bfd/elf32-sparc.c

   1 /* SPARC-specific support for 32-bit ELF
   2    Copyright (C) 1993-2019 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 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 /* Used to decide how to sort relocs in an optimal manner for the
 161    dynamic linker, before writing them out.  */
 162
 163 static enum elf_reloc_type_class
 164 elf32_sparc_reloc_type_class (const struct bfd_link_info *info,
 165                               const asection *rel_sec ATTRIBUTE_UNUSED,
 166                               const Elf_Internal_Rela *rela)
 167 {
 168   bfd *abfd = info->output_bfd;
 169   const struct elf_backend_data *bed = get_elf_backend_data (abfd);
 170   struct _bfd_sparc_elf_link_hash_table *htab
 171     = _bfd_sparc_elf_hash_table (info);
 172   BFD_ASSERT (htab != NULL);
 173
 174   if (htab->elf.dynsym != NULL
 175       && htab->elf.dynsym->contents != NULL)
 176     {
 177       /* Check relocation against STT_GNU_IFUNC symbol if there are
 178          dynamic symbols.  */
 179       unsigned long r_symndx = htab->r_symndx (rela->r_info);
 180       if (r_symndx != STN_UNDEF)
 181         {
 182           Elf_Internal_Sym sym;
 183           if (!bed->s->swap_symbol_in (abfd,
 184                                        (htab->elf.dynsym->contents
 185                                         + r_symndx * bed->s->sizeof_sym),
 186                                        0, &sym))
 187             abort ();
 188
 189           if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
 190             return reloc_class_ifunc;
 191         }
 192     }
 193
 194   switch ((int) ELF32_R_TYPE (rela->r_info))
 195     {
 196     case R_SPARC_IRELATIVE:
 197       return reloc_class_ifunc;
 198     case R_SPARC_RELATIVE:
 199       return reloc_class_relative;
 200     case R_SPARC_JMP_SLOT:
 201       return reloc_class_plt;
 202     case R_SPARC_COPY:
 203       return reloc_class_copy;
 204     default:
 205       return reloc_class_normal;
 206     }
 207 }
 208
 209 #define TARGET_BIG_SYM  sparc_elf32_vec
 210 #define TARGET_BIG_NAME "elf32-sparc"
 211 #define ELF_ARCH        bfd_arch_sparc
 212 #define ELF_TARGET_ID   SPARC_ELF_DATA
 213 #define ELF_MACHINE_CODE EM_SPARC
 214 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS
 215 #define ELF_MAXPAGESIZE 0x10000
 216 #define ELF_COMMONPAGESIZE 0x2000
 217
 218 #define bfd_elf32_bfd_merge_private_bfd_data \
 219                                         elf32_sparc_merge_private_bfd_data
 220 #define elf_backend_final_write_processing \
 221                                         elf32_sparc_final_write_processing
 222 #define elf_backend_grok_psinfo         elf32_sparc_grok_psinfo
 223 #define elf_backend_reloc_type_class    elf32_sparc_reloc_type_class
 224
 225 #define elf_info_to_howto               _bfd_sparc_elf_info_to_howto
 226 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
 227 #define bfd_elf32_bfd_reloc_name_lookup \
 228   _bfd_sparc_elf_reloc_name_lookup
 229 #define bfd_elf32_bfd_link_hash_table_create \
 230                                         _bfd_sparc_elf_link_hash_table_create
 231 #define bfd_elf32_bfd_relax_section     _bfd_sparc_elf_relax_section
 232 #define bfd_elf32_new_section_hook      _bfd_sparc_elf_new_section_hook
 233 #define elf_backend_copy_indirect_symbol \
 234                                         _bfd_sparc_elf_copy_indirect_symbol
 235 #define elf_backend_create_dynamic_sections \
 236                                         _bfd_sparc_elf_create_dynamic_sections
 237 #define elf_backend_check_relocs        _bfd_sparc_elf_check_relocs
 238 #define elf_backend_adjust_dynamic_symbol \
 239                                         _bfd_sparc_elf_adjust_dynamic_symbol
 240 #define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym
 241 #define elf_backend_size_dynamic_sections \
 242                                         _bfd_sparc_elf_size_dynamic_sections
 243 #define elf_backend_relocate_section    _bfd_sparc_elf_relocate_section
 244 #define elf_backend_finish_dynamic_symbol \
 245                                         _bfd_sparc_elf_finish_dynamic_symbol
 246 #define elf_backend_finish_dynamic_sections \
 247                                         _bfd_sparc_elf_finish_dynamic_sections
 248 #define bfd_elf32_mkobject              _bfd_sparc_elf_mkobject
 249 #define elf_backend_object_p            _bfd_sparc_elf_object_p
 250 #define elf_backend_gc_mark_hook        _bfd_sparc_elf_gc_mark_hook
 251 #define elf_backend_plt_sym_val         _bfd_sparc_elf_plt_sym_val
 252 #define elf_backend_init_index_section  _bfd_elf_init_1_index_section
 253 #define elf_backend_fixup_symbol        _bfd_sparc_elf_fixup_symbol
 254
 255 #define elf_backend_can_gc_sections 1
 256 #define elf_backend_can_refcount 1
 257 #define elf_backend_want_got_plt 0
 258 #define elf_backend_plt_readonly 0
 259 #define elf_backend_want_plt_sym 1
 260 #define elf_backend_got_header_size 4
 261 #define elf_backend_want_dynrelro 1
 262 #define elf_backend_rela_normal 1
 263
 264 #define elf_backend_linux_prpsinfo32_ugid16     TRUE
 265
 266 #include "elf32-target.h"
 267
 268 /* Solaris 2.  */
 269
 270 #undef  TARGET_BIG_SYM
 271 #define TARGET_BIG_SYM                          sparc_elf32_sol2_vec
 272 #undef  TARGET_BIG_NAME
 273 #define TARGET_BIG_NAME                         "elf32-sparc-sol2"
 274
 275 #undef elf32_bed
 276 #define elf32_bed                               elf32_sparc_sol2_bed
 277
 278 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
 279    boundary.  */
 280 #undef  elf_backend_static_tls_alignment
 281 #define elf_backend_static_tls_alignment        8
 282
 283 #undef  elf_backend_strtab_flags
 284 #define elf_backend_strtab_flags        SHF_STRINGS
 285
 286 static bfd_boolean
 287 elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
 288                                                  bfd *obfd ATTRIBUTE_UNUSED,
 289                                                  const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
 290                                                  Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
 291 {
 292   /* PR 19938: FIXME: Need to add code for setting the sh_info
 293      and sh_link fields of Solaris specific section types.  */
 294   return FALSE;
 295 }
 296
 297 #undef  elf_backend_copy_special_section_fields
 298 #define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields
 299
 300 #include "elf32-target.h"
 301
 302 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
 303    the target system as VxWorks.  */
 304
 305 static struct bfd_link_hash_table *
 306 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
 307 {
 308   struct bfd_link_hash_table *ret;
 309
 310   ret = _bfd_sparc_elf_link_hash_table_create (abfd);
 311   if (ret)
 312     {
 313       struct _bfd_sparc_elf_link_hash_table *htab;
 314
 315       htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
 316       htab->is_vxworks = 1;
 317     }
 318   return ret;
 319 }
 320
 321 /* A final_write_processing hook that does both the SPARC- and VxWorks-
 322    specific handling.  */
 323
 324 static void
 325 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
 326 {
 327   elf32_sparc_final_write_processing (abfd, linker);
 328   elf_vxworks_final_write_processing (abfd, linker);
 329 }
 330
 331 #undef  TARGET_BIG_SYM
 332 #define TARGET_BIG_SYM  sparc_elf32_vxworks_vec
 333 #undef  TARGET_BIG_NAME
 334 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
 335
 336 #undef  ELF_MINPAGESIZE
 337 #define ELF_MINPAGESIZE 0x1000
 338
 339 #undef bfd_elf32_bfd_link_hash_table_create
 340 #define bfd_elf32_bfd_link_hash_table_create \
 341   elf32_sparc_vxworks_link_hash_table_create
 342
 343 #undef  elf_backend_want_got_plt
 344 #define elf_backend_want_got_plt                1
 345 #undef  elf_backend_plt_readonly
 346 #define elf_backend_plt_readonly                1
 347 #undef  elf_backend_got_header_size
 348 #define elf_backend_got_header_size             12
 349 #undef  elf_backend_dtrel_excludes_plt
 350 #define elf_backend_dtrel_excludes_plt          1
 351 #undef  elf_backend_add_symbol_hook
 352 #define elf_backend_add_symbol_hook \
 353   elf_vxworks_add_symbol_hook
 354 #undef  elf_backend_link_output_symbol_hook
 355 #define elf_backend_link_output_symbol_hook \
 356   elf_vxworks_link_output_symbol_hook
 357 #undef  elf_backend_emit_relocs
 358 #define elf_backend_emit_relocs \
 359   elf_vxworks_emit_relocs
 360 #undef  elf_backend_final_write_processing
 361 #define elf_backend_final_write_processing \
 362   elf32_sparc_vxworks_final_write_processing
 363 #undef  elf_backend_static_tls_alignment
 364 #undef  elf_backend_strtab_flags
 365 #undef  elf_backend_copy_special_section_fields
 366
 367 #undef  elf32_bed
 368 #define elf32_bed                               sparc_elf_vxworks_bed
 369
 370 #include "elf32-target.h"