elf32-sparc.c revision 1.7
1/* SPARC-specific support for 32-bit ELF 2 Copyright (C) 1993-2017 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 33static bfd_boolean 34elf32_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 69static bfd_boolean 70elf32_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 (_("%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 _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 119static void 120elf32_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 elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS; 146 elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK; 147 elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1 148 | EF_SPARC_SUN_US3; 149 break; 150 case bfd_mach_sparc_sparclite_le : 151 elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA; 152 break; 153 default : 154 abort (); 155 break; 156 } 157} 158 159static enum elf_reloc_type_class 160elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 161 const asection *rel_sec ATTRIBUTE_UNUSED, 162 const Elf_Internal_Rela *rela) 163{ 164 switch ((int) ELF32_R_TYPE (rela->r_info)) 165 { 166 case R_SPARC_RELATIVE: 167 return reloc_class_relative; 168 case R_SPARC_JMP_SLOT: 169 return reloc_class_plt; 170 case R_SPARC_COPY: 171 return reloc_class_copy; 172 default: 173 return reloc_class_normal; 174 } 175} 176 177/* Hook called by the linker routine which adds symbols from an object 178 file. */ 179 180static bfd_boolean 181elf32_sparc_add_symbol_hook (bfd * abfd, 182 struct bfd_link_info * info, 183 Elf_Internal_Sym * sym, 184 const char ** namep ATTRIBUTE_UNUSED, 185 flagword * flagsp ATTRIBUTE_UNUSED, 186 asection ** secp ATTRIBUTE_UNUSED, 187 bfd_vma * valp ATTRIBUTE_UNUSED) 188{ 189 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC 190 && (abfd->flags & DYNAMIC) == 0 191 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour) 192 elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc; 193 return TRUE; 194} 195 196#define TARGET_BIG_SYM sparc_elf32_vec 197#define TARGET_BIG_NAME "elf32-sparc" 198#define ELF_ARCH bfd_arch_sparc 199#define ELF_TARGET_ID SPARC_ELF_DATA 200#define ELF_MACHINE_CODE EM_SPARC 201#define ELF_MACHINE_ALT1 EM_SPARC32PLUS 202#define ELF_MAXPAGESIZE 0x10000 203#define ELF_COMMONPAGESIZE 0x2000 204 205#define bfd_elf32_bfd_merge_private_bfd_data \ 206 elf32_sparc_merge_private_bfd_data 207#define elf_backend_final_write_processing \ 208 elf32_sparc_final_write_processing 209#define elf_backend_grok_psinfo elf32_sparc_grok_psinfo 210#define elf_backend_reloc_type_class elf32_sparc_reloc_type_class 211 212#define elf_info_to_howto _bfd_sparc_elf_info_to_howto 213#define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup 214#define bfd_elf32_bfd_reloc_name_lookup \ 215 _bfd_sparc_elf_reloc_name_lookup 216#define bfd_elf32_bfd_link_hash_table_create \ 217 _bfd_sparc_elf_link_hash_table_create 218#define bfd_elf32_bfd_relax_section _bfd_sparc_elf_relax_section 219#define bfd_elf32_new_section_hook _bfd_sparc_elf_new_section_hook 220#define elf_backend_copy_indirect_symbol \ 221 _bfd_sparc_elf_copy_indirect_symbol 222#define elf_backend_create_dynamic_sections \ 223 _bfd_sparc_elf_create_dynamic_sections 224#define elf_backend_check_relocs _bfd_sparc_elf_check_relocs 225#define elf_backend_adjust_dynamic_symbol \ 226 _bfd_sparc_elf_adjust_dynamic_symbol 227#define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym 228#define elf_backend_size_dynamic_sections \ 229 _bfd_sparc_elf_size_dynamic_sections 230#define elf_backend_relocate_section _bfd_sparc_elf_relocate_section 231#define elf_backend_finish_dynamic_symbol \ 232 _bfd_sparc_elf_finish_dynamic_symbol 233#define elf_backend_finish_dynamic_sections \ 234 _bfd_sparc_elf_finish_dynamic_sections 235#define bfd_elf32_mkobject _bfd_sparc_elf_mkobject 236#define elf_backend_object_p _bfd_sparc_elf_object_p 237#define elf_backend_gc_mark_hook _bfd_sparc_elf_gc_mark_hook 238#define elf_backend_gc_sweep_hook _bfd_sparc_elf_gc_sweep_hook 239#define elf_backend_plt_sym_val _bfd_sparc_elf_plt_sym_val 240#define elf_backend_init_index_section _bfd_elf_init_1_index_section 241#define elf_backend_fixup_symbol _bfd_sparc_elf_fixup_symbol 242 243#define elf_backend_can_gc_sections 1 244#define elf_backend_can_refcount 1 245#define elf_backend_want_got_plt 0 246#define elf_backend_plt_readonly 0 247#define elf_backend_want_plt_sym 1 248#define elf_backend_got_header_size 4 249#define elf_backend_want_dynrelro 1 250#define elf_backend_rela_normal 1 251 252#define elf_backend_add_symbol_hook elf32_sparc_add_symbol_hook 253 254#include "elf32-target.h" 255 256/* Solaris 2. */ 257 258#undef TARGET_BIG_SYM 259#define TARGET_BIG_SYM sparc_elf32_sol2_vec 260#undef TARGET_BIG_NAME 261#define TARGET_BIG_NAME "elf32-sparc-sol2" 262 263#undef elf32_bed 264#define elf32_bed elf32_sparc_sol2_bed 265 266/* The 32-bit static TLS arena size is rounded to the nearest 8-byte 267 boundary. */ 268#undef elf_backend_static_tls_alignment 269#define elf_backend_static_tls_alignment 8 270 271#undef elf_backend_strtab_flags 272#define elf_backend_strtab_flags SHF_STRINGS 273 274static bfd_boolean 275elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 276 bfd *obfd ATTRIBUTE_UNUSED, 277 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 278 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 279{ 280 /* PR 19938: FIXME: Need to add code for setting the sh_info 281 and sh_link fields of Solaris specific section types. */ 282 return FALSE; 283} 284 285#undef elf_backend_copy_special_section_fields 286#define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields 287 288#include "elf32-target.h" 289 290/* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies 291 the target system as VxWorks. */ 292 293static struct bfd_link_hash_table * 294elf32_sparc_vxworks_link_hash_table_create (bfd *abfd) 295{ 296 struct bfd_link_hash_table *ret; 297 298 ret = _bfd_sparc_elf_link_hash_table_create (abfd); 299 if (ret) 300 { 301 struct _bfd_sparc_elf_link_hash_table *htab; 302 303 htab = (struct _bfd_sparc_elf_link_hash_table *) ret; 304 htab->is_vxworks = 1; 305 } 306 return ret; 307} 308 309/* A final_write_processing hook that does both the SPARC- and VxWorks- 310 specific handling. */ 311 312static void 313elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker) 314{ 315 elf32_sparc_final_write_processing (abfd, linker); 316 elf_vxworks_final_write_processing (abfd, linker); 317} 318 319#undef TARGET_BIG_SYM 320#define TARGET_BIG_SYM sparc_elf32_vxworks_vec 321#undef TARGET_BIG_NAME 322#define TARGET_BIG_NAME "elf32-sparc-vxworks" 323 324#undef ELF_MINPAGESIZE 325#define ELF_MINPAGESIZE 0x1000 326 327#undef bfd_elf32_bfd_link_hash_table_create 328#define bfd_elf32_bfd_link_hash_table_create \ 329 elf32_sparc_vxworks_link_hash_table_create 330 331#undef elf_backend_want_got_plt 332#define elf_backend_want_got_plt 1 333#undef elf_backend_plt_readonly 334#define elf_backend_plt_readonly 1 335#undef elf_backend_got_header_size 336#define elf_backend_got_header_size 12 337#undef elf_backend_dtrel_excludes_plt 338#define elf_backend_dtrel_excludes_plt 1 339#undef elf_backend_add_symbol_hook 340#define elf_backend_add_symbol_hook \ 341 elf_vxworks_add_symbol_hook 342#undef elf_backend_link_output_symbol_hook 343#define elf_backend_link_output_symbol_hook \ 344 elf_vxworks_link_output_symbol_hook 345#undef elf_backend_emit_relocs 346#define elf_backend_emit_relocs \ 347 elf_vxworks_emit_relocs 348#undef elf_backend_final_write_processing 349#define elf_backend_final_write_processing \ 350 elf32_sparc_vxworks_final_write_processing 351#undef elf_backend_static_tls_alignment 352#undef elf_backend_strtab_flags 353#undef elf_backend_copy_special_section_fields 354 355#undef elf32_bed 356#define elf32_bed sparc_elf_vxworks_bed 357 358#include "elf32-target.h" 359