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, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "bfdlink.h"
  26 #include "libbfd.h"
  27 #include "elf-bfd.h"
  28 #include "elf/sparc.h"
  29 #include "opcode/sparc.h"
  30 #include "elfxx-sparc.h"
  31 #include "elf-vxworks.h"
  32
  33 /* Support for core dump NOTE sections.  */
  34
  35 static bfd_boolean
  36 elf32_sparc_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
  37 {
  38   switch (note->descsz)
  39     {
  40     default:
  41       return FALSE;
  42
  43     case 260:                   /* Solaris prpsinfo_t.  */
  44       elf_tdata (abfd)->core_program
  45         = _bfd_elfcore_strndup (abfd, note->descdata + 84, 16);
  46       elf_tdata (abfd)->core_command
  47         = _bfd_elfcore_strndup (abfd, note->descdata + 100, 80);
  48       break;
  49
  50     case 336:                   /* Solaris psinfo_t.  */
  51       elf_tdata (abfd)->core_program
  52         = _bfd_elfcore_strndup (abfd, note->descdata + 88, 16);
  53       elf_tdata (abfd)->core_command
  54         = _bfd_elfcore_strndup (abfd, note->descdata + 104, 80);
  55       break;
  56     }
  57
  58   return TRUE;
  59 }
  60
  61 /* Functions for dealing with the e_flags field.
  62
  63    We don't define set_private_flags or copy_private_bfd_data because
  64    the only currently defined values are based on the bfd mach number,
  65    so we use the latter instead and defer setting e_flags until the
  66    file is written out.  */
  67
  68 /* Merge backend specific data from an object file to the output
  69    object file when linking.  */
  70
  71 static bfd_boolean
  72 elf32_sparc_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
  73 {
  74   bfd_boolean error;
  75   unsigned long ibfd_mach;
  76   /* FIXME: This should not be static.  */
  77   static unsigned long previous_ibfd_e_flags = (unsigned long) -1;
  78
  79   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
  80       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
  81     return TRUE;
  82
  83   error = FALSE;
  84
  85   ibfd_mach = bfd_get_mach (ibfd);
  86   if (bfd_mach_sparc_64bit_p (ibfd_mach))
  87     {
  88       error = TRUE;
  89       (*_bfd_error_handler)
  90         (_("%B: compiled for a 64 bit system and target is 32 bit"), ibfd);
  91     }
  92   else if ((ibfd->flags & DYNAMIC) == 0)
  93     {
  94       if (bfd_get_mach (obfd) < ibfd_mach)
  95         bfd_set_arch_mach (obfd, bfd_arch_sparc, ibfd_mach);
  96     }
  97
  98   if (((elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA)
  99        != previous_ibfd_e_flags)
 100       && previous_ibfd_e_flags != (unsigned long) -1)
 101     {
 102       (*_bfd_error_handler)
 103         (_("%B: linking little endian files with big endian files"), ibfd);
 104       error = TRUE;
 105     }
 106   previous_ibfd_e_flags = elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA;
 107
 108   if (error)
 109     {
 110       bfd_set_error (bfd_error_bad_value);
 111       return FALSE;
 112     }
 113
 114   return _bfd_sparc_elf_merge_private_bfd_data (ibfd, obfd);
 115 }
 116
 117 /* The final processing done just before writing out the object file.
 118    We need to set the e_machine field appropriately.  */
 119
 120 static void
 121 elf32_sparc_final_write_processing (bfd *abfd,
 122                                     bfd_boolean linker ATTRIBUTE_UNUSED)
 123 {
 124   switch (bfd_get_mach (abfd))
 125     {
 126     case bfd_mach_sparc :
 127     case bfd_mach_sparc_sparclet :
 128     case bfd_mach_sparc_sparclite :
 129       break; /* nothing to do */
 130     case bfd_mach_sparc_v8plus :
 131       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
 132       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
 133       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS;
 134       break;
 135     case bfd_mach_sparc_v8plusa :
 136       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
 137       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
 138       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1;
 139       break;
 140     case bfd_mach_sparc_v8plusb :
 141       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
 142       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
 143       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
 144                                        | EF_SPARC_SUN_US3;
 145       break;
 146     case bfd_mach_sparc_sparclite_le :
 147       elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
 148       break;
 149     default :
 150       abort ();
 151       break;
 152     }
 153 }
 154
 155 static enum elf_reloc_type_class
 156 elf32_sparc_reloc_type_class (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 ATTRIBUTE_UNUSED,
 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 ((abfd->flags & DYNAMIC) == 0
 184       && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 185           || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
 186     elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
 187   return TRUE;
 188 }
 189
 190 #define TARGET_BIG_SYM  bfd_elf32_sparc_vec
 191 #define TARGET_BIG_NAME "elf32-sparc"
 192 #define ELF_ARCH        bfd_arch_sparc
 193 #define ELF_TARGET_ID   SPARC_ELF_DATA
 194 #define ELF_MACHINE_CODE EM_SPARC
 195 #define ELF_MACHINE_ALT1 EM_SPARC32PLUS
 196 #define ELF_MAXPAGESIZE 0x10000
 197 #define ELF_COMMONPAGESIZE 0x2000
 198
 199 #define bfd_elf32_bfd_merge_private_bfd_data \
 200                                         elf32_sparc_merge_private_bfd_data
 201 #define elf_backend_final_write_processing \
 202                                         elf32_sparc_final_write_processing
 203 #define elf_backend_grok_psinfo         elf32_sparc_grok_psinfo
 204 #define elf_backend_reloc_type_class    elf32_sparc_reloc_type_class
 205
 206 #define elf_info_to_howto               _bfd_sparc_elf_info_to_howto
 207 #define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
 208 #define bfd_elf32_bfd_reloc_name_lookup \
 209   _bfd_sparc_elf_reloc_name_lookup
 210 #define bfd_elf32_bfd_link_hash_table_create \
 211                                         _bfd_sparc_elf_link_hash_table_create
 212 #define bfd_elf32_bfd_link_hash_table_free \
 213                                         _bfd_sparc_elf_link_hash_table_free
 214 #define bfd_elf32_bfd_relax_section     _bfd_sparc_elf_relax_section
 215 #define bfd_elf32_new_section_hook      _bfd_sparc_elf_new_section_hook
 216 #define elf_backend_copy_indirect_symbol \
 217                                         _bfd_sparc_elf_copy_indirect_symbol
 218 #define elf_backend_create_dynamic_sections \
 219                                         _bfd_sparc_elf_create_dynamic_sections
 220 #define elf_backend_check_relocs        _bfd_sparc_elf_check_relocs
 221 #define elf_backend_adjust_dynamic_symbol \
 222                                         _bfd_sparc_elf_adjust_dynamic_symbol
 223 #define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym
 224 #define elf_backend_size_dynamic_sections \
 225                                         _bfd_sparc_elf_size_dynamic_sections
 226 #define elf_backend_relocate_section    _bfd_sparc_elf_relocate_section
 227 #define elf_backend_finish_dynamic_symbol \
 228                                         _bfd_sparc_elf_finish_dynamic_symbol
 229 #define elf_backend_finish_dynamic_sections \
 230                                         _bfd_sparc_elf_finish_dynamic_sections
 231 #define bfd_elf32_mkobject              _bfd_sparc_elf_mkobject
 232 #define elf_backend_object_p            _bfd_sparc_elf_object_p
 233 #define elf_backend_gc_mark_hook        _bfd_sparc_elf_gc_mark_hook
 234 #define elf_backend_gc_sweep_hook       _bfd_sparc_elf_gc_sweep_hook
 235 #define elf_backend_plt_sym_val         _bfd_sparc_elf_plt_sym_val
 236 #define elf_backend_init_index_section  _bfd_elf_init_1_index_section
 237
 238 #define elf_backend_can_gc_sections 1
 239 #define elf_backend_can_refcount 1
 240 #define elf_backend_want_got_plt 0
 241 #define elf_backend_plt_readonly 0
 242 #define elf_backend_want_plt_sym 1
 243 #define elf_backend_got_header_size 4
 244 #define elf_backend_rela_normal 1
 245
 246 #define elf_backend_post_process_headers        _bfd_elf_set_osabi
 247 #define elf_backend_add_symbol_hook             elf32_sparc_add_symbol_hook
 248
 249 #include "elf32-target.h"
 250
 251 /* Solaris 2.  */
 252
 253 #undef  TARGET_BIG_SYM
 254 #define TARGET_BIG_SYM                          bfd_elf32_sparc_sol2_vec
 255 #undef  TARGET_BIG_NAME
 256 #define TARGET_BIG_NAME                         "elf32-sparc-sol2"
 257
 258 #undef elf32_bed
 259 #define elf32_bed                               elf32_sparc_sol2_bed
 260
 261 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
 262    boundary.  */
 263 #undef elf_backend_static_tls_alignment
 264 #define elf_backend_static_tls_alignment        8
 265
 266 #include "elf32-target.h"
 267
 268 /* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
 269    the target system as VxWorks.  */
 270
 271 static struct bfd_link_hash_table *
 272 elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
 273 {
 274   struct bfd_link_hash_table *ret;
 275
 276   ret = _bfd_sparc_elf_link_hash_table_create (abfd);
 277   if (ret)
 278     {
 279       struct _bfd_sparc_elf_link_hash_table *htab;
 280
 281       htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
 282       htab->is_vxworks = 1;
 283     }
 284   return ret;
 285 }
 286
 287 /* A final_write_processing hook that does both the SPARC- and VxWorks-
 288    specific handling.  */
 289
 290 static void
 291 elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
 292 {
 293   elf32_sparc_final_write_processing (abfd, linker);
 294   elf_vxworks_final_write_processing (abfd, linker);
 295 }
 296
 297 #undef TARGET_BIG_SYM
 298 #define TARGET_BIG_SYM  bfd_elf32_sparc_vxworks_vec
 299 #undef TARGET_BIG_NAME
 300 #define TARGET_BIG_NAME "elf32-sparc-vxworks"
 301
 302 #undef ELF_MINPAGESIZE
 303 #define ELF_MINPAGESIZE 0x1000
 304
 305 #undef bfd_elf32_bfd_link_hash_table_create
 306 #define bfd_elf32_bfd_link_hash_table_create \
 307   elf32_sparc_vxworks_link_hash_table_create
 308
 309 #undef elf_backend_want_got_plt
 310 #define elf_backend_want_got_plt                1
 311 #undef elf_backend_plt_readonly
 312 #define elf_backend_plt_readonly                1
 313 #undef elf_backend_got_header_size
 314 #define elf_backend_got_header_size             12
 315 #undef elf_backend_add_symbol_hook
 316 #define elf_backend_add_symbol_hook \
 317   elf_vxworks_add_symbol_hook
 318 #undef elf_backend_link_output_symbol_hook
 319 #define elf_backend_link_output_symbol_hook \
 320   elf_vxworks_link_output_symbol_hook
 321 #undef elf_backend_emit_relocs
 322 #define elf_backend_emit_relocs \
 323   elf_vxworks_emit_relocs
 324 #undef elf_backend_final_write_processing
 325 #define elf_backend_final_write_processing \
 326   elf32_sparc_vxworks_final_write_processing
 327 #undef elf_backend_static_tls_alignment
 328
 329 #undef elf32_bed
 330 #define elf32_bed                               sparc_elf_vxworks_bed
 331
 332 #include "elf32-target.h"