1/* IBM S/390-specific support for 32-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 3 Free Software Foundation, Inc. 4 Contributed by Carl B. Pedersen and Martin Schwidefsky. 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 2 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, MA 21 02110-1301, USA. */ 22 23#include "bfd.h" 24#include "sysdep.h" 25#include "bfdlink.h" 26#include "libbfd.h" 27#include "elf-bfd.h" 28 29static reloc_howto_type *elf_s390_reloc_type_lookup 30 PARAMS ((bfd *, bfd_reloc_code_real_type)); 31static void elf_s390_info_to_howto 32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 33static bfd_boolean elf_s390_is_local_label_name 34 PARAMS ((bfd *, const char *)); 35static struct bfd_hash_entry *link_hash_newfunc 36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 37static struct bfd_link_hash_table *elf_s390_link_hash_table_create 38 PARAMS ((bfd *)); 39static bfd_boolean create_got_section 40 PARAMS((bfd *, struct bfd_link_info *)); 41static bfd_boolean elf_s390_create_dynamic_sections 42 PARAMS((bfd *, struct bfd_link_info *)); 43static void elf_s390_copy_indirect_symbol 44 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, 45 struct elf_link_hash_entry *)); 46static bfd_boolean elf_s390_check_relocs 47 PARAMS ((bfd *, struct bfd_link_info *, asection *, 48 const Elf_Internal_Rela *)); 49static asection *elf_s390_gc_mark_hook 50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, 51 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 52static bfd_boolean elf_s390_gc_sweep_hook 53 PARAMS ((bfd *, struct bfd_link_info *, asection *, 54 const Elf_Internal_Rela *)); 55struct elf_s390_link_hash_entry; 56static void elf_s390_adjust_gotplt 57 PARAMS ((struct elf_s390_link_hash_entry *)); 58static bfd_boolean elf_s390_adjust_dynamic_symbol 59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 60static bfd_boolean allocate_dynrelocs 61 PARAMS ((struct elf_link_hash_entry *, PTR)); 62static bfd_boolean readonly_dynrelocs 63 PARAMS ((struct elf_link_hash_entry *, PTR)); 64static bfd_boolean elf_s390_size_dynamic_sections 65 PARAMS ((bfd *, struct bfd_link_info *)); 66static bfd_boolean elf_s390_relocate_section 67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 69static bfd_boolean elf_s390_finish_dynamic_symbol 70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 71 Elf_Internal_Sym *)); 72static enum elf_reloc_type_class elf_s390_reloc_type_class 73 PARAMS ((const Elf_Internal_Rela *)); 74static bfd_boolean elf_s390_finish_dynamic_sections 75 PARAMS ((bfd *, struct bfd_link_info *)); 76static bfd_boolean elf_s390_mkobject 77 PARAMS ((bfd *)); 78static bfd_boolean elf_s390_object_p 79 PARAMS ((bfd *)); 80static bfd_boolean elf_s390_grok_prstatus 81 PARAMS ((bfd *, Elf_Internal_Note *)); 82static int elf_s390_tls_transition 83 PARAMS ((struct bfd_link_info *, int, int)); 84static bfd_reloc_status_type s390_tls_reloc 85 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 86static bfd_vma dtpoff_base 87 PARAMS ((struct bfd_link_info *)); 88static bfd_vma tpoff 89 PARAMS ((struct bfd_link_info *, bfd_vma)); 90static void invalid_tls_insn 91 PARAMS ((bfd *, asection *, Elf_Internal_Rela *)); 92static bfd_reloc_status_type s390_elf_ldisp_reloc 93 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 94 95#include "elf/s390.h" 96 97/* The relocation "howto" table. */ 98 99static reloc_howto_type elf_howto_table[] = 100{ 101 HOWTO (R_390_NONE, /* type */ 102 0, /* rightshift */ 103 0, /* size (0 = byte, 1 = short, 2 = long) */ 104 0, /* bitsize */ 105 FALSE, /* pc_relative */ 106 0, /* bitpos */ 107 complain_overflow_dont, /* complain_on_overflow */ 108 bfd_elf_generic_reloc, /* special_function */ 109 "R_390_NONE", /* name */ 110 FALSE, /* partial_inplace */ 111 0, /* src_mask */ 112 0, /* dst_mask */ 113 FALSE), /* pcrel_offset */ 114 115 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 116 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 117 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 118 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 119 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 120 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 121 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 122 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 123 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 124 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 125 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 126 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 127 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 128 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 129 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 130 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 131 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 132 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE), 133 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 134 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE), 135 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 136 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE), 137 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 138 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE), 139 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 140 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE), 141 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 142 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE), 143 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 144 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 145 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 146 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 147 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 148 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 149 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 150 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 151 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 152 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 153 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 154 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 155 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 156 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE), 157 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */ 158 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */ 159 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */ 160 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */ 161 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 162 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE), 163 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 164 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 165 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */ 166 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 167 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 168 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 169 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 170 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 171 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 172 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */ 173 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 174 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE), 175 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 176 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 177 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 178 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 179 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */ 180 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 181 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 182 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 183 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 184 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 185 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 186 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 187 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE), 188 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */ 189 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 190 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 191 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 192 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE), 193 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */ 194 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 195 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE), 196 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */ 197 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 198 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE), 199 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */ 200 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 201 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE), 202 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 203 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE), 204 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */ 205 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 206 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE), 207 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */ 208 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE), 210 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE), 212 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE), 214 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 215 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 216 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 217 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 218 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 219 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 220 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 221 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 222}; 223 224/* GNU extension to record C++ vtable hierarchy. */ 225static reloc_howto_type elf32_s390_vtinherit_howto = 226 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 227static reloc_howto_type elf32_s390_vtentry_howto = 228 HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE); 229 230static reloc_howto_type * 231elf_s390_reloc_type_lookup (abfd, code) 232 bfd *abfd ATTRIBUTE_UNUSED; 233 bfd_reloc_code_real_type code; 234{ 235 switch (code) 236 { 237 case BFD_RELOC_NONE: 238 return &elf_howto_table[(int) R_390_NONE]; 239 case BFD_RELOC_8: 240 return &elf_howto_table[(int) R_390_8]; 241 case BFD_RELOC_390_12: 242 return &elf_howto_table[(int) R_390_12]; 243 case BFD_RELOC_16: 244 return &elf_howto_table[(int) R_390_16]; 245 case BFD_RELOC_32: 246 return &elf_howto_table[(int) R_390_32]; 247 case BFD_RELOC_CTOR: 248 return &elf_howto_table[(int) R_390_32]; 249 case BFD_RELOC_32_PCREL: 250 return &elf_howto_table[(int) R_390_PC32]; 251 case BFD_RELOC_390_GOT12: 252 return &elf_howto_table[(int) R_390_GOT12]; 253 case BFD_RELOC_32_GOT_PCREL: 254 return &elf_howto_table[(int) R_390_GOT32]; 255 case BFD_RELOC_390_PLT32: 256 return &elf_howto_table[(int) R_390_PLT32]; 257 case BFD_RELOC_390_COPY: 258 return &elf_howto_table[(int) R_390_COPY]; 259 case BFD_RELOC_390_GLOB_DAT: 260 return &elf_howto_table[(int) R_390_GLOB_DAT]; 261 case BFD_RELOC_390_JMP_SLOT: 262 return &elf_howto_table[(int) R_390_JMP_SLOT]; 263 case BFD_RELOC_390_RELATIVE: 264 return &elf_howto_table[(int) R_390_RELATIVE]; 265 case BFD_RELOC_32_GOTOFF: 266 return &elf_howto_table[(int) R_390_GOTOFF32]; 267 case BFD_RELOC_390_GOTPC: 268 return &elf_howto_table[(int) R_390_GOTPC]; 269 case BFD_RELOC_390_GOT16: 270 return &elf_howto_table[(int) R_390_GOT16]; 271 case BFD_RELOC_16_PCREL: 272 return &elf_howto_table[(int) R_390_PC16]; 273 case BFD_RELOC_390_PC16DBL: 274 return &elf_howto_table[(int) R_390_PC16DBL]; 275 case BFD_RELOC_390_PLT16DBL: 276 return &elf_howto_table[(int) R_390_PLT16DBL]; 277 case BFD_RELOC_390_PC32DBL: 278 return &elf_howto_table[(int) R_390_PC32DBL]; 279 case BFD_RELOC_390_PLT32DBL: 280 return &elf_howto_table[(int) R_390_PLT32DBL]; 281 case BFD_RELOC_390_GOTPCDBL: 282 return &elf_howto_table[(int) R_390_GOTPCDBL]; 283 case BFD_RELOC_390_GOTENT: 284 return &elf_howto_table[(int) R_390_GOTENT]; 285 case BFD_RELOC_16_GOTOFF: 286 return &elf_howto_table[(int) R_390_GOTOFF16]; 287 case BFD_RELOC_390_GOTPLT12: 288 return &elf_howto_table[(int) R_390_GOTPLT12]; 289 case BFD_RELOC_390_GOTPLT16: 290 return &elf_howto_table[(int) R_390_GOTPLT16]; 291 case BFD_RELOC_390_GOTPLT32: 292 return &elf_howto_table[(int) R_390_GOTPLT32]; 293 case BFD_RELOC_390_GOTPLTENT: 294 return &elf_howto_table[(int) R_390_GOTPLTENT]; 295 case BFD_RELOC_390_PLTOFF16: 296 return &elf_howto_table[(int) R_390_PLTOFF16]; 297 case BFD_RELOC_390_PLTOFF32: 298 return &elf_howto_table[(int) R_390_PLTOFF32]; 299 case BFD_RELOC_390_TLS_LOAD: 300 return &elf_howto_table[(int) R_390_TLS_LOAD]; 301 case BFD_RELOC_390_TLS_GDCALL: 302 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 303 case BFD_RELOC_390_TLS_LDCALL: 304 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 305 case BFD_RELOC_390_TLS_GD32: 306 return &elf_howto_table[(int) R_390_TLS_GD32]; 307 case BFD_RELOC_390_TLS_GOTIE12: 308 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 309 case BFD_RELOC_390_TLS_GOTIE32: 310 return &elf_howto_table[(int) R_390_TLS_GOTIE32]; 311 case BFD_RELOC_390_TLS_LDM32: 312 return &elf_howto_table[(int) R_390_TLS_LDM32]; 313 case BFD_RELOC_390_TLS_IE32: 314 return &elf_howto_table[(int) R_390_TLS_IE32]; 315 case BFD_RELOC_390_TLS_IEENT: 316 return &elf_howto_table[(int) R_390_TLS_IEENT]; 317 case BFD_RELOC_390_TLS_LE32: 318 return &elf_howto_table[(int) R_390_TLS_LE32]; 319 case BFD_RELOC_390_TLS_LDO32: 320 return &elf_howto_table[(int) R_390_TLS_LDO32]; 321 case BFD_RELOC_390_TLS_DTPMOD: 322 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 323 case BFD_RELOC_390_TLS_DTPOFF: 324 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 325 case BFD_RELOC_390_TLS_TPOFF: 326 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 327 case BFD_RELOC_390_20: 328 return &elf_howto_table[(int) R_390_20]; 329 case BFD_RELOC_390_GOT20: 330 return &elf_howto_table[(int) R_390_GOT20]; 331 case BFD_RELOC_390_GOTPLT20: 332 return &elf_howto_table[(int) R_390_GOTPLT20]; 333 case BFD_RELOC_390_TLS_GOTIE20: 334 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 335 case BFD_RELOC_VTABLE_INHERIT: 336 return &elf32_s390_vtinherit_howto; 337 case BFD_RELOC_VTABLE_ENTRY: 338 return &elf32_s390_vtentry_howto; 339 default: 340 break; 341 } 342 return 0; 343} 344 345/* We need to use ELF32_R_TYPE so we have our own copy of this function, 346 and elf32-s390.c has its own copy. */ 347 348static void 349elf_s390_info_to_howto (abfd, cache_ptr, dst) 350 bfd *abfd ATTRIBUTE_UNUSED; 351 arelent *cache_ptr; 352 Elf_Internal_Rela *dst; 353{ 354 unsigned int r_type = ELF32_R_TYPE(dst->r_info); 355 switch (r_type) 356 { 357 case R_390_GNU_VTINHERIT: 358 cache_ptr->howto = &elf32_s390_vtinherit_howto; 359 break; 360 361 case R_390_GNU_VTENTRY: 362 cache_ptr->howto = &elf32_s390_vtentry_howto; 363 break; 364 365 default: 366 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 367 { 368 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 369 abfd, (int) r_type); 370 r_type = R_390_NONE; 371 } 372 cache_ptr->howto = &elf_howto_table[r_type]; 373 } 374} 375 376/* A relocation function which doesn't do anything. */ 377static bfd_reloc_status_type 378s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section, 379 output_bfd, error_message) 380 bfd *abfd ATTRIBUTE_UNUSED; 381 arelent *reloc_entry; 382 asymbol *symbol ATTRIBUTE_UNUSED; 383 PTR data ATTRIBUTE_UNUSED; 384 asection *input_section; 385 bfd *output_bfd; 386 char **error_message ATTRIBUTE_UNUSED; 387{ 388 if (output_bfd) 389 reloc_entry->address += input_section->output_offset; 390 return bfd_reloc_ok; 391} 392 393/* Handle the large displacement relocs. */ 394static bfd_reloc_status_type 395s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section, 396 output_bfd, error_message) 397 bfd *abfd ATTRIBUTE_UNUSED; 398 arelent *reloc_entry; 399 asymbol *symbol; 400 PTR data ATTRIBUTE_UNUSED; 401 asection *input_section; 402 bfd *output_bfd; 403 char **error_message ATTRIBUTE_UNUSED; 404{ 405 reloc_howto_type *howto = reloc_entry->howto; 406 bfd_vma relocation; 407 bfd_vma insn; 408 409 if (output_bfd != (bfd *) NULL 410 && (symbol->flags & BSF_SECTION_SYM) == 0 411 && (! howto->partial_inplace 412 || reloc_entry->addend == 0)) 413 { 414 reloc_entry->address += input_section->output_offset; 415 return bfd_reloc_ok; 416 } 417 418 if (output_bfd != NULL) 419 return bfd_reloc_continue; 420 421 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 422 return bfd_reloc_outofrange; 423 424 relocation = (symbol->value 425 + symbol->section->output_section->vma 426 + symbol->section->output_offset); 427 relocation += reloc_entry->addend; 428 if (howto->pc_relative) 429 { 430 relocation -= (input_section->output_section->vma 431 + input_section->output_offset); 432 relocation -= reloc_entry->address; 433 } 434 435 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 436 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 437 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 438 439 if ((bfd_signed_vma) relocation < - 0x80000 440 || (bfd_signed_vma) relocation > 0x7ffff) 441 return bfd_reloc_overflow; 442 else 443 return bfd_reloc_ok; 444} 445 446static bfd_boolean 447elf_s390_is_local_label_name (abfd, name) 448 bfd *abfd; 449 const char *name; 450{ 451 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 452 return TRUE; 453 454 return _bfd_elf_is_local_label_name (abfd, name); 455} 456 457/* Functions for the 390 ELF linker. */ 458 459/* The name of the dynamic interpreter. This is put in the .interp 460 section. */ 461 462#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 463 464/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 465 copying dynamic variables from a shared lib into an app's dynbss 466 section, and instead use a dynamic relocation to point into the 467 shared lib. */ 468#define ELIMINATE_COPY_RELOCS 1 469 470/* The size in bytes of the first entry in the procedure linkage table. */ 471#define PLT_FIRST_ENTRY_SIZE 32 472/* The size in bytes of an entry in the procedure linkage table. */ 473#define PLT_ENTRY_SIZE 32 474 475#define GOT_ENTRY_SIZE 4 476 477/* The first three entries in a procedure linkage table are reserved, 478 and the initial contents are unimportant (we zero them out). 479 Subsequent entries look like this. See the SVR4 ABI 386 480 supplement to see how this works. */ 481 482/* For the s390, simple addr offset can only be 0 - 4096. 483 To use the full 2 GB address space, several instructions 484 are needed to load an address in a register and execute 485 a branch( or just saving the address) 486 487 Furthermore, only r 0 and 1 are free to use!!! */ 488 489/* The first 3 words in the GOT are then reserved. 490 Word 0 is the address of the dynamic table. 491 Word 1 is a pointer to a structure describing the object 492 Word 2 is used to point to the loader entry address. 493 494 The code for position independent PLT entries looks like this: 495 496 r12 holds addr of the current GOT at entry to the PLT 497 498 The GOT holds the address in the PLT to be executed. 499 The loader then gets: 500 24(15) = Pointer to the structure describing the object. 501 28(15) = Offset in symbol table 502 503 The loader must then find the module where the function is 504 and insert the address in the GOT. 505 506 Note: 390 can only address +- 64 K relative. 507 We check if offset > 65536, then make a relative branch -64xxx 508 back to a previous defined branch 509 510PLT1: BASR 1,0 # 2 bytes 511 L 1,22(1) # 4 bytes Load offset in GOT in r 1 512 L 1,(1,12) # 4 bytes Load address from GOT in r1 513 BCR 15,1 # 2 bytes Jump to address 514RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 515 L 1,14(1) # 4 bytes Load offset in symol table in r1 516 BRC 15,-x # 4 bytes Jump to start of PLT 517 .word 0 # 2 bytes filler 518 .long ? # 4 bytes offset in GOT 519 .long ? # 4 bytes offset into symbol table 520 521 This was the general case. There are two additional, optimizes PLT 522 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768. 523 First the one for GOT offsets < 4096: 524 525PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1 526 BCR 15,1 # 2 bytes Jump to address 527 .word 0,0,0 # 6 bytes filler 528RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 529 L 1,14(1) # 4 bytes Load offset in symbol table in r1 530 BRC 15,-x # 4 bytes Jump to start of PLT 531 .word 0,0,0 # 6 bytes filler 532 .long ? # 4 bytes offset into symbol table 533 534 Second the one for GOT offsets < 32768: 535 536PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1 537 L 1,(1,12) # 4 bytes Load address from GOT to r1 538 BCR 15,1 # 2 bytes Jump to address 539 .word 0 # 2 bytes filler 540RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 541 L 1,14(1) # 4 bytes Load offset in symbol table in r1 542 BRC 15,-x # 4 bytes Jump to start of PLT 543 .word 0,0,0 # 6 bytes filler 544 .long ? # 4 bytes offset into symbol table 545 546Total = 32 bytes per PLT entry 547 548 The code for static build PLT entries looks like this: 549 550PLT1: BASR 1,0 # 2 bytes 551 L 1,22(1) # 4 bytes Load address of GOT entry 552 L 1,0(0,1) # 4 bytes Load address from GOT in r1 553 BCR 15,1 # 2 bytes Jump to address 554RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 555 L 1,14(1) # 4 bytes Load offset in symbol table in r1 556 BRC 15,-x # 4 bytes Jump to start of PLT 557 .word 0 # 2 bytes filler 558 .long ? # 4 bytes address of GOT entry 559 .long ? # 4 bytes offset into symbol table */ 560 561#define PLT_PIC_ENTRY_WORD0 0x0d105810 562#define PLT_PIC_ENTRY_WORD1 0x10165811 563#define PLT_PIC_ENTRY_WORD2 0xc00007f1 564#define PLT_PIC_ENTRY_WORD3 0x0d105810 565#define PLT_PIC_ENTRY_WORD4 0x100ea7f4 566 567#define PLT_PIC12_ENTRY_WORD0 0x5810c000 568#define PLT_PIC12_ENTRY_WORD1 0x07f10000 569#define PLT_PIC12_ENTRY_WORD2 0x00000000 570#define PLT_PIC12_ENTRY_WORD3 0x0d105810 571#define PLT_PIC12_ENTRY_WORD4 0x100ea7f4 572 573#define PLT_PIC16_ENTRY_WORD0 0xa7180000 574#define PLT_PIC16_ENTRY_WORD1 0x5811c000 575#define PLT_PIC16_ENTRY_WORD2 0x07f10000 576#define PLT_PIC16_ENTRY_WORD3 0x0d105810 577#define PLT_PIC16_ENTRY_WORD4 0x100ea7f4 578 579#define PLT_ENTRY_WORD0 0x0d105810 580#define PLT_ENTRY_WORD1 0x10165810 581#define PLT_ENTRY_WORD2 0x100007f1 582#define PLT_ENTRY_WORD3 0x0d105810 583#define PLT_ENTRY_WORD4 0x100ea7f4 584 585/* The first PLT entry pushes the offset into the symbol table 586 from R1 onto the stack at 8(15) and the loader object info 587 at 12(15), loads the loader address in R1 and jumps to it. */ 588 589/* The first entry in the PLT for PIC code: 590 591PLT0: 592 ST 1,28(15) # R1 has offset into symbol table 593 L 1,4(12) # Get loader ino(object struct address) 594 ST 1,24(15) # Store address 595 L 1,8(12) # Entry address of loader in R1 596 BR 1 # Jump to loader 597 598 The first entry in the PLT for static code: 599 600PLT0: 601 ST 1,28(15) # R1 has offset into symbol table 602 BASR 1,0 603 L 1,18(0,1) # Get address of GOT 604 MVC 24(4,15),4(1) # Move loader ino to stack 605 L 1,8(1) # Get address of loader 606 BR 1 # Jump to loader 607 .word 0 # filler 608 .long got # address of GOT */ 609 610#define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c 611#define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004 612#define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018 613#define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008 614#define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000 615 616#define PLT_FIRST_ENTRY_WORD0 0x5010f01c 617#define PLT_FIRST_ENTRY_WORD1 0x0d105810 618#define PLT_FIRST_ENTRY_WORD2 0x1012D203 619#define PLT_FIRST_ENTRY_WORD3 0xf0181004 620#define PLT_FIRST_ENTRY_WORD4 0x58101008 621#define PLT_FIRST_ENTRY_WORD5 0x07f10000 622 623/* The s390 linker needs to keep track of the number of relocs that it 624 decides to copy as dynamic relocs in check_relocs for each symbol. 625 This is so that it can later discard them if they are found to be 626 unnecessary. We store the information in a field extending the 627 regular ELF linker hash table. */ 628 629struct elf_s390_dyn_relocs 630{ 631 struct elf_s390_dyn_relocs *next; 632 633 /* The input section of the reloc. */ 634 asection *sec; 635 636 /* Total number of relocs copied for the input section. */ 637 bfd_size_type count; 638 639 /* Number of pc-relative relocs copied for the input section. */ 640 bfd_size_type pc_count; 641}; 642 643/* s390 ELF linker hash entry. */ 644 645struct elf_s390_link_hash_entry 646{ 647 struct elf_link_hash_entry elf; 648 649 /* Track dynamic relocs copied for this symbol. */ 650 struct elf_s390_dyn_relocs *dyn_relocs; 651 652 /* Number of GOTPLT references for a function. */ 653 bfd_signed_vma gotplt_refcount; 654 655#define GOT_UNKNOWN 0 656#define GOT_NORMAL 1 657#define GOT_TLS_GD 2 658#define GOT_TLS_IE 3 659#define GOT_TLS_IE_NLT 4 660 unsigned char tls_type; 661}; 662 663#define elf_s390_hash_entry(ent) \ 664 ((struct elf_s390_link_hash_entry *)(ent)) 665 666struct elf_s390_obj_tdata 667{ 668 struct elf_obj_tdata root; 669 670 /* tls_type for each local got entry. */ 671 char *local_got_tls_type; 672}; 673 674#define elf_s390_tdata(abfd) \ 675 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 676 677#define elf_s390_local_got_tls_type(abfd) \ 678 (elf_s390_tdata (abfd)->local_got_tls_type) 679 680static bfd_boolean 681elf_s390_mkobject (abfd) 682 bfd *abfd; 683{ 684 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata); 685 abfd->tdata.any = bfd_zalloc (abfd, amt); 686 if (abfd->tdata.any == NULL) 687 return FALSE; 688 return TRUE; 689} 690 691static bfd_boolean 692elf_s390_object_p (abfd) 693 bfd *abfd; 694{ 695 /* Set the right machine number for an s390 elf32 file. */ 696 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31); 697} 698 699/* s390 ELF linker hash table. */ 700 701struct elf_s390_link_hash_table 702{ 703 struct elf_link_hash_table elf; 704 705 /* Short-cuts to get to dynamic linker sections. */ 706 asection *sgot; 707 asection *sgotplt; 708 asection *srelgot; 709 asection *splt; 710 asection *srelplt; 711 asection *sdynbss; 712 asection *srelbss; 713 714 union { 715 bfd_signed_vma refcount; 716 bfd_vma offset; 717 } tls_ldm_got; 718 719 /* Small local sym to section mapping cache. */ 720 struct sym_sec_cache sym_sec; 721}; 722 723/* Get the s390 ELF linker hash table from a link_info structure. */ 724 725#define elf_s390_hash_table(p) \ 726 ((struct elf_s390_link_hash_table *) ((p)->hash)) 727 728/* Create an entry in an s390 ELF linker hash table. */ 729 730static struct bfd_hash_entry * 731link_hash_newfunc (entry, table, string) 732 struct bfd_hash_entry *entry; 733 struct bfd_hash_table *table; 734 const char *string; 735{ 736 /* Allocate the structure if it has not already been allocated by a 737 subclass. */ 738 if (entry == NULL) 739 { 740 entry = bfd_hash_allocate (table, 741 sizeof (struct elf_s390_link_hash_entry)); 742 if (entry == NULL) 743 return entry; 744 } 745 746 /* Call the allocation method of the superclass. */ 747 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 748 if (entry != NULL) 749 { 750 struct elf_s390_link_hash_entry *eh; 751 752 eh = (struct elf_s390_link_hash_entry *) entry; 753 eh->dyn_relocs = NULL; 754 eh->gotplt_refcount = 0; 755 eh->tls_type = GOT_UNKNOWN; 756 } 757 758 return entry; 759} 760 761/* Create an s390 ELF linker hash table. */ 762 763static struct bfd_link_hash_table * 764elf_s390_link_hash_table_create (abfd) 765 bfd *abfd; 766{ 767 struct elf_s390_link_hash_table *ret; 768 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 769 770 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt); 771 if (ret == NULL) 772 return NULL; 773 774 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 775 sizeof (struct elf_s390_link_hash_entry))) 776 { 777 free (ret); 778 return NULL; 779 } 780 781 ret->sgot = NULL; 782 ret->sgotplt = NULL; 783 ret->srelgot = NULL; 784 ret->splt = NULL; 785 ret->srelplt = NULL; 786 ret->sdynbss = NULL; 787 ret->srelbss = NULL; 788 ret->tls_ldm_got.refcount = 0; 789 ret->sym_sec.abfd = NULL; 790 791 return &ret->elf.root; 792} 793 794/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 795 shortcuts to them in our hash table. */ 796 797static bfd_boolean 798create_got_section (dynobj, info) 799 bfd *dynobj; 800 struct bfd_link_info *info; 801{ 802 struct elf_s390_link_hash_table *htab; 803 804 if (! _bfd_elf_create_got_section (dynobj, info)) 805 return FALSE; 806 807 htab = elf_s390_hash_table (info); 808 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 809 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 810 if (!htab->sgot || !htab->sgotplt) 811 abort (); 812 813 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", 814 (SEC_ALLOC | SEC_LOAD 815 | SEC_HAS_CONTENTS 816 | SEC_IN_MEMORY 817 | SEC_LINKER_CREATED 818 | SEC_READONLY)); 819 if (htab->srelgot == NULL 820 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 821 return FALSE; 822 return TRUE; 823} 824 825/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 826 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 827 hash table. */ 828 829static bfd_boolean 830elf_s390_create_dynamic_sections (dynobj, info) 831 bfd *dynobj; 832 struct bfd_link_info *info; 833{ 834 struct elf_s390_link_hash_table *htab; 835 836 htab = elf_s390_hash_table (info); 837 if (!htab->sgot && !create_got_section (dynobj, info)) 838 return FALSE; 839 840 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 841 return FALSE; 842 843 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 844 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 845 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 846 if (!info->shared) 847 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 848 849 if (!htab->splt || !htab->srelplt || !htab->sdynbss 850 || (!info->shared && !htab->srelbss)) 851 abort (); 852 853 return TRUE; 854} 855 856/* Copy the extra info we tack onto an elf_link_hash_entry. */ 857 858static void 859elf_s390_copy_indirect_symbol (info, dir, ind) 860 struct bfd_link_info *info; 861 struct elf_link_hash_entry *dir, *ind; 862{ 863 struct elf_s390_link_hash_entry *edir, *eind; 864 865 edir = (struct elf_s390_link_hash_entry *) dir; 866 eind = (struct elf_s390_link_hash_entry *) ind; 867 868 if (eind->dyn_relocs != NULL) 869 { 870 if (edir->dyn_relocs != NULL) 871 { 872 struct elf_s390_dyn_relocs **pp; 873 struct elf_s390_dyn_relocs *p; 874 875 /* Add reloc counts against the indirect sym to the direct sym 876 list. Merge any entries against the same section. */ 877 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 878 { 879 struct elf_s390_dyn_relocs *q; 880 881 for (q = edir->dyn_relocs; q != NULL; q = q->next) 882 if (q->sec == p->sec) 883 { 884 q->pc_count += p->pc_count; 885 q->count += p->count; 886 *pp = p->next; 887 break; 888 } 889 if (q == NULL) 890 pp = &p->next; 891 } 892 *pp = edir->dyn_relocs; 893 } 894 895 edir->dyn_relocs = eind->dyn_relocs; 896 eind->dyn_relocs = NULL; 897 } 898 899 if (ind->root.type == bfd_link_hash_indirect 900 && dir->got.refcount <= 0) 901 { 902 edir->tls_type = eind->tls_type; 903 eind->tls_type = GOT_UNKNOWN; 904 } 905 906 if (ELIMINATE_COPY_RELOCS 907 && ind->root.type != bfd_link_hash_indirect 908 && dir->dynamic_adjusted) 909 { 910 /* If called to transfer flags for a weakdef during processing 911 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 912 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 913 dir->ref_dynamic |= ind->ref_dynamic; 914 dir->ref_regular |= ind->ref_regular; 915 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 916 dir->needs_plt |= ind->needs_plt; 917 } 918 else 919 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 920} 921 922static int 923elf_s390_tls_transition (info, r_type, is_local) 924 struct bfd_link_info *info; 925 int r_type; 926 int is_local; 927{ 928 if (info->shared) 929 return r_type; 930 931 switch (r_type) 932 { 933 case R_390_TLS_GD32: 934 case R_390_TLS_IE32: 935 if (is_local) 936 return R_390_TLS_LE32; 937 return R_390_TLS_IE32; 938 case R_390_TLS_GOTIE32: 939 if (is_local) 940 return R_390_TLS_LE32; 941 return R_390_TLS_GOTIE32; 942 case R_390_TLS_LDM32: 943 return R_390_TLS_LE32; 944 } 945 946 return r_type; 947} 948 949/* Look through the relocs for a section during the first phase, and 950 allocate space in the global offset table or procedure linkage 951 table. */ 952 953static bfd_boolean 954elf_s390_check_relocs (abfd, info, sec, relocs) 955 bfd *abfd; 956 struct bfd_link_info *info; 957 asection *sec; 958 const Elf_Internal_Rela *relocs; 959{ 960 struct elf_s390_link_hash_table *htab; 961 Elf_Internal_Shdr *symtab_hdr; 962 struct elf_link_hash_entry **sym_hashes; 963 const Elf_Internal_Rela *rel; 964 const Elf_Internal_Rela *rel_end; 965 asection *sreloc; 966 bfd_signed_vma *local_got_refcounts; 967 int tls_type, old_tls_type; 968 969 if (info->relocatable) 970 return TRUE; 971 972 htab = elf_s390_hash_table (info); 973 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 974 sym_hashes = elf_sym_hashes (abfd); 975 local_got_refcounts = elf_local_got_refcounts (abfd); 976 977 sreloc = NULL; 978 979 rel_end = relocs + sec->reloc_count; 980 for (rel = relocs; rel < rel_end; rel++) 981 { 982 unsigned int r_type; 983 unsigned long r_symndx; 984 struct elf_link_hash_entry *h; 985 986 r_symndx = ELF32_R_SYM (rel->r_info); 987 988 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 989 { 990 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 991 abfd, r_symndx); 992 return FALSE; 993 } 994 995 if (r_symndx < symtab_hdr->sh_info) 996 h = NULL; 997 else 998 { 999 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1000 while (h->root.type == bfd_link_hash_indirect 1001 || h->root.type == bfd_link_hash_warning) 1002 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1003 } 1004 1005 /* Create got section and local_got_refcounts array if they 1006 are needed. */ 1007 r_type = elf_s390_tls_transition (info, 1008 ELF32_R_TYPE (rel->r_info), 1009 h == NULL); 1010 switch (r_type) 1011 { 1012 case R_390_GOT12: 1013 case R_390_GOT16: 1014 case R_390_GOT20: 1015 case R_390_GOT32: 1016 case R_390_GOTENT: 1017 case R_390_GOTPLT12: 1018 case R_390_GOTPLT16: 1019 case R_390_GOTPLT20: 1020 case R_390_GOTPLT32: 1021 case R_390_GOTPLTENT: 1022 case R_390_TLS_GD32: 1023 case R_390_TLS_GOTIE12: 1024 case R_390_TLS_GOTIE20: 1025 case R_390_TLS_GOTIE32: 1026 case R_390_TLS_IEENT: 1027 case R_390_TLS_IE32: 1028 case R_390_TLS_LDM32: 1029 if (h == NULL 1030 && local_got_refcounts == NULL) 1031 { 1032 bfd_size_type size; 1033 1034 size = symtab_hdr->sh_info; 1035 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 1036 local_got_refcounts = ((bfd_signed_vma *) 1037 bfd_zalloc (abfd, size)); 1038 if (local_got_refcounts == NULL) 1039 return FALSE; 1040 elf_local_got_refcounts (abfd) = local_got_refcounts; 1041 elf_s390_local_got_tls_type (abfd) 1042 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 1043 } 1044 /* Fall through. */ 1045 case R_390_GOTOFF16: 1046 case R_390_GOTOFF32: 1047 case R_390_GOTPC: 1048 case R_390_GOTPCDBL: 1049 if (htab->sgot == NULL) 1050 { 1051 if (htab->elf.dynobj == NULL) 1052 htab->elf.dynobj = abfd; 1053 if (!create_got_section (htab->elf.dynobj, info)) 1054 return FALSE; 1055 } 1056 } 1057 1058 switch (r_type) 1059 { 1060 case R_390_GOTOFF16: 1061 case R_390_GOTOFF32: 1062 case R_390_GOTPC: 1063 case R_390_GOTPCDBL: 1064 /* Got is created, nothing to be done. */ 1065 break; 1066 1067 case R_390_PLT16DBL: 1068 case R_390_PLT32DBL: 1069 case R_390_PLT32: 1070 case R_390_PLTOFF16: 1071 case R_390_PLTOFF32: 1072 /* This symbol requires a procedure linkage table entry. We 1073 actually build the entry in adjust_dynamic_symbol, 1074 because this might be a case of linking PIC code which is 1075 never referenced by a dynamic object, in which case we 1076 don't need to generate a procedure linkage table entry 1077 after all. */ 1078 1079 /* If this is a local symbol, we resolve it directly without 1080 creating a procedure linkage table entry. */ 1081 if (h != NULL) 1082 { 1083 h->needs_plt = 1; 1084 h->plt.refcount += 1; 1085 } 1086 break; 1087 1088 case R_390_GOTPLT12: 1089 case R_390_GOTPLT16: 1090 case R_390_GOTPLT20: 1091 case R_390_GOTPLT32: 1092 case R_390_GOTPLTENT: 1093 /* This symbol requires either a procedure linkage table entry 1094 or an entry in the local got. We actually build the entry 1095 in adjust_dynamic_symbol because whether this is really a 1096 global reference can change and with it the fact if we have 1097 to create a plt entry or a local got entry. To be able to 1098 make a once global symbol a local one we have to keep track 1099 of the number of gotplt references that exist for this 1100 symbol. */ 1101 if (h != NULL) 1102 { 1103 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1104 h->needs_plt = 1; 1105 h->plt.refcount += 1; 1106 } 1107 else 1108 local_got_refcounts[r_symndx] += 1; 1109 break; 1110 1111 case R_390_TLS_LDM32: 1112 htab->tls_ldm_got.refcount += 1; 1113 break; 1114 1115 case R_390_TLS_IE32: 1116 case R_390_TLS_GOTIE12: 1117 case R_390_TLS_GOTIE20: 1118 case R_390_TLS_GOTIE32: 1119 case R_390_TLS_IEENT: 1120 if (info->shared) 1121 info->flags |= DF_STATIC_TLS; 1122 /* Fall through. */ 1123 1124 case R_390_GOT12: 1125 case R_390_GOT16: 1126 case R_390_GOT20: 1127 case R_390_GOT32: 1128 case R_390_GOTENT: 1129 case R_390_TLS_GD32: 1130 /* This symbol requires a global offset table entry. */ 1131 switch (r_type) 1132 { 1133 default: 1134 case R_390_GOT12: 1135 case R_390_GOT16: 1136 case R_390_GOT20: 1137 case R_390_GOT32: 1138 case R_390_GOTENT: 1139 tls_type = GOT_NORMAL; 1140 break; 1141 case R_390_TLS_GD32: 1142 tls_type = GOT_TLS_GD; 1143 break; 1144 case R_390_TLS_IE32: 1145 case R_390_TLS_GOTIE32: 1146 tls_type = GOT_TLS_IE; 1147 break; 1148 case R_390_TLS_GOTIE12: 1149 case R_390_TLS_GOTIE20: 1150 case R_390_TLS_IEENT: 1151 tls_type = GOT_TLS_IE_NLT; 1152 break; 1153 } 1154 1155 if (h != NULL) 1156 { 1157 h->got.refcount += 1; 1158 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1159 } 1160 else 1161 { 1162 local_got_refcounts[r_symndx] += 1; 1163 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1164 } 1165 /* If a TLS symbol is accessed using IE at least once, 1166 there is no point to use dynamic model for it. */ 1167 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1168 { 1169 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1170 { 1171 (*_bfd_error_handler) 1172 (_("%B: `%s' accessed both as normal and thread local symbol"), 1173 abfd, h->root.root.string); 1174 return FALSE; 1175 } 1176 if (old_tls_type > tls_type) 1177 tls_type = old_tls_type; 1178 } 1179 1180 if (old_tls_type != tls_type) 1181 { 1182 if (h != NULL) 1183 elf_s390_hash_entry (h)->tls_type = tls_type; 1184 else 1185 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1186 } 1187 1188 if (r_type != R_390_TLS_IE32) 1189 break; 1190 /* Fall through. */ 1191 1192 case R_390_TLS_LE32: 1193 if (!info->shared) 1194 break; 1195 info->flags |= DF_STATIC_TLS; 1196 /* Fall through. */ 1197 1198 case R_390_8: 1199 case R_390_16: 1200 case R_390_32: 1201 case R_390_PC16: 1202 case R_390_PC16DBL: 1203 case R_390_PC32DBL: 1204 case R_390_PC32: 1205 if (h != NULL && !info->shared) 1206 { 1207 /* If this reloc is in a read-only section, we might 1208 need a copy reloc. We can't check reliably at this 1209 stage whether the section is read-only, as input 1210 sections have not yet been mapped to output sections. 1211 Tentatively set the flag for now, and correct in 1212 adjust_dynamic_symbol. */ 1213 h->non_got_ref = 1; 1214 1215 /* We may need a .plt entry if the function this reloc 1216 refers to is in a shared lib. */ 1217 h->plt.refcount += 1; 1218 } 1219 1220 /* If we are creating a shared library, and this is a reloc 1221 against a global symbol, or a non PC relative reloc 1222 against a local symbol, then we need to copy the reloc 1223 into the shared library. However, if we are linking with 1224 -Bsymbolic, we do not need to copy a reloc against a 1225 global symbol which is defined in an object we are 1226 including in the link (i.e., DEF_REGULAR is set). At 1227 this point we have not seen all the input files, so it is 1228 possible that DEF_REGULAR is not set now but will be set 1229 later (it is never cleared). In case of a weak definition, 1230 DEF_REGULAR may be cleared later by a strong definition in 1231 a shared library. We account for that possibility below by 1232 storing information in the relocs_copied field of the hash 1233 table entry. A similar situation occurs when creating 1234 shared libraries and symbol visibility changes render the 1235 symbol local. 1236 1237 If on the other hand, we are creating an executable, we 1238 may need to keep relocations for symbols satisfied by a 1239 dynamic library if we manage to avoid copy relocs for the 1240 symbol. */ 1241 if ((info->shared 1242 && (sec->flags & SEC_ALLOC) != 0 1243 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 1244 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL 1245 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL 1246 && ELF32_R_TYPE (rel->r_info) != R_390_PC32) 1247 || (h != NULL 1248 && (! info->symbolic 1249 || h->root.type == bfd_link_hash_defweak 1250 || !h->def_regular)))) 1251 || (ELIMINATE_COPY_RELOCS 1252 && !info->shared 1253 && (sec->flags & SEC_ALLOC) != 0 1254 && h != NULL 1255 && (h->root.type == bfd_link_hash_defweak 1256 || !h->def_regular))) 1257 { 1258 struct elf_s390_dyn_relocs *p; 1259 struct elf_s390_dyn_relocs **head; 1260 1261 /* We must copy these reloc types into the output file. 1262 Create a reloc section in dynobj and make room for 1263 this reloc. */ 1264 if (sreloc == NULL) 1265 { 1266 const char *name; 1267 bfd *dynobj; 1268 1269 name = (bfd_elf_string_from_elf_section 1270 (abfd, 1271 elf_elfheader (abfd)->e_shstrndx, 1272 elf_section_data (sec)->rel_hdr.sh_name)); 1273 if (name == NULL) 1274 return FALSE; 1275 1276 if (strncmp (name, ".rela", 5) != 0 1277 || strcmp (bfd_get_section_name (abfd, sec), 1278 name + 5) != 0) 1279 { 1280 (*_bfd_error_handler) 1281 (_("%B: bad relocation section name `%s\'"), 1282 abfd, name); 1283 } 1284 1285 if (htab->elf.dynobj == NULL) 1286 htab->elf.dynobj = abfd; 1287 1288 dynobj = htab->elf.dynobj; 1289 sreloc = bfd_get_section_by_name (dynobj, name); 1290 if (sreloc == NULL) 1291 { 1292 flagword flags; 1293 1294 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1295 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1296 if ((sec->flags & SEC_ALLOC) != 0) 1297 flags |= SEC_ALLOC | SEC_LOAD; 1298 sreloc = bfd_make_section_with_flags (dynobj, 1299 name, 1300 flags); 1301 if (sreloc == NULL 1302 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 1303 return FALSE; 1304 } 1305 elf_section_data (sec)->sreloc = sreloc; 1306 } 1307 1308 /* If this is a global symbol, we count the number of 1309 relocations we need for this symbol. */ 1310 if (h != NULL) 1311 { 1312 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1313 } 1314 else 1315 { 1316 /* Track dynamic relocs needed for local syms too. 1317 We really need local syms available to do this 1318 easily. Oh well. */ 1319 asection *s; 1320 void *vpp; 1321 1322 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1323 sec, r_symndx); 1324 if (s == NULL) 1325 return FALSE; 1326 1327 vpp = &elf_section_data (s)->local_dynrel; 1328 head = (struct elf_s390_dyn_relocs **) vpp; 1329 } 1330 1331 p = *head; 1332 if (p == NULL || p->sec != sec) 1333 { 1334 bfd_size_type amt = sizeof *p; 1335 1336 p = ((struct elf_s390_dyn_relocs *) 1337 bfd_alloc (htab->elf.dynobj, amt)); 1338 if (p == NULL) 1339 return FALSE; 1340 p->next = *head; 1341 *head = p; 1342 p->sec = sec; 1343 p->count = 0; 1344 p->pc_count = 0; 1345 } 1346 1347 p->count += 1; 1348 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16 1349 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL 1350 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL 1351 || ELF32_R_TYPE (rel->r_info) == R_390_PC32) 1352 p->pc_count += 1; 1353 } 1354 break; 1355 1356 /* This relocation describes the C++ object vtable hierarchy. 1357 Reconstruct it for later use during GC. */ 1358 case R_390_GNU_VTINHERIT: 1359 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1360 return FALSE; 1361 break; 1362 1363 /* This relocation describes which C++ vtable entries are actually 1364 used. Record for later use during GC. */ 1365 case R_390_GNU_VTENTRY: 1366 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1367 return FALSE; 1368 break; 1369 1370 default: 1371 break; 1372 } 1373 } 1374 1375 return TRUE; 1376} 1377 1378/* Return the section that should be marked against GC for a given 1379 relocation. */ 1380 1381static asection * 1382elf_s390_gc_mark_hook (sec, info, rel, h, sym) 1383 asection *sec; 1384 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1385 Elf_Internal_Rela *rel; 1386 struct elf_link_hash_entry *h; 1387 Elf_Internal_Sym *sym; 1388{ 1389 if (h != NULL) 1390 { 1391 switch (ELF32_R_TYPE (rel->r_info)) 1392 { 1393 case R_390_GNU_VTINHERIT: 1394 case R_390_GNU_VTENTRY: 1395 break; 1396 1397 default: 1398 switch (h->root.type) 1399 { 1400 case bfd_link_hash_defined: 1401 case bfd_link_hash_defweak: 1402 return h->root.u.def.section; 1403 1404 case bfd_link_hash_common: 1405 return h->root.u.c.p->section; 1406 1407 default: 1408 break; 1409 } 1410 } 1411 } 1412 else 1413 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 1414 1415 return NULL; 1416} 1417 1418/* Update the got entry reference counts for the section being removed. */ 1419 1420static bfd_boolean 1421elf_s390_gc_sweep_hook (abfd, info, sec, relocs) 1422 bfd *abfd; 1423 struct bfd_link_info *info; 1424 asection *sec; 1425 const Elf_Internal_Rela *relocs; 1426{ 1427 Elf_Internal_Shdr *symtab_hdr; 1428 struct elf_link_hash_entry **sym_hashes; 1429 bfd_signed_vma *local_got_refcounts; 1430 const Elf_Internal_Rela *rel, *relend; 1431 1432 elf_section_data (sec)->local_dynrel = NULL; 1433 1434 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1435 sym_hashes = elf_sym_hashes (abfd); 1436 local_got_refcounts = elf_local_got_refcounts (abfd); 1437 1438 relend = relocs + sec->reloc_count; 1439 for (rel = relocs; rel < relend; rel++) 1440 { 1441 unsigned long r_symndx; 1442 unsigned int r_type; 1443 struct elf_link_hash_entry *h = NULL; 1444 1445 r_symndx = ELF32_R_SYM (rel->r_info); 1446 if (r_symndx >= symtab_hdr->sh_info) 1447 { 1448 struct elf_s390_link_hash_entry *eh; 1449 struct elf_s390_dyn_relocs **pp; 1450 struct elf_s390_dyn_relocs *p; 1451 1452 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1453 while (h->root.type == bfd_link_hash_indirect 1454 || h->root.type == bfd_link_hash_warning) 1455 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1456 eh = (struct elf_s390_link_hash_entry *) h; 1457 1458 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1459 if (p->sec == sec) 1460 { 1461 /* Everything must go for SEC. */ 1462 *pp = p->next; 1463 break; 1464 } 1465 } 1466 1467 r_type = ELF32_R_TYPE (rel->r_info); 1468 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1469 switch (r_type) 1470 { 1471 case R_390_TLS_LDM32: 1472 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1473 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1474 break; 1475 1476 case R_390_TLS_GD32: 1477 case R_390_TLS_IE32: 1478 case R_390_TLS_GOTIE12: 1479 case R_390_TLS_GOTIE20: 1480 case R_390_TLS_GOTIE32: 1481 case R_390_TLS_IEENT: 1482 case R_390_GOT12: 1483 case R_390_GOT16: 1484 case R_390_GOT20: 1485 case R_390_GOT32: 1486 case R_390_GOTOFF16: 1487 case R_390_GOTOFF32: 1488 case R_390_GOTPC: 1489 case R_390_GOTPCDBL: 1490 case R_390_GOTENT: 1491 if (h != NULL) 1492 { 1493 if (h->got.refcount > 0) 1494 h->got.refcount -= 1; 1495 } 1496 else if (local_got_refcounts != NULL) 1497 { 1498 if (local_got_refcounts[r_symndx] > 0) 1499 local_got_refcounts[r_symndx] -= 1; 1500 } 1501 break; 1502 1503 case R_390_8: 1504 case R_390_12: 1505 case R_390_16: 1506 case R_390_20: 1507 case R_390_32: 1508 case R_390_PC16: 1509 case R_390_PC16DBL: 1510 case R_390_PC32DBL: 1511 case R_390_PC32: 1512 if (info->shared) 1513 break; 1514 /* Fall through. */ 1515 1516 case R_390_PLT16DBL: 1517 case R_390_PLT32DBL: 1518 case R_390_PLT32: 1519 case R_390_PLTOFF16: 1520 case R_390_PLTOFF32: 1521 if (h != NULL) 1522 { 1523 if (h->plt.refcount > 0) 1524 h->plt.refcount -= 1; 1525 } 1526 break; 1527 1528 case R_390_GOTPLT12: 1529 case R_390_GOTPLT16: 1530 case R_390_GOTPLT20: 1531 case R_390_GOTPLT32: 1532 case R_390_GOTPLTENT: 1533 if (h != NULL) 1534 { 1535 if (h->plt.refcount > 0) 1536 { 1537 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1538 h->plt.refcount -= 1; 1539 } 1540 } 1541 else if (local_got_refcounts != NULL) 1542 { 1543 if (local_got_refcounts[r_symndx] > 0) 1544 local_got_refcounts[r_symndx] -= 1; 1545 } 1546 break; 1547 1548 default: 1549 break; 1550 } 1551 } 1552 1553 return TRUE; 1554} 1555 1556/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1557 entry but we found we will not create any. Called when we find we will 1558 not have any PLT for this symbol, by for example 1559 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1560 or elf_s390_size_dynamic_sections if no dynamic sections will be 1561 created (we're only linking static objects). */ 1562 1563static void 1564elf_s390_adjust_gotplt (h) 1565 struct elf_s390_link_hash_entry *h; 1566{ 1567 if (h->elf.root.type == bfd_link_hash_warning) 1568 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1569 1570 if (h->gotplt_refcount <= 0) 1571 return; 1572 1573 /* We simply add the number of gotplt references to the number 1574 * of got references for this symbol. */ 1575 h->elf.got.refcount += h->gotplt_refcount; 1576 h->gotplt_refcount = -1; 1577} 1578 1579/* Adjust a symbol defined by a dynamic object and referenced by a 1580 regular object. The current definition is in some section of the 1581 dynamic object, but we're not including those sections. We have to 1582 change the definition to something the rest of the link can 1583 understand. */ 1584 1585static bfd_boolean 1586elf_s390_adjust_dynamic_symbol (info, h) 1587 struct bfd_link_info *info; 1588 struct elf_link_hash_entry *h; 1589{ 1590 struct elf_s390_link_hash_table *htab; 1591 asection *s; 1592 unsigned int power_of_two; 1593 1594 /* If this is a function, put it in the procedure linkage table. We 1595 will fill in the contents of the procedure linkage table later 1596 (although we could actually do it here). */ 1597 if (h->type == STT_FUNC 1598 || h->needs_plt) 1599 { 1600 if (h->plt.refcount <= 0 1601 || (! info->shared 1602 && !h->def_dynamic 1603 && !h->ref_dynamic 1604 && h->root.type != bfd_link_hash_undefweak 1605 && h->root.type != bfd_link_hash_undefined)) 1606 { 1607 /* This case can occur if we saw a PLT32 reloc in an input 1608 file, but the symbol was never referred to by a dynamic 1609 object, or if all references were garbage collected. In 1610 such a case, we don't actually need to build a procedure 1611 linkage table, and we can just do a PC32 reloc instead. */ 1612 h->plt.offset = (bfd_vma) -1; 1613 h->needs_plt = 0; 1614 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1615 } 1616 1617 return TRUE; 1618 } 1619 else 1620 /* It's possible that we incorrectly decided a .plt reloc was 1621 needed for an R_390_PC32 reloc to a non-function sym in 1622 check_relocs. We can't decide accurately between function and 1623 non-function syms in check-relocs; Objects loaded later in 1624 the link may change h->type. So fix it now. */ 1625 h->plt.offset = (bfd_vma) -1; 1626 1627 /* If this is a weak symbol, and there is a real definition, the 1628 processor independent code will have arranged for us to see the 1629 real definition first, and we can just use the same value. */ 1630 if (h->u.weakdef != NULL) 1631 { 1632 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1633 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1634 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1635 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1636 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1637 h->non_got_ref = h->u.weakdef->non_got_ref; 1638 return TRUE; 1639 } 1640 1641 /* This is a reference to a symbol defined by a dynamic object which 1642 is not a function. */ 1643 1644 /* If we are creating a shared library, we must presume that the 1645 only references to the symbol are via the global offset table. 1646 For such cases we need not do anything here; the relocations will 1647 be handled correctly by relocate_section. */ 1648 if (info->shared) 1649 return TRUE; 1650 1651 /* If there are no references to this symbol that do not use the 1652 GOT, we don't need to generate a copy reloc. */ 1653 if (!h->non_got_ref) 1654 return TRUE; 1655 1656 /* If -z nocopyreloc was given, we won't generate them either. */ 1657 if (info->nocopyreloc) 1658 { 1659 h->non_got_ref = 0; 1660 return TRUE; 1661 } 1662 1663 if (ELIMINATE_COPY_RELOCS) 1664 { 1665 struct elf_s390_link_hash_entry * eh; 1666 struct elf_s390_dyn_relocs *p; 1667 1668 eh = (struct elf_s390_link_hash_entry *) h; 1669 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1670 { 1671 s = p->sec->output_section; 1672 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1673 break; 1674 } 1675 1676 /* If we didn't find any dynamic relocs in read-only sections, then 1677 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1678 if (p == NULL) 1679 { 1680 h->non_got_ref = 0; 1681 return TRUE; 1682 } 1683 } 1684 1685 if (h->size == 0) 1686 { 1687 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1688 h->root.root.string); 1689 return TRUE; 1690 } 1691 1692 /* We must allocate the symbol in our .dynbss section, which will 1693 become part of the .bss section of the executable. There will be 1694 an entry for this symbol in the .dynsym section. The dynamic 1695 object will contain position independent code, so all references 1696 from the dynamic object to this symbol will go through the global 1697 offset table. The dynamic linker will use the .dynsym entry to 1698 determine the address it must put in the global offset table, so 1699 both the dynamic object and the regular object will refer to the 1700 same memory location for the variable. */ 1701 1702 htab = elf_s390_hash_table (info); 1703 1704 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1705 copy the initial value out of the dynamic object and into the 1706 runtime process image. */ 1707 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1708 { 1709 htab->srelbss->size += sizeof (Elf32_External_Rela); 1710 h->needs_copy = 1; 1711 } 1712 1713 /* We need to figure out the alignment required for this symbol. I 1714 have no idea how ELF linkers handle this. */ 1715 power_of_two = bfd_log2 (h->size); 1716 if (power_of_two > 3) 1717 power_of_two = 3; 1718 1719 /* Apply the required alignment. */ 1720 s = htab->sdynbss; 1721 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 1722 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1723 { 1724 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1725 return FALSE; 1726 } 1727 1728 /* Define the symbol as being at this point in the section. */ 1729 h->root.u.def.section = s; 1730 h->root.u.def.value = s->size; 1731 1732 /* Increment the section size to make room for the symbol. */ 1733 s->size += h->size; 1734 1735 return TRUE; 1736} 1737 1738/* Allocate space in .plt, .got and associated reloc sections for 1739 dynamic relocs. */ 1740 1741static bfd_boolean 1742allocate_dynrelocs (h, inf) 1743 struct elf_link_hash_entry *h; 1744 PTR inf; 1745{ 1746 struct bfd_link_info *info; 1747 struct elf_s390_link_hash_table *htab; 1748 struct elf_s390_link_hash_entry *eh; 1749 struct elf_s390_dyn_relocs *p; 1750 1751 if (h->root.type == bfd_link_hash_indirect) 1752 return TRUE; 1753 1754 if (h->root.type == bfd_link_hash_warning) 1755 /* When warning symbols are created, they **replace** the "real" 1756 entry in the hash table, thus we never get to see the real 1757 symbol in a hash traversal. So look at it now. */ 1758 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1759 1760 info = (struct bfd_link_info *) inf; 1761 htab = elf_s390_hash_table (info); 1762 1763 if (htab->elf.dynamic_sections_created 1764 && h->plt.refcount > 0 1765 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1766 || h->root.type != bfd_link_hash_undefweak)) 1767 { 1768 /* Make sure this symbol is output as a dynamic symbol. 1769 Undefined weak syms won't yet be marked as dynamic. */ 1770 if (h->dynindx == -1 1771 && !h->forced_local) 1772 { 1773 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1774 return FALSE; 1775 } 1776 1777 if (info->shared 1778 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1779 { 1780 asection *s = htab->splt; 1781 1782 /* If this is the first .plt entry, make room for the special 1783 first entry. */ 1784 if (s->size == 0) 1785 s->size += PLT_FIRST_ENTRY_SIZE; 1786 1787 h->plt.offset = s->size; 1788 1789 /* If this symbol is not defined in a regular file, and we are 1790 not generating a shared library, then set the symbol to this 1791 location in the .plt. This is required to make function 1792 pointers compare as equal between the normal executable and 1793 the shared library. */ 1794 if (! info->shared 1795 && !h->def_regular) 1796 { 1797 h->root.u.def.section = s; 1798 h->root.u.def.value = h->plt.offset; 1799 } 1800 1801 /* Make room for this entry. */ 1802 s->size += PLT_ENTRY_SIZE; 1803 1804 /* We also need to make an entry in the .got.plt section, which 1805 will be placed in the .got section by the linker script. */ 1806 htab->sgotplt->size += GOT_ENTRY_SIZE; 1807 1808 /* We also need to make an entry in the .rela.plt section. */ 1809 htab->srelplt->size += sizeof (Elf32_External_Rela); 1810 } 1811 else 1812 { 1813 h->plt.offset = (bfd_vma) -1; 1814 h->needs_plt = 0; 1815 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1816 } 1817 } 1818 else 1819 { 1820 h->plt.offset = (bfd_vma) -1; 1821 h->needs_plt = 0; 1822 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1823 } 1824 1825 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to 1826 the binary, we can optimize a bit. IE32 and GOTIE32 get converted 1827 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT 1828 we can save the dynamic TLS relocation. */ 1829 if (h->got.refcount > 0 1830 && !info->shared 1831 && h->dynindx == -1 1832 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1833 { 1834 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1835 /* For the GOTIE access without a literal pool entry the offset has 1836 to be stored somewhere. The immediate value in the instruction 1837 is not bit enough so the value is stored in the got. */ 1838 { 1839 h->got.offset = htab->sgot->size; 1840 htab->sgot->size += GOT_ENTRY_SIZE; 1841 } 1842 else 1843 h->got.offset = (bfd_vma) -1; 1844 } 1845 else if (h->got.refcount > 0) 1846 { 1847 asection *s; 1848 bfd_boolean dyn; 1849 int tls_type = elf_s390_hash_entry(h)->tls_type; 1850 1851 /* Make sure this symbol is output as a dynamic symbol. 1852 Undefined weak syms won't yet be marked as dynamic. */ 1853 if (h->dynindx == -1 1854 && !h->forced_local) 1855 { 1856 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1857 return FALSE; 1858 } 1859 1860 s = htab->sgot; 1861 h->got.offset = s->size; 1862 s->size += GOT_ENTRY_SIZE; 1863 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */ 1864 if (tls_type == GOT_TLS_GD) 1865 s->size += GOT_ENTRY_SIZE; 1866 dyn = htab->elf.dynamic_sections_created; 1867 /* R_390_TLS_IE32 needs one dynamic relocation, 1868 R_390_TLS_GD32 needs one if local symbol and two if global. */ 1869 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1870 || tls_type >= GOT_TLS_IE) 1871 htab->srelgot->size += sizeof (Elf32_External_Rela); 1872 else if (tls_type == GOT_TLS_GD) 1873 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela); 1874 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1875 || h->root.type != bfd_link_hash_undefweak) 1876 && (info->shared 1877 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1878 htab->srelgot->size += sizeof (Elf32_External_Rela); 1879 } 1880 else 1881 h->got.offset = (bfd_vma) -1; 1882 1883 eh = (struct elf_s390_link_hash_entry *) h; 1884 if (eh->dyn_relocs == NULL) 1885 return TRUE; 1886 1887 /* In the shared -Bsymbolic case, discard space allocated for 1888 dynamic pc-relative relocs against symbols which turn out to be 1889 defined in regular objects. For the normal shared case, discard 1890 space for pc-relative relocs that have become local due to symbol 1891 visibility changes. */ 1892 1893 if (info->shared) 1894 { 1895 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1896 { 1897 struct elf_s390_dyn_relocs **pp; 1898 1899 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1900 { 1901 p->count -= p->pc_count; 1902 p->pc_count = 0; 1903 if (p->count == 0) 1904 *pp = p->next; 1905 else 1906 pp = &p->next; 1907 } 1908 } 1909 1910 /* Also discard relocs on undefined weak syms with non-default 1911 visibility. */ 1912 if (eh->dyn_relocs != NULL 1913 && h->root.type == bfd_link_hash_undefweak) 1914 { 1915 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1916 eh->dyn_relocs = NULL; 1917 1918 /* Make sure undefined weak symbols are output as a dynamic 1919 symbol in PIEs. */ 1920 else if (h->dynindx == -1 1921 && !h->forced_local) 1922 { 1923 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1924 return FALSE; 1925 } 1926 } 1927 } 1928 else if (ELIMINATE_COPY_RELOCS) 1929 { 1930 /* For the non-shared case, discard space for relocs against 1931 symbols which turn out to need copy relocs or are not 1932 dynamic. */ 1933 1934 if (!h->non_got_ref 1935 && ((h->def_dynamic 1936 && !h->def_regular) 1937 || (htab->elf.dynamic_sections_created 1938 && (h->root.type == bfd_link_hash_undefweak 1939 || h->root.type == bfd_link_hash_undefined)))) 1940 { 1941 /* Make sure this symbol is output as a dynamic symbol. 1942 Undefined weak syms won't yet be marked as dynamic. */ 1943 if (h->dynindx == -1 1944 && !h->forced_local) 1945 { 1946 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1947 return FALSE; 1948 } 1949 1950 /* If that succeeded, we know we'll be keeping all the 1951 relocs. */ 1952 if (h->dynindx != -1) 1953 goto keep; 1954 } 1955 1956 eh->dyn_relocs = NULL; 1957 1958 keep: ; 1959 } 1960 1961 /* Finally, allocate space. */ 1962 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1963 { 1964 asection *sreloc = elf_section_data (p->sec)->sreloc; 1965 1966 sreloc->size += p->count * sizeof (Elf32_External_Rela); 1967 } 1968 1969 return TRUE; 1970} 1971 1972/* Find any dynamic relocs that apply to read-only sections. */ 1973 1974static bfd_boolean 1975readonly_dynrelocs (h, inf) 1976 struct elf_link_hash_entry *h; 1977 PTR inf; 1978{ 1979 struct elf_s390_link_hash_entry *eh; 1980 struct elf_s390_dyn_relocs *p; 1981 1982 if (h->root.type == bfd_link_hash_warning) 1983 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1984 1985 eh = (struct elf_s390_link_hash_entry *) h; 1986 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1987 { 1988 asection *s = p->sec->output_section; 1989 1990 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1991 { 1992 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1993 1994 info->flags |= DF_TEXTREL; 1995 1996 /* Not an error, just cut short the traversal. */ 1997 return FALSE; 1998 } 1999 } 2000 return TRUE; 2001} 2002 2003/* Set the sizes of the dynamic sections. */ 2004 2005static bfd_boolean 2006elf_s390_size_dynamic_sections (output_bfd, info) 2007 bfd *output_bfd ATTRIBUTE_UNUSED; 2008 struct bfd_link_info *info; 2009{ 2010 struct elf_s390_link_hash_table *htab; 2011 bfd *dynobj; 2012 asection *s; 2013 bfd_boolean relocs; 2014 bfd *ibfd; 2015 2016 htab = elf_s390_hash_table (info); 2017 dynobj = htab->elf.dynobj; 2018 if (dynobj == NULL) 2019 abort (); 2020 2021 if (htab->elf.dynamic_sections_created) 2022 { 2023 /* Set the contents of the .interp section to the interpreter. */ 2024 if (info->executable) 2025 { 2026 s = bfd_get_section_by_name (dynobj, ".interp"); 2027 if (s == NULL) 2028 abort (); 2029 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2030 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2031 } 2032 } 2033 2034 /* Set up .got offsets for local syms, and space for local dynamic 2035 relocs. */ 2036 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2037 { 2038 bfd_signed_vma *local_got; 2039 bfd_signed_vma *end_local_got; 2040 char *local_tls_type; 2041 bfd_size_type locsymcount; 2042 Elf_Internal_Shdr *symtab_hdr; 2043 asection *srela; 2044 2045 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 2046 continue; 2047 2048 for (s = ibfd->sections; s != NULL; s = s->next) 2049 { 2050 struct elf_s390_dyn_relocs *p; 2051 2052 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 2053 { 2054 if (!bfd_is_abs_section (p->sec) 2055 && bfd_is_abs_section (p->sec->output_section)) 2056 { 2057 /* Input section has been discarded, either because 2058 it is a copy of a linkonce section or due to 2059 linker script /DISCARD/, so we'll be discarding 2060 the relocs too. */ 2061 } 2062 else if (p->count != 0) 2063 { 2064 srela = elf_section_data (p->sec)->sreloc; 2065 srela->size += p->count * sizeof (Elf32_External_Rela); 2066 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2067 info->flags |= DF_TEXTREL; 2068 } 2069 } 2070 } 2071 2072 local_got = elf_local_got_refcounts (ibfd); 2073 if (!local_got) 2074 continue; 2075 2076 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2077 locsymcount = symtab_hdr->sh_info; 2078 end_local_got = local_got + locsymcount; 2079 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2080 s = htab->sgot; 2081 srela = htab->srelgot; 2082 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2083 { 2084 if (*local_got > 0) 2085 { 2086 *local_got = s->size; 2087 s->size += GOT_ENTRY_SIZE; 2088 if (*local_tls_type == GOT_TLS_GD) 2089 s->size += GOT_ENTRY_SIZE; 2090 if (info->shared) 2091 srela->size += sizeof (Elf32_External_Rela); 2092 } 2093 else 2094 *local_got = (bfd_vma) -1; 2095 } 2096 } 2097 2098 if (htab->tls_ldm_got.refcount > 0) 2099 { 2100 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32 2101 relocs. */ 2102 htab->tls_ldm_got.offset = htab->sgot->size; 2103 htab->sgot->size += 2 * GOT_ENTRY_SIZE; 2104 htab->srelgot->size += sizeof (Elf32_External_Rela); 2105 } 2106 else 2107 htab->tls_ldm_got.offset = -1; 2108 2109 /* Allocate global sym .plt and .got entries, and space for global 2110 sym dynamic relocs. */ 2111 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 2112 2113 /* We now have determined the sizes of the various dynamic sections. 2114 Allocate memory for them. */ 2115 relocs = FALSE; 2116 for (s = dynobj->sections; s != NULL; s = s->next) 2117 { 2118 if ((s->flags & SEC_LINKER_CREATED) == 0) 2119 continue; 2120 2121 if (s == htab->splt 2122 || s == htab->sgot 2123 || s == htab->sgotplt 2124 || s == htab->sdynbss) 2125 { 2126 /* Strip this section if we don't need it; see the 2127 comment below. */ 2128 } 2129 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) 2130 { 2131 if (s->size != 0) 2132 relocs = TRUE; 2133 2134 /* We use the reloc_count field as a counter if we need 2135 to copy relocs into the output file. */ 2136 s->reloc_count = 0; 2137 } 2138 else 2139 { 2140 /* It's not one of our sections, so don't allocate space. */ 2141 continue; 2142 } 2143 2144 if (s->size == 0) 2145 { 2146 /* If we don't need this section, strip it from the 2147 output file. This is to handle .rela.bss and 2148 .rela.plt. We must create it in 2149 create_dynamic_sections, because it must be created 2150 before the linker maps input sections to output 2151 sections. The linker does that before 2152 adjust_dynamic_symbol is called, and it is that 2153 function which decides whether anything needs to go 2154 into these sections. */ 2155 2156 s->flags |= SEC_EXCLUDE; 2157 continue; 2158 } 2159 2160 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2161 continue; 2162 2163 /* Allocate memory for the section contents. We use bfd_zalloc 2164 here in case unused entries are not reclaimed before the 2165 section's contents are written out. This should not happen, 2166 but this way if it does, we get a R_390_NONE reloc instead 2167 of garbage. */ 2168 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2169 if (s->contents == NULL) 2170 return FALSE; 2171 } 2172 2173 if (htab->elf.dynamic_sections_created) 2174 { 2175 /* Add some entries to the .dynamic section. We fill in the 2176 values later, in elf_s390_finish_dynamic_sections, but we 2177 must add the entries now so that we get the correct size for 2178 the .dynamic section. The DT_DEBUG entry is filled in by the 2179 dynamic linker and used by the debugger. */ 2180#define add_dynamic_entry(TAG, VAL) \ 2181 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2182 2183 if (info->executable) 2184 { 2185 if (!add_dynamic_entry (DT_DEBUG, 0)) 2186 return FALSE; 2187 } 2188 2189 if (htab->splt->size != 0) 2190 { 2191 if (!add_dynamic_entry (DT_PLTGOT, 0) 2192 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2193 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2194 || !add_dynamic_entry (DT_JMPREL, 0)) 2195 return FALSE; 2196 } 2197 2198 if (relocs) 2199 { 2200 if (!add_dynamic_entry (DT_RELA, 0) 2201 || !add_dynamic_entry (DT_RELASZ, 0) 2202 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 2203 return FALSE; 2204 2205 /* If any dynamic relocs apply to a read-only section, 2206 then we need a DT_TEXTREL entry. */ 2207 if ((info->flags & DF_TEXTREL) == 0) 2208 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2209 (PTR) info); 2210 2211 if ((info->flags & DF_TEXTREL) != 0) 2212 { 2213 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2214 return FALSE; 2215 } 2216 } 2217 } 2218#undef add_dynamic_entry 2219 2220 return TRUE; 2221} 2222 2223/* Return the base VMA address which should be subtracted from real addresses 2224 when resolving @dtpoff relocation. 2225 This is PT_TLS segment p_vaddr. */ 2226 2227static bfd_vma 2228dtpoff_base (info) 2229 struct bfd_link_info *info; 2230{ 2231 /* If tls_sec is NULL, we should have signalled an error already. */ 2232 if (elf_hash_table (info)->tls_sec == NULL) 2233 return 0; 2234 return elf_hash_table (info)->tls_sec->vma; 2235} 2236 2237/* Return the relocation value for @tpoff relocation 2238 if STT_TLS virtual address is ADDRESS. */ 2239 2240static bfd_vma 2241tpoff (info, address) 2242 struct bfd_link_info *info; 2243 bfd_vma address; 2244{ 2245 struct elf_link_hash_table *htab = elf_hash_table (info); 2246 2247 /* If tls_sec is NULL, we should have signalled an error already. */ 2248 if (htab->tls_sec == NULL) 2249 return 0; 2250 return htab->tls_size + htab->tls_sec->vma - address; 2251} 2252 2253/* Complain if TLS instruction relocation is against an invalid 2254 instruction. */ 2255 2256static void 2257invalid_tls_insn (input_bfd, input_section, rel) 2258 bfd *input_bfd; 2259 asection *input_section; 2260 Elf_Internal_Rela *rel; 2261{ 2262 reloc_howto_type *howto; 2263 2264 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info); 2265 (*_bfd_error_handler) 2266 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"), 2267 input_bfd, 2268 input_section, 2269 (long) rel->r_offset, 2270 howto->name); 2271} 2272 2273/* Relocate a 390 ELF section. */ 2274 2275static bfd_boolean 2276elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, 2277 contents, relocs, local_syms, local_sections) 2278 bfd *output_bfd; 2279 struct bfd_link_info *info; 2280 bfd *input_bfd; 2281 asection *input_section; 2282 bfd_byte *contents; 2283 Elf_Internal_Rela *relocs; 2284 Elf_Internal_Sym *local_syms; 2285 asection **local_sections; 2286{ 2287 struct elf_s390_link_hash_table *htab; 2288 Elf_Internal_Shdr *symtab_hdr; 2289 struct elf_link_hash_entry **sym_hashes; 2290 bfd_vma *local_got_offsets; 2291 Elf_Internal_Rela *rel; 2292 Elf_Internal_Rela *relend; 2293 2294 if (info->relocatable) 2295 return TRUE; 2296 2297 htab = elf_s390_hash_table (info); 2298 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2299 sym_hashes = elf_sym_hashes (input_bfd); 2300 local_got_offsets = elf_local_got_offsets (input_bfd); 2301 2302 rel = relocs; 2303 relend = relocs + input_section->reloc_count; 2304 for (; rel < relend; rel++) 2305 { 2306 unsigned int r_type; 2307 reloc_howto_type *howto; 2308 unsigned long r_symndx; 2309 struct elf_link_hash_entry *h; 2310 Elf_Internal_Sym *sym; 2311 asection *sec; 2312 bfd_vma off; 2313 bfd_vma relocation; 2314 bfd_boolean unresolved_reloc; 2315 bfd_reloc_status_type r; 2316 int tls_type; 2317 2318 r_type = ELF32_R_TYPE (rel->r_info); 2319 if (r_type == (int) R_390_GNU_VTINHERIT 2320 || r_type == (int) R_390_GNU_VTENTRY) 2321 continue; 2322 if (r_type >= (int) R_390_max) 2323 { 2324 bfd_set_error (bfd_error_bad_value); 2325 return FALSE; 2326 } 2327 2328 howto = elf_howto_table + r_type; 2329 r_symndx = ELF32_R_SYM (rel->r_info); 2330 2331 /* This is a final link. */ 2332 h = NULL; 2333 sym = NULL; 2334 sec = NULL; 2335 unresolved_reloc = FALSE; 2336 if (r_symndx < symtab_hdr->sh_info) 2337 { 2338 sym = local_syms + r_symndx; 2339 sec = local_sections[r_symndx]; 2340 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2341 } 2342 else 2343 { 2344 bfd_boolean warned ATTRIBUTE_UNUSED; 2345 2346 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2347 r_symndx, symtab_hdr, sym_hashes, 2348 h, sec, relocation, 2349 unresolved_reloc, warned); 2350 } 2351 2352 switch (r_type) 2353 { 2354 case R_390_GOTPLT12: 2355 case R_390_GOTPLT16: 2356 case R_390_GOTPLT20: 2357 case R_390_GOTPLT32: 2358 case R_390_GOTPLTENT: 2359 /* There are three cases for a GOTPLT relocation. 1) The 2360 relocation is against the jump slot entry of a plt that 2361 will get emitted to the output file. 2) The relocation 2362 is against the jump slot of a plt entry that has been 2363 removed. elf_s390_adjust_gotplt has created a GOT entry 2364 as replacement. 3) The relocation is against a local symbol. 2365 Cases 2) and 3) are the same as the GOT relocation code 2366 so we just have to test for case 1 and fall through for 2367 the other two. */ 2368 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2369 { 2370 bfd_vma plt_index; 2371 2372 /* Calc. index no. 2373 Current offset - size first entry / entry size. */ 2374 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2375 PLT_ENTRY_SIZE; 2376 2377 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 2378 addr & GOT addr. */ 2379 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2380 unresolved_reloc = FALSE; 2381 2382 if (r_type == R_390_GOTPLTENT) 2383 relocation += htab->sgot->output_section->vma; 2384 break; 2385 } 2386 /* Fall through. */ 2387 2388 case R_390_GOT12: 2389 case R_390_GOT16: 2390 case R_390_GOT20: 2391 case R_390_GOT32: 2392 case R_390_GOTENT: 2393 /* Relocation is to the entry for this symbol in the global 2394 offset table. */ 2395 if (htab->sgot == NULL) 2396 abort (); 2397 2398 if (h != NULL) 2399 { 2400 bfd_boolean dyn; 2401 2402 off = h->got.offset; 2403 dyn = htab->elf.dynamic_sections_created; 2404 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2405 || (info->shared 2406 && (info->symbolic 2407 || h->dynindx == -1 2408 || h->forced_local) 2409 && h->def_regular) 2410 || (ELF_ST_VISIBILITY (h->other) 2411 && h->root.type == bfd_link_hash_undefweak)) 2412 { 2413 /* This is actually a static link, or it is a 2414 -Bsymbolic link and the symbol is defined 2415 locally, or the symbol was forced to be local 2416 because of a version file. We must initialize 2417 this entry in the global offset table. Since the 2418 offset must always be a multiple of 2, we use the 2419 least significant bit to record whether we have 2420 initialized it already. 2421 2422 When doing a dynamic link, we create a .rel.got 2423 relocation entry to initialize the value. This 2424 is done in the finish_dynamic_symbol routine. */ 2425 if ((off & 1) != 0) 2426 off &= ~1; 2427 else 2428 { 2429 bfd_put_32 (output_bfd, relocation, 2430 htab->sgot->contents + off); 2431 h->got.offset |= 1; 2432 } 2433 } 2434 else 2435 unresolved_reloc = FALSE; 2436 } 2437 else 2438 { 2439 if (local_got_offsets == NULL) 2440 abort (); 2441 2442 off = local_got_offsets[r_symndx]; 2443 2444 /* The offset must always be a multiple of 4. We use 2445 the least significant bit to record whether we have 2446 already generated the necessary reloc. */ 2447 if ((off & 1) != 0) 2448 off &= ~1; 2449 else 2450 { 2451 bfd_put_32 (output_bfd, relocation, 2452 htab->sgot->contents + off); 2453 2454 if (info->shared) 2455 { 2456 asection *srelgot; 2457 Elf_Internal_Rela outrel; 2458 bfd_byte *loc; 2459 2460 srelgot = htab->srelgot; 2461 if (srelgot == NULL) 2462 abort (); 2463 2464 outrel.r_offset = (htab->sgot->output_section->vma 2465 + htab->sgot->output_offset 2466 + off); 2467 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2468 outrel.r_addend = relocation; 2469 loc = srelgot->contents; 2470 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 2471 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2472 } 2473 2474 local_got_offsets[r_symndx] |= 1; 2475 } 2476 } 2477 2478 if (off >= (bfd_vma) -2) 2479 abort (); 2480 2481 relocation = htab->sgot->output_offset + off; 2482 2483 /* For @GOTENT the relocation is against the offset between 2484 the instruction and the symbols entry in the GOT and not 2485 between the start of the GOT and the symbols entry. We 2486 add the vma of the GOT to get the correct value. */ 2487 if ( r_type == R_390_GOTENT 2488 || r_type == R_390_GOTPLTENT) 2489 relocation += htab->sgot->output_section->vma; 2490 2491 break; 2492 2493 case R_390_GOTOFF16: 2494 case R_390_GOTOFF32: 2495 /* Relocation is relative to the start of the global offset 2496 table. */ 2497 2498 /* Note that sgot->output_offset is not involved in this 2499 calculation. We always want the start of .got. If we 2500 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2501 permitted by the ABI, we might have to change this 2502 calculation. */ 2503 relocation -= htab->sgot->output_section->vma; 2504 break; 2505 2506 case R_390_GOTPC: 2507 case R_390_GOTPCDBL: 2508 /* Use global offset table as symbol value. */ 2509 relocation = htab->sgot->output_section->vma; 2510 unresolved_reloc = FALSE; 2511 break; 2512 2513 case R_390_PLT16DBL: 2514 case R_390_PLT32DBL: 2515 case R_390_PLT32: 2516 /* Relocation is to the entry for this symbol in the 2517 procedure linkage table. */ 2518 2519 /* Resolve a PLT32 reloc against a local symbol directly, 2520 without using the procedure linkage table. */ 2521 if (h == NULL) 2522 break; 2523 2524 if (h->plt.offset == (bfd_vma) -1 2525 || htab->splt == NULL) 2526 { 2527 /* We didn't make a PLT entry for this symbol. This 2528 happens when statically linking PIC code, or when 2529 using -Bsymbolic. */ 2530 break; 2531 } 2532 2533 relocation = (htab->splt->output_section->vma 2534 + htab->splt->output_offset 2535 + h->plt.offset); 2536 unresolved_reloc = FALSE; 2537 break; 2538 2539 case R_390_PLTOFF16: 2540 case R_390_PLTOFF32: 2541 /* Relocation is to the entry for this symbol in the 2542 procedure linkage table relative to the start of the GOT. */ 2543 2544 /* For local symbols or if we didn't make a PLT entry for 2545 this symbol resolve the symbol directly. */ 2546 if ( h == NULL 2547 || h->plt.offset == (bfd_vma) -1 2548 || htab->splt == NULL) 2549 { 2550 relocation -= htab->sgot->output_section->vma; 2551 break; 2552 } 2553 2554 relocation = (htab->splt->output_section->vma 2555 + htab->splt->output_offset 2556 + h->plt.offset 2557 - htab->sgot->output_section->vma); 2558 unresolved_reloc = FALSE; 2559 break; 2560 2561 case R_390_8: 2562 case R_390_16: 2563 case R_390_32: 2564 case R_390_PC16: 2565 case R_390_PC16DBL: 2566 case R_390_PC32DBL: 2567 case R_390_PC32: 2568 /* r_symndx will be zero only for relocs against symbols 2569 from removed linkonce sections, or sections discarded by 2570 a linker script. */ 2571 if (r_symndx == 0 2572 || (input_section->flags & SEC_ALLOC) == 0) 2573 break; 2574 2575 if ((info->shared 2576 && (h == NULL 2577 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2578 || h->root.type != bfd_link_hash_undefweak) 2579 && ((r_type != R_390_PC16 2580 && r_type != R_390_PC16DBL 2581 && r_type != R_390_PC32DBL 2582 && r_type != R_390_PC32) 2583 || (h != NULL 2584 && !SYMBOL_REFERENCES_LOCAL (info, h)))) 2585 || (ELIMINATE_COPY_RELOCS 2586 && !info->shared 2587 && h != NULL 2588 && h->dynindx != -1 2589 && !h->non_got_ref 2590 && ((h->def_dynamic 2591 && !h->def_regular) 2592 || h->root.type == bfd_link_hash_undefweak 2593 || h->root.type == bfd_link_hash_undefined))) 2594 { 2595 Elf_Internal_Rela outrel; 2596 bfd_boolean skip, relocate; 2597 asection *sreloc; 2598 bfd_byte *loc; 2599 2600 /* When generating a shared object, these relocations 2601 are copied into the output file to be resolved at run 2602 time. */ 2603 2604 skip = FALSE; 2605 relocate = FALSE; 2606 2607 outrel.r_offset = 2608 _bfd_elf_section_offset (output_bfd, info, input_section, 2609 rel->r_offset); 2610 if (outrel.r_offset == (bfd_vma) -1) 2611 skip = TRUE; 2612 else if (outrel.r_offset == (bfd_vma) -2) 2613 skip = TRUE, relocate = TRUE; 2614 outrel.r_offset += (input_section->output_section->vma 2615 + input_section->output_offset); 2616 2617 if (skip) 2618 memset (&outrel, 0, sizeof outrel); 2619 else if (h != NULL 2620 && h->dynindx != -1 2621 && (r_type == R_390_PC16 2622 || r_type == R_390_PC16DBL 2623 || r_type == R_390_PC32DBL 2624 || r_type == R_390_PC32 2625 || !info->shared 2626 || !info->symbolic 2627 || !h->def_regular)) 2628 { 2629 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2630 outrel.r_addend = rel->r_addend; 2631 } 2632 else 2633 { 2634 /* This symbol is local, or marked to become local. */ 2635 outrel.r_addend = relocation + rel->r_addend; 2636 if (r_type == R_390_32) 2637 { 2638 relocate = TRUE; 2639 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2640 } 2641 else 2642 { 2643 long sindx; 2644 2645 if (bfd_is_abs_section (sec)) 2646 sindx = 0; 2647 else if (sec == NULL || sec->owner == NULL) 2648 { 2649 bfd_set_error(bfd_error_bad_value); 2650 return FALSE; 2651 } 2652 else 2653 { 2654 asection *osec; 2655 2656 osec = sec->output_section; 2657 sindx = elf_section_data (osec)->dynindx; 2658 BFD_ASSERT (sindx > 0); 2659 2660 /* We are turning this relocation into one 2661 against a section symbol, so subtract out 2662 the output section's address but not the 2663 offset of the input section in the output 2664 section. */ 2665 2666 outrel.r_addend -= osec->vma; 2667 } 2668 outrel.r_info = ELF32_R_INFO (sindx, r_type); 2669 } 2670 } 2671 2672 sreloc = elf_section_data (input_section)->sreloc; 2673 if (sreloc == NULL) 2674 abort (); 2675 2676 loc = sreloc->contents; 2677 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2678 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2679 2680 /* If this reloc is against an external symbol, we do 2681 not want to fiddle with the addend. Otherwise, we 2682 need to include the symbol value so that it becomes 2683 an addend for the dynamic reloc. */ 2684 if (! relocate) 2685 continue; 2686 } 2687 break; 2688 2689 /* Relocations for tls literal pool entries. */ 2690 case R_390_TLS_IE32: 2691 if (info->shared) 2692 { 2693 Elf_Internal_Rela outrel; 2694 asection *sreloc; 2695 bfd_byte *loc; 2696 2697 outrel.r_offset = rel->r_offset 2698 + input_section->output_section->vma 2699 + input_section->output_offset; 2700 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2701 sreloc = elf_section_data (input_section)->sreloc; 2702 if (sreloc == NULL) 2703 abort (); 2704 loc = sreloc->contents; 2705 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2706 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2707 } 2708 /* Fall through. */ 2709 2710 case R_390_TLS_GD32: 2711 case R_390_TLS_GOTIE32: 2712 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2713 tls_type = GOT_UNKNOWN; 2714 if (h == NULL && local_got_offsets) 2715 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2716 else if (h != NULL) 2717 { 2718 tls_type = elf_s390_hash_entry(h)->tls_type; 2719 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2720 r_type = R_390_TLS_LE32; 2721 } 2722 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE) 2723 r_type = R_390_TLS_IE32; 2724 2725 if (r_type == R_390_TLS_LE32) 2726 { 2727 /* This relocation gets optimized away by the local exec 2728 access optimization. */ 2729 BFD_ASSERT (! unresolved_reloc); 2730 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2731 contents + rel->r_offset); 2732 continue; 2733 } 2734 2735 if (htab->sgot == NULL) 2736 abort (); 2737 2738 if (h != NULL) 2739 off = h->got.offset; 2740 else 2741 { 2742 if (local_got_offsets == NULL) 2743 abort (); 2744 2745 off = local_got_offsets[r_symndx]; 2746 } 2747 2748 emit_tls_relocs: 2749 2750 if ((off & 1) != 0) 2751 off &= ~1; 2752 else 2753 { 2754 Elf_Internal_Rela outrel; 2755 bfd_byte *loc; 2756 int dr_type, indx; 2757 2758 if (htab->srelgot == NULL) 2759 abort (); 2760 2761 outrel.r_offset = (htab->sgot->output_section->vma 2762 + htab->sgot->output_offset + off); 2763 2764 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2765 if (r_type == R_390_TLS_GD32) 2766 dr_type = R_390_TLS_DTPMOD; 2767 else 2768 dr_type = R_390_TLS_TPOFF; 2769 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2770 outrel.r_addend = relocation - dtpoff_base (info); 2771 else 2772 outrel.r_addend = 0; 2773 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2774 loc = htab->srelgot->contents; 2775 loc += htab->srelgot->reloc_count++ 2776 * sizeof (Elf32_External_Rela); 2777 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2778 2779 if (r_type == R_390_TLS_GD32) 2780 { 2781 if (indx == 0) 2782 { 2783 BFD_ASSERT (! unresolved_reloc); 2784 bfd_put_32 (output_bfd, 2785 relocation - dtpoff_base (info), 2786 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2787 } 2788 else 2789 { 2790 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF); 2791 outrel.r_offset += GOT_ENTRY_SIZE; 2792 outrel.r_addend = 0; 2793 htab->srelgot->reloc_count++; 2794 loc += sizeof (Elf32_External_Rela); 2795 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2796 } 2797 } 2798 2799 if (h != NULL) 2800 h->got.offset |= 1; 2801 else 2802 local_got_offsets[r_symndx] |= 1; 2803 } 2804 2805 if (off >= (bfd_vma) -2) 2806 abort (); 2807 if (r_type == ELF32_R_TYPE (rel->r_info)) 2808 { 2809 relocation = htab->sgot->output_offset + off; 2810 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT) 2811 relocation += htab->sgot->output_section->vma; 2812 unresolved_reloc = FALSE; 2813 } 2814 else 2815 { 2816 bfd_put_32 (output_bfd, htab->sgot->output_offset + off, 2817 contents + rel->r_offset); 2818 continue; 2819 } 2820 break; 2821 2822 case R_390_TLS_GOTIE12: 2823 case R_390_TLS_GOTIE20: 2824 case R_390_TLS_IEENT: 2825 if (h == NULL) 2826 { 2827 if (local_got_offsets == NULL) 2828 abort(); 2829 off = local_got_offsets[r_symndx]; 2830 if (info->shared) 2831 goto emit_tls_relocs; 2832 } 2833 else 2834 { 2835 off = h->got.offset; 2836 tls_type = elf_s390_hash_entry(h)->tls_type; 2837 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 2838 goto emit_tls_relocs; 2839 } 2840 2841 if (htab->sgot == NULL) 2842 abort (); 2843 2844 BFD_ASSERT (! unresolved_reloc); 2845 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2846 htab->sgot->contents + off); 2847 relocation = htab->sgot->output_offset + off; 2848 if (r_type == R_390_TLS_IEENT) 2849 relocation += htab->sgot->output_section->vma; 2850 unresolved_reloc = FALSE; 2851 break; 2852 2853 case R_390_TLS_LDM32: 2854 if (! info->shared) 2855 /* The literal pool entry this relocation refers to gets ignored 2856 by the optimized code of the local exec model. Do nothing 2857 and the value will turn out zero. */ 2858 continue; 2859 2860 if (htab->sgot == NULL) 2861 abort (); 2862 2863 off = htab->tls_ldm_got.offset; 2864 if (off & 1) 2865 off &= ~1; 2866 else 2867 { 2868 Elf_Internal_Rela outrel; 2869 bfd_byte *loc; 2870 2871 if (htab->srelgot == NULL) 2872 abort (); 2873 2874 outrel.r_offset = (htab->sgot->output_section->vma 2875 + htab->sgot->output_offset + off); 2876 2877 bfd_put_32 (output_bfd, 0, 2878 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2879 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD); 2880 outrel.r_addend = 0; 2881 loc = htab->srelgot->contents; 2882 loc += htab->srelgot->reloc_count++ 2883 * sizeof (Elf32_External_Rela); 2884 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2885 htab->tls_ldm_got.offset |= 1; 2886 } 2887 relocation = htab->sgot->output_offset + off; 2888 unresolved_reloc = FALSE; 2889 break; 2890 2891 case R_390_TLS_LE32: 2892 if (info->shared) 2893 { 2894 /* Linking a shared library with non-fpic code requires 2895 a R_390_TLS_TPOFF relocation. */ 2896 Elf_Internal_Rela outrel; 2897 asection *sreloc; 2898 bfd_byte *loc; 2899 int indx; 2900 2901 outrel.r_offset = rel->r_offset 2902 + input_section->output_section->vma 2903 + input_section->output_offset; 2904 if (h != NULL && h->dynindx != -1) 2905 indx = h->dynindx; 2906 else 2907 indx = 0; 2908 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF); 2909 if (indx == 0) 2910 outrel.r_addend = relocation - dtpoff_base (info); 2911 else 2912 outrel.r_addend = 0; 2913 sreloc = elf_section_data (input_section)->sreloc; 2914 if (sreloc == NULL) 2915 abort (); 2916 loc = sreloc->contents; 2917 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2918 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2919 } 2920 else 2921 { 2922 BFD_ASSERT (! unresolved_reloc); 2923 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2924 contents + rel->r_offset); 2925 } 2926 continue; 2927 2928 case R_390_TLS_LDO32: 2929 if (info->shared || (input_section->flags & SEC_CODE) == 0) 2930 relocation -= dtpoff_base (info); 2931 else 2932 /* When converting LDO to LE, we must negate. */ 2933 relocation = -tpoff (info, relocation); 2934 break; 2935 2936 /* Relocations for tls instructions. */ 2937 case R_390_TLS_LOAD: 2938 case R_390_TLS_GDCALL: 2939 case R_390_TLS_LDCALL: 2940 tls_type = GOT_UNKNOWN; 2941 if (h == NULL && local_got_offsets) 2942 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2943 else if (h != NULL) 2944 tls_type = elf_s390_hash_entry(h)->tls_type; 2945 2946 if (tls_type == GOT_TLS_GD) 2947 continue; 2948 2949 if (r_type == R_390_TLS_LOAD) 2950 { 2951 if (!info->shared && (h == NULL || h->dynindx == -1)) 2952 { 2953 /* IE->LE transition. Four valid cases: 2954 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 2955 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 2956 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 2957 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 2958 unsigned int insn, ry; 2959 2960 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 2961 ry = 0; 2962 if ((insn & 0xff00f000) == 0x58000000) 2963 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */ 2964 ry = (insn & 0x000f0000); 2965 else if ((insn & 0xff0f0000) == 0x58000000) 2966 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */ 2967 ry = (insn & 0x0000f000) << 4; 2968 else if ((insn & 0xff00f000) == 0x5800c000) 2969 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */ 2970 ry = (insn & 0x000f0000); 2971 else if ((insn & 0xff0f0000) == 0x580c0000) 2972 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 2973 ry = (insn & 0x0000f000) << 4; 2974 else 2975 invalid_tls_insn (input_bfd, input_section, rel); 2976 insn = 0x18000700 | (insn & 0x00f00000) | ry; 2977 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 2978 } 2979 } 2980 else if (r_type == R_390_TLS_GDCALL) 2981 { 2982 unsigned int insn; 2983 2984 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 2985 if ((insn & 0xff000fff) != 0x4d000000) 2986 invalid_tls_insn (input_bfd, input_section, rel); 2987 if (!info->shared && (h == NULL || h->dynindx == -1)) 2988 /* GD->LE transition. 2989 bas %r14,0(%rx,%r13) -> bc 0,0 */ 2990 insn = 0x47000000; 2991 else 2992 /* GD->IE transition. 2993 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */ 2994 insn = 0x5822c000; 2995 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 2996 } 2997 else if (r_type == R_390_TLS_LDCALL) 2998 { 2999 if (!info->shared) 3000 { 3001 unsigned int insn; 3002 3003 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3004 if ((insn & 0xff000fff) != 0x4d000000) 3005 invalid_tls_insn (input_bfd, input_section, rel); 3006 /* LD->LE transition. 3007 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3008 insn = 0x47000000; 3009 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3010 } 3011 } 3012 continue; 3013 3014 default: 3015 break; 3016 } 3017 3018 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3019 because such sections are not SEC_ALLOC and thus ld.so will 3020 not process them. */ 3021 if (unresolved_reloc 3022 && !((input_section->flags & SEC_DEBUGGING) != 0 3023 && h->def_dynamic)) 3024 (*_bfd_error_handler) 3025 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3026 input_bfd, 3027 input_section, 3028 (long) rel->r_offset, 3029 howto->name, 3030 h->root.root.string); 3031 3032 if (r_type == R_390_20 3033 || r_type == R_390_GOT20 3034 || r_type == R_390_GOTPLT20 3035 || r_type == R_390_TLS_GOTIE20) 3036 { 3037 relocation += rel->r_addend; 3038 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3039 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3040 contents, rel->r_offset, 3041 relocation, 0); 3042 } 3043 else 3044 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3045 contents, rel->r_offset, 3046 relocation, rel->r_addend); 3047 3048 if (r != bfd_reloc_ok) 3049 { 3050 const char *name; 3051 3052 if (h != NULL) 3053 name = h->root.root.string; 3054 else 3055 { 3056 name = bfd_elf_string_from_elf_section (input_bfd, 3057 symtab_hdr->sh_link, 3058 sym->st_name); 3059 if (name == NULL) 3060 return FALSE; 3061 if (*name == '\0') 3062 name = bfd_section_name (input_bfd, sec); 3063 } 3064 3065 if (r == bfd_reloc_overflow) 3066 { 3067 3068 if (! ((*info->callbacks->reloc_overflow) 3069 (info, (h ? &h->root : NULL), name, howto->name, 3070 (bfd_vma) 0, input_bfd, input_section, 3071 rel->r_offset))) 3072 return FALSE; 3073 } 3074 else 3075 { 3076 (*_bfd_error_handler) 3077 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3078 input_bfd, input_section, 3079 (long) rel->r_offset, name, (int) r); 3080 return FALSE; 3081 } 3082 } 3083 } 3084 3085 return TRUE; 3086} 3087 3088/* Finish up dynamic symbol handling. We set the contents of various 3089 dynamic sections here. */ 3090 3091static bfd_boolean 3092elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) 3093 bfd *output_bfd; 3094 struct bfd_link_info *info; 3095 struct elf_link_hash_entry *h; 3096 Elf_Internal_Sym *sym; 3097{ 3098 struct elf_s390_link_hash_table *htab; 3099 3100 htab = elf_s390_hash_table (info); 3101 3102 if (h->plt.offset != (bfd_vma) -1) 3103 { 3104 bfd_vma plt_index; 3105 bfd_vma got_offset; 3106 Elf_Internal_Rela rela; 3107 bfd_byte *loc; 3108 bfd_vma relative_offset; 3109 3110 /* This symbol has an entry in the procedure linkage table. Set 3111 it up. */ 3112 if (h->dynindx == -1 3113 || htab->splt == NULL 3114 || htab->sgotplt == NULL 3115 || htab->srelplt == NULL) 3116 abort (); 3117 3118 /* Calc. index no. 3119 Current offset - size first entry / entry size. */ 3120 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3121 3122 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 3123 addr & GOT addr. */ 3124 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3125 3126 /* S390 uses halfwords for relative branch calc! */ 3127 relative_offset = - ((PLT_FIRST_ENTRY_SIZE + 3128 (PLT_ENTRY_SIZE * plt_index) + 18) / 2); 3129 /* If offset is > 32768, branch to a previous branch 3130 390 can only handle +-64 K jumps. */ 3131 if ( -32768 > (int) relative_offset ) 3132 relative_offset 3133 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3134 3135 /* Fill in the entry in the procedure linkage table. */ 3136 if (!info->shared) 3137 { 3138 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0, 3139 htab->splt->contents + h->plt.offset); 3140 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, 3141 htab->splt->contents + h->plt.offset + 4); 3142 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, 3143 htab->splt->contents + h->plt.offset + 8); 3144 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, 3145 htab->splt->contents + h->plt.offset + 12); 3146 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, 3147 htab->splt->contents + h->plt.offset + 16); 3148 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3149 htab->splt->contents + h->plt.offset + 20); 3150 bfd_put_32 (output_bfd, 3151 (htab->sgotplt->output_section->vma 3152 + htab->sgotplt->output_offset 3153 + got_offset), 3154 htab->splt->contents + h->plt.offset + 24); 3155 } 3156 else if (got_offset < 4096) 3157 { 3158 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset, 3159 htab->splt->contents + h->plt.offset); 3160 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1, 3161 htab->splt->contents + h->plt.offset + 4); 3162 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2, 3163 htab->splt->contents + h->plt.offset + 8); 3164 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3, 3165 htab->splt->contents + h->plt.offset + 12); 3166 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4, 3167 htab->splt->contents + h->plt.offset + 16); 3168 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3169 htab->splt->contents + h->plt.offset + 20); 3170 bfd_put_32 (output_bfd, (bfd_vma) 0, 3171 htab->splt->contents + h->plt.offset + 24); 3172 } 3173 else if (got_offset < 32768) 3174 { 3175 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset, 3176 htab->splt->contents + h->plt.offset); 3177 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1, 3178 htab->splt->contents + h->plt.offset + 4); 3179 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2, 3180 htab->splt->contents + h->plt.offset + 8); 3181 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3, 3182 htab->splt->contents + h->plt.offset + 12); 3183 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4, 3184 htab->splt->contents + h->plt.offset + 16); 3185 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3186 htab->splt->contents + h->plt.offset + 20); 3187 bfd_put_32 (output_bfd, (bfd_vma) 0, 3188 htab->splt->contents + h->plt.offset + 24); 3189 } 3190 else 3191 { 3192 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0, 3193 htab->splt->contents + h->plt.offset); 3194 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1, 3195 htab->splt->contents + h->plt.offset + 4); 3196 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2, 3197 htab->splt->contents + h->plt.offset + 8); 3198 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3, 3199 htab->splt->contents + h->plt.offset + 12); 3200 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4, 3201 htab->splt->contents + h->plt.offset + 16); 3202 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3203 htab->splt->contents + h->plt.offset + 20); 3204 bfd_put_32 (output_bfd, got_offset, 3205 htab->splt->contents + h->plt.offset + 24); 3206 } 3207 /* Insert offset into reloc. table here. */ 3208 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 3209 htab->splt->contents + h->plt.offset + 28); 3210 3211 /* Fill in the entry in the global offset table. 3212 Points to instruction after GOT offset. */ 3213 bfd_put_32 (output_bfd, 3214 (htab->splt->output_section->vma 3215 + htab->splt->output_offset 3216 + h->plt.offset 3217 + 12), 3218 htab->sgotplt->contents + got_offset); 3219 3220 /* Fill in the entry in the .rela.plt section. */ 3221 rela.r_offset = (htab->sgotplt->output_section->vma 3222 + htab->sgotplt->output_offset 3223 + got_offset); 3224 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3225 rela.r_addend = 0; 3226 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela); 3227 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3228 3229 if (!h->def_regular) 3230 { 3231 /* Mark the symbol as undefined, rather than as defined in 3232 the .plt section. Leave the value alone. This is a clue 3233 for the dynamic linker, to make function pointer 3234 comparisons work between an application and shared 3235 library. */ 3236 sym->st_shndx = SHN_UNDEF; 3237 } 3238 } 3239 3240 if (h->got.offset != (bfd_vma) -1 3241 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3242 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3243 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3244 { 3245 Elf_Internal_Rela rela; 3246 bfd_byte *loc; 3247 3248 /* This symbol has an entry in the global offset table. Set it 3249 up. */ 3250 3251 if (htab->sgot == NULL || htab->srelgot == NULL) 3252 abort (); 3253 3254 rela.r_offset = (htab->sgot->output_section->vma 3255 + htab->sgot->output_offset 3256 + (h->got.offset &~ (bfd_vma) 1)); 3257 3258 /* If this is a static link, or it is a -Bsymbolic link and the 3259 symbol is defined locally or was forced to be local because 3260 of a version file, we just want to emit a RELATIVE reloc. 3261 The entry in the global offset table will already have been 3262 initialized in the relocate_section function. */ 3263 if (info->shared 3264 && (info->symbolic 3265 || h->dynindx == -1 3266 || h->forced_local) 3267 && h->def_regular) 3268 { 3269 BFD_ASSERT((h->got.offset & 1) != 0); 3270 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 3271 rela.r_addend = (h->root.u.def.value 3272 + h->root.u.def.section->output_section->vma 3273 + h->root.u.def.section->output_offset); 3274 } 3275 else 3276 { 3277 BFD_ASSERT((h->got.offset & 1) == 0); 3278 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset); 3279 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT); 3280 rela.r_addend = 0; 3281 } 3282 3283 loc = htab->srelgot->contents; 3284 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3285 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3286 } 3287 3288 if (h->needs_copy) 3289 { 3290 Elf_Internal_Rela rela; 3291 bfd_byte *loc; 3292 3293 /* This symbols needs a copy reloc. Set it up. */ 3294 3295 if (h->dynindx == -1 3296 || (h->root.type != bfd_link_hash_defined 3297 && h->root.type != bfd_link_hash_defweak) 3298 || htab->srelbss == NULL) 3299 abort (); 3300 3301 rela.r_offset = (h->root.u.def.value 3302 + h->root.u.def.section->output_section->vma 3303 + h->root.u.def.section->output_offset); 3304 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY); 3305 rela.r_addend = 0; 3306 loc = htab->srelbss->contents; 3307 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela); 3308 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3309 } 3310 3311 /* Mark some specially defined symbols as absolute. */ 3312 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3313 || h == htab->elf.hgot 3314 || h == htab->elf.hplt) 3315 sym->st_shndx = SHN_ABS; 3316 3317 return TRUE; 3318} 3319 3320/* Used to decide how to sort relocs in an optimal manner for the 3321 dynamic linker, before writing them out. */ 3322 3323static enum elf_reloc_type_class 3324elf_s390_reloc_type_class (rela) 3325 const Elf_Internal_Rela *rela; 3326{ 3327 switch ((int) ELF32_R_TYPE (rela->r_info)) 3328 { 3329 case R_390_RELATIVE: 3330 return reloc_class_relative; 3331 case R_390_JMP_SLOT: 3332 return reloc_class_plt; 3333 case R_390_COPY: 3334 return reloc_class_copy; 3335 default: 3336 return reloc_class_normal; 3337 } 3338} 3339 3340/* Finish up the dynamic sections. */ 3341 3342static bfd_boolean 3343elf_s390_finish_dynamic_sections (output_bfd, info) 3344 bfd *output_bfd; 3345 struct bfd_link_info *info; 3346{ 3347 struct elf_s390_link_hash_table *htab; 3348 bfd *dynobj; 3349 asection *sdyn; 3350 3351 htab = elf_s390_hash_table (info); 3352 dynobj = htab->elf.dynobj; 3353 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3354 3355 if (htab->elf.dynamic_sections_created) 3356 { 3357 Elf32_External_Dyn *dyncon, *dynconend; 3358 3359 if (sdyn == NULL || htab->sgot == NULL) 3360 abort (); 3361 3362 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3363 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3364 for (; dyncon < dynconend; dyncon++) 3365 { 3366 Elf_Internal_Dyn dyn; 3367 asection *s; 3368 3369 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3370 3371 switch (dyn.d_tag) 3372 { 3373 default: 3374 continue; 3375 3376 case DT_PLTGOT: 3377 dyn.d_un.d_ptr = htab->sgot->output_section->vma; 3378 break; 3379 3380 case DT_JMPREL: 3381 dyn.d_un.d_ptr = htab->srelplt->output_section->vma; 3382 break; 3383 3384 case DT_PLTRELSZ: 3385 s = htab->srelplt->output_section; 3386 dyn.d_un.d_val = s->size; 3387 break; 3388 } 3389 3390 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3391 } 3392 3393 /* Fill in the special first entry in the procedure linkage table. */ 3394 if (htab->splt && htab->splt->size > 0) 3395 { 3396 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE); 3397 if (info->shared) 3398 { 3399 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0, 3400 htab->splt->contents ); 3401 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1, 3402 htab->splt->contents +4 ); 3403 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2, 3404 htab->splt->contents +8 ); 3405 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3, 3406 htab->splt->contents +12 ); 3407 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4, 3408 htab->splt->contents +16 ); 3409 } 3410 else 3411 { 3412 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0, 3413 htab->splt->contents ); 3414 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, 3415 htab->splt->contents +4 ); 3416 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2, 3417 htab->splt->contents +8 ); 3418 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, 3419 htab->splt->contents +12 ); 3420 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, 3421 htab->splt->contents +16 ); 3422 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, 3423 htab->splt->contents +20 ); 3424 bfd_put_32 (output_bfd, 3425 htab->sgotplt->output_section->vma 3426 + htab->sgotplt->output_offset, 3427 htab->splt->contents + 24); 3428 } 3429 elf_section_data (htab->splt->output_section) 3430 ->this_hdr.sh_entsize = 4; 3431 } 3432 3433 } 3434 3435 if (htab->sgotplt) 3436 { 3437 /* Fill in the first three entries in the global offset table. */ 3438 if (htab->sgotplt->size > 0) 3439 { 3440 bfd_put_32 (output_bfd, 3441 (sdyn == NULL ? (bfd_vma) 0 3442 : sdyn->output_section->vma + sdyn->output_offset), 3443 htab->sgotplt->contents); 3444 /* One entry for shared object struct ptr. */ 3445 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4); 3446 /* One entry for _dl_runtime_resolve. */ 3447 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); 3448 } 3449 3450 elf_section_data (htab->sgotplt->output_section) 3451 ->this_hdr.sh_entsize = 4; 3452 } 3453 return TRUE; 3454} 3455 3456static bfd_boolean 3457elf_s390_grok_prstatus (abfd, note) 3458 bfd * abfd; 3459 Elf_Internal_Note * note; 3460{ 3461 int offset; 3462 unsigned int size; 3463 3464 switch (note->descsz) 3465 { 3466 default: 3467 return FALSE; 3468 3469 case 224: /* S/390 Linux. */ 3470 /* pr_cursig */ 3471 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 3472 3473 /* pr_pid */ 3474 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 3475 3476 /* pr_reg */ 3477 offset = 72; 3478 size = 144; 3479 break; 3480 } 3481 3482 /* Make a ".reg/999" section. */ 3483 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3484 size, note->descpos + offset); 3485} 3486 3487/* Return address for Ith PLT stub in section PLT, for relocation REL 3488 or (bfd_vma) -1 if it should not be included. */ 3489 3490static bfd_vma 3491elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3492 const arelent *rel ATTRIBUTE_UNUSED) 3493{ 3494 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3495} 3496 3497 3498#define TARGET_BIG_SYM bfd_elf32_s390_vec 3499#define TARGET_BIG_NAME "elf32-s390" 3500#define ELF_ARCH bfd_arch_s390 3501#define ELF_MACHINE_CODE EM_S390 3502#define ELF_MACHINE_ALT1 EM_S390_OLD 3503#define ELF_MAXPAGESIZE 0x1000 3504 3505#define elf_backend_can_gc_sections 1 3506#define elf_backend_can_refcount 1 3507#define elf_backend_want_got_plt 1 3508#define elf_backend_plt_readonly 1 3509#define elf_backend_want_plt_sym 0 3510#define elf_backend_got_header_size 12 3511#define elf_backend_rela_normal 1 3512 3513#define elf_info_to_howto elf_s390_info_to_howto 3514 3515#define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name 3516#define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create 3517#define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3518 3519#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3520#define elf_backend_check_relocs elf_s390_check_relocs 3521#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3522#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 3523#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3524#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3525#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3526#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 3527#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3528#define elf_backend_relocate_section elf_s390_relocate_section 3529#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 3530#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3531#define elf_backend_grok_prstatus elf_s390_grok_prstatus 3532#define elf_backend_plt_sym_val elf_s390_plt_sym_val 3533 3534#define bfd_elf32_mkobject elf_s390_mkobject 3535#define elf_backend_object_p elf_s390_object_p 3536 3537#include "elf32-target.h" 3538