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2012-09-03 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
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 = short, 2 = long) */
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 };
165
166 /* GNU extension to record C++ vtable hierarchy. */
167 static reloc_howto_type elf32_s390_vtinherit_howto =
168 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
169 static reloc_howto_type elf32_s390_vtentry_howto =
170 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);
171
172 static reloc_howto_type *
173 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
174 bfd_reloc_code_real_type code)
175 {
176 switch (code)
177 {
178 case BFD_RELOC_NONE:
179 return &elf_howto_table[(int) R_390_NONE];
180 case BFD_RELOC_8:
181 return &elf_howto_table[(int) R_390_8];
182 case BFD_RELOC_390_12:
183 return &elf_howto_table[(int) R_390_12];
184 case BFD_RELOC_16:
185 return &elf_howto_table[(int) R_390_16];
186 case BFD_RELOC_32:
187 return &elf_howto_table[(int) R_390_32];
188 case BFD_RELOC_CTOR:
189 return &elf_howto_table[(int) R_390_32];
190 case BFD_RELOC_32_PCREL:
191 return &elf_howto_table[(int) R_390_PC32];
192 case BFD_RELOC_390_GOT12:
193 return &elf_howto_table[(int) R_390_GOT12];
194 case BFD_RELOC_32_GOT_PCREL:
195 return &elf_howto_table[(int) R_390_GOT32];
196 case BFD_RELOC_390_PLT32:
197 return &elf_howto_table[(int) R_390_PLT32];
198 case BFD_RELOC_390_COPY:
199 return &elf_howto_table[(int) R_390_COPY];
200 case BFD_RELOC_390_GLOB_DAT:
201 return &elf_howto_table[(int) R_390_GLOB_DAT];
202 case BFD_RELOC_390_JMP_SLOT:
203 return &elf_howto_table[(int) R_390_JMP_SLOT];
204 case BFD_RELOC_390_RELATIVE:
205 return &elf_howto_table[(int) R_390_RELATIVE];
206 case BFD_RELOC_32_GOTOFF:
207 return &elf_howto_table[(int) R_390_GOTOFF32];
208 case BFD_RELOC_390_GOTPC:
209 return &elf_howto_table[(int) R_390_GOTPC];
210 case BFD_RELOC_390_GOT16:
211 return &elf_howto_table[(int) R_390_GOT16];
212 case BFD_RELOC_16_PCREL:
213 return &elf_howto_table[(int) R_390_PC16];
214 case BFD_RELOC_390_PC16DBL:
215 return &elf_howto_table[(int) R_390_PC16DBL];
216 case BFD_RELOC_390_PLT16DBL:
217 return &elf_howto_table[(int) R_390_PLT16DBL];
218 case BFD_RELOC_390_PC32DBL:
219 return &elf_howto_table[(int) R_390_PC32DBL];
220 case BFD_RELOC_390_PLT32DBL:
221 return &elf_howto_table[(int) R_390_PLT32DBL];
222 case BFD_RELOC_390_GOTPCDBL:
223 return &elf_howto_table[(int) R_390_GOTPCDBL];
224 case BFD_RELOC_390_GOTENT:
225 return &elf_howto_table[(int) R_390_GOTENT];
226 case BFD_RELOC_16_GOTOFF:
227 return &elf_howto_table[(int) R_390_GOTOFF16];
228 case BFD_RELOC_390_GOTPLT12:
229 return &elf_howto_table[(int) R_390_GOTPLT12];
230 case BFD_RELOC_390_GOTPLT16:
231 return &elf_howto_table[(int) R_390_GOTPLT16];
232 case BFD_RELOC_390_GOTPLT32:
233 return &elf_howto_table[(int) R_390_GOTPLT32];
234 case BFD_RELOC_390_GOTPLTENT:
235 return &elf_howto_table[(int) R_390_GOTPLTENT];
236 case BFD_RELOC_390_PLTOFF16:
237 return &elf_howto_table[(int) R_390_PLTOFF16];
238 case BFD_RELOC_390_PLTOFF32:
239 return &elf_howto_table[(int) R_390_PLTOFF32];
240 case BFD_RELOC_390_TLS_LOAD:
241 return &elf_howto_table[(int) R_390_TLS_LOAD];
242 case BFD_RELOC_390_TLS_GDCALL:
243 return &elf_howto_table[(int) R_390_TLS_GDCALL];
244 case BFD_RELOC_390_TLS_LDCALL:
245 return &elf_howto_table[(int) R_390_TLS_LDCALL];
246 case BFD_RELOC_390_TLS_GD32:
247 return &elf_howto_table[(int) R_390_TLS_GD32];
248 case BFD_RELOC_390_TLS_GOTIE12:
249 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
250 case BFD_RELOC_390_TLS_GOTIE32:
251 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
252 case BFD_RELOC_390_TLS_LDM32:
253 return &elf_howto_table[(int) R_390_TLS_LDM32];
254 case BFD_RELOC_390_TLS_IE32:
255 return &elf_howto_table[(int) R_390_TLS_IE32];
256 case BFD_RELOC_390_TLS_IEENT:
257 return &elf_howto_table[(int) R_390_TLS_IEENT];
258 case BFD_RELOC_390_TLS_LE32:
259 return &elf_howto_table[(int) R_390_TLS_LE32];
260 case BFD_RELOC_390_TLS_LDO32:
261 return &elf_howto_table[(int) R_390_TLS_LDO32];
262 case BFD_RELOC_390_TLS_DTPMOD:
263 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
264 case BFD_RELOC_390_TLS_DTPOFF:
265 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
266 case BFD_RELOC_390_TLS_TPOFF:
267 return &elf_howto_table[(int) R_390_TLS_TPOFF];
268 case BFD_RELOC_390_20:
269 return &elf_howto_table[(int) R_390_20];
270 case BFD_RELOC_390_GOT20:
271 return &elf_howto_table[(int) R_390_GOT20];
272 case BFD_RELOC_390_GOTPLT20:
273 return &elf_howto_table[(int) R_390_GOTPLT20];
274 case BFD_RELOC_390_TLS_GOTIE20:
275 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
276 case BFD_RELOC_390_IRELATIVE:
277 return &elf_howto_table[(int) R_390_IRELATIVE];
278 case BFD_RELOC_VTABLE_INHERIT:
279 return &elf32_s390_vtinherit_howto;
280 case BFD_RELOC_VTABLE_ENTRY:
281 return &elf32_s390_vtentry_howto;
282 default:
283 break;
284 }
285 return 0;
286 }
287
288 static reloc_howto_type *
289 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
290 const char *r_name)
291 {
292 unsigned int i;
293
294 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
295 if (elf_howto_table[i].name != NULL
296 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
297 return &elf_howto_table[i];
298
299 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
300 return &elf32_s390_vtinherit_howto;
301 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
302 return &elf32_s390_vtentry_howto;
303
304 return NULL;
305 }
306
307 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
308 and elf32-s390.c has its own copy. */
309
310 static void
311 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
312 arelent *cache_ptr,
313 Elf_Internal_Rela *dst)
314 {
315 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
316 switch (r_type)
317 {
318 case R_390_GNU_VTINHERIT:
319 cache_ptr->howto = &elf32_s390_vtinherit_howto;
320 break;
321
322 case R_390_GNU_VTENTRY:
323 cache_ptr->howto = &elf32_s390_vtentry_howto;
324 break;
325
326 default:
327 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
328 {
329 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
330 abfd, (int) r_type);
331 r_type = R_390_NONE;
332 }
333 cache_ptr->howto = &elf_howto_table[r_type];
334 }
335 }
336
337 /* A relocation function which doesn't do anything. */
338 static bfd_reloc_status_type
339 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
340 arelent *reloc_entry,
341 asymbol *symbol ATTRIBUTE_UNUSED,
342 void * data ATTRIBUTE_UNUSED,
343 asection *input_section,
344 bfd *output_bfd,
345 char **error_message ATTRIBUTE_UNUSED)
346 {
347 if (output_bfd)
348 reloc_entry->address += input_section->output_offset;
349 return bfd_reloc_ok;
350 }
351
352 /* Handle the large displacement relocs. */
353 static bfd_reloc_status_type
354 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED,
355 arelent *reloc_entry,
356 asymbol *symbol,
357 void * data ATTRIBUTE_UNUSED,
358 asection *input_section,
359 bfd *output_bfd,
360 char **error_message ATTRIBUTE_UNUSED)
361 {
362 reloc_howto_type *howto = reloc_entry->howto;
363 bfd_vma relocation;
364 bfd_vma insn;
365
366 if (output_bfd != (bfd *) NULL
367 && (symbol->flags & BSF_SECTION_SYM) == 0
368 && (! howto->partial_inplace
369 || reloc_entry->addend == 0))
370 {
371 reloc_entry->address += input_section->output_offset;
372 return bfd_reloc_ok;
373 }
374
375 if (output_bfd != NULL)
376 return bfd_reloc_continue;
377
378 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
379 return bfd_reloc_outofrange;
380
381 relocation = (symbol->value
382 + symbol->section->output_section->vma
383 + symbol->section->output_offset);
384 relocation += reloc_entry->addend;
385 if (howto->pc_relative)
386 {
387 relocation -= (input_section->output_section->vma
388 + input_section->output_offset);
389 relocation -= reloc_entry->address;
390 }
391
392 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
393 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
394 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
395
396 if ((bfd_signed_vma) relocation < - 0x80000
397 || (bfd_signed_vma) relocation > 0x7ffff)
398 return bfd_reloc_overflow;
399 else
400 return bfd_reloc_ok;
401 }
402
403 static bfd_boolean
404 elf_s390_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411
412 /* Functions for the 390 ELF linker. */
413
414 /* The name of the dynamic interpreter. This is put in the .interp
415 section. */
416
417 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
418
419 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
420 copying dynamic variables from a shared lib into an app's dynbss
421 section, and instead use a dynamic relocation to point into the
422 shared lib. */
423 #define ELIMINATE_COPY_RELOCS 1
424
425 /* The size in bytes of the first entry in the procedure linkage table. */
426 #define PLT_FIRST_ENTRY_SIZE 32
427 /* The size in bytes of an entry in the procedure linkage table. */
428 #define PLT_ENTRY_SIZE 32
429
430 #define GOT_ENTRY_SIZE 4
431
432 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela)
433
434 /* The first three entries in a procedure linkage table are reserved,
435 and the initial contents are unimportant (we zero them out).
436 Subsequent entries look like this. See the SVR4 ABI 386
437 supplement to see how this works. */
438
439 /* For the s390, simple addr offset can only be 0 - 4096.
440 To use the full 2 GB address space, several instructions
441 are needed to load an address in a register and execute
442 a branch( or just saving the address)
443
444 Furthermore, only r 0 and 1 are free to use!!! */
445
446 /* The first 3 words in the GOT are then reserved.
447 Word 0 is the address of the dynamic table.
448 Word 1 is a pointer to a structure describing the object
449 Word 2 is used to point to the loader entry address.
450
451 The code for position independent PLT entries looks like this:
452
453 r12 holds addr of the current GOT at entry to the PLT
454
455 The GOT holds the address in the PLT to be executed.
456 The loader then gets:
457 24(15) = Pointer to the structure describing the object.
458 28(15) = Offset into rela.plt
459
460 The loader must then find the module where the function is
461 and insert the address in the GOT.
462
463 Note: 390 can only address +- 64 K relative.
464 We check if offset > 65536, then make a relative branch -64xxx
465 back to a previous defined branch
466
467 PLT1: BASR 1,0 # 2 bytes
468 L 1,22(1) # 4 bytes Load offset in GOT in r 1
469 L 1,(1,12) # 4 bytes Load address from GOT in r1
470 BCR 15,1 # 2 bytes Jump to address
471 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
472 L 1,14(1) # 4 bytes Load offset in symol table in r1
473 BRC 15,-x # 4 bytes Jump to start of PLT
474 .word 0 # 2 bytes filler
475 .long ? # 4 bytes offset in GOT
476 .long ? # 4 bytes offset into rela.plt
477
478 This was the general case. There are two additional, optimizes PLT
479 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
480 First the one for GOT offsets < 4096:
481
482 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
483 BCR 15,1 # 2 bytes Jump to address
484 .word 0,0,0 # 6 bytes filler
485 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
486 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
487 BRC 15,-x # 4 bytes Jump to start of PLT
488 .word 0,0,0 # 6 bytes filler
489 .long ? # 4 bytes offset into rela.plt
490
491 Second the one for GOT offsets < 32768:
492
493 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
494 L 1,(1,12) # 4 bytes Load address from GOT to r1
495 BCR 15,1 # 2 bytes Jump to address
496 .word 0 # 2 bytes filler
497 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
498 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
499 BRC 15,-x # 4 bytes Jump to start of PLT
500 .word 0,0,0 # 6 bytes filler
501 .long ? # 4 bytes offset into rela.plt
502
503 Total = 32 bytes per PLT entry
504
505 The code for static build PLT entries looks like this:
506
507 PLT1: BASR 1,0 # 2 bytes
508 L 1,22(1) # 4 bytes Load address of GOT entry
509 L 1,0(0,1) # 4 bytes Load address from GOT in r1
510 BCR 15,1 # 2 bytes Jump to address
511 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
512 L 1,14(1) # 4 bytes Load offset in symbol table in r1
513 BRC 15,-x # 4 bytes Jump to start of PLT
514 .word 0 # 2 bytes filler
515 .long ? # 4 bytes address of GOT entry
516 .long ? # 4 bytes offset into rela.plt */
517
518 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] =
519 {
520 0x0d, 0x10, /* basr %r1,%r0 */
521 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
522 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */
523 0x07, 0xf1, /* br %r1 */
524 0x0d, 0x10, /* basr %r1,%r0 */
525 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
526 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
527 0x00, 0x00, /* padding */
528 0x00, 0x00, 0x00, 0x00, /* GOT offset */
529 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
530 };
531
532 /* Generic PLT pic entry. */
533 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] =
534 {
535 0x0d, 0x10, /* basr %r1,%r0 */
536 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
537 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
538 0x07, 0xf1, /* br %r1 */
539 0x0d, 0x10, /* basr %r1,%r0 */
540 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
541 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
542 0x00, 0x00, /* padding */
543 0x00, 0x00, 0x00, 0x00, /* GOT offset */
544 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
545 };
546
547 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced
548 when generating the PLT slot with the GOT offset. */
549 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] =
550 {
551 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */
552 0x07, 0xf1, /* br %r1 */
553 0x00, 0x00, 0x00, 0x00, /* padding */
554 0x00, 0x00,
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, 0x00, 0x00,
559 0x00, 0x00, 0x00, 0x00
560 };
561
562 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced
563 when generating the PLT slot with the GOT offset. */
564 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] =
565 {
566 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */
567 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
568 0x07, 0xf1, /* br %r1 */
569 0x00, 0x00,
570 0x0d, 0x10, /* basr %r1,%r0 */
571 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
572 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
573 0x00, 0x00, 0x00, 0x00,
574 0x00, 0x00, 0x00, 0x00,
575 0x00, 0x00
576 };
577
578 /* The first PLT entry pushes the offset into the rela.plt
579 from R1 onto the stack at 8(15) and the loader object info
580 at 12(15), loads the loader address in R1 and jumps to it. */
581
582 /* The first entry in the PLT for PIC code:
583
584 PLT0:
585 ST 1,28(15) # R1 has offset into rela.plt
586 L 1,4(12) # Get loader ino(object struct address)
587 ST 1,24(15) # Store address
588 L 1,8(12) # Entry address of loader in R1
589 BR 1 # Jump to loader
590
591 The first entry in the PLT for static code:
592
593 PLT0:
594 ST 1,28(15) # R1 has offset into rela.plt
595 BASR 1,0
596 L 1,18(0,1) # Get address of GOT
597 MVC 24(4,15),4(1) # Move loader ino to stack
598 L 1,8(1) # Get address of loader
599 BR 1 # Jump to loader
600 .word 0 # filler
601 .long got # address of GOT */
602
603 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] =
604 {
605 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
606 0x0d, 0x10, /* basr %r1,%r0 */
607 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */
608 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */
609 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */
610 0x07, 0xf1, /* br %r1 */
611 0x00, 0x00, 0x00, 0x00,
612 0x00, 0x00, 0x00, 0x00,
613 0x00, 0x00
614 };
615
616 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] =
617 {
618 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
619 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */
620 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */
621 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */
622 0x07, 0xf1, /* br %r1 */
623 0x00, 0x00, 0x00, 0x00,
624 0x00, 0x00, 0x00, 0x00,
625 0x00, 0x00, 0x00, 0x00,
626 0x00, 0x00
627 };
628
629
630 /* s390 ELF linker hash entry. */
631
632 struct elf_s390_link_hash_entry
633 {
634 struct elf_link_hash_entry elf;
635
636 /* Track dynamic relocs copied for this symbol. */
637 struct elf_dyn_relocs *dyn_relocs;
638
639 /* Number of GOTPLT references for a function. */
640 bfd_signed_vma gotplt_refcount;
641
642 #define GOT_UNKNOWN 0
643 #define GOT_NORMAL 1
644 #define GOT_TLS_GD 2
645 #define GOT_TLS_IE 3
646 #define GOT_TLS_IE_NLT 4
647 unsigned char tls_type;
648
649 /* For pointer equality reasons we might need to change the symbol
650 type from STT_GNU_IFUNC to STT_FUNC together with its value and
651 section entry. So after alloc_dynrelocs only these values should
652 be used. In order to check whether a symbol is IFUNC use
653 s390_is_ifunc_symbol_p. */
654 bfd_vma ifunc_resolver_address;
655 asection *ifunc_resolver_section;
656 };
657
658 #define elf_s390_hash_entry(ent) \
659 ((struct elf_s390_link_hash_entry *)(ent))
660
661 /* This structure represents an entry in the local PLT list needed for
662 local IFUNC symbols. */
663 struct plt_entry
664 {
665 /* The section of the local symbol.
666 Set in relocate_section and used in finish_dynamic_sections. */
667 asection *sec;
668
669 union
670 {
671 bfd_signed_vma refcount;
672 bfd_vma offset;
673 } plt;
674 };
675
676 /* NOTE: Keep this structure in sync with
677 the one declared in elf64-s390.c. */
678 struct elf_s390_obj_tdata
679 {
680 struct elf_obj_tdata root;
681
682 /* A local PLT is needed for ifunc symbols. */
683 struct plt_entry *local_plt;
684
685 /* TLS type for each local got entry. */
686 char *local_got_tls_type;
687 };
688
689 #define elf_s390_tdata(abfd) \
690 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
691
692 #define elf_s390_local_plt(abfd) \
693 (elf_s390_tdata (abfd)->local_plt)
694
695 #define elf_s390_local_got_tls_type(abfd) \
696 (elf_s390_tdata (abfd)->local_got_tls_type)
697
698 #define is_s390_elf(bfd) \
699 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
700 && elf_tdata (bfd) != NULL \
701 && elf_object_id (bfd) == S390_ELF_DATA)
702
703 static bfd_boolean
704 elf_s390_mkobject (bfd *abfd)
705 {
706 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
707 S390_ELF_DATA);
708 }
709
710 static bfd_boolean
711 elf_s390_object_p (bfd *abfd)
712 {
713 /* Set the right machine number for an s390 elf32 file. */
714 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
715 }
716
717 /* s390 ELF linker hash table. */
718
719 struct elf_s390_link_hash_table
720 {
721 struct elf_link_hash_table elf;
722
723 /* Short-cuts to get to dynamic linker sections. */
724 asection *sdynbss;
725 asection *srelbss;
726 asection *irelifunc;
727
728 union
729 {
730 bfd_signed_vma refcount;
731 bfd_vma offset;
732 } tls_ldm_got;
733
734 /* Small local sym cache. */
735 struct sym_cache sym_cache;
736 };
737
738 /* Get the s390 ELF linker hash table from a link_info structure. */
739
740 #define elf_s390_hash_table(p) \
741 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
742 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
743
744 #undef ELF64
745 #include "elf-s390-common.c"
746
747 /* Create an entry in an s390 ELF linker hash table. */
748
749 static struct bfd_hash_entry *
750 link_hash_newfunc (struct bfd_hash_entry *entry,
751 struct bfd_hash_table *table,
752 const char *string)
753 {
754 /* Allocate the structure if it has not already been allocated by a
755 subclass. */
756 if (entry == NULL)
757 {
758 entry = bfd_hash_allocate (table,
759 sizeof (struct elf_s390_link_hash_entry));
760 if (entry == NULL)
761 return entry;
762 }
763
764 /* Call the allocation method of the superclass. */
765 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
766 if (entry != NULL)
767 {
768 struct elf_s390_link_hash_entry *eh;
769
770 eh = (struct elf_s390_link_hash_entry *) entry;
771 eh->dyn_relocs = NULL;
772 eh->gotplt_refcount = 0;
773 eh->tls_type = GOT_UNKNOWN;
774 eh->ifunc_resolver_address = 0;
775 eh->ifunc_resolver_section = NULL;
776 }
777
778 return entry;
779 }
780
781 /* Create an s390 ELF linker hash table. */
782
783 static struct bfd_link_hash_table *
784 elf_s390_link_hash_table_create (bfd *abfd)
785 {
786 struct elf_s390_link_hash_table *ret;
787 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
788
789 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
790 if (ret == NULL)
791 return NULL;
792
793 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
794 sizeof (struct elf_s390_link_hash_entry),
795 S390_ELF_DATA))
796 {
797 free (ret);
798 return NULL;
799 }
800
801 ret->elf.sgot = NULL;
802 ret->elf.sgotplt = NULL;
803 ret->elf.srelgot = NULL;
804 ret->elf.splt = NULL;
805 ret->elf.srelplt = NULL;
806 ret->sdynbss = NULL;
807 ret->srelbss = NULL;
808 ret->tls_ldm_got.refcount = 0;
809 ret->sym_cache.abfd = NULL;
810
811 return &ret->elf.root;
812 }
813
814 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
815 shortcuts to them in our hash table. */
816
817 static bfd_boolean
818 create_got_section (bfd *dynobj, struct bfd_link_info *info)
819 {
820 struct elf_s390_link_hash_table *htab;
821
822 if (! _bfd_elf_create_got_section (dynobj, info))
823 return FALSE;
824
825 htab = elf_s390_hash_table (info);
826 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
827 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
828 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
829 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
830 abort ();
831
832 return TRUE;
833 }
834
835 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
836 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
837 hash table. */
838
839 static bfd_boolean
840 elf_s390_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
841 {
842 struct elf_s390_link_hash_table *htab;
843
844 htab = elf_s390_hash_table (info);
845 if (!htab->elf.sgot && !create_got_section (dynobj, info))
846 return FALSE;
847
848 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
849 return FALSE;
850
851 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
852 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
853 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
854 if (!info->shared)
855 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
856
857 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
858 || (!info->shared && !htab->srelbss))
859 abort ();
860
861 return TRUE;
862 }
863
864 /* Copy the extra info we tack onto an elf_link_hash_entry. */
865
866 static void
867 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
868 struct elf_link_hash_entry *dir,
869 struct elf_link_hash_entry *ind)
870 {
871 struct elf_s390_link_hash_entry *edir, *eind;
872
873 edir = (struct elf_s390_link_hash_entry *) dir;
874 eind = (struct elf_s390_link_hash_entry *) ind;
875
876 if (eind->dyn_relocs != NULL)
877 {
878 if (edir->dyn_relocs != NULL)
879 {
880 struct elf_dyn_relocs **pp;
881 struct elf_dyn_relocs *p;
882
883 /* Add reloc counts against the indirect sym to the direct sym
884 list. Merge any entries against the same section. */
885 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
886 {
887 struct elf_dyn_relocs *q;
888
889 for (q = edir->dyn_relocs; q != NULL; q = q->next)
890 if (q->sec == p->sec)
891 {
892 q->pc_count += p->pc_count;
893 q->count += p->count;
894 *pp = p->next;
895 break;
896 }
897 if (q == NULL)
898 pp = &p->next;
899 }
900 *pp = edir->dyn_relocs;
901 }
902
903 edir->dyn_relocs = eind->dyn_relocs;
904 eind->dyn_relocs = NULL;
905 }
906
907 if (ind->root.type == bfd_link_hash_indirect
908 && dir->got.refcount <= 0)
909 {
910 edir->tls_type = eind->tls_type;
911 eind->tls_type = GOT_UNKNOWN;
912 }
913
914 if (ELIMINATE_COPY_RELOCS
915 && ind->root.type != bfd_link_hash_indirect
916 && dir->dynamic_adjusted)
917 {
918 /* If called to transfer flags for a weakdef during processing
919 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
920 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
921 dir->ref_dynamic |= ind->ref_dynamic;
922 dir->ref_regular |= ind->ref_regular;
923 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
924 dir->needs_plt |= ind->needs_plt;
925 }
926 else
927 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
928 }
929
930 static int
931 elf_s390_tls_transition (struct bfd_link_info *info,
932 int r_type,
933 int is_local)
934 {
935 if (info->shared)
936 return r_type;
937
938 switch (r_type)
939 {
940 case R_390_TLS_GD32:
941 case R_390_TLS_IE32:
942 if (is_local)
943 return R_390_TLS_LE32;
944 return R_390_TLS_IE32;
945 case R_390_TLS_GOTIE32:
946 if (is_local)
947 return R_390_TLS_LE32;
948 return R_390_TLS_GOTIE32;
949 case R_390_TLS_LDM32:
950 return R_390_TLS_LE32;
951 }
952
953 return r_type;
954 }
955
956 /* Look through the relocs for a section during the first phase, and
957 allocate space in the global offset table or procedure linkage
958 table. */
959
960 static bfd_boolean
961 elf_s390_check_relocs (bfd *abfd,
962 struct bfd_link_info *info,
963 asection *sec,
964 const Elf_Internal_Rela *relocs)
965 {
966 struct elf_s390_link_hash_table *htab;
967 Elf_Internal_Shdr *symtab_hdr;
968 struct elf_link_hash_entry **sym_hashes;
969 const Elf_Internal_Rela *rel;
970 const Elf_Internal_Rela *rel_end;
971 asection *sreloc;
972 bfd_signed_vma *local_got_refcounts;
973 int tls_type, old_tls_type;
974 Elf_Internal_Sym *isym;
975
976 if (info->relocatable)
977 return TRUE;
978
979 BFD_ASSERT (is_s390_elf (abfd));
980
981 htab = elf_s390_hash_table (info);
982 symtab_hdr = &elf_symtab_hdr (abfd);
983 sym_hashes = elf_sym_hashes (abfd);
984 local_got_refcounts = elf_local_got_refcounts (abfd);
985
986 sreloc = NULL;
987
988 rel_end = relocs + sec->reloc_count;
989 for (rel = relocs; rel < rel_end; rel++)
990 {
991 unsigned int r_type;
992 unsigned long r_symndx;
993 struct elf_link_hash_entry *h;
994
995 r_symndx = ELF32_R_SYM (rel->r_info);
996
997 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
998 {
999 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1000 abfd, r_symndx);
1001 return FALSE;
1002 }
1003
1004 if (r_symndx < symtab_hdr->sh_info)
1005 {
1006 /* A local symbol. */
1007 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1008 abfd, r_symndx);
1009 if (isym == NULL)
1010 return FALSE;
1011
1012 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1013 {
1014 struct plt_entry *plt;
1015
1016 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1017 return FALSE;
1018
1019 if (local_got_refcounts == NULL)
1020 {
1021 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1022 return FALSE;
1023 local_got_refcounts = elf_local_got_refcounts (abfd);
1024 }
1025 plt = elf_s390_local_plt (abfd);
1026 plt[r_symndx].plt.refcount++;
1027 }
1028 h = NULL;
1029 }
1030 else
1031 {
1032 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1033 while (h->root.type == bfd_link_hash_indirect
1034 || h->root.type == bfd_link_hash_warning)
1035 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1036 }
1037
1038 /* Create got section and local_got_refcounts array if they
1039 are needed. */
1040 r_type = elf_s390_tls_transition (info,
1041 ELF32_R_TYPE (rel->r_info),
1042 h == NULL);
1043 switch (r_type)
1044 {
1045 case R_390_GOT12:
1046 case R_390_GOT16:
1047 case R_390_GOT20:
1048 case R_390_GOT32:
1049 case R_390_GOTENT:
1050 case R_390_GOTPLT12:
1051 case R_390_GOTPLT16:
1052 case R_390_GOTPLT20:
1053 case R_390_GOTPLT32:
1054 case R_390_GOTPLTENT:
1055 case R_390_TLS_GD32:
1056 case R_390_TLS_GOTIE12:
1057 case R_390_TLS_GOTIE20:
1058 case R_390_TLS_GOTIE32:
1059 case R_390_TLS_IEENT:
1060 case R_390_TLS_IE32:
1061 case R_390_TLS_LDM32:
1062 if (h == NULL
1063 && local_got_refcounts == NULL)
1064 {
1065 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1066 return FALSE;
1067 local_got_refcounts = elf_local_got_refcounts (abfd);
1068 }
1069 /* Fall through. */
1070 case R_390_GOTOFF16:
1071 case R_390_GOTOFF32:
1072 case R_390_GOTPC:
1073 case R_390_GOTPCDBL:
1074 if (htab->elf.sgot == NULL)
1075 {
1076 if (htab->elf.dynobj == NULL)
1077 htab->elf.dynobj = abfd;
1078 if (!create_got_section (htab->elf.dynobj, info))
1079 return FALSE;
1080 }
1081 }
1082
1083 if (h != NULL)
1084 {
1085 if (htab->elf.dynobj == NULL)
1086 htab->elf.dynobj = abfd;
1087 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1088 return FALSE;
1089
1090 /* Make sure an IFUNC symbol defined in a non-shared object
1091 always gets a PLT slot. */
1092 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1093 {
1094 /* The symbol is called by the dynamic loader in order
1095 to resolve the relocation. So it is in fact also
1096 referenced. */
1097 h->ref_regular = 1;
1098 h->needs_plt = 1;
1099 }
1100 }
1101 switch (r_type)
1102 {
1103 case R_390_GOTOFF16:
1104 case R_390_GOTOFF32:
1105 case R_390_GOTPC:
1106 case R_390_GOTPCDBL:
1107 /* These relocs do not need a GOT slot. They just load the
1108 GOT pointer itself or address something else relative to
1109 the GOT. Since the GOT pointer has been set up above we
1110 are done. */
1111 break;
1112
1113 case R_390_PLT16DBL:
1114 case R_390_PLT32DBL:
1115 case R_390_PLT32:
1116 case R_390_PLTOFF16:
1117 case R_390_PLTOFF32:
1118 /* This symbol requires a procedure linkage table entry. We
1119 actually build the entry in adjust_dynamic_symbol,
1120 because this might be a case of linking PIC code which is
1121 never referenced by a dynamic object, in which case we
1122 don't need to generate a procedure linkage table entry
1123 after all. */
1124
1125 /* If this is a local symbol, we resolve it directly without
1126 creating a procedure linkage table entry. */
1127 if (h != NULL)
1128 {
1129 h->needs_plt = 1;
1130 h->plt.refcount += 1;
1131 }
1132 break;
1133
1134 case R_390_GOTPLT12:
1135 case R_390_GOTPLT16:
1136 case R_390_GOTPLT20:
1137 case R_390_GOTPLT32:
1138 case R_390_GOTPLTENT:
1139 /* This symbol requires either a procedure linkage table entry
1140 or an entry in the local got. We actually build the entry
1141 in adjust_dynamic_symbol because whether this is really a
1142 global reference can change and with it the fact if we have
1143 to create a plt entry or a local got entry. To be able to
1144 make a once global symbol a local one we have to keep track
1145 of the number of gotplt references that exist for this
1146 symbol. */
1147 if (h != NULL)
1148 {
1149 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1150 h->needs_plt = 1;
1151 h->plt.refcount += 1;
1152 }
1153 else
1154 local_got_refcounts[r_symndx] += 1;
1155 break;
1156
1157 case R_390_TLS_LDM32:
1158 htab->tls_ldm_got.refcount += 1;
1159 break;
1160
1161 case R_390_TLS_IE32:
1162 case R_390_TLS_GOTIE12:
1163 case R_390_TLS_GOTIE20:
1164 case R_390_TLS_GOTIE32:
1165 case R_390_TLS_IEENT:
1166 if (info->shared)
1167 info->flags |= DF_STATIC_TLS;
1168 /* Fall through. */
1169
1170 case R_390_GOT12:
1171 case R_390_GOT16:
1172 case R_390_GOT20:
1173 case R_390_GOT32:
1174 case R_390_GOTENT:
1175 case R_390_TLS_GD32:
1176 /* This symbol requires a global offset table entry. */
1177 switch (r_type)
1178 {
1179 default:
1180 case R_390_GOT12:
1181 case R_390_GOT16:
1182 case R_390_GOT20:
1183 case R_390_GOT32:
1184 case R_390_GOTENT:
1185 tls_type = GOT_NORMAL;
1186 break;
1187 case R_390_TLS_GD32:
1188 tls_type = GOT_TLS_GD;
1189 break;
1190 case R_390_TLS_IE32:
1191 case R_390_TLS_GOTIE32:
1192 tls_type = GOT_TLS_IE;
1193 break;
1194 case R_390_TLS_GOTIE12:
1195 case R_390_TLS_GOTIE20:
1196 case R_390_TLS_IEENT:
1197 tls_type = GOT_TLS_IE_NLT;
1198 break;
1199 }
1200
1201 if (h != NULL)
1202 {
1203 h->got.refcount += 1;
1204 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1205 }
1206 else
1207 {
1208 local_got_refcounts[r_symndx] += 1;
1209 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1210 }
1211 /* If a TLS symbol is accessed using IE at least once,
1212 there is no point to use dynamic model for it. */
1213 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1214 {
1215 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1216 {
1217 (*_bfd_error_handler)
1218 (_("%B: `%s' accessed both as normal and thread local symbol"),
1219 abfd, h->root.root.string);
1220 return FALSE;
1221 }
1222 if (old_tls_type > tls_type)
1223 tls_type = old_tls_type;
1224 }
1225
1226 if (old_tls_type != tls_type)
1227 {
1228 if (h != NULL)
1229 elf_s390_hash_entry (h)->tls_type = tls_type;
1230 else
1231 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1232 }
1233
1234 if (r_type != R_390_TLS_IE32)
1235 break;
1236 /* Fall through. */
1237
1238 case R_390_TLS_LE32:
1239 if (!info->shared)
1240 break;
1241 info->flags |= DF_STATIC_TLS;
1242 /* Fall through. */
1243
1244 case R_390_8:
1245 case R_390_16:
1246 case R_390_32:
1247 case R_390_PC16:
1248 case R_390_PC16DBL:
1249 case R_390_PC32DBL:
1250 case R_390_PC32:
1251 if (h != NULL)
1252 {
1253 /* If this reloc is in a read-only section, we might
1254 need a copy reloc. We can't check reliably at this
1255 stage whether the section is read-only, as input
1256 sections have not yet been mapped to output sections.
1257 Tentatively set the flag for now, and correct in
1258 adjust_dynamic_symbol. */
1259 h->non_got_ref = 1;
1260
1261 if (!info->shared)
1262 {
1263 /* We may need a .plt entry if the function this reloc
1264 refers to is in a shared lib. */
1265 h->plt.refcount += 1;
1266 }
1267 }
1268
1269 /* If we are creating a shared library, and this is a reloc
1270 against a global symbol, or a non PC relative reloc
1271 against a local symbol, then we need to copy the reloc
1272 into the shared library. However, if we are linking with
1273 -Bsymbolic, we do not need to copy a reloc against a
1274 global symbol which is defined in an object we are
1275 including in the link (i.e., DEF_REGULAR is set). At
1276 this point we have not seen all the input files, so it is
1277 possible that DEF_REGULAR is not set now but will be set
1278 later (it is never cleared). In case of a weak definition,
1279 DEF_REGULAR may be cleared later by a strong definition in
1280 a shared library. We account for that possibility below by
1281 storing information in the relocs_copied field of the hash
1282 table entry. A similar situation occurs when creating
1283 shared libraries and symbol visibility changes render the
1284 symbol local.
1285
1286 If on the other hand, we are creating an executable, we
1287 may need to keep relocations for symbols satisfied by a
1288 dynamic library if we manage to avoid copy relocs for the
1289 symbol. */
1290 if ((info->shared
1291 && (sec->flags & SEC_ALLOC) != 0
1292 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1293 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1294 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1295 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1296 || (h != NULL
1297 && (! SYMBOLIC_BIND (info, h)
1298 || h->root.type == bfd_link_hash_defweak
1299 || !h->def_regular))))
1300 || (ELIMINATE_COPY_RELOCS
1301 && !info->shared
1302 && (sec->flags & SEC_ALLOC) != 0
1303 && h != NULL
1304 && (h->root.type == bfd_link_hash_defweak
1305 || !h->def_regular)))
1306 {
1307 struct elf_dyn_relocs *p;
1308 struct elf_dyn_relocs **head;
1309
1310 /* We must copy these reloc types into the output file.
1311 Create a reloc section in dynobj and make room for
1312 this reloc. */
1313 if (sreloc == NULL)
1314 {
1315 if (htab->elf.dynobj == NULL)
1316 htab->elf.dynobj = abfd;
1317
1318 sreloc = _bfd_elf_make_dynamic_reloc_section
1319 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1320
1321 if (sreloc == NULL)
1322 return FALSE;
1323 }
1324
1325 /* If this is a global symbol, we count the number of
1326 relocations we need for this symbol. */
1327 if (h != NULL)
1328 {
1329 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1330 }
1331 else
1332 {
1333 /* Track dynamic relocs needed for local syms too.
1334 We really need local syms available to do this
1335 easily. Oh well. */
1336 asection *s;
1337 void *vpp;
1338
1339 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1340 abfd, r_symndx);
1341 if (isym == NULL)
1342 return FALSE;
1343
1344 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1345 if (s == NULL)
1346 s = sec;
1347
1348 vpp = &elf_section_data (s)->local_dynrel;
1349 head = (struct elf_dyn_relocs **) vpp;
1350 }
1351
1352 p = *head;
1353 if (p == NULL || p->sec != sec)
1354 {
1355 bfd_size_type amt = sizeof *p;
1356
1357 p = ((struct elf_dyn_relocs *)
1358 bfd_alloc (htab->elf.dynobj, amt));
1359 if (p == NULL)
1360 return FALSE;
1361 p->next = *head;
1362 *head = p;
1363 p->sec = sec;
1364 p->count = 0;
1365 p->pc_count = 0;
1366 }
1367
1368 p->count += 1;
1369 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1370 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1371 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1372 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1373 p->pc_count += 1;
1374 }
1375 break;
1376
1377 /* This relocation describes the C++ object vtable hierarchy.
1378 Reconstruct it for later use during GC. */
1379 case R_390_GNU_VTINHERIT:
1380 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1381 return FALSE;
1382 break;
1383
1384 /* This relocation describes which C++ vtable entries are actually
1385 used. Record for later use during GC. */
1386 case R_390_GNU_VTENTRY:
1387 BFD_ASSERT (h != NULL);
1388 if (h != NULL
1389 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1390 return FALSE;
1391 break;
1392
1393 default:
1394 break;
1395 }
1396 }
1397
1398 return TRUE;
1399 }
1400
1401 /* Return the section that should be marked against GC for a given
1402 relocation. */
1403
1404 static asection *
1405 elf_s390_gc_mark_hook (asection *sec,
1406 struct bfd_link_info *info,
1407 Elf_Internal_Rela *rel,
1408 struct elf_link_hash_entry *h,
1409 Elf_Internal_Sym *sym)
1410 {
1411 if (h != NULL)
1412 switch (ELF32_R_TYPE (rel->r_info))
1413 {
1414 case R_390_GNU_VTINHERIT:
1415 case R_390_GNU_VTENTRY:
1416 return NULL;
1417 }
1418 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1419
1420 }
1421
1422 /* Update the got entry reference counts for the section being removed. */
1423
1424 static bfd_boolean
1425 elf_s390_gc_sweep_hook (bfd *abfd,
1426 struct bfd_link_info *info,
1427 asection *sec,
1428 const Elf_Internal_Rela *relocs)
1429 {
1430 struct elf_s390_link_hash_table *htab;
1431 Elf_Internal_Shdr *symtab_hdr;
1432 struct elf_link_hash_entry **sym_hashes;
1433 bfd_signed_vma *local_got_refcounts;
1434 const Elf_Internal_Rela *rel, *relend;
1435
1436 if (info->relocatable)
1437 return TRUE;
1438
1439 htab = elf_s390_hash_table (info);
1440 if (htab == NULL)
1441 return FALSE;
1442
1443 elf_section_data (sec)->local_dynrel = NULL;
1444
1445 symtab_hdr = &elf_symtab_hdr (abfd);
1446 sym_hashes = elf_sym_hashes (abfd);
1447 local_got_refcounts = elf_local_got_refcounts (abfd);
1448
1449 relend = relocs + sec->reloc_count;
1450 for (rel = relocs; rel < relend; rel++)
1451 {
1452 unsigned long r_symndx;
1453 unsigned int r_type;
1454 struct elf_link_hash_entry *h = NULL;
1455
1456 r_symndx = ELF32_R_SYM (rel->r_info);
1457 if (r_symndx >= symtab_hdr->sh_info)
1458 {
1459 struct elf_s390_link_hash_entry *eh;
1460 struct elf_dyn_relocs **pp;
1461 struct elf_dyn_relocs *p;
1462
1463 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1464 while (h->root.type == bfd_link_hash_indirect
1465 || h->root.type == bfd_link_hash_warning)
1466 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1467 eh = (struct elf_s390_link_hash_entry *) h;
1468
1469 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1470 if (p->sec == sec)
1471 {
1472 /* Everything must go for SEC. */
1473 *pp = p->next;
1474 break;
1475 }
1476 }
1477 else
1478 {
1479 Elf_Internal_Sym *isym;
1480
1481 /* A local symbol. */
1482 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1483 abfd, r_symndx);
1484 if (isym == NULL)
1485 return FALSE;
1486
1487 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1488 {
1489 struct plt_entry *plt = elf_s390_local_plt (abfd);
1490 if (plt[r_symndx].plt.refcount > 0)
1491 plt[r_symndx].plt.refcount--;
1492 }
1493 }
1494
1495 r_type = ELF32_R_TYPE (rel->r_info);
1496 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1497 switch (r_type)
1498 {
1499 case R_390_TLS_LDM32:
1500 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1501 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1502 break;
1503
1504 case R_390_TLS_GD32:
1505 case R_390_TLS_IE32:
1506 case R_390_TLS_GOTIE12:
1507 case R_390_TLS_GOTIE20:
1508 case R_390_TLS_GOTIE32:
1509 case R_390_TLS_IEENT:
1510 case R_390_GOT12:
1511 case R_390_GOT16:
1512 case R_390_GOT20:
1513 case R_390_GOT32:
1514 case R_390_GOTOFF16:
1515 case R_390_GOTOFF32:
1516 case R_390_GOTPC:
1517 case R_390_GOTPCDBL:
1518 case R_390_GOTENT:
1519 if (h != NULL)
1520 {
1521 if (h->got.refcount > 0)
1522 h->got.refcount -= 1;
1523 }
1524 else if (local_got_refcounts != NULL)
1525 {
1526 if (local_got_refcounts[r_symndx] > 0)
1527 local_got_refcounts[r_symndx] -= 1;
1528 }
1529 break;
1530
1531 case R_390_8:
1532 case R_390_12:
1533 case R_390_16:
1534 case R_390_20:
1535 case R_390_32:
1536 case R_390_PC16:
1537 case R_390_PC16DBL:
1538 case R_390_PC32DBL:
1539 case R_390_PC32:
1540 if (info->shared)
1541 break;
1542 /* Fall through. */
1543
1544 case R_390_PLT16DBL:
1545 case R_390_PLT32DBL:
1546 case R_390_PLT32:
1547 case R_390_PLTOFF16:
1548 case R_390_PLTOFF32:
1549 if (h != NULL)
1550 {
1551 if (h->plt.refcount > 0)
1552 h->plt.refcount -= 1;
1553 }
1554 break;
1555
1556 case R_390_GOTPLT12:
1557 case R_390_GOTPLT16:
1558 case R_390_GOTPLT20:
1559 case R_390_GOTPLT32:
1560 case R_390_GOTPLTENT:
1561 if (h != NULL)
1562 {
1563 if (h->plt.refcount > 0)
1564 {
1565 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1566 h->plt.refcount -= 1;
1567 }
1568 }
1569 else if (local_got_refcounts != NULL)
1570 {
1571 if (local_got_refcounts[r_symndx] > 0)
1572 local_got_refcounts[r_symndx] -= 1;
1573 }
1574 break;
1575
1576 default:
1577 break;
1578 }
1579 }
1580
1581 return TRUE;
1582 }
1583
1584 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1585 entry but we found we will not create any. Called when we find we will
1586 not have any PLT for this symbol, by for example
1587 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1588 or elf_s390_size_dynamic_sections if no dynamic sections will be
1589 created (we're only linking static objects). */
1590
1591 static void
1592 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1593 {
1594 if (h->elf.root.type == bfd_link_hash_warning)
1595 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1596
1597 if (h->gotplt_refcount <= 0)
1598 return;
1599
1600 /* We simply add the number of gotplt references to the number
1601 * of got references for this symbol. */
1602 h->elf.got.refcount += h->gotplt_refcount;
1603 h->gotplt_refcount = -1;
1604 }
1605
1606 /* Adjust a symbol defined by a dynamic object and referenced by a
1607 regular object. The current definition is in some section of the
1608 dynamic object, but we're not including those sections. We have to
1609 change the definition to something the rest of the link can
1610 understand. */
1611
1612 static bfd_boolean
1613 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1614 struct elf_link_hash_entry *h)
1615 {
1616 struct elf_s390_link_hash_table *htab;
1617 asection *s;
1618
1619 /* STT_GNU_IFUNC symbol must go through PLT. */
1620 if (s390_is_ifunc_symbol_p (h))
1621 return TRUE;
1622
1623 /* If this is a function, put it in the procedure linkage table. We
1624 will fill in the contents of the procedure linkage table later
1625 (although we could actually do it here). */
1626 if (h->type == STT_FUNC
1627 || h->needs_plt)
1628 {
1629 if (h->plt.refcount <= 0
1630 || SYMBOL_CALLS_LOCAL (info, h)
1631 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1632 && h->root.type != bfd_link_hash_undefweak))
1633 {
1634 /* This case can occur if we saw a PLT32 reloc in an input
1635 file, but the symbol was never referred to by a dynamic
1636 object, or if all references were garbage collected. In
1637 such a case, we don't actually need to build a procedure
1638 linkage table, and we can just do a PC32 reloc instead. */
1639 h->plt.offset = (bfd_vma) -1;
1640 h->needs_plt = 0;
1641 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1642 }
1643
1644 return TRUE;
1645 }
1646 else
1647 /* It's possible that we incorrectly decided a .plt reloc was
1648 needed for an R_390_PC32 reloc to a non-function sym in
1649 check_relocs. We can't decide accurately between function and
1650 non-function syms in check-relocs; Objects loaded later in
1651 the link may change h->type. So fix it now. */
1652 h->plt.offset = (bfd_vma) -1;
1653
1654 /* If this is a weak symbol, and there is a real definition, the
1655 processor independent code will have arranged for us to see the
1656 real definition first, and we can just use the same value. */
1657 if (h->u.weakdef != NULL)
1658 {
1659 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1660 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1661 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1662 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1663 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1664 h->non_got_ref = h->u.weakdef->non_got_ref;
1665 return TRUE;
1666 }
1667
1668 /* This is a reference to a symbol defined by a dynamic object which
1669 is not a function. */
1670
1671 /* If we are creating a shared library, we must presume that the
1672 only references to the symbol are via the global offset table.
1673 For such cases we need not do anything here; the relocations will
1674 be handled correctly by relocate_section. */
1675 if (info->shared)
1676 return TRUE;
1677
1678 /* If there are no references to this symbol that do not use the
1679 GOT, we don't need to generate a copy reloc. */
1680 if (!h->non_got_ref)
1681 return TRUE;
1682
1683 /* If -z nocopyreloc was given, we won't generate them either. */
1684 if (info->nocopyreloc)
1685 {
1686 h->non_got_ref = 0;
1687 return TRUE;
1688 }
1689
1690 if (ELIMINATE_COPY_RELOCS)
1691 {
1692 struct elf_s390_link_hash_entry * eh;
1693 struct elf_dyn_relocs *p;
1694
1695 eh = (struct elf_s390_link_hash_entry *) h;
1696 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1697 {
1698 s = p->sec->output_section;
1699 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1700 break;
1701 }
1702
1703 /* If we didn't find any dynamic relocs in read-only sections, then
1704 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1705 if (p == NULL)
1706 {
1707 h->non_got_ref = 0;
1708 return TRUE;
1709 }
1710 }
1711
1712 /* We must allocate the symbol in our .dynbss section, which will
1713 become part of the .bss section of the executable. There will be
1714 an entry for this symbol in the .dynsym section. The dynamic
1715 object will contain position independent code, so all references
1716 from the dynamic object to this symbol will go through the global
1717 offset table. The dynamic linker will use the .dynsym entry to
1718 determine the address it must put in the global offset table, so
1719 both the dynamic object and the regular object will refer to the
1720 same memory location for the variable. */
1721
1722 htab = elf_s390_hash_table (info);
1723
1724 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1725 copy the initial value out of the dynamic object and into the
1726 runtime process image. */
1727 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1728 {
1729 htab->srelbss->size += sizeof (Elf32_External_Rela);
1730 h->needs_copy = 1;
1731 }
1732
1733 s = htab->sdynbss;
1734
1735 return _bfd_elf_adjust_dynamic_copy (h, s);
1736 }
1737
1738 /* Allocate space in .plt, .got and associated reloc sections for
1739 dynamic relocs. */
1740
1741 static bfd_boolean
1742 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1743 {
1744 struct bfd_link_info *info;
1745 struct elf_s390_link_hash_table *htab;
1746 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1747 struct elf_dyn_relocs *p;
1748
1749 if (h->root.type == bfd_link_hash_indirect)
1750 return TRUE;
1751
1752 info = (struct bfd_link_info *) inf;
1753 htab = elf_s390_hash_table (info);
1754
1755 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1756 here if it is defined and referenced in a non-shared object. */
1757 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1758 return s390_elf_allocate_ifunc_dyn_relocs (info, h,
1759 &eh->dyn_relocs);
1760 else if (htab->elf.dynamic_sections_created
1761 && h->plt.refcount > 0)
1762 {
1763 /* Make sure this symbol is output as a dynamic symbol.
1764 Undefined weak syms won't yet be marked as dynamic. */
1765 if (h->dynindx == -1
1766 && !h->forced_local)
1767 {
1768 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1769 return FALSE;
1770 }
1771
1772 if (info->shared
1773 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1774 {
1775 asection *s = htab->elf.splt;
1776
1777 /* If this is the first .plt entry, make room for the special
1778 first entry. */
1779 if (s->size == 0)
1780 s->size += PLT_FIRST_ENTRY_SIZE;
1781
1782 h->plt.offset = s->size;
1783
1784 /* If this symbol is not defined in a regular file, and we are
1785 not generating a shared library, then set the symbol to this
1786 location in the .plt. This is required to make function
1787 pointers compare as equal between the normal executable and
1788 the shared library. */
1789 if (! info->shared
1790 && !h->def_regular)
1791 {
1792 h->root.u.def.section = s;
1793 h->root.u.def.value = h->plt.offset;
1794 }
1795
1796 /* Make room for this entry. */
1797 s->size += PLT_ENTRY_SIZE;
1798
1799 /* We also need to make an entry in the .got.plt section, which
1800 will be placed in the .got section by the linker script. */
1801 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1802
1803 /* We also need to make an entry in the .rela.plt section. */
1804 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1805 }
1806 else
1807 {
1808 h->plt.offset = (bfd_vma) -1;
1809 h->needs_plt = 0;
1810 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1811 }
1812 }
1813 else
1814 {
1815 h->plt.offset = (bfd_vma) -1;
1816 h->needs_plt = 0;
1817 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1818 }
1819
1820 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1821 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1822 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1823 we can save the dynamic TLS relocation. */
1824 if (h->got.refcount > 0
1825 && !info->shared
1826 && h->dynindx == -1
1827 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1828 {
1829 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1830 /* For the GOTIE access without a literal pool entry the offset has
1831 to be stored somewhere. The immediate value in the instruction
1832 is not bit enough so the value is stored in the got. */
1833 {
1834 h->got.offset = htab->elf.sgot->size;
1835 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1836 }
1837 else
1838 h->got.offset = (bfd_vma) -1;
1839 }
1840 else if (h->got.refcount > 0)
1841 {
1842 asection *s;
1843 bfd_boolean dyn;
1844 int tls_type = elf_s390_hash_entry(h)->tls_type;
1845
1846 /* Make sure this symbol is output as a dynamic symbol.
1847 Undefined weak syms won't yet be marked as dynamic. */
1848 if (h->dynindx == -1
1849 && !h->forced_local)
1850 {
1851 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1852 return FALSE;
1853 }
1854
1855 s = htab->elf.sgot;
1856 h->got.offset = s->size;
1857 s->size += GOT_ENTRY_SIZE;
1858 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1859 if (tls_type == GOT_TLS_GD)
1860 s->size += GOT_ENTRY_SIZE;
1861 dyn = htab->elf.dynamic_sections_created;
1862 /* R_390_TLS_IE32 needs one dynamic relocation,
1863 R_390_TLS_GD32 needs one if local symbol and two if global. */
1864 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1865 || tls_type >= GOT_TLS_IE)
1866 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1867 else if (tls_type == GOT_TLS_GD)
1868 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1869 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1870 || h->root.type != bfd_link_hash_undefweak)
1871 && (info->shared
1872 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1873 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1874 }
1875 else
1876 h->got.offset = (bfd_vma) -1;
1877
1878 if (eh->dyn_relocs == NULL)
1879 return TRUE;
1880
1881 /* In the shared -Bsymbolic case, discard space allocated for
1882 dynamic pc-relative relocs against symbols which turn out to be
1883 defined in regular objects. For the normal shared case, discard
1884 space for pc-relative relocs that have become local due to symbol
1885 visibility changes. */
1886
1887 if (info->shared)
1888 {
1889 if (SYMBOL_CALLS_LOCAL (info, h))
1890 {
1891 struct elf_dyn_relocs **pp;
1892
1893 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1894 {
1895 p->count -= p->pc_count;
1896 p->pc_count = 0;
1897 if (p->count == 0)
1898 *pp = p->next;
1899 else
1900 pp = &p->next;
1901 }
1902 }
1903
1904 /* Also discard relocs on undefined weak syms with non-default
1905 visibility. */
1906 if (eh->dyn_relocs != NULL
1907 && h->root.type == bfd_link_hash_undefweak)
1908 {
1909 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1910 eh->dyn_relocs = NULL;
1911
1912 /* Make sure undefined weak symbols are output as a dynamic
1913 symbol in PIEs. */
1914 else if (h->dynindx == -1
1915 && !h->forced_local)
1916 {
1917 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1918 return FALSE;
1919 }
1920 }
1921 }
1922 else if (ELIMINATE_COPY_RELOCS)
1923 {
1924 /* For the non-shared case, discard space for relocs against
1925 symbols which turn out to need copy relocs or are not
1926 dynamic. */
1927
1928 if (!h->non_got_ref
1929 && ((h->def_dynamic
1930 && !h->def_regular)
1931 || (htab->elf.dynamic_sections_created
1932 && (h->root.type == bfd_link_hash_undefweak
1933 || h->root.type == bfd_link_hash_undefined))))
1934 {
1935 /* Make sure this symbol is output as a dynamic symbol.
1936 Undefined weak syms won't yet be marked as dynamic. */
1937 if (h->dynindx == -1
1938 && !h->forced_local)
1939 {
1940 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1941 return FALSE;
1942 }
1943
1944 /* If that succeeded, we know we'll be keeping all the
1945 relocs. */
1946 if (h->dynindx != -1)
1947 goto keep;
1948 }
1949
1950 eh->dyn_relocs = NULL;
1951
1952 keep: ;
1953 }
1954
1955 /* Finally, allocate space. */
1956 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1957 {
1958 asection *sreloc = elf_section_data (p->sec)->sreloc;
1959
1960 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1961 }
1962
1963 return TRUE;
1964 }
1965
1966 /* Find any dynamic relocs that apply to read-only sections. */
1967
1968 static bfd_boolean
1969 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1970 {
1971 struct elf_s390_link_hash_entry *eh;
1972 struct elf_dyn_relocs *p;
1973
1974 eh = (struct elf_s390_link_hash_entry *) h;
1975 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1976 {
1977 asection *s = p->sec->output_section;
1978
1979 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1980 {
1981 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1982
1983 info->flags |= DF_TEXTREL;
1984
1985 /* Not an error, just cut short the traversal. */
1986 return FALSE;
1987 }
1988 }
1989 return TRUE;
1990 }
1991
1992 /* Set the sizes of the dynamic sections. */
1993
1994 static bfd_boolean
1995 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1996 struct bfd_link_info *info)
1997 {
1998 struct elf_s390_link_hash_table *htab;
1999 bfd *dynobj;
2000 asection *s;
2001 bfd_boolean relocs;
2002 bfd *ibfd;
2003
2004 htab = elf_s390_hash_table (info);
2005 dynobj = htab->elf.dynobj;
2006 if (dynobj == NULL)
2007 abort ();
2008
2009 if (htab->elf.dynamic_sections_created)
2010 {
2011 /* Set the contents of the .interp section to the interpreter. */
2012 if (info->executable)
2013 {
2014 s = bfd_get_linker_section (dynobj, ".interp");
2015 if (s == NULL)
2016 abort ();
2017 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2018 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2019 }
2020 }
2021
2022 /* Set up .got offsets for local syms, and space for local dynamic
2023 relocs. */
2024 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2025 {
2026 bfd_signed_vma *local_got;
2027 bfd_signed_vma *end_local_got;
2028 char *local_tls_type;
2029 bfd_size_type locsymcount;
2030 Elf_Internal_Shdr *symtab_hdr;
2031 asection *srela;
2032 struct plt_entry *local_plt;
2033 unsigned int i;
2034
2035 if (! is_s390_elf (ibfd))
2036 continue;
2037
2038 for (s = ibfd->sections; s != NULL; s = s->next)
2039 {
2040 struct elf_dyn_relocs *p;
2041
2042 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2043 {
2044 if (!bfd_is_abs_section (p->sec)
2045 && bfd_is_abs_section (p->sec->output_section))
2046 {
2047 /* Input section has been discarded, either because
2048 it is a copy of a linkonce section or due to
2049 linker script /DISCARD/, so we'll be discarding
2050 the relocs too. */
2051 }
2052 else if (p->count != 0)
2053 {
2054 srela = elf_section_data (p->sec)->sreloc;
2055 srela->size += p->count * sizeof (Elf32_External_Rela);
2056 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2057 info->flags |= DF_TEXTREL;
2058 }
2059 }
2060 }
2061
2062 local_got = elf_local_got_refcounts (ibfd);
2063 if (!local_got)
2064 continue;
2065
2066 symtab_hdr = &elf_symtab_hdr (ibfd);
2067 locsymcount = symtab_hdr->sh_info;
2068 end_local_got = local_got + locsymcount;
2069 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2070 s = htab->elf.sgot;
2071 srela = htab->elf.srelgot;
2072 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2073 {
2074 if (*local_got > 0)
2075 {
2076 *local_got = s->size;
2077 s->size += GOT_ENTRY_SIZE;
2078 if (*local_tls_type == GOT_TLS_GD)
2079 s->size += GOT_ENTRY_SIZE;
2080 if (info->shared)
2081 srela->size += sizeof (Elf32_External_Rela);
2082 }
2083 else
2084 *local_got = (bfd_vma) -1;
2085 }
2086 local_plt = elf_s390_local_plt (ibfd);
2087 for (i = 0; i < symtab_hdr->sh_info; i++)
2088 {
2089 if (local_plt[i].plt.refcount > 0)
2090 {
2091 local_plt[i].plt.offset = htab->elf.iplt->size;
2092 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2093 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2094 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
2095 }
2096 else
2097 local_plt[i].plt.offset = (bfd_vma) -1;
2098 }
2099 }
2100
2101 if (htab->tls_ldm_got.refcount > 0)
2102 {
2103 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2104 relocs. */
2105 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2106 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2107 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
2108 }
2109 else
2110 htab->tls_ldm_got.offset = -1;
2111
2112 /* Allocate global sym .plt and .got entries, and space for global
2113 sym dynamic relocs. */
2114 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2115
2116 /* We now have determined the sizes of the various dynamic sections.
2117 Allocate memory for them. */
2118 relocs = FALSE;
2119 for (s = dynobj->sections; s != NULL; s = s->next)
2120 {
2121 if ((s->flags & SEC_LINKER_CREATED) == 0)
2122 continue;
2123
2124 if (s == htab->elf.splt
2125 || s == htab->elf.sgot
2126 || s == htab->elf.sgotplt
2127 || s == htab->sdynbss
2128 || s == htab->elf.iplt
2129 || s == htab->elf.igotplt
2130 || s == htab->irelifunc)
2131 {
2132 /* Strip this section if we don't need it; see the
2133 comment below. */
2134 }
2135 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2136 {
2137 if (s->size != 0)
2138 relocs = TRUE;
2139
2140 /* We use the reloc_count field as a counter if we need
2141 to copy relocs into the output file. */
2142 s->reloc_count = 0;
2143 }
2144 else
2145 {
2146 /* It's not one of our sections, so don't allocate space. */
2147 continue;
2148 }
2149
2150 if (s->size == 0)
2151 {
2152 /* If we don't need this section, strip it from the
2153 output file. This is to handle .rela.bss and
2154 .rela.plt. We must create it in
2155 create_dynamic_sections, because it must be created
2156 before the linker maps input sections to output
2157 sections. The linker does that before
2158 adjust_dynamic_symbol is called, and it is that
2159 function which decides whether anything needs to go
2160 into these sections. */
2161
2162 s->flags |= SEC_EXCLUDE;
2163 continue;
2164 }
2165
2166 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2167 continue;
2168
2169 /* Allocate memory for the section contents. We use bfd_zalloc
2170 here in case unused entries are not reclaimed before the
2171 section's contents are written out. This should not happen,
2172 but this way if it does, we get a R_390_NONE reloc instead
2173 of garbage. */
2174 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2175 if (s->contents == NULL)
2176 return FALSE;
2177 }
2178
2179 if (htab->elf.dynamic_sections_created)
2180 {
2181 /* Add some entries to the .dynamic section. We fill in the
2182 values later, in elf_s390_finish_dynamic_sections, but we
2183 must add the entries now so that we get the correct size for
2184 the .dynamic section. The DT_DEBUG entry is filled in by the
2185 dynamic linker and used by the debugger. */
2186 #define add_dynamic_entry(TAG, VAL) \
2187 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2188
2189 if (info->executable)
2190 {
2191 if (!add_dynamic_entry (DT_DEBUG, 0))
2192 return FALSE;
2193 }
2194
2195 if (htab->elf.splt->size != 0)
2196 {
2197 if (!add_dynamic_entry (DT_PLTGOT, 0)
2198 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2199 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2200 || !add_dynamic_entry (DT_JMPREL, 0))
2201 return FALSE;
2202 }
2203
2204 if (relocs)
2205 {
2206 if (!add_dynamic_entry (DT_RELA, 0)
2207 || !add_dynamic_entry (DT_RELASZ, 0)
2208 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2209 return FALSE;
2210
2211 /* If any dynamic relocs apply to a read-only section,
2212 then we need a DT_TEXTREL entry. */
2213 if ((info->flags & DF_TEXTREL) == 0)
2214 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
2215
2216 if ((info->flags & DF_TEXTREL) != 0)
2217 {
2218 if (!add_dynamic_entry (DT_TEXTREL, 0))
2219 return FALSE;
2220 }
2221 }
2222 }
2223 #undef add_dynamic_entry
2224
2225 return TRUE;
2226 }
2227
2228 /* Return the base VMA address which should be subtracted from real addresses
2229 when resolving @dtpoff relocation.
2230 This is PT_TLS segment p_vaddr. */
2231
2232 static bfd_vma
2233 dtpoff_base (struct bfd_link_info *info)
2234 {
2235 /* If tls_sec is NULL, we should have signalled an error already. */
2236 if (elf_hash_table (info)->tls_sec == NULL)
2237 return 0;
2238 return elf_hash_table (info)->tls_sec->vma;
2239 }
2240
2241 /* Return the relocation value for @tpoff relocation
2242 if STT_TLS virtual address is ADDRESS. */
2243
2244 static bfd_vma
2245 tpoff (struct bfd_link_info *info, bfd_vma address)
2246 {
2247 struct elf_link_hash_table *htab = elf_hash_table (info);
2248
2249 /* If tls_sec is NULL, we should have signalled an error already. */
2250 if (htab->tls_sec == NULL)
2251 return 0;
2252 return htab->tls_size + htab->tls_sec->vma - address;
2253 }
2254
2255 /* Complain if TLS instruction relocation is against an invalid
2256 instruction. */
2257
2258 static void
2259 invalid_tls_insn (bfd *input_bfd,
2260 asection *input_section,
2261 Elf_Internal_Rela *rel)
2262 {
2263 reloc_howto_type *howto;
2264
2265 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2266 (*_bfd_error_handler)
2267 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2268 input_bfd,
2269 input_section,
2270 (long) rel->r_offset,
2271 howto->name);
2272 bfd_set_error (bfd_error_bad_value);
2273 }
2274
2275 /* Relocate a 390 ELF section. */
2276
2277 static bfd_boolean
2278 elf_s390_relocate_section (bfd *output_bfd,
2279 struct bfd_link_info *info,
2280 bfd *input_bfd,
2281 asection *input_section,
2282 bfd_byte *contents,
2283 Elf_Internal_Rela *relocs,
2284 Elf_Internal_Sym *local_syms,
2285 asection **local_sections)
2286 {
2287 struct elf_s390_link_hash_table *htab;
2288 Elf_Internal_Shdr *symtab_hdr;
2289 struct elf_link_hash_entry **sym_hashes;
2290 bfd_vma *local_got_offsets;
2291 Elf_Internal_Rela *rel;
2292 Elf_Internal_Rela *relend;
2293
2294 BFD_ASSERT (is_s390_elf (input_bfd));
2295
2296 htab = elf_s390_hash_table (info);
2297 symtab_hdr = &elf_symtab_hdr (input_bfd);
2298 sym_hashes = elf_sym_hashes (input_bfd);
2299 local_got_offsets = elf_local_got_offsets (input_bfd);
2300
2301 rel = relocs;
2302 relend = relocs + input_section->reloc_count;
2303 for (; rel < relend; rel++)
2304 {
2305 unsigned int r_type;
2306 reloc_howto_type *howto;
2307 unsigned long r_symndx;
2308 struct elf_link_hash_entry *h;
2309 Elf_Internal_Sym *sym;
2310 asection *sec;
2311 bfd_vma off;
2312 bfd_vma relocation;
2313 bfd_boolean unresolved_reloc;
2314 bfd_reloc_status_type r;
2315 int tls_type;
2316 asection *base_got = htab->elf.sgot;
2317
2318 r_type = ELF32_R_TYPE (rel->r_info);
2319 if (r_type == (int) R_390_GNU_VTINHERIT
2320 || r_type == (int) R_390_GNU_VTENTRY)
2321 continue;
2322 if (r_type >= (int) R_390_max)
2323 {
2324 bfd_set_error (bfd_error_bad_value);
2325 return FALSE;
2326 }
2327
2328 howto = elf_howto_table + r_type;
2329 r_symndx = ELF32_R_SYM (rel->r_info);
2330
2331 h = NULL;
2332 sym = NULL;
2333 sec = NULL;
2334 unresolved_reloc = FALSE;
2335 if (r_symndx < symtab_hdr->sh_info)
2336 {
2337 sym = local_syms + r_symndx;
2338 sec = local_sections[r_symndx];
2339 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2340 {
2341 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2342 if (local_plt == NULL)
2343 return FALSE;
2344
2345 /* Address of the PLT slot. */
2346 relocation = (htab->elf.iplt->output_section->vma
2347 + htab->elf.iplt->output_offset
2348 + local_plt[r_symndx].plt.offset);
2349
2350 switch (r_type)
2351 {
2352 case R_390_PLTOFF16:
2353 case R_390_PLTOFF32:
2354 relocation -= htab->elf.sgot->output_section->vma;
2355 break;
2356 case R_390_GOTPLT12:
2357 case R_390_GOTPLT16:
2358 case R_390_GOTPLT20:
2359 case R_390_GOTPLT32:
2360 case R_390_GOTPLTENT:
2361 case R_390_GOT12:
2362 case R_390_GOT16:
2363 case R_390_GOT20:
2364 case R_390_GOT32:
2365 case R_390_GOTENT:
2366 {
2367 /* Write the PLT slot address into the GOT slot. */
2368 bfd_put_32 (output_bfd, relocation,
2369 htab->elf.sgot->contents +
2370 local_got_offsets[r_symndx]);
2371 relocation = (local_got_offsets[r_symndx] +
2372 htab->elf.sgot->output_offset);
2373
2374 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2375 relocation += htab->elf.sgot->output_section->vma;
2376 break;
2377 }
2378 default:
2379 break;
2380 }
2381 /* The output section is needed later in
2382 finish_dynamic_section when creating the dynamic
2383 relocation. */
2384 local_plt[r_symndx].sec = sec;
2385 goto do_relocation;
2386 }
2387 else
2388 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2389 }
2390 else
2391 {
2392 bfd_boolean warned ATTRIBUTE_UNUSED;
2393
2394 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2395 r_symndx, symtab_hdr, sym_hashes,
2396 h, sec, relocation,
2397 unresolved_reloc, warned);
2398 }
2399
2400 if (sec != NULL && discarded_section (sec))
2401 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2402 rel, 1, relend, howto, 0, contents);
2403
2404 if (info->relocatable)
2405 continue;
2406
2407 switch (r_type)
2408 {
2409 case R_390_GOTPLT12:
2410 case R_390_GOTPLT16:
2411 case R_390_GOTPLT20:
2412 case R_390_GOTPLT32:
2413 case R_390_GOTPLTENT:
2414 /* There are three cases for a GOTPLT relocation. 1) The
2415 relocation is against the jump slot entry of a plt that
2416 will get emitted to the output file. 2) The relocation
2417 is against the jump slot of a plt entry that has been
2418 removed. elf_s390_adjust_gotplt has created a GOT entry
2419 as replacement. 3) The relocation is against a local symbol.
2420 Cases 2) and 3) are the same as the GOT relocation code
2421 so we just have to test for case 1 and fall through for
2422 the other two. */
2423 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2424 {
2425 bfd_vma plt_index;
2426
2427 if (s390_is_ifunc_symbol_p (h))
2428 {
2429 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2430 relocation = (plt_index * GOT_ENTRY_SIZE +
2431 htab->elf.igotplt->output_offset);
2432 if (r_type == R_390_GOTPLTENT)
2433 relocation += htab->elf.igotplt->output_section->vma;
2434 }
2435 else
2436 {
2437 /* Calc. index no.
2438 Current offset - size first entry / entry size. */
2439 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2440 PLT_ENTRY_SIZE;
2441
2442 /* Offset in GOT is PLT index plus GOT headers(3)
2443 times 4, addr & GOT addr. */
2444 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2445 if (r_type == R_390_GOTPLTENT)
2446 relocation += htab->elf.sgot->output_section->vma;
2447 }
2448 unresolved_reloc = FALSE;
2449
2450 }
2451 /* Fall through. */
2452
2453 case R_390_GOT12:
2454 case R_390_GOT16:
2455 case R_390_GOT20:
2456 case R_390_GOT32:
2457 case R_390_GOTENT:
2458 /* Relocation is to the entry for this symbol in the global
2459 offset table. */
2460 if (base_got == NULL)
2461 abort ();
2462
2463 if (h != NULL)
2464 {
2465 bfd_boolean dyn;
2466
2467 off = h->got.offset;
2468 dyn = htab->elf.dynamic_sections_created;
2469
2470 if (s390_is_ifunc_symbol_p (h))
2471 {
2472 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2473 if (off == (bfd_vma)-1)
2474 {
2475 /* No explicit GOT usage so redirect to the
2476 got.iplt slot. */
2477 base_got = htab->elf.igotplt;
2478 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2479 }
2480 else
2481 {
2482 /* Explicit GOT slots must contain the address
2483 of the PLT slot. This will be handled in
2484 finish_dynamic_symbol. */
2485 }
2486 }
2487 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2488 || (info->shared
2489 && SYMBOL_REFERENCES_LOCAL (info, h))
2490 || (ELF_ST_VISIBILITY (h->other)
2491 && h->root.type == bfd_link_hash_undefweak))
2492
2493 {
2494 /* This is actually a static link, or it is a
2495 -Bsymbolic link and the symbol is defined
2496 locally, or the symbol was forced to be local
2497 because of a version file. We must initialize
2498 this entry in the global offset table. Since the
2499 offset must always be a multiple of 2, we use the
2500 least significant bit to record whether we have
2501 initialized it already.
2502
2503 When doing a dynamic link, we create a .rel.got
2504 relocation entry to initialize the value. This
2505 is done in the finish_dynamic_symbol routine. */
2506 if ((off & 1) != 0)
2507 off &= ~1;
2508 else
2509 {
2510 bfd_put_32 (output_bfd, relocation,
2511 base_got->contents + off);
2512 h->got.offset |= 1;
2513 }
2514 }
2515 else
2516 unresolved_reloc = FALSE;
2517 }
2518 else
2519 {
2520 if (local_got_offsets == NULL)
2521 abort ();
2522
2523 off = local_got_offsets[r_symndx];
2524
2525 /* The offset must always be a multiple of 4. We use
2526 the least significant bit to record whether we have
2527 already generated the necessary reloc. */
2528 if ((off & 1) != 0)
2529 off &= ~1;
2530 else
2531 {
2532 bfd_put_32 (output_bfd, relocation,
2533 htab->elf.sgot->contents + off);
2534
2535 if (info->shared)
2536 {
2537 asection *srelgot;
2538 Elf_Internal_Rela outrel;
2539 bfd_byte *loc;
2540
2541 srelgot = htab->elf.srelgot;
2542 if (srelgot == NULL)
2543 abort ();
2544
2545 outrel.r_offset = (htab->elf.sgot->output_section->vma
2546 + htab->elf.sgot->output_offset
2547 + off);
2548 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2549 outrel.r_addend = relocation;
2550 loc = srelgot->contents;
2551 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2552 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2553 }
2554
2555 local_got_offsets[r_symndx] |= 1;
2556 }
2557 }
2558
2559 if (off >= (bfd_vma) -2)
2560 abort ();
2561
2562 relocation = base_got->output_offset + off;
2563
2564 /* For @GOTENT the relocation is against the offset between
2565 the instruction and the symbols entry in the GOT and not
2566 between the start of the GOT and the symbols entry. We
2567 add the vma of the GOT to get the correct value. */
2568 if ( r_type == R_390_GOTENT
2569 || r_type == R_390_GOTPLTENT)
2570 relocation += base_got->output_section->vma;
2571
2572 break;
2573
2574 case R_390_GOTOFF16:
2575 case R_390_GOTOFF32:
2576 /* Relocation is relative to the start of the global offset
2577 table. */
2578
2579 /* Note that sgot->output_offset is not involved in this
2580 calculation. We always want the start of .got. If we
2581 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2582 permitted by the ABI, we might have to change this
2583 calculation. */
2584 relocation -= htab->elf.sgot->output_section->vma;
2585 break;
2586
2587 case R_390_GOTPC:
2588 case R_390_GOTPCDBL:
2589 /* Use global offset table as symbol value. */
2590 relocation = htab->elf.sgot->output_section->vma;
2591 unresolved_reloc = FALSE;
2592 break;
2593
2594 case R_390_PLT16DBL:
2595 case R_390_PLT32DBL:
2596 case R_390_PLT32:
2597 /* Relocation is to the entry for this symbol in the
2598 procedure linkage table. */
2599
2600 /* Resolve a PLT32 reloc against a local symbol directly,
2601 without using the procedure linkage table. */
2602 if (h == NULL)
2603 break;
2604
2605 if (h->plt.offset == (bfd_vma) -1
2606 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2607 {
2608 /* We didn't make a PLT entry for this symbol. This
2609 happens when statically linking PIC code, or when
2610 using -Bsymbolic. */
2611 break;
2612 }
2613
2614 if (s390_is_ifunc_symbol_p (h))
2615 relocation = (htab->elf.iplt->output_section->vma
2616 + htab->elf.iplt->output_offset
2617 + h->plt.offset);
2618 else
2619 relocation = (htab->elf.splt->output_section->vma
2620 + htab->elf.splt->output_offset
2621 + h->plt.offset);
2622 unresolved_reloc = FALSE;
2623 break;
2624
2625 case R_390_PLTOFF16:
2626 case R_390_PLTOFF32:
2627 /* Relocation is to the entry for this symbol in the
2628 procedure linkage table relative to the start of the GOT. */
2629
2630 /* For local symbols or if we didn't make a PLT entry for
2631 this symbol resolve the symbol directly. */
2632 if (h == NULL
2633 || h->plt.offset == (bfd_vma) -1
2634 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2635 {
2636 relocation -= htab->elf.sgot->output_section->vma;
2637 break;
2638 }
2639
2640 if (s390_is_ifunc_symbol_p (h))
2641 relocation = (htab->elf.iplt->output_section->vma
2642 + htab->elf.iplt->output_offset
2643 + h->plt.offset
2644 - htab->elf.sgot->output_section->vma);
2645 else
2646 relocation = (htab->elf.splt->output_section->vma
2647 + htab->elf.splt->output_offset
2648 + h->plt.offset
2649 - htab->elf.sgot->output_section->vma);
2650 unresolved_reloc = FALSE;
2651 break;
2652
2653 case R_390_8:
2654 case R_390_16:
2655 case R_390_32:
2656 case R_390_PC16:
2657 case R_390_PC16DBL:
2658 case R_390_PC32DBL:
2659 case R_390_PC32:
2660 if (h != NULL
2661 && s390_is_ifunc_symbol_p (h)
2662 && h->def_regular)
2663 {
2664 if (!info->shared || !h->non_got_ref)
2665 {
2666 /* For a non-shared object STT_GNU_IFUNC symbol must
2667 go through PLT. */
2668 relocation = (htab->elf.iplt->output_section->vma
2669 + htab->elf.iplt->output_offset
2670 + h ->plt.offset);
2671 goto do_relocation;
2672 }
2673 else
2674 {
2675 /* For shared objects a runtime relocation is needed. */
2676
2677 Elf_Internal_Rela outrel;
2678 asection *sreloc;
2679
2680 /* Need a dynamic relocation to get the real function
2681 address. */
2682 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2683 info,
2684 input_section,
2685 rel->r_offset);
2686 if (outrel.r_offset == (bfd_vma) -1
2687 || outrel.r_offset == (bfd_vma) -2)
2688 abort ();
2689
2690 outrel.r_offset += (input_section->output_section->vma
2691 + input_section->output_offset);
2692
2693 if (h->dynindx == -1
2694 || h->forced_local
2695 || info->executable)
2696 {
2697 /* This symbol is resolved locally. */
2698 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2699 outrel.r_addend = (h->root.u.def.value
2700 + h->root.u.def.section->output_section->vma
2701 + h->root.u.def.section->output_offset);
2702 }
2703 else
2704 {
2705 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2706 outrel.r_addend = 0;
2707 }
2708
2709 sreloc = htab->elf.irelifunc;
2710 elf_append_rela (output_bfd, sreloc, &outrel);
2711
2712 /* If this reloc is against an external symbol, we
2713 do not want to fiddle with the addend. Otherwise,
2714 we need to include the symbol value so that it
2715 becomes an addend for the dynamic reloc. For an
2716 internal symbol, we have updated addend. */
2717 continue;
2718 }
2719 }
2720
2721 if ((input_section->flags & SEC_ALLOC) == 0)
2722 break;
2723
2724 if ((info->shared
2725 && (h == NULL
2726 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2727 || h->root.type != bfd_link_hash_undefweak)
2728 && ((r_type != R_390_PC16
2729 && r_type != R_390_PC16DBL
2730 && r_type != R_390_PC32DBL
2731 && r_type != R_390_PC32)
2732 || !SYMBOL_CALLS_LOCAL (info, h)))
2733 || (ELIMINATE_COPY_RELOCS
2734 && !info->shared
2735 && h != NULL
2736 && h->dynindx != -1
2737 && !h->non_got_ref
2738 && ((h->def_dynamic
2739 && !h->def_regular)
2740 || h->root.type == bfd_link_hash_undefweak
2741 || h->root.type == bfd_link_hash_undefined)))
2742 {
2743 Elf_Internal_Rela outrel;
2744 bfd_boolean skip, relocate;
2745 asection *sreloc;
2746 bfd_byte *loc;
2747
2748 /* When generating a shared object, these relocations
2749 are copied into the output file to be resolved at run
2750 time. */
2751
2752 skip = FALSE;
2753 relocate = FALSE;
2754
2755 outrel.r_offset =
2756 _bfd_elf_section_offset (output_bfd, info, input_section,
2757 rel->r_offset);
2758 if (outrel.r_offset == (bfd_vma) -1)
2759 skip = TRUE;
2760 else if (outrel.r_offset == (bfd_vma) -2)
2761 skip = TRUE, relocate = TRUE;
2762 outrel.r_offset += (input_section->output_section->vma
2763 + input_section->output_offset);
2764
2765 if (skip)
2766 memset (&outrel, 0, sizeof outrel);
2767 else if (h != NULL
2768 && h->dynindx != -1
2769 && (r_type == R_390_PC16
2770 || r_type == R_390_PC16DBL
2771 || r_type == R_390_PC32DBL
2772 || r_type == R_390_PC32
2773 || !info->shared
2774 || !SYMBOLIC_BIND (info, h)
2775 || !h->def_regular))
2776 {
2777 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2778 outrel.r_addend = rel->r_addend;
2779 }
2780 else
2781 {
2782 /* This symbol is local, or marked to become local. */
2783 outrel.r_addend = relocation + rel->r_addend;
2784 if (r_type == R_390_32)
2785 {
2786 relocate = TRUE;
2787 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2788 }
2789 else
2790 {
2791 long sindx;
2792
2793 if (bfd_is_abs_section (sec))
2794 sindx = 0;
2795 else if (sec == NULL || sec->owner == NULL)
2796 {
2797 bfd_set_error(bfd_error_bad_value);
2798 return FALSE;
2799 }
2800 else
2801 {
2802 asection *osec;
2803
2804 osec = sec->output_section;
2805 sindx = elf_section_data (osec)->dynindx;
2806 if (sindx == 0)
2807 {
2808 osec = htab->elf.text_index_section;
2809 sindx = elf_section_data (osec)->dynindx;
2810 }
2811 BFD_ASSERT (sindx != 0);
2812
2813 /* We are turning this relocation into one
2814 against a section symbol, so subtract out
2815 the output section's address but not the
2816 offset of the input section in the output
2817 section. */
2818 outrel.r_addend -= osec->vma;
2819 }
2820 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2821 }
2822 }
2823
2824 sreloc = elf_section_data (input_section)->sreloc;
2825 if (sreloc == NULL)
2826 abort ();
2827
2828 loc = sreloc->contents;
2829 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2830 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2831
2832 /* If this reloc is against an external symbol, we do
2833 not want to fiddle with the addend. Otherwise, we
2834 need to include the symbol value so that it becomes
2835 an addend for the dynamic reloc. */
2836 if (! relocate)
2837 continue;
2838 }
2839 break;
2840
2841 /* Relocations for tls literal pool entries. */
2842 case R_390_TLS_IE32:
2843 if (info->shared)
2844 {
2845 Elf_Internal_Rela outrel;
2846 asection *sreloc;
2847 bfd_byte *loc;
2848
2849 outrel.r_offset = rel->r_offset
2850 + input_section->output_section->vma
2851 + input_section->output_offset;
2852 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2853 sreloc = elf_section_data (input_section)->sreloc;
2854 if (sreloc == NULL)
2855 abort ();
2856 loc = sreloc->contents;
2857 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2858 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2859 }
2860 /* Fall through. */
2861
2862 case R_390_TLS_GD32:
2863 case R_390_TLS_GOTIE32:
2864 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2865 tls_type = GOT_UNKNOWN;
2866 if (h == NULL && local_got_offsets)
2867 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2868 else if (h != NULL)
2869 {
2870 tls_type = elf_s390_hash_entry(h)->tls_type;
2871 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2872 r_type = R_390_TLS_LE32;
2873 }
2874 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2875 r_type = R_390_TLS_IE32;
2876
2877 if (r_type == R_390_TLS_LE32)
2878 {
2879 /* This relocation gets optimized away by the local exec
2880 access optimization. */
2881 BFD_ASSERT (! unresolved_reloc);
2882 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2883 contents + rel->r_offset);
2884 continue;
2885 }
2886
2887 if (htab->elf.sgot == NULL)
2888 abort ();
2889
2890 if (h != NULL)
2891 off = h->got.offset;
2892 else
2893 {
2894 if (local_got_offsets == NULL)
2895 abort ();
2896
2897 off = local_got_offsets[r_symndx];
2898 }
2899
2900 emit_tls_relocs:
2901
2902 if ((off & 1) != 0)
2903 off &= ~1;
2904 else
2905 {
2906 Elf_Internal_Rela outrel;
2907 bfd_byte *loc;
2908 int dr_type, indx;
2909
2910 if (htab->elf.srelgot == NULL)
2911 abort ();
2912
2913 outrel.r_offset = (htab->elf.sgot->output_section->vma
2914 + htab->elf.sgot->output_offset + off);
2915
2916 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2917 if (r_type == R_390_TLS_GD32)
2918 dr_type = R_390_TLS_DTPMOD;
2919 else
2920 dr_type = R_390_TLS_TPOFF;
2921 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2922 outrel.r_addend = relocation - dtpoff_base (info);
2923 else
2924 outrel.r_addend = 0;
2925 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2926 loc = htab->elf.srelgot->contents;
2927 loc += htab->elf.srelgot->reloc_count++
2928 * sizeof (Elf32_External_Rela);
2929 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2930
2931 if (r_type == R_390_TLS_GD32)
2932 {
2933 if (indx == 0)
2934 {
2935 BFD_ASSERT (! unresolved_reloc);
2936 bfd_put_32 (output_bfd,
2937 relocation - dtpoff_base (info),
2938 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2939 }
2940 else
2941 {
2942 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2943 outrel.r_offset += GOT_ENTRY_SIZE;
2944 outrel.r_addend = 0;
2945 htab->elf.srelgot->reloc_count++;
2946 loc += sizeof (Elf32_External_Rela);
2947 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2948 }
2949 }
2950
2951 if (h != NULL)
2952 h->got.offset |= 1;
2953 else
2954 local_got_offsets[r_symndx] |= 1;
2955 }
2956
2957 if (off >= (bfd_vma) -2)
2958 abort ();
2959 if (r_type == ELF32_R_TYPE (rel->r_info))
2960 {
2961 relocation = htab->elf.sgot->output_offset + off;
2962 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2963 relocation += htab->elf.sgot->output_section->vma;
2964 unresolved_reloc = FALSE;
2965 }
2966 else
2967 {
2968 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
2969 contents + rel->r_offset);
2970 continue;
2971 }
2972 break;
2973
2974 case R_390_TLS_GOTIE12:
2975 case R_390_TLS_GOTIE20:
2976 case R_390_TLS_IEENT:
2977 if (h == NULL)
2978 {
2979 if (local_got_offsets == NULL)
2980 abort();
2981 off = local_got_offsets[r_symndx];
2982 if (info->shared)
2983 goto emit_tls_relocs;
2984 }
2985 else
2986 {
2987 off = h->got.offset;
2988 tls_type = elf_s390_hash_entry(h)->tls_type;
2989 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2990 goto emit_tls_relocs;
2991 }
2992
2993 if (htab->elf.sgot == NULL)
2994 abort ();
2995
2996 BFD_ASSERT (! unresolved_reloc);
2997 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2998 htab->elf.sgot->contents + off);
2999 relocation = htab->elf.sgot->output_offset + off;
3000 if (r_type == R_390_TLS_IEENT)
3001 relocation += htab->elf.sgot->output_section->vma;
3002 unresolved_reloc = FALSE;
3003 break;
3004
3005 case R_390_TLS_LDM32:
3006 if (! info->shared)
3007 /* The literal pool entry this relocation refers to gets ignored
3008 by the optimized code of the local exec model. Do nothing
3009 and the value will turn out zero. */
3010 continue;
3011
3012 if (htab->elf.sgot == NULL)
3013 abort ();
3014
3015 off = htab->tls_ldm_got.offset;
3016 if (off & 1)
3017 off &= ~1;
3018 else
3019 {
3020 Elf_Internal_Rela outrel;
3021 bfd_byte *loc;
3022
3023 if (htab->elf.srelgot == NULL)
3024 abort ();
3025
3026 outrel.r_offset = (htab->elf.sgot->output_section->vma
3027 + htab->elf.sgot->output_offset + off);
3028
3029 bfd_put_32 (output_bfd, 0,
3030 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3031 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
3032 outrel.r_addend = 0;
3033 loc = htab->elf.srelgot->contents;
3034 loc += htab->elf.srelgot->reloc_count++
3035 * sizeof (Elf32_External_Rela);
3036 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3037 htab->tls_ldm_got.offset |= 1;
3038 }
3039 relocation = htab->elf.sgot->output_offset + off;
3040 unresolved_reloc = FALSE;
3041 break;
3042
3043 case R_390_TLS_LE32:
3044 if (info->shared)
3045 {
3046 /* Linking a shared library with non-fpic code requires
3047 a R_390_TLS_TPOFF relocation. */
3048 Elf_Internal_Rela outrel;
3049 asection *sreloc;
3050 bfd_byte *loc;
3051 int indx;
3052
3053 outrel.r_offset = rel->r_offset
3054 + input_section->output_section->vma
3055 + input_section->output_offset;
3056 if (h != NULL && h->dynindx != -1)
3057 indx = h->dynindx;
3058 else
3059 indx = 0;
3060 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
3061 if (indx == 0)
3062 outrel.r_addend = relocation - dtpoff_base (info);
3063 else
3064 outrel.r_addend = 0;
3065 sreloc = elf_section_data (input_section)->sreloc;
3066 if (sreloc == NULL)
3067 abort ();
3068 loc = sreloc->contents;
3069 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3070 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3071 }
3072 else
3073 {
3074 BFD_ASSERT (! unresolved_reloc);
3075 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3076 contents + rel->r_offset);
3077 }
3078 continue;
3079
3080 case R_390_TLS_LDO32:
3081 if (info->shared || (input_section->flags & SEC_DEBUGGING))
3082 relocation -= dtpoff_base (info);
3083 else
3084 /* When converting LDO to LE, we must negate. */
3085 relocation = -tpoff (info, relocation);
3086 break;
3087
3088 /* Relocations for tls instructions. */
3089 case R_390_TLS_LOAD:
3090 case R_390_TLS_GDCALL:
3091 case R_390_TLS_LDCALL:
3092 tls_type = GOT_UNKNOWN;
3093 if (h == NULL && local_got_offsets)
3094 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3095 else if (h != NULL)
3096 tls_type = elf_s390_hash_entry(h)->tls_type;
3097
3098 if (tls_type == GOT_TLS_GD)
3099 continue;
3100
3101 if (r_type == R_390_TLS_LOAD)
3102 {
3103 if (!info->shared && (h == NULL || h->dynindx == -1))
3104 {
3105 /* IE->LE transition. Four valid cases:
3106 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
3107 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
3108 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
3109 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3110 unsigned int insn, ry;
3111
3112 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3113 ry = 0;
3114 if ((insn & 0xff00f000) == 0x58000000)
3115 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
3116 ry = (insn & 0x000f0000);
3117 else if ((insn & 0xff0f0000) == 0x58000000)
3118 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
3119 ry = (insn & 0x0000f000) << 4;
3120 else if ((insn & 0xff00f000) == 0x5800c000)
3121 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
3122 ry = (insn & 0x000f0000);
3123 else if ((insn & 0xff0f0000) == 0x580c0000)
3124 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3125 ry = (insn & 0x0000f000) << 4;
3126 else
3127 invalid_tls_insn (input_bfd, input_section, rel);
3128 insn = 0x18000700 | (insn & 0x00f00000) | ry;
3129 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3130 }
3131 }
3132 else if (r_type == R_390_TLS_GDCALL)
3133 {
3134 unsigned int insn;
3135
3136 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3137 if ((insn & 0xff000fff) != 0x4d000000 &&
3138 (insn & 0xffff0000) != 0xc0e50000 &&
3139 (insn & 0xff000000) != 0x0d000000)
3140 invalid_tls_insn (input_bfd, input_section, rel);
3141 if (!info->shared && (h == NULL || h->dynindx == -1))
3142 {
3143 if ((insn & 0xff000000) == 0x0d000000)
3144 {
3145 /* GD->LE transition.
3146 basr rx, ry -> nopr r7 */
3147 insn = 0x07070000 | (insn & 0xffff);
3148 }
3149 else if ((insn & 0xff000000) == 0x4d000000)
3150 {
3151 /* GD->LE transition.
3152 bas %r14,0(%rx,%r13) -> bc 0,0 */
3153 insn = 0x47000000;
3154 }
3155 else
3156 {
3157 /* GD->LE transition.
3158 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
3159 insn = 0xc0040000;
3160 bfd_put_16 (output_bfd, 0x0000,
3161 contents + rel->r_offset + 4);
3162 }
3163 }
3164 else
3165 {
3166 /* If basr is used in the pic case to invoke
3167 _tls_get_offset, something went wrong before. */
3168 if ((insn & 0xff000000) == 0x0d000000)
3169 invalid_tls_insn (input_bfd, input_section, rel);
3170
3171 if ((insn & 0xff000000) == 0x4d000000)
3172 {
3173 /* GD->IE transition.
3174 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3175 insn = 0x5822c000;
3176 }
3177 else
3178 {
3179 /* GD->IE transition.
3180 brasl %r14,__tls_get_addr@plt ->
3181 l %r2,0(%r2,%r12) ; bcr 0,0 */
3182 insn = 0x5822c000;
3183 bfd_put_16 (output_bfd, 0x0700,
3184 contents + rel->r_offset + 4);
3185 }
3186 }
3187 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3188 }
3189 else if (r_type == R_390_TLS_LDCALL)
3190 {
3191 if (!info->shared)
3192 {
3193 unsigned int insn;
3194
3195 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3196 if ((insn & 0xff000fff) != 0x4d000000 &&
3197 (insn & 0xffff0000) != 0xc0e50000 &&
3198 (insn & 0xff000000) != 0x0d000000)
3199 invalid_tls_insn (input_bfd, input_section, rel);
3200
3201 if ((insn & 0xff000000) == 0x0d000000)
3202 {
3203 /* LD->LE transition.
3204 basr rx, ry -> nopr r7 */
3205 insn = 0x07070000 | (insn & 0xffff);
3206 }
3207 else if ((insn & 0xff000000) == 0x4d000000)
3208 {
3209 /* LD->LE transition.
3210 bas %r14,0(%rx,%r13) -> bc 0,0 */
3211 insn = 0x47000000;
3212 }
3213 else
3214 {
3215 /* LD->LE transition.
3216 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3217 insn = 0xc0040000;
3218 bfd_put_16 (output_bfd, 0x0000,
3219 contents + rel->r_offset + 4);
3220 }
3221 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3222 }
3223 }
3224 continue;
3225
3226 default:
3227 break;
3228 }
3229
3230 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3231 because such sections are not SEC_ALLOC and thus ld.so will
3232 not process them. */
3233 if (unresolved_reloc
3234 && !((input_section->flags & SEC_DEBUGGING) != 0
3235 && h->def_dynamic)
3236 && _bfd_elf_section_offset (output_bfd, info, input_section,
3237 rel->r_offset) != (bfd_vma) -1)
3238 (*_bfd_error_handler)
3239 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3240 input_bfd,
3241 input_section,
3242 (long) rel->r_offset,
3243 howto->name,
3244 h->root.root.string);
3245
3246 do_relocation:
3247
3248 if (r_type == R_390_20
3249 || r_type == R_390_GOT20
3250 || r_type == R_390_GOTPLT20
3251 || r_type == R_390_TLS_GOTIE20)
3252 {
3253 relocation += rel->r_addend;
3254 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3255 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3256 contents, rel->r_offset,
3257 relocation, 0);
3258 }
3259 else
3260 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3261 contents, rel->r_offset,
3262 relocation, rel->r_addend);
3263
3264 if (r != bfd_reloc_ok)
3265 {
3266 const char *name;
3267
3268 if (h != NULL)
3269 name = h->root.root.string;
3270 else
3271 {
3272 name = bfd_elf_string_from_elf_section (input_bfd,
3273 symtab_hdr->sh_link,
3274 sym->st_name);
3275 if (name == NULL)
3276 return FALSE;
3277 if (*name == '\0')
3278 name = bfd_section_name (input_bfd, sec);
3279 }
3280
3281 if (r == bfd_reloc_overflow)
3282 {
3283
3284 if (! ((*info->callbacks->reloc_overflow)
3285 (info, (h ? &h->root : NULL), name, howto->name,
3286 (bfd_vma) 0, input_bfd, input_section,
3287 rel->r_offset)))
3288 return FALSE;
3289 }
3290 else
3291 {
3292 (*_bfd_error_handler)
3293 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3294 input_bfd, input_section,
3295 (long) rel->r_offset, name, (int) r);
3296 return FALSE;
3297 }
3298 }
3299 }
3300
3301 return TRUE;
3302 }
3303
3304 /* Generate the PLT slots together with the dynamic relocations needed
3305 for IFUNC symbols. */
3306
3307 static void
3308 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3309 struct bfd_link_info *info,
3310 struct elf_link_hash_entry *h,
3311 struct elf_s390_link_hash_table *htab,
3312 bfd_vma iplt_offset,
3313 bfd_vma resolver_address)
3314 {
3315 bfd_vma iplt_index;
3316 bfd_vma got_offset;
3317 bfd_vma igotiplt_offset;
3318 Elf_Internal_Rela rela;
3319 bfd_byte *loc;
3320 asection *plt, *gotplt, *relplt;
3321 bfd_vma relative_offset;
3322
3323 if (htab->elf.iplt == NULL
3324 || htab->elf.igotplt == NULL
3325 || htab->elf.irelplt == NULL)
3326 abort ();
3327
3328 gotplt = htab->elf.igotplt;
3329 relplt = htab->elf.irelplt;
3330
3331 /* Index of the PLT slot within iplt section. */
3332 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3333 plt = htab->elf.iplt;
3334 /* Offset into the igot.plt section. */
3335 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3336 /* Offset into the got section. */
3337 got_offset = igotiplt_offset + gotplt->output_offset;
3338
3339 /* S390 uses halfwords for relative branch calc! */
3340 relative_offset = - (plt->output_offset +
3341 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3342 /* If offset is > 32768, branch to a previous branch
3343 390 can only handle +-64 K jumps. */
3344 if ( -32768 > (int) relative_offset )
3345 relative_offset
3346 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3347
3348 /* Fill in the entry in the procedure linkage table. */
3349 if (!info->shared)
3350 {
3351 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3352 PLT_ENTRY_SIZE);
3353
3354 /* Adjust jump to the first plt entry. */
3355 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3356 plt->contents + iplt_offset + 20);
3357
3358 /* Push the GOT offset field. */
3359 bfd_put_32 (output_bfd,
3360 (gotplt->output_section->vma
3361 + got_offset),
3362 plt->contents + iplt_offset + 24);
3363 }
3364 else if (got_offset < 4096)
3365 {
3366 /* The GOT offset is small enough to be used directly as
3367 displacement. */
3368 memcpy (plt->contents + iplt_offset,
3369 elf_s390_plt_pic12_entry,
3370 PLT_ENTRY_SIZE);
3371
3372 /* Put in the GOT offset as displacement value. The 0xc000
3373 value comes from the first word of the plt entry. Look
3374 at the elf_s390_plt_pic16_entry content. */
3375 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3376 plt->contents + iplt_offset + 2);
3377
3378 /* Adjust the jump to the first plt entry. */
3379 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3380 plt->contents + iplt_offset + 20);
3381 }
3382 else if (got_offset < 32768)
3383 {
3384 /* The GOT offset is too big for a displacement but small
3385 enough to be a signed 16 bit immediate value as it can be
3386 used in an lhi instruction. */
3387 memcpy (plt->contents + iplt_offset,
3388 elf_s390_plt_pic16_entry,
3389 PLT_ENTRY_SIZE);
3390
3391 /* Put in the GOT offset for the lhi instruction. */
3392 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3393 plt->contents + iplt_offset + 2);
3394
3395 /* Adjust the jump to the first plt entry. */
3396 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3397 plt->contents + iplt_offset + 20);
3398 }
3399 else
3400 {
3401 memcpy (plt->contents + iplt_offset,
3402 elf_s390_plt_pic_entry,
3403 PLT_ENTRY_SIZE);
3404
3405 /* Adjust the jump to the first plt entry. */
3406 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3407 plt->contents + iplt_offset + 20);
3408
3409 /* Push the GOT offset field. */
3410 bfd_put_32 (output_bfd, got_offset,
3411 plt->contents + iplt_offset + 24);
3412 }
3413 /* Insert offset into reloc. table here. */
3414 bfd_put_32 (output_bfd, relplt->output_offset +
3415 iplt_index * RELA_ENTRY_SIZE,
3416 plt->contents + iplt_offset + 28);
3417
3418 /* Fill in the entry in the global offset table.
3419 Points to instruction after GOT offset. */
3420 bfd_put_32 (output_bfd,
3421 (plt->output_section->vma
3422 + plt->output_offset
3423 + iplt_offset
3424 + 12),
3425 gotplt->contents + igotiplt_offset);
3426
3427 /* Fill in the entry in the .rela.plt section. */
3428 rela.r_offset = gotplt->output_section->vma + got_offset;
3429
3430 if (!h
3431 || h->dynindx == -1
3432 || ((info->executable
3433 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3434 && h->def_regular))
3435 {
3436 /* The symbol can be locally resolved. */
3437 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3438 rela.r_addend = resolver_address;
3439 }
3440 else
3441 {
3442 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3443 rela.r_addend = 0;
3444 }
3445
3446 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3447 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3448 }
3449
3450 /* Finish up dynamic symbol handling. We set the contents of various
3451 dynamic sections here. */
3452
3453 static bfd_boolean
3454 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3455 struct bfd_link_info *info,
3456 struct elf_link_hash_entry *h,
3457 Elf_Internal_Sym *sym)
3458 {
3459 struct elf_s390_link_hash_table *htab;
3460 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3461
3462 htab = elf_s390_hash_table (info);
3463
3464 if (h->plt.offset != (bfd_vma) -1)
3465 {
3466 bfd_vma plt_index;
3467 bfd_vma got_offset;
3468 Elf_Internal_Rela rela;
3469 bfd_byte *loc;
3470 bfd_vma relative_offset;
3471
3472 /* This symbol has an entry in the procedure linkage table. Set
3473 it up. */
3474 if (s390_is_ifunc_symbol_p (h))
3475 {
3476 /* If we can resolve the IFUNC symbol locally we generate an
3477 IRELATIVE reloc. */
3478 elf_s390_finish_ifunc_symbol (output_bfd, info, h, htab, h->plt.offset,
3479 eh->ifunc_resolver_address +
3480 eh->ifunc_resolver_section->output_offset +
3481 eh->ifunc_resolver_section->output_section->vma);
3482 /* Fallthrough. Handling of explicit GOT slots of IFUNC
3483 symbols is below. */
3484 }
3485 else
3486 {
3487 if (h->dynindx == -1
3488 || htab->elf.splt == NULL
3489 || htab->elf.sgotplt == NULL
3490 || htab->elf.srelplt == NULL)
3491 abort ();
3492
3493 /* Calc. index no.
3494 Current offset - size first entry / entry size. */
3495 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3496
3497 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3498 addr & GOT addr. */
3499 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3500
3501 /* S390 uses halfwords for relative branch calc! */
3502 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3503 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3504 /* If offset is > 32768, branch to a previous branch
3505 390 can only handle +-64 K jumps. */
3506 if ( -32768 > (int) relative_offset )
3507 relative_offset
3508 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3509
3510 /* Fill in the entry in the procedure linkage table. */
3511 if (!info->shared)
3512 {
3513 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3514 PLT_ENTRY_SIZE);
3515
3516 /* Adjust jump to the first plt entry. */
3517 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3518 htab->elf.splt->contents + h->plt.offset + 20);
3519
3520 /* Push the GOT offset field. */
3521 bfd_put_32 (output_bfd,
3522 (htab->elf.sgotplt->output_section->vma
3523 + htab->elf.sgotplt->output_offset
3524 + got_offset),
3525 htab->elf.splt->contents + h->plt.offset + 24);
3526 }
3527 else if (got_offset < 4096)
3528 {
3529 /* The GOT offset is small enough to be used directly as
3530 displacement. */
3531 memcpy (htab->elf.splt->contents + h->plt.offset,
3532 elf_s390_plt_pic12_entry,
3533 PLT_ENTRY_SIZE);
3534
3535 /* Put in the GOT offset as displacement value. The 0xc000
3536 value comes from the first word of the plt entry. Look
3537 at the elf_s390_plt_pic16_entry content. */
3538 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3539 htab->elf.splt->contents + h->plt.offset + 2);
3540
3541 /* Adjust the jump to the first plt entry. */
3542 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3543 htab->elf.splt->contents + h->plt.offset + 20);
3544 }
3545 else if (got_offset < 32768)
3546 {
3547 /* The GOT offset is too big for a displacement but small
3548 enough to be a signed 16 bit immediate value as it can be
3549 used in an lhi instruction. */
3550 memcpy (htab->elf.splt->contents + h->plt.offset,
3551 elf_s390_plt_pic16_entry,
3552 PLT_ENTRY_SIZE);
3553
3554 /* Put in the GOT offset for the lhi instruction. */
3555 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3556 htab->elf.splt->contents + h->plt.offset + 2);
3557
3558 /* Adjust the jump to the first plt entry. */
3559 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3560 htab->elf.splt->contents + h->plt.offset + 20);
3561 }
3562 else
3563 {
3564 memcpy (htab->elf.splt->contents + h->plt.offset,
3565 elf_s390_plt_pic_entry,
3566 PLT_ENTRY_SIZE);
3567
3568 /* Adjust the jump to the first plt entry. */
3569 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3570 htab->elf.splt->contents + h->plt.offset + 20);
3571
3572 /* Push the GOT offset field. */
3573 bfd_put_32 (output_bfd, got_offset,
3574 htab->elf.splt->contents + h->plt.offset + 24);
3575 }
3576 /* Insert offset into reloc. table here. */
3577 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3578 htab->elf.splt->contents + h->plt.offset + 28);
3579
3580 /* Fill in the entry in the global offset table.
3581 Points to instruction after GOT offset. */
3582 bfd_put_32 (output_bfd,
3583 (htab->elf.splt->output_section->vma
3584 + htab->elf.splt->output_offset
3585 + h->plt.offset
3586 + 12),
3587 htab->elf.sgotplt->contents + got_offset);
3588
3589 /* Fill in the entry in the .rela.plt section. */
3590 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3591 + htab->elf.sgotplt->output_offset
3592 + got_offset);
3593 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3594 rela.r_addend = 0;
3595 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3596 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3597
3598 if (!h->def_regular)
3599 {
3600 /* Mark the symbol as undefined, rather than as defined in
3601 the .plt section. Leave the value alone. This is a clue
3602 for the dynamic linker, to make function pointer
3603 comparisons work between an application and shared
3604 library. */
3605 sym->st_shndx = SHN_UNDEF;
3606 }
3607 }
3608 }
3609
3610 if (h->got.offset != (bfd_vma) -1
3611 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3612 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3613 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3614 {
3615 Elf_Internal_Rela rela;
3616 bfd_byte *loc;
3617
3618 /* This symbol has an entry in the global offset table. Set it
3619 up. */
3620
3621 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3622 abort ();
3623
3624 rela.r_offset = (htab->elf.sgot->output_section->vma
3625 + htab->elf.sgot->output_offset
3626 + (h->got.offset &~ (bfd_vma) 1));
3627
3628 /* If this is a static link, or it is a -Bsymbolic link and the
3629 symbol is defined locally or was forced to be local because
3630 of a version file, we just want to emit a RELATIVE reloc.
3631 The entry in the global offset table will already have been
3632 initialized in the relocate_section function. */
3633 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3634 {
3635 if (info->shared)
3636 {
3637 /* An explicit GOT slot usage needs GLOB_DAT. If the
3638 symbol references local the implicit got.iplt slot
3639 will be used and the IRELATIVE reloc has been created
3640 above. */
3641 goto do_glob_dat;
3642 }
3643 else
3644 {
3645 /* For non-shared objects explicit GOT slots must be
3646 filled with the PLT slot address for pointer
3647 equality reasons. */
3648 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3649 + htab->elf.iplt->output_offset
3650 + h->plt.offset),
3651 htab->elf.sgot->contents + h->got.offset);
3652 return TRUE;
3653 }
3654 }
3655 else if (info->shared
3656 && SYMBOL_REFERENCES_LOCAL (info, h))
3657 {
3658 /* If this is a static link, or it is a -Bsymbolic link and
3659 the symbol is defined locally or was forced to be local
3660 because of a version file, we just want to emit a
3661 RELATIVE reloc. The entry in the global offset table
3662 will already have been initialized in the
3663 relocate_section function. */
3664 if (!h->def_regular)
3665 return FALSE;
3666 BFD_ASSERT((h->got.offset & 1) != 0);
3667 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3668 rela.r_addend = (h->root.u.def.value
3669 + h->root.u.def.section->output_section->vma
3670 + h->root.u.def.section->output_offset);
3671 }
3672 else
3673 {
3674 BFD_ASSERT((h->got.offset & 1) == 0);
3675 do_glob_dat:
3676 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3677 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3678 rela.r_addend = 0;
3679 }
3680
3681 loc = htab->elf.srelgot->contents;
3682 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3683 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3684 }
3685
3686 if (h->needs_copy)
3687 {
3688 Elf_Internal_Rela rela;
3689 bfd_byte *loc;
3690
3691 /* This symbols needs a copy reloc. Set it up. */
3692
3693 if (h->dynindx == -1
3694 || (h->root.type != bfd_link_hash_defined
3695 && h->root.type != bfd_link_hash_defweak)
3696 || htab->srelbss == NULL)
3697 abort ();
3698
3699 rela.r_offset = (h->root.u.def.value
3700 + h->root.u.def.section->output_section->vma
3701 + h->root.u.def.section->output_offset);
3702 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3703 rela.r_addend = 0;
3704 loc = htab->srelbss->contents;
3705 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3706 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3707 }
3708
3709 /* Mark some specially defined symbols as absolute. */
3710 if (h == htab->elf.hdynamic
3711 || h == htab->elf.hgot
3712 || h == htab->elf.hplt)
3713 sym->st_shndx = SHN_ABS;
3714
3715 return TRUE;
3716 }
3717
3718 /* Used to decide how to sort relocs in an optimal manner for the
3719 dynamic linker, before writing them out. */
3720
3721 static enum elf_reloc_type_class
3722 elf_s390_reloc_type_class (const Elf_Internal_Rela *rela)
3723 {
3724 switch ((int) ELF32_R_TYPE (rela->r_info))
3725 {
3726 case R_390_RELATIVE:
3727 return reloc_class_relative;
3728 case R_390_JMP_SLOT:
3729 return reloc_class_plt;
3730 case R_390_COPY:
3731 return reloc_class_copy;
3732 default:
3733 return reloc_class_normal;
3734 }
3735 }
3736
3737 /* Finish up the dynamic sections. */
3738
3739 static bfd_boolean
3740 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3741 struct bfd_link_info *info)
3742 {
3743 struct elf_s390_link_hash_table *htab;
3744 bfd *dynobj;
3745 asection *sdyn;
3746 bfd *ibfd;
3747 unsigned int i;
3748
3749 htab = elf_s390_hash_table (info);
3750 dynobj = htab->elf.dynobj;
3751 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3752
3753 if (htab->elf.dynamic_sections_created)
3754 {
3755 Elf32_External_Dyn *dyncon, *dynconend;
3756
3757 if (sdyn == NULL || htab->elf.sgot == NULL)
3758 abort ();
3759
3760 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3761 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3762 for (; dyncon < dynconend; dyncon++)
3763 {
3764 Elf_Internal_Dyn dyn;
3765 asection *s;
3766
3767 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3768
3769 switch (dyn.d_tag)
3770 {
3771 default:
3772 continue;
3773
3774 case DT_PLTGOT:
3775 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma;
3776 break;
3777
3778 case DT_JMPREL:
3779 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
3780 break;
3781
3782 case DT_PLTRELSZ:
3783 s = htab->elf.srelplt->output_section;
3784 dyn.d_un.d_val = s->size;
3785 break;
3786 }
3787
3788 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3789 }
3790
3791 /* Fill in the special first entry in the procedure linkage table. */
3792 if (htab->elf.splt && htab->elf.splt->size > 0)
3793 {
3794 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3795 if (info->shared)
3796 {
3797 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3798 PLT_FIRST_ENTRY_SIZE);
3799 }
3800 else
3801 {
3802 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3803 PLT_FIRST_ENTRY_SIZE);
3804 bfd_put_32 (output_bfd,
3805 htab->elf.sgotplt->output_section->vma
3806 + htab->elf.sgotplt->output_offset,
3807 htab->elf.splt->contents + 24);
3808 }
3809 elf_section_data (htab->elf.splt->output_section)
3810 ->this_hdr.sh_entsize = 4;
3811 }
3812
3813 }
3814
3815 if (htab->elf.sgotplt)
3816 {
3817 /* Fill in the first three entries in the global offset table. */
3818 if (htab->elf.sgotplt->size > 0)
3819 {
3820 bfd_put_32 (output_bfd,
3821 (sdyn == NULL ? (bfd_vma) 0
3822 : sdyn->output_section->vma + sdyn->output_offset),
3823 htab->elf.sgotplt->contents);
3824 /* One entry for shared object struct ptr. */
3825 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3826 /* One entry for _dl_runtime_resolve. */
3827 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3828 }
3829
3830 elf_section_data (htab->elf.sgotplt->output_section)
3831 ->this_hdr.sh_entsize = 4;
3832 }
3833 /* Finish dynamic symbol for local IFUNC symbols. */
3834 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
3835 {
3836 struct plt_entry *local_plt;
3837 Elf_Internal_Sym *isym;
3838 Elf_Internal_Shdr *symtab_hdr;
3839
3840 symtab_hdr = &elf_symtab_hdr (ibfd);
3841
3842 local_plt = elf_s390_local_plt (ibfd);
3843 if (local_plt != NULL)
3844 for (i = 0; i < symtab_hdr->sh_info; i++)
3845 {
3846 if (local_plt[i].plt.offset != (bfd_vma) -1)
3847 {
3848 asection *sec = local_plt[i].sec;
3849 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3850 if (isym == NULL)
3851 return FALSE;
3852
3853 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3854 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3855 local_plt[i].plt.offset,
3856 isym->st_value
3857 + sec->output_section->vma
3858 + sec->output_offset);
3859
3860 }
3861 }
3862 }
3863 return TRUE;
3864 }
3865
3866 static bfd_boolean
3867 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3868 {
3869 int offset;
3870 unsigned int size;
3871
3872 switch (note->descsz)
3873 {
3874 default:
3875 return FALSE;
3876
3877 case 224: /* S/390 Linux. */
3878 /* pr_cursig */
3879 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3880
3881 /* pr_pid */
3882 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
3883
3884 /* pr_reg */
3885 offset = 72;
3886 size = 144;
3887 break;
3888 }
3889
3890 /* Make a ".reg/999" section. */
3891 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3892 size, note->descpos + offset);
3893 }
3894
3895 /* Return address for Ith PLT stub in section PLT, for relocation REL
3896 or (bfd_vma) -1 if it should not be included. */
3897
3898 static bfd_vma
3899 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3900 const arelent *rel ATTRIBUTE_UNUSED)
3901 {
3902 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3903 }
3904
3905 static bfd_boolean
3906 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3907 {
3908 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3909 return TRUE;
3910 }
3911
3912
3913 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3914 #define TARGET_BIG_NAME "elf32-s390"
3915 #define ELF_ARCH bfd_arch_s390
3916 #define ELF_TARGET_ID S390_ELF_DATA
3917 #define ELF_MACHINE_CODE EM_S390
3918 #define ELF_MACHINE_ALT1 EM_S390_OLD
3919 #define ELF_MAXPAGESIZE 0x1000
3920
3921 #define elf_backend_can_gc_sections 1
3922 #define elf_backend_can_refcount 1
3923 #define elf_backend_want_got_plt 1
3924 #define elf_backend_plt_readonly 1
3925 #define elf_backend_want_plt_sym 0
3926 #define elf_backend_got_header_size 12
3927 #define elf_backend_rela_normal 1
3928
3929 #define elf_info_to_howto elf_s390_info_to_howto
3930
3931 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3932 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3933 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3934 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3935
3936 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
3937
3938 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3939 #define elf_backend_check_relocs elf_s390_check_relocs
3940 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3941 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3942 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3943 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3944 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3945 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3946 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3947 #define elf_backend_relocate_section elf_s390_relocate_section
3948 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3949 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3950 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3951 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3952 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3953 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
3954
3955 #define bfd_elf32_mkobject elf_s390_mkobject
3956 #define elf_backend_object_p elf_s390_object_p
3957
3958 #include "elf32-target.h"
GDB Binutils - Deliverables
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