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[binutils.git] / bfd / elf64-s390.c
blob3424d622d2859b23481f24d6347cf9af4742ab40
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
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 2 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., 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 static asection *elf_s390_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52 static bfd_boolean elf_s390_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55 struct elf_s390_link_hash_entry;
56 static void elf_s390_adjust_gotplt
57 PARAMS ((struct elf_s390_link_hash_entry *));
58 static bfd_boolean elf_s390_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
60 static bfd_boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static bfd_boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static bfd_boolean elf_s390_size_dynamic_sections
65 PARAMS ((bfd *, struct bfd_link_info *));
66 static bfd_boolean elf_s390_relocate_section
67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
69 static bfd_boolean elf_s390_finish_dynamic_symbol
70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
71 Elf_Internal_Sym *));
72 static enum elf_reloc_type_class elf_s390_reloc_type_class
73 PARAMS ((const Elf_Internal_Rela *));
74 static bfd_boolean elf_s390_finish_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76 static bfd_boolean elf_s390_mkobject
77 PARAMS ((bfd *));
78 static bfd_boolean elf_s390_object_p
79 PARAMS ((bfd *));
80 static int elf_s390_tls_transition
81 PARAMS ((struct bfd_link_info *, int, int));
82 static bfd_reloc_status_type s390_tls_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84 static bfd_vma dtpoff_base
85 PARAMS ((struct bfd_link_info *));
86 static bfd_vma tpoff
87 PARAMS ((struct bfd_link_info *, bfd_vma));
88 static void invalid_tls_insn
89 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
90 static bfd_reloc_status_type s390_elf_ldisp_reloc
91 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
92
93 #include "elf/s390.h"
94
95 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
96 from smaller values. Start with zero, widen, *then* decrement. */
97 #define MINUS_ONE (((bfd_vma)0) - 1)
98
99 /* The relocation "howto" table. */
100 static reloc_howto_type elf_howto_table[] =
101 {
102 HOWTO (R_390_NONE, /* type */
103 0, /* rightshift */
104 0, /* size (0 = byte, 1 = short, 2 = long) */
105 0, /* bitsize */
106 FALSE, /* pc_relative */
107 0, /* bitpos */
108 complain_overflow_dont, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_390_NONE", /* name */
111 FALSE, /* partial_inplace */
112 0, /* src_mask */
113 0, /* dst_mask */
114 FALSE), /* pcrel_offset */
115
116 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
118 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
119 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
122 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
124 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
126 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
128 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
130 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
132 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
136 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
138 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
140 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
142 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
144 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
146 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
148 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
150 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
152 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
154 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
156 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
160 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
162 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
166 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
168 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
170 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
173 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
174 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
180 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
182 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
183 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
184 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
186 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
188 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
189 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
190 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
191 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
192 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
193 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
194 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
195 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
197 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
198 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
200 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
202 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
203 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
206 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
210 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
211 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
212 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
213 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
214 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
215 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
216 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
217 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
218 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
219 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
220 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
221 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
222 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
223 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
224 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
225 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
226 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
227 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
228 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
229 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
230 };
231
232 /* GNU extension to record C++ vtable hierarchy. */
233 static reloc_howto_type elf64_s390_vtinherit_howto =
234 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
235 static reloc_howto_type elf64_s390_vtentry_howto =
236 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
237
238 static reloc_howto_type *
239 elf_s390_reloc_type_lookup (abfd, code)
240 bfd *abfd ATTRIBUTE_UNUSED;
241 bfd_reloc_code_real_type code;
242 {
243 switch (code)
244 {
245 case BFD_RELOC_NONE:
246 return &elf_howto_table[(int) R_390_NONE];
247 case BFD_RELOC_8:
248 return &elf_howto_table[(int) R_390_8];
249 case BFD_RELOC_390_12:
250 return &elf_howto_table[(int) R_390_12];
251 case BFD_RELOC_16:
252 return &elf_howto_table[(int) R_390_16];
253 case BFD_RELOC_32:
254 return &elf_howto_table[(int) R_390_32];
255 case BFD_RELOC_CTOR:
256 return &elf_howto_table[(int) R_390_32];
257 case BFD_RELOC_32_PCREL:
258 return &elf_howto_table[(int) R_390_PC32];
259 case BFD_RELOC_390_GOT12:
260 return &elf_howto_table[(int) R_390_GOT12];
261 case BFD_RELOC_32_GOT_PCREL:
262 return &elf_howto_table[(int) R_390_GOT32];
263 case BFD_RELOC_390_PLT32:
264 return &elf_howto_table[(int) R_390_PLT32];
265 case BFD_RELOC_390_COPY:
266 return &elf_howto_table[(int) R_390_COPY];
267 case BFD_RELOC_390_GLOB_DAT:
268 return &elf_howto_table[(int) R_390_GLOB_DAT];
269 case BFD_RELOC_390_JMP_SLOT:
270 return &elf_howto_table[(int) R_390_JMP_SLOT];
271 case BFD_RELOC_390_RELATIVE:
272 return &elf_howto_table[(int) R_390_RELATIVE];
273 case BFD_RELOC_32_GOTOFF:
274 return &elf_howto_table[(int) R_390_GOTOFF32];
275 case BFD_RELOC_390_GOTPC:
276 return &elf_howto_table[(int) R_390_GOTPC];
277 case BFD_RELOC_390_GOT16:
278 return &elf_howto_table[(int) R_390_GOT16];
279 case BFD_RELOC_16_PCREL:
280 return &elf_howto_table[(int) R_390_PC16];
281 case BFD_RELOC_390_PC16DBL:
282 return &elf_howto_table[(int) R_390_PC16DBL];
283 case BFD_RELOC_390_PLT16DBL:
284 return &elf_howto_table[(int) R_390_PLT16DBL];
285 case BFD_RELOC_390_PC32DBL:
286 return &elf_howto_table[(int) R_390_PC32DBL];
287 case BFD_RELOC_390_PLT32DBL:
288 return &elf_howto_table[(int) R_390_PLT32DBL];
289 case BFD_RELOC_390_GOTPCDBL:
290 return &elf_howto_table[(int) R_390_GOTPCDBL];
291 case BFD_RELOC_64:
292 return &elf_howto_table[(int) R_390_64];
293 case BFD_RELOC_64_PCREL:
294 return &elf_howto_table[(int) R_390_PC64];
295 case BFD_RELOC_390_GOT64:
296 return &elf_howto_table[(int) R_390_GOT64];
297 case BFD_RELOC_390_PLT64:
298 return &elf_howto_table[(int) R_390_PLT64];
299 case BFD_RELOC_390_GOTENT:
300 return &elf_howto_table[(int) R_390_GOTENT];
301 case BFD_RELOC_16_GOTOFF:
302 return &elf_howto_table[(int) R_390_GOTOFF16];
303 case BFD_RELOC_390_GOTOFF64:
304 return &elf_howto_table[(int) R_390_GOTOFF64];
305 case BFD_RELOC_390_GOTPLT12:
306 return &elf_howto_table[(int) R_390_GOTPLT12];
307 case BFD_RELOC_390_GOTPLT16:
308 return &elf_howto_table[(int) R_390_GOTPLT16];
309 case BFD_RELOC_390_GOTPLT32:
310 return &elf_howto_table[(int) R_390_GOTPLT32];
311 case BFD_RELOC_390_GOTPLT64:
312 return &elf_howto_table[(int) R_390_GOTPLT64];
313 case BFD_RELOC_390_GOTPLTENT:
314 return &elf_howto_table[(int) R_390_GOTPLTENT];
315 case BFD_RELOC_390_PLTOFF16:
316 return &elf_howto_table[(int) R_390_PLTOFF16];
317 case BFD_RELOC_390_PLTOFF32:
318 return &elf_howto_table[(int) R_390_PLTOFF32];
319 case BFD_RELOC_390_PLTOFF64:
320 return &elf_howto_table[(int) R_390_PLTOFF64];
321 case BFD_RELOC_390_TLS_LOAD:
322 return &elf_howto_table[(int) R_390_TLS_LOAD];
323 case BFD_RELOC_390_TLS_GDCALL:
324 return &elf_howto_table[(int) R_390_TLS_GDCALL];
325 case BFD_RELOC_390_TLS_LDCALL:
326 return &elf_howto_table[(int) R_390_TLS_LDCALL];
327 case BFD_RELOC_390_TLS_GD64:
328 return &elf_howto_table[(int) R_390_TLS_GD64];
329 case BFD_RELOC_390_TLS_GOTIE12:
330 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
331 case BFD_RELOC_390_TLS_GOTIE64:
332 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
333 case BFD_RELOC_390_TLS_LDM64:
334 return &elf_howto_table[(int) R_390_TLS_LDM64];
335 case BFD_RELOC_390_TLS_IE64:
336 return &elf_howto_table[(int) R_390_TLS_IE64];
337 case BFD_RELOC_390_TLS_IEENT:
338 return &elf_howto_table[(int) R_390_TLS_IEENT];
339 case BFD_RELOC_390_TLS_LE64:
340 return &elf_howto_table[(int) R_390_TLS_LE64];
341 case BFD_RELOC_390_TLS_LDO64:
342 return &elf_howto_table[(int) R_390_TLS_LDO64];
343 case BFD_RELOC_390_TLS_DTPMOD:
344 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
345 case BFD_RELOC_390_TLS_DTPOFF:
346 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
347 case BFD_RELOC_390_TLS_TPOFF:
348 return &elf_howto_table[(int) R_390_TLS_TPOFF];
349 case BFD_RELOC_390_20:
350 return &elf_howto_table[(int) R_390_20];
351 case BFD_RELOC_390_GOT20:
352 return &elf_howto_table[(int) R_390_GOT20];
353 case BFD_RELOC_390_GOTPLT20:
354 return &elf_howto_table[(int) R_390_GOTPLT20];
355 case BFD_RELOC_390_TLS_GOTIE20:
356 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
357 case BFD_RELOC_VTABLE_INHERIT:
358 return &elf64_s390_vtinherit_howto;
359 case BFD_RELOC_VTABLE_ENTRY:
360 return &elf64_s390_vtentry_howto;
361 default:
362 break;
363 }
364 return 0;
365 }
366
367 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
368 and elf64-s390.c has its own copy. */
369
370 static void
371 elf_s390_info_to_howto (abfd, cache_ptr, dst)
372 bfd *abfd ATTRIBUTE_UNUSED;
373 arelent *cache_ptr;
374 Elf_Internal_Rela *dst;
375 {
376 switch (ELF64_R_TYPE(dst->r_info))
377 {
378 case R_390_GNU_VTINHERIT:
379 cache_ptr->howto = &elf64_s390_vtinherit_howto;
380 break;
381
382 case R_390_GNU_VTENTRY:
383 cache_ptr->howto = &elf64_s390_vtentry_howto;
384 break;
385
386 default:
387 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
388 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
389 }
390 }
391
392 /* A relocation function which doesn't do anything. */
393 static bfd_reloc_status_type
394 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
395 output_bfd, error_message)
396 bfd *abfd ATTRIBUTE_UNUSED;
397 arelent *reloc_entry;
398 asymbol *symbol ATTRIBUTE_UNUSED;
399 PTR data ATTRIBUTE_UNUSED;
400 asection *input_section;
401 bfd *output_bfd;
402 char **error_message ATTRIBUTE_UNUSED;
403 {
404 if (output_bfd)
405 reloc_entry->address += input_section->output_offset;
406 return bfd_reloc_ok;
407 }
408
409 /* Handle the large displacement relocs. */
410 static bfd_reloc_status_type
411 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
412 output_bfd, error_message)
413 bfd *abfd;
414 arelent *reloc_entry;
415 asymbol *symbol;
416 PTR data;
417 asection *input_section;
418 bfd *output_bfd;
419 char **error_message ATTRIBUTE_UNUSED;
420 {
421 reloc_howto_type *howto = reloc_entry->howto;
422 bfd_vma relocation;
423 bfd_vma insn;
424
425 if (output_bfd != (bfd *) NULL
426 && (symbol->flags & BSF_SECTION_SYM) == 0
427 && (! howto->partial_inplace
428 || reloc_entry->addend == 0))
429 {
430 reloc_entry->address += input_section->output_offset;
431 return bfd_reloc_ok;
432 }
433 if (output_bfd != NULL)
434 return bfd_reloc_continue;
435
436 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
437 return bfd_reloc_outofrange;
438
439 relocation = (symbol->value
440 + symbol->section->output_section->vma
441 + symbol->section->output_offset);
442 relocation += reloc_entry->addend;
443 if (howto->pc_relative)
444 {
445 relocation -= (input_section->output_section->vma
446 + input_section->output_offset);
447 relocation -= reloc_entry->address;
448 }
449
450 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
451 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
452 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
453
454 if ((bfd_signed_vma) relocation < - 0x80000
455 || (bfd_signed_vma) relocation > 0x7ffff)
456 return bfd_reloc_overflow;
457 else
458 return bfd_reloc_ok;
459 }
460
461 static bfd_boolean
462 elf_s390_is_local_label_name (abfd, name)
463 bfd *abfd;
464 const char *name;
465 {
466 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
467 return TRUE;
468
469 return _bfd_elf_is_local_label_name (abfd, name);
470 }
471
472 /* Functions for the 390 ELF linker. */
473
474 /* The name of the dynamic interpreter. This is put in the .interp
475 section. */
476
477 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
478
479 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
480 copying dynamic variables from a shared lib into an app's dynbss
481 section, and instead use a dynamic relocation to point into the
482 shared lib. */
483 #define ELIMINATE_COPY_RELOCS 1
484
485 /* The size in bytes of the first entry in the procedure linkage table. */
486 #define PLT_FIRST_ENTRY_SIZE 32
487 /* The size in bytes of an entry in the procedure linkage table. */
488 #define PLT_ENTRY_SIZE 32
489
490 #define GOT_ENTRY_SIZE 8
491
492 /* The first three entries in a procedure linkage table are reserved,
493 and the initial contents are unimportant (we zero them out).
494 Subsequent entries look like this. See the SVR4 ABI 386
495 supplement to see how this works. */
496
497 /* For the s390, simple addr offset can only be 0 - 4096.
498 To use the full 16777216 TB address space, several instructions
499 are needed to load an address in a register and execute
500 a branch( or just saving the address)
501
502 Furthermore, only r 0 and 1 are free to use!!! */
503
504 /* The first 3 words in the GOT are then reserved.
505 Word 0 is the address of the dynamic table.
506 Word 1 is a pointer to a structure describing the object
507 Word 2 is used to point to the loader entry address.
508
509 The code for PLT entries looks like this:
510
511 The GOT holds the address in the PLT to be executed.
512 The loader then gets:
513 24(15) = Pointer to the structure describing the object.
514 28(15) = Offset in symbol table
515 The loader must then find the module where the function is
516 and insert the address in the GOT.
517
518 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
519 LG 1,0(1) # 6 bytes Load address from GOT in r1
520 BCR 15,1 # 2 bytes Jump to address
521 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
522 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
523 BRCL 15,-x # 6 bytes Jump to start of PLT
524 .long ? # 4 bytes offset into symbol table
525
526 Total = 32 bytes per PLT entry
527 Fixup at offset 2: relative address to GOT entry
528 Fixup at offset 22: relative branch to PLT0
529 Fixup at offset 28: 32 bit offset into symbol table
530
531 A 32 bit offset into the symbol table is enough. It allows for symbol
532 tables up to a size of 2 gigabyte. A single dynamic object (the main
533 program, any shared library) is limited to 4GB in size and I want to see
534 the program that manages to have a symbol table of more than 2 GB with a
535 total size of at max 4 GB. */
536
537 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
538 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
539 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
540 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
541 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
542 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
543 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
544 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
545
546 /* The first PLT entry pushes the offset into the symbol table
547 from R1 onto the stack at 8(15) and the loader object info
548 at 12(15), loads the loader address in R1 and jumps to it. */
549
550 /* The first entry in the PLT:
551
552 PLT0:
553 STG 1,56(15) # r1 contains the offset into the symbol table
554 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
555 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
556 LG 1,16(1) # get entry address of loader
557 BCR 15,1 # jump to loader
558
559 Fixup at offset 8: relative address to start of GOT. */
560
561 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
562 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
563 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
564 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
565 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
566 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
567 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
568 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
569
570 /* The s390 linker needs to keep track of the number of relocs that it
571 decides to copy as dynamic relocs in check_relocs for each symbol.
572 This is so that it can later discard them if they are found to be
573 unnecessary. We store the information in a field extending the
574 regular ELF linker hash table. */
575
576 struct elf_s390_dyn_relocs
577 {
578 struct elf_s390_dyn_relocs *next;
579
580 /* The input section of the reloc. */
581 asection *sec;
582
583 /* Total number of relocs copied for the input section. */
584 bfd_size_type count;
585
586 /* Number of pc-relative relocs copied for the input section. */
587 bfd_size_type pc_count;
588 };
589
590 /* s390 ELF linker hash entry. */
591
592 struct elf_s390_link_hash_entry
593 {
594 struct elf_link_hash_entry elf;
595
596 /* Track dynamic relocs copied for this symbol. */
597 struct elf_s390_dyn_relocs *dyn_relocs;
598
599 /* Number of GOTPLT references for a function. */
600 bfd_signed_vma gotplt_refcount;
601
602 #define GOT_UNKNOWN 0
603 #define GOT_NORMAL 1
604 #define GOT_TLS_GD 2
605 #define GOT_TLS_IE 3
606 #define GOT_TLS_IE_NLT 3
607 unsigned char tls_type;
608 };
609
610 #define elf_s390_hash_entry(ent) \
611 ((struct elf_s390_link_hash_entry *)(ent))
612
613 struct elf_s390_obj_tdata
614 {
615 struct elf_obj_tdata root;
616
617 /* tls_type for each local got entry. */
618 char *local_got_tls_type;
619 };
620
621 #define elf_s390_tdata(abfd) \
622 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
623
624 #define elf_s390_local_got_tls_type(abfd) \
625 (elf_s390_tdata (abfd)->local_got_tls_type)
626
627 static bfd_boolean
628 elf_s390_mkobject (abfd)
629 bfd *abfd;
630 {
631 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
632 abfd->tdata.any = bfd_zalloc (abfd, amt);
633 if (abfd->tdata.any == NULL)
634 return FALSE;
635 return TRUE;
636 }
637
638 static bfd_boolean
639 elf_s390_object_p (abfd)
640 bfd *abfd;
641 {
642 /* Set the right machine number for an s390 elf32 file. */
643 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
644 }
645
646 /* s390 ELF linker hash table. */
647
648 struct elf_s390_link_hash_table
649 {
650 struct elf_link_hash_table elf;
651
652 /* Short-cuts to get to dynamic linker sections. */
653 asection *sgot;
654 asection *sgotplt;
655 asection *srelgot;
656 asection *splt;
657 asection *srelplt;
658 asection *sdynbss;
659 asection *srelbss;
660
661 union {
662 bfd_signed_vma refcount;
663 bfd_vma offset;
664 } tls_ldm_got;
665
666 /* Small local sym to section mapping cache. */
667 struct sym_sec_cache sym_sec;
668 };
669
670 /* Get the s390 ELF linker hash table from a link_info structure. */
671
672 #define elf_s390_hash_table(p) \
673 ((struct elf_s390_link_hash_table *) ((p)->hash))
674
675 /* Create an entry in an s390 ELF linker hash table. */
676
677 static struct bfd_hash_entry *
678 link_hash_newfunc (entry, table, string)
679 struct bfd_hash_entry *entry;
680 struct bfd_hash_table *table;
681 const char *string;
682 {
683 /* Allocate the structure if it has not already been allocated by a
684 subclass. */
685 if (entry == NULL)
686 {
687 entry = bfd_hash_allocate (table,
688 sizeof (struct elf_s390_link_hash_entry));
689 if (entry == NULL)
690 return entry;
691 }
692
693 /* Call the allocation method of the superclass. */
694 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
695 if (entry != NULL)
696 {
697 struct elf_s390_link_hash_entry *eh;
698
699 eh = (struct elf_s390_link_hash_entry *) entry;
700 eh->dyn_relocs = NULL;
701 eh->gotplt_refcount = 0;
702 eh->tls_type = GOT_UNKNOWN;
703 }
704
705 return entry;
706 }
707
708 /* Create an s390 ELF linker hash table. */
709
710 static struct bfd_link_hash_table *
711 elf_s390_link_hash_table_create (abfd)
712 bfd *abfd;
713 {
714 struct elf_s390_link_hash_table *ret;
715 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
716
717 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
718 if (ret == NULL)
719 return NULL;
720
721 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
722 {
723 free (ret);
724 return NULL;
725 }
726
727 ret->sgot = NULL;
728 ret->sgotplt = NULL;
729 ret->srelgot = NULL;
730 ret->splt = NULL;
731 ret->srelplt = NULL;
732 ret->sdynbss = NULL;
733 ret->srelbss = NULL;
734 ret->tls_ldm_got.refcount = 0;
735 ret->sym_sec.abfd = NULL;
736
737 return &ret->elf.root;
738 }
739
740 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
741 shortcuts to them in our hash table. */
742
743 static bfd_boolean
744 create_got_section (dynobj, info)
745 bfd *dynobj;
746 struct bfd_link_info *info;
747 {
748 struct elf_s390_link_hash_table *htab;
749
750 if (! _bfd_elf_create_got_section (dynobj, info))
751 return FALSE;
752
753 htab = elf_s390_hash_table (info);
754 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
755 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
756 if (!htab->sgot || !htab->sgotplt)
757 abort ();
758
759 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
760 if (htab->srelgot == NULL
761 || ! bfd_set_section_flags (dynobj, htab->srelgot,
762 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
763 | SEC_IN_MEMORY | SEC_LINKER_CREATED
764 | SEC_READONLY))
765 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
766 return FALSE;
767 return TRUE;
768 }
769
770 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
771 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
772 hash table. */
773
774 static bfd_boolean
775 elf_s390_create_dynamic_sections (dynobj, info)
776 bfd *dynobj;
777 struct bfd_link_info *info;
778 {
779 struct elf_s390_link_hash_table *htab;
780
781 htab = elf_s390_hash_table (info);
782 if (!htab->sgot && !create_got_section (dynobj, info))
783 return FALSE;
784
785 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
786 return FALSE;
787
788 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
789 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
790 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
791 if (!info->shared)
792 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
793
794 if (!htab->splt || !htab->srelplt || !htab->sdynbss
795 || (!info->shared && !htab->srelbss))
796 abort ();
797
798 return TRUE;
799 }
800
801 /* Copy the extra info we tack onto an elf_link_hash_entry. */
802
803 static void
804 elf_s390_copy_indirect_symbol (bed, dir, ind)
805 const struct elf_backend_data *bed;
806 struct elf_link_hash_entry *dir, *ind;
807 {
808 struct elf_s390_link_hash_entry *edir, *eind;
809
810 edir = (struct elf_s390_link_hash_entry *) dir;
811 eind = (struct elf_s390_link_hash_entry *) ind;
812
813 if (eind->dyn_relocs != NULL)
814 {
815 if (edir->dyn_relocs != NULL)
816 {
817 struct elf_s390_dyn_relocs **pp;
818 struct elf_s390_dyn_relocs *p;
819
820 if (ind->root.type == bfd_link_hash_indirect)
821 abort ();
822
823 /* Add reloc counts against the weak sym to the strong sym
824 list. Merge any entries against the same section. */
825 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
826 {
827 struct elf_s390_dyn_relocs *q;
828
829 for (q = edir->dyn_relocs; q != NULL; q = q->next)
830 if (q->sec == p->sec)
831 {
832 q->pc_count += p->pc_count;
833 q->count += p->count;
834 *pp = p->next;
835 break;
836 }
837 if (q == NULL)
838 pp = &p->next;
839 }
840 *pp = edir->dyn_relocs;
841 }
842
843 edir->dyn_relocs = eind->dyn_relocs;
844 eind->dyn_relocs = NULL;
845 }
846
847 if (ind->root.type == bfd_link_hash_indirect
848 && dir->got.refcount <= 0)
849 {
850 edir->tls_type = eind->tls_type;
851 eind->tls_type = GOT_UNKNOWN;
852 }
853
854 if (ELIMINATE_COPY_RELOCS
855 && ind->root.type != bfd_link_hash_indirect
856 && dir->dynamic_adjusted)
857 {
858 /* If called to transfer flags for a weakdef during processing
859 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
860 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
861 dir->ref_dynamic |= ind->ref_dynamic;
862 dir->ref_regular |= ind->ref_regular;
863 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
864 dir->needs_plt |= ind->needs_plt;
865 }
866 else
867 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
868 }
869
870 static int
871 elf_s390_tls_transition (info, r_type, is_local)
872 struct bfd_link_info *info;
873 int r_type;
874 int is_local;
875 {
876 if (info->shared)
877 return r_type;
878
879 switch (r_type)
880 {
881 case R_390_TLS_GD64:
882 case R_390_TLS_IE64:
883 if (is_local)
884 return R_390_TLS_LE64;
885 return R_390_TLS_IE64;
886 case R_390_TLS_GOTIE64:
887 if (is_local)
888 return R_390_TLS_LE64;
889 return R_390_TLS_GOTIE64;
890 case R_390_TLS_LDM64:
891 return R_390_TLS_LE64;
892 }
893
894 return r_type;
895 }
896
897 /* Look through the relocs for a section during the first phase, and
898 allocate space in the global offset table or procedure linkage
899 table. */
900
901 static bfd_boolean
902 elf_s390_check_relocs (abfd, info, sec, relocs)
903 bfd *abfd;
904 struct bfd_link_info *info;
905 asection *sec;
906 const Elf_Internal_Rela *relocs;
907 {
908 struct elf_s390_link_hash_table *htab;
909 Elf_Internal_Shdr *symtab_hdr;
910 struct elf_link_hash_entry **sym_hashes;
911 const Elf_Internal_Rela *rel;
912 const Elf_Internal_Rela *rel_end;
913 asection *sreloc;
914 bfd_signed_vma *local_got_refcounts;
915 int tls_type, old_tls_type;
916
917 if (info->relocatable)
918 return TRUE;
919
920 htab = elf_s390_hash_table (info);
921 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
922 sym_hashes = elf_sym_hashes (abfd);
923 local_got_refcounts = elf_local_got_refcounts (abfd);
924
925 sreloc = NULL;
926
927 rel_end = relocs + sec->reloc_count;
928 for (rel = relocs; rel < rel_end; rel++)
929 {
930 unsigned int r_type;
931 unsigned long r_symndx;
932 struct elf_link_hash_entry *h;
933
934 r_symndx = ELF64_R_SYM (rel->r_info);
935
936 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
937 {
938 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
939 abfd,
940 r_symndx);
941 return FALSE;
942 }
943
944 if (r_symndx < symtab_hdr->sh_info)
945 h = NULL;
946 else
947 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
948
949 /* Create got section and local_got_refcounts array if they
950 are needed. */
951 r_type = elf_s390_tls_transition (info,
952 ELF64_R_TYPE (rel->r_info),
953 h == NULL);
954 switch (r_type)
955 {
956 case R_390_GOT12:
957 case R_390_GOT16:
958 case R_390_GOT20:
959 case R_390_GOT32:
960 case R_390_GOT64:
961 case R_390_GOTENT:
962 case R_390_GOTPLT12:
963 case R_390_GOTPLT16:
964 case R_390_GOTPLT20:
965 case R_390_GOTPLT32:
966 case R_390_GOTPLT64:
967 case R_390_GOTPLTENT:
968 case R_390_TLS_GD64:
969 case R_390_TLS_GOTIE12:
970 case R_390_TLS_GOTIE20:
971 case R_390_TLS_GOTIE64:
972 case R_390_TLS_IEENT:
973 case R_390_TLS_IE64:
974 case R_390_TLS_LDM64:
975 if (h == NULL
976 && local_got_refcounts == NULL)
977 {
978 bfd_size_type size;
979
980 size = symtab_hdr->sh_info;
981 size *= (sizeof (bfd_signed_vma) + sizeof(char));
982 local_got_refcounts = ((bfd_signed_vma *)
983 bfd_zalloc (abfd, size));
984 if (local_got_refcounts == NULL)
985 return FALSE;
986 elf_local_got_refcounts (abfd) = local_got_refcounts;
987 elf_s390_local_got_tls_type (abfd)
988 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
989 }
990 /* Fall through. */
991 case R_390_GOTOFF16:
992 case R_390_GOTOFF32:
993 case R_390_GOTOFF64:
994 case R_390_GOTPC:
995 case R_390_GOTPCDBL:
996 if (htab->sgot == NULL)
997 {
998 if (htab->elf.dynobj == NULL)
999 htab->elf.dynobj = abfd;
1000 if (!create_got_section (htab->elf.dynobj, info))
1001 return FALSE;
1002 }
1003 }
1004
1005 switch (r_type)
1006 {
1007 case R_390_GOTOFF16:
1008 case R_390_GOTOFF32:
1009 case R_390_GOTOFF64:
1010 case R_390_GOTPC:
1011 case R_390_GOTPCDBL:
1012 /* Got is created, nothing to be done. */
1013 break;
1014
1015 case R_390_PLT16DBL:
1016 case R_390_PLT32:
1017 case R_390_PLT32DBL:
1018 case R_390_PLT64:
1019 case R_390_PLTOFF16:
1020 case R_390_PLTOFF32:
1021 case R_390_PLTOFF64:
1022 /* This symbol requires a procedure linkage table entry. We
1023 actually build the entry in adjust_dynamic_symbol,
1024 because this might be a case of linking PIC code which is
1025 never referenced by a dynamic object, in which case we
1026 don't need to generate a procedure linkage table entry
1027 after all. */
1028
1029 /* If this is a local symbol, we resolve it directly without
1030 creating a procedure linkage table entry. */
1031 if (h != NULL)
1032 {
1033 h->needs_plt = 1;
1034 h->plt.refcount += 1;
1035 }
1036 break;
1037
1038 case R_390_GOTPLT12:
1039 case R_390_GOTPLT16:
1040 case R_390_GOTPLT20:
1041 case R_390_GOTPLT32:
1042 case R_390_GOTPLT64:
1043 case R_390_GOTPLTENT:
1044 /* This symbol requires either a procedure linkage table entry
1045 or an entry in the local got. We actually build the entry
1046 in adjust_dynamic_symbol because whether this is really a
1047 global reference can change and with it the fact if we have
1048 to create a plt entry or a local got entry. To be able to
1049 make a once global symbol a local one we have to keep track
1050 of the number of gotplt references that exist for this
1051 symbol. */
1052 if (h != NULL)
1053 {
1054 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1055 h->needs_plt = 1;
1056 h->plt.refcount += 1;
1057 }
1058 else
1059 local_got_refcounts[r_symndx] += 1;
1060 break;
1061
1062 case R_390_TLS_LDM64:
1063 htab->tls_ldm_got.refcount += 1;
1064 break;
1065
1066 case R_390_TLS_IE64:
1067 case R_390_TLS_GOTIE12:
1068 case R_390_TLS_GOTIE20:
1069 case R_390_TLS_GOTIE64:
1070 case R_390_TLS_IEENT:
1071 if (info->shared)
1072 info->flags |= DF_STATIC_TLS;
1073 /* Fall through */
1074
1075 case R_390_GOT12:
1076 case R_390_GOT16:
1077 case R_390_GOT20:
1078 case R_390_GOT32:
1079 case R_390_GOT64:
1080 case R_390_GOTENT:
1081 case R_390_TLS_GD64:
1082 /* This symbol requires a global offset table entry. */
1083 switch (r_type)
1084 {
1085 default:
1086 case R_390_GOT12:
1087 case R_390_GOT16:
1088 case R_390_GOT20:
1089 case R_390_GOT32:
1090 case R_390_GOTENT:
1091 tls_type = GOT_NORMAL;
1092 break;
1093 case R_390_TLS_GD64:
1094 tls_type = GOT_TLS_GD;
1095 break;
1096 case R_390_TLS_IE64:
1097 case R_390_TLS_GOTIE64:
1098 tls_type = GOT_TLS_IE;
1099 break;
1100 case R_390_TLS_GOTIE12:
1101 case R_390_TLS_GOTIE20:
1102 case R_390_TLS_IEENT:
1103 tls_type = GOT_TLS_IE_NLT;
1104 break;
1105 }
1106
1107 if (h != NULL)
1108 {
1109 h->got.refcount += 1;
1110 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1111 }
1112 else
1113 {
1114 local_got_refcounts[r_symndx] += 1;
1115 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1116 }
1117 /* If a TLS symbol is accessed using IE at least once,
1118 there is no point to use dynamic model for it. */
1119 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1120 {
1121 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1122 {
1123 (*_bfd_error_handler)
1124 (_("%B: `%s' accessed both as normal and thread local symbol"),
1125 abfd, h->root.root.string);
1126 return FALSE;
1127 }
1128 if (old_tls_type > tls_type)
1129 tls_type = old_tls_type;
1130 }
1131
1132 if (old_tls_type != tls_type)
1133 {
1134 if (h != NULL)
1135 elf_s390_hash_entry (h)->tls_type = tls_type;
1136 else
1137 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1138 }
1139
1140 if (r_type != R_390_TLS_IE64)
1141 break;
1142 /* Fall through */
1143
1144 case R_390_TLS_LE64:
1145 if (!info->shared)
1146 break;
1147 info->flags |= DF_STATIC_TLS;
1148 /* Fall through */
1149
1150 case R_390_8:
1151 case R_390_16:
1152 case R_390_32:
1153 case R_390_64:
1154 case R_390_PC16:
1155 case R_390_PC16DBL:
1156 case R_390_PC32:
1157 case R_390_PC32DBL:
1158 case R_390_PC64:
1159 if (h != NULL && !info->shared)
1160 {
1161 /* If this reloc is in a read-only section, we might
1162 need a copy reloc. We can't check reliably at this
1163 stage whether the section is read-only, as input
1164 sections have not yet been mapped to output sections.
1165 Tentatively set the flag for now, and correct in
1166 adjust_dynamic_symbol. */
1167 h->non_got_ref = 1;
1168
1169 /* We may need a .plt entry if the function this reloc
1170 refers to is in a shared lib. */
1171 h->plt.refcount += 1;
1172 }
1173
1174 /* If we are creating a shared library, and this is a reloc
1175 against a global symbol, or a non PC relative reloc
1176 against a local symbol, then we need to copy the reloc
1177 into the shared library. However, if we are linking with
1178 -Bsymbolic, we do not need to copy a reloc against a
1179 global symbol which is defined in an object we are
1180 including in the link (i.e., DEF_REGULAR is set). At
1181 this point we have not seen all the input files, so it is
1182 possible that DEF_REGULAR is not set now but will be set
1183 later (it is never cleared). In case of a weak definition,
1184 DEF_REGULAR may be cleared later by a strong definition in
1185 a shared library. We account for that possibility below by
1186 storing information in the relocs_copied field of the hash
1187 table entry. A similar situation occurs when creating
1188 shared libraries and symbol visibility changes render the
1189 symbol local.
1190
1191 If on the other hand, we are creating an executable, we
1192 may need to keep relocations for symbols satisfied by a
1193 dynamic library if we manage to avoid copy relocs for the
1194 symbol. */
1195 if ((info->shared
1196 && (sec->flags & SEC_ALLOC) != 0
1197 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1198 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1199 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1200 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1201 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1202 || (h != NULL
1203 && (! info->symbolic
1204 || h->root.type == bfd_link_hash_defweak
1205 || !h->def_regular))))
1206 || (ELIMINATE_COPY_RELOCS
1207 && !info->shared
1208 && (sec->flags & SEC_ALLOC) != 0
1209 && h != NULL
1210 && (h->root.type == bfd_link_hash_defweak
1211 || !h->def_regular)))
1212 {
1213 struct elf_s390_dyn_relocs *p;
1214 struct elf_s390_dyn_relocs **head;
1215
1216 /* We must copy these reloc types into the output file.
1217 Create a reloc section in dynobj and make room for
1218 this reloc. */
1219 if (sreloc == NULL)
1220 {
1221 const char *name;
1222 bfd *dynobj;
1223
1224 name = (bfd_elf_string_from_elf_section
1225 (abfd,
1226 elf_elfheader (abfd)->e_shstrndx,
1227 elf_section_data (sec)->rel_hdr.sh_name));
1228 if (name == NULL)
1229 return FALSE;
1230
1231 if (strncmp (name, ".rela", 5) != 0
1232 || strcmp (bfd_get_section_name (abfd, sec),
1233 name + 5) != 0)
1234 {
1235 (*_bfd_error_handler)
1236 (_("%B: bad relocation section name `%s\'"),
1237 abfd, name);
1238 }
1239
1240 if (htab->elf.dynobj == NULL)
1241 htab->elf.dynobj = abfd;
1242
1243 dynobj = htab->elf.dynobj;
1244 sreloc = bfd_get_section_by_name (dynobj, name);
1245 if (sreloc == NULL)
1246 {
1247 flagword flags;
1248
1249 sreloc = bfd_make_section (dynobj, name);
1250 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1251 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1252 if ((sec->flags & SEC_ALLOC) != 0)
1253 flags |= SEC_ALLOC | SEC_LOAD;
1254 if (sreloc == NULL
1255 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1256 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1257 return FALSE;
1258 }
1259 elf_section_data (sec)->sreloc = sreloc;
1260 }
1261
1262 /* If this is a global symbol, we count the number of
1263 relocations we need for this symbol. */
1264 if (h != NULL)
1265 {
1266 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1267 }
1268 else
1269 {
1270 /* Track dynamic relocs needed for local syms too.
1271 We really need local syms available to do this
1272 easily. Oh well. */
1273
1274 asection *s;
1275 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1276 sec, r_symndx);
1277 if (s == NULL)
1278 return FALSE;
1279
1280 head = ((struct elf_s390_dyn_relocs **)
1281 &elf_section_data (s)->local_dynrel);
1282 }
1283
1284 p = *head;
1285 if (p == NULL || p->sec != sec)
1286 {
1287 bfd_size_type amt = sizeof *p;
1288 p = ((struct elf_s390_dyn_relocs *)
1289 bfd_alloc (htab->elf.dynobj, amt));
1290 if (p == NULL)
1291 return FALSE;
1292 p->next = *head;
1293 *head = p;
1294 p->sec = sec;
1295 p->count = 0;
1296 p->pc_count = 0;
1297 }
1298
1299 p->count += 1;
1300 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1301 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1302 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1303 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1304 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1305 p->pc_count += 1;
1306 }
1307 break;
1308
1309 /* This relocation describes the C++ object vtable hierarchy.
1310 Reconstruct it for later use during GC. */
1311 case R_390_GNU_VTINHERIT:
1312 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1313 return FALSE;
1314 break;
1315
1316 /* This relocation describes which C++ vtable entries are actually
1317 used. Record for later use during GC. */
1318 case R_390_GNU_VTENTRY:
1319 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1320 return FALSE;
1321 break;
1322
1323 default:
1324 break;
1325 }
1326 }
1327
1328 return TRUE;
1329 }
1330
1331 /* Return the section that should be marked against GC for a given
1332 relocation. */
1333
1334 static asection *
1335 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1336 asection *sec;
1337 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1338 Elf_Internal_Rela *rel;
1339 struct elf_link_hash_entry *h;
1340 Elf_Internal_Sym *sym;
1341 {
1342 if (h != NULL)
1343 {
1344 switch (ELF64_R_TYPE (rel->r_info))
1345 {
1346 case R_390_GNU_VTINHERIT:
1347 case R_390_GNU_VTENTRY:
1348 break;
1349
1350 default:
1351 switch (h->root.type)
1352 {
1353 case bfd_link_hash_defined:
1354 case bfd_link_hash_defweak:
1355 return h->root.u.def.section;
1356
1357 case bfd_link_hash_common:
1358 return h->root.u.c.p->section;
1359
1360 default:
1361 break;
1362 }
1363 }
1364 }
1365 else
1366 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1367
1368 return NULL;
1369 }
1370
1371 /* Update the got entry reference counts for the section being removed. */
1372
1373 static bfd_boolean
1374 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1375 bfd *abfd;
1376 struct bfd_link_info *info;
1377 asection *sec;
1378 const Elf_Internal_Rela *relocs;
1379 {
1380 Elf_Internal_Shdr *symtab_hdr;
1381 struct elf_link_hash_entry **sym_hashes;
1382 bfd_signed_vma *local_got_refcounts;
1383 const Elf_Internal_Rela *rel, *relend;
1384
1385 elf_section_data (sec)->local_dynrel = NULL;
1386
1387 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1388 sym_hashes = elf_sym_hashes (abfd);
1389 local_got_refcounts = elf_local_got_refcounts (abfd);
1390
1391 relend = relocs + sec->reloc_count;
1392 for (rel = relocs; rel < relend; rel++)
1393 {
1394 unsigned long r_symndx;
1395 unsigned int r_type;
1396 struct elf_link_hash_entry *h = NULL;
1397
1398 r_symndx = ELF64_R_SYM (rel->r_info);
1399 if (r_symndx >= symtab_hdr->sh_info)
1400 {
1401 struct elf_s390_link_hash_entry *eh;
1402 struct elf_s390_dyn_relocs **pp;
1403 struct elf_s390_dyn_relocs *p;
1404
1405 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1406 while (h->root.type == bfd_link_hash_indirect
1407 || h->root.type == bfd_link_hash_warning)
1408 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1409 eh = (struct elf_s390_link_hash_entry *) h;
1410
1411 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1412 if (p->sec == sec)
1413 {
1414 /* Everything must go for SEC. */
1415 *pp = p->next;
1416 break;
1417 }
1418 }
1419
1420 r_type = ELF64_R_TYPE (rel->r_info);
1421 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1422 switch (r_type)
1423 {
1424 case R_390_TLS_LDM64:
1425 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1426 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1427 break;
1428
1429 case R_390_TLS_GD64:
1430 case R_390_TLS_IE64:
1431 case R_390_TLS_GOTIE12:
1432 case R_390_TLS_GOTIE20:
1433 case R_390_TLS_GOTIE64:
1434 case R_390_TLS_IEENT:
1435 case R_390_GOT12:
1436 case R_390_GOT16:
1437 case R_390_GOT20:
1438 case R_390_GOT32:
1439 case R_390_GOT64:
1440 case R_390_GOTOFF16:
1441 case R_390_GOTOFF32:
1442 case R_390_GOTOFF64:
1443 case R_390_GOTPC:
1444 case R_390_GOTPCDBL:
1445 case R_390_GOTENT:
1446 if (h != NULL)
1447 {
1448 if (h->got.refcount > 0)
1449 h->got.refcount -= 1;
1450 }
1451 else if (local_got_refcounts != NULL)
1452 {
1453 if (local_got_refcounts[r_symndx] > 0)
1454 local_got_refcounts[r_symndx] -= 1;
1455 }
1456 break;
1457
1458 case R_390_8:
1459 case R_390_12:
1460 case R_390_16:
1461 case R_390_20:
1462 case R_390_32:
1463 case R_390_64:
1464 case R_390_PC16:
1465 case R_390_PC16DBL:
1466 case R_390_PC32:
1467 case R_390_PC32DBL:
1468 case R_390_PC64:
1469 if (info->shared)
1470 break;
1471 /* Fall through */
1472
1473 case R_390_PLT16DBL:
1474 case R_390_PLT32:
1475 case R_390_PLT32DBL:
1476 case R_390_PLT64:
1477 case R_390_PLTOFF16:
1478 case R_390_PLTOFF32:
1479 case R_390_PLTOFF64:
1480 if (h != NULL)
1481 {
1482 if (h->plt.refcount > 0)
1483 h->plt.refcount -= 1;
1484 }
1485 break;
1486
1487 case R_390_GOTPLT12:
1488 case R_390_GOTPLT16:
1489 case R_390_GOTPLT20:
1490 case R_390_GOTPLT32:
1491 case R_390_GOTPLT64:
1492 case R_390_GOTPLTENT:
1493 if (h != NULL)
1494 {
1495 if (h->plt.refcount > 0)
1496 {
1497 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1498 h->plt.refcount -= 1;
1499 }
1500 }
1501 else if (local_got_refcounts != NULL)
1502 {
1503 if (local_got_refcounts[r_symndx] > 0)
1504 local_got_refcounts[r_symndx] -= 1;
1505 }
1506 break;
1507
1508 default:
1509 break;
1510 }
1511 }
1512
1513 return TRUE;
1514 }
1515
1516 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1517 entry but we found we will not create any. Called when we find we will
1518 not have any PLT for this symbol, by for example
1519 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1520 or elf_s390_size_dynamic_sections if no dynamic sections will be
1521 created (we're only linking static objects). */
1522
1523 static void
1524 elf_s390_adjust_gotplt (h)
1525 struct elf_s390_link_hash_entry *h;
1526 {
1527 if (h->elf.root.type == bfd_link_hash_warning)
1528 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1529
1530 if (h->gotplt_refcount <= 0)
1531 return;
1532
1533 /* We simply add the number of gotplt references to the number
1534 * of got references for this symbol. */
1535 h->elf.got.refcount += h->gotplt_refcount;
1536 h->gotplt_refcount = -1;
1537 }
1538
1539 /* Adjust a symbol defined by a dynamic object and referenced by a
1540 regular object. The current definition is in some section of the
1541 dynamic object, but we're not including those sections. We have to
1542 change the definition to something the rest of the link can
1543 understand. */
1544
1545 static bfd_boolean
1546 elf_s390_adjust_dynamic_symbol (info, h)
1547 struct bfd_link_info *info;
1548 struct elf_link_hash_entry *h;
1549 {
1550 struct elf_s390_link_hash_table *htab;
1551 asection *s;
1552 unsigned int power_of_two;
1553
1554 /* If this is a function, put it in the procedure linkage table. We
1555 will fill in the contents of the procedure linkage table later
1556 (although we could actually do it here). */
1557 if (h->type == STT_FUNC
1558 || h->needs_plt)
1559 {
1560 if (h->plt.refcount <= 0
1561 || (! info->shared
1562 && !h->def_dynamic
1563 && !h->ref_dynamic
1564 && h->root.type != bfd_link_hash_undefweak
1565 && h->root.type != bfd_link_hash_undefined))
1566 {
1567 /* This case can occur if we saw a PLT32 reloc in an input
1568 file, but the symbol was never referred to by a dynamic
1569 object, or if all references were garbage collected. In
1570 such a case, we don't actually need to build a procedure
1571 linkage table, and we can just do a PC32 reloc instead. */
1572 h->plt.offset = (bfd_vma) -1;
1573 h->needs_plt = 0;
1574 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1575 }
1576
1577 return TRUE;
1578 }
1579 else
1580 /* It's possible that we incorrectly decided a .plt reloc was
1581 needed for an R_390_PC32 reloc to a non-function sym in
1582 check_relocs. We can't decide accurately between function and
1583 non-function syms in check-relocs; Objects loaded later in
1584 the link may change h->type. So fix it now. */
1585 h->plt.offset = (bfd_vma) -1;
1586
1587 /* If this is a weak symbol, and there is a real definition, the
1588 processor independent code will have arranged for us to see the
1589 real definition first, and we can just use the same value. */
1590 if (h->u.weakdef != NULL)
1591 {
1592 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1593 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1594 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1595 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1596 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1597 h->non_got_ref = h->u.weakdef->non_got_ref;
1598 return TRUE;
1599 }
1600
1601 /* This is a reference to a symbol defined by a dynamic object which
1602 is not a function. */
1603
1604 /* If we are creating a shared library, we must presume that the
1605 only references to the symbol are via the global offset table.
1606 For such cases we need not do anything here; the relocations will
1607 be handled correctly by relocate_section. */
1608 if (info->shared)
1609 return TRUE;
1610
1611 /* If there are no references to this symbol that do not use the
1612 GOT, we don't need to generate a copy reloc. */
1613 if (!h->non_got_ref)
1614 return TRUE;
1615
1616 /* If -z nocopyreloc was given, we won't generate them either. */
1617 if (info->nocopyreloc)
1618 {
1619 h->non_got_ref = 0;
1620 return TRUE;
1621 }
1622
1623 if (ELIMINATE_COPY_RELOCS)
1624 {
1625 struct elf_s390_link_hash_entry * eh;
1626 struct elf_s390_dyn_relocs *p;
1627
1628 eh = (struct elf_s390_link_hash_entry *) h;
1629 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1630 {
1631 s = p->sec->output_section;
1632 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1633 break;
1634 }
1635
1636 /* If we didn't find any dynamic relocs in read-only sections, then
1637 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1638 if (p == NULL)
1639 {
1640 h->non_got_ref = 0;
1641 return TRUE;
1642 }
1643 }
1644
1645 /* We must allocate the symbol in our .dynbss section, which will
1646 become part of the .bss section of the executable. There will be
1647 an entry for this symbol in the .dynsym section. The dynamic
1648 object will contain position independent code, so all references
1649 from the dynamic object to this symbol will go through the global
1650 offset table. The dynamic linker will use the .dynsym entry to
1651 determine the address it must put in the global offset table, so
1652 both the dynamic object and the regular object will refer to the
1653 same memory location for the variable. */
1654
1655 htab = elf_s390_hash_table (info);
1656
1657 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1658 copy the initial value out of the dynamic object and into the
1659 runtime process image. */
1660 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1661 {
1662 htab->srelbss->size += sizeof (Elf64_External_Rela);
1663 h->needs_copy = 1;
1664 }
1665
1666 /* We need to figure out the alignment required for this symbol. I
1667 have no idea how ELF linkers handle this. */
1668 power_of_two = bfd_log2 (h->size);
1669 if (power_of_two > 3)
1670 power_of_two = 3;
1671
1672 /* Apply the required alignment. */
1673 s = htab->sdynbss;
1674 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1675 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1676 {
1677 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1678 return FALSE;
1679 }
1680
1681 /* Define the symbol as being at this point in the section. */
1682 h->root.u.def.section = s;
1683 h->root.u.def.value = s->size;
1684
1685 /* Increment the section size to make room for the symbol. */
1686 s->size += h->size;
1687
1688 return TRUE;
1689 }
1690
1691 /* Allocate space in .plt, .got and associated reloc sections for
1692 dynamic relocs. */
1693
1694 static bfd_boolean
1695 allocate_dynrelocs (h, inf)
1696 struct elf_link_hash_entry *h;
1697 PTR inf;
1698 {
1699 struct bfd_link_info *info;
1700 struct elf_s390_link_hash_table *htab;
1701 struct elf_s390_link_hash_entry *eh;
1702 struct elf_s390_dyn_relocs *p;
1703
1704 if (h->root.type == bfd_link_hash_indirect)
1705 return TRUE;
1706
1707 if (h->root.type == bfd_link_hash_warning)
1708 /* When warning symbols are created, they **replace** the "real"
1709 entry in the hash table, thus we never get to see the real
1710 symbol in a hash traversal. So look at it now. */
1711 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1712
1713 info = (struct bfd_link_info *) inf;
1714 htab = elf_s390_hash_table (info);
1715
1716 if (htab->elf.dynamic_sections_created
1717 && h->plt.refcount > 0
1718 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1719 || h->root.type != bfd_link_hash_undefweak))
1720 {
1721 /* Make sure this symbol is output as a dynamic symbol.
1722 Undefined weak syms won't yet be marked as dynamic. */
1723 if (h->dynindx == -1
1724 && !h->forced_local)
1725 {
1726 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1727 return FALSE;
1728 }
1729
1730 if (info->shared
1731 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1732 {
1733 asection *s = htab->splt;
1734
1735 /* If this is the first .plt entry, make room for the special
1736 first entry. */
1737 if (s->size == 0)
1738 s->size += PLT_FIRST_ENTRY_SIZE;
1739
1740 h->plt.offset = s->size;
1741
1742 /* If this symbol is not defined in a regular file, and we are
1743 not generating a shared library, then set the symbol to this
1744 location in the .plt. This is required to make function
1745 pointers compare as equal between the normal executable and
1746 the shared library. */
1747 if (! info->shared
1748 && !h->def_regular)
1749 {
1750 h->root.u.def.section = s;
1751 h->root.u.def.value = h->plt.offset;
1752 }
1753
1754 /* Make room for this entry. */
1755 s->size += PLT_ENTRY_SIZE;
1756
1757 /* We also need to make an entry in the .got.plt section, which
1758 will be placed in the .got section by the linker script. */
1759 htab->sgotplt->size += GOT_ENTRY_SIZE;
1760
1761 /* We also need to make an entry in the .rela.plt section. */
1762 htab->srelplt->size += sizeof (Elf64_External_Rela);
1763 }
1764 else
1765 {
1766 h->plt.offset = (bfd_vma) -1;
1767 h->needs_plt = 0;
1768 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1769 }
1770 }
1771 else
1772 {
1773 h->plt.offset = (bfd_vma) -1;
1774 h->needs_plt = 0;
1775 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1776 }
1777
1778 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1779 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1780 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1781 we can save the dynamic TLS relocation. */
1782 if (h->got.refcount > 0
1783 && !info->shared
1784 && h->dynindx == -1
1785 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1786 {
1787 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1788 /* For the GOTIE access without a literal pool entry the offset has
1789 to be stored somewhere. The immediate value in the instruction
1790 is not bit enough so the value is stored in the got. */
1791 {
1792 h->got.offset = htab->sgot->size;
1793 htab->sgot->size += GOT_ENTRY_SIZE;
1794 }
1795 else
1796 h->got.offset = (bfd_vma) -1;
1797 }
1798 else if (h->got.refcount > 0)
1799 {
1800 asection *s;
1801 bfd_boolean dyn;
1802 int tls_type = elf_s390_hash_entry(h)->tls_type;
1803
1804 /* Make sure this symbol is output as a dynamic symbol.
1805 Undefined weak syms won't yet be marked as dynamic. */
1806 if (h->dynindx == -1
1807 && !h->forced_local)
1808 {
1809 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1810 return FALSE;
1811 }
1812
1813 s = htab->sgot;
1814 h->got.offset = s->size;
1815 s->size += GOT_ENTRY_SIZE;
1816 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1817 if (tls_type == GOT_TLS_GD)
1818 s->size += GOT_ENTRY_SIZE;
1819 dyn = htab->elf.dynamic_sections_created;
1820 /* R_390_TLS_IE64 needs one dynamic relocation,
1821 R_390_TLS_GD64 needs one if local symbol and two if global. */
1822 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1823 || tls_type >= GOT_TLS_IE)
1824 htab->srelgot->size += sizeof (Elf64_External_Rela);
1825 else if (tls_type == GOT_TLS_GD)
1826 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1827 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1828 || h->root.type != bfd_link_hash_undefweak)
1829 && (info->shared
1830 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1831 htab->srelgot->size += sizeof (Elf64_External_Rela);
1832 }
1833 else
1834 h->got.offset = (bfd_vma) -1;
1835
1836 eh = (struct elf_s390_link_hash_entry *) h;
1837 if (eh->dyn_relocs == NULL)
1838 return TRUE;
1839
1840 /* In the shared -Bsymbolic case, discard space allocated for
1841 dynamic pc-relative relocs against symbols which turn out to be
1842 defined in regular objects. For the normal shared case, discard
1843 space for pc-relative relocs that have become local due to symbol
1844 visibility changes. */
1845
1846 if (info->shared)
1847 {
1848 if (SYMBOL_REFERENCES_LOCAL (info, h))
1849 {
1850 struct elf_s390_dyn_relocs **pp;
1851
1852 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1853 {
1854 p->count -= p->pc_count;
1855 p->pc_count = 0;
1856 if (p->count == 0)
1857 *pp = p->next;
1858 else
1859 pp = &p->next;
1860 }
1861 }
1862
1863 /* Also discard relocs on undefined weak syms with non-default
1864 visibility. */
1865 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1866 && h->root.type == bfd_link_hash_undefweak)
1867 eh->dyn_relocs = NULL;
1868 }
1869 else if (ELIMINATE_COPY_RELOCS)
1870 {
1871 /* For the non-shared case, discard space for relocs against
1872 symbols which turn out to need copy relocs or are not
1873 dynamic. */
1874
1875 if (!h->non_got_ref
1876 && ((h->def_dynamic
1877 && !h->def_regular)
1878 || (htab->elf.dynamic_sections_created
1879 && (h->root.type == bfd_link_hash_undefweak
1880 || h->root.type == bfd_link_hash_undefined))))
1881 {
1882 /* Make sure this symbol is output as a dynamic symbol.
1883 Undefined weak syms won't yet be marked as dynamic. */
1884 if (h->dynindx == -1
1885 && !h->forced_local)
1886 {
1887 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1888 return FALSE;
1889 }
1890
1891 /* If that succeeded, we know we'll be keeping all the
1892 relocs. */
1893 if (h->dynindx != -1)
1894 goto keep;
1895 }
1896
1897 eh->dyn_relocs = NULL;
1898
1899 keep: ;
1900 }
1901
1902 /* Finally, allocate space. */
1903 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1904 {
1905 asection *sreloc = elf_section_data (p->sec)->sreloc;
1906 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1907 }
1908
1909 return TRUE;
1910 }
1911
1912 /* Find any dynamic relocs that apply to read-only sections. */
1913
1914 static bfd_boolean
1915 readonly_dynrelocs (h, inf)
1916 struct elf_link_hash_entry *h;
1917 PTR inf;
1918 {
1919 struct elf_s390_link_hash_entry *eh;
1920 struct elf_s390_dyn_relocs *p;
1921
1922 if (h->root.type == bfd_link_hash_warning)
1923 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1924
1925 eh = (struct elf_s390_link_hash_entry *) h;
1926 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1927 {
1928 asection *s = p->sec->output_section;
1929
1930 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1931 {
1932 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1933
1934 info->flags |= DF_TEXTREL;
1935
1936 /* Not an error, just cut short the traversal. */
1937 return FALSE;
1938 }
1939 }
1940 return TRUE;
1941 }
1942
1943 /* Set the sizes of the dynamic sections. */
1944
1945 static bfd_boolean
1946 elf_s390_size_dynamic_sections (output_bfd, info)
1947 bfd *output_bfd ATTRIBUTE_UNUSED;
1948 struct bfd_link_info *info;
1949 {
1950 struct elf_s390_link_hash_table *htab;
1951 bfd *dynobj;
1952 asection *s;
1953 bfd_boolean relocs;
1954 bfd *ibfd;
1955
1956 htab = elf_s390_hash_table (info);
1957 dynobj = htab->elf.dynobj;
1958 if (dynobj == NULL)
1959 abort ();
1960
1961 if (htab->elf.dynamic_sections_created)
1962 {
1963 /* Set the contents of the .interp section to the interpreter. */
1964 if (info->executable)
1965 {
1966 s = bfd_get_section_by_name (dynobj, ".interp");
1967 if (s == NULL)
1968 abort ();
1969 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1970 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1971 }
1972 }
1973
1974 /* Set up .got offsets for local syms, and space for local dynamic
1975 relocs. */
1976 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1977 {
1978 bfd_signed_vma *local_got;
1979 bfd_signed_vma *end_local_got;
1980 char *local_tls_type;
1981 bfd_size_type locsymcount;
1982 Elf_Internal_Shdr *symtab_hdr;
1983 asection *srela;
1984
1985 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1986 continue;
1987
1988 for (s = ibfd->sections; s != NULL; s = s->next)
1989 {
1990 struct elf_s390_dyn_relocs *p;
1991
1992 for (p = *((struct elf_s390_dyn_relocs **)
1993 &elf_section_data (s)->local_dynrel);
1994 p != NULL;
1995 p = p->next)
1996 {
1997 if (!bfd_is_abs_section (p->sec)
1998 && bfd_is_abs_section (p->sec->output_section))
1999 {
2000 /* Input section has been discarded, either because
2001 it is a copy of a linkonce section or due to
2002 linker script /DISCARD/, so we'll be discarding
2003 the relocs too. */
2004 }
2005 else if (p->count != 0)
2006 {
2007 srela = elf_section_data (p->sec)->sreloc;
2008 srela->size += p->count * sizeof (Elf64_External_Rela);
2009 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2010 info->flags |= DF_TEXTREL;
2011 }
2012 }
2013 }
2014
2015 local_got = elf_local_got_refcounts (ibfd);
2016 if (!local_got)
2017 continue;
2018
2019 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2020 locsymcount = symtab_hdr->sh_info;
2021 end_local_got = local_got + locsymcount;
2022 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2023 s = htab->sgot;
2024 srela = htab->srelgot;
2025 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2026 {
2027 if (*local_got > 0)
2028 {
2029 *local_got = s->size;
2030 s->size += GOT_ENTRY_SIZE;
2031 if (*local_tls_type == GOT_TLS_GD)
2032 s->size += GOT_ENTRY_SIZE;
2033 if (info->shared)
2034 srela->size += sizeof (Elf64_External_Rela);
2035 }
2036 else
2037 *local_got = (bfd_vma) -1;
2038 }
2039 }
2040
2041 if (htab->tls_ldm_got.refcount > 0)
2042 {
2043 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2044 relocs. */
2045 htab->tls_ldm_got.offset = htab->sgot->size;
2046 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2047 htab->srelgot->size += sizeof (Elf64_External_Rela);
2048 }
2049 else
2050 htab->tls_ldm_got.offset = -1;
2051
2052 /* Allocate global sym .plt and .got entries, and space for global
2053 sym dynamic relocs. */
2054 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2055
2056 /* We now have determined the sizes of the various dynamic sections.
2057 Allocate memory for them. */
2058 relocs = FALSE;
2059 for (s = dynobj->sections; s != NULL; s = s->next)
2060 {
2061 if ((s->flags & SEC_LINKER_CREATED) == 0)
2062 continue;
2063
2064 if (s == htab->splt
2065 || s == htab->sgot
2066 || s == htab->sgotplt)
2067 {
2068 /* Strip this section if we don't need it; see the
2069 comment below. */
2070 }
2071 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2072 {
2073 if (s->size != 0 && s != htab->srelplt)
2074 relocs = TRUE;
2075
2076 /* We use the reloc_count field as a counter if we need
2077 to copy relocs into the output file. */
2078 s->reloc_count = 0;
2079 }
2080 else
2081 {
2082 /* It's not one of our sections, so don't allocate space. */
2083 continue;
2084 }
2085
2086 if (s->size == 0)
2087 {
2088 /* If we don't need this section, strip it from the
2089 output file. This is to handle .rela.bss and
2090 .rela.plt. We must create it in
2091 create_dynamic_sections, because it must be created
2092 before the linker maps input sections to output
2093 sections. The linker does that before
2094 adjust_dynamic_symbol is called, and it is that
2095 function which decides whether anything needs to go
2096 into these sections. */
2097
2098 _bfd_strip_section_from_output (info, s);
2099 continue;
2100 }
2101
2102 /* Allocate memory for the section contents. We use bfd_zalloc
2103 here in case unused entries are not reclaimed before the
2104 section's contents are written out. This should not happen,
2105 but this way if it does, we get a R_390_NONE reloc instead
2106 of garbage. */
2107 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2108 if (s->contents == NULL)
2109 return FALSE;
2110 }
2111
2112 if (htab->elf.dynamic_sections_created)
2113 {
2114 /* Add some entries to the .dynamic section. We fill in the
2115 values later, in elf_s390_finish_dynamic_sections, but we
2116 must add the entries now so that we get the correct size for
2117 the .dynamic section. The DT_DEBUG entry is filled in by the
2118 dynamic linker and used by the debugger. */
2119 #define add_dynamic_entry(TAG, VAL) \
2120 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2121
2122 if (info->executable)
2123 {
2124 if (!add_dynamic_entry (DT_DEBUG, 0))
2125 return FALSE;
2126 }
2127
2128 if (htab->splt->size != 0)
2129 {
2130 if (!add_dynamic_entry (DT_PLTGOT, 0)
2131 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2132 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2133 || !add_dynamic_entry (DT_JMPREL, 0))
2134 return FALSE;
2135 }
2136
2137 if (relocs)
2138 {
2139 if (!add_dynamic_entry (DT_RELA, 0)
2140 || !add_dynamic_entry (DT_RELASZ, 0)
2141 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2142 return FALSE;
2143
2144 /* If any dynamic relocs apply to a read-only section,
2145 then we need a DT_TEXTREL entry. */
2146 if ((info->flags & DF_TEXTREL) == 0)
2147 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2148 (PTR) info);
2149
2150 if ((info->flags & DF_TEXTREL) != 0)
2151 {
2152 if (!add_dynamic_entry (DT_TEXTREL, 0))
2153 return FALSE;
2154 }
2155 }
2156 }
2157 #undef add_dynamic_entry
2158
2159 return TRUE;
2160 }
2161
2162 /* Return the base VMA address which should be subtracted from real addresses
2163 when resolving @dtpoff relocation.
2164 This is PT_TLS segment p_vaddr. */
2165
2166 static bfd_vma
2167 dtpoff_base (info)
2168 struct bfd_link_info *info;
2169 {
2170 /* If tls_sec is NULL, we should have signalled an error already. */
2171 if (elf_hash_table (info)->tls_sec == NULL)
2172 return 0;
2173 return elf_hash_table (info)->tls_sec->vma;
2174 }
2175
2176 /* Return the relocation value for @tpoff relocation
2177 if STT_TLS virtual address is ADDRESS. */
2178
2179 static bfd_vma
2180 tpoff (info, address)
2181 struct bfd_link_info *info;
2182 bfd_vma address;
2183 {
2184 struct elf_link_hash_table *htab = elf_hash_table (info);
2185
2186 /* If tls_sec is NULL, we should have signalled an error already. */
2187 if (htab->tls_sec == NULL)
2188 return 0;
2189 return htab->tls_size + htab->tls_sec->vma - address;
2190 }
2191
2192 /* Complain if TLS instruction relocation is against an invalid
2193 instruction. */
2194
2195 static void
2196 invalid_tls_insn (input_bfd, input_section, rel)
2197 bfd *input_bfd;
2198 asection *input_section;
2199 Elf_Internal_Rela *rel;
2200 {
2201 reloc_howto_type *howto;
2202
2203 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2204 (*_bfd_error_handler)
2205 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2206 input_bfd,
2207 input_section,
2208 (long) rel->r_offset,
2209 howto->name);
2210 }
2211
2212 /* Relocate a 390 ELF section. */
2213
2214 static bfd_boolean
2215 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2216 contents, relocs, local_syms, local_sections)
2217 bfd *output_bfd;
2218 struct bfd_link_info *info;
2219 bfd *input_bfd;
2220 asection *input_section;
2221 bfd_byte *contents;
2222 Elf_Internal_Rela *relocs;
2223 Elf_Internal_Sym *local_syms;
2224 asection **local_sections;
2225 {
2226 struct elf_s390_link_hash_table *htab;
2227 Elf_Internal_Shdr *symtab_hdr;
2228 struct elf_link_hash_entry **sym_hashes;
2229 bfd_vma *local_got_offsets;
2230 Elf_Internal_Rela *rel;
2231 Elf_Internal_Rela *relend;
2232
2233 if (info->relocatable)
2234 return TRUE;
2235
2236 htab = elf_s390_hash_table (info);
2237 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2238 sym_hashes = elf_sym_hashes (input_bfd);
2239 local_got_offsets = elf_local_got_offsets (input_bfd);
2240
2241 rel = relocs;
2242 relend = relocs + input_section->reloc_count;
2243 for (; rel < relend; rel++)
2244 {
2245 unsigned int r_type;
2246 reloc_howto_type *howto;
2247 unsigned long r_symndx;
2248 struct elf_link_hash_entry *h;
2249 Elf_Internal_Sym *sym;
2250 asection *sec;
2251 bfd_vma off;
2252 bfd_vma relocation;
2253 bfd_boolean unresolved_reloc;
2254 bfd_reloc_status_type r;
2255 int tls_type;
2256
2257 r_type = ELF64_R_TYPE (rel->r_info);
2258 if (r_type == (int) R_390_GNU_VTINHERIT
2259 || r_type == (int) R_390_GNU_VTENTRY)
2260 continue;
2261 if (r_type >= (int) R_390_max)
2262 {
2263 bfd_set_error (bfd_error_bad_value);
2264 return FALSE;
2265 }
2266
2267 howto = elf_howto_table + r_type;
2268 r_symndx = ELF64_R_SYM (rel->r_info);
2269
2270 /* This is a final link. */
2271 h = NULL;
2272 sym = NULL;
2273 sec = NULL;
2274 unresolved_reloc = FALSE;
2275 if (r_symndx < symtab_hdr->sh_info)
2276 {
2277 sym = local_syms + r_symndx;
2278 sec = local_sections[r_symndx];
2279 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2280 }
2281 else
2282 {
2283 bfd_boolean warned ATTRIBUTE_UNUSED;
2284
2285 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2286 r_symndx, symtab_hdr, sym_hashes,
2287 h, sec, relocation,
2288 unresolved_reloc, warned);
2289 }
2290
2291 switch (r_type)
2292 {
2293 case R_390_GOTPLT12:
2294 case R_390_GOTPLT16:
2295 case R_390_GOTPLT20:
2296 case R_390_GOTPLT32:
2297 case R_390_GOTPLT64:
2298 case R_390_GOTPLTENT:
2299 /* There are three cases for a GOTPLT relocation. 1) The
2300 relocation is against the jump slot entry of a plt that
2301 will get emitted to the output file. 2) The relocation
2302 is against the jump slot of a plt entry that has been
2303 removed. elf_s390_adjust_gotplt has created a GOT entry
2304 as replacement. 3) The relocation is against a local symbol.
2305 Cases 2) and 3) are the same as the GOT relocation code
2306 so we just have to test for case 1 and fall through for
2307 the other two. */
2308 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2309 {
2310 bfd_vma plt_index;
2311
2312 /* Calc. index no.
2313 Current offset - size first entry / entry size. */
2314 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2315 PLT_ENTRY_SIZE;
2316
2317 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2318 addr & GOT addr. */
2319 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2320 unresolved_reloc = FALSE;
2321
2322 if (r_type == R_390_GOTPLTENT)
2323 relocation += htab->sgot->output_section->vma;
2324 break;
2325 }
2326 /* Fall through. */
2327
2328 case R_390_GOT12:
2329 case R_390_GOT16:
2330 case R_390_GOT20:
2331 case R_390_GOT32:
2332 case R_390_GOT64:
2333 case R_390_GOTENT:
2334 /* Relocation is to the entry for this symbol in the global
2335 offset table. */
2336 if (htab->sgot == NULL)
2337 abort ();
2338
2339 if (h != NULL)
2340 {
2341 bfd_boolean dyn;
2342
2343 off = h->got.offset;
2344 dyn = htab->elf.dynamic_sections_created;
2345 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2346 || (info->shared
2347 && (info->symbolic
2348 || h->dynindx == -1
2349 || h->forced_local)
2350 && h->def_regular)
2351 || (ELF_ST_VISIBILITY (h->other)
2352 && h->root.type == bfd_link_hash_undefweak))
2353 {
2354 /* This is actually a static link, or it is a
2355 -Bsymbolic link and the symbol is defined
2356 locally, or the symbol was forced to be local
2357 because of a version file. We must initialize
2358 this entry in the global offset table. Since the
2359 offset must always be a multiple of 2, we use the
2360 least significant bit to record whether we have
2361 initialized it already.
2362
2363 When doing a dynamic link, we create a .rel.got
2364 relocation entry to initialize the value. This
2365 is done in the finish_dynamic_symbol routine. */
2366 if ((off & 1) != 0)
2367 off &= ~1;
2368 else
2369 {
2370 bfd_put_64 (output_bfd, relocation,
2371 htab->sgot->contents + off);
2372 h->got.offset |= 1;
2373 }
2374 }
2375 else
2376 unresolved_reloc = FALSE;
2377 }
2378 else
2379 {
2380 if (local_got_offsets == NULL)
2381 abort ();
2382
2383 off = local_got_offsets[r_symndx];
2384
2385 /* The offset must always be a multiple of 8. We use
2386 the least significant bit to record whether we have
2387 already generated the necessary reloc. */
2388 if ((off & 1) != 0)
2389 off &= ~1;
2390 else
2391 {
2392 bfd_put_64 (output_bfd, relocation,
2393 htab->sgot->contents + off);
2394
2395 if (info->shared)
2396 {
2397 asection *s;
2398 Elf_Internal_Rela outrel;
2399 bfd_byte *loc;
2400
2401 s = htab->srelgot;
2402 if (s == NULL)
2403 abort ();
2404
2405 outrel.r_offset = (htab->sgot->output_section->vma
2406 + htab->sgot->output_offset
2407 + off);
2408 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2409 outrel.r_addend = relocation;
2410 loc = s->contents;
2411 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2412 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2413 }
2414
2415 local_got_offsets[r_symndx] |= 1;
2416 }
2417 }
2418
2419 if (off >= (bfd_vma) -2)
2420 abort ();
2421
2422 relocation = htab->sgot->output_offset + off;
2423
2424 /* For @GOTENT the relocation is against the offset between
2425 the instruction and the symbols entry in the GOT and not
2426 between the start of the GOT and the symbols entry. We
2427 add the vma of the GOT to get the correct value. */
2428 if ( r_type == R_390_GOTENT
2429 || r_type == R_390_GOTPLTENT)
2430 relocation += htab->sgot->output_section->vma;
2431
2432 break;
2433
2434 case R_390_GOTOFF16:
2435 case R_390_GOTOFF32:
2436 case R_390_GOTOFF64:
2437 /* Relocation is relative to the start of the global offset
2438 table. */
2439
2440 /* Note that sgot->output_offset is not involved in this
2441 calculation. We always want the start of .got. If we
2442 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2443 permitted by the ABI, we might have to change this
2444 calculation. */
2445 relocation -= htab->sgot->output_section->vma;
2446 break;
2447
2448 case R_390_GOTPC:
2449 case R_390_GOTPCDBL:
2450 /* Use global offset table as symbol value. */
2451 relocation = htab->sgot->output_section->vma;
2452 unresolved_reloc = FALSE;
2453 break;
2454
2455 case R_390_PLT16DBL:
2456 case R_390_PLT32:
2457 case R_390_PLT32DBL:
2458 case R_390_PLT64:
2459 /* Relocation is to the entry for this symbol in the
2460 procedure linkage table. */
2461
2462 /* Resolve a PLT32 reloc against a local symbol directly,
2463 without using the procedure linkage table. */
2464 if (h == NULL)
2465 break;
2466
2467 if (h->plt.offset == (bfd_vma) -1
2468 || htab->splt == NULL)
2469 {
2470 /* We didn't make a PLT entry for this symbol. This
2471 happens when statically linking PIC code, or when
2472 using -Bsymbolic. */
2473 break;
2474 }
2475
2476 relocation = (htab->splt->output_section->vma
2477 + htab->splt->output_offset
2478 + h->plt.offset);
2479 unresolved_reloc = FALSE;
2480 break;
2481
2482 case R_390_PLTOFF16:
2483 case R_390_PLTOFF32:
2484 case R_390_PLTOFF64:
2485 /* Relocation is to the entry for this symbol in the
2486 procedure linkage table relative to the start of the GOT. */
2487
2488 /* For local symbols or if we didn't make a PLT entry for
2489 this symbol resolve the symbol directly. */
2490 if ( h == NULL
2491 || h->plt.offset == (bfd_vma) -1
2492 || htab->splt == NULL)
2493 {
2494 relocation -= htab->sgot->output_section->vma;
2495 break;
2496 }
2497
2498 relocation = (htab->splt->output_section->vma
2499 + htab->splt->output_offset
2500 + h->plt.offset
2501 - htab->sgot->output_section->vma);
2502 unresolved_reloc = FALSE;
2503 break;
2504
2505 case R_390_8:
2506 case R_390_16:
2507 case R_390_32:
2508 case R_390_64:
2509 case R_390_PC16:
2510 case R_390_PC16DBL:
2511 case R_390_PC32:
2512 case R_390_PC32DBL:
2513 case R_390_PC64:
2514 /* r_symndx will be zero only for relocs against symbols
2515 from removed linkonce sections, or sections discarded by
2516 a linker script. */
2517 if (r_symndx == 0
2518 || (input_section->flags & SEC_ALLOC) == 0)
2519 break;
2520
2521 if ((info->shared
2522 && (h == NULL
2523 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2524 || h->root.type != bfd_link_hash_undefweak)
2525 && ((r_type != R_390_PC16
2526 && r_type != R_390_PC16DBL
2527 && r_type != R_390_PC32
2528 && r_type != R_390_PC32DBL
2529 && r_type != R_390_PC64)
2530 || (h != NULL
2531 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2532 || (ELIMINATE_COPY_RELOCS
2533 && !info->shared
2534 && h != NULL
2535 && h->dynindx != -1
2536 && !h->non_got_ref
2537 && ((h->def_dynamic
2538 && !h->def_regular)
2539 || h->root.type == bfd_link_hash_undefweak
2540 || h->root.type == bfd_link_hash_undefined)))
2541 {
2542 Elf_Internal_Rela outrel;
2543 bfd_boolean skip, relocate;
2544 asection *sreloc;
2545 bfd_byte *loc;
2546
2547 /* When generating a shared object, these relocations
2548 are copied into the output file to be resolved at run
2549 time. */
2550 skip = FALSE;
2551 relocate = FALSE;
2552
2553 outrel.r_offset =
2554 _bfd_elf_section_offset (output_bfd, info, input_section,
2555 rel->r_offset);
2556 if (outrel.r_offset == (bfd_vma) -1)
2557 skip = TRUE;
2558 else if (outrel.r_offset == (bfd_vma) -2)
2559 skip = TRUE, relocate = TRUE;
2560
2561 outrel.r_offset += (input_section->output_section->vma
2562 + input_section->output_offset);
2563
2564 if (skip)
2565 memset (&outrel, 0, sizeof outrel);
2566 else if (h != NULL
2567 && h->dynindx != -1
2568 && (r_type == R_390_PC16
2569 || r_type == R_390_PC16DBL
2570 || r_type == R_390_PC32
2571 || r_type == R_390_PC32DBL
2572 || r_type == R_390_PC64
2573 || !info->shared
2574 || !info->symbolic
2575 || !h->def_regular))
2576 {
2577 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2578 outrel.r_addend = rel->r_addend;
2579 }
2580 else
2581 {
2582 /* This symbol is local, or marked to become local. */
2583 outrel.r_addend = relocation + rel->r_addend;
2584 if (r_type == R_390_64)
2585 {
2586 relocate = TRUE;
2587 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2588 }
2589 else
2590 {
2591 long sindx;
2592
2593 if (bfd_is_abs_section (sec))
2594 sindx = 0;
2595 else if (sec == NULL || sec->owner == NULL)
2596 {
2597 bfd_set_error(bfd_error_bad_value);
2598 return FALSE;
2599 }
2600 else
2601 {
2602 asection *osec;
2603
2604 osec = sec->output_section;
2605 sindx = elf_section_data (osec)->dynindx;
2606 BFD_ASSERT (sindx > 0);
2607
2608 /* We are turning this relocation into one
2609 against a section symbol, so subtract out
2610 the output section's address but not the
2611 offset of the input section in the output
2612 section. */
2613
2614 outrel.r_addend -= osec->vma;
2615 }
2616 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2617 }
2618 }
2619
2620 sreloc = elf_section_data (input_section)->sreloc;
2621 if (sreloc == NULL)
2622 abort ();
2623
2624 loc = sreloc->contents;
2625 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2626 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2627
2628 /* If this reloc is against an external symbol, we do
2629 not want to fiddle with the addend. Otherwise, we
2630 need to include the symbol value so that it becomes
2631 an addend for the dynamic reloc. */
2632 if (! relocate)
2633 continue;
2634 }
2635
2636 break;
2637
2638 /* Relocations for tls literal pool entries. */
2639 case R_390_TLS_IE64:
2640 if (info->shared)
2641 {
2642 Elf_Internal_Rela outrel;
2643 asection *sreloc;
2644 bfd_byte *loc;
2645
2646 outrel.r_offset = rel->r_offset
2647 + input_section->output_section->vma
2648 + input_section->output_offset;
2649 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2650 sreloc = elf_section_data (input_section)->sreloc;
2651 if (sreloc == NULL)
2652 abort ();
2653 loc = sreloc->contents;
2654 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2655 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2656 }
2657 /* Fall through. */
2658
2659 case R_390_TLS_GD64:
2660 case R_390_TLS_GOTIE64:
2661 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2662 tls_type = GOT_UNKNOWN;
2663 if (h == NULL && local_got_offsets)
2664 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2665 else if (h != NULL)
2666 {
2667 tls_type = elf_s390_hash_entry(h)->tls_type;
2668 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2669 r_type = R_390_TLS_LE64;
2670 }
2671 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2672 r_type = R_390_TLS_IE64;
2673
2674 if (r_type == R_390_TLS_LE64)
2675 {
2676 /* This relocation gets optimized away by the local exec
2677 access optimization. */
2678 BFD_ASSERT (! unresolved_reloc);
2679 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2680 contents + rel->r_offset);
2681 continue;
2682 }
2683
2684 if (htab->sgot == NULL)
2685 abort ();
2686
2687 if (h != NULL)
2688 off = h->got.offset;
2689 else
2690 {
2691 if (local_got_offsets == NULL)
2692 abort ();
2693
2694 off = local_got_offsets[r_symndx];
2695 }
2696
2697 emit_tls_relocs:
2698
2699 if ((off & 1) != 0)
2700 off &= ~1;
2701 else
2702 {
2703 Elf_Internal_Rela outrel;
2704 bfd_byte *loc;
2705 int dr_type, indx;
2706
2707 if (htab->srelgot == NULL)
2708 abort ();
2709
2710 outrel.r_offset = (htab->sgot->output_section->vma
2711 + htab->sgot->output_offset + off);
2712
2713 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2714 if (r_type == R_390_TLS_GD64)
2715 dr_type = R_390_TLS_DTPMOD;
2716 else
2717 dr_type = R_390_TLS_TPOFF;
2718 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2719 outrel.r_addend = relocation - dtpoff_base (info);
2720 else
2721 outrel.r_addend = 0;
2722 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2723 loc = htab->srelgot->contents;
2724 loc += htab->srelgot->reloc_count++
2725 * sizeof (Elf64_External_Rela);
2726 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2727
2728 if (r_type == R_390_TLS_GD64)
2729 {
2730 if (indx == 0)
2731 {
2732 BFD_ASSERT (! unresolved_reloc);
2733 bfd_put_64 (output_bfd,
2734 relocation - dtpoff_base (info),
2735 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2736 }
2737 else
2738 {
2739 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2740 outrel.r_offset += GOT_ENTRY_SIZE;
2741 outrel.r_addend = 0;
2742 htab->srelgot->reloc_count++;
2743 loc += sizeof (Elf64_External_Rela);
2744 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2745 }
2746 }
2747
2748 if (h != NULL)
2749 h->got.offset |= 1;
2750 else
2751 local_got_offsets[r_symndx] |= 1;
2752 }
2753
2754 if (off >= (bfd_vma) -2)
2755 abort ();
2756 if (r_type == ELF64_R_TYPE (rel->r_info))
2757 {
2758 relocation = htab->sgot->output_offset + off;
2759 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2760 relocation += htab->sgot->output_section->vma;
2761 unresolved_reloc = FALSE;
2762 }
2763 else
2764 {
2765 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2766 contents + rel->r_offset);
2767 continue;
2768 }
2769 break;
2770
2771 case R_390_TLS_GOTIE12:
2772 case R_390_TLS_GOTIE20:
2773 case R_390_TLS_IEENT:
2774 if (h == NULL)
2775 {
2776 if (local_got_offsets == NULL)
2777 abort();
2778 off = local_got_offsets[r_symndx];
2779 if (info->shared)
2780 goto emit_tls_relocs;
2781 }
2782 else
2783 {
2784 off = h->got.offset;
2785 tls_type = elf_s390_hash_entry(h)->tls_type;
2786 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2787 goto emit_tls_relocs;
2788 }
2789
2790 if (htab->sgot == NULL)
2791 abort ();
2792
2793 BFD_ASSERT (! unresolved_reloc);
2794 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2795 htab->sgot->contents + off);
2796 relocation = htab->sgot->output_offset + off;
2797 if (r_type == R_390_TLS_IEENT)
2798 relocation += htab->sgot->output_section->vma;
2799 unresolved_reloc = FALSE;
2800 break;
2801
2802 case R_390_TLS_LDM64:
2803 if (! info->shared)
2804 /* The literal pool entry this relocation refers to gets ignored
2805 by the optimized code of the local exec model. Do nothing
2806 and the value will turn out zero. */
2807 continue;
2808
2809 if (htab->sgot == NULL)
2810 abort ();
2811
2812 off = htab->tls_ldm_got.offset;
2813 if (off & 1)
2814 off &= ~1;
2815 else
2816 {
2817 Elf_Internal_Rela outrel;
2818 bfd_byte *loc;
2819
2820 if (htab->srelgot == NULL)
2821 abort ();
2822
2823 outrel.r_offset = (htab->sgot->output_section->vma
2824 + htab->sgot->output_offset + off);
2825
2826 bfd_put_64 (output_bfd, 0,
2827 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2828 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2829 outrel.r_addend = 0;
2830 loc = htab->srelgot->contents;
2831 loc += htab->srelgot->reloc_count++
2832 * sizeof (Elf64_External_Rela);
2833 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2834 htab->tls_ldm_got.offset |= 1;
2835 }
2836 relocation = htab->sgot->output_offset + off;
2837 unresolved_reloc = FALSE;
2838 break;
2839
2840 case R_390_TLS_LE64:
2841 if (info->shared)
2842 {
2843 /* Linking a shared library with non-fpic code requires
2844 a R_390_TLS_TPOFF relocation. */
2845 Elf_Internal_Rela outrel;
2846 asection *sreloc;
2847 bfd_byte *loc;
2848 int indx;
2849
2850 outrel.r_offset = rel->r_offset
2851 + input_section->output_section->vma
2852 + input_section->output_offset;
2853 if (h != NULL && h->dynindx != -1)
2854 indx = h->dynindx;
2855 else
2856 indx = 0;
2857 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2858 if (indx == 0)
2859 outrel.r_addend = relocation - dtpoff_base (info);
2860 else
2861 outrel.r_addend = 0;
2862 sreloc = elf_section_data (input_section)->sreloc;
2863 if (sreloc == NULL)
2864 abort ();
2865 loc = sreloc->contents;
2866 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2867 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2868 }
2869 else
2870 {
2871 BFD_ASSERT (! unresolved_reloc);
2872 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2873 contents + rel->r_offset);
2874 }
2875 continue;
2876
2877 case R_390_TLS_LDO64:
2878 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2879 relocation -= dtpoff_base (info);
2880 else
2881 /* When converting LDO to LE, we must negate. */
2882 relocation = -tpoff (info, relocation);
2883 break;
2884
2885 /* Relocations for tls instructions. */
2886 case R_390_TLS_LOAD:
2887 case R_390_TLS_GDCALL:
2888 case R_390_TLS_LDCALL:
2889 tls_type = GOT_UNKNOWN;
2890 if (h == NULL && local_got_offsets)
2891 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2892 else if (h != NULL)
2893 tls_type = elf_s390_hash_entry(h)->tls_type;
2894
2895 if (tls_type == GOT_TLS_GD)
2896 continue;
2897
2898 if (r_type == R_390_TLS_LOAD)
2899 {
2900 if (!info->shared && (h == NULL || h->dynindx == -1))
2901 {
2902 /* IE->LE transition. Four valid cases:
2903 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2904 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2905 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2906 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2907 unsigned int insn0, insn1, ry;
2908
2909 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2910 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2911 if (insn1 != 0x0004)
2912 invalid_tls_insn (input_bfd, input_section, rel);
2913 ry = 0;
2914 if ((insn0 & 0xff00f000) == 0xe3000000)
2915 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2916 ry = (insn0 & 0x000f0000);
2917 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2918 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2919 ry = (insn0 & 0x0000f000) << 4;
2920 else if ((insn0 & 0xff00f000) == 0xe300c000)
2921 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2922 ry = (insn0 & 0x000f0000);
2923 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2924 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2925 ry = (insn0 & 0x0000f000) << 4;
2926 else
2927 invalid_tls_insn (input_bfd, input_section, rel);
2928 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2929 insn1 = 0x000d;
2930 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2931 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2932 }
2933 }
2934 else if (r_type == R_390_TLS_GDCALL)
2935 {
2936 unsigned int insn0, insn1;
2937
2938 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2939 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2940 if ((insn0 & 0xffff0000) != 0xc0e50000)
2941 invalid_tls_insn (input_bfd, input_section, rel);
2942 if (!info->shared && (h == NULL || h->dynindx == -1))
2943 {
2944 /* GD->LE transition.
2945 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2946 insn0 = 0xc0040000;
2947 insn1 = 0x0000;
2948 }
2949 else
2950 {
2951 /* GD->IE transition.
2952 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2953 insn0 = 0xe322c000;
2954 insn1 = 0x0004;
2955 }
2956 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2957 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2958 }
2959 else if (r_type == R_390_TLS_LDCALL)
2960 {
2961 if (!info->shared)
2962 {
2963 unsigned int insn0, insn1;
2964
2965 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2966 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2967 if ((insn0 & 0xffff0000) != 0xc0e50000)
2968 invalid_tls_insn (input_bfd, input_section, rel);
2969 /* LD->LE transition.
2970 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2971 insn0 = 0xc0040000;
2972 insn1 = 0x0000;
2973 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2974 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2975 }
2976 }
2977 continue;
2978
2979 default:
2980 break;
2981 }
2982
2983 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2984 because such sections are not SEC_ALLOC and thus ld.so will
2985 not process them. */
2986 if (unresolved_reloc
2987 && !((input_section->flags & SEC_DEBUGGING) != 0
2988 && h->def_dynamic))
2989 (*_bfd_error_handler)
2990 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2991 input_bfd,
2992 input_section,
2993 (long) rel->r_offset,
2994 h->root.root.string);
2995
2996 if (r_type == R_390_20
2997 || r_type == R_390_GOT20
2998 || r_type == R_390_GOTPLT20
2999 || r_type == R_390_TLS_GOTIE20)
3000 {
3001 relocation += rel->r_addend;
3002 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3003 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3004 contents, rel->r_offset,
3005 relocation, 0);
3006 }
3007 else
3008 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3009 contents, rel->r_offset,
3010 relocation, rel->r_addend);
3011
3012 if (r != bfd_reloc_ok)
3013 {
3014 const char *name;
3015
3016 if (h != NULL)
3017 name = h->root.root.string;
3018 else
3019 {
3020 name = bfd_elf_string_from_elf_section (input_bfd,
3021 symtab_hdr->sh_link,
3022 sym->st_name);
3023 if (name == NULL)
3024 return FALSE;
3025 if (*name == '\0')
3026 name = bfd_section_name (input_bfd, sec);
3027 }
3028
3029 if (r == bfd_reloc_overflow)
3030 {
3031
3032 if (! ((*info->callbacks->reloc_overflow)
3033 (info, (h ? &h->root : NULL), name, howto->name,
3034 (bfd_vma) 0, input_bfd, input_section,
3035 rel->r_offset)))
3036 return FALSE;
3037 }
3038 else
3039 {
3040 (*_bfd_error_handler)
3041 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3042 input_bfd, input_section,
3043 (long) rel->r_offset, name, (int) r);
3044 return FALSE;
3045 }
3046 }
3047 }
3048
3049 return TRUE;
3050 }
3051
3052 /* Finish up dynamic symbol handling. We set the contents of various
3053 dynamic sections here. */
3054
3055 static bfd_boolean
3056 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3057 bfd *output_bfd;
3058 struct bfd_link_info *info;
3059 struct elf_link_hash_entry *h;
3060 Elf_Internal_Sym *sym;
3061 {
3062 struct elf_s390_link_hash_table *htab;
3063
3064 htab = elf_s390_hash_table (info);
3065
3066 if (h->plt.offset != (bfd_vma) -1)
3067 {
3068 bfd_vma plt_index;
3069 bfd_vma got_offset;
3070 Elf_Internal_Rela rela;
3071 bfd_byte *loc;
3072
3073 /* This symbol has an entry in the procedure linkage table. Set
3074 it up. */
3075
3076 if (h->dynindx == -1
3077 || htab->splt == NULL
3078 || htab->sgotplt == NULL
3079 || htab->srelplt == NULL)
3080 abort ();
3081
3082 /* Calc. index no.
3083 Current offset - size first entry / entry size. */
3084 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3085
3086 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3087 addr & GOT addr. */
3088 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3089
3090 /* Fill in the blueprint of a PLT. */
3091 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3092 htab->splt->contents + h->plt.offset);
3093 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3094 htab->splt->contents + h->plt.offset + 4);
3095 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3096 htab->splt->contents + h->plt.offset + 8);
3097 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3098 htab->splt->contents + h->plt.offset + 12);
3099 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3100 htab->splt->contents + h->plt.offset + 16);
3101 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3102 htab->splt->contents + h->plt.offset + 20);
3103 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3104 htab->splt->contents + h->plt.offset + 24);
3105 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3106 htab->splt->contents + h->plt.offset + 28);
3107 /* Fixup the relative address to the GOT entry */
3108 bfd_put_32 (output_bfd,
3109 (htab->sgotplt->output_section->vma +
3110 htab->sgotplt->output_offset + got_offset
3111 - (htab->splt->output_section->vma + h->plt.offset))/2,
3112 htab->splt->contents + h->plt.offset + 2);
3113 /* Fixup the relative branch to PLT 0 */
3114 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3115 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3116 htab->splt->contents + h->plt.offset + 24);
3117 /* Fixup offset into symbol table */
3118 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3119 htab->splt->contents + h->plt.offset + 28);
3120
3121 /* Fill in the entry in the global offset table.
3122 Points to instruction after GOT offset. */
3123 bfd_put_64 (output_bfd,
3124 (htab->splt->output_section->vma
3125 + htab->splt->output_offset
3126 + h->plt.offset
3127 + 14),
3128 htab->sgotplt->contents + got_offset);
3129
3130 /* Fill in the entry in the .rela.plt section. */
3131 rela.r_offset = (htab->sgotplt->output_section->vma
3132 + htab->sgotplt->output_offset
3133 + got_offset);
3134 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3135 rela.r_addend = 0;
3136 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3137 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3138
3139 if (!h->def_regular)
3140 {
3141 /* Mark the symbol as undefined, rather than as defined in
3142 the .plt section. Leave the value alone. This is a clue
3143 for the dynamic linker, to make function pointer
3144 comparisons work between an application and shared
3145 library. */
3146 sym->st_shndx = SHN_UNDEF;
3147 }
3148 }
3149
3150 if (h->got.offset != (bfd_vma) -1
3151 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3152 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3153 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3154 {
3155 Elf_Internal_Rela rela;
3156 bfd_byte *loc;
3157
3158 /* This symbol has an entry in the global offset table. Set it
3159 up. */
3160 if (htab->sgot == NULL || htab->srelgot == NULL)
3161 abort ();
3162
3163 rela.r_offset = (htab->sgot->output_section->vma
3164 + htab->sgot->output_offset
3165 + (h->got.offset &~ (bfd_vma) 1));
3166
3167 /* If this is a static link, or it is a -Bsymbolic link and the
3168 symbol is defined locally or was forced to be local because
3169 of a version file, we just want to emit a RELATIVE reloc.
3170 The entry in the global offset table will already have been
3171 initialized in the relocate_section function. */
3172 if (info->shared
3173 && (info->symbolic
3174 || h->dynindx == -1
3175 || h->forced_local)
3176 && h->def_regular)
3177 {
3178 BFD_ASSERT((h->got.offset & 1) != 0);
3179 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3180 rela.r_addend = (h->root.u.def.value
3181 + h->root.u.def.section->output_section->vma
3182 + h->root.u.def.section->output_offset);
3183 }
3184 else
3185 {
3186 BFD_ASSERT((h->got.offset & 1) == 0);
3187 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3188 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3189 rela.r_addend = 0;
3190 }
3191
3192 loc = htab->srelgot->contents;
3193 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3194 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3195 }
3196
3197 if (h->needs_copy)
3198 {
3199 Elf_Internal_Rela rela;
3200 bfd_byte *loc;
3201
3202 /* This symbols needs a copy reloc. Set it up. */
3203
3204 if (h->dynindx == -1
3205 || (h->root.type != bfd_link_hash_defined
3206 && h->root.type != bfd_link_hash_defweak)
3207 || htab->srelbss == NULL)
3208 abort ();
3209
3210 rela.r_offset = (h->root.u.def.value
3211 + h->root.u.def.section->output_section->vma
3212 + h->root.u.def.section->output_offset);
3213 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3214 rela.r_addend = 0;
3215 loc = htab->srelbss->contents;
3216 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3217 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3218 }
3219
3220 /* Mark some specially defined symbols as absolute. */
3221 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3222 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3223 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3224 sym->st_shndx = SHN_ABS;
3225
3226 return TRUE;
3227 }
3228
3229 /* Used to decide how to sort relocs in an optimal manner for the
3230 dynamic linker, before writing them out. */
3231
3232 static enum elf_reloc_type_class
3233 elf_s390_reloc_type_class (rela)
3234 const Elf_Internal_Rela *rela;
3235 {
3236 switch ((int) ELF64_R_TYPE (rela->r_info))
3237 {
3238 case R_390_RELATIVE:
3239 return reloc_class_relative;
3240 case R_390_JMP_SLOT:
3241 return reloc_class_plt;
3242 case R_390_COPY:
3243 return reloc_class_copy;
3244 default:
3245 return reloc_class_normal;
3246 }
3247 }
3248
3249 /* Finish up the dynamic sections. */
3250
3251 static bfd_boolean
3252 elf_s390_finish_dynamic_sections (output_bfd, info)
3253 bfd *output_bfd;
3254 struct bfd_link_info *info;
3255 {
3256 struct elf_s390_link_hash_table *htab;
3257 bfd *dynobj;
3258 asection *sdyn;
3259
3260 htab = elf_s390_hash_table (info);
3261 dynobj = htab->elf.dynobj;
3262 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3263
3264 if (htab->elf.dynamic_sections_created)
3265 {
3266 Elf64_External_Dyn *dyncon, *dynconend;
3267
3268 if (sdyn == NULL || htab->sgot == NULL)
3269 abort ();
3270
3271 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3272 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3273 for (; dyncon < dynconend; dyncon++)
3274 {
3275 Elf_Internal_Dyn dyn;
3276 asection *s;
3277
3278 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3279
3280 switch (dyn.d_tag)
3281 {
3282 default:
3283 continue;
3284
3285 case DT_PLTGOT:
3286 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3287 break;
3288
3289 case DT_JMPREL:
3290 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3291 break;
3292
3293 case DT_PLTRELSZ:
3294 s = htab->srelplt->output_section;
3295 dyn.d_un.d_val = s->size;
3296 break;
3297
3298 case DT_RELASZ:
3299 /* The procedure linkage table relocs (DT_JMPREL) should
3300 not be included in the overall relocs (DT_RELA).
3301 Therefore, we override the DT_RELASZ entry here to
3302 make it not include the JMPREL relocs. Since the
3303 linker script arranges for .rela.plt to follow all
3304 other relocation sections, we don't have to worry
3305 about changing the DT_RELA entry. */
3306 s = htab->srelplt->output_section;
3307 dyn.d_un.d_val -= s->size;
3308 break;
3309 }
3310
3311 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3312 }
3313
3314 /* Fill in the special first entry in the procedure linkage table. */
3315 if (htab->splt && htab->splt->size > 0)
3316 {
3317 /* fill in blueprint for plt 0 entry */
3318 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3319 htab->splt->contents );
3320 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3321 htab->splt->contents +4 );
3322 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3323 htab->splt->contents +12 );
3324 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3325 htab->splt->contents +16 );
3326 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3327 htab->splt->contents +20 );
3328 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3329 htab->splt->contents + 24);
3330 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3331 htab->splt->contents + 28 );
3332 /* Fixup relative address to start of GOT */
3333 bfd_put_32 (output_bfd,
3334 (htab->sgotplt->output_section->vma +
3335 htab->sgotplt->output_offset
3336 - htab->splt->output_section->vma - 6)/2,
3337 htab->splt->contents + 8);
3338 }
3339 elf_section_data (htab->splt->output_section)
3340 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3341 }
3342
3343 if (htab->sgotplt)
3344 {
3345 /* Fill in the first three entries in the global offset table. */
3346 if (htab->sgotplt->size > 0)
3347 {
3348 bfd_put_64 (output_bfd,
3349 (sdyn == NULL ? (bfd_vma) 0
3350 : sdyn->output_section->vma + sdyn->output_offset),
3351 htab->sgotplt->contents);
3352 /* One entry for shared object struct ptr. */
3353 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3354 /* One entry for _dl_runtime_resolve. */
3355 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3356 }
3357
3358 elf_section_data (htab->sgot->output_section)
3359 ->this_hdr.sh_entsize = 8;
3360 }
3361 return TRUE;
3362 }
3363
3364 /* Return address for Ith PLT stub in section PLT, for relocation REL
3365 or (bfd_vma) -1 if it should not be included. */
3366
3367 static bfd_vma
3368 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3369 const arelent *rel ATTRIBUTE_UNUSED)
3370 {
3371 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3372 }
3373
3374
3375 /* Why was the hash table entry size definition changed from
3376 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3377 this is the only reason for the s390_elf64_size_info structure. */
3378
3379 const struct elf_size_info s390_elf64_size_info =
3380 {
3381 sizeof (Elf64_External_Ehdr),
3382 sizeof (Elf64_External_Phdr),
3383 sizeof (Elf64_External_Shdr),
3384 sizeof (Elf64_External_Rel),
3385 sizeof (Elf64_External_Rela),
3386 sizeof (Elf64_External_Sym),
3387 sizeof (Elf64_External_Dyn),
3388 sizeof (Elf_External_Note),
3389 8, /* hash-table entry size. */
3390 1, /* internal relocations per external relocations. */
3391 64, /* arch_size. */
3392 3, /* log_file_align. */
3393 ELFCLASS64, EV_CURRENT,
3394 bfd_elf64_write_out_phdrs,
3395 bfd_elf64_write_shdrs_and_ehdr,
3396 bfd_elf64_write_relocs,
3397 bfd_elf64_swap_symbol_in,
3398 bfd_elf64_swap_symbol_out,
3399 bfd_elf64_slurp_reloc_table,
3400 bfd_elf64_slurp_symbol_table,
3401 bfd_elf64_swap_dyn_in,
3402 bfd_elf64_swap_dyn_out,
3403 bfd_elf64_swap_reloc_in,
3404 bfd_elf64_swap_reloc_out,
3405 bfd_elf64_swap_reloca_in,
3406 bfd_elf64_swap_reloca_out
3407 };
3408
3409 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3410 #define TARGET_BIG_NAME "elf64-s390"
3411 #define ELF_ARCH bfd_arch_s390
3412 #define ELF_MACHINE_CODE EM_S390
3413 #define ELF_MACHINE_ALT1 EM_S390_OLD
3414 #define ELF_MAXPAGESIZE 0x1000
3415
3416 #define elf_backend_size_info s390_elf64_size_info
3417
3418 #define elf_backend_can_gc_sections 1
3419 #define elf_backend_can_refcount 1
3420 #define elf_backend_want_got_plt 1
3421 #define elf_backend_plt_readonly 1
3422 #define elf_backend_want_plt_sym 0
3423 #define elf_backend_got_header_size 24
3424 #define elf_backend_rela_normal 1
3425
3426 #define elf_info_to_howto elf_s390_info_to_howto
3427
3428 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3429 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3430 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3431
3432 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3433 #define elf_backend_check_relocs elf_s390_check_relocs
3434 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3435 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3436 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3437 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3438 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3439 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3440 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3441 #define elf_backend_relocate_section elf_s390_relocate_section
3442 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3443 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3444 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3445
3446 #define bfd_elf64_mkobject elf_s390_mkobject
3447 #define elf_backend_object_p elf_s390_object_p
3448
3449 #include "elf64-target.h"
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