1 /* SPARC-specific support for 32-bit ELF
2 Copyright (C) 1993-2018 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/sparc.h"
27 #include "opcode/sparc.h"
28 #include "elfxx-sparc.h"
29 #include "elf-vxworks.h"
30
31 /* Support for core dump NOTE sections. */
32
33 static bfd_boolean
elf32_sparc_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)34 elf32_sparc_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
35 {
36 switch (note->descsz)
37 {
38 default:
39 return FALSE;
40
41 case 260: /* Solaris prpsinfo_t. */
42 elf_tdata (abfd)->core->program
43 = _bfd_elfcore_strndup (abfd, note->descdata + 84, 16);
44 elf_tdata (abfd)->core->command
45 = _bfd_elfcore_strndup (abfd, note->descdata + 100, 80);
46 break;
47
48 case 336: /* Solaris psinfo_t. */
49 elf_tdata (abfd)->core->program
50 = _bfd_elfcore_strndup (abfd, note->descdata + 88, 16);
51 elf_tdata (abfd)->core->command
52 = _bfd_elfcore_strndup (abfd, note->descdata + 104, 80);
53 break;
54 }
55
56 return TRUE;
57 }
58
59 /* Functions for dealing with the e_flags field.
60
61 We don't define set_private_flags or copy_private_bfd_data because
62 the only currently defined values are based on the bfd mach number,
63 so we use the latter instead and defer setting e_flags until the
64 file is written out. */
65
66 /* Merge backend specific data from an object file to the output
67 object file when linking. */
68
69 static bfd_boolean
elf32_sparc_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)70 elf32_sparc_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
71 {
72 bfd *obfd = info->output_bfd;
73 bfd_boolean error;
74 unsigned long ibfd_mach;
75 /* FIXME: This should not be static. */
76 static unsigned long previous_ibfd_e_flags = (unsigned long) -1;
77
78 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
79 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
80 return TRUE;
81
82 error = FALSE;
83
84 ibfd_mach = bfd_get_mach (ibfd);
85 if (bfd_mach_sparc_64bit_p (ibfd_mach))
86 {
87 error = TRUE;
88 _bfd_error_handler
89 (_("%B: compiled for a 64 bit system and target is 32 bit"), ibfd);
90 }
91 else if ((ibfd->flags & DYNAMIC) == 0)
92 {
93 if (bfd_get_mach (obfd) < ibfd_mach)
94 bfd_set_arch_mach (obfd, bfd_arch_sparc, ibfd_mach);
95 }
96
97 if (((elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA)
98 != previous_ibfd_e_flags)
99 && previous_ibfd_e_flags != (unsigned long) -1)
100 {
101 _bfd_error_handler
102 (_("%B: linking little endian files with big endian files"), ibfd);
103 error = TRUE;
104 }
105 previous_ibfd_e_flags = elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA;
106
107 if (error)
108 {
109 bfd_set_error (bfd_error_bad_value);
110 return FALSE;
111 }
112
113 return _bfd_sparc_elf_merge_private_bfd_data (ibfd, info);
114 }
115
116 /* The final processing done just before writing out the object file.
117 We need to set the e_machine field appropriately. */
118
119 static void
elf32_sparc_final_write_processing(bfd * abfd,bfd_boolean linker ATTRIBUTE_UNUSED)120 elf32_sparc_final_write_processing (bfd *abfd,
121 bfd_boolean linker ATTRIBUTE_UNUSED)
122 {
123 switch (bfd_get_mach (abfd))
124 {
125 case bfd_mach_sparc :
126 case bfd_mach_sparc_sparclet :
127 case bfd_mach_sparc_sparclite :
128 break; /* nothing to do */
129 case bfd_mach_sparc_v8plus :
130 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
131 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
132 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS;
133 break;
134 case bfd_mach_sparc_v8plusa :
135 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
136 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
137 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1;
138 break;
139 case bfd_mach_sparc_v8plusb :
140 case bfd_mach_sparc_v8plusc :
141 case bfd_mach_sparc_v8plusd :
142 case bfd_mach_sparc_v8pluse :
143 case bfd_mach_sparc_v8plusv :
144 case bfd_mach_sparc_v8plusm :
145 case bfd_mach_sparc_v8plusm8 :
146 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
147 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
148 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
149 | EF_SPARC_SUN_US3;
150 break;
151 case bfd_mach_sparc_sparclite_le :
152 elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
153 break;
154 default :
155 abort ();
156 break;
157 }
158 }
159
160 static enum elf_reloc_type_class
elf32_sparc_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)161 elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
162 const asection *rel_sec ATTRIBUTE_UNUSED,
163 const Elf_Internal_Rela *rela)
164 {
165 switch ((int) ELF32_R_TYPE (rela->r_info))
166 {
167 case R_SPARC_RELATIVE:
168 return reloc_class_relative;
169 case R_SPARC_JMP_SLOT:
170 return reloc_class_plt;
171 case R_SPARC_COPY:
172 return reloc_class_copy;
173 default:
174 return reloc_class_normal;
175 }
176 }
177
178 /* Hook called by the linker routine which adds symbols from an object
179 file. */
180
181 static bfd_boolean
elf32_sparc_add_symbol_hook(bfd * abfd,struct bfd_link_info * info,Elf_Internal_Sym * sym,const char ** namep ATTRIBUTE_UNUSED,flagword * flagsp ATTRIBUTE_UNUSED,asection ** secp ATTRIBUTE_UNUSED,bfd_vma * valp ATTRIBUTE_UNUSED)182 elf32_sparc_add_symbol_hook (bfd * abfd,
183 struct bfd_link_info * info,
184 Elf_Internal_Sym * sym,
185 const char ** namep ATTRIBUTE_UNUSED,
186 flagword * flagsp ATTRIBUTE_UNUSED,
187 asection ** secp ATTRIBUTE_UNUSED,
188 bfd_vma * valp ATTRIBUTE_UNUSED)
189 {
190 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
191 && (abfd->flags & DYNAMIC) == 0
192 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
193 elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
194 return TRUE;
195 }
196
197 #define TARGET_BIG_SYM sparc_elf32_vec
198 #define TARGET_BIG_NAME "elf32-sparc"
199 #define ELF_ARCH bfd_arch_sparc
200 #define ELF_TARGET_ID SPARC_ELF_DATA
201 #define ELF_MACHINE_CODE EM_SPARC
202 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS
203 #define ELF_MAXPAGESIZE 0x10000
204 #define ELF_COMMONPAGESIZE 0x2000
205
206 #define bfd_elf32_bfd_merge_private_bfd_data \
207 elf32_sparc_merge_private_bfd_data
208 #define elf_backend_final_write_processing \
209 elf32_sparc_final_write_processing
210 #define elf_backend_grok_psinfo elf32_sparc_grok_psinfo
211 #define elf_backend_reloc_type_class elf32_sparc_reloc_type_class
212
213 #define elf_info_to_howto _bfd_sparc_elf_info_to_howto
214 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
215 #define bfd_elf32_bfd_reloc_name_lookup \
216 _bfd_sparc_elf_reloc_name_lookup
217 #define bfd_elf32_bfd_link_hash_table_create \
218 _bfd_sparc_elf_link_hash_table_create
219 #define bfd_elf32_bfd_relax_section _bfd_sparc_elf_relax_section
220 #define bfd_elf32_new_section_hook _bfd_sparc_elf_new_section_hook
221 #define elf_backend_copy_indirect_symbol \
222 _bfd_sparc_elf_copy_indirect_symbol
223 #define elf_backend_create_dynamic_sections \
224 _bfd_sparc_elf_create_dynamic_sections
225 #define elf_backend_check_relocs _bfd_sparc_elf_check_relocs
226 #define elf_backend_adjust_dynamic_symbol \
227 _bfd_sparc_elf_adjust_dynamic_symbol
228 #define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym
229 #define elf_backend_size_dynamic_sections \
230 _bfd_sparc_elf_size_dynamic_sections
231 #define elf_backend_relocate_section _bfd_sparc_elf_relocate_section
232 #define elf_backend_finish_dynamic_symbol \
233 _bfd_sparc_elf_finish_dynamic_symbol
234 #define elf_backend_finish_dynamic_sections \
235 _bfd_sparc_elf_finish_dynamic_sections
236 #define bfd_elf32_mkobject _bfd_sparc_elf_mkobject
237 #define elf_backend_object_p _bfd_sparc_elf_object_p
238 #define elf_backend_gc_mark_hook _bfd_sparc_elf_gc_mark_hook
239 #define elf_backend_plt_sym_val _bfd_sparc_elf_plt_sym_val
240 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
241 #define elf_backend_fixup_symbol _bfd_sparc_elf_fixup_symbol
242
243 #define elf_backend_can_gc_sections 1
244 #define elf_backend_can_refcount 1
245 #define elf_backend_want_got_plt 0
246 #define elf_backend_plt_readonly 0
247 #define elf_backend_want_plt_sym 1
248 #define elf_backend_got_header_size 4
249 #define elf_backend_want_dynrelro 1
250 #define elf_backend_rela_normal 1
251
252 #define elf_backend_add_symbol_hook elf32_sparc_add_symbol_hook
253
254 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
255
256 #include "elf32-target.h"
257
258 /* Solaris 2. */
259
260 #undef TARGET_BIG_SYM
261 #define TARGET_BIG_SYM sparc_elf32_sol2_vec
262 #undef TARGET_BIG_NAME
263 #define TARGET_BIG_NAME "elf32-sparc-sol2"
264
265 #undef elf32_bed
266 #define elf32_bed elf32_sparc_sol2_bed
267
268 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
269 boundary. */
270 #undef elf_backend_static_tls_alignment
271 #define elf_backend_static_tls_alignment 8
272
273 #undef elf_backend_strtab_flags
274 #define elf_backend_strtab_flags SHF_STRINGS
275
276 static bfd_boolean
elf32_sparc_copy_solaris_special_section_fields(const bfd * ibfd ATTRIBUTE_UNUSED,bfd * obfd ATTRIBUTE_UNUSED,const Elf_Internal_Shdr * isection ATTRIBUTE_UNUSED,Elf_Internal_Shdr * osection ATTRIBUTE_UNUSED)277 elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
278 bfd *obfd ATTRIBUTE_UNUSED,
279 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
280 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
281 {
282 /* PR 19938: FIXME: Need to add code for setting the sh_info
283 and sh_link fields of Solaris specific section types. */
284 return FALSE;
285 }
286
287 #undef elf_backend_copy_special_section_fields
288 #define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields
289
290 #include "elf32-target.h"
291
292 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
293 the target system as VxWorks. */
294
295 static struct bfd_link_hash_table *
elf32_sparc_vxworks_link_hash_table_create(bfd * abfd)296 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
297 {
298 struct bfd_link_hash_table *ret;
299
300 ret = _bfd_sparc_elf_link_hash_table_create (abfd);
301 if (ret)
302 {
303 struct _bfd_sparc_elf_link_hash_table *htab;
304
305 htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
306 htab->is_vxworks = 1;
307 }
308 return ret;
309 }
310
311 /* A final_write_processing hook that does both the SPARC- and VxWorks-
312 specific handling. */
313
314 static void
elf32_sparc_vxworks_final_write_processing(bfd * abfd,bfd_boolean linker)315 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
316 {
317 elf32_sparc_final_write_processing (abfd, linker);
318 elf_vxworks_final_write_processing (abfd, linker);
319 }
320
321 #undef TARGET_BIG_SYM
322 #define TARGET_BIG_SYM sparc_elf32_vxworks_vec
323 #undef TARGET_BIG_NAME
324 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
325
326 #undef ELF_MINPAGESIZE
327 #define ELF_MINPAGESIZE 0x1000
328
329 #undef bfd_elf32_bfd_link_hash_table_create
330 #define bfd_elf32_bfd_link_hash_table_create \
331 elf32_sparc_vxworks_link_hash_table_create
332
333 #undef elf_backend_want_got_plt
334 #define elf_backend_want_got_plt 1
335 #undef elf_backend_plt_readonly
336 #define elf_backend_plt_readonly 1
337 #undef elf_backend_got_header_size
338 #define elf_backend_got_header_size 12
339 #undef elf_backend_dtrel_excludes_plt
340 #define elf_backend_dtrel_excludes_plt 1
341 #undef elf_backend_add_symbol_hook
342 #define elf_backend_add_symbol_hook \
343 elf_vxworks_add_symbol_hook
344 #undef elf_backend_link_output_symbol_hook
345 #define elf_backend_link_output_symbol_hook \
346 elf_vxworks_link_output_symbol_hook
347 #undef elf_backend_emit_relocs
348 #define elf_backend_emit_relocs \
349 elf_vxworks_emit_relocs
350 #undef elf_backend_final_write_processing
351 #define elf_backend_final_write_processing \
352 elf32_sparc_vxworks_final_write_processing
353 #undef elf_backend_static_tls_alignment
354 #undef elf_backend_strtab_flags
355 #undef elf_backend_copy_special_section_fields
356
357 #undef elf32_bed
358 #define elf32_bed sparc_elf_vxworks_bed
359
360 #include "elf32-target.h"
361