bfd/elf32-sparc.c

   1 /* SPARC-specific support for 32-bit ELF
   2    Copyright (C) 1993-2015 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       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
 140       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
 141       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
 142                                        | EF_SPARC_SUN_US3;
 143       break;
 144     case bfd_mach_sparc_sparclite_le :
 145       elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
 146       break;
 147     default :
 148       abort ();
 149       break;
 150     }
 151 }
 152
 153 static enum elf_reloc_type_class
 154 elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
 155                               const asection *rel_sec ATTRIBUTE_UNUSED,
 156                               const Elf_Internal_Rela *rela)
 157 {
 158   switch ((int) ELF32_R_TYPE (rela->r_info))
 159     {
 160     case R_SPARC_RELATIVE:
 161       return reloc_class_relative;
 162     case R_SPARC_JMP_SLOT:
 163       return reloc_class_plt;
 164     case R_SPARC_COPY:
 165       return reloc_class_copy;
 166     default:
 167       return reloc_class_normal;
 168     }
 169 }
 170
 171 /* Hook called by the linker routine which adds symbols from an object
 172    file.  */
 173
 174 static bfd_boolean
 175 elf32_sparc_add_symbol_hook (bfd * abfd,
 176                              struct bfd_link_info * info,
 177                              Elf_Internal_Sym * sym,
 178                              const char ** namep ATTRIBUTE_UNUSED,
 179                              flagword * flagsp ATTRIBUTE_UNUSED,
 180                              asection ** secp ATTRIBUTE_UNUSED,
 181                              bfd_vma * valp ATTRIBUTE_UNUSED)
 182 {
 183   if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 184        || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
 185       && (abfd->flags & DYNAMIC) == 0
 186       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 187     elf_tdata (info->output_bfd)->has_gnu_symbols = elf_gnu_symbol_any;
 188   return TRUE;
 189 }
 190
 191 #define TARGET_BIG_SYM  sparc_elf32_vec
 192 #define TARGET_BIG_NAME "elf32-sparc"
 193 #define ELF_ARCH        bfd_arch_sparc
 194 #define ELF_TARGET_ID   SPARC_ELF_DATA
 195 #define ELF_MACHINE_CODE EM_SPARC
 196 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS
 197 #define ELF_MAXPAGESIZE 0x10000
 198 #define ELF_COMMONPAGESIZE 0x2000
 199
 200 #define bfd_elf32_bfd_merge_private_bfd_data \
 201                                         elf32_sparc_merge_private_bfd_data
 202 #define elf_backend_final_write_processing \
 203                                         elf32_sparc_final_write_processing
 204 #define elf_backend_grok_psinfo         elf32_sparc_grok_psinfo
 205 #define elf_backend_reloc_type_class    elf32_sparc_reloc_type_class
 206
 207 #define elf_info_to_howto               _bfd_sparc_elf_info_to_howto
 208 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
 209 #define bfd_elf32_bfd_reloc_name_lookup \
 210   _bfd_sparc_elf_reloc_name_lookup
 211 #define bfd_elf32_bfd_link_hash_table_create \
 212                                         _bfd_sparc_elf_link_hash_table_create
 213 #define bfd_elf32_bfd_relax_section     _bfd_sparc_elf_relax_section
 214 #define bfd_elf32_new_section_hook      _bfd_sparc_elf_new_section_hook
 215 #define elf_backend_copy_indirect_symbol \
 216                                         _bfd_sparc_elf_copy_indirect_symbol
 217 #define elf_backend_create_dynamic_sections \
 218                                         _bfd_sparc_elf_create_dynamic_sections
 219 #define elf_backend_check_relocs        _bfd_sparc_elf_check_relocs
 220 #define elf_backend_adjust_dynamic_symbol \
 221                                         _bfd_sparc_elf_adjust_dynamic_symbol
 222 #define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym
 223 #define elf_backend_size_dynamic_sections \
 224                                         _bfd_sparc_elf_size_dynamic_sections
 225 #define elf_backend_relocate_section    _bfd_sparc_elf_relocate_section
 226 #define elf_backend_finish_dynamic_symbol \
 227                                         _bfd_sparc_elf_finish_dynamic_symbol
 228 #define elf_backend_finish_dynamic_sections \
 229                                         _bfd_sparc_elf_finish_dynamic_sections
 230 #define bfd_elf32_mkobject              _bfd_sparc_elf_mkobject
 231 #define elf_backend_object_p            _bfd_sparc_elf_object_p
 232 #define elf_backend_gc_mark_hook        _bfd_sparc_elf_gc_mark_hook
 233 #define elf_backend_gc_sweep_hook       _bfd_sparc_elf_gc_sweep_hook
 234 #define elf_backend_plt_sym_val         _bfd_sparc_elf_plt_sym_val
 235 #define elf_backend_init_index_section  _bfd_elf_init_1_index_section
 236
 237 #define elf_backend_can_gc_sections 1
 238 #define elf_backend_can_refcount 1
 239 #define elf_backend_want_got_plt 0
 240 #define elf_backend_plt_readonly 0
 241 #define elf_backend_want_plt_sym 1
 242 #define elf_backend_got_header_size 4
 243 #define elf_backend_rela_normal 1
 244
 245 #define elf_backend_add_symbol_hook             elf32_sparc_add_symbol_hook
 246
 247 #include "elf32-target.h"
 248
 249 /* Solaris 2.  */
 250
 251 #undef  TARGET_BIG_SYM
 252 #define TARGET_BIG_SYM                          sparc_elf32_sol2_vec
 253 #undef  TARGET_BIG_NAME
 254 #define TARGET_BIG_NAME                         "elf32-sparc-sol2"
 255
 256 #undef elf32_bed
 257 #define elf32_bed                               elf32_sparc_sol2_bed
 258
 259 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
 260    boundary.  */
 261 #undef elf_backend_static_tls_alignment
 262 #define elf_backend_static_tls_alignment        8
 263
 264 #include "elf32-target.h"
 265
 266 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
 267    the target system as VxWorks.  */
 268
 269 static struct bfd_link_hash_table *
 270 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
 271 {
 272   struct bfd_link_hash_table *ret;
 273
 274   ret = _bfd_sparc_elf_link_hash_table_create (abfd);
 275   if (ret)
 276     {
 277       struct _bfd_sparc_elf_link_hash_table *htab;
 278
 279       htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
 280       htab->is_vxworks = 1;
 281     }
 282   return ret;
 283 }
 284
 285 /* A final_write_processing hook that does both the SPARC- and VxWorks-
 286    specific handling.  */
 287
 288 static void
 289 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
 290 {
 291   elf32_sparc_final_write_processing (abfd, linker);
 292   elf_vxworks_final_write_processing (abfd, linker);
 293 }
 294
 295 #undef TARGET_BIG_SYM
 296 #define TARGET_BIG_SYM  sparc_elf32_vxworks_vec
 297 #undef TARGET_BIG_NAME
 298 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
 299
 300 #undef ELF_MINPAGESIZE
 301 #define ELF_MINPAGESIZE 0x1000
 302
 303 #undef bfd_elf32_bfd_link_hash_table_create
 304 #define bfd_elf32_bfd_link_hash_table_create \
 305   elf32_sparc_vxworks_link_hash_table_create
 306
 307 #undef elf_backend_want_got_plt
 308 #define elf_backend_want_got_plt                1
 309 #undef elf_backend_plt_readonly
 310 #define elf_backend_plt_readonly                1
 311 #undef elf_backend_got_header_size
 312 #define elf_backend_got_header_size             12
 313 #undef elf_backend_add_symbol_hook
 314 #define elf_backend_add_symbol_hook \
 315   elf_vxworks_add_symbol_hook
 316 #undef elf_backend_link_output_symbol_hook
 317 #define elf_backend_link_output_symbol_hook \
 318   elf_vxworks_link_output_symbol_hook
 319 #undef elf_backend_emit_relocs
 320 #define elf_backend_emit_relocs \
 321   elf_vxworks_emit_relocs
 322 #undef elf_backend_final_write_processing
 323 #define elf_backend_final_write_processing \
 324   elf32_sparc_vxworks_final_write_processing
 325 #undef elf_backend_static_tls_alignment
 326
 327 #undef elf32_bed
 328 #define elf32_bed                               sparc_elf_vxworks_bed
 329
 330 #include "elf32-target.h"