bfd/elf32-sparc.c

   1 /* SPARC-specific support for 32-bit ELF
   2    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2006, 2007, 2010 Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "bfdlink.h"
  25 #include "libbfd.h"
  26 #include "elf-bfd.h"
  27 #include "elf/sparc.h"
  28 #include "opcode/sparc.h"
  29 #include "elfxx-sparc.h"
  30 #include "elf-vxworks.h"
  31
  32 /* Support for core dump NOTE sections.  */
  33
  34 static bfd_boolean
  35 elf32_sparc_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
  36 {
  37   switch (note->descsz)
  38     {
  39     default:
  40       return FALSE;
  41
  42     case 260:                   /* Solaris prpsinfo_t.  */
  43       elf_tdata (abfd)->core_program
  44         = _bfd_elfcore_strndup (abfd, note->descdata + 84, 16);
  45       elf_tdata (abfd)->core_command
  46         = _bfd_elfcore_strndup (abfd, note->descdata + 100, 80);
  47       break;
  48
  49     case 336:                   /* Solaris psinfo_t.  */
  50       elf_tdata (abfd)->core_program
  51         = _bfd_elfcore_strndup (abfd, note->descdata + 88, 16);
  52       elf_tdata (abfd)->core_command
  53         = _bfd_elfcore_strndup (abfd, note->descdata + 104, 80);
  54       break;
  55     }
  56
  57   return TRUE;
  58 }
  59
  60 /* Functions for dealing with the e_flags field.
  61
  62    We don't define set_private_flags or copy_private_bfd_data because
  63    the only currently defined values are based on the bfd mach number,
  64    so we use the latter instead and defer setting e_flags until the
  65    file is written out.  */
  66
  67 /* Merge backend specific data from an object file to the output
  68    object file when linking.  */
  69
  70 static bfd_boolean
  71 elf32_sparc_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
  72 {
  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 TRUE;
 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       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
 141       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
 142       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
 143                                        | EF_SPARC_SUN_US3;
 144       break;
 145     case bfd_mach_sparc_sparclite_le :
 146       elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
 147       break;
 148     default :
 149       abort ();
 150       break;
 151     }
 152 }
 153
 154 static enum elf_reloc_type_class
 155 elf32_sparc_reloc_type_class (const Elf_Internal_Rela *rela)
 156 {
 157   switch ((int) ELF32_R_TYPE (rela->r_info))
 158     {
 159     case R_SPARC_RELATIVE:
 160       return reloc_class_relative;
 161     case R_SPARC_JMP_SLOT:
 162       return reloc_class_plt;
 163     case R_SPARC_COPY:
 164       return reloc_class_copy;
 165     default:
 166       return reloc_class_normal;
 167     }
 168 }
 169
 170 /* Hook called by the linker routine which adds symbols from an object
 171    file.  */
 172
 173 static bfd_boolean
 174 elf32_sparc_add_symbol_hook (bfd * abfd,
 175                              struct bfd_link_info * info ATTRIBUTE_UNUSED,
 176                              Elf_Internal_Sym * sym,
 177                              const char ** namep ATTRIBUTE_UNUSED,
 178                              flagword * flagsp ATTRIBUTE_UNUSED,
 179                              asection ** secp ATTRIBUTE_UNUSED,
 180                              bfd_vma * valp ATTRIBUTE_UNUSED)
 181 {
 182   if ((abfd->flags & DYNAMIC) == 0
 183       && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 184           || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
 185     elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
 186   return TRUE;
 187 }
 188
 189 #define TARGET_BIG_SYM  bfd_elf32_sparc_vec
 190 #define TARGET_BIG_NAME "elf32-sparc"
 191 #define ELF_ARCH        bfd_arch_sparc
 192 #define ELF_TARGET_ID   SPARC_ELF_DATA
 193 #define ELF_MACHINE_CODE EM_SPARC
 194 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS
 195 #define ELF_MAXPAGESIZE 0x10000
 196 #define ELF_COMMONPAGESIZE 0x2000
 197
 198 #define bfd_elf32_bfd_merge_private_bfd_data \
 199                                         elf32_sparc_merge_private_bfd_data
 200 #define elf_backend_final_write_processing \
 201                                         elf32_sparc_final_write_processing
 202 #define elf_backend_grok_psinfo         elf32_sparc_grok_psinfo
 203 #define elf_backend_reloc_type_class    elf32_sparc_reloc_type_class
 204
 205 #define elf_info_to_howto               _bfd_sparc_elf_info_to_howto
 206 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
 207 #define bfd_elf32_bfd_reloc_name_lookup \
 208   _bfd_sparc_elf_reloc_name_lookup
 209 #define bfd_elf32_bfd_link_hash_table_create \
 210                                         _bfd_sparc_elf_link_hash_table_create
 211 #define bfd_elf32_bfd_link_hash_table_free \
 212                                         _bfd_sparc_elf_link_hash_table_free
 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_post_process_headers        _bfd_elf_set_osabi
 246 #define elf_backend_add_symbol_hook             elf32_sparc_add_symbol_hook
 247
 248 #include "elf32-target.h"
 249
 250 /* Solaris 2.  */
 251
 252 #undef  TARGET_BIG_SYM
 253 #define TARGET_BIG_SYM                          bfd_elf32_sparc_sol2_vec
 254 #undef  TARGET_BIG_NAME
 255 #define TARGET_BIG_NAME                         "elf32-sparc-sol2"
 256
 257 #undef elf32_bed
 258 #define elf32_bed                               elf32_sparc_sol2_bed
 259
 260 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
 261    boundary.  */
 262 #undef elf_backend_static_tls_alignment
 263 #define elf_backend_static_tls_alignment        8
 264
 265 #include "elf32-target.h"
 266
 267 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
 268    the target system as VxWorks.  */
 269
 270 static struct bfd_link_hash_table *
 271 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
 272 {
 273   struct bfd_link_hash_table *ret;
 274
 275   ret = _bfd_sparc_elf_link_hash_table_create (abfd);
 276   if (ret)
 277     {
 278       struct _bfd_sparc_elf_link_hash_table *htab;
 279
 280       htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
 281       htab->is_vxworks = 1;
 282     }
 283   return ret;
 284 }
 285
 286 /* A final_write_processing hook that does both the SPARC- and VxWorks-
 287    specific handling.  */
 288
 289 static void
 290 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
 291 {
 292   elf32_sparc_final_write_processing (abfd, linker);
 293   elf_vxworks_final_write_processing (abfd, linker);
 294 }
 295
 296 #undef TARGET_BIG_SYM
 297 #define TARGET_BIG_SYM  bfd_elf32_sparc_vxworks_vec
 298 #undef TARGET_BIG_NAME
 299 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
 300
 301 #undef ELF_MINPAGESIZE
 302 #define ELF_MINPAGESIZE 0x1000
 303
 304 #undef bfd_elf32_bfd_link_hash_table_create
 305 #define bfd_elf32_bfd_link_hash_table_create \
 306   elf32_sparc_vxworks_link_hash_table_create
 307
 308 #undef elf_backend_want_got_plt
 309 #define elf_backend_want_got_plt                1
 310 #undef elf_backend_plt_readonly
 311 #define elf_backend_plt_readonly                1
 312 #undef elf_backend_got_header_size
 313 #define elf_backend_got_header_size             12
 314 #undef elf_backend_add_symbol_hook
 315 #define elf_backend_add_symbol_hook \
 316   elf_vxworks_add_symbol_hook
 317 #undef elf_backend_link_output_symbol_hook
 318 #define elf_backend_link_output_symbol_hook \
 319   elf_vxworks_link_output_symbol_hook
 320 #undef elf_backend_emit_relocs
 321 #define elf_backend_emit_relocs \
 322   elf_vxworks_emit_relocs
 323 #undef elf_backend_final_write_processing
 324 #define elf_backend_final_write_processing \
 325   elf32_sparc_vxworks_final_write_processing
 326 #undef elf_backend_static_tls_alignment
 327
 328 #undef elf32_bed
 329 #define elf32_bed                               sparc_elf_vxworks_bed
 330
 331 #include "elf32-target.h"