elf64-s390.c revision 130561
1/* IBM S/390-specific support for 64-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com). 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 20 02111-1307, USA. */ 21 22#include "bfd.h" 23#include "sysdep.h" 24#include "bfdlink.h" 25#include "libbfd.h" 26#include "elf-bfd.h" 27 28static reloc_howto_type *elf_s390_reloc_type_lookup 29 PARAMS ((bfd *, bfd_reloc_code_real_type)); 30static void elf_s390_info_to_howto 31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 32static bfd_boolean elf_s390_is_local_label_name 33 PARAMS ((bfd *, const char *)); 34static struct bfd_hash_entry *link_hash_newfunc 35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 36static struct bfd_link_hash_table *elf_s390_link_hash_table_create 37 PARAMS ((bfd *)); 38static bfd_boolean create_got_section 39 PARAMS((bfd *, struct bfd_link_info *)); 40static bfd_boolean elf_s390_create_dynamic_sections 41 PARAMS((bfd *, struct bfd_link_info *)); 42static void elf_s390_copy_indirect_symbol 43 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *, 44 struct elf_link_hash_entry *)); 45static bfd_boolean elf_s390_check_relocs 46 PARAMS ((bfd *, struct bfd_link_info *, asection *, 47 const Elf_Internal_Rela *)); 48static asection *elf_s390_gc_mark_hook 49 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, 50 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 51static bfd_boolean elf_s390_gc_sweep_hook 52 PARAMS ((bfd *, struct bfd_link_info *, asection *, 53 const Elf_Internal_Rela *)); 54struct elf_s390_link_hash_entry; 55static void elf_s390_adjust_gotplt 56 PARAMS ((struct elf_s390_link_hash_entry *)); 57static bfd_boolean elf_s390_adjust_dynamic_symbol 58 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 59static bfd_boolean allocate_dynrelocs 60 PARAMS ((struct elf_link_hash_entry *, PTR)); 61static bfd_boolean readonly_dynrelocs 62 PARAMS ((struct elf_link_hash_entry *, PTR)); 63static bfd_boolean elf_s390_size_dynamic_sections 64 PARAMS ((bfd *, struct bfd_link_info *)); 65static bfd_boolean elf_s390_relocate_section 66 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 67 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 68static bfd_boolean elf_s390_finish_dynamic_symbol 69 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 70 Elf_Internal_Sym *)); 71static enum elf_reloc_type_class elf_s390_reloc_type_class 72 PARAMS ((const Elf_Internal_Rela *)); 73static bfd_boolean elf_s390_finish_dynamic_sections 74 PARAMS ((bfd *, struct bfd_link_info *)); 75static bfd_boolean elf_s390_mkobject 76 PARAMS ((bfd *)); 77static bfd_boolean elf_s390_object_p 78 PARAMS ((bfd *)); 79static int elf_s390_tls_transition 80 PARAMS ((struct bfd_link_info *, int, int)); 81static bfd_reloc_status_type s390_tls_reloc 82 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 83static bfd_vma dtpoff_base 84 PARAMS ((struct bfd_link_info *)); 85static bfd_vma tpoff 86 PARAMS ((struct bfd_link_info *, bfd_vma)); 87static void invalid_tls_insn 88 PARAMS ((bfd *, asection *, Elf_Internal_Rela *)); 89static bfd_reloc_status_type s390_elf_ldisp_reloc 90 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 91 92#include "elf/s390.h" 93 94/* In case we're on a 32-bit machine, construct a 64-bit "-1" value 95 from smaller values. Start with zero, widen, *then* decrement. */ 96#define MINUS_ONE (((bfd_vma)0) - 1) 97 98/* The relocation "howto" table. */ 99static reloc_howto_type elf_howto_table[] = 100{ 101 HOWTO (R_390_NONE, /* type */ 102 0, /* rightshift */ 103 0, /* size (0 = byte, 1 = short, 2 = long) */ 104 0, /* bitsize */ 105 FALSE, /* pc_relative */ 106 0, /* bitpos */ 107 complain_overflow_dont, /* complain_on_overflow */ 108 bfd_elf_generic_reloc, /* special_function */ 109 "R_390_NONE", /* name */ 110 FALSE, /* partial_inplace */ 111 0, /* src_mask */ 112 0, /* dst_mask */ 113 FALSE), /* pcrel_offset */ 114 115 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 116 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 117 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 118 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 119 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 120 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 121 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 122 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 123 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 124 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 125 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 126 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 127 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 128 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 129 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 130 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 131 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 132 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE), 133 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 134 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE), 135 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 136 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE), 137 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 138 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE), 139 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 140 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE), 141 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 142 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE), 143 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 144 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 145 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 146 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 147 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 148 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 149 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 150 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 151 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 152 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 153 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 154 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 155 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 156 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE), 157 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 158 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE), 159 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 160 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE), 161 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 162 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE), 163 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 164 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE), 165 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 166 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE), 167 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 168 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 169 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 170 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE), 171 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 172 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 173 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 174 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 175 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 176 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 177 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 178 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE), 179 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 180 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE), 181 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 182 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 183 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 184 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 185 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 186 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE), 187 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 188 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 189 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 190 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 191 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 192 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 193 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */ 194 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 195 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE), 196 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 197 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 198 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */ 199 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 200 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE), 201 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */ 202 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 203 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE), 204 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */ 205 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 206 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE), 207 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 208 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE), 209 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */ 210 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 211 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE), 212 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */ 213 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 214 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE), 215 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 216 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE), 217 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 218 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE), 219 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 220 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE), 221 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 222 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 223 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 224 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 225 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 226 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 227 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 228 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 229}; 230 231/* GNU extension to record C++ vtable hierarchy. */ 232static reloc_howto_type elf64_s390_vtinherit_howto = 233 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 234static reloc_howto_type elf64_s390_vtentry_howto = 235 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); 236 237static reloc_howto_type * 238elf_s390_reloc_type_lookup (abfd, code) 239 bfd *abfd ATTRIBUTE_UNUSED; 240 bfd_reloc_code_real_type code; 241{ 242 switch (code) 243 { 244 case BFD_RELOC_NONE: 245 return &elf_howto_table[(int) R_390_NONE]; 246 case BFD_RELOC_8: 247 return &elf_howto_table[(int) R_390_8]; 248 case BFD_RELOC_390_12: 249 return &elf_howto_table[(int) R_390_12]; 250 case BFD_RELOC_16: 251 return &elf_howto_table[(int) R_390_16]; 252 case BFD_RELOC_32: 253 return &elf_howto_table[(int) R_390_32]; 254 case BFD_RELOC_CTOR: 255 return &elf_howto_table[(int) R_390_32]; 256 case BFD_RELOC_32_PCREL: 257 return &elf_howto_table[(int) R_390_PC32]; 258 case BFD_RELOC_390_GOT12: 259 return &elf_howto_table[(int) R_390_GOT12]; 260 case BFD_RELOC_32_GOT_PCREL: 261 return &elf_howto_table[(int) R_390_GOT32]; 262 case BFD_RELOC_390_PLT32: 263 return &elf_howto_table[(int) R_390_PLT32]; 264 case BFD_RELOC_390_COPY: 265 return &elf_howto_table[(int) R_390_COPY]; 266 case BFD_RELOC_390_GLOB_DAT: 267 return &elf_howto_table[(int) R_390_GLOB_DAT]; 268 case BFD_RELOC_390_JMP_SLOT: 269 return &elf_howto_table[(int) R_390_JMP_SLOT]; 270 case BFD_RELOC_390_RELATIVE: 271 return &elf_howto_table[(int) R_390_RELATIVE]; 272 case BFD_RELOC_32_GOTOFF: 273 return &elf_howto_table[(int) R_390_GOTOFF32]; 274 case BFD_RELOC_390_GOTPC: 275 return &elf_howto_table[(int) R_390_GOTPC]; 276 case BFD_RELOC_390_GOT16: 277 return &elf_howto_table[(int) R_390_GOT16]; 278 case BFD_RELOC_16_PCREL: 279 return &elf_howto_table[(int) R_390_PC16]; 280 case BFD_RELOC_390_PC16DBL: 281 return &elf_howto_table[(int) R_390_PC16DBL]; 282 case BFD_RELOC_390_PLT16DBL: 283 return &elf_howto_table[(int) R_390_PLT16DBL]; 284 case BFD_RELOC_390_PC32DBL: 285 return &elf_howto_table[(int) R_390_PC32DBL]; 286 case BFD_RELOC_390_PLT32DBL: 287 return &elf_howto_table[(int) R_390_PLT32DBL]; 288 case BFD_RELOC_390_GOTPCDBL: 289 return &elf_howto_table[(int) R_390_GOTPCDBL]; 290 case BFD_RELOC_64: 291 return &elf_howto_table[(int) R_390_64]; 292 case BFD_RELOC_64_PCREL: 293 return &elf_howto_table[(int) R_390_PC64]; 294 case BFD_RELOC_390_GOT64: 295 return &elf_howto_table[(int) R_390_GOT64]; 296 case BFD_RELOC_390_PLT64: 297 return &elf_howto_table[(int) R_390_PLT64]; 298 case BFD_RELOC_390_GOTENT: 299 return &elf_howto_table[(int) R_390_GOTENT]; 300 case BFD_RELOC_16_GOTOFF: 301 return &elf_howto_table[(int) R_390_GOTOFF16]; 302 case BFD_RELOC_390_GOTOFF64: 303 return &elf_howto_table[(int) R_390_GOTOFF64]; 304 case BFD_RELOC_390_GOTPLT12: 305 return &elf_howto_table[(int) R_390_GOTPLT12]; 306 case BFD_RELOC_390_GOTPLT16: 307 return &elf_howto_table[(int) R_390_GOTPLT16]; 308 case BFD_RELOC_390_GOTPLT32: 309 return &elf_howto_table[(int) R_390_GOTPLT32]; 310 case BFD_RELOC_390_GOTPLT64: 311 return &elf_howto_table[(int) R_390_GOTPLT64]; 312 case BFD_RELOC_390_GOTPLTENT: 313 return &elf_howto_table[(int) R_390_GOTPLTENT]; 314 case BFD_RELOC_390_PLTOFF16: 315 return &elf_howto_table[(int) R_390_PLTOFF16]; 316 case BFD_RELOC_390_PLTOFF32: 317 return &elf_howto_table[(int) R_390_PLTOFF32]; 318 case BFD_RELOC_390_PLTOFF64: 319 return &elf_howto_table[(int) R_390_PLTOFF64]; 320 case BFD_RELOC_390_TLS_LOAD: 321 return &elf_howto_table[(int) R_390_TLS_LOAD]; 322 case BFD_RELOC_390_TLS_GDCALL: 323 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 324 case BFD_RELOC_390_TLS_LDCALL: 325 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 326 case BFD_RELOC_390_TLS_GD64: 327 return &elf_howto_table[(int) R_390_TLS_GD64]; 328 case BFD_RELOC_390_TLS_GOTIE12: 329 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 330 case BFD_RELOC_390_TLS_GOTIE64: 331 return &elf_howto_table[(int) R_390_TLS_GOTIE64]; 332 case BFD_RELOC_390_TLS_LDM64: 333 return &elf_howto_table[(int) R_390_TLS_LDM64]; 334 case BFD_RELOC_390_TLS_IE64: 335 return &elf_howto_table[(int) R_390_TLS_IE64]; 336 case BFD_RELOC_390_TLS_IEENT: 337 return &elf_howto_table[(int) R_390_TLS_IEENT]; 338 case BFD_RELOC_390_TLS_LE64: 339 return &elf_howto_table[(int) R_390_TLS_LE64]; 340 case BFD_RELOC_390_TLS_LDO64: 341 return &elf_howto_table[(int) R_390_TLS_LDO64]; 342 case BFD_RELOC_390_TLS_DTPMOD: 343 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 344 case BFD_RELOC_390_TLS_DTPOFF: 345 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 346 case BFD_RELOC_390_TLS_TPOFF: 347 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 348 case BFD_RELOC_390_20: 349 return &elf_howto_table[(int) R_390_20]; 350 case BFD_RELOC_390_GOT20: 351 return &elf_howto_table[(int) R_390_GOT20]; 352 case BFD_RELOC_390_GOTPLT20: 353 return &elf_howto_table[(int) R_390_GOTPLT20]; 354 case BFD_RELOC_390_TLS_GOTIE20: 355 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 356 case BFD_RELOC_VTABLE_INHERIT: 357 return &elf64_s390_vtinherit_howto; 358 case BFD_RELOC_VTABLE_ENTRY: 359 return &elf64_s390_vtentry_howto; 360 default: 361 break; 362 } 363 return 0; 364} 365 366/* We need to use ELF64_R_TYPE so we have our own copy of this function, 367 and elf64-s390.c has its own copy. */ 368 369static void 370elf_s390_info_to_howto (abfd, cache_ptr, dst) 371 bfd *abfd ATTRIBUTE_UNUSED; 372 arelent *cache_ptr; 373 Elf_Internal_Rela *dst; 374{ 375 switch (ELF64_R_TYPE(dst->r_info)) 376 { 377 case R_390_GNU_VTINHERIT: 378 cache_ptr->howto = &elf64_s390_vtinherit_howto; 379 break; 380 381 case R_390_GNU_VTENTRY: 382 cache_ptr->howto = &elf64_s390_vtentry_howto; 383 break; 384 385 default: 386 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max); 387 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)]; 388 } 389} 390 391/* A relocation function which doesn't do anything. */ 392static bfd_reloc_status_type 393s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section, 394 output_bfd, error_message) 395 bfd *abfd ATTRIBUTE_UNUSED; 396 arelent *reloc_entry; 397 asymbol *symbol ATTRIBUTE_UNUSED; 398 PTR data ATTRIBUTE_UNUSED; 399 asection *input_section; 400 bfd *output_bfd; 401 char **error_message ATTRIBUTE_UNUSED; 402{ 403 if (output_bfd) 404 reloc_entry->address += input_section->output_offset; 405 return bfd_reloc_ok; 406} 407 408/* Handle the large displacement relocs. */ 409static bfd_reloc_status_type 410s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section, 411 output_bfd, error_message) 412 bfd *abfd; 413 arelent *reloc_entry; 414 asymbol *symbol; 415 PTR data; 416 asection *input_section; 417 bfd *output_bfd; 418 char **error_message ATTRIBUTE_UNUSED; 419{ 420 reloc_howto_type *howto = reloc_entry->howto; 421 bfd_vma relocation; 422 bfd_vma insn; 423 424 if (output_bfd != (bfd *) NULL 425 && (symbol->flags & BSF_SECTION_SYM) == 0 426 && (! howto->partial_inplace 427 || reloc_entry->addend == 0)) 428 { 429 reloc_entry->address += input_section->output_offset; 430 return bfd_reloc_ok; 431 } 432 if (output_bfd != NULL) 433 return bfd_reloc_continue; 434 435 if (reloc_entry->address > input_section->_cooked_size) 436 return bfd_reloc_outofrange; 437 438 relocation = (symbol->value 439 + symbol->section->output_section->vma 440 + symbol->section->output_offset); 441 relocation += reloc_entry->addend; 442 if (howto->pc_relative) 443 { 444 relocation -= (input_section->output_section->vma 445 + input_section->output_offset); 446 relocation -= reloc_entry->address; 447 } 448 449 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 450 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 451 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 452 453 if ((bfd_signed_vma) relocation < - 0x80000 454 || (bfd_signed_vma) relocation > 0x7ffff) 455 return bfd_reloc_overflow; 456 else 457 return bfd_reloc_ok; 458} 459 460static bfd_boolean 461elf_s390_is_local_label_name (abfd, name) 462 bfd *abfd; 463 const char *name; 464{ 465 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 466 return TRUE; 467 468 return _bfd_elf_is_local_label_name (abfd, name); 469} 470 471/* Functions for the 390 ELF linker. */ 472 473/* The name of the dynamic interpreter. This is put in the .interp 474 section. */ 475 476#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 477 478/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 479 copying dynamic variables from a shared lib into an app's dynbss 480 section, and instead use a dynamic relocation to point into the 481 shared lib. */ 482#define ELIMINATE_COPY_RELOCS 1 483 484/* The size in bytes of the first entry in the procedure linkage table. */ 485#define PLT_FIRST_ENTRY_SIZE 32 486/* The size in bytes of an entry in the procedure linkage table. */ 487#define PLT_ENTRY_SIZE 32 488 489#define GOT_ENTRY_SIZE 8 490 491/* The first three entries in a procedure linkage table are reserved, 492 and the initial contents are unimportant (we zero them out). 493 Subsequent entries look like this. See the SVR4 ABI 386 494 supplement to see how this works. */ 495 496/* For the s390, simple addr offset can only be 0 - 4096. 497 To use the full 16777216 TB address space, several instructions 498 are needed to load an address in a register and execute 499 a branch( or just saving the address) 500 501 Furthermore, only r 0 and 1 are free to use!!! */ 502 503/* The first 3 words in the GOT are then reserved. 504 Word 0 is the address of the dynamic table. 505 Word 1 is a pointer to a structure describing the object 506 Word 2 is used to point to the loader entry address. 507 508 The code for PLT entries looks like this: 509 510 The GOT holds the address in the PLT to be executed. 511 The loader then gets: 512 24(15) = Pointer to the structure describing the object. 513 28(15) = Offset in symbol table 514 The loader must then find the module where the function is 515 and insert the address in the GOT. 516 517 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 518 LG 1,0(1) # 6 bytes Load address from GOT in r1 519 BCR 15,1 # 2 bytes Jump to address 520 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 521 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 522 BRCL 15,-x # 6 bytes Jump to start of PLT 523 .long ? # 4 bytes offset into symbol table 524 525 Total = 32 bytes per PLT entry 526 Fixup at offset 2: relative address to GOT entry 527 Fixup at offset 22: relative branch to PLT0 528 Fixup at offset 28: 32 bit offset into symbol table 529 530 A 32 bit offset into the symbol table is enough. It allows for symbol 531 tables up to a size of 2 gigabyte. A single dynamic object (the main 532 program, any shared library) is limited to 4GB in size and I want to see 533 the program that manages to have a symbol table of more than 2 GB with a 534 total size of at max 4 GB. */ 535 536#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000 537#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 538#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 539#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 540#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c 541#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 542#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 543#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000 544 545/* The first PLT entry pushes the offset into the symbol table 546 from R1 onto the stack at 8(15) and the loader object info 547 at 12(15), loads the loader address in R1 and jumps to it. */ 548 549/* The first entry in the PLT: 550 551 PLT0: 552 STG 1,56(15) # r1 contains the offset into the symbol table 553 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table 554 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack 555 LG 1,16(1) # get entry address of loader 556 BCR 15,1 # jump to loader 557 558 Fixup at offset 8: relative address to start of GOT. */ 559 560#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038 561#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 562#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 563#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 564#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 565#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 566#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 567#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 568 569/* The s390 linker needs to keep track of the number of relocs that it 570 decides to copy as dynamic relocs in check_relocs for each symbol. 571 This is so that it can later discard them if they are found to be 572 unnecessary. We store the information in a field extending the 573 regular ELF linker hash table. */ 574 575struct elf_s390_dyn_relocs 576{ 577 struct elf_s390_dyn_relocs *next; 578 579 /* The input section of the reloc. */ 580 asection *sec; 581 582 /* Total number of relocs copied for the input section. */ 583 bfd_size_type count; 584 585 /* Number of pc-relative relocs copied for the input section. */ 586 bfd_size_type pc_count; 587}; 588 589/* s390 ELF linker hash entry. */ 590 591struct elf_s390_link_hash_entry 592{ 593 struct elf_link_hash_entry elf; 594 595 /* Track dynamic relocs copied for this symbol. */ 596 struct elf_s390_dyn_relocs *dyn_relocs; 597 598 /* Number of GOTPLT references for a function. */ 599 bfd_signed_vma gotplt_refcount; 600 601#define GOT_UNKNOWN 0 602#define GOT_NORMAL 1 603#define GOT_TLS_GD 2 604#define GOT_TLS_IE 3 605#define GOT_TLS_IE_NLT 3 606 unsigned char tls_type; 607}; 608 609#define elf_s390_hash_entry(ent) \ 610 ((struct elf_s390_link_hash_entry *)(ent)) 611 612struct elf_s390_obj_tdata 613{ 614 struct elf_obj_tdata root; 615 616 /* tls_type for each local got entry. */ 617 char *local_got_tls_type; 618}; 619 620#define elf_s390_tdata(abfd) \ 621 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 622 623#define elf_s390_local_got_tls_type(abfd) \ 624 (elf_s390_tdata (abfd)->local_got_tls_type) 625 626static bfd_boolean 627elf_s390_mkobject (abfd) 628 bfd *abfd; 629{ 630 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata); 631 abfd->tdata.any = bfd_zalloc (abfd, amt); 632 if (abfd->tdata.any == NULL) 633 return FALSE; 634 return TRUE; 635} 636 637static bfd_boolean 638elf_s390_object_p (abfd) 639 bfd *abfd; 640{ 641 /* Set the right machine number for an s390 elf32 file. */ 642 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); 643} 644 645/* s390 ELF linker hash table. */ 646 647struct elf_s390_link_hash_table 648{ 649 struct elf_link_hash_table elf; 650 651 /* Short-cuts to get to dynamic linker sections. */ 652 asection *sgot; 653 asection *sgotplt; 654 asection *srelgot; 655 asection *splt; 656 asection *srelplt; 657 asection *sdynbss; 658 asection *srelbss; 659 660 union { 661 bfd_signed_vma refcount; 662 bfd_vma offset; 663 } tls_ldm_got; 664 665 /* Small local sym to section mapping cache. */ 666 struct sym_sec_cache sym_sec; 667}; 668 669/* Get the s390 ELF linker hash table from a link_info structure. */ 670 671#define elf_s390_hash_table(p) \ 672 ((struct elf_s390_link_hash_table *) ((p)->hash)) 673 674/* Create an entry in an s390 ELF linker hash table. */ 675 676static struct bfd_hash_entry * 677link_hash_newfunc (entry, table, string) 678 struct bfd_hash_entry *entry; 679 struct bfd_hash_table *table; 680 const char *string; 681{ 682 /* Allocate the structure if it has not already been allocated by a 683 subclass. */ 684 if (entry == NULL) 685 { 686 entry = bfd_hash_allocate (table, 687 sizeof (struct elf_s390_link_hash_entry)); 688 if (entry == NULL) 689 return entry; 690 } 691 692 /* Call the allocation method of the superclass. */ 693 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 694 if (entry != NULL) 695 { 696 struct elf_s390_link_hash_entry *eh; 697 698 eh = (struct elf_s390_link_hash_entry *) entry; 699 eh->dyn_relocs = NULL; 700 eh->gotplt_refcount = 0; 701 eh->tls_type = GOT_UNKNOWN; 702 } 703 704 return entry; 705} 706 707/* Create an s390 ELF linker hash table. */ 708 709static struct bfd_link_hash_table * 710elf_s390_link_hash_table_create (abfd) 711 bfd *abfd; 712{ 713 struct elf_s390_link_hash_table *ret; 714 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 715 716 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt); 717 if (ret == NULL) 718 return NULL; 719 720 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) 721 { 722 free (ret); 723 return NULL; 724 } 725 726 ret->sgot = NULL; 727 ret->sgotplt = NULL; 728 ret->srelgot = NULL; 729 ret->splt = NULL; 730 ret->srelplt = NULL; 731 ret->sdynbss = NULL; 732 ret->srelbss = NULL; 733 ret->tls_ldm_got.refcount = 0; 734 ret->sym_sec.abfd = NULL; 735 736 return &ret->elf.root; 737} 738 739/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 740 shortcuts to them in our hash table. */ 741 742static bfd_boolean 743create_got_section (dynobj, info) 744 bfd *dynobj; 745 struct bfd_link_info *info; 746{ 747 struct elf_s390_link_hash_table *htab; 748 749 if (! _bfd_elf_create_got_section (dynobj, info)) 750 return FALSE; 751 752 htab = elf_s390_hash_table (info); 753 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 754 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 755 if (!htab->sgot || !htab->sgotplt) 756 abort (); 757 758 htab->srelgot = bfd_make_section (dynobj, ".rela.got"); 759 if (htab->srelgot == NULL 760 || ! bfd_set_section_flags (dynobj, htab->srelgot, 761 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 762 | SEC_IN_MEMORY | SEC_LINKER_CREATED 763 | SEC_READONLY)) 764 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) 765 return FALSE; 766 return TRUE; 767} 768 769/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 770 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 771 hash table. */ 772 773static bfd_boolean 774elf_s390_create_dynamic_sections (dynobj, info) 775 bfd *dynobj; 776 struct bfd_link_info *info; 777{ 778 struct elf_s390_link_hash_table *htab; 779 780 htab = elf_s390_hash_table (info); 781 if (!htab->sgot && !create_got_section (dynobj, info)) 782 return FALSE; 783 784 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 785 return FALSE; 786 787 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 788 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 789 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 790 if (!info->shared) 791 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 792 793 if (!htab->splt || !htab->srelplt || !htab->sdynbss 794 || (!info->shared && !htab->srelbss)) 795 abort (); 796 797 return TRUE; 798} 799 800/* Copy the extra info we tack onto an elf_link_hash_entry. */ 801 802static void 803elf_s390_copy_indirect_symbol (bed, dir, ind) 804 const struct elf_backend_data *bed; 805 struct elf_link_hash_entry *dir, *ind; 806{ 807 struct elf_s390_link_hash_entry *edir, *eind; 808 809 edir = (struct elf_s390_link_hash_entry *) dir; 810 eind = (struct elf_s390_link_hash_entry *) ind; 811 812 if (eind->dyn_relocs != NULL) 813 { 814 if (edir->dyn_relocs != NULL) 815 { 816 struct elf_s390_dyn_relocs **pp; 817 struct elf_s390_dyn_relocs *p; 818 819 if (ind->root.type == bfd_link_hash_indirect) 820 abort (); 821 822 /* Add reloc counts against the weak sym to the strong sym 823 list. Merge any entries against the same section. */ 824 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 825 { 826 struct elf_s390_dyn_relocs *q; 827 828 for (q = edir->dyn_relocs; q != NULL; q = q->next) 829 if (q->sec == p->sec) 830 { 831 q->pc_count += p->pc_count; 832 q->count += p->count; 833 *pp = p->next; 834 break; 835 } 836 if (q == NULL) 837 pp = &p->next; 838 } 839 *pp = edir->dyn_relocs; 840 } 841 842 edir->dyn_relocs = eind->dyn_relocs; 843 eind->dyn_relocs = NULL; 844 } 845 846 if (ind->root.type == bfd_link_hash_indirect 847 && dir->got.refcount <= 0) 848 { 849 edir->tls_type = eind->tls_type; 850 eind->tls_type = GOT_UNKNOWN; 851 } 852 853 if (ELIMINATE_COPY_RELOCS 854 && ind->root.type != bfd_link_hash_indirect 855 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0) 856 /* If called to transfer flags for a weakdef during processing 857 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF. 858 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 859 dir->elf_link_hash_flags |= 860 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC 861 | ELF_LINK_HASH_REF_REGULAR 862 | ELF_LINK_HASH_REF_REGULAR_NONWEAK 863 | ELF_LINK_HASH_NEEDS_PLT)); 864 else 865 _bfd_elf_link_hash_copy_indirect (bed, dir, ind); 866} 867 868static int 869elf_s390_tls_transition (info, r_type, is_local) 870 struct bfd_link_info *info; 871 int r_type; 872 int is_local; 873{ 874 if (info->shared) 875 return r_type; 876 877 switch (r_type) 878 { 879 case R_390_TLS_GD64: 880 case R_390_TLS_IE64: 881 if (is_local) 882 return R_390_TLS_LE64; 883 return R_390_TLS_IE64; 884 case R_390_TLS_GOTIE64: 885 if (is_local) 886 return R_390_TLS_LE64; 887 return R_390_TLS_GOTIE64; 888 case R_390_TLS_LDM64: 889 return R_390_TLS_LE64; 890 } 891 892 return r_type; 893} 894 895/* Look through the relocs for a section during the first phase, and 896 allocate space in the global offset table or procedure linkage 897 table. */ 898 899static bfd_boolean 900elf_s390_check_relocs (abfd, info, sec, relocs) 901 bfd *abfd; 902 struct bfd_link_info *info; 903 asection *sec; 904 const Elf_Internal_Rela *relocs; 905{ 906 struct elf_s390_link_hash_table *htab; 907 Elf_Internal_Shdr *symtab_hdr; 908 struct elf_link_hash_entry **sym_hashes; 909 const Elf_Internal_Rela *rel; 910 const Elf_Internal_Rela *rel_end; 911 asection *sreloc; 912 bfd_signed_vma *local_got_refcounts; 913 int tls_type, old_tls_type; 914 915 if (info->relocatable) 916 return TRUE; 917 918 htab = elf_s390_hash_table (info); 919 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 920 sym_hashes = elf_sym_hashes (abfd); 921 local_got_refcounts = elf_local_got_refcounts (abfd); 922 923 sreloc = NULL; 924 925 rel_end = relocs + sec->reloc_count; 926 for (rel = relocs; rel < rel_end; rel++) 927 { 928 unsigned int r_type; 929 unsigned long r_symndx; 930 struct elf_link_hash_entry *h; 931 932 r_symndx = ELF64_R_SYM (rel->r_info); 933 934 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 935 { 936 (*_bfd_error_handler) (_("%s: bad symbol index: %d"), 937 bfd_archive_filename (abfd), 938 r_symndx); 939 return FALSE; 940 } 941 942 if (r_symndx < symtab_hdr->sh_info) 943 h = NULL; 944 else 945 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 946 947 /* Create got section and local_got_refcounts array if they 948 are needed. */ 949 r_type = elf_s390_tls_transition (info, 950 ELF64_R_TYPE (rel->r_info), 951 h == NULL); 952 switch (r_type) 953 { 954 case R_390_GOT12: 955 case R_390_GOT16: 956 case R_390_GOT20: 957 case R_390_GOT32: 958 case R_390_GOT64: 959 case R_390_GOTENT: 960 case R_390_GOTPLT12: 961 case R_390_GOTPLT16: 962 case R_390_GOTPLT20: 963 case R_390_GOTPLT32: 964 case R_390_GOTPLT64: 965 case R_390_GOTPLTENT: 966 case R_390_TLS_GD64: 967 case R_390_TLS_GOTIE12: 968 case R_390_TLS_GOTIE20: 969 case R_390_TLS_GOTIE64: 970 case R_390_TLS_IEENT: 971 case R_390_TLS_IE64: 972 case R_390_TLS_LDM64: 973 if (h == NULL 974 && local_got_refcounts == NULL) 975 { 976 bfd_size_type size; 977 978 size = symtab_hdr->sh_info; 979 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 980 local_got_refcounts = ((bfd_signed_vma *) 981 bfd_zalloc (abfd, size)); 982 if (local_got_refcounts == NULL) 983 return FALSE; 984 elf_local_got_refcounts (abfd) = local_got_refcounts; 985 elf_s390_local_got_tls_type (abfd) 986 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 987 } 988 /* Fall through. */ 989 case R_390_GOTOFF16: 990 case R_390_GOTOFF32: 991 case R_390_GOTOFF64: 992 case R_390_GOTPC: 993 case R_390_GOTPCDBL: 994 if (htab->sgot == NULL) 995 { 996 if (htab->elf.dynobj == NULL) 997 htab->elf.dynobj = abfd; 998 if (!create_got_section (htab->elf.dynobj, info)) 999 return FALSE; 1000 } 1001 } 1002 1003 switch (r_type) 1004 { 1005 case R_390_GOTOFF16: 1006 case R_390_GOTOFF32: 1007 case R_390_GOTOFF64: 1008 case R_390_GOTPC: 1009 case R_390_GOTPCDBL: 1010 /* Got is created, nothing to be done. */ 1011 break; 1012 1013 case R_390_PLT16DBL: 1014 case R_390_PLT32: 1015 case R_390_PLT32DBL: 1016 case R_390_PLT64: 1017 case R_390_PLTOFF16: 1018 case R_390_PLTOFF32: 1019 case R_390_PLTOFF64: 1020 /* This symbol requires a procedure linkage table entry. We 1021 actually build the entry in adjust_dynamic_symbol, 1022 because this might be a case of linking PIC code which is 1023 never referenced by a dynamic object, in which case we 1024 don't need to generate a procedure linkage table entry 1025 after all. */ 1026 1027 /* If this is a local symbol, we resolve it directly without 1028 creating a procedure linkage table entry. */ 1029 if (h != NULL) 1030 { 1031 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 1032 h->plt.refcount += 1; 1033 } 1034 break; 1035 1036 case R_390_GOTPLT12: 1037 case R_390_GOTPLT16: 1038 case R_390_GOTPLT20: 1039 case R_390_GOTPLT32: 1040 case R_390_GOTPLT64: 1041 case R_390_GOTPLTENT: 1042 /* This symbol requires either a procedure linkage table entry 1043 or an entry in the local got. We actually build the entry 1044 in adjust_dynamic_symbol because whether this is really a 1045 global reference can change and with it the fact if we have 1046 to create a plt entry or a local got entry. To be able to 1047 make a once global symbol a local one we have to keep track 1048 of the number of gotplt references that exist for this 1049 symbol. */ 1050 if (h != NULL) 1051 { 1052 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1053 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 1054 h->plt.refcount += 1; 1055 } 1056 else 1057 local_got_refcounts[r_symndx] += 1; 1058 break; 1059 1060 case R_390_TLS_LDM64: 1061 htab->tls_ldm_got.refcount += 1; 1062 break; 1063 1064 case R_390_TLS_IE64: 1065 case R_390_TLS_GOTIE12: 1066 case R_390_TLS_GOTIE20: 1067 case R_390_TLS_GOTIE64: 1068 case R_390_TLS_IEENT: 1069 if (info->shared) 1070 info->flags |= DF_STATIC_TLS; 1071 /* Fall through */ 1072 1073 case R_390_GOT12: 1074 case R_390_GOT16: 1075 case R_390_GOT20: 1076 case R_390_GOT32: 1077 case R_390_GOT64: 1078 case R_390_GOTENT: 1079 case R_390_TLS_GD64: 1080 /* This symbol requires a global offset table entry. */ 1081 switch (r_type) 1082 { 1083 default: 1084 case R_390_GOT12: 1085 case R_390_GOT16: 1086 case R_390_GOT20: 1087 case R_390_GOT32: 1088 case R_390_GOTENT: 1089 tls_type = GOT_NORMAL; 1090 break; 1091 case R_390_TLS_GD64: 1092 tls_type = GOT_TLS_GD; 1093 break; 1094 case R_390_TLS_IE64: 1095 case R_390_TLS_GOTIE64: 1096 tls_type = GOT_TLS_IE; 1097 break; 1098 case R_390_TLS_GOTIE12: 1099 case R_390_TLS_GOTIE20: 1100 case R_390_TLS_IEENT: 1101 tls_type = GOT_TLS_IE_NLT; 1102 break; 1103 } 1104 1105 if (h != NULL) 1106 { 1107 h->got.refcount += 1; 1108 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1109 } 1110 else 1111 { 1112 local_got_refcounts[r_symndx] += 1; 1113 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1114 } 1115 /* If a TLS symbol is accessed using IE at least once, 1116 there is no point to use dynamic model for it. */ 1117 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1118 { 1119 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1120 { 1121 (*_bfd_error_handler) 1122 (_("%s: `%s' accessed both as normal and thread local symbol"), 1123 bfd_archive_filename (abfd), h->root.root.string); 1124 return FALSE; 1125 } 1126 if (old_tls_type > tls_type) 1127 tls_type = old_tls_type; 1128 } 1129 1130 if (old_tls_type != tls_type) 1131 { 1132 if (h != NULL) 1133 elf_s390_hash_entry (h)->tls_type = tls_type; 1134 else 1135 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1136 } 1137 1138 if (r_type != R_390_TLS_IE64) 1139 break; 1140 /* Fall through */ 1141 1142 case R_390_TLS_LE64: 1143 if (!info->shared) 1144 break; 1145 info->flags |= DF_STATIC_TLS; 1146 /* Fall through */ 1147 1148 case R_390_8: 1149 case R_390_16: 1150 case R_390_32: 1151 case R_390_64: 1152 case R_390_PC16: 1153 case R_390_PC16DBL: 1154 case R_390_PC32: 1155 case R_390_PC32DBL: 1156 case R_390_PC64: 1157 if (h != NULL && !info->shared) 1158 { 1159 /* If this reloc is in a read-only section, we might 1160 need a copy reloc. We can't check reliably at this 1161 stage whether the section is read-only, as input 1162 sections have not yet been mapped to output sections. 1163 Tentatively set the flag for now, and correct in 1164 adjust_dynamic_symbol. */ 1165 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; 1166 1167 /* We may need a .plt entry if the function this reloc 1168 refers to is in a shared lib. */ 1169 h->plt.refcount += 1; 1170 } 1171 1172 /* If we are creating a shared library, and this is a reloc 1173 against a global symbol, or a non PC relative reloc 1174 against a local symbol, then we need to copy the reloc 1175 into the shared library. However, if we are linking with 1176 -Bsymbolic, we do not need to copy a reloc against a 1177 global symbol which is defined in an object we are 1178 including in the link (i.e., DEF_REGULAR is set). At 1179 this point we have not seen all the input files, so it is 1180 possible that DEF_REGULAR is not set now but will be set 1181 later (it is never cleared). In case of a weak definition, 1182 DEF_REGULAR may be cleared later by a strong definition in 1183 a shared library. We account for that possibility below by 1184 storing information in the relocs_copied field of the hash 1185 table entry. A similar situation occurs when creating 1186 shared libraries and symbol visibility changes render the 1187 symbol local. 1188 1189 If on the other hand, we are creating an executable, we 1190 may need to keep relocations for symbols satisfied by a 1191 dynamic library if we manage to avoid copy relocs for the 1192 symbol. */ 1193 if ((info->shared 1194 && (sec->flags & SEC_ALLOC) != 0 1195 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 1196 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL 1197 && ELF64_R_TYPE (rel->r_info) != R_390_PC32 1198 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL 1199 && ELF64_R_TYPE (rel->r_info) != R_390_PC64) 1200 || (h != NULL 1201 && (! info->symbolic 1202 || h->root.type == bfd_link_hash_defweak 1203 || (h->elf_link_hash_flags 1204 & ELF_LINK_HASH_DEF_REGULAR) == 0)))) 1205 || (ELIMINATE_COPY_RELOCS 1206 && !info->shared 1207 && (sec->flags & SEC_ALLOC) != 0 1208 && h != NULL 1209 && (h->root.type == bfd_link_hash_defweak 1210 || (h->elf_link_hash_flags 1211 & ELF_LINK_HASH_DEF_REGULAR) == 0))) 1212 { 1213 struct elf_s390_dyn_relocs *p; 1214 struct elf_s390_dyn_relocs **head; 1215 1216 /* We must copy these reloc types into the output file. 1217 Create a reloc section in dynobj and make room for 1218 this reloc. */ 1219 if (sreloc == NULL) 1220 { 1221 const char *name; 1222 bfd *dynobj; 1223 1224 name = (bfd_elf_string_from_elf_section 1225 (abfd, 1226 elf_elfheader (abfd)->e_shstrndx, 1227 elf_section_data (sec)->rel_hdr.sh_name)); 1228 if (name == NULL) 1229 return FALSE; 1230 1231 if (strncmp (name, ".rela", 5) != 0 1232 || strcmp (bfd_get_section_name (abfd, sec), 1233 name + 5) != 0) 1234 { 1235 (*_bfd_error_handler) 1236 (_("%s: bad relocation section name `%s\'"), 1237 bfd_archive_filename (abfd), name); 1238 } 1239 1240 if (htab->elf.dynobj == NULL) 1241 htab->elf.dynobj = abfd; 1242 1243 dynobj = htab->elf.dynobj; 1244 sreloc = bfd_get_section_by_name (dynobj, name); 1245 if (sreloc == NULL) 1246 { 1247 flagword flags; 1248 1249 sreloc = bfd_make_section (dynobj, name); 1250 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1251 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1252 if ((sec->flags & SEC_ALLOC) != 0) 1253 flags |= SEC_ALLOC | SEC_LOAD; 1254 if (sreloc == NULL 1255 || ! bfd_set_section_flags (dynobj, sreloc, flags) 1256 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 1257 return FALSE; 1258 } 1259 elf_section_data (sec)->sreloc = sreloc; 1260 } 1261 1262 /* If this is a global symbol, we count the number of 1263 relocations we need for this symbol. */ 1264 if (h != NULL) 1265 { 1266 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1267 } 1268 else 1269 { 1270 /* Track dynamic relocs needed for local syms too. 1271 We really need local syms available to do this 1272 easily. Oh well. */ 1273 1274 asection *s; 1275 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1276 sec, r_symndx); 1277 if (s == NULL) 1278 return FALSE; 1279 1280 head = ((struct elf_s390_dyn_relocs **) 1281 &elf_section_data (s)->local_dynrel); 1282 } 1283 1284 p = *head; 1285 if (p == NULL || p->sec != sec) 1286 { 1287 bfd_size_type amt = sizeof *p; 1288 p = ((struct elf_s390_dyn_relocs *) 1289 bfd_alloc (htab->elf.dynobj, amt)); 1290 if (p == NULL) 1291 return FALSE; 1292 p->next = *head; 1293 *head = p; 1294 p->sec = sec; 1295 p->count = 0; 1296 p->pc_count = 0; 1297 } 1298 1299 p->count += 1; 1300 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 1301 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1302 || ELF64_R_TYPE (rel->r_info) == R_390_PC32 1303 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL 1304 || ELF64_R_TYPE (rel->r_info) == R_390_PC64) 1305 p->pc_count += 1; 1306 } 1307 break; 1308 1309 /* This relocation describes the C++ object vtable hierarchy. 1310 Reconstruct it for later use during GC. */ 1311 case R_390_GNU_VTINHERIT: 1312 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1313 return FALSE; 1314 break; 1315 1316 /* This relocation describes which C++ vtable entries are actually 1317 used. Record for later use during GC. */ 1318 case R_390_GNU_VTENTRY: 1319 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1320 return FALSE; 1321 break; 1322 1323 default: 1324 break; 1325 } 1326 } 1327 1328 return TRUE; 1329} 1330 1331/* Return the section that should be marked against GC for a given 1332 relocation. */ 1333 1334static asection * 1335elf_s390_gc_mark_hook (sec, info, rel, h, sym) 1336 asection *sec; 1337 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1338 Elf_Internal_Rela *rel; 1339 struct elf_link_hash_entry *h; 1340 Elf_Internal_Sym *sym; 1341{ 1342 if (h != NULL) 1343 { 1344 switch (ELF64_R_TYPE (rel->r_info)) 1345 { 1346 case R_390_GNU_VTINHERIT: 1347 case R_390_GNU_VTENTRY: 1348 break; 1349 1350 default: 1351 switch (h->root.type) 1352 { 1353 case bfd_link_hash_defined: 1354 case bfd_link_hash_defweak: 1355 return h->root.u.def.section; 1356 1357 case bfd_link_hash_common: 1358 return h->root.u.c.p->section; 1359 1360 default: 1361 break; 1362 } 1363 } 1364 } 1365 else 1366 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 1367 1368 return NULL; 1369} 1370 1371/* Update the got entry reference counts for the section being removed. */ 1372 1373static bfd_boolean 1374elf_s390_gc_sweep_hook (abfd, info, sec, relocs) 1375 bfd *abfd; 1376 struct bfd_link_info *info; 1377 asection *sec; 1378 const Elf_Internal_Rela *relocs; 1379{ 1380 Elf_Internal_Shdr *symtab_hdr; 1381 struct elf_link_hash_entry **sym_hashes; 1382 bfd_signed_vma *local_got_refcounts; 1383 const Elf_Internal_Rela *rel, *relend; 1384 1385 elf_section_data (sec)->local_dynrel = NULL; 1386 1387 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1388 sym_hashes = elf_sym_hashes (abfd); 1389 local_got_refcounts = elf_local_got_refcounts (abfd); 1390 1391 relend = relocs + sec->reloc_count; 1392 for (rel = relocs; rel < relend; rel++) 1393 { 1394 unsigned long r_symndx; 1395 unsigned int r_type; 1396 struct elf_link_hash_entry *h = NULL; 1397 1398 r_symndx = ELF64_R_SYM (rel->r_info); 1399 if (r_symndx >= symtab_hdr->sh_info) 1400 { 1401 struct elf_s390_link_hash_entry *eh; 1402 struct elf_s390_dyn_relocs **pp; 1403 struct elf_s390_dyn_relocs *p; 1404 1405 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1406 eh = (struct elf_s390_link_hash_entry *) h; 1407 1408 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1409 if (p->sec == sec) 1410 { 1411 /* Everything must go for SEC. */ 1412 *pp = p->next; 1413 break; 1414 } 1415 } 1416 1417 r_type = ELF64_R_TYPE (rel->r_info); 1418 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1419 switch (r_type) 1420 { 1421 case R_390_TLS_LDM64: 1422 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1423 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1424 break; 1425 1426 case R_390_TLS_GD64: 1427 case R_390_TLS_IE64: 1428 case R_390_TLS_GOTIE12: 1429 case R_390_TLS_GOTIE20: 1430 case R_390_TLS_GOTIE64: 1431 case R_390_TLS_IEENT: 1432 case R_390_GOT12: 1433 case R_390_GOT16: 1434 case R_390_GOT20: 1435 case R_390_GOT32: 1436 case R_390_GOT64: 1437 case R_390_GOTOFF16: 1438 case R_390_GOTOFF32: 1439 case R_390_GOTOFF64: 1440 case R_390_GOTPC: 1441 case R_390_GOTPCDBL: 1442 case R_390_GOTENT: 1443 if (h != NULL) 1444 { 1445 if (h->got.refcount > 0) 1446 h->got.refcount -= 1; 1447 } 1448 else if (local_got_refcounts != NULL) 1449 { 1450 if (local_got_refcounts[r_symndx] > 0) 1451 local_got_refcounts[r_symndx] -= 1; 1452 } 1453 break; 1454 1455 case R_390_8: 1456 case R_390_12: 1457 case R_390_16: 1458 case R_390_20: 1459 case R_390_32: 1460 case R_390_64: 1461 case R_390_PC16: 1462 case R_390_PC16DBL: 1463 case R_390_PC32: 1464 case R_390_PC32DBL: 1465 case R_390_PC64: 1466 if (info->shared) 1467 break; 1468 /* Fall through */ 1469 1470 case R_390_PLT16DBL: 1471 case R_390_PLT32: 1472 case R_390_PLT32DBL: 1473 case R_390_PLT64: 1474 case R_390_PLTOFF16: 1475 case R_390_PLTOFF32: 1476 case R_390_PLTOFF64: 1477 if (h != NULL) 1478 { 1479 if (h->plt.refcount > 0) 1480 h->plt.refcount -= 1; 1481 } 1482 break; 1483 1484 case R_390_GOTPLT12: 1485 case R_390_GOTPLT16: 1486 case R_390_GOTPLT20: 1487 case R_390_GOTPLT32: 1488 case R_390_GOTPLT64: 1489 case R_390_GOTPLTENT: 1490 if (h != NULL) 1491 { 1492 if (h->plt.refcount > 0) 1493 { 1494 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1495 h->plt.refcount -= 1; 1496 } 1497 } 1498 else if (local_got_refcounts != NULL) 1499 { 1500 if (local_got_refcounts[r_symndx] > 0) 1501 local_got_refcounts[r_symndx] -= 1; 1502 } 1503 break; 1504 1505 default: 1506 break; 1507 } 1508 } 1509 1510 return TRUE; 1511} 1512 1513/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1514 entry but we found we will not create any. Called when we find we will 1515 not have any PLT for this symbol, by for example 1516 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1517 or elf_s390_size_dynamic_sections if no dynamic sections will be 1518 created (we're only linking static objects). */ 1519 1520static void 1521elf_s390_adjust_gotplt (h) 1522 struct elf_s390_link_hash_entry *h; 1523{ 1524 if (h->elf.root.type == bfd_link_hash_warning) 1525 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1526 1527 if (h->gotplt_refcount <= 0) 1528 return; 1529 1530 /* We simply add the number of gotplt references to the number 1531 * of got references for this symbol. */ 1532 h->elf.got.refcount += h->gotplt_refcount; 1533 h->gotplt_refcount = -1; 1534} 1535 1536/* Adjust a symbol defined by a dynamic object and referenced by a 1537 regular object. The current definition is in some section of the 1538 dynamic object, but we're not including those sections. We have to 1539 change the definition to something the rest of the link can 1540 understand. */ 1541 1542static bfd_boolean 1543elf_s390_adjust_dynamic_symbol (info, h) 1544 struct bfd_link_info *info; 1545 struct elf_link_hash_entry *h; 1546{ 1547 struct elf_s390_link_hash_table *htab; 1548 asection *s; 1549 unsigned int power_of_two; 1550 1551 /* If this is a function, put it in the procedure linkage table. We 1552 will fill in the contents of the procedure linkage table later 1553 (although we could actually do it here). */ 1554 if (h->type == STT_FUNC 1555 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) 1556 { 1557 if (h->plt.refcount <= 0 1558 || (! info->shared 1559 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 1560 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 1561 && h->root.type != bfd_link_hash_undefweak 1562 && h->root.type != bfd_link_hash_undefined)) 1563 { 1564 /* This case can occur if we saw a PLT32 reloc in an input 1565 file, but the symbol was never referred to by a dynamic 1566 object, or if all references were garbage collected. In 1567 such a case, we don't actually need to build a procedure 1568 linkage table, and we can just do a PC32 reloc instead. */ 1569 h->plt.offset = (bfd_vma) -1; 1570 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1571 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1572 } 1573 1574 return TRUE; 1575 } 1576 else 1577 /* It's possible that we incorrectly decided a .plt reloc was 1578 needed for an R_390_PC32 reloc to a non-function sym in 1579 check_relocs. We can't decide accurately between function and 1580 non-function syms in check-relocs; Objects loaded later in 1581 the link may change h->type. So fix it now. */ 1582 h->plt.offset = (bfd_vma) -1; 1583 1584 /* If this is a weak symbol, and there is a real definition, the 1585 processor independent code will have arranged for us to see the 1586 real definition first, and we can just use the same value. */ 1587 if (h->weakdef != NULL) 1588 { 1589 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined 1590 || h->weakdef->root.type == bfd_link_hash_defweak); 1591 h->root.u.def.section = h->weakdef->root.u.def.section; 1592 h->root.u.def.value = h->weakdef->root.u.def.value; 1593 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1594 h->elf_link_hash_flags 1595 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF) 1596 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF)); 1597 return TRUE; 1598 } 1599 1600 /* This is a reference to a symbol defined by a dynamic object which 1601 is not a function. */ 1602 1603 /* If we are creating a shared library, we must presume that the 1604 only references to the symbol are via the global offset table. 1605 For such cases we need not do anything here; the relocations will 1606 be handled correctly by relocate_section. */ 1607 if (info->shared) 1608 return TRUE; 1609 1610 /* If there are no references to this symbol that do not use the 1611 GOT, we don't need to generate a copy reloc. */ 1612 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) 1613 return TRUE; 1614 1615 /* If -z nocopyreloc was given, we won't generate them either. */ 1616 if (info->nocopyreloc) 1617 { 1618 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; 1619 return TRUE; 1620 } 1621 1622 if (ELIMINATE_COPY_RELOCS) 1623 { 1624 struct elf_s390_link_hash_entry * eh; 1625 struct elf_s390_dyn_relocs *p; 1626 1627 eh = (struct elf_s390_link_hash_entry *) h; 1628 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1629 { 1630 s = p->sec->output_section; 1631 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1632 break; 1633 } 1634 1635 /* If we didn't find any dynamic relocs in read-only sections, then 1636 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1637 if (p == NULL) 1638 { 1639 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; 1640 return TRUE; 1641 } 1642 } 1643 1644 /* We must allocate the symbol in our .dynbss section, which will 1645 become part of the .bss section of the executable. There will be 1646 an entry for this symbol in the .dynsym section. The dynamic 1647 object will contain position independent code, so all references 1648 from the dynamic object to this symbol will go through the global 1649 offset table. The dynamic linker will use the .dynsym entry to 1650 determine the address it must put in the global offset table, so 1651 both the dynamic object and the regular object will refer to the 1652 same memory location for the variable. */ 1653 1654 htab = elf_s390_hash_table (info); 1655 1656 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1657 copy the initial value out of the dynamic object and into the 1658 runtime process image. */ 1659 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1660 { 1661 htab->srelbss->_raw_size += sizeof (Elf64_External_Rela); 1662 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; 1663 } 1664 1665 /* We need to figure out the alignment required for this symbol. I 1666 have no idea how ELF linkers handle this. */ 1667 power_of_two = bfd_log2 (h->size); 1668 if (power_of_two > 3) 1669 power_of_two = 3; 1670 1671 /* Apply the required alignment. */ 1672 s = htab->sdynbss; 1673 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); 1674 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1675 { 1676 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1677 return FALSE; 1678 } 1679 1680 /* Define the symbol as being at this point in the section. */ 1681 h->root.u.def.section = s; 1682 h->root.u.def.value = s->_raw_size; 1683 1684 /* Increment the section size to make room for the symbol. */ 1685 s->_raw_size += h->size; 1686 1687 return TRUE; 1688} 1689 1690/* Allocate space in .plt, .got and associated reloc sections for 1691 dynamic relocs. */ 1692 1693static bfd_boolean 1694allocate_dynrelocs (h, inf) 1695 struct elf_link_hash_entry *h; 1696 PTR inf; 1697{ 1698 struct bfd_link_info *info; 1699 struct elf_s390_link_hash_table *htab; 1700 struct elf_s390_link_hash_entry *eh; 1701 struct elf_s390_dyn_relocs *p; 1702 1703 if (h->root.type == bfd_link_hash_indirect) 1704 return TRUE; 1705 1706 if (h->root.type == bfd_link_hash_warning) 1707 /* When warning symbols are created, they **replace** the "real" 1708 entry in the hash table, thus we never get to see the real 1709 symbol in a hash traversal. So look at it now. */ 1710 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1711 1712 info = (struct bfd_link_info *) inf; 1713 htab = elf_s390_hash_table (info); 1714 1715 if (htab->elf.dynamic_sections_created 1716 && h->plt.refcount > 0 1717 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1718 || h->root.type != bfd_link_hash_undefweak)) 1719 { 1720 /* Make sure this symbol is output as a dynamic symbol. 1721 Undefined weak syms won't yet be marked as dynamic. */ 1722 if (h->dynindx == -1 1723 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1724 { 1725 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1726 return FALSE; 1727 } 1728 1729 if (info->shared 1730 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1731 { 1732 asection *s = htab->splt; 1733 1734 /* If this is the first .plt entry, make room for the special 1735 first entry. */ 1736 if (s->_raw_size == 0) 1737 s->_raw_size += PLT_FIRST_ENTRY_SIZE; 1738 1739 h->plt.offset = s->_raw_size; 1740 1741 /* If this symbol is not defined in a regular file, and we are 1742 not generating a shared library, then set the symbol to this 1743 location in the .plt. This is required to make function 1744 pointers compare as equal between the normal executable and 1745 the shared library. */ 1746 if (! info->shared 1747 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1748 { 1749 h->root.u.def.section = s; 1750 h->root.u.def.value = h->plt.offset; 1751 } 1752 1753 /* Make room for this entry. */ 1754 s->_raw_size += PLT_ENTRY_SIZE; 1755 1756 /* We also need to make an entry in the .got.plt section, which 1757 will be placed in the .got section by the linker script. */ 1758 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE; 1759 1760 /* We also need to make an entry in the .rela.plt section. */ 1761 htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); 1762 } 1763 else 1764 { 1765 h->plt.offset = (bfd_vma) -1; 1766 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1767 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1768 } 1769 } 1770 else 1771 { 1772 h->plt.offset = (bfd_vma) -1; 1773 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1774 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1775 } 1776 1777 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to 1778 the binary, we can optimize a bit. IE64 and GOTIE64 get converted 1779 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT 1780 we can save the dynamic TLS relocation. */ 1781 if (h->got.refcount > 0 1782 && !info->shared 1783 && h->dynindx == -1 1784 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1785 { 1786 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1787 /* For the GOTIE access without a literal pool entry the offset has 1788 to be stored somewhere. The immediate value in the instruction 1789 is not bit enough so the value is stored in the got. */ 1790 { 1791 h->got.offset = htab->sgot->_raw_size; 1792 htab->sgot->_raw_size += GOT_ENTRY_SIZE; 1793 } 1794 else 1795 h->got.offset = (bfd_vma) -1; 1796 } 1797 else if (h->got.refcount > 0) 1798 { 1799 asection *s; 1800 bfd_boolean dyn; 1801 int tls_type = elf_s390_hash_entry(h)->tls_type; 1802 1803 /* Make sure this symbol is output as a dynamic symbol. 1804 Undefined weak syms won't yet be marked as dynamic. */ 1805 if (h->dynindx == -1 1806 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1807 { 1808 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1809 return FALSE; 1810 } 1811 1812 s = htab->sgot; 1813 h->got.offset = s->_raw_size; 1814 s->_raw_size += GOT_ENTRY_SIZE; 1815 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */ 1816 if (tls_type == GOT_TLS_GD) 1817 s->_raw_size += GOT_ENTRY_SIZE; 1818 dyn = htab->elf.dynamic_sections_created; 1819 /* R_390_TLS_IE64 needs one dynamic relocation, 1820 R_390_TLS_GD64 needs one if local symbol and two if global. */ 1821 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1822 || tls_type >= GOT_TLS_IE) 1823 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); 1824 else if (tls_type == GOT_TLS_GD) 1825 htab->srelgot->_raw_size += 2 * sizeof (Elf64_External_Rela); 1826 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1827 || h->root.type != bfd_link_hash_undefweak) 1828 && (info->shared 1829 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1830 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); 1831 } 1832 else 1833 h->got.offset = (bfd_vma) -1; 1834 1835 eh = (struct elf_s390_link_hash_entry *) h; 1836 if (eh->dyn_relocs == NULL) 1837 return TRUE; 1838 1839 /* In the shared -Bsymbolic case, discard space allocated for 1840 dynamic pc-relative relocs against symbols which turn out to be 1841 defined in regular objects. For the normal shared case, discard 1842 space for pc-relative relocs that have become local due to symbol 1843 visibility changes. */ 1844 1845 if (info->shared) 1846 { 1847 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1848 { 1849 struct elf_s390_dyn_relocs **pp; 1850 1851 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1852 { 1853 p->count -= p->pc_count; 1854 p->pc_count = 0; 1855 if (p->count == 0) 1856 *pp = p->next; 1857 else 1858 pp = &p->next; 1859 } 1860 } 1861 1862 /* Also discard relocs on undefined weak syms with non-default 1863 visibility. */ 1864 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1865 && h->root.type == bfd_link_hash_undefweak) 1866 eh->dyn_relocs = NULL; 1867 } 1868 else if (ELIMINATE_COPY_RELOCS) 1869 { 1870 /* For the non-shared case, discard space for relocs against 1871 symbols which turn out to need copy relocs or are not 1872 dynamic. */ 1873 1874 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 1875 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 1876 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1877 || (htab->elf.dynamic_sections_created 1878 && (h->root.type == bfd_link_hash_undefweak 1879 || h->root.type == bfd_link_hash_undefined)))) 1880 { 1881 /* Make sure this symbol is output as a dynamic symbol. 1882 Undefined weak syms won't yet be marked as dynamic. */ 1883 if (h->dynindx == -1 1884 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1885 { 1886 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1887 return FALSE; 1888 } 1889 1890 /* If that succeeded, we know we'll be keeping all the 1891 relocs. */ 1892 if (h->dynindx != -1) 1893 goto keep; 1894 } 1895 1896 eh->dyn_relocs = NULL; 1897 1898 keep: ; 1899 } 1900 1901 /* Finally, allocate space. */ 1902 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1903 { 1904 asection *sreloc = elf_section_data (p->sec)->sreloc; 1905 sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); 1906 } 1907 1908 return TRUE; 1909} 1910 1911/* Find any dynamic relocs that apply to read-only sections. */ 1912 1913static bfd_boolean 1914readonly_dynrelocs (h, inf) 1915 struct elf_link_hash_entry *h; 1916 PTR inf; 1917{ 1918 struct elf_s390_link_hash_entry *eh; 1919 struct elf_s390_dyn_relocs *p; 1920 1921 if (h->root.type == bfd_link_hash_warning) 1922 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1923 1924 eh = (struct elf_s390_link_hash_entry *) h; 1925 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1926 { 1927 asection *s = p->sec->output_section; 1928 1929 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1930 { 1931 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1932 1933 info->flags |= DF_TEXTREL; 1934 1935 /* Not an error, just cut short the traversal. */ 1936 return FALSE; 1937 } 1938 } 1939 return TRUE; 1940} 1941 1942/* Set the sizes of the dynamic sections. */ 1943 1944static bfd_boolean 1945elf_s390_size_dynamic_sections (output_bfd, info) 1946 bfd *output_bfd ATTRIBUTE_UNUSED; 1947 struct bfd_link_info *info; 1948{ 1949 struct elf_s390_link_hash_table *htab; 1950 bfd *dynobj; 1951 asection *s; 1952 bfd_boolean relocs; 1953 bfd *ibfd; 1954 1955 htab = elf_s390_hash_table (info); 1956 dynobj = htab->elf.dynobj; 1957 if (dynobj == NULL) 1958 abort (); 1959 1960 if (htab->elf.dynamic_sections_created) 1961 { 1962 /* Set the contents of the .interp section to the interpreter. */ 1963 if (info->executable) 1964 { 1965 s = bfd_get_section_by_name (dynobj, ".interp"); 1966 if (s == NULL) 1967 abort (); 1968 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; 1969 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1970 } 1971 } 1972 1973 /* Set up .got offsets for local syms, and space for local dynamic 1974 relocs. */ 1975 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 1976 { 1977 bfd_signed_vma *local_got; 1978 bfd_signed_vma *end_local_got; 1979 char *local_tls_type; 1980 bfd_size_type locsymcount; 1981 Elf_Internal_Shdr *symtab_hdr; 1982 asection *srela; 1983 1984 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 1985 continue; 1986 1987 for (s = ibfd->sections; s != NULL; s = s->next) 1988 { 1989 struct elf_s390_dyn_relocs *p; 1990 1991 for (p = *((struct elf_s390_dyn_relocs **) 1992 &elf_section_data (s)->local_dynrel); 1993 p != NULL; 1994 p = p->next) 1995 { 1996 if (!bfd_is_abs_section (p->sec) 1997 && bfd_is_abs_section (p->sec->output_section)) 1998 { 1999 /* Input section has been discarded, either because 2000 it is a copy of a linkonce section or due to 2001 linker script /DISCARD/, so we'll be discarding 2002 the relocs too. */ 2003 } 2004 else if (p->count != 0) 2005 { 2006 srela = elf_section_data (p->sec)->sreloc; 2007 srela->_raw_size += p->count * sizeof (Elf64_External_Rela); 2008 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2009 info->flags |= DF_TEXTREL; 2010 } 2011 } 2012 } 2013 2014 local_got = elf_local_got_refcounts (ibfd); 2015 if (!local_got) 2016 continue; 2017 2018 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2019 locsymcount = symtab_hdr->sh_info; 2020 end_local_got = local_got + locsymcount; 2021 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2022 s = htab->sgot; 2023 srela = htab->srelgot; 2024 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2025 { 2026 if (*local_got > 0) 2027 { 2028 *local_got = s->_raw_size; 2029 s->_raw_size += GOT_ENTRY_SIZE; 2030 if (*local_tls_type == GOT_TLS_GD) 2031 s->_raw_size += GOT_ENTRY_SIZE; 2032 if (info->shared) 2033 srela->_raw_size += sizeof (Elf64_External_Rela); 2034 } 2035 else 2036 *local_got = (bfd_vma) -1; 2037 } 2038 } 2039 2040 if (htab->tls_ldm_got.refcount > 0) 2041 { 2042 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64 2043 relocs. */ 2044 htab->tls_ldm_got.offset = htab->sgot->_raw_size; 2045 htab->sgot->_raw_size += 2 * GOT_ENTRY_SIZE; 2046 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); 2047 } 2048 else 2049 htab->tls_ldm_got.offset = -1; 2050 2051 /* Allocate global sym .plt and .got entries, and space for global 2052 sym dynamic relocs. */ 2053 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 2054 2055 /* We now have determined the sizes of the various dynamic sections. 2056 Allocate memory for them. */ 2057 relocs = FALSE; 2058 for (s = dynobj->sections; s != NULL; s = s->next) 2059 { 2060 if ((s->flags & SEC_LINKER_CREATED) == 0) 2061 continue; 2062 2063 if (s == htab->splt 2064 || s == htab->sgot 2065 || s == htab->sgotplt) 2066 { 2067 /* Strip this section if we don't need it; see the 2068 comment below. */ 2069 } 2070 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) 2071 { 2072 if (s->_raw_size != 0 && s != htab->srelplt) 2073 relocs = TRUE; 2074 2075 /* We use the reloc_count field as a counter if we need 2076 to copy relocs into the output file. */ 2077 s->reloc_count = 0; 2078 } 2079 else 2080 { 2081 /* It's not one of our sections, so don't allocate space. */ 2082 continue; 2083 } 2084 2085 if (s->_raw_size == 0) 2086 { 2087 /* If we don't need this section, strip it from the 2088 output file. This is to handle .rela.bss and 2089 .rela.plt. We must create it in 2090 create_dynamic_sections, because it must be created 2091 before the linker maps input sections to output 2092 sections. The linker does that before 2093 adjust_dynamic_symbol is called, and it is that 2094 function which decides whether anything needs to go 2095 into these sections. */ 2096 2097 _bfd_strip_section_from_output (info, s); 2098 continue; 2099 } 2100 2101 /* Allocate memory for the section contents. We use bfd_zalloc 2102 here in case unused entries are not reclaimed before the 2103 section's contents are written out. This should not happen, 2104 but this way if it does, we get a R_390_NONE reloc instead 2105 of garbage. */ 2106 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); 2107 if (s->contents == NULL) 2108 return FALSE; 2109 } 2110 2111 if (htab->elf.dynamic_sections_created) 2112 { 2113 /* Add some entries to the .dynamic section. We fill in the 2114 values later, in elf_s390_finish_dynamic_sections, but we 2115 must add the entries now so that we get the correct size for 2116 the .dynamic section. The DT_DEBUG entry is filled in by the 2117 dynamic linker and used by the debugger. */ 2118#define add_dynamic_entry(TAG, VAL) \ 2119 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2120 2121 if (info->executable) 2122 { 2123 if (!add_dynamic_entry (DT_DEBUG, 0)) 2124 return FALSE; 2125 } 2126 2127 if (htab->splt->_raw_size != 0) 2128 { 2129 if (!add_dynamic_entry (DT_PLTGOT, 0) 2130 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2131 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2132 || !add_dynamic_entry (DT_JMPREL, 0)) 2133 return FALSE; 2134 } 2135 2136 if (relocs) 2137 { 2138 if (!add_dynamic_entry (DT_RELA, 0) 2139 || !add_dynamic_entry (DT_RELASZ, 0) 2140 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 2141 return FALSE; 2142 2143 /* If any dynamic relocs apply to a read-only section, 2144 then we need a DT_TEXTREL entry. */ 2145 if ((info->flags & DF_TEXTREL) == 0) 2146 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2147 (PTR) info); 2148 2149 if ((info->flags & DF_TEXTREL) != 0) 2150 { 2151 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2152 return FALSE; 2153 } 2154 } 2155 } 2156#undef add_dynamic_entry 2157 2158 return TRUE; 2159} 2160 2161/* Return the base VMA address which should be subtracted from real addresses 2162 when resolving @dtpoff relocation. 2163 This is PT_TLS segment p_vaddr. */ 2164 2165static bfd_vma 2166dtpoff_base (info) 2167 struct bfd_link_info *info; 2168{ 2169 /* If tls_sec is NULL, we should have signalled an error already. */ 2170 if (elf_hash_table (info)->tls_sec == NULL) 2171 return 0; 2172 return elf_hash_table (info)->tls_sec->vma; 2173} 2174 2175/* Return the relocation value for @tpoff relocation 2176 if STT_TLS virtual address is ADDRESS. */ 2177 2178static bfd_vma 2179tpoff (info, address) 2180 struct bfd_link_info *info; 2181 bfd_vma address; 2182{ 2183 struct elf_link_hash_table *htab = elf_hash_table (info); 2184 2185 /* If tls_sec is NULL, we should have signalled an error already. */ 2186 if (htab->tls_sec == NULL) 2187 return 0; 2188 return htab->tls_size + htab->tls_sec->vma - address; 2189} 2190 2191/* Complain if TLS instruction relocation is against an invalid 2192 instruction. */ 2193 2194static void 2195invalid_tls_insn (input_bfd, input_section, rel) 2196 bfd *input_bfd; 2197 asection *input_section; 2198 Elf_Internal_Rela *rel; 2199{ 2200 reloc_howto_type *howto; 2201 2202 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info); 2203 (*_bfd_error_handler) 2204 (_("%s(%s+0x%lx): invalid instruction for TLS relocation %s"), 2205 bfd_archive_filename (input_bfd), 2206 bfd_get_section_name (input_bfd, input_section), 2207 (long) rel->r_offset, 2208 howto->name); 2209} 2210 2211/* Relocate a 390 ELF section. */ 2212 2213static bfd_boolean 2214elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, 2215 contents, relocs, local_syms, local_sections) 2216 bfd *output_bfd; 2217 struct bfd_link_info *info; 2218 bfd *input_bfd; 2219 asection *input_section; 2220 bfd_byte *contents; 2221 Elf_Internal_Rela *relocs; 2222 Elf_Internal_Sym *local_syms; 2223 asection **local_sections; 2224{ 2225 struct elf_s390_link_hash_table *htab; 2226 Elf_Internal_Shdr *symtab_hdr; 2227 struct elf_link_hash_entry **sym_hashes; 2228 bfd_vma *local_got_offsets; 2229 Elf_Internal_Rela *rel; 2230 Elf_Internal_Rela *relend; 2231 2232 if (info->relocatable) 2233 return TRUE; 2234 2235 htab = elf_s390_hash_table (info); 2236 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2237 sym_hashes = elf_sym_hashes (input_bfd); 2238 local_got_offsets = elf_local_got_offsets (input_bfd); 2239 2240 rel = relocs; 2241 relend = relocs + input_section->reloc_count; 2242 for (; rel < relend; rel++) 2243 { 2244 unsigned int r_type; 2245 reloc_howto_type *howto; 2246 unsigned long r_symndx; 2247 struct elf_link_hash_entry *h; 2248 Elf_Internal_Sym *sym; 2249 asection *sec; 2250 bfd_vma off; 2251 bfd_vma relocation; 2252 bfd_boolean unresolved_reloc; 2253 bfd_reloc_status_type r; 2254 int tls_type; 2255 2256 r_type = ELF64_R_TYPE (rel->r_info); 2257 if (r_type == (int) R_390_GNU_VTINHERIT 2258 || r_type == (int) R_390_GNU_VTENTRY) 2259 continue; 2260 if (r_type >= (int) R_390_max) 2261 { 2262 bfd_set_error (bfd_error_bad_value); 2263 return FALSE; 2264 } 2265 2266 howto = elf_howto_table + r_type; 2267 r_symndx = ELF64_R_SYM (rel->r_info); 2268 2269 /* This is a final link. */ 2270 h = NULL; 2271 sym = NULL; 2272 sec = NULL; 2273 unresolved_reloc = FALSE; 2274 if (r_symndx < symtab_hdr->sh_info) 2275 { 2276 sym = local_syms + r_symndx; 2277 sec = local_sections[r_symndx]; 2278 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2279 } 2280 else 2281 { 2282 bfd_boolean warned ATTRIBUTE_UNUSED; 2283 2284 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2285 r_symndx, symtab_hdr, sym_hashes, 2286 h, sec, relocation, 2287 unresolved_reloc, warned); 2288 } 2289 2290 switch (r_type) 2291 { 2292 case R_390_GOTPLT12: 2293 case R_390_GOTPLT16: 2294 case R_390_GOTPLT20: 2295 case R_390_GOTPLT32: 2296 case R_390_GOTPLT64: 2297 case R_390_GOTPLTENT: 2298 /* There are three cases for a GOTPLT relocation. 1) The 2299 relocation is against the jump slot entry of a plt that 2300 will get emitted to the output file. 2) The relocation 2301 is against the jump slot of a plt entry that has been 2302 removed. elf_s390_adjust_gotplt has created a GOT entry 2303 as replacement. 3) The relocation is against a local symbol. 2304 Cases 2) and 3) are the same as the GOT relocation code 2305 so we just have to test for case 1 and fall through for 2306 the other two. */ 2307 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2308 { 2309 bfd_vma plt_index; 2310 2311 /* Calc. index no. 2312 Current offset - size first entry / entry size. */ 2313 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2314 PLT_ENTRY_SIZE; 2315 2316 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 2317 addr & GOT addr. */ 2318 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2319 unresolved_reloc = FALSE; 2320 2321 if (r_type == R_390_GOTPLTENT) 2322 relocation += htab->sgot->output_section->vma; 2323 break; 2324 } 2325 /* Fall through. */ 2326 2327 case R_390_GOT12: 2328 case R_390_GOT16: 2329 case R_390_GOT20: 2330 case R_390_GOT32: 2331 case R_390_GOT64: 2332 case R_390_GOTENT: 2333 /* Relocation is to the entry for this symbol in the global 2334 offset table. */ 2335 if (htab->sgot == NULL) 2336 abort (); 2337 2338 if (h != NULL) 2339 { 2340 bfd_boolean dyn; 2341 2342 off = h->got.offset; 2343 dyn = htab->elf.dynamic_sections_created; 2344 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2345 || (info->shared 2346 && (info->symbolic 2347 || h->dynindx == -1 2348 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) 2349 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) 2350 || (ELF_ST_VISIBILITY (h->other) 2351 && h->root.type == bfd_link_hash_undefweak)) 2352 { 2353 /* This is actually a static link, or it is a 2354 -Bsymbolic link and the symbol is defined 2355 locally, or the symbol was forced to be local 2356 because of a version file. We must initialize 2357 this entry in the global offset table. Since the 2358 offset must always be a multiple of 2, we use the 2359 least significant bit to record whether we have 2360 initialized it already. 2361 2362 When doing a dynamic link, we create a .rel.got 2363 relocation entry to initialize the value. This 2364 is done in the finish_dynamic_symbol routine. */ 2365 if ((off & 1) != 0) 2366 off &= ~1; 2367 else 2368 { 2369 bfd_put_64 (output_bfd, relocation, 2370 htab->sgot->contents + off); 2371 h->got.offset |= 1; 2372 } 2373 } 2374 else 2375 unresolved_reloc = FALSE; 2376 } 2377 else 2378 { 2379 if (local_got_offsets == NULL) 2380 abort (); 2381 2382 off = local_got_offsets[r_symndx]; 2383 2384 /* The offset must always be a multiple of 8. We use 2385 the least significant bit to record whether we have 2386 already generated the necessary reloc. */ 2387 if ((off & 1) != 0) 2388 off &= ~1; 2389 else 2390 { 2391 bfd_put_64 (output_bfd, relocation, 2392 htab->sgot->contents + off); 2393 2394 if (info->shared) 2395 { 2396 asection *s; 2397 Elf_Internal_Rela outrel; 2398 bfd_byte *loc; 2399 2400 s = htab->srelgot; 2401 if (s == NULL) 2402 abort (); 2403 2404 outrel.r_offset = (htab->sgot->output_section->vma 2405 + htab->sgot->output_offset 2406 + off); 2407 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2408 outrel.r_addend = relocation; 2409 loc = s->contents; 2410 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2411 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2412 } 2413 2414 local_got_offsets[r_symndx] |= 1; 2415 } 2416 } 2417 2418 if (off >= (bfd_vma) -2) 2419 abort (); 2420 2421 relocation = htab->sgot->output_offset + off; 2422 2423 /* For @GOTENT the relocation is against the offset between 2424 the instruction and the symbols entry in the GOT and not 2425 between the start of the GOT and the symbols entry. We 2426 add the vma of the GOT to get the correct value. */ 2427 if ( r_type == R_390_GOTENT 2428 || r_type == R_390_GOTPLTENT) 2429 relocation += htab->sgot->output_section->vma; 2430 2431 break; 2432 2433 case R_390_GOTOFF16: 2434 case R_390_GOTOFF32: 2435 case R_390_GOTOFF64: 2436 /* Relocation is relative to the start of the global offset 2437 table. */ 2438 2439 /* Note that sgot->output_offset is not involved in this 2440 calculation. We always want the start of .got. If we 2441 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2442 permitted by the ABI, we might have to change this 2443 calculation. */ 2444 relocation -= htab->sgot->output_section->vma; 2445 break; 2446 2447 case R_390_GOTPC: 2448 case R_390_GOTPCDBL: 2449 /* Use global offset table as symbol value. */ 2450 relocation = htab->sgot->output_section->vma; 2451 unresolved_reloc = FALSE; 2452 break; 2453 2454 case R_390_PLT16DBL: 2455 case R_390_PLT32: 2456 case R_390_PLT32DBL: 2457 case R_390_PLT64: 2458 /* Relocation is to the entry for this symbol in the 2459 procedure linkage table. */ 2460 2461 /* Resolve a PLT32 reloc against a local symbol directly, 2462 without using the procedure linkage table. */ 2463 if (h == NULL) 2464 break; 2465 2466 if (h->plt.offset == (bfd_vma) -1 2467 || htab->splt == NULL) 2468 { 2469 /* We didn't make a PLT entry for this symbol. This 2470 happens when statically linking PIC code, or when 2471 using -Bsymbolic. */ 2472 break; 2473 } 2474 2475 relocation = (htab->splt->output_section->vma 2476 + htab->splt->output_offset 2477 + h->plt.offset); 2478 unresolved_reloc = FALSE; 2479 break; 2480 2481 case R_390_PLTOFF16: 2482 case R_390_PLTOFF32: 2483 case R_390_PLTOFF64: 2484 /* Relocation is to the entry for this symbol in the 2485 procedure linkage table relative to the start of the GOT. */ 2486 2487 /* For local symbols or if we didn't make a PLT entry for 2488 this symbol resolve the symbol directly. */ 2489 if ( h == NULL 2490 || h->plt.offset == (bfd_vma) -1 2491 || htab->splt == NULL) 2492 { 2493 relocation -= htab->sgot->output_section->vma; 2494 break; 2495 } 2496 2497 relocation = (htab->splt->output_section->vma 2498 + htab->splt->output_offset 2499 + h->plt.offset 2500 - htab->sgot->output_section->vma); 2501 unresolved_reloc = FALSE; 2502 break; 2503 2504 case R_390_8: 2505 case R_390_16: 2506 case R_390_32: 2507 case R_390_64: 2508 case R_390_PC16: 2509 case R_390_PC16DBL: 2510 case R_390_PC32: 2511 case R_390_PC32DBL: 2512 case R_390_PC64: 2513 /* r_symndx will be zero only for relocs against symbols 2514 from removed linkonce sections, or sections discarded by 2515 a linker script. */ 2516 if (r_symndx == 0 2517 || (input_section->flags & SEC_ALLOC) == 0) 2518 break; 2519 2520 if ((info->shared 2521 && (h == NULL 2522 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2523 || h->root.type != bfd_link_hash_undefweak) 2524 && ((r_type != R_390_PC16 2525 && r_type != R_390_PC16DBL 2526 && r_type != R_390_PC32 2527 && r_type != R_390_PC32DBL 2528 && r_type != R_390_PC64) 2529 || (h != NULL 2530 && !SYMBOL_REFERENCES_LOCAL (info, h)))) 2531 || (ELIMINATE_COPY_RELOCS 2532 && !info->shared 2533 && h != NULL 2534 && h->dynindx != -1 2535 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 2536 && (((h->elf_link_hash_flags 2537 & ELF_LINK_HASH_DEF_DYNAMIC) != 0 2538 && (h->elf_link_hash_flags 2539 & ELF_LINK_HASH_DEF_REGULAR) == 0) 2540 || h->root.type == bfd_link_hash_undefweak 2541 || h->root.type == bfd_link_hash_undefined))) 2542 { 2543 Elf_Internal_Rela outrel; 2544 bfd_boolean skip, relocate; 2545 asection *sreloc; 2546 bfd_byte *loc; 2547 2548 /* When generating a shared object, these relocations 2549 are copied into the output file to be resolved at run 2550 time. */ 2551 skip = FALSE; 2552 relocate = FALSE; 2553 2554 outrel.r_offset = 2555 _bfd_elf_section_offset (output_bfd, info, input_section, 2556 rel->r_offset); 2557 if (outrel.r_offset == (bfd_vma) -1) 2558 skip = TRUE; 2559 else if (outrel.r_offset == (bfd_vma) -2) 2560 skip = TRUE, relocate = TRUE; 2561 2562 outrel.r_offset += (input_section->output_section->vma 2563 + input_section->output_offset); 2564 2565 if (skip) 2566 memset (&outrel, 0, sizeof outrel); 2567 else if (h != NULL 2568 && h->dynindx != -1 2569 && (r_type == R_390_PC16 2570 || r_type == R_390_PC16DBL 2571 || r_type == R_390_PC32 2572 || r_type == R_390_PC32DBL 2573 || r_type == R_390_PC64 2574 || !info->shared 2575 || !info->symbolic 2576 || (h->elf_link_hash_flags 2577 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 2578 { 2579 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2580 outrel.r_addend = rel->r_addend; 2581 } 2582 else 2583 { 2584 /* This symbol is local, or marked to become local. */ 2585 outrel.r_addend = relocation + rel->r_addend; 2586 if (r_type == R_390_64) 2587 { 2588 relocate = TRUE; 2589 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2590 } 2591 else 2592 { 2593 long sindx; 2594 2595 if (bfd_is_abs_section (sec)) 2596 sindx = 0; 2597 else if (sec == NULL || sec->owner == NULL) 2598 { 2599 bfd_set_error(bfd_error_bad_value); 2600 return FALSE; 2601 } 2602 else 2603 { 2604 asection *osec; 2605 2606 osec = sec->output_section; 2607 sindx = elf_section_data (osec)->dynindx; 2608 BFD_ASSERT (sindx > 0); 2609 2610 /* We are turning this relocation into one 2611 against a section symbol, so subtract out 2612 the output section's address but not the 2613 offset of the input section in the output 2614 section. */ 2615 2616 outrel.r_addend -= osec->vma; 2617 } 2618 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2619 } 2620 } 2621 2622 sreloc = elf_section_data (input_section)->sreloc; 2623 if (sreloc == NULL) 2624 abort (); 2625 2626 loc = sreloc->contents; 2627 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2628 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2629 2630 /* If this reloc is against an external symbol, we do 2631 not want to fiddle with the addend. Otherwise, we 2632 need to include the symbol value so that it becomes 2633 an addend for the dynamic reloc. */ 2634 if (! relocate) 2635 continue; 2636 } 2637 2638 break; 2639 2640 /* Relocations for tls literal pool entries. */ 2641 case R_390_TLS_IE64: 2642 if (info->shared) 2643 { 2644 Elf_Internal_Rela outrel; 2645 asection *sreloc; 2646 bfd_byte *loc; 2647 2648 outrel.r_offset = rel->r_offset 2649 + input_section->output_section->vma 2650 + input_section->output_offset; 2651 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2652 sreloc = elf_section_data (input_section)->sreloc; 2653 if (sreloc == NULL) 2654 abort (); 2655 loc = sreloc->contents; 2656 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2657 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc); 2658 } 2659 /* Fall through. */ 2660 2661 case R_390_TLS_GD64: 2662 case R_390_TLS_GOTIE64: 2663 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2664 tls_type = GOT_UNKNOWN; 2665 if (h == NULL && local_got_offsets) 2666 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2667 else if (h != NULL) 2668 { 2669 tls_type = elf_s390_hash_entry(h)->tls_type; 2670 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2671 r_type = R_390_TLS_LE64; 2672 } 2673 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE) 2674 r_type = R_390_TLS_IE64; 2675 2676 if (r_type == R_390_TLS_LE64) 2677 { 2678 /* This relocation gets optimized away by the local exec 2679 access optimization. */ 2680 BFD_ASSERT (! unresolved_reloc); 2681 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2682 contents + rel->r_offset); 2683 continue; 2684 } 2685 2686 if (htab->sgot == NULL) 2687 abort (); 2688 2689 if (h != NULL) 2690 off = h->got.offset; 2691 else 2692 { 2693 if (local_got_offsets == NULL) 2694 abort (); 2695 2696 off = local_got_offsets[r_symndx]; 2697 } 2698 2699 emit_tls_relocs: 2700 2701 if ((off & 1) != 0) 2702 off &= ~1; 2703 else 2704 { 2705 Elf_Internal_Rela outrel; 2706 bfd_byte *loc; 2707 int dr_type, indx; 2708 2709 if (htab->srelgot == NULL) 2710 abort (); 2711 2712 outrel.r_offset = (htab->sgot->output_section->vma 2713 + htab->sgot->output_offset + off); 2714 2715 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2716 if (r_type == R_390_TLS_GD64) 2717 dr_type = R_390_TLS_DTPMOD; 2718 else 2719 dr_type = R_390_TLS_TPOFF; 2720 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2721 outrel.r_addend = relocation - dtpoff_base (info); 2722 else 2723 outrel.r_addend = 0; 2724 outrel.r_info = ELF64_R_INFO (indx, dr_type); 2725 loc = htab->srelgot->contents; 2726 loc += htab->srelgot->reloc_count++ 2727 * sizeof (Elf64_External_Rela); 2728 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2729 2730 if (r_type == R_390_TLS_GD64) 2731 { 2732 if (indx == 0) 2733 { 2734 BFD_ASSERT (! unresolved_reloc); 2735 bfd_put_64 (output_bfd, 2736 relocation - dtpoff_base (info), 2737 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2738 } 2739 else 2740 { 2741 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF); 2742 outrel.r_offset += GOT_ENTRY_SIZE; 2743 outrel.r_addend = 0; 2744 htab->srelgot->reloc_count++; 2745 loc += sizeof (Elf64_External_Rela); 2746 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2747 } 2748 } 2749 2750 if (h != NULL) 2751 h->got.offset |= 1; 2752 else 2753 local_got_offsets[r_symndx] |= 1; 2754 } 2755 2756 if (off >= (bfd_vma) -2) 2757 abort (); 2758 if (r_type == ELF64_R_TYPE (rel->r_info)) 2759 { 2760 relocation = htab->sgot->output_offset + off; 2761 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT) 2762 relocation += htab->sgot->output_section->vma; 2763 unresolved_reloc = FALSE; 2764 } 2765 else 2766 { 2767 bfd_put_64 (output_bfd, htab->sgot->output_offset + off, 2768 contents + rel->r_offset); 2769 continue; 2770 } 2771 break; 2772 2773 case R_390_TLS_GOTIE12: 2774 case R_390_TLS_GOTIE20: 2775 case R_390_TLS_IEENT: 2776 if (h == NULL) 2777 { 2778 if (local_got_offsets == NULL) 2779 abort(); 2780 off = local_got_offsets[r_symndx]; 2781 if (info->shared) 2782 goto emit_tls_relocs; 2783 } 2784 else 2785 { 2786 off = h->got.offset; 2787 tls_type = elf_s390_hash_entry(h)->tls_type; 2788 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 2789 goto emit_tls_relocs; 2790 } 2791 2792 if (htab->sgot == NULL) 2793 abort (); 2794 2795 BFD_ASSERT (! unresolved_reloc); 2796 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2797 htab->sgot->contents + off); 2798 relocation = htab->sgot->output_offset + off; 2799 if (r_type == R_390_TLS_IEENT) 2800 relocation += htab->sgot->output_section->vma; 2801 unresolved_reloc = FALSE; 2802 break; 2803 2804 case R_390_TLS_LDM64: 2805 if (! info->shared) 2806 /* The literal pool entry this relocation refers to gets ignored 2807 by the optimized code of the local exec model. Do nothing 2808 and the value will turn out zero. */ 2809 continue; 2810 2811 if (htab->sgot == NULL) 2812 abort (); 2813 2814 off = htab->tls_ldm_got.offset; 2815 if (off & 1) 2816 off &= ~1; 2817 else 2818 { 2819 Elf_Internal_Rela outrel; 2820 bfd_byte *loc; 2821 2822 if (htab->srelgot == NULL) 2823 abort (); 2824 2825 outrel.r_offset = (htab->sgot->output_section->vma 2826 + htab->sgot->output_offset + off); 2827 2828 bfd_put_64 (output_bfd, 0, 2829 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2830 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD); 2831 outrel.r_addend = 0; 2832 loc = htab->srelgot->contents; 2833 loc += htab->srelgot->reloc_count++ 2834 * sizeof (Elf64_External_Rela); 2835 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2836 htab->tls_ldm_got.offset |= 1; 2837 } 2838 relocation = htab->sgot->output_offset + off; 2839 unresolved_reloc = FALSE; 2840 break; 2841 2842 case R_390_TLS_LE64: 2843 if (info->shared) 2844 { 2845 /* Linking a shared library with non-fpic code requires 2846 a R_390_TLS_TPOFF relocation. */ 2847 Elf_Internal_Rela outrel; 2848 asection *sreloc; 2849 bfd_byte *loc; 2850 int indx; 2851 2852 outrel.r_offset = rel->r_offset 2853 + input_section->output_section->vma 2854 + input_section->output_offset; 2855 if (h != NULL && h->dynindx != -1) 2856 indx = h->dynindx; 2857 else 2858 indx = 0; 2859 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF); 2860 if (indx == 0) 2861 outrel.r_addend = relocation - dtpoff_base (info); 2862 else 2863 outrel.r_addend = 0; 2864 sreloc = elf_section_data (input_section)->sreloc; 2865 if (sreloc == NULL) 2866 abort (); 2867 loc = sreloc->contents; 2868 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2869 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2870 } 2871 else 2872 { 2873 BFD_ASSERT (! unresolved_reloc); 2874 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2875 contents + rel->r_offset); 2876 } 2877 continue; 2878 2879 case R_390_TLS_LDO64: 2880 if (info->shared || (input_section->flags & SEC_CODE) == 0) 2881 relocation -= dtpoff_base (info); 2882 else 2883 /* When converting LDO to LE, we must negate. */ 2884 relocation = -tpoff (info, relocation); 2885 break; 2886 2887 /* Relocations for tls instructions. */ 2888 case R_390_TLS_LOAD: 2889 case R_390_TLS_GDCALL: 2890 case R_390_TLS_LDCALL: 2891 tls_type = GOT_UNKNOWN; 2892 if (h == NULL && local_got_offsets) 2893 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2894 else if (h != NULL) 2895 tls_type = elf_s390_hash_entry(h)->tls_type; 2896 2897 if (tls_type == GOT_TLS_GD) 2898 continue; 2899 2900 if (r_type == R_390_TLS_LOAD) 2901 { 2902 if (!info->shared && (h == NULL || h->dynindx == -1)) 2903 { 2904 /* IE->LE transition. Four valid cases: 2905 lg %rx,(0,%ry) -> sllg %rx,%ry,0 2906 lg %rx,(%ry,0) -> sllg %rx,%ry,0 2907 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 2908 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */ 2909 unsigned int insn0, insn1, ry; 2910 2911 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2912 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2913 if (insn1 != 0x0004) 2914 invalid_tls_insn (input_bfd, input_section, rel); 2915 ry = 0; 2916 if ((insn0 & 0xff00f000) == 0xe3000000) 2917 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */ 2918 ry = (insn0 & 0x000f0000); 2919 else if ((insn0 & 0xff0f0000) == 0xe3000000) 2920 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */ 2921 ry = (insn0 & 0x0000f000) << 4; 2922 else if ((insn0 & 0xff00f000) == 0xe300c000) 2923 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */ 2924 ry = (insn0 & 0x000f0000); 2925 else if ((insn0 & 0xff0f0000) == 0xe30c0000) 2926 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */ 2927 ry = (insn0 & 0x0000f000) << 4; 2928 else 2929 invalid_tls_insn (input_bfd, input_section, rel); 2930 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry; 2931 insn1 = 0x000d; 2932 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2933 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2934 } 2935 } 2936 else if (r_type == R_390_TLS_GDCALL) 2937 { 2938 unsigned int insn0, insn1; 2939 2940 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2941 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2942 if ((insn0 & 0xffff0000) != 0xc0e50000) 2943 invalid_tls_insn (input_bfd, input_section, rel); 2944 if (!info->shared && (h == NULL || h->dynindx == -1)) 2945 { 2946 /* GD->LE transition. 2947 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2948 insn0 = 0xc0040000; 2949 insn1 = 0x0000; 2950 } 2951 else 2952 { 2953 /* GD->IE transition. 2954 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */ 2955 insn0 = 0xe322c000; 2956 insn1 = 0x0004; 2957 } 2958 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2959 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2960 } 2961 else if (r_type == R_390_TLS_LDCALL) 2962 { 2963 if (!info->shared) 2964 { 2965 unsigned int insn0, insn1; 2966 2967 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2968 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2969 if ((insn0 & 0xffff0000) != 0xc0e50000) 2970 invalid_tls_insn (input_bfd, input_section, rel); 2971 /* LD->LE transition. 2972 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2973 insn0 = 0xc0040000; 2974 insn1 = 0x0000; 2975 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2976 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2977 } 2978 } 2979 continue; 2980 2981 default: 2982 break; 2983 } 2984 2985 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 2986 because such sections are not SEC_ALLOC and thus ld.so will 2987 not process them. */ 2988 if (unresolved_reloc 2989 && !((input_section->flags & SEC_DEBUGGING) != 0 2990 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) 2991 (*_bfd_error_handler) 2992 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), 2993 bfd_archive_filename (input_bfd), 2994 bfd_get_section_name (input_bfd, input_section), 2995 (long) rel->r_offset, 2996 h->root.root.string); 2997 2998 if (r_type == R_390_20 2999 || r_type == R_390_GOT20 3000 || r_type == R_390_GOTPLT20 3001 || r_type == R_390_TLS_GOTIE20) 3002 { 3003 relocation += rel->r_addend; 3004 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3005 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3006 contents, rel->r_offset, 3007 relocation, 0); 3008 } 3009 else 3010 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3011 contents, rel->r_offset, 3012 relocation, rel->r_addend); 3013 3014 if (r != bfd_reloc_ok) 3015 { 3016 const char *name; 3017 3018 if (h != NULL) 3019 name = h->root.root.string; 3020 else 3021 { 3022 name = bfd_elf_string_from_elf_section (input_bfd, 3023 symtab_hdr->sh_link, 3024 sym->st_name); 3025 if (name == NULL) 3026 return FALSE; 3027 if (*name == '\0') 3028 name = bfd_section_name (input_bfd, sec); 3029 } 3030 3031 if (r == bfd_reloc_overflow) 3032 { 3033 3034 if (! ((*info->callbacks->reloc_overflow) 3035 (info, name, howto->name, (bfd_vma) 0, 3036 input_bfd, input_section, rel->r_offset))) 3037 return FALSE; 3038 } 3039 else 3040 { 3041 (*_bfd_error_handler) 3042 (_("%s(%s+0x%lx): reloc against `%s': error %d"), 3043 bfd_archive_filename (input_bfd), 3044 bfd_get_section_name (input_bfd, input_section), 3045 (long) rel->r_offset, name, (int) r); 3046 return FALSE; 3047 } 3048 } 3049 } 3050 3051 return TRUE; 3052} 3053 3054/* Finish up dynamic symbol handling. We set the contents of various 3055 dynamic sections here. */ 3056 3057static bfd_boolean 3058elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) 3059 bfd *output_bfd; 3060 struct bfd_link_info *info; 3061 struct elf_link_hash_entry *h; 3062 Elf_Internal_Sym *sym; 3063{ 3064 struct elf_s390_link_hash_table *htab; 3065 3066 htab = elf_s390_hash_table (info); 3067 3068 if (h->plt.offset != (bfd_vma) -1) 3069 { 3070 bfd_vma plt_index; 3071 bfd_vma got_offset; 3072 Elf_Internal_Rela rela; 3073 bfd_byte *loc; 3074 3075 /* This symbol has an entry in the procedure linkage table. Set 3076 it up. */ 3077 3078 if (h->dynindx == -1 3079 || htab->splt == NULL 3080 || htab->sgotplt == NULL 3081 || htab->srelplt == NULL) 3082 abort (); 3083 3084 /* Calc. index no. 3085 Current offset - size first entry / entry size. */ 3086 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3087 3088 /* Offset in GOT is PLT index plus GOT headers(3) times 8, 3089 addr & GOT addr. */ 3090 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3091 3092 /* Fill in the blueprint of a PLT. */ 3093 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0, 3094 htab->splt->contents + h->plt.offset); 3095 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, 3096 htab->splt->contents + h->plt.offset + 4); 3097 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, 3098 htab->splt->contents + h->plt.offset + 8); 3099 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, 3100 htab->splt->contents + h->plt.offset + 12); 3101 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, 3102 htab->splt->contents + h->plt.offset + 16); 3103 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5, 3104 htab->splt->contents + h->plt.offset + 20); 3105 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6, 3106 htab->splt->contents + h->plt.offset + 24); 3107 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7, 3108 htab->splt->contents + h->plt.offset + 28); 3109 /* Fixup the relative address to the GOT entry */ 3110 bfd_put_32 (output_bfd, 3111 (htab->sgotplt->output_section->vma + 3112 htab->sgotplt->output_offset + got_offset 3113 - (htab->splt->output_section->vma + h->plt.offset))/2, 3114 htab->splt->contents + h->plt.offset + 2); 3115 /* Fixup the relative branch to PLT 0 */ 3116 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + 3117 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3118 htab->splt->contents + h->plt.offset + 24); 3119 /* Fixup offset into symbol table */ 3120 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), 3121 htab->splt->contents + h->plt.offset + 28); 3122 3123 /* Fill in the entry in the global offset table. 3124 Points to instruction after GOT offset. */ 3125 bfd_put_64 (output_bfd, 3126 (htab->splt->output_section->vma 3127 + htab->splt->output_offset 3128 + h->plt.offset 3129 + 14), 3130 htab->sgotplt->contents + got_offset); 3131 3132 /* Fill in the entry in the .rela.plt section. */ 3133 rela.r_offset = (htab->sgotplt->output_section->vma 3134 + htab->sgotplt->output_offset 3135 + got_offset); 3136 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3137 rela.r_addend = 0; 3138 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); 3139 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3140 3141 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 3142 { 3143 /* Mark the symbol as undefined, rather than as defined in 3144 the .plt section. Leave the value alone. This is a clue 3145 for the dynamic linker, to make function pointer 3146 comparisons work between an application and shared 3147 library. */ 3148 sym->st_shndx = SHN_UNDEF; 3149 } 3150 } 3151 3152 if (h->got.offset != (bfd_vma) -1 3153 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3154 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3155 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3156 { 3157 Elf_Internal_Rela rela; 3158 bfd_byte *loc; 3159 3160 /* This symbol has an entry in the global offset table. Set it 3161 up. */ 3162 if (htab->sgot == NULL || htab->srelgot == NULL) 3163 abort (); 3164 3165 rela.r_offset = (htab->sgot->output_section->vma 3166 + htab->sgot->output_offset 3167 + (h->got.offset &~ (bfd_vma) 1)); 3168 3169 /* If this is a static link, or it is a -Bsymbolic link and the 3170 symbol is defined locally or was forced to be local because 3171 of a version file, we just want to emit a RELATIVE reloc. 3172 The entry in the global offset table will already have been 3173 initialized in the relocate_section function. */ 3174 if (info->shared 3175 && (info->symbolic 3176 || h->dynindx == -1 3177 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) 3178 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) 3179 { 3180 BFD_ASSERT((h->got.offset & 1) != 0); 3181 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 3182 rela.r_addend = (h->root.u.def.value 3183 + h->root.u.def.section->output_section->vma 3184 + h->root.u.def.section->output_offset); 3185 } 3186 else 3187 { 3188 BFD_ASSERT((h->got.offset & 1) == 0); 3189 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset); 3190 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); 3191 rela.r_addend = 0; 3192 } 3193 3194 loc = htab->srelgot->contents; 3195 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3196 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3197 } 3198 3199 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) 3200 { 3201 Elf_Internal_Rela rela; 3202 bfd_byte *loc; 3203 3204 /* This symbols needs a copy reloc. Set it up. */ 3205 3206 if (h->dynindx == -1 3207 || (h->root.type != bfd_link_hash_defined 3208 && h->root.type != bfd_link_hash_defweak) 3209 || htab->srelbss == NULL) 3210 abort (); 3211 3212 rela.r_offset = (h->root.u.def.value 3213 + h->root.u.def.section->output_section->vma 3214 + h->root.u.def.section->output_offset); 3215 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); 3216 rela.r_addend = 0; 3217 loc = htab->srelbss->contents; 3218 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); 3219 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3220 } 3221 3222 /* Mark some specially defined symbols as absolute. */ 3223 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3224 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 3225 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) 3226 sym->st_shndx = SHN_ABS; 3227 3228 return TRUE; 3229} 3230 3231/* Used to decide how to sort relocs in an optimal manner for the 3232 dynamic linker, before writing them out. */ 3233 3234static enum elf_reloc_type_class 3235elf_s390_reloc_type_class (rela) 3236 const Elf_Internal_Rela *rela; 3237{ 3238 switch ((int) ELF64_R_TYPE (rela->r_info)) 3239 { 3240 case R_390_RELATIVE: 3241 return reloc_class_relative; 3242 case R_390_JMP_SLOT: 3243 return reloc_class_plt; 3244 case R_390_COPY: 3245 return reloc_class_copy; 3246 default: 3247 return reloc_class_normal; 3248 } 3249} 3250 3251/* Finish up the dynamic sections. */ 3252 3253static bfd_boolean 3254elf_s390_finish_dynamic_sections (output_bfd, info) 3255 bfd *output_bfd; 3256 struct bfd_link_info *info; 3257{ 3258 struct elf_s390_link_hash_table *htab; 3259 bfd *dynobj; 3260 asection *sdyn; 3261 3262 htab = elf_s390_hash_table (info); 3263 dynobj = htab->elf.dynobj; 3264 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3265 3266 if (htab->elf.dynamic_sections_created) 3267 { 3268 Elf64_External_Dyn *dyncon, *dynconend; 3269 3270 if (sdyn == NULL || htab->sgot == NULL) 3271 abort (); 3272 3273 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3274 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); 3275 for (; dyncon < dynconend; dyncon++) 3276 { 3277 Elf_Internal_Dyn dyn; 3278 asection *s; 3279 3280 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3281 3282 switch (dyn.d_tag) 3283 { 3284 default: 3285 continue; 3286 3287 case DT_PLTGOT: 3288 dyn.d_un.d_ptr = htab->sgot->output_section->vma; 3289 break; 3290 3291 case DT_JMPREL: 3292 dyn.d_un.d_ptr = htab->srelplt->output_section->vma; 3293 break; 3294 3295 case DT_PLTRELSZ: 3296 s = htab->srelplt->output_section; 3297 if (s->_cooked_size != 0) 3298 dyn.d_un.d_val = s->_cooked_size; 3299 else 3300 dyn.d_un.d_val = s->_raw_size; 3301 break; 3302 3303 case DT_RELASZ: 3304 /* The procedure linkage table relocs (DT_JMPREL) should 3305 not be included in the overall relocs (DT_RELA). 3306 Therefore, we override the DT_RELASZ entry here to 3307 make it not include the JMPREL relocs. Since the 3308 linker script arranges for .rela.plt to follow all 3309 other relocation sections, we don't have to worry 3310 about changing the DT_RELA entry. */ 3311 s = htab->srelplt->output_section; 3312 if (s->_cooked_size != 0) 3313 dyn.d_un.d_val -= s->_cooked_size; 3314 else 3315 dyn.d_un.d_val -= s->_raw_size; 3316 break; 3317 } 3318 3319 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3320 } 3321 3322 /* Fill in the special first entry in the procedure linkage table. */ 3323 if (htab->splt && htab->splt->_raw_size > 0) 3324 { 3325 /* fill in blueprint for plt 0 entry */ 3326 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0, 3327 htab->splt->contents ); 3328 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, 3329 htab->splt->contents +4 ); 3330 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, 3331 htab->splt->contents +12 ); 3332 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, 3333 htab->splt->contents +16 ); 3334 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, 3335 htab->splt->contents +20 ); 3336 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6, 3337 htab->splt->contents + 24); 3338 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7, 3339 htab->splt->contents + 28 ); 3340 /* Fixup relative address to start of GOT */ 3341 bfd_put_32 (output_bfd, 3342 (htab->sgotplt->output_section->vma + 3343 htab->sgotplt->output_offset 3344 - htab->splt->output_section->vma - 6)/2, 3345 htab->splt->contents + 8); 3346 } 3347 elf_section_data (htab->splt->output_section) 3348 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; 3349 } 3350 3351 if (htab->sgotplt) 3352 { 3353 /* Fill in the first three entries in the global offset table. */ 3354 if (htab->sgotplt->_raw_size > 0) 3355 { 3356 bfd_put_64 (output_bfd, 3357 (sdyn == NULL ? (bfd_vma) 0 3358 : sdyn->output_section->vma + sdyn->output_offset), 3359 htab->sgotplt->contents); 3360 /* One entry for shared object struct ptr. */ 3361 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); 3362 /* One entry for _dl_runtime_resolve. */ 3363 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12); 3364 } 3365 3366 elf_section_data (htab->sgot->output_section) 3367 ->this_hdr.sh_entsize = 8; 3368 } 3369 return TRUE; 3370} 3371 3372/* Why was the hash table entry size definition changed from 3373 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and 3374 this is the only reason for the s390_elf64_size_info structure. */ 3375 3376const struct elf_size_info s390_elf64_size_info = 3377{ 3378 sizeof (Elf64_External_Ehdr), 3379 sizeof (Elf64_External_Phdr), 3380 sizeof (Elf64_External_Shdr), 3381 sizeof (Elf64_External_Rel), 3382 sizeof (Elf64_External_Rela), 3383 sizeof (Elf64_External_Sym), 3384 sizeof (Elf64_External_Dyn), 3385 sizeof (Elf_External_Note), 3386 8, /* hash-table entry size. */ 3387 1, /* internal relocations per external relocations. */ 3388 64, /* arch_size. */ 3389 3, /* log_file_align. */ 3390 ELFCLASS64, EV_CURRENT, 3391 bfd_elf64_write_out_phdrs, 3392 bfd_elf64_write_shdrs_and_ehdr, 3393 bfd_elf64_write_relocs, 3394 bfd_elf64_swap_symbol_in, 3395 bfd_elf64_swap_symbol_out, 3396 bfd_elf64_slurp_reloc_table, 3397 bfd_elf64_slurp_symbol_table, 3398 bfd_elf64_swap_dyn_in, 3399 bfd_elf64_swap_dyn_out, 3400 bfd_elf64_swap_reloc_in, 3401 bfd_elf64_swap_reloc_out, 3402 bfd_elf64_swap_reloca_in, 3403 bfd_elf64_swap_reloca_out 3404}; 3405 3406#define TARGET_BIG_SYM bfd_elf64_s390_vec 3407#define TARGET_BIG_NAME "elf64-s390" 3408#define ELF_ARCH bfd_arch_s390 3409#define ELF_MACHINE_CODE EM_S390 3410#define ELF_MACHINE_ALT1 EM_S390_OLD 3411#define ELF_MAXPAGESIZE 0x1000 3412 3413#define elf_backend_size_info s390_elf64_size_info 3414 3415#define elf_backend_can_gc_sections 1 3416#define elf_backend_can_refcount 1 3417#define elf_backend_want_got_plt 1 3418#define elf_backend_plt_readonly 1 3419#define elf_backend_want_plt_sym 0 3420#define elf_backend_got_header_size 24 3421#define elf_backend_rela_normal 1 3422 3423#define elf_info_to_howto elf_s390_info_to_howto 3424 3425#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name 3426#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create 3427#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3428 3429#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3430#define elf_backend_check_relocs elf_s390_check_relocs 3431#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3432#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 3433#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3434#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3435#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3436#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 3437#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3438#define elf_backend_relocate_section elf_s390_relocate_section 3439#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 3440#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3441 3442#define bfd_elf64_mkobject elf_s390_mkobject 3443#define elf_backend_object_p elf_s390_object_p 3444 3445#include "elf64-target.h" 3446