2897 need to include the symbol value so that it becomes
2898 an addend for the dynamic reloc. */
2899 if (! relocate)
2900 continue;
2901 }
2902 break;
2903
2904 /* Relocations for tls literal pool entries. */
2905 case R_390_TLS_IE32:
2906 if (info->shared)
2907 {
2908 Elf_Internal_Rela outrel;
2909 asection *sreloc;
2910 bfd_byte *loc;
2911
2912 outrel.r_offset = rel->r_offset
2913 + input_section->output_section->vma
2914 + input_section->output_offset;
2915 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2916 sreloc = elf_section_data (input_section)->sreloc;
2917 if (sreloc == NULL)
2918 abort ();
2919 loc = sreloc->contents;
2920 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2921 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2922 }
2923 /* Fall through. */
2924
2925 case R_390_TLS_GD32:
2926 case R_390_TLS_GOTIE32:
2927 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2928 tls_type = GOT_UNKNOWN;
2929 if (h == NULL && local_got_offsets)
2930 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2931 else if (h != NULL)
2932 {
2933 tls_type = elf_s390_hash_entry(h)->tls_type;
2934 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2935 r_type = R_390_TLS_LE32;
2936 }
2937 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2938 r_type = R_390_TLS_IE32;
2939
2940 if (r_type == R_390_TLS_LE32)
2941 {
2942 /* This relocation gets optimized away by the local exec
2943 access optimization. */
2944 BFD_ASSERT (! unresolved_reloc);
2945 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2946 contents + rel->r_offset);
2947 continue;
2948 }
2949
2950 if (htab->elf.sgot == NULL)
2951 abort ();
2952
2953 if (h != NULL)
2954 off = h->got.offset;
2955 else
2956 {
2957 if (local_got_offsets == NULL)
2958 abort ();
2959
2960 off = local_got_offsets[r_symndx];
2961 }
2962
2963 emit_tls_relocs:
2964
2965 if ((off & 1) != 0)
2966 off &= ~1;
2967 else
2968 {
2969 Elf_Internal_Rela outrel;
2970 bfd_byte *loc;
2971 int dr_type, indx;
2972
2973 if (htab->elf.srelgot == NULL)
2974 abort ();
2975
2976 outrel.r_offset = (htab->elf.sgot->output_section->vma
2977 + htab->elf.sgot->output_offset + off);
2978
2979 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2980 if (r_type == R_390_TLS_GD32)
2981 dr_type = R_390_TLS_DTPMOD;
2982 else
2983 dr_type = R_390_TLS_TPOFF;
2984 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2985 outrel.r_addend = relocation - dtpoff_base (info);
2986 else
2987 outrel.r_addend = 0;
2988 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2989 loc = htab->elf.srelgot->contents;
2990 loc += htab->elf.srelgot->reloc_count++
2991 * sizeof (Elf32_External_Rela);
2992 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2993
2994 if (r_type == R_390_TLS_GD32)
2995 {
2996 if (indx == 0)
2997 {
2998 BFD_ASSERT (! unresolved_reloc);
2999 bfd_put_32 (output_bfd,
3000 relocation - dtpoff_base (info),
3001 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3002 }
3003 else
3004 {
3005 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
3006 outrel.r_offset += GOT_ENTRY_SIZE;
3007 outrel.r_addend = 0;
3008 htab->elf.srelgot->reloc_count++;
3009 loc += sizeof (Elf32_External_Rela);
3010 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3011 }
3012 }
3013
3014 if (h != NULL)
3015 h->got.offset |= 1;
3016 else
3017 local_got_offsets[r_symndx] |= 1;
3018 }
3019
3020 if (off >= (bfd_vma) -2)
3021 abort ();
3022 if (r_type == ELF32_R_TYPE (rel->r_info))
3023 {
3024 relocation = htab->elf.sgot->output_offset + off;
3025 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
3026 relocation += htab->elf.sgot->output_section->vma;
3027 unresolved_reloc = FALSE;
3028 }
3029 else
3030 {
3031 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
3032 contents + rel->r_offset);
3033 continue;
3034 }
3035 break;
3036
3037 case R_390_TLS_GOTIE12:
3038 case R_390_TLS_GOTIE20:
3039 case R_390_TLS_IEENT:
3040 if (h == NULL)
3041 {
3042 if (local_got_offsets == NULL)
3043 abort();
3044 off = local_got_offsets[r_symndx];
3045 if (info->shared)
3046 goto emit_tls_relocs;
3047 }
3048 else
3049 {
3050 off = h->got.offset;
3051 tls_type = elf_s390_hash_entry(h)->tls_type;
3052 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
3053 goto emit_tls_relocs;
3054 }
3055
3056 if (htab->elf.sgot == NULL)
3057 abort ();
3058
3059 BFD_ASSERT (! unresolved_reloc);
3060 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3061 htab->elf.sgot->contents + off);
3062 relocation = htab->elf.sgot->output_offset + off;
3063 if (r_type == R_390_TLS_IEENT)
3064 relocation += htab->elf.sgot->output_section->vma;
3065 unresolved_reloc = FALSE;
3066 break;
3067
3068 case R_390_TLS_LDM32:
3069 if (! info->shared)
3070 /* The literal pool entry this relocation refers to gets ignored
3071 by the optimized code of the local exec model. Do nothing
3072 and the value will turn out zero. */
3073 continue;
3074
3075 if (htab->elf.sgot == NULL)
3076 abort ();
3077
3078 off = htab->tls_ldm_got.offset;
3079 if (off & 1)
3080 off &= ~1;
3081 else
3082 {
3083 Elf_Internal_Rela outrel;
3084 bfd_byte *loc;
3085
3086 if (htab->elf.srelgot == NULL)
3087 abort ();
3088
3089 outrel.r_offset = (htab->elf.sgot->output_section->vma
3090 + htab->elf.sgot->output_offset + off);
3091
3092 bfd_put_32 (output_bfd, 0,
3093 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3094 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
3095 outrel.r_addend = 0;
3096 loc = htab->elf.srelgot->contents;
3097 loc += htab->elf.srelgot->reloc_count++
3098 * sizeof (Elf32_External_Rela);
3099 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3100 htab->tls_ldm_got.offset |= 1;
3101 }
3102 relocation = htab->elf.sgot->output_offset + off;
3103 unresolved_reloc = FALSE;
3104 break;
3105
3106 case R_390_TLS_LE32:
3107 if (info->shared)
3108 {
3109 /* Linking a shared library with non-fpic code requires
3110 a R_390_TLS_TPOFF relocation. */
3111 Elf_Internal_Rela outrel;
3112 asection *sreloc;
3113 bfd_byte *loc;
3114 int indx;
3115
3116 outrel.r_offset = rel->r_offset
3117 + input_section->output_section->vma
3118 + input_section->output_offset;
3119 if (h != NULL && h->dynindx != -1)
3120 indx = h->dynindx;
3121 else
3122 indx = 0;
3123 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
3124 if (indx == 0)
3125 outrel.r_addend = relocation - dtpoff_base (info);
3126 else
3127 outrel.r_addend = 0;
3128 sreloc = elf_section_data (input_section)->sreloc;
3129 if (sreloc == NULL)
3130 abort ();
3131 loc = sreloc->contents;
3132 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3133 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3134 }
3135 else
3136 {
3137 BFD_ASSERT (! unresolved_reloc);
3138 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3139 contents + rel->r_offset);
3140 }
3141 continue;
3142
3143 case R_390_TLS_LDO32:
3144 if (info->shared || (input_section->flags & SEC_DEBUGGING))
3145 relocation -= dtpoff_base (info);
3146 else
3147 /* When converting LDO to LE, we must negate. */
3148 relocation = -tpoff (info, relocation);
3149 break;
3150
3151 /* Relocations for tls instructions. */
3152 case R_390_TLS_LOAD:
3153 case R_390_TLS_GDCALL:
3154 case R_390_TLS_LDCALL:
3155 tls_type = GOT_UNKNOWN;
3156 if (h == NULL && local_got_offsets)
3157 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3158 else if (h != NULL)
3159 tls_type = elf_s390_hash_entry(h)->tls_type;
3160
3161 if (tls_type == GOT_TLS_GD)
3162 continue;
3163
3164 if (r_type == R_390_TLS_LOAD)
3165 {
3166 if (!info->shared && (h == NULL || h->dynindx == -1))
3167 {
3168 /* IE->LE transition. Four valid cases:
3169 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
3170 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
3171 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
3172 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3173 unsigned int insn, ry;
3174
3175 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3176 ry = 0;
3177 if ((insn & 0xff00f000) == 0x58000000)
3178 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
3179 ry = (insn & 0x000f0000);
3180 else if ((insn & 0xff0f0000) == 0x58000000)
3181 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
3182 ry = (insn & 0x0000f000) << 4;
3183 else if ((insn & 0xff00f000) == 0x5800c000)
3184 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
3185 ry = (insn & 0x000f0000);
3186 else if ((insn & 0xff0f0000) == 0x580c0000)
3187 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3188 ry = (insn & 0x0000f000) << 4;
3189 else
3190 invalid_tls_insn (input_bfd, input_section, rel);
3191 insn = 0x18000700 | (insn & 0x00f00000) | ry;
3192 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3193 }
3194 }
3195 else if (r_type == R_390_TLS_GDCALL)
3196 {
3197 unsigned int insn;
3198
3199 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3200 if ((insn & 0xff000fff) != 0x4d000000 &&
3201 (insn & 0xffff0000) != 0xc0e50000 &&
3202 (insn & 0xff000000) != 0x0d000000)
3203 invalid_tls_insn (input_bfd, input_section, rel);
3204 if (!info->shared && (h == NULL || h->dynindx == -1))
3205 {
3206 if ((insn & 0xff000000) == 0x0d000000)
3207 {
3208 /* GD->LE transition.
3209 basr rx, ry -> nopr r7 */
3210 insn = 0x07070000 | (insn & 0xffff);
3211 }
3212 else if ((insn & 0xff000000) == 0x4d000000)
3213 {
3214 /* GD->LE transition.
3215 bas %r14,0(%rx,%r13) -> bc 0,0 */
3216 insn = 0x47000000;
3217 }
3218 else
3219 {
3220 /* GD->LE transition.
3221 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
3222 insn = 0xc0040000;
3223 bfd_put_16 (output_bfd, 0x0000,
3224 contents + rel->r_offset + 4);
3225 }
3226 }
3227 else
3228 {
3229 /* If basr is used in the pic case to invoke
3230 _tls_get_offset, something went wrong before. */
3231 if ((insn & 0xff000000) == 0x0d000000)
3232 invalid_tls_insn (input_bfd, input_section, rel);
3233
3234 if ((insn & 0xff000000) == 0x4d000000)
3235 {
3236 /* GD->IE transition.
3237 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3238 insn = 0x5822c000;
3239 }
3240 else
3241 {
3242 /* GD->IE transition.
3243 brasl %r14,__tls_get_addr@plt ->
3244 l %r2,0(%r2,%r12) ; bcr 0,0 */
3245 insn = 0x5822c000;
3246 bfd_put_16 (output_bfd, 0x0700,
3247 contents + rel->r_offset + 4);
3248 }
3249 }
3250 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3251 }
3252 else if (r_type == R_390_TLS_LDCALL)
3253 {
3254 if (!info->shared)
3255 {
3256 unsigned int insn;
3257
3258 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3259 if ((insn & 0xff000fff) != 0x4d000000 &&
3260 (insn & 0xffff0000) != 0xc0e50000 &&
3261 (insn & 0xff000000) != 0x0d000000)
3262 invalid_tls_insn (input_bfd, input_section, rel);
3263
3264 if ((insn & 0xff000000) == 0x0d000000)
3265 {
3266 /* LD->LE transition.
3267 basr rx, ry -> nopr r7 */
3268 insn = 0x07070000 | (insn & 0xffff);
3269 }
3270 else if ((insn & 0xff000000) == 0x4d000000)
3271 {
3272 /* LD->LE transition.
3273 bas %r14,0(%rx,%r13) -> bc 0,0 */
3274 insn = 0x47000000;
3275 }
3276 else
3277 {
3278 /* LD->LE transition.
3279 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3280 insn = 0xc0040000;
3281 bfd_put_16 (output_bfd, 0x0000,
3282 contents + rel->r_offset + 4);
3283 }
3284 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3285 }
3286 }
3287 continue;
3288
3289 default:
3290 break;
3291 }
3292
3293 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3294 because such sections are not SEC_ALLOC and thus ld.so will
3295 not process them. */
3296 if (unresolved_reloc
3297 && !((input_section->flags & SEC_DEBUGGING) != 0
3298 && h->def_dynamic)
3299 && _bfd_elf_section_offset (output_bfd, info, input_section,
3300 rel->r_offset) != (bfd_vma) -1)
3301 (*_bfd_error_handler)
3302 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3303 input_bfd,
3304 input_section,
3305 (long) rel->r_offset,
3306 howto->name,
3307 h->root.root.string);
3308
3309 do_relocation:
3310
3311 /* When applying a 24 bit reloc we need to start one byte
3312 earlier. Otherwise the 32 bit get/put bfd operations might
3313 access a byte after the actual section. */
3314 if (r_type == R_390_PC24DBL
3315 || r_type == R_390_PLT24DBL)
3316 rel->r_offset--;
3317
3318 if (r_type == R_390_20
3319 || r_type == R_390_GOT20
3320 || r_type == R_390_GOTPLT20
3321 || r_type == R_390_TLS_GOTIE20)
3322 {
3323 relocation += rel->r_addend;
3324 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3325 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3326 contents, rel->r_offset,
3327 relocation, 0);
3328 }
3329 else
3330 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3331 contents, rel->r_offset,
3332 relocation, rel->r_addend);
3333
3334 if (r != bfd_reloc_ok)
3335 {
3336 const char *name;
3337
3338 if (h != NULL)
3339 name = h->root.root.string;
3340 else
3341 {
3342 name = bfd_elf_string_from_elf_section (input_bfd,
3343 symtab_hdr->sh_link,
3344 sym->st_name);
3345 if (name == NULL)
3346 return FALSE;
3347 if (*name == '\0')
3348 name = bfd_section_name (input_bfd, sec);
3349 }
3350
3351 if (r == bfd_reloc_overflow)
3352 {
3353
3354 if (! ((*info->callbacks->reloc_overflow)
3355 (info, (h ? &h->root : NULL), name, howto->name,
3356 (bfd_vma) 0, input_bfd, input_section,
3357 rel->r_offset)))
3358 return FALSE;
3359 }
3360 else
3361 {
3362 (*_bfd_error_handler)
3363 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3364 input_bfd, input_section,
3365 (long) rel->r_offset, name, (int) r);
3366 return FALSE;
3367 }
3368 }
3369 }
3370
3371 return TRUE;
3372 }
3373
3374 /* Generate the PLT slots together with the dynamic relocations needed
3375 for IFUNC symbols. */
3376
3377 static void
3378 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3379 struct bfd_link_info *info,
3380 struct elf_link_hash_entry *h,
3381 struct elf_s390_link_hash_table *htab,
3382 bfd_vma iplt_offset,
3383 bfd_vma resolver_address)
3384 {
3385 bfd_vma iplt_index;
3386 bfd_vma got_offset;
3387 bfd_vma igotiplt_offset;
3388 Elf_Internal_Rela rela;
3389 bfd_byte *loc;
3390 asection *plt, *gotplt, *relplt;
3391 bfd_vma relative_offset;
3392
3393 if (htab->elf.iplt == NULL
3394 || htab->elf.igotplt == NULL
3395 || htab->elf.irelplt == NULL)
3396 abort ();
3397
3398 gotplt = htab->elf.igotplt;
3399 relplt = htab->elf.irelplt;
3400
3401 /* Index of the PLT slot within iplt section. */
3402 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3403 plt = htab->elf.iplt;
3404 /* Offset into the igot.plt section. */
3405 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3406 /* Offset into the got section. */
3407 got_offset = igotiplt_offset + gotplt->output_offset;
3408
3409 /* S390 uses halfwords for relative branch calc! */
3410 relative_offset = - (plt->output_offset +
3411 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3412 /* If offset is > 32768, branch to a previous branch
3413 390 can only handle +-64 K jumps. */
3414 if ( -32768 > (int) relative_offset )
3415 relative_offset
3416 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3417
3418 /* Fill in the entry in the procedure linkage table. */
3419 if (!info->shared)
3420 {
3421 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3422 PLT_ENTRY_SIZE);
3423
3424 /* Adjust jump to the first plt entry. */
3425 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3426 plt->contents + iplt_offset + 20);
3427
3428 /* Push the GOT offset field. */
3429 bfd_put_32 (output_bfd,
3430 (gotplt->output_section->vma
3431 + got_offset),
3432 plt->contents + iplt_offset + 24);
3433 }
3434 else if (got_offset < 4096)
3435 {
3436 /* The GOT offset is small enough to be used directly as
3437 displacement. */
3438 memcpy (plt->contents + iplt_offset,
3439 elf_s390_plt_pic12_entry,
3440 PLT_ENTRY_SIZE);
3441
3442 /* Put in the GOT offset as displacement value. The 0xc000
3443 value comes from the first word of the plt entry. Look
3444 at the elf_s390_plt_pic16_entry content. */
3445 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3446 plt->contents + iplt_offset + 2);
3447
3448 /* Adjust the jump to the first plt entry. */
3449 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3450 plt->contents + iplt_offset + 20);
3451 }
3452 else if (got_offset < 32768)
3453 {
3454 /* The GOT offset is too big for a displacement but small
3455 enough to be a signed 16 bit immediate value as it can be
3456 used in an lhi instruction. */
3457 memcpy (plt->contents + iplt_offset,
3458 elf_s390_plt_pic16_entry,
3459 PLT_ENTRY_SIZE);
3460
3461 /* Put in the GOT offset for the lhi instruction. */
3462 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3463 plt->contents + iplt_offset + 2);
3464
3465 /* Adjust the jump to the first plt entry. */
3466 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3467 plt->contents + iplt_offset + 20);
3468 }
3469 else
3470 {
3471 memcpy (plt->contents + iplt_offset,
3472 elf_s390_plt_pic_entry,
3473 PLT_ENTRY_SIZE);
3474
3475 /* Adjust the jump to the first plt entry. */
3476 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3477 plt->contents + iplt_offset + 20);
3478
3479 /* Push the GOT offset field. */
3480 bfd_put_32 (output_bfd, got_offset,
3481 plt->contents + iplt_offset + 24);
3482 }
3483 /* Insert offset into reloc. table here. */
3484 bfd_put_32 (output_bfd, relplt->output_offset +
3485 iplt_index * RELA_ENTRY_SIZE,
3486 plt->contents + iplt_offset + 28);
3487
3488 /* Fill in the entry in the global offset table.
3489 Points to instruction after GOT offset. */
3490 bfd_put_32 (output_bfd,
3491 (plt->output_section->vma
3492 + plt->output_offset
3493 + iplt_offset
3494 + 12),
3495 gotplt->contents + igotiplt_offset);
3496
3497 /* Fill in the entry in the .rela.plt section. */
3498 rela.r_offset = gotplt->output_section->vma + got_offset;
3499
3500 if (!h
3501 || h->dynindx == -1
3502 || ((info->executable
3503 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3504 && h->def_regular))
3505 {
3506 /* The symbol can be locally resolved. */
3507 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3508 rela.r_addend = resolver_address;
3509 }
3510 else
3511 {
3512 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3513 rela.r_addend = 0;
3514 }
3515
3516 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3517 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3518 }
3519
3520 /* Finish up dynamic symbol handling. We set the contents of various
3521 dynamic sections here. */
3522
3523 static bfd_boolean
3524 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3525 struct bfd_link_info *info,
3526 struct elf_link_hash_entry *h,
3527 Elf_Internal_Sym *sym)
3528 {
3529 struct elf_s390_link_hash_table *htab;
3530 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3531
3532 htab = elf_s390_hash_table (info);
3533
3534 if (h->plt.offset != (bfd_vma) -1)
3535 {
3536 bfd_vma plt_index;
3537 bfd_vma got_offset;
3538 Elf_Internal_Rela rela;
3539 bfd_byte *loc;
3540 bfd_vma relative_offset;
3541
3542 /* This symbol has an entry in the procedure linkage table. Set
3543 it up. */
3544 if (s390_is_ifunc_symbol_p (h))
3545 {
3546 /* If we can resolve the IFUNC symbol locally we generate an
3547 IRELATIVE reloc. */
3548 elf_s390_finish_ifunc_symbol (output_bfd, info, h, htab, h->plt.offset,
3549 eh->ifunc_resolver_address +
3550 eh->ifunc_resolver_section->output_offset +
3551 eh->ifunc_resolver_section->output_section->vma);
3552 /* Fallthrough. Handling of explicit GOT slots of IFUNC
3553 symbols is below. */
3554 }
3555 else
3556 {
3557 if (h->dynindx == -1
3558 || htab->elf.splt == NULL
3559 || htab->elf.sgotplt == NULL
3560 || htab->elf.srelplt == NULL)
3561 abort ();
3562
3563 /* Calc. index no.
3564 Current offset - size first entry / entry size. */
3565 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3566
3567 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3568 addr & GOT addr. */
3569 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3570
3571 /* S390 uses halfwords for relative branch calc! */
3572 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3573 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3574 /* If offset is > 32768, branch to a previous branch
3575 390 can only handle +-64 K jumps. */
3576 if ( -32768 > (int) relative_offset )
3577 relative_offset
3578 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3579
3580 /* Fill in the entry in the procedure linkage table. */
3581 if (!info->shared)
3582 {
3583 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3584 PLT_ENTRY_SIZE);
3585
3586 /* Adjust jump to the first plt entry. */
3587 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3588 htab->elf.splt->contents + h->plt.offset + 20);
3589
3590 /* Push the GOT offset field. */
3591 bfd_put_32 (output_bfd,
3592 (htab->elf.sgotplt->output_section->vma
3593 + htab->elf.sgotplt->output_offset
3594 + got_offset),
3595 htab->elf.splt->contents + h->plt.offset + 24);
3596 }
3597 else if (got_offset < 4096)
3598 {
3599 /* The GOT offset is small enough to be used directly as
3600 displacement. */
3601 memcpy (htab->elf.splt->contents + h->plt.offset,
3602 elf_s390_plt_pic12_entry,
3603 PLT_ENTRY_SIZE);
3604
3605 /* Put in the GOT offset as displacement value. The 0xc000
3606 value comes from the first word of the plt entry. Look
3607 at the elf_s390_plt_pic16_entry content. */
3608 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3609 htab->elf.splt->contents + h->plt.offset + 2);
3610
3611 /* Adjust the jump to the first plt entry. */
3612 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3613 htab->elf.splt->contents + h->plt.offset + 20);
3614 }
3615 else if (got_offset < 32768)
3616 {
3617 /* The GOT offset is too big for a displacement but small
3618 enough to be a signed 16 bit immediate value as it can be
3619 used in an lhi instruction. */
3620 memcpy (htab->elf.splt->contents + h->plt.offset,
3621 elf_s390_plt_pic16_entry,
3622 PLT_ENTRY_SIZE);
3623
3624 /* Put in the GOT offset for the lhi instruction. */
3625 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3626 htab->elf.splt->contents + h->plt.offset + 2);
3627
3628 /* Adjust the jump to the first plt entry. */
3629 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3630 htab->elf.splt->contents + h->plt.offset + 20);
3631 }
3632 else
3633 {
3634 memcpy (htab->elf.splt->contents + h->plt.offset,
3635 elf_s390_plt_pic_entry,
3636 PLT_ENTRY_SIZE);
3637
3638 /* Adjust the jump to the first plt entry. */
3639 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3640 htab->elf.splt->contents + h->plt.offset + 20);
3641
3642 /* Push the GOT offset field. */
3643 bfd_put_32 (output_bfd, got_offset,
3644 htab->elf.splt->contents + h->plt.offset + 24);
3645 }
3646 /* Insert offset into reloc. table here. */
3647 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3648 htab->elf.splt->contents + h->plt.offset + 28);
3649
3650 /* Fill in the entry in the global offset table.
3651 Points to instruction after GOT offset. */
3652 bfd_put_32 (output_bfd,
3653 (htab->elf.splt->output_section->vma
3654 + htab->elf.splt->output_offset
3655 + h->plt.offset
3656 + 12),
3657 htab->elf.sgotplt->contents + got_offset);
3658
3659 /* Fill in the entry in the .rela.plt section. */
3660 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3661 + htab->elf.sgotplt->output_offset
3662 + got_offset);
3663 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3664 rela.r_addend = 0;
3665 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3666 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3667
3668 if (!h->def_regular)
3669 {
3670 /* Mark the symbol as undefined, rather than as defined in
3671 the .plt section. Leave the value alone. This is a clue
3672 for the dynamic linker, to make function pointer
3673 comparisons work between an application and shared
3674 library. */
3675 sym->st_shndx = SHN_UNDEF;
3676 }
3677 }
3678 }
3679
3680 if (h->got.offset != (bfd_vma) -1
3681 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3682 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3683 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3684 {
3685 Elf_Internal_Rela rela;
3686 bfd_byte *loc;
3687
3688 /* This symbol has an entry in the global offset table. Set it
3689 up. */
3690
3691 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3692 abort ();
3693
3694 rela.r_offset = (htab->elf.sgot->output_section->vma
3695 + htab->elf.sgot->output_offset
3696 + (h->got.offset &~ (bfd_vma) 1));
3697
3698 /* If this is a static link, or it is a -Bsymbolic link and the
3699 symbol is defined locally or was forced to be local because
3700 of a version file, we just want to emit a RELATIVE reloc.
3701 The entry in the global offset table will already have been
3702 initialized in the relocate_section function. */
3703 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3704 {
3705 if (info->shared)
3706 {
3707 /* An explicit GOT slot usage needs GLOB_DAT. If the
3708 symbol references local the implicit got.iplt slot
3709 will be used and the IRELATIVE reloc has been created
3710 above. */
3711 goto do_glob_dat;
3712 }
3713 else
3714 {
3715 /* For non-shared objects explicit GOT slots must be
3716 filled with the PLT slot address for pointer
3717 equality reasons. */
3718 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3719 + htab->elf.iplt->output_offset
3720 + h->plt.offset),
3721 htab->elf.sgot->contents + h->got.offset);
3722 return TRUE;
3723 }
3724 }
3725 else if (info->shared
3726 && SYMBOL_REFERENCES_LOCAL (info, h))
3727 {
3728 /* If this is a static link, or it is a -Bsymbolic link and
3729 the symbol is defined locally or was forced to be local
3730 because of a version file, we just want to emit a
3731 RELATIVE reloc. The entry in the global offset table
3732 will already have been initialized in the
3733 relocate_section function. */
3734 if (!h->def_regular)
3735 return FALSE;
3736 BFD_ASSERT((h->got.offset & 1) != 0);
3737 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3738 rela.r_addend = (h->root.u.def.value
3739 + h->root.u.def.section->output_section->vma
3740 + h->root.u.def.section->output_offset);
3741 }
3742 else
3743 {
3744 BFD_ASSERT((h->got.offset & 1) == 0);
3745 do_glob_dat:
3746 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3747 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3748 rela.r_addend = 0;
3749 }
3750
3751 loc = htab->elf.srelgot->contents;
3752 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3753 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3754 }
3755
3756 if (h->needs_copy)
3757 {
3758 Elf_Internal_Rela rela;
3759 bfd_byte *loc;
3760
3761 /* This symbols needs a copy reloc. Set it up. */
3762
3763 if (h->dynindx == -1
3764 || (h->root.type != bfd_link_hash_defined
3765 && h->root.type != bfd_link_hash_defweak)
3766 || htab->srelbss == NULL)
3767 abort ();
3768
3769 rela.r_offset = (h->root.u.def.value
3770 + h->root.u.def.section->output_section->vma
3771 + h->root.u.def.section->output_offset);
3772 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3773 rela.r_addend = 0;
3774 loc = htab->srelbss->contents;
3775 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3776 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3777 }
3778
3779 /* Mark some specially defined symbols as absolute. */
3780 if (h == htab->elf.hdynamic
3781 || h == htab->elf.hgot
3782 || h == htab->elf.hplt)
3783 sym->st_shndx = SHN_ABS;
3784
3785 return TRUE;
3786 }
3787
3788 /* Used to decide how to sort relocs in an optimal manner for the
3789 dynamic linker, before writing them out. */
3790
3791 static enum elf_reloc_type_class
3792 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3793 const asection *rel_sec ATTRIBUTE_UNUSED,
3794 const Elf_Internal_Rela *rela)
3795 {
3796 switch ((int) ELF32_R_TYPE (rela->r_info))
3797 {
3798 case R_390_RELATIVE:
3799 return reloc_class_relative;
3800 case R_390_JMP_SLOT:
3801 return reloc_class_plt;
3802 case R_390_COPY:
3803 return reloc_class_copy;
3804 default:
3805 return reloc_class_normal;
3806 }
3807 }
3808
3809 /* Finish up the dynamic sections. */
3810
3811 static bfd_boolean
3812 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3813 struct bfd_link_info *info)
3814 {
3815 struct elf_s390_link_hash_table *htab;
3816 bfd *dynobj;
3817 asection *sdyn;
3818 bfd *ibfd;
3819 unsigned int i;
3820
3821 htab = elf_s390_hash_table (info);
3822 dynobj = htab->elf.dynobj;
3823 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3824
3825 if (htab->elf.dynamic_sections_created)
3826 {
3827 Elf32_External_Dyn *dyncon, *dynconend;
3828
3829 if (sdyn == NULL || htab->elf.sgot == NULL)
3830 abort ();
3831
3832 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3833 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3834 for (; dyncon < dynconend; dyncon++)
3835 {
3836 Elf_Internal_Dyn dyn;
3837 asection *s;
3838
3839 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3840
3841 switch (dyn.d_tag)
3842 {
3843 default:
3844 continue;
3845
3846 case DT_PLTGOT:
3847 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma;
3848 break;
3849
3850 case DT_JMPREL:
3851 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
3852 break;
3853
3854 case DT_PLTRELSZ:
3855 s = htab->elf.srelplt->output_section;
3856 dyn.d_un.d_val = s->size;
3857 break;
3858 }
3859
3860 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3861 }
3862
3863 /* Fill in the special first entry in the procedure linkage table. */
3864 if (htab->elf.splt && htab->elf.splt->size > 0)
3865 {
3866 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3867 if (info->shared)
3868 {
3869 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3870 PLT_FIRST_ENTRY_SIZE);
3871 }
3872 else
3873 {
3874 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3875 PLT_FIRST_ENTRY_SIZE);
3876 bfd_put_32 (output_bfd,
3877 htab->elf.sgotplt->output_section->vma
3878 + htab->elf.sgotplt->output_offset,
3879 htab->elf.splt->contents + 24);
3880 }
3881 elf_section_data (htab->elf.splt->output_section)
3882 ->this_hdr.sh_entsize = 4;
3883 }
3884
3885 }
3886
3887 if (htab->elf.sgotplt)
3888 {
3889 /* Fill in the first three entries in the global offset table. */
3890 if (htab->elf.sgotplt->size > 0)
3891 {
3892 bfd_put_32 (output_bfd,
3893 (sdyn == NULL ? (bfd_vma) 0
3894 : sdyn->output_section->vma + sdyn->output_offset),
3895 htab->elf.sgotplt->contents);
3896 /* One entry for shared object struct ptr. */
3897 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3898 /* One entry for _dl_runtime_resolve. */
3899 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3900 }
3901
3902 elf_section_data (htab->elf.sgotplt->output_section)
3903 ->this_hdr.sh_entsize = 4;
3904 }
3905 /* Finish dynamic symbol for local IFUNC symbols. */
3906 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
3907 {
3908 struct plt_entry *local_plt;
3909 Elf_Internal_Sym *isym;
3910 Elf_Internal_Shdr *symtab_hdr;
3911
3912 symtab_hdr = &elf_symtab_hdr (ibfd);
3913
3914 local_plt = elf_s390_local_plt (ibfd);
3915 if (local_plt != NULL)
3916 for (i = 0; i < symtab_hdr->sh_info; i++)
3917 {
3918 if (local_plt[i].plt.offset != (bfd_vma) -1)
3919 {
3920 asection *sec = local_plt[i].sec;
3921 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3922 if (isym == NULL)
3923 return FALSE;
3924
3925 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3926 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3927 local_plt[i].plt.offset,
3928 isym->st_value
3929 + sec->output_section->vma
3930 + sec->output_offset);
3931
3932 }
3933 }
3934 }
3935 return TRUE;
3936 }
3937
3938 static bfd_boolean
3939 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3940 {
3941 int offset;
3942 unsigned int size;
3943
3944 switch (note->descsz)
3945 {
3946 default:
3947 return FALSE;
3948
3949 case 224: /* S/390 Linux. */
3950 /* pr_cursig */
3951 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3952
3953 /* pr_pid */
3954 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
3955
3956 /* pr_reg */
3957 offset = 72;
3958 size = 144;
3959 break;
3960 }
3961
3962 /* Make a ".reg/999" section. */
3963 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3964 size, note->descpos + offset);
3965 }
3966
3967 /* Return address for Ith PLT stub in section PLT, for relocation REL
3968 or (bfd_vma) -1 if it should not be included. */
3969
3970 static bfd_vma
3971 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3972 const arelent *rel ATTRIBUTE_UNUSED)
3973 {
3974 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3975 }
3976
3977 static bfd_boolean
3978 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3979 {
3980 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3981 return TRUE;
3982 }
3983
3984
3985 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3986 #define TARGET_BIG_NAME "elf32-s390"
3987 #define ELF_ARCH bfd_arch_s390
3988 #define ELF_TARGET_ID S390_ELF_DATA
3989 #define ELF_MACHINE_CODE EM_S390
3990 #define ELF_MACHINE_ALT1 EM_S390_OLD
3991 #define ELF_MAXPAGESIZE 0x1000
3992
3993 #define elf_backend_can_gc_sections 1
3994 #define elf_backend_can_refcount 1
3995 #define elf_backend_want_got_plt 1
3996 #define elf_backend_plt_readonly 1
3997 #define elf_backend_want_plt_sym 0
3998 #define elf_backend_got_header_size 12
3999 #define elf_backend_rela_normal 1
4000
4001 #define elf_info_to_howto elf_s390_info_to_howto
4002
4003 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
4004 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
4005 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
4006 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
4007
4008 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
4009
4010 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
4011 #define elf_backend_check_relocs elf_s390_check_relocs
4012 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
4013 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
4014 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
4015 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
4016 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
4017 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
4018 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
4019 #define elf_backend_relocate_section elf_s390_relocate_section
4020 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
4021 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4022 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
4023 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
4024 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
4025
4026 #define bfd_elf32_mkobject elf_s390_mkobject
4027 #define elf_backend_object_p elf_s390_object_p
4028
4029 #include "elf32-target.h"
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