1 /* SPARC-specific support for 32-bit ELF 2 Copyright (C) 1993-2020 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 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 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 (_("%pB: 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 (_("%pB: 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 120 sparc_final_write_processing (bfd *abfd) 121 { 122 switch (bfd_get_mach (abfd)) 123 { 124 case bfd_mach_sparc : 125 case bfd_mach_sparc_sparclet : 126 case bfd_mach_sparc_sparclite : 127 break; /* nothing to do */ 128 case bfd_mach_sparc_v8plus : 129 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS; 130 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK; 131 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS; 132 break; 133 case bfd_mach_sparc_v8plusa : 134 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS; 135 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK; 136 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1; 137 break; 138 case bfd_mach_sparc_v8plusb : 139 case bfd_mach_sparc_v8plusc : 140 case bfd_mach_sparc_v8plusd : 141 case bfd_mach_sparc_v8pluse : 142 case bfd_mach_sparc_v8plusv : 143 case bfd_mach_sparc_v8plusm : 144 case bfd_mach_sparc_v8plusm8 : 145 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS; 146 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK; 147 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1 148 | EF_SPARC_SUN_US3; 149 break; 150 case bfd_mach_sparc_sparclite_le : 151 elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA; 152 break; 153 default : 154 abort (); 155 break; 156 } 157 } 158 159 static bfd_boolean 160 elf32_sparc_final_write_processing (bfd *abfd) 161 { 162 sparc_final_write_processing (abfd); 163 return _bfd_elf_final_write_processing (abfd); 164 } 165 166 /* Used to decide how to sort relocs in an optimal manner for the 167 dynamic linker, before writing them out. */ 168 169 static enum elf_reloc_type_class 170 elf32_sparc_reloc_type_class (const struct bfd_link_info *info, 171 const asection *rel_sec ATTRIBUTE_UNUSED, 172 const Elf_Internal_Rela *rela) 173 { 174 bfd *abfd = info->output_bfd; 175 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 176 struct _bfd_sparc_elf_link_hash_table *htab 177 = _bfd_sparc_elf_hash_table (info); 178 BFD_ASSERT (htab != NULL); 179 180 if (htab->elf.dynsym != NULL 181 && htab->elf.dynsym->contents != NULL) 182 { 183 /* Check relocation against STT_GNU_IFUNC symbol if there are 184 dynamic symbols. */ 185 unsigned long r_symndx = htab->r_symndx (rela->r_info); 186 if (r_symndx != STN_UNDEF) 187 { 188 Elf_Internal_Sym sym; 189 if (!bed->s->swap_symbol_in (abfd, 190 (htab->elf.dynsym->contents 191 + r_symndx * bed->s->sizeof_sym), 192 0, &sym)) 193 abort (); 194 195 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 196 return reloc_class_ifunc; 197 } 198 } 199 200 switch ((int) ELF32_R_TYPE (rela->r_info)) 201 { 202 case R_SPARC_IRELATIVE: 203 return reloc_class_ifunc; 204 case R_SPARC_RELATIVE: 205 return reloc_class_relative; 206 case R_SPARC_JMP_SLOT: 207 return reloc_class_plt; 208 case R_SPARC_COPY: 209 return reloc_class_copy; 210 default: 211 return reloc_class_normal; 212 } 213 } 214 215 #define TARGET_BIG_SYM sparc_elf32_vec 216 #define TARGET_BIG_NAME "elf32-sparc" 217 #define ELF_ARCH bfd_arch_sparc 218 #define ELF_TARGET_ID SPARC_ELF_DATA 219 #define ELF_MACHINE_CODE EM_SPARC 220 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS 221 #define ELF_MAXPAGESIZE 0x10000 222 #define ELF_COMMONPAGESIZE 0x2000 223 224 #define bfd_elf32_bfd_merge_private_bfd_data \ 225 elf32_sparc_merge_private_bfd_data 226 #define elf_backend_final_write_processing \ 227 elf32_sparc_final_write_processing 228 #define elf_backend_grok_psinfo elf32_sparc_grok_psinfo 229 #define elf_backend_reloc_type_class elf32_sparc_reloc_type_class 230 231 #define elf_info_to_howto _bfd_sparc_elf_info_to_howto 232 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup 233 #define bfd_elf32_bfd_reloc_name_lookup \ 234 _bfd_sparc_elf_reloc_name_lookup 235 #define bfd_elf32_bfd_link_hash_table_create \ 236 _bfd_sparc_elf_link_hash_table_create 237 #define bfd_elf32_bfd_relax_section _bfd_sparc_elf_relax_section 238 #define bfd_elf32_new_section_hook _bfd_sparc_elf_new_section_hook 239 #define elf_backend_copy_indirect_symbol \ 240 _bfd_sparc_elf_copy_indirect_symbol 241 #define elf_backend_create_dynamic_sections \ 242 _bfd_sparc_elf_create_dynamic_sections 243 #define elf_backend_check_relocs _bfd_sparc_elf_check_relocs 244 #define elf_backend_adjust_dynamic_symbol \ 245 _bfd_sparc_elf_adjust_dynamic_symbol 246 #define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym 247 #define elf_backend_size_dynamic_sections \ 248 _bfd_sparc_elf_size_dynamic_sections 249 #define elf_backend_relocate_section _bfd_sparc_elf_relocate_section 250 #define elf_backend_finish_dynamic_symbol \ 251 _bfd_sparc_elf_finish_dynamic_symbol 252 #define elf_backend_finish_dynamic_sections \ 253 _bfd_sparc_elf_finish_dynamic_sections 254 #define bfd_elf32_mkobject _bfd_sparc_elf_mkobject 255 #define elf_backend_object_p _bfd_sparc_elf_object_p 256 #define elf_backend_gc_mark_hook _bfd_sparc_elf_gc_mark_hook 257 #define elf_backend_plt_sym_val _bfd_sparc_elf_plt_sym_val 258 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 259 #define elf_backend_fixup_symbol _bfd_sparc_elf_fixup_symbol 260 261 #define elf_backend_can_gc_sections 1 262 #define elf_backend_can_refcount 1 263 #define elf_backend_want_got_plt 0 264 #define elf_backend_plt_readonly 0 265 #define elf_backend_want_plt_sym 1 266 #define elf_backend_got_header_size 4 267 #define elf_backend_want_dynrelro 1 268 #define elf_backend_rela_normal 1 269 270 #define elf_backend_linux_prpsinfo32_ugid16 TRUE 271 272 #include "elf32-target.h" 273 274 /* Solaris 2. */ 275 276 #undef TARGET_BIG_SYM 277 #define TARGET_BIG_SYM sparc_elf32_sol2_vec 278 #undef TARGET_BIG_NAME 279 #define TARGET_BIG_NAME "elf32-sparc-sol2" 280 281 #undef elf32_bed 282 #define elf32_bed elf32_sparc_sol2_bed 283 284 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte 285 boundary. */ 286 #undef elf_backend_static_tls_alignment 287 #define elf_backend_static_tls_alignment 8 288 289 #undef elf_backend_strtab_flags 290 #define elf_backend_strtab_flags SHF_STRINGS 291 292 static bfd_boolean 293 elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 294 bfd *obfd ATTRIBUTE_UNUSED, 295 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 296 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 297 { 298 /* PR 19938: FIXME: Need to add code for setting the sh_info 299 and sh_link fields of Solaris specific section types. */ 300 return FALSE; 301 } 302 303 #undef elf_backend_copy_special_section_fields 304 #define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields 305 306 #include "elf32-target.h" 307 308 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies 309 the target system as VxWorks. */ 310 311 static struct bfd_link_hash_table * 312 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd) 313 { 314 struct bfd_link_hash_table *ret; 315 316 ret = _bfd_sparc_elf_link_hash_table_create (abfd); 317 if (ret) 318 { 319 struct _bfd_sparc_elf_link_hash_table *htab; 320 321 htab = (struct _bfd_sparc_elf_link_hash_table *) ret; 322 htab->is_vxworks = 1; 323 } 324 return ret; 325 } 326 327 /* A final_write_processing hook that does both the SPARC- and VxWorks- 328 specific handling. */ 329 330 static bfd_boolean 331 elf32_sparc_vxworks_final_write_processing (bfd *abfd) 332 { 333 sparc_final_write_processing (abfd); 334 return elf_vxworks_final_write_processing (abfd); 335 } 336 337 #undef TARGET_BIG_SYM 338 #define TARGET_BIG_SYM sparc_elf32_vxworks_vec 339 #undef TARGET_BIG_NAME 340 #define TARGET_BIG_NAME "elf32-sparc-vxworks" 341 342 #undef ELF_MINPAGESIZE 343 #define ELF_MINPAGESIZE 0x1000 344 345 #undef bfd_elf32_bfd_link_hash_table_create 346 #define bfd_elf32_bfd_link_hash_table_create \ 347 elf32_sparc_vxworks_link_hash_table_create 348 349 #undef elf_backend_want_got_plt 350 #define elf_backend_want_got_plt 1 351 #undef elf_backend_plt_readonly 352 #define elf_backend_plt_readonly 1 353 #undef elf_backend_got_header_size 354 #define elf_backend_got_header_size 12 355 #undef elf_backend_dtrel_excludes_plt 356 #define elf_backend_dtrel_excludes_plt 1 357 #undef elf_backend_add_symbol_hook 358 #define elf_backend_add_symbol_hook \ 359 elf_vxworks_add_symbol_hook 360 #undef elf_backend_link_output_symbol_hook 361 #define elf_backend_link_output_symbol_hook \ 362 elf_vxworks_link_output_symbol_hook 363 #undef elf_backend_emit_relocs 364 #define elf_backend_emit_relocs \ 365 elf_vxworks_emit_relocs 366 #undef elf_backend_final_write_processing 367 #define elf_backend_final_write_processing \ 368 elf32_sparc_vxworks_final_write_processing 369 #undef elf_backend_static_tls_alignment 370 #undef elf_backend_strtab_flags 371 #undef elf_backend_copy_special_section_fields 372 373 #undef elf32_bed 374 #define elf32_bed sparc_elf_vxworks_bed 375 376 #include "elf32-target.h" 377