bfd/elf32-sparc.c

   1 /* SPARC-specific support for 32-bit ELF
   2    Copyright (C) 1993-2016 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, bfd *obfd)
  71 {
  72   bfd_boolean error;
  73   unsigned long ibfd_mach;
  74   /* FIXME: This should not be static.  */
  75   static unsigned long previous_ibfd_e_flags = (unsigned long) -1;
  76
  77   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
  78       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
  79     return TRUE;
  80
  81   error = FALSE;
  82
  83   ibfd_mach = bfd_get_mach (ibfd);
  84   if (bfd_mach_sparc_64bit_p (ibfd_mach))
  85     {
  86       error = TRUE;
  87       (*_bfd_error_handler)
  88         (_("%B: compiled for a 64 bit system and target is 32 bit"), ibfd);
  89     }
  90   else if ((ibfd->flags & DYNAMIC) == 0)
  91     {
  92       if (bfd_get_mach (obfd) < ibfd_mach)
  93         bfd_set_arch_mach (obfd, bfd_arch_sparc, ibfd_mach);
  94     }
  95
  96   if (((elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA)
  97        != previous_ibfd_e_flags)
  98       && previous_ibfd_e_flags != (unsigned long) -1)
  99     {
 100       (*_bfd_error_handler)
 101         (_("%B: linking little endian files with big endian files"), ibfd);
 102       error = TRUE;
 103     }
 104   previous_ibfd_e_flags = elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA;
 105
 106   if (error)
 107     {
 108       bfd_set_error (bfd_error_bad_value);
 109       return FALSE;
 110     }
 111
 112   return _bfd_sparc_elf_merge_private_bfd_data (ibfd, obfd);
 113 }
 114
 115 /* The final processing done just before writing out the object file.
 116    We need to set the e_machine field appropriately.  */
 117
 118 static void
 119 elf32_sparc_final_write_processing (bfd *abfd,
 120                                     bfd_boolean linker ATTRIBUTE_UNUSED)
 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       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
 145       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
 146       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
 147                                        | EF_SPARC_SUN_US3;
 148       break;
 149     case bfd_mach_sparc_sparclite_le :
 150       elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
 151       break;
 152     default :
 153       abort ();
 154       break;
 155     }
 156 }
 157
 158 static enum elf_reloc_type_class
 159 elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
 160                               const asection *rel_sec ATTRIBUTE_UNUSED,
 161                               const Elf_Internal_Rela *rela)
 162 {
 163   switch ((int) ELF32_R_TYPE (rela->r_info))
 164     {
 165     case R_SPARC_RELATIVE:
 166       return reloc_class_relative;
 167     case R_SPARC_JMP_SLOT:
 168       return reloc_class_plt;
 169     case R_SPARC_COPY:
 170       return reloc_class_copy;
 171     default:
 172       return reloc_class_normal;
 173     }
 174 }
 175
 176 /* Hook called by the linker routine which adds symbols from an object
 177    file.  */
 178
 179 static bfd_boolean
 180 elf32_sparc_add_symbol_hook (bfd * abfd,
 181                              struct bfd_link_info * info,
 182                              Elf_Internal_Sym * sym,
 183                              const char ** namep ATTRIBUTE_UNUSED,
 184                              flagword * flagsp ATTRIBUTE_UNUSED,
 185                              asection ** secp ATTRIBUTE_UNUSED,
 186                              bfd_vma * valp ATTRIBUTE_UNUSED)
 187 {
 188   if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 189       && (abfd->flags & DYNAMIC) == 0
 190       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 191     elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
 192   return TRUE;
 193 }
 194
 195 #define TARGET_BIG_SYM  sparc_elf32_vec
 196 #define TARGET_BIG_NAME "elf32-sparc"
 197 #define ELF_ARCH        bfd_arch_sparc
 198 #define ELF_TARGET_ID   SPARC_ELF_DATA
 199 #define ELF_MACHINE_CODE EM_SPARC
 200 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS
 201 #define ELF_MAXPAGESIZE 0x10000
 202 #define ELF_COMMONPAGESIZE 0x2000
 203
 204 #define bfd_elf32_bfd_merge_private_bfd_data \
 205                                         elf32_sparc_merge_private_bfd_data
 206 #define elf_backend_final_write_processing \
 207                                         elf32_sparc_final_write_processing
 208 #define elf_backend_grok_psinfo         elf32_sparc_grok_psinfo
 209 #define elf_backend_reloc_type_class    elf32_sparc_reloc_type_class
 210
 211 #define elf_info_to_howto               _bfd_sparc_elf_info_to_howto
 212 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
 213 #define bfd_elf32_bfd_reloc_name_lookup \
 214   _bfd_sparc_elf_reloc_name_lookup
 215 #define bfd_elf32_bfd_link_hash_table_create \
 216                                         _bfd_sparc_elf_link_hash_table_create
 217 #define bfd_elf32_bfd_relax_section     _bfd_sparc_elf_relax_section
 218 #define bfd_elf32_new_section_hook      _bfd_sparc_elf_new_section_hook
 219 #define elf_backend_copy_indirect_symbol \
 220                                         _bfd_sparc_elf_copy_indirect_symbol
 221 #define elf_backend_create_dynamic_sections \
 222                                         _bfd_sparc_elf_create_dynamic_sections
 223 #define elf_backend_check_relocs        _bfd_sparc_elf_check_relocs
 224 #define elf_backend_adjust_dynamic_symbol \
 225                                         _bfd_sparc_elf_adjust_dynamic_symbol
 226 #define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym
 227 #define elf_backend_size_dynamic_sections \
 228                                         _bfd_sparc_elf_size_dynamic_sections
 229 #define elf_backend_relocate_section    _bfd_sparc_elf_relocate_section
 230 #define elf_backend_finish_dynamic_symbol \
 231                                         _bfd_sparc_elf_finish_dynamic_symbol
 232 #define elf_backend_finish_dynamic_sections \
 233                                         _bfd_sparc_elf_finish_dynamic_sections
 234 #define bfd_elf32_mkobject              _bfd_sparc_elf_mkobject
 235 #define elf_backend_object_p            _bfd_sparc_elf_object_p
 236 #define elf_backend_gc_mark_hook        _bfd_sparc_elf_gc_mark_hook
 237 #define elf_backend_gc_sweep_hook       _bfd_sparc_elf_gc_sweep_hook
 238 #define elf_backend_plt_sym_val         _bfd_sparc_elf_plt_sym_val
 239 #define elf_backend_init_index_section  _bfd_elf_init_1_index_section
 240
 241 #define elf_backend_can_gc_sections 1
 242 #define elf_backend_can_refcount 1
 243 #define elf_backend_want_got_plt 0
 244 #define elf_backend_plt_readonly 0
 245 #define elf_backend_want_plt_sym 1
 246 #define elf_backend_got_header_size 4
 247 #define elf_backend_rela_normal 1
 248
 249 #define elf_backend_add_symbol_hook             elf32_sparc_add_symbol_hook
 250
 251 #include "elf32-target.h"
 252
 253 /* Solaris 2.  */
 254
 255 #undef  TARGET_BIG_SYM
 256 #define TARGET_BIG_SYM                          sparc_elf32_sol2_vec
 257 #undef  TARGET_BIG_NAME
 258 #define TARGET_BIG_NAME                         "elf32-sparc-sol2"
 259
 260 #undef elf32_bed
 261 #define elf32_bed                               elf32_sparc_sol2_bed
 262
 263 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
 264    boundary.  */
 265 #undef  elf_backend_static_tls_alignment
 266 #define elf_backend_static_tls_alignment        8
 267
 268 #undef  elf_backend_strtab_flags
 269 #define elf_backend_strtab_flags        SHF_STRINGS
 270
 271 static bfd_boolean
 272 elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
 273                                                  bfd *obfd ATTRIBUTE_UNUSED,
 274                                                  const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
 275                                                  Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
 276 {
 277   /* PR 19938: FIXME: Need to add code for setting the sh_info
 278      and sh_link fields of Solaris specific section types.  */
 279   return FALSE;
 280 }
 281
 282 #undef  elf_backend_copy_special_section_fields
 283 #define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields
 284
 285 #include "elf32-target.h"
 286
 287 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
 288    the target system as VxWorks.  */
 289
 290 static struct bfd_link_hash_table *
 291 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
 292 {
 293   struct bfd_link_hash_table *ret;
 294
 295   ret = _bfd_sparc_elf_link_hash_table_create (abfd);
 296   if (ret)
 297     {
 298       struct _bfd_sparc_elf_link_hash_table *htab;
 299
 300       htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
 301       htab->is_vxworks = 1;
 302     }
 303   return ret;
 304 }
 305
 306 /* A final_write_processing hook that does both the SPARC- and VxWorks-
 307    specific handling.  */
 308
 309 static void
 310 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
 311 {
 312   elf32_sparc_final_write_processing (abfd, linker);
 313   elf_vxworks_final_write_processing (abfd, linker);
 314 }
 315
 316 #undef  TARGET_BIG_SYM
 317 #define TARGET_BIG_SYM  sparc_elf32_vxworks_vec
 318 #undef  TARGET_BIG_NAME
 319 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
 320
 321 #undef  ELF_MINPAGESIZE
 322 #define ELF_MINPAGESIZE 0x1000
 323
 324 #undef bfd_elf32_bfd_link_hash_table_create
 325 #define bfd_elf32_bfd_link_hash_table_create \
 326   elf32_sparc_vxworks_link_hash_table_create
 327
 328 #undef  elf_backend_want_got_plt
 329 #define elf_backend_want_got_plt                1
 330 #undef  elf_backend_plt_readonly
 331 #define elf_backend_plt_readonly                1
 332 #undef  elf_backend_got_header_size
 333 #define elf_backend_got_header_size             12
 334 #undef  elf_backend_add_symbol_hook
 335 #define elf_backend_add_symbol_hook \
 336   elf_vxworks_add_symbol_hook
 337 #undef  elf_backend_link_output_symbol_hook
 338 #define elf_backend_link_output_symbol_hook \
 339   elf_vxworks_link_output_symbol_hook
 340 #undef  elf_backend_emit_relocs
 341 #define elf_backend_emit_relocs \
 342   elf_vxworks_emit_relocs
 343 #undef  elf_backend_final_write_processing
 344 #define elf_backend_final_write_processing \
 345   elf32_sparc_vxworks_final_write_processing
 346 #undef  elf_backend_static_tls_alignment
 347 #undef  elf_backend_strtab_flags
 348 #undef  elf_backend_copy_special_section_fields
 349
 350 #undef  elf32_bed
 351 #define elf32_bed                               sparc_elf_vxworks_bed
 352
 353 #include "elf32-target.h"