bfd/elf32-sparc.c

   1 /* SPARC-specific support for 32-bit ELF
   2    Copyright (C) 1993-2017 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         (_("%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
 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
 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
 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_gc_sweep_hook       _bfd_sparc_elf_gc_sweep_hook
 240 #define elf_backend_plt_sym_val         _bfd_sparc_elf_plt_sym_val
 241 #define elf_backend_init_index_section  _bfd_elf_init_1_index_section
 242 #define elf_backend_fixup_symbol        _bfd_sparc_elf_fixup_symbol
 243
 244 #define elf_backend_can_gc_sections 1
 245 #define elf_backend_can_refcount 1
 246 #define elf_backend_want_got_plt 0
 247 #define elf_backend_plt_readonly 0
 248 #define elf_backend_want_plt_sym 1
 249 #define elf_backend_got_header_size 4
 250 #define elf_backend_want_dynrelro 1
 251 #define elf_backend_rela_normal 1
 252
 253 #define elf_backend_add_symbol_hook             elf32_sparc_add_symbol_hook
 254
 255 #include "elf32-target.h"
 256
 257 /* Solaris 2.  */
 258
 259 #undef  TARGET_BIG_SYM
 260 #define TARGET_BIG_SYM                          sparc_elf32_sol2_vec
 261 #undef  TARGET_BIG_NAME
 262 #define TARGET_BIG_NAME                         "elf32-sparc-sol2"
 263
 264 #undef elf32_bed
 265 #define elf32_bed                               elf32_sparc_sol2_bed
 266
 267 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
 268    boundary.  */
 269 #undef  elf_backend_static_tls_alignment
 270 #define elf_backend_static_tls_alignment        8
 271
 272 #undef  elf_backend_strtab_flags
 273 #define elf_backend_strtab_flags        SHF_STRINGS
 274
 275 static bfd_boolean
 276 elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
 277                                                  bfd *obfd ATTRIBUTE_UNUSED,
 278                                                  const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
 279                                                  Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
 280 {
 281   /* PR 19938: FIXME: Need to add code for setting the sh_info
 282      and sh_link fields of Solaris specific section types.  */
 283   return FALSE;
 284 }
 285
 286 #undef  elf_backend_copy_special_section_fields
 287 #define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields
 288
 289 #include "elf32-target.h"
 290
 291 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
 292    the target system as VxWorks.  */
 293
 294 static struct bfd_link_hash_table *
 295 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
 296 {
 297   struct bfd_link_hash_table *ret;
 298
 299   ret = _bfd_sparc_elf_link_hash_table_create (abfd);
 300   if (ret)
 301     {
 302       struct _bfd_sparc_elf_link_hash_table *htab;
 303
 304       htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
 305       htab->is_vxworks = 1;
 306     }
 307   return ret;
 308 }
 309
 310 /* A final_write_processing hook that does both the SPARC- and VxWorks-
 311    specific handling.  */
 312
 313 static void
 314 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
 315 {
 316   elf32_sparc_final_write_processing (abfd, linker);
 317   elf_vxworks_final_write_processing (abfd, linker);
 318 }
 319
 320 #undef  TARGET_BIG_SYM
 321 #define TARGET_BIG_SYM  sparc_elf32_vxworks_vec
 322 #undef  TARGET_BIG_NAME
 323 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
 324
 325 #undef  ELF_MINPAGESIZE
 326 #define ELF_MINPAGESIZE 0x1000
 327
 328 #undef bfd_elf32_bfd_link_hash_table_create
 329 #define bfd_elf32_bfd_link_hash_table_create \
 330   elf32_sparc_vxworks_link_hash_table_create
 331
 332 #undef  elf_backend_want_got_plt
 333 #define elf_backend_want_got_plt                1
 334 #undef  elf_backend_plt_readonly
 335 #define elf_backend_plt_readonly                1
 336 #undef  elf_backend_got_header_size
 337 #define elf_backend_got_header_size             12
 338 #undef  elf_backend_dtrel_excludes_plt
 339 #define elf_backend_dtrel_excludes_plt          1
 340 #undef  elf_backend_add_symbol_hook
 341 #define elf_backend_add_symbol_hook \
 342   elf_vxworks_add_symbol_hook
 343 #undef  elf_backend_link_output_symbol_hook
 344 #define elf_backend_link_output_symbol_hook \
 345   elf_vxworks_link_output_symbol_hook
 346 #undef  elf_backend_emit_relocs
 347 #define elf_backend_emit_relocs \
 348   elf_vxworks_emit_relocs
 349 #undef  elf_backend_final_write_processing
 350 #define elf_backend_final_write_processing \
 351   elf32_sparc_vxworks_final_write_processing
 352 #undef  elf_backend_static_tls_alignment
 353 #undef  elf_backend_strtab_flags
 354 #undef  elf_backend_copy_special_section_fields
 355
 356 #undef  elf32_bed
 357 #define elf32_bed                               sparc_elf_vxworks_bed
 358
 359 #include "elf32-target.h"