1/* IBM S/390-specific support for 64-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 3 Free Software Foundation, Inc. 4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com). 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 int elf_s390_tls_transition 81 PARAMS ((struct bfd_link_info *, int, int)); 82static bfd_reloc_status_type s390_tls_reloc 83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 84static bfd_vma dtpoff_base 85 PARAMS ((struct bfd_link_info *)); 86static bfd_vma tpoff 87 PARAMS ((struct bfd_link_info *, bfd_vma)); 88static void invalid_tls_insn 89 PARAMS ((bfd *, asection *, Elf_Internal_Rela *)); 90static bfd_reloc_status_type s390_elf_ldisp_reloc 91 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 92 93#include "elf/s390.h" 94 95/* In case we're on a 32-bit machine, construct a 64-bit "-1" value 96 from smaller values. Start with zero, widen, *then* decrement. */ 97#define MINUS_ONE (((bfd_vma)0) - 1) 98 99/* The relocation "howto" table. */ 100static reloc_howto_type elf_howto_table[] = 101{ 102 HOWTO (R_390_NONE, /* type */ 103 0, /* rightshift */ 104 0, /* size (0 = byte, 1 = short, 2 = long) */ 105 0, /* bitsize */ 106 FALSE, /* pc_relative */ 107 0, /* bitpos */ 108 complain_overflow_dont, /* complain_on_overflow */ 109 bfd_elf_generic_reloc, /* special_function */ 110 "R_390_NONE", /* name */ 111 FALSE, /* partial_inplace */ 112 0, /* src_mask */ 113 0, /* dst_mask */ 114 FALSE), /* pcrel_offset */ 115 116 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 118 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 119 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 120 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 121 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 122 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 123 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 124 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 125 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 126 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 128 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 129 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 130 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 131 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 132 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 133 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE), 134 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 135 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE), 136 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 137 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE), 138 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 139 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE), 140 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 141 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE), 142 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 143 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE), 144 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 145 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 146 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 147 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 148 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 149 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 150 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 151 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 152 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 153 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 154 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 155 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 156 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 157 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE), 158 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 159 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE), 160 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 161 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE), 162 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 163 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE), 164 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 165 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE), 166 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 167 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE), 168 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 169 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 170 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 171 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE), 172 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 173 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 174 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 175 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 176 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 177 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 178 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 179 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE), 180 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 181 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE), 182 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 183 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 184 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 185 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 186 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 187 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE), 188 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 189 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 190 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 191 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 192 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 193 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 194 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */ 195 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 196 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE), 197 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 198 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 199 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */ 200 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 201 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE), 202 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */ 203 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 204 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE), 205 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */ 206 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 207 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE), 208 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 209 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE), 210 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */ 211 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 212 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE), 213 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */ 214 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 215 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE), 216 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 217 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE), 218 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 219 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE), 220 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 221 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE), 222 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 223 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 224 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 225 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 226 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 227 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 228 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 229 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 230}; 231 232/* GNU extension to record C++ vtable hierarchy. */ 233static reloc_howto_type elf64_s390_vtinherit_howto = 234 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 235static reloc_howto_type elf64_s390_vtentry_howto = 236 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE); 237 238static reloc_howto_type * 239elf_s390_reloc_type_lookup (abfd, code) 240 bfd *abfd ATTRIBUTE_UNUSED; 241 bfd_reloc_code_real_type code; 242{ 243 switch (code) 244 { 245 case BFD_RELOC_NONE: 246 return &elf_howto_table[(int) R_390_NONE]; 247 case BFD_RELOC_8: 248 return &elf_howto_table[(int) R_390_8]; 249 case BFD_RELOC_390_12: 250 return &elf_howto_table[(int) R_390_12]; 251 case BFD_RELOC_16: 252 return &elf_howto_table[(int) R_390_16]; 253 case BFD_RELOC_32: 254 return &elf_howto_table[(int) R_390_32]; 255 case BFD_RELOC_CTOR: 256 return &elf_howto_table[(int) R_390_32]; 257 case BFD_RELOC_32_PCREL: 258 return &elf_howto_table[(int) R_390_PC32]; 259 case BFD_RELOC_390_GOT12: 260 return &elf_howto_table[(int) R_390_GOT12]; 261 case BFD_RELOC_32_GOT_PCREL: 262 return &elf_howto_table[(int) R_390_GOT32]; 263 case BFD_RELOC_390_PLT32: 264 return &elf_howto_table[(int) R_390_PLT32]; 265 case BFD_RELOC_390_COPY: 266 return &elf_howto_table[(int) R_390_COPY]; 267 case BFD_RELOC_390_GLOB_DAT: 268 return &elf_howto_table[(int) R_390_GLOB_DAT]; 269 case BFD_RELOC_390_JMP_SLOT: 270 return &elf_howto_table[(int) R_390_JMP_SLOT]; 271 case BFD_RELOC_390_RELATIVE: 272 return &elf_howto_table[(int) R_390_RELATIVE]; 273 case BFD_RELOC_32_GOTOFF: 274 return &elf_howto_table[(int) R_390_GOTOFF32]; 275 case BFD_RELOC_390_GOTPC: 276 return &elf_howto_table[(int) R_390_GOTPC]; 277 case BFD_RELOC_390_GOT16: 278 return &elf_howto_table[(int) R_390_GOT16]; 279 case BFD_RELOC_16_PCREL: 280 return &elf_howto_table[(int) R_390_PC16]; 281 case BFD_RELOC_390_PC16DBL: 282 return &elf_howto_table[(int) R_390_PC16DBL]; 283 case BFD_RELOC_390_PLT16DBL: 284 return &elf_howto_table[(int) R_390_PLT16DBL]; 285 case BFD_RELOC_390_PC32DBL: 286 return &elf_howto_table[(int) R_390_PC32DBL]; 287 case BFD_RELOC_390_PLT32DBL: 288 return &elf_howto_table[(int) R_390_PLT32DBL]; 289 case BFD_RELOC_390_GOTPCDBL: 290 return &elf_howto_table[(int) R_390_GOTPCDBL]; 291 case BFD_RELOC_64: 292 return &elf_howto_table[(int) R_390_64]; 293 case BFD_RELOC_64_PCREL: 294 return &elf_howto_table[(int) R_390_PC64]; 295 case BFD_RELOC_390_GOT64: 296 return &elf_howto_table[(int) R_390_GOT64]; 297 case BFD_RELOC_390_PLT64: 298 return &elf_howto_table[(int) R_390_PLT64]; 299 case BFD_RELOC_390_GOTENT: 300 return &elf_howto_table[(int) R_390_GOTENT]; 301 case BFD_RELOC_16_GOTOFF: 302 return &elf_howto_table[(int) R_390_GOTOFF16]; 303 case BFD_RELOC_390_GOTOFF64: 304 return &elf_howto_table[(int) R_390_GOTOFF64]; 305 case BFD_RELOC_390_GOTPLT12: 306 return &elf_howto_table[(int) R_390_GOTPLT12]; 307 case BFD_RELOC_390_GOTPLT16: 308 return &elf_howto_table[(int) R_390_GOTPLT16]; 309 case BFD_RELOC_390_GOTPLT32: 310 return &elf_howto_table[(int) R_390_GOTPLT32]; 311 case BFD_RELOC_390_GOTPLT64: 312 return &elf_howto_table[(int) R_390_GOTPLT64]; 313 case BFD_RELOC_390_GOTPLTENT: 314 return &elf_howto_table[(int) R_390_GOTPLTENT]; 315 case BFD_RELOC_390_PLTOFF16: 316 return &elf_howto_table[(int) R_390_PLTOFF16]; 317 case BFD_RELOC_390_PLTOFF32: 318 return &elf_howto_table[(int) R_390_PLTOFF32]; 319 case BFD_RELOC_390_PLTOFF64: 320 return &elf_howto_table[(int) R_390_PLTOFF64]; 321 case BFD_RELOC_390_TLS_LOAD: 322 return &elf_howto_table[(int) R_390_TLS_LOAD]; 323 case BFD_RELOC_390_TLS_GDCALL: 324 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 325 case BFD_RELOC_390_TLS_LDCALL: 326 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 327 case BFD_RELOC_390_TLS_GD64: 328 return &elf_howto_table[(int) R_390_TLS_GD64]; 329 case BFD_RELOC_390_TLS_GOTIE12: 330 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 331 case BFD_RELOC_390_TLS_GOTIE64: 332 return &elf_howto_table[(int) R_390_TLS_GOTIE64]; 333 case BFD_RELOC_390_TLS_LDM64: 334 return &elf_howto_table[(int) R_390_TLS_LDM64]; 335 case BFD_RELOC_390_TLS_IE64: 336 return &elf_howto_table[(int) R_390_TLS_IE64]; 337 case BFD_RELOC_390_TLS_IEENT: 338 return &elf_howto_table[(int) R_390_TLS_IEENT]; 339 case BFD_RELOC_390_TLS_LE64: 340 return &elf_howto_table[(int) R_390_TLS_LE64]; 341 case BFD_RELOC_390_TLS_LDO64: 342 return &elf_howto_table[(int) R_390_TLS_LDO64]; 343 case BFD_RELOC_390_TLS_DTPMOD: 344 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 345 case BFD_RELOC_390_TLS_DTPOFF: 346 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 347 case BFD_RELOC_390_TLS_TPOFF: 348 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 349 case BFD_RELOC_390_20: 350 return &elf_howto_table[(int) R_390_20]; 351 case BFD_RELOC_390_GOT20: 352 return &elf_howto_table[(int) R_390_GOT20]; 353 case BFD_RELOC_390_GOTPLT20: 354 return &elf_howto_table[(int) R_390_GOTPLT20]; 355 case BFD_RELOC_390_TLS_GOTIE20: 356 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 357 case BFD_RELOC_VTABLE_INHERIT: 358 return &elf64_s390_vtinherit_howto; 359 case BFD_RELOC_VTABLE_ENTRY: 360 return &elf64_s390_vtentry_howto; 361 default: 362 break; 363 } 364 return 0; 365} 366 367/* We need to use ELF64_R_TYPE so we have our own copy of this function, 368 and elf64-s390.c has its own copy. */ 369 370static void 371elf_s390_info_to_howto (abfd, cache_ptr, dst) 372 bfd *abfd ATTRIBUTE_UNUSED; 373 arelent *cache_ptr; 374 Elf_Internal_Rela *dst; 375{ 376 unsigned int r_type = ELF64_R_TYPE(dst->r_info); 377 switch (r_type) 378 { 379 case R_390_GNU_VTINHERIT: 380 cache_ptr->howto = &elf64_s390_vtinherit_howto; 381 break; 382 383 case R_390_GNU_VTENTRY: 384 cache_ptr->howto = &elf64_s390_vtentry_howto; 385 break; 386 387 default: 388 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 389 { 390 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 391 abfd, (int) r_type); 392 r_type = R_390_NONE; 393 } 394 cache_ptr->howto = &elf_howto_table[r_type]; 395 } 396} 397 398/* A relocation function which doesn't do anything. */ 399static bfd_reloc_status_type 400s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section, 401 output_bfd, error_message) 402 bfd *abfd ATTRIBUTE_UNUSED; 403 arelent *reloc_entry; 404 asymbol *symbol ATTRIBUTE_UNUSED; 405 PTR data ATTRIBUTE_UNUSED; 406 asection *input_section; 407 bfd *output_bfd; 408 char **error_message ATTRIBUTE_UNUSED; 409{ 410 if (output_bfd) 411 reloc_entry->address += input_section->output_offset; 412 return bfd_reloc_ok; 413} 414 415/* Handle the large displacement relocs. */ 416static bfd_reloc_status_type 417s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section, 418 output_bfd, error_message) 419 bfd *abfd; 420 arelent *reloc_entry; 421 asymbol *symbol; 422 PTR data; 423 asection *input_section; 424 bfd *output_bfd; 425 char **error_message ATTRIBUTE_UNUSED; 426{ 427 reloc_howto_type *howto = reloc_entry->howto; 428 bfd_vma relocation; 429 bfd_vma insn; 430 431 if (output_bfd != (bfd *) NULL 432 && (symbol->flags & BSF_SECTION_SYM) == 0 433 && (! howto->partial_inplace 434 || reloc_entry->addend == 0)) 435 { 436 reloc_entry->address += input_section->output_offset; 437 return bfd_reloc_ok; 438 } 439 if (output_bfd != NULL) 440 return bfd_reloc_continue; 441 442 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 443 return bfd_reloc_outofrange; 444 445 relocation = (symbol->value 446 + symbol->section->output_section->vma 447 + symbol->section->output_offset); 448 relocation += reloc_entry->addend; 449 if (howto->pc_relative) 450 { 451 relocation -= (input_section->output_section->vma 452 + input_section->output_offset); 453 relocation -= reloc_entry->address; 454 } 455 456 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 457 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 458 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 459 460 if ((bfd_signed_vma) relocation < - 0x80000 461 || (bfd_signed_vma) relocation > 0x7ffff) 462 return bfd_reloc_overflow; 463 else 464 return bfd_reloc_ok; 465} 466 467static bfd_boolean 468elf_s390_is_local_label_name (abfd, name) 469 bfd *abfd; 470 const char *name; 471{ 472 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 473 return TRUE; 474 475 return _bfd_elf_is_local_label_name (abfd, name); 476} 477 478/* Functions for the 390 ELF linker. */ 479 480/* The name of the dynamic interpreter. This is put in the .interp 481 section. */ 482 483#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 484 485/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 486 copying dynamic variables from a shared lib into an app's dynbss 487 section, and instead use a dynamic relocation to point into the 488 shared lib. */ 489#define ELIMINATE_COPY_RELOCS 1 490 491/* The size in bytes of the first entry in the procedure linkage table. */ 492#define PLT_FIRST_ENTRY_SIZE 32 493/* The size in bytes of an entry in the procedure linkage table. */ 494#define PLT_ENTRY_SIZE 32 495 496#define GOT_ENTRY_SIZE 8 497 498/* The first three entries in a procedure linkage table are reserved, 499 and the initial contents are unimportant (we zero them out). 500 Subsequent entries look like this. See the SVR4 ABI 386 501 supplement to see how this works. */ 502 503/* For the s390, simple addr offset can only be 0 - 4096. 504 To use the full 16777216 TB address space, several instructions 505 are needed to load an address in a register and execute 506 a branch( or just saving the address) 507 508 Furthermore, only r 0 and 1 are free to use!!! */ 509 510/* The first 3 words in the GOT are then reserved. 511 Word 0 is the address of the dynamic table. 512 Word 1 is a pointer to a structure describing the object 513 Word 2 is used to point to the loader entry address. 514 515 The code for PLT entries looks like this: 516 517 The GOT holds the address in the PLT to be executed. 518 The loader then gets: 519 24(15) = Pointer to the structure describing the object. 520 28(15) = Offset in symbol table 521 The loader must then find the module where the function is 522 and insert the address in the GOT. 523 524 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 525 LG 1,0(1) # 6 bytes Load address from GOT in r1 526 BCR 15,1 # 2 bytes Jump to address 527 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 528 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 529 BRCL 15,-x # 6 bytes Jump to start of PLT 530 .long ? # 4 bytes offset into symbol table 531 532 Total = 32 bytes per PLT entry 533 Fixup at offset 2: relative address to GOT entry 534 Fixup at offset 22: relative branch to PLT0 535 Fixup at offset 28: 32 bit offset into symbol table 536 537 A 32 bit offset into the symbol table is enough. It allows for symbol 538 tables up to a size of 2 gigabyte. A single dynamic object (the main 539 program, any shared library) is limited to 4GB in size and I want to see 540 the program that manages to have a symbol table of more than 2 GB with a 541 total size of at max 4 GB. */ 542 543#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000 544#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 545#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 546#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 547#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c 548#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 549#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 550#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000 551 552/* The first PLT entry pushes the offset into the symbol table 553 from R1 onto the stack at 8(15) and the loader object info 554 at 12(15), loads the loader address in R1 and jumps to it. */ 555 556/* The first entry in the PLT: 557 558 PLT0: 559 STG 1,56(15) # r1 contains the offset into the symbol table 560 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table 561 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack 562 LG 1,16(1) # get entry address of loader 563 BCR 15,1 # jump to loader 564 565 Fixup at offset 8: relative address to start of GOT. */ 566 567#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038 568#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 569#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 570#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 571#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 572#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 573#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 574#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 575 576/* The s390 linker needs to keep track of the number of relocs that it 577 decides to copy as dynamic relocs in check_relocs for each symbol. 578 This is so that it can later discard them if they are found to be 579 unnecessary. We store the information in a field extending the 580 regular ELF linker hash table. */ 581 582struct elf_s390_dyn_relocs 583{ 584 struct elf_s390_dyn_relocs *next; 585 586 /* The input section of the reloc. */ 587 asection *sec; 588 589 /* Total number of relocs copied for the input section. */ 590 bfd_size_type count; 591 592 /* Number of pc-relative relocs copied for the input section. */ 593 bfd_size_type pc_count; 594}; 595 596/* s390 ELF linker hash entry. */ 597 598struct elf_s390_link_hash_entry 599{ 600 struct elf_link_hash_entry elf; 601 602 /* Track dynamic relocs copied for this symbol. */ 603 struct elf_s390_dyn_relocs *dyn_relocs; 604 605 /* Number of GOTPLT references for a function. */ 606 bfd_signed_vma gotplt_refcount; 607 608#define GOT_UNKNOWN 0 609#define GOT_NORMAL 1 610#define GOT_TLS_GD 2 611#define GOT_TLS_IE 3 612#define GOT_TLS_IE_NLT 3 613 unsigned char tls_type; 614}; 615 616#define elf_s390_hash_entry(ent) \ 617 ((struct elf_s390_link_hash_entry *)(ent)) 618 619struct elf_s390_obj_tdata 620{ 621 struct elf_obj_tdata root; 622 623 /* tls_type for each local got entry. */ 624 char *local_got_tls_type; 625}; 626 627#define elf_s390_tdata(abfd) \ 628 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 629 630#define elf_s390_local_got_tls_type(abfd) \ 631 (elf_s390_tdata (abfd)->local_got_tls_type) 632 633static bfd_boolean 634elf_s390_mkobject (abfd) 635 bfd *abfd; 636{ 637 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata); 638 abfd->tdata.any = bfd_zalloc (abfd, amt); 639 if (abfd->tdata.any == NULL) 640 return FALSE; 641 return TRUE; 642} 643 644static bfd_boolean 645elf_s390_object_p (abfd) 646 bfd *abfd; 647{ 648 /* Set the right machine number for an s390 elf32 file. */ 649 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); 650} 651 652/* s390 ELF linker hash table. */ 653 654struct elf_s390_link_hash_table 655{ 656 struct elf_link_hash_table elf; 657 658 /* Short-cuts to get to dynamic linker sections. */ 659 asection *sgot; 660 asection *sgotplt; 661 asection *srelgot; 662 asection *splt; 663 asection *srelplt; 664 asection *sdynbss; 665 asection *srelbss; 666 667 union { 668 bfd_signed_vma refcount; 669 bfd_vma offset; 670 } tls_ldm_got; 671 672 /* Small local sym to section mapping cache. */ 673 struct sym_sec_cache sym_sec; 674}; 675 676/* Get the s390 ELF linker hash table from a link_info structure. */ 677 678#define elf_s390_hash_table(p) \ 679 ((struct elf_s390_link_hash_table *) ((p)->hash)) 680 681/* Create an entry in an s390 ELF linker hash table. */ 682 683static struct bfd_hash_entry * 684link_hash_newfunc (entry, table, string) 685 struct bfd_hash_entry *entry; 686 struct bfd_hash_table *table; 687 const char *string; 688{ 689 /* Allocate the structure if it has not already been allocated by a 690 subclass. */ 691 if (entry == NULL) 692 { 693 entry = bfd_hash_allocate (table, 694 sizeof (struct elf_s390_link_hash_entry)); 695 if (entry == NULL) 696 return entry; 697 } 698 699 /* Call the allocation method of the superclass. */ 700 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 701 if (entry != NULL) 702 { 703 struct elf_s390_link_hash_entry *eh; 704 705 eh = (struct elf_s390_link_hash_entry *) entry; 706 eh->dyn_relocs = NULL; 707 eh->gotplt_refcount = 0; 708 eh->tls_type = GOT_UNKNOWN; 709 } 710 711 return entry; 712} 713 714/* Create an s390 ELF linker hash table. */ 715 716static struct bfd_link_hash_table * 717elf_s390_link_hash_table_create (abfd) 718 bfd *abfd; 719{ 720 struct elf_s390_link_hash_table *ret; 721 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 722 723 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt); 724 if (ret == NULL) 725 return NULL; 726 727 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 728 sizeof (struct elf_s390_link_hash_entry))) 729 { 730 free (ret); 731 return NULL; 732 } 733 734 ret->sgot = NULL; 735 ret->sgotplt = NULL; 736 ret->srelgot = NULL; 737 ret->splt = NULL; 738 ret->srelplt = NULL; 739 ret->sdynbss = NULL; 740 ret->srelbss = NULL; 741 ret->tls_ldm_got.refcount = 0; 742 ret->sym_sec.abfd = NULL; 743 744 return &ret->elf.root; 745} 746 747/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 748 shortcuts to them in our hash table. */ 749 750static bfd_boolean 751create_got_section (dynobj, info) 752 bfd *dynobj; 753 struct bfd_link_info *info; 754{ 755 struct elf_s390_link_hash_table *htab; 756 757 if (! _bfd_elf_create_got_section (dynobj, info)) 758 return FALSE; 759 760 htab = elf_s390_hash_table (info); 761 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 762 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 763 if (!htab->sgot || !htab->sgotplt) 764 abort (); 765 766 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", 767 (SEC_ALLOC | SEC_LOAD 768 | SEC_HAS_CONTENTS 769 | SEC_IN_MEMORY 770 | SEC_LINKER_CREATED 771 | SEC_READONLY)); 772 if (htab->srelgot == NULL 773 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) 774 return FALSE; 775 return TRUE; 776} 777 778/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 779 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 780 hash table. */ 781 782static bfd_boolean 783elf_s390_create_dynamic_sections (dynobj, info) 784 bfd *dynobj; 785 struct bfd_link_info *info; 786{ 787 struct elf_s390_link_hash_table *htab; 788 789 htab = elf_s390_hash_table (info); 790 if (!htab->sgot && !create_got_section (dynobj, info)) 791 return FALSE; 792 793 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 794 return FALSE; 795 796 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 797 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 798 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 799 if (!info->shared) 800 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 801 802 if (!htab->splt || !htab->srelplt || !htab->sdynbss 803 || (!info->shared && !htab->srelbss)) 804 abort (); 805 806 return TRUE; 807} 808 809/* Copy the extra info we tack onto an elf_link_hash_entry. */ 810 811static void 812elf_s390_copy_indirect_symbol (info, dir, ind) 813 struct bfd_link_info *info; 814 struct elf_link_hash_entry *dir, *ind; 815{ 816 struct elf_s390_link_hash_entry *edir, *eind; 817 818 edir = (struct elf_s390_link_hash_entry *) dir; 819 eind = (struct elf_s390_link_hash_entry *) ind; 820 821 if (eind->dyn_relocs != NULL) 822 { 823 if (edir->dyn_relocs != NULL) 824 { 825 struct elf_s390_dyn_relocs **pp; 826 struct elf_s390_dyn_relocs *p; 827 828 /* Add reloc counts against the indirect sym to the direct sym 829 list. Merge any entries against the same section. */ 830 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 831 { 832 struct elf_s390_dyn_relocs *q; 833 834 for (q = edir->dyn_relocs; q != NULL; q = q->next) 835 if (q->sec == p->sec) 836 { 837 q->pc_count += p->pc_count; 838 q->count += p->count; 839 *pp = p->next; 840 break; 841 } 842 if (q == NULL) 843 pp = &p->next; 844 } 845 *pp = edir->dyn_relocs; 846 } 847 848 edir->dyn_relocs = eind->dyn_relocs; 849 eind->dyn_relocs = NULL; 850 } 851 852 if (ind->root.type == bfd_link_hash_indirect 853 && dir->got.refcount <= 0) 854 { 855 edir->tls_type = eind->tls_type; 856 eind->tls_type = GOT_UNKNOWN; 857 } 858 859 if (ELIMINATE_COPY_RELOCS 860 && ind->root.type != bfd_link_hash_indirect 861 && dir->dynamic_adjusted) 862 { 863 /* If called to transfer flags for a weakdef during processing 864 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 865 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 866 dir->ref_dynamic |= ind->ref_dynamic; 867 dir->ref_regular |= ind->ref_regular; 868 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 869 dir->needs_plt |= ind->needs_plt; 870 } 871 else 872 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 873} 874 875static int 876elf_s390_tls_transition (info, r_type, is_local) 877 struct bfd_link_info *info; 878 int r_type; 879 int is_local; 880{ 881 if (info->shared) 882 return r_type; 883 884 switch (r_type) 885 { 886 case R_390_TLS_GD64: 887 case R_390_TLS_IE64: 888 if (is_local) 889 return R_390_TLS_LE64; 890 return R_390_TLS_IE64; 891 case R_390_TLS_GOTIE64: 892 if (is_local) 893 return R_390_TLS_LE64; 894 return R_390_TLS_GOTIE64; 895 case R_390_TLS_LDM64: 896 return R_390_TLS_LE64; 897 } 898 899 return r_type; 900} 901 902/* Look through the relocs for a section during the first phase, and 903 allocate space in the global offset table or procedure linkage 904 table. */ 905 906static bfd_boolean 907elf_s390_check_relocs (abfd, info, sec, relocs) 908 bfd *abfd; 909 struct bfd_link_info *info; 910 asection *sec; 911 const Elf_Internal_Rela *relocs; 912{ 913 struct elf_s390_link_hash_table *htab; 914 Elf_Internal_Shdr *symtab_hdr; 915 struct elf_link_hash_entry **sym_hashes; 916 const Elf_Internal_Rela *rel; 917 const Elf_Internal_Rela *rel_end; 918 asection *sreloc; 919 bfd_signed_vma *local_got_refcounts; 920 int tls_type, old_tls_type; 921 922 if (info->relocatable) 923 return TRUE; 924 925 htab = elf_s390_hash_table (info); 926 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 927 sym_hashes = elf_sym_hashes (abfd); 928 local_got_refcounts = elf_local_got_refcounts (abfd); 929 930 sreloc = NULL; 931 932 rel_end = relocs + sec->reloc_count; 933 for (rel = relocs; rel < rel_end; rel++) 934 { 935 unsigned int r_type; 936 unsigned long r_symndx; 937 struct elf_link_hash_entry *h; 938 939 r_symndx = ELF64_R_SYM (rel->r_info); 940 941 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 942 { 943 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 944 abfd, 945 r_symndx); 946 return FALSE; 947 } 948 949 if (r_symndx < symtab_hdr->sh_info) 950 h = NULL; 951 else 952 { 953 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 954 while (h->root.type == bfd_link_hash_indirect 955 || h->root.type == bfd_link_hash_warning) 956 h = (struct elf_link_hash_entry *) h->root.u.i.link; 957 } 958 959 /* Create got section and local_got_refcounts array if they 960 are needed. */ 961 r_type = elf_s390_tls_transition (info, 962 ELF64_R_TYPE (rel->r_info), 963 h == NULL); 964 switch (r_type) 965 { 966 case R_390_GOT12: 967 case R_390_GOT16: 968 case R_390_GOT20: 969 case R_390_GOT32: 970 case R_390_GOT64: 971 case R_390_GOTENT: 972 case R_390_GOTPLT12: 973 case R_390_GOTPLT16: 974 case R_390_GOTPLT20: 975 case R_390_GOTPLT32: 976 case R_390_GOTPLT64: 977 case R_390_GOTPLTENT: 978 case R_390_TLS_GD64: 979 case R_390_TLS_GOTIE12: 980 case R_390_TLS_GOTIE20: 981 case R_390_TLS_GOTIE64: 982 case R_390_TLS_IEENT: 983 case R_390_TLS_IE64: 984 case R_390_TLS_LDM64: 985 if (h == NULL 986 && local_got_refcounts == NULL) 987 { 988 bfd_size_type size; 989 990 size = symtab_hdr->sh_info; 991 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 992 local_got_refcounts = ((bfd_signed_vma *) 993 bfd_zalloc (abfd, size)); 994 if (local_got_refcounts == NULL) 995 return FALSE; 996 elf_local_got_refcounts (abfd) = local_got_refcounts; 997 elf_s390_local_got_tls_type (abfd) 998 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 999 } 1000 /* Fall through. */ 1001 case R_390_GOTOFF16: 1002 case R_390_GOTOFF32: 1003 case R_390_GOTOFF64: 1004 case R_390_GOTPC: 1005 case R_390_GOTPCDBL: 1006 if (htab->sgot == NULL) 1007 { 1008 if (htab->elf.dynobj == NULL) 1009 htab->elf.dynobj = abfd; 1010 if (!create_got_section (htab->elf.dynobj, info)) 1011 return FALSE; 1012 } 1013 } 1014 1015 switch (r_type) 1016 { 1017 case R_390_GOTOFF16: 1018 case R_390_GOTOFF32: 1019 case R_390_GOTOFF64: 1020 case R_390_GOTPC: 1021 case R_390_GOTPCDBL: 1022 /* Got is created, nothing to be done. */ 1023 break; 1024 1025 case R_390_PLT16DBL: 1026 case R_390_PLT32: 1027 case R_390_PLT32DBL: 1028 case R_390_PLT64: 1029 case R_390_PLTOFF16: 1030 case R_390_PLTOFF32: 1031 case R_390_PLTOFF64: 1032 /* This symbol requires a procedure linkage table entry. We 1033 actually build the entry in adjust_dynamic_symbol, 1034 because this might be a case of linking PIC code which is 1035 never referenced by a dynamic object, in which case we 1036 don't need to generate a procedure linkage table entry 1037 after all. */ 1038 1039 /* If this is a local symbol, we resolve it directly without 1040 creating a procedure linkage table entry. */ 1041 if (h != NULL) 1042 { 1043 h->needs_plt = 1; 1044 h->plt.refcount += 1; 1045 } 1046 break; 1047 1048 case R_390_GOTPLT12: 1049 case R_390_GOTPLT16: 1050 case R_390_GOTPLT20: 1051 case R_390_GOTPLT32: 1052 case R_390_GOTPLT64: 1053 case R_390_GOTPLTENT: 1054 /* This symbol requires either a procedure linkage table entry 1055 or an entry in the local got. We actually build the entry 1056 in adjust_dynamic_symbol because whether this is really a 1057 global reference can change and with it the fact if we have 1058 to create a plt entry or a local got entry. To be able to 1059 make a once global symbol a local one we have to keep track 1060 of the number of gotplt references that exist for this 1061 symbol. */ 1062 if (h != NULL) 1063 { 1064 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1065 h->needs_plt = 1; 1066 h->plt.refcount += 1; 1067 } 1068 else 1069 local_got_refcounts[r_symndx] += 1; 1070 break; 1071 1072 case R_390_TLS_LDM64: 1073 htab->tls_ldm_got.refcount += 1; 1074 break; 1075 1076 case R_390_TLS_IE64: 1077 case R_390_TLS_GOTIE12: 1078 case R_390_TLS_GOTIE20: 1079 case R_390_TLS_GOTIE64: 1080 case R_390_TLS_IEENT: 1081 if (info->shared) 1082 info->flags |= DF_STATIC_TLS; 1083 /* Fall through */ 1084 1085 case R_390_GOT12: 1086 case R_390_GOT16: 1087 case R_390_GOT20: 1088 case R_390_GOT32: 1089 case R_390_GOT64: 1090 case R_390_GOTENT: 1091 case R_390_TLS_GD64: 1092 /* This symbol requires a global offset table entry. */ 1093 switch (r_type) 1094 { 1095 default: 1096 case R_390_GOT12: 1097 case R_390_GOT16: 1098 case R_390_GOT20: 1099 case R_390_GOT32: 1100 case R_390_GOTENT: 1101 tls_type = GOT_NORMAL; 1102 break; 1103 case R_390_TLS_GD64: 1104 tls_type = GOT_TLS_GD; 1105 break; 1106 case R_390_TLS_IE64: 1107 case R_390_TLS_GOTIE64: 1108 tls_type = GOT_TLS_IE; 1109 break; 1110 case R_390_TLS_GOTIE12: 1111 case R_390_TLS_GOTIE20: 1112 case R_390_TLS_IEENT: 1113 tls_type = GOT_TLS_IE_NLT; 1114 break; 1115 } 1116 1117 if (h != NULL) 1118 { 1119 h->got.refcount += 1; 1120 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1121 } 1122 else 1123 { 1124 local_got_refcounts[r_symndx] += 1; 1125 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1126 } 1127 /* If a TLS symbol is accessed using IE at least once, 1128 there is no point to use dynamic model for it. */ 1129 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1130 { 1131 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1132 { 1133 (*_bfd_error_handler) 1134 (_("%B: `%s' accessed both as normal and thread local symbol"), 1135 abfd, h->root.root.string); 1136 return FALSE; 1137 } 1138 if (old_tls_type > tls_type) 1139 tls_type = old_tls_type; 1140 } 1141 1142 if (old_tls_type != tls_type) 1143 { 1144 if (h != NULL) 1145 elf_s390_hash_entry (h)->tls_type = tls_type; 1146 else 1147 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1148 } 1149 1150 if (r_type != R_390_TLS_IE64) 1151 break; 1152 /* Fall through */ 1153 1154 case R_390_TLS_LE64: 1155 if (!info->shared) 1156 break; 1157 info->flags |= DF_STATIC_TLS; 1158 /* Fall through */ 1159 1160 case R_390_8: 1161 case R_390_16: 1162 case R_390_32: 1163 case R_390_64: 1164 case R_390_PC16: 1165 case R_390_PC16DBL: 1166 case R_390_PC32: 1167 case R_390_PC32DBL: 1168 case R_390_PC64: 1169 if (h != NULL && !info->shared) 1170 { 1171 /* If this reloc is in a read-only section, we might 1172 need a copy reloc. We can't check reliably at this 1173 stage whether the section is read-only, as input 1174 sections have not yet been mapped to output sections. 1175 Tentatively set the flag for now, and correct in 1176 adjust_dynamic_symbol. */ 1177 h->non_got_ref = 1; 1178 1179 /* We may need a .plt entry if the function this reloc 1180 refers to is in a shared lib. */ 1181 h->plt.refcount += 1; 1182 } 1183 1184 /* If we are creating a shared library, and this is a reloc 1185 against a global symbol, or a non PC relative reloc 1186 against a local symbol, then we need to copy the reloc 1187 into the shared library. However, if we are linking with 1188 -Bsymbolic, we do not need to copy a reloc against a 1189 global symbol which is defined in an object we are 1190 including in the link (i.e., DEF_REGULAR is set). At 1191 this point we have not seen all the input files, so it is 1192 possible that DEF_REGULAR is not set now but will be set 1193 later (it is never cleared). In case of a weak definition, 1194 DEF_REGULAR may be cleared later by a strong definition in 1195 a shared library. We account for that possibility below by 1196 storing information in the relocs_copied field of the hash 1197 table entry. A similar situation occurs when creating 1198 shared libraries and symbol visibility changes render the 1199 symbol local. 1200 1201 If on the other hand, we are creating an executable, we 1202 may need to keep relocations for symbols satisfied by a 1203 dynamic library if we manage to avoid copy relocs for the 1204 symbol. */ 1205 if ((info->shared 1206 && (sec->flags & SEC_ALLOC) != 0 1207 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 1208 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL 1209 && ELF64_R_TYPE (rel->r_info) != R_390_PC32 1210 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL 1211 && ELF64_R_TYPE (rel->r_info) != R_390_PC64) 1212 || (h != NULL 1213 && (! info->symbolic 1214 || h->root.type == bfd_link_hash_defweak 1215 || !h->def_regular)))) 1216 || (ELIMINATE_COPY_RELOCS 1217 && !info->shared 1218 && (sec->flags & SEC_ALLOC) != 0 1219 && h != NULL 1220 && (h->root.type == bfd_link_hash_defweak 1221 || !h->def_regular))) 1222 { 1223 struct elf_s390_dyn_relocs *p; 1224 struct elf_s390_dyn_relocs **head; 1225 1226 /* We must copy these reloc types into the output file. 1227 Create a reloc section in dynobj and make room for 1228 this reloc. */ 1229 if (sreloc == NULL) 1230 { 1231 const char *name; 1232 bfd *dynobj; 1233 1234 name = (bfd_elf_string_from_elf_section 1235 (abfd, 1236 elf_elfheader (abfd)->e_shstrndx, 1237 elf_section_data (sec)->rel_hdr.sh_name)); 1238 if (name == NULL) 1239 return FALSE; 1240 1241 if (strncmp (name, ".rela", 5) != 0 1242 || strcmp (bfd_get_section_name (abfd, sec), 1243 name + 5) != 0) 1244 { 1245 (*_bfd_error_handler) 1246 (_("%B: bad relocation section name `%s\'"), 1247 abfd, name); 1248 } 1249 1250 if (htab->elf.dynobj == NULL) 1251 htab->elf.dynobj = abfd; 1252 1253 dynobj = htab->elf.dynobj; 1254 sreloc = bfd_get_section_by_name (dynobj, name); 1255 if (sreloc == NULL) 1256 { 1257 flagword flags; 1258 1259 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1260 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1261 if ((sec->flags & SEC_ALLOC) != 0) 1262 flags |= SEC_ALLOC | SEC_LOAD; 1263 sreloc = bfd_make_section_with_flags (dynobj, 1264 name, 1265 flags); 1266 if (sreloc == NULL 1267 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 1268 return FALSE; 1269 } 1270 elf_section_data (sec)->sreloc = sreloc; 1271 } 1272 1273 /* If this is a global symbol, we count the number of 1274 relocations we need for this symbol. */ 1275 if (h != NULL) 1276 { 1277 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1278 } 1279 else 1280 { 1281 /* Track dynamic relocs needed for local syms too. 1282 We really need local syms available to do this 1283 easily. Oh well. */ 1284 1285 asection *s; 1286 void *vpp; 1287 1288 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1289 sec, r_symndx); 1290 if (s == NULL) 1291 return FALSE; 1292 1293 vpp = &elf_section_data (s)->local_dynrel; 1294 head = (struct elf_s390_dyn_relocs **) vpp; 1295 } 1296 1297 p = *head; 1298 if (p == NULL || p->sec != sec) 1299 { 1300 bfd_size_type amt = sizeof *p; 1301 p = ((struct elf_s390_dyn_relocs *) 1302 bfd_alloc (htab->elf.dynobj, amt)); 1303 if (p == NULL) 1304 return FALSE; 1305 p->next = *head; 1306 *head = p; 1307 p->sec = sec; 1308 p->count = 0; 1309 p->pc_count = 0; 1310 } 1311 1312 p->count += 1; 1313 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 1314 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1315 || ELF64_R_TYPE (rel->r_info) == R_390_PC32 1316 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL 1317 || ELF64_R_TYPE (rel->r_info) == R_390_PC64) 1318 p->pc_count += 1; 1319 } 1320 break; 1321 1322 /* This relocation describes the C++ object vtable hierarchy. 1323 Reconstruct it for later use during GC. */ 1324 case R_390_GNU_VTINHERIT: 1325 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1326 return FALSE; 1327 break; 1328 1329 /* This relocation describes which C++ vtable entries are actually 1330 used. Record for later use during GC. */ 1331 case R_390_GNU_VTENTRY: 1332 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1333 return FALSE; 1334 break; 1335 1336 default: 1337 break; 1338 } 1339 } 1340 1341 return TRUE; 1342} 1343 1344/* Return the section that should be marked against GC for a given 1345 relocation. */ 1346 1347static asection * 1348elf_s390_gc_mark_hook (sec, info, rel, h, sym) 1349 asection *sec; 1350 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1351 Elf_Internal_Rela *rel; 1352 struct elf_link_hash_entry *h; 1353 Elf_Internal_Sym *sym; 1354{ 1355 if (h != NULL) 1356 { 1357 switch (ELF64_R_TYPE (rel->r_info)) 1358 { 1359 case R_390_GNU_VTINHERIT: 1360 case R_390_GNU_VTENTRY: 1361 break; 1362 1363 default: 1364 switch (h->root.type) 1365 { 1366 case bfd_link_hash_defined: 1367 case bfd_link_hash_defweak: 1368 return h->root.u.def.section; 1369 1370 case bfd_link_hash_common: 1371 return h->root.u.c.p->section; 1372 1373 default: 1374 break; 1375 } 1376 } 1377 } 1378 else 1379 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 1380 1381 return NULL; 1382} 1383 1384/* Update the got entry reference counts for the section being removed. */ 1385 1386static bfd_boolean 1387elf_s390_gc_sweep_hook (abfd, info, sec, relocs) 1388 bfd *abfd; 1389 struct bfd_link_info *info; 1390 asection *sec; 1391 const Elf_Internal_Rela *relocs; 1392{ 1393 Elf_Internal_Shdr *symtab_hdr; 1394 struct elf_link_hash_entry **sym_hashes; 1395 bfd_signed_vma *local_got_refcounts; 1396 const Elf_Internal_Rela *rel, *relend; 1397 1398 elf_section_data (sec)->local_dynrel = NULL; 1399 1400 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1401 sym_hashes = elf_sym_hashes (abfd); 1402 local_got_refcounts = elf_local_got_refcounts (abfd); 1403 1404 relend = relocs + sec->reloc_count; 1405 for (rel = relocs; rel < relend; rel++) 1406 { 1407 unsigned long r_symndx; 1408 unsigned int r_type; 1409 struct elf_link_hash_entry *h = NULL; 1410 1411 r_symndx = ELF64_R_SYM (rel->r_info); 1412 if (r_symndx >= symtab_hdr->sh_info) 1413 { 1414 struct elf_s390_link_hash_entry *eh; 1415 struct elf_s390_dyn_relocs **pp; 1416 struct elf_s390_dyn_relocs *p; 1417 1418 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1419 while (h->root.type == bfd_link_hash_indirect 1420 || h->root.type == bfd_link_hash_warning) 1421 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1422 eh = (struct elf_s390_link_hash_entry *) h; 1423 1424 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1425 if (p->sec == sec) 1426 { 1427 /* Everything must go for SEC. */ 1428 *pp = p->next; 1429 break; 1430 } 1431 } 1432 1433 r_type = ELF64_R_TYPE (rel->r_info); 1434 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1435 switch (r_type) 1436 { 1437 case R_390_TLS_LDM64: 1438 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1439 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1440 break; 1441 1442 case R_390_TLS_GD64: 1443 case R_390_TLS_IE64: 1444 case R_390_TLS_GOTIE12: 1445 case R_390_TLS_GOTIE20: 1446 case R_390_TLS_GOTIE64: 1447 case R_390_TLS_IEENT: 1448 case R_390_GOT12: 1449 case R_390_GOT16: 1450 case R_390_GOT20: 1451 case R_390_GOT32: 1452 case R_390_GOT64: 1453 case R_390_GOTOFF16: 1454 case R_390_GOTOFF32: 1455 case R_390_GOTOFF64: 1456 case R_390_GOTPC: 1457 case R_390_GOTPCDBL: 1458 case R_390_GOTENT: 1459 if (h != NULL) 1460 { 1461 if (h->got.refcount > 0) 1462 h->got.refcount -= 1; 1463 } 1464 else if (local_got_refcounts != NULL) 1465 { 1466 if (local_got_refcounts[r_symndx] > 0) 1467 local_got_refcounts[r_symndx] -= 1; 1468 } 1469 break; 1470 1471 case R_390_8: 1472 case R_390_12: 1473 case R_390_16: 1474 case R_390_20: 1475 case R_390_32: 1476 case R_390_64: 1477 case R_390_PC16: 1478 case R_390_PC16DBL: 1479 case R_390_PC32: 1480 case R_390_PC32DBL: 1481 case R_390_PC64: 1482 if (info->shared) 1483 break; 1484 /* Fall through */ 1485 1486 case R_390_PLT16DBL: 1487 case R_390_PLT32: 1488 case R_390_PLT32DBL: 1489 case R_390_PLT64: 1490 case R_390_PLTOFF16: 1491 case R_390_PLTOFF32: 1492 case R_390_PLTOFF64: 1493 if (h != NULL) 1494 { 1495 if (h->plt.refcount > 0) 1496 h->plt.refcount -= 1; 1497 } 1498 break; 1499 1500 case R_390_GOTPLT12: 1501 case R_390_GOTPLT16: 1502 case R_390_GOTPLT20: 1503 case R_390_GOTPLT32: 1504 case R_390_GOTPLT64: 1505 case R_390_GOTPLTENT: 1506 if (h != NULL) 1507 { 1508 if (h->plt.refcount > 0) 1509 { 1510 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1511 h->plt.refcount -= 1; 1512 } 1513 } 1514 else if (local_got_refcounts != NULL) 1515 { 1516 if (local_got_refcounts[r_symndx] > 0) 1517 local_got_refcounts[r_symndx] -= 1; 1518 } 1519 break; 1520 1521 default: 1522 break; 1523 } 1524 } 1525 1526 return TRUE; 1527} 1528 1529/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1530 entry but we found we will not create any. Called when we find we will 1531 not have any PLT for this symbol, by for example 1532 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1533 or elf_s390_size_dynamic_sections if no dynamic sections will be 1534 created (we're only linking static objects). */ 1535 1536static void 1537elf_s390_adjust_gotplt (h) 1538 struct elf_s390_link_hash_entry *h; 1539{ 1540 if (h->elf.root.type == bfd_link_hash_warning) 1541 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1542 1543 if (h->gotplt_refcount <= 0) 1544 return; 1545 1546 /* We simply add the number of gotplt references to the number 1547 * of got references for this symbol. */ 1548 h->elf.got.refcount += h->gotplt_refcount; 1549 h->gotplt_refcount = -1; 1550} 1551 1552/* Adjust a symbol defined by a dynamic object and referenced by a 1553 regular object. The current definition is in some section of the 1554 dynamic object, but we're not including those sections. We have to 1555 change the definition to something the rest of the link can 1556 understand. */ 1557 1558static bfd_boolean 1559elf_s390_adjust_dynamic_symbol (info, h) 1560 struct bfd_link_info *info; 1561 struct elf_link_hash_entry *h; 1562{ 1563 struct elf_s390_link_hash_table *htab; 1564 asection *s; 1565 unsigned int power_of_two; 1566 1567 /* If this is a function, put it in the procedure linkage table. We 1568 will fill in the contents of the procedure linkage table later 1569 (although we could actually do it here). */ 1570 if (h->type == STT_FUNC 1571 || h->needs_plt) 1572 { 1573 if (h->plt.refcount <= 0 1574 || (! info->shared 1575 && !h->def_dynamic 1576 && !h->ref_dynamic 1577 && h->root.type != bfd_link_hash_undefweak 1578 && h->root.type != bfd_link_hash_undefined)) 1579 { 1580 /* This case can occur if we saw a PLT32 reloc in an input 1581 file, but the symbol was never referred to by a dynamic 1582 object, or if all references were garbage collected. In 1583 such a case, we don't actually need to build a procedure 1584 linkage table, and we can just do a PC32 reloc instead. */ 1585 h->plt.offset = (bfd_vma) -1; 1586 h->needs_plt = 0; 1587 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1588 } 1589 1590 return TRUE; 1591 } 1592 else 1593 /* It's possible that we incorrectly decided a .plt reloc was 1594 needed for an R_390_PC32 reloc to a non-function sym in 1595 check_relocs. We can't decide accurately between function and 1596 non-function syms in check-relocs; Objects loaded later in 1597 the link may change h->type. So fix it now. */ 1598 h->plt.offset = (bfd_vma) -1; 1599 1600 /* If this is a weak symbol, and there is a real definition, the 1601 processor independent code will have arranged for us to see the 1602 real definition first, and we can just use the same value. */ 1603 if (h->u.weakdef != NULL) 1604 { 1605 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1606 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1607 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1608 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1609 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1610 h->non_got_ref = h->u.weakdef->non_got_ref; 1611 return TRUE; 1612 } 1613 1614 /* This is a reference to a symbol defined by a dynamic object which 1615 is not a function. */ 1616 1617 /* If we are creating a shared library, we must presume that the 1618 only references to the symbol are via the global offset table. 1619 For such cases we need not do anything here; the relocations will 1620 be handled correctly by relocate_section. */ 1621 if (info->shared) 1622 return TRUE; 1623 1624 /* If there are no references to this symbol that do not use the 1625 GOT, we don't need to generate a copy reloc. */ 1626 if (!h->non_got_ref) 1627 return TRUE; 1628 1629 /* If -z nocopyreloc was given, we won't generate them either. */ 1630 if (info->nocopyreloc) 1631 { 1632 h->non_got_ref = 0; 1633 return TRUE; 1634 } 1635 1636 if (ELIMINATE_COPY_RELOCS) 1637 { 1638 struct elf_s390_link_hash_entry * eh; 1639 struct elf_s390_dyn_relocs *p; 1640 1641 eh = (struct elf_s390_link_hash_entry *) h; 1642 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1643 { 1644 s = p->sec->output_section; 1645 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1646 break; 1647 } 1648 1649 /* If we didn't find any dynamic relocs in read-only sections, then 1650 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1651 if (p == NULL) 1652 { 1653 h->non_got_ref = 0; 1654 return TRUE; 1655 } 1656 } 1657 1658 if (h->size == 0) 1659 { 1660 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1661 h->root.root.string); 1662 return TRUE; 1663 } 1664 1665 /* We must allocate the symbol in our .dynbss section, which will 1666 become part of the .bss section of the executable. There will be 1667 an entry for this symbol in the .dynsym section. The dynamic 1668 object will contain position independent code, so all references 1669 from the dynamic object to this symbol will go through the global 1670 offset table. The dynamic linker will use the .dynsym entry to 1671 determine the address it must put in the global offset table, so 1672 both the dynamic object and the regular object will refer to the 1673 same memory location for the variable. */ 1674 1675 htab = elf_s390_hash_table (info); 1676 1677 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1678 copy the initial value out of the dynamic object and into the 1679 runtime process image. */ 1680 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1681 { 1682 htab->srelbss->size += sizeof (Elf64_External_Rela); 1683 h->needs_copy = 1; 1684 } 1685 1686 /* We need to figure out the alignment required for this symbol. I 1687 have no idea how ELF linkers handle this. */ 1688 power_of_two = bfd_log2 (h->size); 1689 if (power_of_two > 3) 1690 power_of_two = 3; 1691 1692 /* Apply the required alignment. */ 1693 s = htab->sdynbss; 1694 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 1695 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1696 { 1697 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1698 return FALSE; 1699 } 1700 1701 /* Define the symbol as being at this point in the section. */ 1702 h->root.u.def.section = s; 1703 h->root.u.def.value = s->size; 1704 1705 /* Increment the section size to make room for the symbol. */ 1706 s->size += h->size; 1707 1708 return TRUE; 1709} 1710 1711/* Allocate space in .plt, .got and associated reloc sections for 1712 dynamic relocs. */ 1713 1714static bfd_boolean 1715allocate_dynrelocs (h, inf) 1716 struct elf_link_hash_entry *h; 1717 PTR inf; 1718{ 1719 struct bfd_link_info *info; 1720 struct elf_s390_link_hash_table *htab; 1721 struct elf_s390_link_hash_entry *eh; 1722 struct elf_s390_dyn_relocs *p; 1723 1724 if (h->root.type == bfd_link_hash_indirect) 1725 return TRUE; 1726 1727 if (h->root.type == bfd_link_hash_warning) 1728 /* When warning symbols are created, they **replace** the "real" 1729 entry in the hash table, thus we never get to see the real 1730 symbol in a hash traversal. So look at it now. */ 1731 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1732 1733 info = (struct bfd_link_info *) inf; 1734 htab = elf_s390_hash_table (info); 1735 1736 if (htab->elf.dynamic_sections_created 1737 && h->plt.refcount > 0 1738 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1739 || h->root.type != bfd_link_hash_undefweak)) 1740 { 1741 /* Make sure this symbol is output as a dynamic symbol. 1742 Undefined weak syms won't yet be marked as dynamic. */ 1743 if (h->dynindx == -1 1744 && !h->forced_local) 1745 { 1746 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1747 return FALSE; 1748 } 1749 1750 if (info->shared 1751 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1752 { 1753 asection *s = htab->splt; 1754 1755 /* If this is the first .plt entry, make room for the special 1756 first entry. */ 1757 if (s->size == 0) 1758 s->size += PLT_FIRST_ENTRY_SIZE; 1759 1760 h->plt.offset = s->size; 1761 1762 /* If this symbol is not defined in a regular file, and we are 1763 not generating a shared library, then set the symbol to this 1764 location in the .plt. This is required to make function 1765 pointers compare as equal between the normal executable and 1766 the shared library. */ 1767 if (! info->shared 1768 && !h->def_regular) 1769 { 1770 h->root.u.def.section = s; 1771 h->root.u.def.value = h->plt.offset; 1772 } 1773 1774 /* Make room for this entry. */ 1775 s->size += PLT_ENTRY_SIZE; 1776 1777 /* We also need to make an entry in the .got.plt section, which 1778 will be placed in the .got section by the linker script. */ 1779 htab->sgotplt->size += GOT_ENTRY_SIZE; 1780 1781 /* We also need to make an entry in the .rela.plt section. */ 1782 htab->srelplt->size += sizeof (Elf64_External_Rela); 1783 } 1784 else 1785 { 1786 h->plt.offset = (bfd_vma) -1; 1787 h->needs_plt = 0; 1788 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1789 } 1790 } 1791 else 1792 { 1793 h->plt.offset = (bfd_vma) -1; 1794 h->needs_plt = 0; 1795 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1796 } 1797 1798 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to 1799 the binary, we can optimize a bit. IE64 and GOTIE64 get converted 1800 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT 1801 we can save the dynamic TLS relocation. */ 1802 if (h->got.refcount > 0 1803 && !info->shared 1804 && h->dynindx == -1 1805 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1806 { 1807 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1808 /* For the GOTIE access without a literal pool entry the offset has 1809 to be stored somewhere. The immediate value in the instruction 1810 is not bit enough so the value is stored in the got. */ 1811 { 1812 h->got.offset = htab->sgot->size; 1813 htab->sgot->size += GOT_ENTRY_SIZE; 1814 } 1815 else 1816 h->got.offset = (bfd_vma) -1; 1817 } 1818 else if (h->got.refcount > 0) 1819 { 1820 asection *s; 1821 bfd_boolean dyn; 1822 int tls_type = elf_s390_hash_entry(h)->tls_type; 1823 1824 /* Make sure this symbol is output as a dynamic symbol. 1825 Undefined weak syms won't yet be marked as dynamic. */ 1826 if (h->dynindx == -1 1827 && !h->forced_local) 1828 { 1829 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1830 return FALSE; 1831 } 1832 1833 s = htab->sgot; 1834 h->got.offset = s->size; 1835 s->size += GOT_ENTRY_SIZE; 1836 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */ 1837 if (tls_type == GOT_TLS_GD) 1838 s->size += GOT_ENTRY_SIZE; 1839 dyn = htab->elf.dynamic_sections_created; 1840 /* R_390_TLS_IE64 needs one dynamic relocation, 1841 R_390_TLS_GD64 needs one if local symbol and two if global. */ 1842 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1843 || tls_type >= GOT_TLS_IE) 1844 htab->srelgot->size += sizeof (Elf64_External_Rela); 1845 else if (tls_type == GOT_TLS_GD) 1846 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela); 1847 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1848 || h->root.type != bfd_link_hash_undefweak) 1849 && (info->shared 1850 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1851 htab->srelgot->size += sizeof (Elf64_External_Rela); 1852 } 1853 else 1854 h->got.offset = (bfd_vma) -1; 1855 1856 eh = (struct elf_s390_link_hash_entry *) h; 1857 if (eh->dyn_relocs == NULL) 1858 return TRUE; 1859 1860 /* In the shared -Bsymbolic case, discard space allocated for 1861 dynamic pc-relative relocs against symbols which turn out to be 1862 defined in regular objects. For the normal shared case, discard 1863 space for pc-relative relocs that have become local due to symbol 1864 visibility changes. */ 1865 1866 if (info->shared) 1867 { 1868 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1869 { 1870 struct elf_s390_dyn_relocs **pp; 1871 1872 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1873 { 1874 p->count -= p->pc_count; 1875 p->pc_count = 0; 1876 if (p->count == 0) 1877 *pp = p->next; 1878 else 1879 pp = &p->next; 1880 } 1881 } 1882 1883 /* Also discard relocs on undefined weak syms with non-default 1884 visibility. */ 1885 if (eh->dyn_relocs != NULL 1886 && h->root.type == bfd_link_hash_undefweak) 1887 { 1888 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1889 eh->dyn_relocs = NULL; 1890 1891 /* Make sure undefined weak symbols are output as a dynamic 1892 symbol in PIEs. */ 1893 else if (h->dynindx == -1 1894 && !h->forced_local) 1895 { 1896 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1897 return FALSE; 1898 } 1899 } 1900 } 1901 else if (ELIMINATE_COPY_RELOCS) 1902 { 1903 /* For the non-shared case, discard space for relocs against 1904 symbols which turn out to need copy relocs or are not 1905 dynamic. */ 1906 1907 if (!h->non_got_ref 1908 && ((h->def_dynamic 1909 && !h->def_regular) 1910 || (htab->elf.dynamic_sections_created 1911 && (h->root.type == bfd_link_hash_undefweak 1912 || h->root.type == bfd_link_hash_undefined)))) 1913 { 1914 /* Make sure this symbol is output as a dynamic symbol. 1915 Undefined weak syms won't yet be marked as dynamic. */ 1916 if (h->dynindx == -1 1917 && !h->forced_local) 1918 { 1919 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1920 return FALSE; 1921 } 1922 1923 /* If that succeeded, we know we'll be keeping all the 1924 relocs. */ 1925 if (h->dynindx != -1) 1926 goto keep; 1927 } 1928 1929 eh->dyn_relocs = NULL; 1930 1931 keep: ; 1932 } 1933 1934 /* Finally, allocate space. */ 1935 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1936 { 1937 asection *sreloc = elf_section_data (p->sec)->sreloc; 1938 sreloc->size += p->count * sizeof (Elf64_External_Rela); 1939 } 1940 1941 return TRUE; 1942} 1943 1944/* Find any dynamic relocs that apply to read-only sections. */ 1945 1946static bfd_boolean 1947readonly_dynrelocs (h, inf) 1948 struct elf_link_hash_entry *h; 1949 PTR inf; 1950{ 1951 struct elf_s390_link_hash_entry *eh; 1952 struct elf_s390_dyn_relocs *p; 1953 1954 if (h->root.type == bfd_link_hash_warning) 1955 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1956 1957 eh = (struct elf_s390_link_hash_entry *) h; 1958 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1959 { 1960 asection *s = p->sec->output_section; 1961 1962 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1963 { 1964 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1965 1966 info->flags |= DF_TEXTREL; 1967 1968 /* Not an error, just cut short the traversal. */ 1969 return FALSE; 1970 } 1971 } 1972 return TRUE; 1973} 1974 1975/* Set the sizes of the dynamic sections. */ 1976 1977static bfd_boolean 1978elf_s390_size_dynamic_sections (output_bfd, info) 1979 bfd *output_bfd ATTRIBUTE_UNUSED; 1980 struct bfd_link_info *info; 1981{ 1982 struct elf_s390_link_hash_table *htab; 1983 bfd *dynobj; 1984 asection *s; 1985 bfd_boolean relocs; 1986 bfd *ibfd; 1987 1988 htab = elf_s390_hash_table (info); 1989 dynobj = htab->elf.dynobj; 1990 if (dynobj == NULL) 1991 abort (); 1992 1993 if (htab->elf.dynamic_sections_created) 1994 { 1995 /* Set the contents of the .interp section to the interpreter. */ 1996 if (info->executable) 1997 { 1998 s = bfd_get_section_by_name (dynobj, ".interp"); 1999 if (s == NULL) 2000 abort (); 2001 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2002 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2003 } 2004 } 2005 2006 /* Set up .got offsets for local syms, and space for local dynamic 2007 relocs. */ 2008 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2009 { 2010 bfd_signed_vma *local_got; 2011 bfd_signed_vma *end_local_got; 2012 char *local_tls_type; 2013 bfd_size_type locsymcount; 2014 Elf_Internal_Shdr *symtab_hdr; 2015 asection *srela; 2016 2017 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 2018 continue; 2019 2020 for (s = ibfd->sections; s != NULL; s = s->next) 2021 { 2022 struct elf_s390_dyn_relocs *p; 2023 2024 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 2025 { 2026 if (!bfd_is_abs_section (p->sec) 2027 && bfd_is_abs_section (p->sec->output_section)) 2028 { 2029 /* Input section has been discarded, either because 2030 it is a copy of a linkonce section or due to 2031 linker script /DISCARD/, so we'll be discarding 2032 the relocs too. */ 2033 } 2034 else if (p->count != 0) 2035 { 2036 srela = elf_section_data (p->sec)->sreloc; 2037 srela->size += p->count * sizeof (Elf64_External_Rela); 2038 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2039 info->flags |= DF_TEXTREL; 2040 } 2041 } 2042 } 2043 2044 local_got = elf_local_got_refcounts (ibfd); 2045 if (!local_got) 2046 continue; 2047 2048 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2049 locsymcount = symtab_hdr->sh_info; 2050 end_local_got = local_got + locsymcount; 2051 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2052 s = htab->sgot; 2053 srela = htab->srelgot; 2054 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2055 { 2056 if (*local_got > 0) 2057 { 2058 *local_got = s->size; 2059 s->size += GOT_ENTRY_SIZE; 2060 if (*local_tls_type == GOT_TLS_GD) 2061 s->size += GOT_ENTRY_SIZE; 2062 if (info->shared) 2063 srela->size += sizeof (Elf64_External_Rela); 2064 } 2065 else 2066 *local_got = (bfd_vma) -1; 2067 } 2068 } 2069 2070 if (htab->tls_ldm_got.refcount > 0) 2071 { 2072 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64 2073 relocs. */ 2074 htab->tls_ldm_got.offset = htab->sgot->size; 2075 htab->sgot->size += 2 * GOT_ENTRY_SIZE; 2076 htab->srelgot->size += sizeof (Elf64_External_Rela); 2077 } 2078 else 2079 htab->tls_ldm_got.offset = -1; 2080 2081 /* Allocate global sym .plt and .got entries, and space for global 2082 sym dynamic relocs. */ 2083 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 2084 2085 /* We now have determined the sizes of the various dynamic sections. 2086 Allocate memory for them. */ 2087 relocs = FALSE; 2088 for (s = dynobj->sections; s != NULL; s = s->next) 2089 { 2090 if ((s->flags & SEC_LINKER_CREATED) == 0) 2091 continue; 2092 2093 if (s == htab->splt 2094 || s == htab->sgot 2095 || s == htab->sgotplt 2096 || s == htab->sdynbss) 2097 { 2098 /* Strip this section if we don't need it; see the 2099 comment below. */ 2100 } 2101 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) 2102 { 2103 if (s->size != 0 && s != htab->srelplt) 2104 relocs = TRUE; 2105 2106 /* We use the reloc_count field as a counter if we need 2107 to copy relocs into the output file. */ 2108 s->reloc_count = 0; 2109 } 2110 else 2111 { 2112 /* It's not one of our sections, so don't allocate space. */ 2113 continue; 2114 } 2115 2116 if (s->size == 0) 2117 { 2118 /* If we don't need this section, strip it from the 2119 output file. This is to handle .rela.bss and 2120 .rela.plt. We must create it in 2121 create_dynamic_sections, because it must be created 2122 before the linker maps input sections to output 2123 sections. The linker does that before 2124 adjust_dynamic_symbol is called, and it is that 2125 function which decides whether anything needs to go 2126 into these sections. */ 2127 2128 s->flags |= SEC_EXCLUDE; 2129 continue; 2130 } 2131 2132 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2133 continue; 2134 2135 /* Allocate memory for the section contents. We use bfd_zalloc 2136 here in case unused entries are not reclaimed before the 2137 section's contents are written out. This should not happen, 2138 but this way if it does, we get a R_390_NONE reloc instead 2139 of garbage. */ 2140 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2141 if (s->contents == NULL) 2142 return FALSE; 2143 } 2144 2145 if (htab->elf.dynamic_sections_created) 2146 { 2147 /* Add some entries to the .dynamic section. We fill in the 2148 values later, in elf_s390_finish_dynamic_sections, but we 2149 must add the entries now so that we get the correct size for 2150 the .dynamic section. The DT_DEBUG entry is filled in by the 2151 dynamic linker and used by the debugger. */ 2152#define add_dynamic_entry(TAG, VAL) \ 2153 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2154 2155 if (info->executable) 2156 { 2157 if (!add_dynamic_entry (DT_DEBUG, 0)) 2158 return FALSE; 2159 } 2160 2161 if (htab->splt->size != 0) 2162 { 2163 if (!add_dynamic_entry (DT_PLTGOT, 0) 2164 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2165 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2166 || !add_dynamic_entry (DT_JMPREL, 0)) 2167 return FALSE; 2168 } 2169 2170 if (relocs) 2171 { 2172 if (!add_dynamic_entry (DT_RELA, 0) 2173 || !add_dynamic_entry (DT_RELASZ, 0) 2174 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 2175 return FALSE; 2176 2177 /* If any dynamic relocs apply to a read-only section, 2178 then we need a DT_TEXTREL entry. */ 2179 if ((info->flags & DF_TEXTREL) == 0) 2180 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2181 (PTR) info); 2182 2183 if ((info->flags & DF_TEXTREL) != 0) 2184 { 2185 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2186 return FALSE; 2187 } 2188 } 2189 } 2190#undef add_dynamic_entry 2191 2192 return TRUE; 2193} 2194 2195/* Return the base VMA address which should be subtracted from real addresses 2196 when resolving @dtpoff relocation. 2197 This is PT_TLS segment p_vaddr. */ 2198 2199static bfd_vma 2200dtpoff_base (info) 2201 struct bfd_link_info *info; 2202{ 2203 /* If tls_sec is NULL, we should have signalled an error already. */ 2204 if (elf_hash_table (info)->tls_sec == NULL) 2205 return 0; 2206 return elf_hash_table (info)->tls_sec->vma; 2207} 2208 2209/* Return the relocation value for @tpoff relocation 2210 if STT_TLS virtual address is ADDRESS. */ 2211 2212static bfd_vma 2213tpoff (info, address) 2214 struct bfd_link_info *info; 2215 bfd_vma address; 2216{ 2217 struct elf_link_hash_table *htab = elf_hash_table (info); 2218 2219 /* If tls_sec is NULL, we should have signalled an error already. */ 2220 if (htab->tls_sec == NULL) 2221 return 0; 2222 return htab->tls_size + htab->tls_sec->vma - address; 2223} 2224 2225/* Complain if TLS instruction relocation is against an invalid 2226 instruction. */ 2227 2228static void 2229invalid_tls_insn (input_bfd, input_section, rel) 2230 bfd *input_bfd; 2231 asection *input_section; 2232 Elf_Internal_Rela *rel; 2233{ 2234 reloc_howto_type *howto; 2235 2236 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info); 2237 (*_bfd_error_handler) 2238 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"), 2239 input_bfd, 2240 input_section, 2241 (long) rel->r_offset, 2242 howto->name); 2243} 2244 2245/* Relocate a 390 ELF section. */ 2246 2247static bfd_boolean 2248elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, 2249 contents, relocs, local_syms, local_sections) 2250 bfd *output_bfd; 2251 struct bfd_link_info *info; 2252 bfd *input_bfd; 2253 asection *input_section; 2254 bfd_byte *contents; 2255 Elf_Internal_Rela *relocs; 2256 Elf_Internal_Sym *local_syms; 2257 asection **local_sections; 2258{ 2259 struct elf_s390_link_hash_table *htab; 2260 Elf_Internal_Shdr *symtab_hdr; 2261 struct elf_link_hash_entry **sym_hashes; 2262 bfd_vma *local_got_offsets; 2263 Elf_Internal_Rela *rel; 2264 Elf_Internal_Rela *relend; 2265 2266 if (info->relocatable) 2267 return TRUE; 2268 2269 htab = elf_s390_hash_table (info); 2270 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2271 sym_hashes = elf_sym_hashes (input_bfd); 2272 local_got_offsets = elf_local_got_offsets (input_bfd); 2273 2274 rel = relocs; 2275 relend = relocs + input_section->reloc_count; 2276 for (; rel < relend; rel++) 2277 { 2278 unsigned int r_type; 2279 reloc_howto_type *howto; 2280 unsigned long r_symndx; 2281 struct elf_link_hash_entry *h; 2282 Elf_Internal_Sym *sym; 2283 asection *sec; 2284 bfd_vma off; 2285 bfd_vma relocation; 2286 bfd_boolean unresolved_reloc; 2287 bfd_reloc_status_type r; 2288 int tls_type; 2289 2290 r_type = ELF64_R_TYPE (rel->r_info); 2291 if (r_type == (int) R_390_GNU_VTINHERIT 2292 || r_type == (int) R_390_GNU_VTENTRY) 2293 continue; 2294 if (r_type >= (int) R_390_max) 2295 { 2296 bfd_set_error (bfd_error_bad_value); 2297 return FALSE; 2298 } 2299 2300 howto = elf_howto_table + r_type; 2301 r_symndx = ELF64_R_SYM (rel->r_info); 2302 2303 /* This is a final link. */ 2304 h = NULL; 2305 sym = NULL; 2306 sec = NULL; 2307 unresolved_reloc = FALSE; 2308 if (r_symndx < symtab_hdr->sh_info) 2309 { 2310 sym = local_syms + r_symndx; 2311 sec = local_sections[r_symndx]; 2312 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2313 } 2314 else 2315 { 2316 bfd_boolean warned ATTRIBUTE_UNUSED; 2317 2318 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2319 r_symndx, symtab_hdr, sym_hashes, 2320 h, sec, relocation, 2321 unresolved_reloc, warned); 2322 } 2323 2324 switch (r_type) 2325 { 2326 case R_390_GOTPLT12: 2327 case R_390_GOTPLT16: 2328 case R_390_GOTPLT20: 2329 case R_390_GOTPLT32: 2330 case R_390_GOTPLT64: 2331 case R_390_GOTPLTENT: 2332 /* There are three cases for a GOTPLT relocation. 1) The 2333 relocation is against the jump slot entry of a plt that 2334 will get emitted to the output file. 2) The relocation 2335 is against the jump slot of a plt entry that has been 2336 removed. elf_s390_adjust_gotplt has created a GOT entry 2337 as replacement. 3) The relocation is against a local symbol. 2338 Cases 2) and 3) are the same as the GOT relocation code 2339 so we just have to test for case 1 and fall through for 2340 the other two. */ 2341 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2342 { 2343 bfd_vma plt_index; 2344 2345 /* Calc. index no. 2346 Current offset - size first entry / entry size. */ 2347 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2348 PLT_ENTRY_SIZE; 2349 2350 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 2351 addr & GOT addr. */ 2352 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2353 unresolved_reloc = FALSE; 2354 2355 if (r_type == R_390_GOTPLTENT) 2356 relocation += htab->sgot->output_section->vma; 2357 break; 2358 } 2359 /* Fall through. */ 2360 2361 case R_390_GOT12: 2362 case R_390_GOT16: 2363 case R_390_GOT20: 2364 case R_390_GOT32: 2365 case R_390_GOT64: 2366 case R_390_GOTENT: 2367 /* Relocation is to the entry for this symbol in the global 2368 offset table. */ 2369 if (htab->sgot == NULL) 2370 abort (); 2371 2372 if (h != NULL) 2373 { 2374 bfd_boolean dyn; 2375 2376 off = h->got.offset; 2377 dyn = htab->elf.dynamic_sections_created; 2378 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2379 || (info->shared 2380 && (info->symbolic 2381 || h->dynindx == -1 2382 || h->forced_local) 2383 && h->def_regular) 2384 || (ELF_ST_VISIBILITY (h->other) 2385 && h->root.type == bfd_link_hash_undefweak)) 2386 { 2387 /* This is actually a static link, or it is a 2388 -Bsymbolic link and the symbol is defined 2389 locally, or the symbol was forced to be local 2390 because of a version file. We must initialize 2391 this entry in the global offset table. Since the 2392 offset must always be a multiple of 2, we use the 2393 least significant bit to record whether we have 2394 initialized it already. 2395 2396 When doing a dynamic link, we create a .rel.got 2397 relocation entry to initialize the value. This 2398 is done in the finish_dynamic_symbol routine. */ 2399 if ((off & 1) != 0) 2400 off &= ~1; 2401 else 2402 { 2403 bfd_put_64 (output_bfd, relocation, 2404 htab->sgot->contents + off); 2405 h->got.offset |= 1; 2406 } 2407 } 2408 else 2409 unresolved_reloc = FALSE; 2410 } 2411 else 2412 { 2413 if (local_got_offsets == NULL) 2414 abort (); 2415 2416 off = local_got_offsets[r_symndx]; 2417 2418 /* The offset must always be a multiple of 8. We use 2419 the least significant bit to record whether we have 2420 already generated the necessary reloc. */ 2421 if ((off & 1) != 0) 2422 off &= ~1; 2423 else 2424 { 2425 bfd_put_64 (output_bfd, relocation, 2426 htab->sgot->contents + off); 2427 2428 if (info->shared) 2429 { 2430 asection *s; 2431 Elf_Internal_Rela outrel; 2432 bfd_byte *loc; 2433 2434 s = htab->srelgot; 2435 if (s == NULL) 2436 abort (); 2437 2438 outrel.r_offset = (htab->sgot->output_section->vma 2439 + htab->sgot->output_offset 2440 + off); 2441 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2442 outrel.r_addend = relocation; 2443 loc = s->contents; 2444 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2445 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2446 } 2447 2448 local_got_offsets[r_symndx] |= 1; 2449 } 2450 } 2451 2452 if (off >= (bfd_vma) -2) 2453 abort (); 2454 2455 relocation = htab->sgot->output_offset + off; 2456 2457 /* For @GOTENT the relocation is against the offset between 2458 the instruction and the symbols entry in the GOT and not 2459 between the start of the GOT and the symbols entry. We 2460 add the vma of the GOT to get the correct value. */ 2461 if ( r_type == R_390_GOTENT 2462 || r_type == R_390_GOTPLTENT) 2463 relocation += htab->sgot->output_section->vma; 2464 2465 break; 2466 2467 case R_390_GOTOFF16: 2468 case R_390_GOTOFF32: 2469 case R_390_GOTOFF64: 2470 /* Relocation is relative to the start of the global offset 2471 table. */ 2472 2473 /* Note that sgot->output_offset is not involved in this 2474 calculation. We always want the start of .got. If we 2475 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2476 permitted by the ABI, we might have to change this 2477 calculation. */ 2478 relocation -= htab->sgot->output_section->vma; 2479 break; 2480 2481 case R_390_GOTPC: 2482 case R_390_GOTPCDBL: 2483 /* Use global offset table as symbol value. */ 2484 relocation = htab->sgot->output_section->vma; 2485 unresolved_reloc = FALSE; 2486 break; 2487 2488 case R_390_PLT16DBL: 2489 case R_390_PLT32: 2490 case R_390_PLT32DBL: 2491 case R_390_PLT64: 2492 /* Relocation is to the entry for this symbol in the 2493 procedure linkage table. */ 2494 2495 /* Resolve a PLT32 reloc against a local symbol directly, 2496 without using the procedure linkage table. */ 2497 if (h == NULL) 2498 break; 2499 2500 if (h->plt.offset == (bfd_vma) -1 2501 || htab->splt == NULL) 2502 { 2503 /* We didn't make a PLT entry for this symbol. This 2504 happens when statically linking PIC code, or when 2505 using -Bsymbolic. */ 2506 break; 2507 } 2508 2509 relocation = (htab->splt->output_section->vma 2510 + htab->splt->output_offset 2511 + h->plt.offset); 2512 unresolved_reloc = FALSE; 2513 break; 2514 2515 case R_390_PLTOFF16: 2516 case R_390_PLTOFF32: 2517 case R_390_PLTOFF64: 2518 /* Relocation is to the entry for this symbol in the 2519 procedure linkage table relative to the start of the GOT. */ 2520 2521 /* For local symbols or if we didn't make a PLT entry for 2522 this symbol resolve the symbol directly. */ 2523 if ( h == NULL 2524 || h->plt.offset == (bfd_vma) -1 2525 || htab->splt == NULL) 2526 { 2527 relocation -= htab->sgot->output_section->vma; 2528 break; 2529 } 2530 2531 relocation = (htab->splt->output_section->vma 2532 + htab->splt->output_offset 2533 + h->plt.offset 2534 - htab->sgot->output_section->vma); 2535 unresolved_reloc = FALSE; 2536 break; 2537 2538 case R_390_8: 2539 case R_390_16: 2540 case R_390_32: 2541 case R_390_64: 2542 case R_390_PC16: 2543 case R_390_PC16DBL: 2544 case R_390_PC32: 2545 case R_390_PC32DBL: 2546 case R_390_PC64: 2547 /* r_symndx will be zero only for relocs against symbols 2548 from removed linkonce sections, or sections discarded by 2549 a linker script. */ 2550 if (r_symndx == 0 2551 || (input_section->flags & SEC_ALLOC) == 0) 2552 break; 2553 2554 if ((info->shared 2555 && (h == NULL 2556 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2557 || h->root.type != bfd_link_hash_undefweak) 2558 && ((r_type != R_390_PC16 2559 && r_type != R_390_PC16DBL 2560 && r_type != R_390_PC32 2561 && r_type != R_390_PC32DBL 2562 && r_type != R_390_PC64) 2563 || (h != NULL 2564 && !SYMBOL_REFERENCES_LOCAL (info, h)))) 2565 || (ELIMINATE_COPY_RELOCS 2566 && !info->shared 2567 && h != NULL 2568 && h->dynindx != -1 2569 && !h->non_got_ref 2570 && ((h->def_dynamic 2571 && !h->def_regular) 2572 || h->root.type == bfd_link_hash_undefweak 2573 || h->root.type == bfd_link_hash_undefined))) 2574 { 2575 Elf_Internal_Rela outrel; 2576 bfd_boolean skip, relocate; 2577 asection *sreloc; 2578 bfd_byte *loc; 2579 2580 /* When generating a shared object, these relocations 2581 are copied into the output file to be resolved at run 2582 time. */ 2583 skip = FALSE; 2584 relocate = FALSE; 2585 2586 outrel.r_offset = 2587 _bfd_elf_section_offset (output_bfd, info, input_section, 2588 rel->r_offset); 2589 if (outrel.r_offset == (bfd_vma) -1) 2590 skip = TRUE; 2591 else if (outrel.r_offset == (bfd_vma) -2) 2592 skip = TRUE, relocate = TRUE; 2593 2594 outrel.r_offset += (input_section->output_section->vma 2595 + input_section->output_offset); 2596 2597 if (skip) 2598 memset (&outrel, 0, sizeof outrel); 2599 else if (h != NULL 2600 && h->dynindx != -1 2601 && (r_type == R_390_PC16 2602 || r_type == R_390_PC16DBL 2603 || r_type == R_390_PC32 2604 || r_type == R_390_PC32DBL 2605 || r_type == R_390_PC64 2606 || !info->shared 2607 || !info->symbolic 2608 || !h->def_regular)) 2609 { 2610 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2611 outrel.r_addend = rel->r_addend; 2612 } 2613 else 2614 { 2615 /* This symbol is local, or marked to become local. */ 2616 outrel.r_addend = relocation + rel->r_addend; 2617 if (r_type == R_390_64) 2618 { 2619 relocate = TRUE; 2620 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2621 } 2622 else 2623 { 2624 long sindx; 2625 2626 if (bfd_is_abs_section (sec)) 2627 sindx = 0; 2628 else if (sec == NULL || sec->owner == NULL) 2629 { 2630 bfd_set_error(bfd_error_bad_value); 2631 return FALSE; 2632 } 2633 else 2634 { 2635 asection *osec; 2636 2637 osec = sec->output_section; 2638 sindx = elf_section_data (osec)->dynindx; 2639 BFD_ASSERT (sindx > 0); 2640 2641 /* We are turning this relocation into one 2642 against a section symbol, so subtract out 2643 the output section's address but not the 2644 offset of the input section in the output 2645 section. */ 2646 2647 outrel.r_addend -= osec->vma; 2648 } 2649 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2650 } 2651 } 2652 2653 sreloc = elf_section_data (input_section)->sreloc; 2654 if (sreloc == NULL) 2655 abort (); 2656 2657 loc = sreloc->contents; 2658 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2659 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2660 2661 /* If this reloc is against an external symbol, we do 2662 not want to fiddle with the addend. Otherwise, we 2663 need to include the symbol value so that it becomes 2664 an addend for the dynamic reloc. */ 2665 if (! relocate) 2666 continue; 2667 } 2668 2669 break; 2670 2671 /* Relocations for tls literal pool entries. */ 2672 case R_390_TLS_IE64: 2673 if (info->shared) 2674 { 2675 Elf_Internal_Rela outrel; 2676 asection *sreloc; 2677 bfd_byte *loc; 2678 2679 outrel.r_offset = rel->r_offset 2680 + input_section->output_section->vma 2681 + input_section->output_offset; 2682 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2683 sreloc = elf_section_data (input_section)->sreloc; 2684 if (sreloc == NULL) 2685 abort (); 2686 loc = sreloc->contents; 2687 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2688 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc); 2689 } 2690 /* Fall through. */ 2691 2692 case R_390_TLS_GD64: 2693 case R_390_TLS_GOTIE64: 2694 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2695 tls_type = GOT_UNKNOWN; 2696 if (h == NULL && local_got_offsets) 2697 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2698 else if (h != NULL) 2699 { 2700 tls_type = elf_s390_hash_entry(h)->tls_type; 2701 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2702 r_type = R_390_TLS_LE64; 2703 } 2704 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE) 2705 r_type = R_390_TLS_IE64; 2706 2707 if (r_type == R_390_TLS_LE64) 2708 { 2709 /* This relocation gets optimized away by the local exec 2710 access optimization. */ 2711 BFD_ASSERT (! unresolved_reloc); 2712 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2713 contents + rel->r_offset); 2714 continue; 2715 } 2716 2717 if (htab->sgot == NULL) 2718 abort (); 2719 2720 if (h != NULL) 2721 off = h->got.offset; 2722 else 2723 { 2724 if (local_got_offsets == NULL) 2725 abort (); 2726 2727 off = local_got_offsets[r_symndx]; 2728 } 2729 2730 emit_tls_relocs: 2731 2732 if ((off & 1) != 0) 2733 off &= ~1; 2734 else 2735 { 2736 Elf_Internal_Rela outrel; 2737 bfd_byte *loc; 2738 int dr_type, indx; 2739 2740 if (htab->srelgot == NULL) 2741 abort (); 2742 2743 outrel.r_offset = (htab->sgot->output_section->vma 2744 + htab->sgot->output_offset + off); 2745 2746 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2747 if (r_type == R_390_TLS_GD64) 2748 dr_type = R_390_TLS_DTPMOD; 2749 else 2750 dr_type = R_390_TLS_TPOFF; 2751 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2752 outrel.r_addend = relocation - dtpoff_base (info); 2753 else 2754 outrel.r_addend = 0; 2755 outrel.r_info = ELF64_R_INFO (indx, dr_type); 2756 loc = htab->srelgot->contents; 2757 loc += htab->srelgot->reloc_count++ 2758 * sizeof (Elf64_External_Rela); 2759 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2760 2761 if (r_type == R_390_TLS_GD64) 2762 { 2763 if (indx == 0) 2764 { 2765 BFD_ASSERT (! unresolved_reloc); 2766 bfd_put_64 (output_bfd, 2767 relocation - dtpoff_base (info), 2768 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2769 } 2770 else 2771 { 2772 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF); 2773 outrel.r_offset += GOT_ENTRY_SIZE; 2774 outrel.r_addend = 0; 2775 htab->srelgot->reloc_count++; 2776 loc += sizeof (Elf64_External_Rela); 2777 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2778 } 2779 } 2780 2781 if (h != NULL) 2782 h->got.offset |= 1; 2783 else 2784 local_got_offsets[r_symndx] |= 1; 2785 } 2786 2787 if (off >= (bfd_vma) -2) 2788 abort (); 2789 if (r_type == ELF64_R_TYPE (rel->r_info)) 2790 { 2791 relocation = htab->sgot->output_offset + off; 2792 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT) 2793 relocation += htab->sgot->output_section->vma; 2794 unresolved_reloc = FALSE; 2795 } 2796 else 2797 { 2798 bfd_put_64 (output_bfd, htab->sgot->output_offset + off, 2799 contents + rel->r_offset); 2800 continue; 2801 } 2802 break; 2803 2804 case R_390_TLS_GOTIE12: 2805 case R_390_TLS_GOTIE20: 2806 case R_390_TLS_IEENT: 2807 if (h == NULL) 2808 { 2809 if (local_got_offsets == NULL) 2810 abort(); 2811 off = local_got_offsets[r_symndx]; 2812 if (info->shared) 2813 goto emit_tls_relocs; 2814 } 2815 else 2816 { 2817 off = h->got.offset; 2818 tls_type = elf_s390_hash_entry(h)->tls_type; 2819 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 2820 goto emit_tls_relocs; 2821 } 2822 2823 if (htab->sgot == NULL) 2824 abort (); 2825 2826 BFD_ASSERT (! unresolved_reloc); 2827 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2828 htab->sgot->contents + off); 2829 relocation = htab->sgot->output_offset + off; 2830 if (r_type == R_390_TLS_IEENT) 2831 relocation += htab->sgot->output_section->vma; 2832 unresolved_reloc = FALSE; 2833 break; 2834 2835 case R_390_TLS_LDM64: 2836 if (! info->shared) 2837 /* The literal pool entry this relocation refers to gets ignored 2838 by the optimized code of the local exec model. Do nothing 2839 and the value will turn out zero. */ 2840 continue; 2841 2842 if (htab->sgot == NULL) 2843 abort (); 2844 2845 off = htab->tls_ldm_got.offset; 2846 if (off & 1) 2847 off &= ~1; 2848 else 2849 { 2850 Elf_Internal_Rela outrel; 2851 bfd_byte *loc; 2852 2853 if (htab->srelgot == NULL) 2854 abort (); 2855 2856 outrel.r_offset = (htab->sgot->output_section->vma 2857 + htab->sgot->output_offset + off); 2858 2859 bfd_put_64 (output_bfd, 0, 2860 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2861 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD); 2862 outrel.r_addend = 0; 2863 loc = htab->srelgot->contents; 2864 loc += htab->srelgot->reloc_count++ 2865 * sizeof (Elf64_External_Rela); 2866 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2867 htab->tls_ldm_got.offset |= 1; 2868 } 2869 relocation = htab->sgot->output_offset + off; 2870 unresolved_reloc = FALSE; 2871 break; 2872 2873 case R_390_TLS_LE64: 2874 if (info->shared) 2875 { 2876 /* Linking a shared library with non-fpic code requires 2877 a R_390_TLS_TPOFF relocation. */ 2878 Elf_Internal_Rela outrel; 2879 asection *sreloc; 2880 bfd_byte *loc; 2881 int indx; 2882 2883 outrel.r_offset = rel->r_offset 2884 + input_section->output_section->vma 2885 + input_section->output_offset; 2886 if (h != NULL && h->dynindx != -1) 2887 indx = h->dynindx; 2888 else 2889 indx = 0; 2890 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF); 2891 if (indx == 0) 2892 outrel.r_addend = relocation - dtpoff_base (info); 2893 else 2894 outrel.r_addend = 0; 2895 sreloc = elf_section_data (input_section)->sreloc; 2896 if (sreloc == NULL) 2897 abort (); 2898 loc = sreloc->contents; 2899 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2900 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2901 } 2902 else 2903 { 2904 BFD_ASSERT (! unresolved_reloc); 2905 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2906 contents + rel->r_offset); 2907 } 2908 continue; 2909 2910 case R_390_TLS_LDO64: 2911 if (info->shared || (input_section->flags & SEC_CODE) == 0) 2912 relocation -= dtpoff_base (info); 2913 else 2914 /* When converting LDO to LE, we must negate. */ 2915 relocation = -tpoff (info, relocation); 2916 break; 2917 2918 /* Relocations for tls instructions. */ 2919 case R_390_TLS_LOAD: 2920 case R_390_TLS_GDCALL: 2921 case R_390_TLS_LDCALL: 2922 tls_type = GOT_UNKNOWN; 2923 if (h == NULL && local_got_offsets) 2924 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2925 else if (h != NULL) 2926 tls_type = elf_s390_hash_entry(h)->tls_type; 2927 2928 if (tls_type == GOT_TLS_GD) 2929 continue; 2930 2931 if (r_type == R_390_TLS_LOAD) 2932 { 2933 if (!info->shared && (h == NULL || h->dynindx == -1)) 2934 { 2935 /* IE->LE transition. Four valid cases: 2936 lg %rx,(0,%ry) -> sllg %rx,%ry,0 2937 lg %rx,(%ry,0) -> sllg %rx,%ry,0 2938 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 2939 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */ 2940 unsigned int insn0, insn1, ry; 2941 2942 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2943 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2944 if (insn1 != 0x0004) 2945 invalid_tls_insn (input_bfd, input_section, rel); 2946 ry = 0; 2947 if ((insn0 & 0xff00f000) == 0xe3000000) 2948 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */ 2949 ry = (insn0 & 0x000f0000); 2950 else if ((insn0 & 0xff0f0000) == 0xe3000000) 2951 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */ 2952 ry = (insn0 & 0x0000f000) << 4; 2953 else if ((insn0 & 0xff00f000) == 0xe300c000) 2954 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */ 2955 ry = (insn0 & 0x000f0000); 2956 else if ((insn0 & 0xff0f0000) == 0xe30c0000) 2957 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */ 2958 ry = (insn0 & 0x0000f000) << 4; 2959 else 2960 invalid_tls_insn (input_bfd, input_section, rel); 2961 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry; 2962 insn1 = 0x000d; 2963 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2964 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2965 } 2966 } 2967 else if (r_type == R_390_TLS_GDCALL) 2968 { 2969 unsigned int insn0, insn1; 2970 2971 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2972 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2973 if ((insn0 & 0xffff0000) != 0xc0e50000) 2974 invalid_tls_insn (input_bfd, input_section, rel); 2975 if (!info->shared && (h == NULL || h->dynindx == -1)) 2976 { 2977 /* GD->LE transition. 2978 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2979 insn0 = 0xc0040000; 2980 insn1 = 0x0000; 2981 } 2982 else 2983 { 2984 /* GD->IE transition. 2985 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */ 2986 insn0 = 0xe322c000; 2987 insn1 = 0x0004; 2988 } 2989 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2990 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2991 } 2992 else if (r_type == R_390_TLS_LDCALL) 2993 { 2994 if (!info->shared) 2995 { 2996 unsigned int insn0, insn1; 2997 2998 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2999 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3000 if ((insn0 & 0xffff0000) != 0xc0e50000) 3001 invalid_tls_insn (input_bfd, input_section, rel); 3002 /* LD->LE transition. 3003 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 3004 insn0 = 0xc0040000; 3005 insn1 = 0x0000; 3006 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3007 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3008 } 3009 } 3010 continue; 3011 3012 default: 3013 break; 3014 } 3015 3016 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3017 because such sections are not SEC_ALLOC and thus ld.so will 3018 not process them. */ 3019 if (unresolved_reloc 3020 && !((input_section->flags & SEC_DEBUGGING) != 0 3021 && h->def_dynamic)) 3022 (*_bfd_error_handler) 3023 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3024 input_bfd, 3025 input_section, 3026 (long) rel->r_offset, 3027 howto->name, 3028 h->root.root.string); 3029 3030 if (r_type == R_390_20 3031 || r_type == R_390_GOT20 3032 || r_type == R_390_GOTPLT20 3033 || r_type == R_390_TLS_GOTIE20) 3034 { 3035 relocation += rel->r_addend; 3036 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3037 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3038 contents, rel->r_offset, 3039 relocation, 0); 3040 } 3041 else 3042 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3043 contents, rel->r_offset, 3044 relocation, rel->r_addend); 3045 3046 if (r != bfd_reloc_ok) 3047 { 3048 const char *name; 3049 3050 if (h != NULL) 3051 name = h->root.root.string; 3052 else 3053 { 3054 name = bfd_elf_string_from_elf_section (input_bfd, 3055 symtab_hdr->sh_link, 3056 sym->st_name); 3057 if (name == NULL) 3058 return FALSE; 3059 if (*name == '\0') 3060 name = bfd_section_name (input_bfd, sec); 3061 } 3062 3063 if (r == bfd_reloc_overflow) 3064 { 3065 3066 if (! ((*info->callbacks->reloc_overflow) 3067 (info, (h ? &h->root : NULL), name, howto->name, 3068 (bfd_vma) 0, input_bfd, input_section, 3069 rel->r_offset))) 3070 return FALSE; 3071 } 3072 else 3073 { 3074 (*_bfd_error_handler) 3075 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3076 input_bfd, input_section, 3077 (long) rel->r_offset, name, (int) r); 3078 return FALSE; 3079 } 3080 } 3081 } 3082 3083 return TRUE; 3084} 3085 3086/* Finish up dynamic symbol handling. We set the contents of various 3087 dynamic sections here. */ 3088 3089static bfd_boolean 3090elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) 3091 bfd *output_bfd; 3092 struct bfd_link_info *info; 3093 struct elf_link_hash_entry *h; 3094 Elf_Internal_Sym *sym; 3095{ 3096 struct elf_s390_link_hash_table *htab; 3097 3098 htab = elf_s390_hash_table (info); 3099 3100 if (h->plt.offset != (bfd_vma) -1) 3101 { 3102 bfd_vma plt_index; 3103 bfd_vma got_offset; 3104 Elf_Internal_Rela rela; 3105 bfd_byte *loc; 3106 3107 /* This symbol has an entry in the procedure linkage table. Set 3108 it up. */ 3109 3110 if (h->dynindx == -1 3111 || htab->splt == NULL 3112 || htab->sgotplt == NULL 3113 || htab->srelplt == NULL) 3114 abort (); 3115 3116 /* Calc. index no. 3117 Current offset - size first entry / entry size. */ 3118 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3119 3120 /* Offset in GOT is PLT index plus GOT headers(3) times 8, 3121 addr & GOT addr. */ 3122 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3123 3124 /* Fill in the blueprint of a PLT. */ 3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0, 3126 htab->splt->contents + h->plt.offset); 3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, 3128 htab->splt->contents + h->plt.offset + 4); 3129 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, 3130 htab->splt->contents + h->plt.offset + 8); 3131 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, 3132 htab->splt->contents + h->plt.offset + 12); 3133 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, 3134 htab->splt->contents + h->plt.offset + 16); 3135 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5, 3136 htab->splt->contents + h->plt.offset + 20); 3137 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6, 3138 htab->splt->contents + h->plt.offset + 24); 3139 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7, 3140 htab->splt->contents + h->plt.offset + 28); 3141 /* Fixup the relative address to the GOT entry */ 3142 bfd_put_32 (output_bfd, 3143 (htab->sgotplt->output_section->vma + 3144 htab->sgotplt->output_offset + got_offset 3145 - (htab->splt->output_section->vma + h->plt.offset))/2, 3146 htab->splt->contents + h->plt.offset + 2); 3147 /* Fixup the relative branch to PLT 0 */ 3148 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + 3149 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3150 htab->splt->contents + h->plt.offset + 24); 3151 /* Fixup offset into symbol table */ 3152 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), 3153 htab->splt->contents + h->plt.offset + 28); 3154 3155 /* Fill in the entry in the global offset table. 3156 Points to instruction after GOT offset. */ 3157 bfd_put_64 (output_bfd, 3158 (htab->splt->output_section->vma 3159 + htab->splt->output_offset 3160 + h->plt.offset 3161 + 14), 3162 htab->sgotplt->contents + got_offset); 3163 3164 /* Fill in the entry in the .rela.plt section. */ 3165 rela.r_offset = (htab->sgotplt->output_section->vma 3166 + htab->sgotplt->output_offset 3167 + got_offset); 3168 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3169 rela.r_addend = 0; 3170 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); 3171 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3172 3173 if (!h->def_regular) 3174 { 3175 /* Mark the symbol as undefined, rather than as defined in 3176 the .plt section. Leave the value alone. This is a clue 3177 for the dynamic linker, to make function pointer 3178 comparisons work between an application and shared 3179 library. */ 3180 sym->st_shndx = SHN_UNDEF; 3181 } 3182 } 3183 3184 if (h->got.offset != (bfd_vma) -1 3185 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3186 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3187 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3188 { 3189 Elf_Internal_Rela rela; 3190 bfd_byte *loc; 3191 3192 /* This symbol has an entry in the global offset table. Set it 3193 up. */ 3194 if (htab->sgot == NULL || htab->srelgot == NULL) 3195 abort (); 3196 3197 rela.r_offset = (htab->sgot->output_section->vma 3198 + htab->sgot->output_offset 3199 + (h->got.offset &~ (bfd_vma) 1)); 3200 3201 /* If this is a static link, or it is a -Bsymbolic link and the 3202 symbol is defined locally or was forced to be local because 3203 of a version file, we just want to emit a RELATIVE reloc. 3204 The entry in the global offset table will already have been 3205 initialized in the relocate_section function. */ 3206 if (info->shared 3207 && (info->symbolic 3208 || h->dynindx == -1 3209 || h->forced_local) 3210 && h->def_regular) 3211 { 3212 BFD_ASSERT((h->got.offset & 1) != 0); 3213 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 3214 rela.r_addend = (h->root.u.def.value 3215 + h->root.u.def.section->output_section->vma 3216 + h->root.u.def.section->output_offset); 3217 } 3218 else 3219 { 3220 BFD_ASSERT((h->got.offset & 1) == 0); 3221 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset); 3222 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); 3223 rela.r_addend = 0; 3224 } 3225 3226 loc = htab->srelgot->contents; 3227 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3228 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3229 } 3230 3231 if (h->needs_copy) 3232 { 3233 Elf_Internal_Rela rela; 3234 bfd_byte *loc; 3235 3236 /* This symbols needs a copy reloc. Set it up. */ 3237 3238 if (h->dynindx == -1 3239 || (h->root.type != bfd_link_hash_defined 3240 && h->root.type != bfd_link_hash_defweak) 3241 || htab->srelbss == NULL) 3242 abort (); 3243 3244 rela.r_offset = (h->root.u.def.value 3245 + h->root.u.def.section->output_section->vma 3246 + h->root.u.def.section->output_offset); 3247 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); 3248 rela.r_addend = 0; 3249 loc = htab->srelbss->contents; 3250 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); 3251 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3252 } 3253 3254 /* Mark some specially defined symbols as absolute. */ 3255 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3256 || h == htab->elf.hgot 3257 || h == htab->elf.hplt) 3258 sym->st_shndx = SHN_ABS; 3259 3260 return TRUE; 3261} 3262 3263/* Used to decide how to sort relocs in an optimal manner for the 3264 dynamic linker, before writing them out. */ 3265 3266static enum elf_reloc_type_class 3267elf_s390_reloc_type_class (rela) 3268 const Elf_Internal_Rela *rela; 3269{ 3270 switch ((int) ELF64_R_TYPE (rela->r_info)) 3271 { 3272 case R_390_RELATIVE: 3273 return reloc_class_relative; 3274 case R_390_JMP_SLOT: 3275 return reloc_class_plt; 3276 case R_390_COPY: 3277 return reloc_class_copy; 3278 default: 3279 return reloc_class_normal; 3280 } 3281} 3282 3283/* Finish up the dynamic sections. */ 3284 3285static bfd_boolean 3286elf_s390_finish_dynamic_sections (output_bfd, info) 3287 bfd *output_bfd; 3288 struct bfd_link_info *info; 3289{ 3290 struct elf_s390_link_hash_table *htab; 3291 bfd *dynobj; 3292 asection *sdyn; 3293 3294 htab = elf_s390_hash_table (info); 3295 dynobj = htab->elf.dynobj; 3296 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3297 3298 if (htab->elf.dynamic_sections_created) 3299 { 3300 Elf64_External_Dyn *dyncon, *dynconend; 3301 3302 if (sdyn == NULL || htab->sgot == NULL) 3303 abort (); 3304 3305 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3306 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 3307 for (; dyncon < dynconend; dyncon++) 3308 { 3309 Elf_Internal_Dyn dyn; 3310 asection *s; 3311 3312 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3313 3314 switch (dyn.d_tag) 3315 { 3316 default: 3317 continue; 3318 3319 case DT_PLTGOT: 3320 dyn.d_un.d_ptr = htab->sgot->output_section->vma; 3321 break; 3322 3323 case DT_JMPREL: 3324 dyn.d_un.d_ptr = htab->srelplt->output_section->vma; 3325 break; 3326 3327 case DT_PLTRELSZ: 3328 s = htab->srelplt->output_section; 3329 dyn.d_un.d_val = s->size; 3330 break; 3331 3332 case DT_RELASZ: 3333 /* The procedure linkage table relocs (DT_JMPREL) should 3334 not be included in the overall relocs (DT_RELA). 3335 Therefore, we override the DT_RELASZ entry here to 3336 make it not include the JMPREL relocs. Since the 3337 linker script arranges for .rela.plt to follow all 3338 other relocation sections, we don't have to worry 3339 about changing the DT_RELA entry. */ 3340 s = htab->srelplt->output_section; 3341 dyn.d_un.d_val -= s->size; 3342 break; 3343 } 3344 3345 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3346 } 3347 3348 /* Fill in the special first entry in the procedure linkage table. */ 3349 if (htab->splt && htab->splt->size > 0) 3350 { 3351 /* fill in blueprint for plt 0 entry */ 3352 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0, 3353 htab->splt->contents ); 3354 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, 3355 htab->splt->contents +4 ); 3356 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, 3357 htab->splt->contents +12 ); 3358 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, 3359 htab->splt->contents +16 ); 3360 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, 3361 htab->splt->contents +20 ); 3362 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6, 3363 htab->splt->contents + 24); 3364 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7, 3365 htab->splt->contents + 28 ); 3366 /* Fixup relative address to start of GOT */ 3367 bfd_put_32 (output_bfd, 3368 (htab->sgotplt->output_section->vma + 3369 htab->sgotplt->output_offset 3370 - htab->splt->output_section->vma - 6)/2, 3371 htab->splt->contents + 8); 3372 } 3373 elf_section_data (htab->splt->output_section) 3374 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; 3375 } 3376 3377 if (htab->sgotplt) 3378 { 3379 /* Fill in the first three entries in the global offset table. */ 3380 if (htab->sgotplt->size > 0) 3381 { 3382 bfd_put_64 (output_bfd, 3383 (sdyn == NULL ? (bfd_vma) 0 3384 : sdyn->output_section->vma + sdyn->output_offset), 3385 htab->sgotplt->contents); 3386 /* One entry for shared object struct ptr. */ 3387 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); 3388 /* One entry for _dl_runtime_resolve. */ 3389 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12); 3390 } 3391 3392 elf_section_data (htab->sgot->output_section) 3393 ->this_hdr.sh_entsize = 8; 3394 } 3395 return TRUE; 3396} 3397 3398/* Return address for Ith PLT stub in section PLT, for relocation REL 3399 or (bfd_vma) -1 if it should not be included. */ 3400 3401static bfd_vma 3402elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3403 const arelent *rel ATTRIBUTE_UNUSED) 3404{ 3405 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3406} 3407 3408 3409/* Why was the hash table entry size definition changed from 3410 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and 3411 this is the only reason for the s390_elf64_size_info structure. */ 3412 3413const struct elf_size_info s390_elf64_size_info = 3414{ 3415 sizeof (Elf64_External_Ehdr), 3416 sizeof (Elf64_External_Phdr), 3417 sizeof (Elf64_External_Shdr), 3418 sizeof (Elf64_External_Rel), 3419 sizeof (Elf64_External_Rela), 3420 sizeof (Elf64_External_Sym), 3421 sizeof (Elf64_External_Dyn), 3422 sizeof (Elf_External_Note), 3423 8, /* hash-table entry size. */ 3424 1, /* internal relocations per external relocations. */ 3425 64, /* arch_size. */ 3426 3, /* log_file_align. */ 3427 ELFCLASS64, EV_CURRENT, 3428 bfd_elf64_write_out_phdrs, 3429 bfd_elf64_write_shdrs_and_ehdr, 3430 bfd_elf64_write_relocs, 3431 bfd_elf64_swap_symbol_in, 3432 bfd_elf64_swap_symbol_out, 3433 bfd_elf64_slurp_reloc_table, 3434 bfd_elf64_slurp_symbol_table, 3435 bfd_elf64_swap_dyn_in, 3436 bfd_elf64_swap_dyn_out, 3437 bfd_elf64_swap_reloc_in, 3438 bfd_elf64_swap_reloc_out, 3439 bfd_elf64_swap_reloca_in, 3440 bfd_elf64_swap_reloca_out 3441}; 3442 3443#define TARGET_BIG_SYM bfd_elf64_s390_vec 3444#define TARGET_BIG_NAME "elf64-s390" 3445#define ELF_ARCH bfd_arch_s390 3446#define ELF_MACHINE_CODE EM_S390 3447#define ELF_MACHINE_ALT1 EM_S390_OLD 3448#define ELF_MAXPAGESIZE 0x1000 3449 3450#define elf_backend_size_info s390_elf64_size_info 3451 3452#define elf_backend_can_gc_sections 1 3453#define elf_backend_can_refcount 1 3454#define elf_backend_want_got_plt 1 3455#define elf_backend_plt_readonly 1 3456#define elf_backend_want_plt_sym 0 3457#define elf_backend_got_header_size 24 3458#define elf_backend_rela_normal 1 3459 3460#define elf_info_to_howto elf_s390_info_to_howto 3461 3462#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name 3463#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create 3464#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3465 3466#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3467#define elf_backend_check_relocs elf_s390_check_relocs 3468#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3469#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 3470#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3471#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3472#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3473#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 3474#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3475#define elf_backend_relocate_section elf_s390_relocate_section 3476#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 3477#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3478#define elf_backend_plt_sym_val elf_s390_plt_sym_val 3479 3480#define bfd_elf64_mkobject elf_s390_mkobject 3481#define elf_backend_object_p elf_s390_object_p 3482 3483#include "elf64-target.h" 3484