1/* IBM S/390-specific support for 64-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 3 Free Software Foundation, Inc. 4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com). 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 21 02110-1301, USA. */ 22 23#include "bfd.h" 24#include "sysdep.h" 25#include "bfdlink.h" 26#include "libbfd.h" 27#include "elf-bfd.h" 28 29static reloc_howto_type *elf_s390_reloc_type_lookup 30 PARAMS ((bfd *, bfd_reloc_code_real_type)); 31static void elf_s390_info_to_howto 32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 33static bfd_boolean elf_s390_is_local_label_name 34 PARAMS ((bfd *, const char *)); 35static struct bfd_hash_entry *link_hash_newfunc 36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 37static struct bfd_link_hash_table *elf_s390_link_hash_table_create 38 PARAMS ((bfd *)); 39static bfd_boolean create_got_section 40 PARAMS((bfd *, struct bfd_link_info *)); 41static bfd_boolean elf_s390_create_dynamic_sections 42 PARAMS((bfd *, struct bfd_link_info *)); 43static void elf_s390_copy_indirect_symbol 44 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, 45 struct elf_link_hash_entry *)); 46static bfd_boolean elf_s390_check_relocs 47 PARAMS ((bfd *, struct bfd_link_info *, asection *, 48 const Elf_Internal_Rela *)); 49struct elf_s390_link_hash_entry; 50static void elf_s390_adjust_gotplt 51 PARAMS ((struct elf_s390_link_hash_entry *)); 52static bfd_boolean elf_s390_adjust_dynamic_symbol 53 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 54static bfd_boolean allocate_dynrelocs 55 PARAMS ((struct elf_link_hash_entry *, PTR)); 56static bfd_boolean readonly_dynrelocs 57 PARAMS ((struct elf_link_hash_entry *, PTR)); 58static bfd_boolean elf_s390_size_dynamic_sections 59 PARAMS ((bfd *, struct bfd_link_info *)); 60static bfd_boolean elf_s390_relocate_section 61 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 62 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 63static bfd_boolean elf_s390_finish_dynamic_symbol 64 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 65 Elf_Internal_Sym *)); 66static enum elf_reloc_type_class elf_s390_reloc_type_class 67 PARAMS ((const Elf_Internal_Rela *)); 68static bfd_boolean elf_s390_finish_dynamic_sections 69 PARAMS ((bfd *, struct bfd_link_info *)); 70static bfd_boolean elf_s390_object_p 71 PARAMS ((bfd *)); 72static int elf_s390_tls_transition 73 PARAMS ((struct bfd_link_info *, int, int)); 74static bfd_reloc_status_type s390_tls_reloc 75 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 76static bfd_vma dtpoff_base 77 PARAMS ((struct bfd_link_info *)); 78static bfd_vma tpoff 79 PARAMS ((struct bfd_link_info *, bfd_vma)); 80static void invalid_tls_insn 81 PARAMS ((bfd *, asection *, Elf_Internal_Rela *)); 82static bfd_reloc_status_type s390_elf_ldisp_reloc 83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 84 85#include "elf/s390.h" 86 87/* In case we're on a 32-bit machine, construct a 64-bit "-1" value 88 from smaller values. Start with zero, widen, *then* decrement. */ 89#define MINUS_ONE (((bfd_vma)0) - 1) 90 91/* The relocation "howto" table. */ 92static reloc_howto_type elf_howto_table[] = 93{ 94 HOWTO (R_390_NONE, /* type */ 95 0, /* rightshift */ 96 0, /* size (0 = byte, 1 = short, 2 = long) */ 97 0, /* bitsize */ 98 FALSE, /* pc_relative */ 99 0, /* bitpos */ 100 complain_overflow_dont, /* complain_on_overflow */ 101 bfd_elf_generic_reloc, /* special_function */ 102 "R_390_NONE", /* name */ 103 FALSE, /* partial_inplace */ 104 0, /* src_mask */ 105 0, /* dst_mask */ 106 FALSE), /* pcrel_offset */ 107 108 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 109 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 110 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 111 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 112 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 113 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 114 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 115 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 116 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 118 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 119 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 120 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 121 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 122 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 123 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 124 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 125 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE), 126 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE), 128 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 129 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE), 130 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 131 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE), 132 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 133 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE), 134 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 135 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE), 136 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 137 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 138 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 139 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 140 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 141 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 142 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 143 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 144 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 145 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 146 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 147 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 148 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 149 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE), 150 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 151 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE), 152 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 153 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE), 154 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 155 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE), 156 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 157 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE), 158 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 159 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE), 160 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 161 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 162 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 163 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE), 164 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 165 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 166 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 167 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 168 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 169 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 170 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 171 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE), 172 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 173 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE), 174 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 175 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 176 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 177 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 178 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 179 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE), 180 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 181 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 182 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 183 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 184 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 185 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 186 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */ 187 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 188 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE), 189 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 190 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 191 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */ 192 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 193 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE), 194 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */ 195 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 196 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE), 197 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */ 198 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 199 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE), 200 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 201 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE), 202 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */ 203 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 204 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE), 205 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */ 206 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 207 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE), 208 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE), 210 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE), 212 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE), 214 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 215 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 216 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 217 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 218 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 219 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 220 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 221 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 222}; 223 224/* GNU extension to record C++ vtable hierarchy. */ 225static reloc_howto_type elf64_s390_vtinherit_howto = 226 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 227static reloc_howto_type elf64_s390_vtentry_howto = 228 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); 229 230static reloc_howto_type * 231elf_s390_reloc_type_lookup (abfd, code) 232 bfd *abfd ATTRIBUTE_UNUSED; 233 bfd_reloc_code_real_type code; 234{ 235 switch (code) 236 { 237 case BFD_RELOC_NONE: 238 return &elf_howto_table[(int) R_390_NONE]; 239 case BFD_RELOC_8: 240 return &elf_howto_table[(int) R_390_8]; 241 case BFD_RELOC_390_12: 242 return &elf_howto_table[(int) R_390_12]; 243 case BFD_RELOC_16: 244 return &elf_howto_table[(int) R_390_16]; 245 case BFD_RELOC_32: 246 return &elf_howto_table[(int) R_390_32]; 247 case BFD_RELOC_CTOR: 248 return &elf_howto_table[(int) R_390_32]; 249 case BFD_RELOC_32_PCREL: 250 return &elf_howto_table[(int) R_390_PC32]; 251 case BFD_RELOC_390_GOT12: 252 return &elf_howto_table[(int) R_390_GOT12]; 253 case BFD_RELOC_32_GOT_PCREL: 254 return &elf_howto_table[(int) R_390_GOT32]; 255 case BFD_RELOC_390_PLT32: 256 return &elf_howto_table[(int) R_390_PLT32]; 257 case BFD_RELOC_390_COPY: 258 return &elf_howto_table[(int) R_390_COPY]; 259 case BFD_RELOC_390_GLOB_DAT: 260 return &elf_howto_table[(int) R_390_GLOB_DAT]; 261 case BFD_RELOC_390_JMP_SLOT: 262 return &elf_howto_table[(int) R_390_JMP_SLOT]; 263 case BFD_RELOC_390_RELATIVE: 264 return &elf_howto_table[(int) R_390_RELATIVE]; 265 case BFD_RELOC_32_GOTOFF: 266 return &elf_howto_table[(int) R_390_GOTOFF32]; 267 case BFD_RELOC_390_GOTPC: 268 return &elf_howto_table[(int) R_390_GOTPC]; 269 case BFD_RELOC_390_GOT16: 270 return &elf_howto_table[(int) R_390_GOT16]; 271 case BFD_RELOC_16_PCREL: 272 return &elf_howto_table[(int) R_390_PC16]; 273 case BFD_RELOC_390_PC16DBL: 274 return &elf_howto_table[(int) R_390_PC16DBL]; 275 case BFD_RELOC_390_PLT16DBL: 276 return &elf_howto_table[(int) R_390_PLT16DBL]; 277 case BFD_RELOC_390_PC32DBL: 278 return &elf_howto_table[(int) R_390_PC32DBL]; 279 case BFD_RELOC_390_PLT32DBL: 280 return &elf_howto_table[(int) R_390_PLT32DBL]; 281 case BFD_RELOC_390_GOTPCDBL: 282 return &elf_howto_table[(int) R_390_GOTPCDBL]; 283 case BFD_RELOC_64: 284 return &elf_howto_table[(int) R_390_64]; 285 case BFD_RELOC_64_PCREL: 286 return &elf_howto_table[(int) R_390_PC64]; 287 case BFD_RELOC_390_GOT64: 288 return &elf_howto_table[(int) R_390_GOT64]; 289 case BFD_RELOC_390_PLT64: 290 return &elf_howto_table[(int) R_390_PLT64]; 291 case BFD_RELOC_390_GOTENT: 292 return &elf_howto_table[(int) R_390_GOTENT]; 293 case BFD_RELOC_16_GOTOFF: 294 return &elf_howto_table[(int) R_390_GOTOFF16]; 295 case BFD_RELOC_390_GOTOFF64: 296 return &elf_howto_table[(int) R_390_GOTOFF64]; 297 case BFD_RELOC_390_GOTPLT12: 298 return &elf_howto_table[(int) R_390_GOTPLT12]; 299 case BFD_RELOC_390_GOTPLT16: 300 return &elf_howto_table[(int) R_390_GOTPLT16]; 301 case BFD_RELOC_390_GOTPLT32: 302 return &elf_howto_table[(int) R_390_GOTPLT32]; 303 case BFD_RELOC_390_GOTPLT64: 304 return &elf_howto_table[(int) R_390_GOTPLT64]; 305 case BFD_RELOC_390_GOTPLTENT: 306 return &elf_howto_table[(int) R_390_GOTPLTENT]; 307 case BFD_RELOC_390_PLTOFF16: 308 return &elf_howto_table[(int) R_390_PLTOFF16]; 309 case BFD_RELOC_390_PLTOFF32: 310 return &elf_howto_table[(int) R_390_PLTOFF32]; 311 case BFD_RELOC_390_PLTOFF64: 312 return &elf_howto_table[(int) R_390_PLTOFF64]; 313 case BFD_RELOC_390_TLS_LOAD: 314 return &elf_howto_table[(int) R_390_TLS_LOAD]; 315 case BFD_RELOC_390_TLS_GDCALL: 316 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 317 case BFD_RELOC_390_TLS_LDCALL: 318 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 319 case BFD_RELOC_390_TLS_GD64: 320 return &elf_howto_table[(int) R_390_TLS_GD64]; 321 case BFD_RELOC_390_TLS_GOTIE12: 322 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 323 case BFD_RELOC_390_TLS_GOTIE64: 324 return &elf_howto_table[(int) R_390_TLS_GOTIE64]; 325 case BFD_RELOC_390_TLS_LDM64: 326 return &elf_howto_table[(int) R_390_TLS_LDM64]; 327 case BFD_RELOC_390_TLS_IE64: 328 return &elf_howto_table[(int) R_390_TLS_IE64]; 329 case BFD_RELOC_390_TLS_IEENT: 330 return &elf_howto_table[(int) R_390_TLS_IEENT]; 331 case BFD_RELOC_390_TLS_LE64: 332 return &elf_howto_table[(int) R_390_TLS_LE64]; 333 case BFD_RELOC_390_TLS_LDO64: 334 return &elf_howto_table[(int) R_390_TLS_LDO64]; 335 case BFD_RELOC_390_TLS_DTPMOD: 336 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 337 case BFD_RELOC_390_TLS_DTPOFF: 338 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 339 case BFD_RELOC_390_TLS_TPOFF: 340 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 341 case BFD_RELOC_390_20: 342 return &elf_howto_table[(int) R_390_20]; 343 case BFD_RELOC_390_GOT20: 344 return &elf_howto_table[(int) R_390_GOT20]; 345 case BFD_RELOC_390_GOTPLT20: 346 return &elf_howto_table[(int) R_390_GOTPLT20]; 347 case BFD_RELOC_390_TLS_GOTIE20: 348 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 349 case BFD_RELOC_VTABLE_INHERIT: 350 return &elf64_s390_vtinherit_howto; 351 case BFD_RELOC_VTABLE_ENTRY: 352 return &elf64_s390_vtentry_howto; 353 default: 354 break; 355 } 356 return 0; 357} 358 359/* We need to use ELF64_R_TYPE so we have our own copy of this function, 360 and elf64-s390.c has its own copy. */ 361 362static void 363elf_s390_info_to_howto (abfd, cache_ptr, dst) 364 bfd *abfd ATTRIBUTE_UNUSED; 365 arelent *cache_ptr; 366 Elf_Internal_Rela *dst; 367{ 368 unsigned int r_type = ELF64_R_TYPE(dst->r_info); 369 switch (r_type) 370 { 371 case R_390_GNU_VTINHERIT: 372 cache_ptr->howto = &elf64_s390_vtinherit_howto; 373 break; 374 375 case R_390_GNU_VTENTRY: 376 cache_ptr->howto = &elf64_s390_vtentry_howto; 377 break; 378 379 default: 380 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 381 { 382 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 383 abfd, (int) r_type); 384 r_type = R_390_NONE; 385 } 386 cache_ptr->howto = &elf_howto_table[r_type]; 387 } 388} 389 390/* A relocation function which doesn't do anything. */ 391static bfd_reloc_status_type 392s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section, 393 output_bfd, error_message) 394 bfd *abfd ATTRIBUTE_UNUSED; 395 arelent *reloc_entry; 396 asymbol *symbol ATTRIBUTE_UNUSED; 397 PTR data ATTRIBUTE_UNUSED; 398 asection *input_section; 399 bfd *output_bfd; 400 char **error_message ATTRIBUTE_UNUSED; 401{ 402 if (output_bfd) 403 reloc_entry->address += input_section->output_offset; 404 return bfd_reloc_ok; 405} 406 407/* Handle the large displacement relocs. */ 408static bfd_reloc_status_type 409s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section, 410 output_bfd, error_message) 411 bfd *abfd; 412 arelent *reloc_entry; 413 asymbol *symbol; 414 PTR data; 415 asection *input_section; 416 bfd *output_bfd; 417 char **error_message ATTRIBUTE_UNUSED; 418{ 419 reloc_howto_type *howto = reloc_entry->howto; 420 bfd_vma relocation; 421 bfd_vma insn; 422 423 if (output_bfd != (bfd *) NULL 424 && (symbol->flags & BSF_SECTION_SYM) == 0 425 && (! howto->partial_inplace 426 || reloc_entry->addend == 0)) 427 { 428 reloc_entry->address += input_section->output_offset; 429 return bfd_reloc_ok; 430 } 431 if (output_bfd != NULL) 432 return bfd_reloc_continue; 433 434 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 435 return bfd_reloc_outofrange; 436 437 relocation = (symbol->value 438 + symbol->section->output_section->vma 439 + symbol->section->output_offset); 440 relocation += reloc_entry->addend; 441 if (howto->pc_relative) 442 { 443 relocation -= (input_section->output_section->vma 444 + input_section->output_offset); 445 relocation -= reloc_entry->address; 446 } 447 448 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 449 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 450 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 451 452 if ((bfd_signed_vma) relocation < - 0x80000 453 || (bfd_signed_vma) relocation > 0x7ffff) 454 return bfd_reloc_overflow; 455 else 456 return bfd_reloc_ok; 457} 458 459static bfd_boolean 460elf_s390_is_local_label_name (abfd, name) 461 bfd *abfd; 462 const char *name; 463{ 464 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 465 return TRUE; 466 467 return _bfd_elf_is_local_label_name (abfd, name); 468} 469 470/* Functions for the 390 ELF linker. */ 471 472/* The name of the dynamic interpreter. This is put in the .interp 473 section. */ 474 475#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 476 477/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 478 copying dynamic variables from a shared lib into an app's dynbss 479 section, and instead use a dynamic relocation to point into the 480 shared lib. */ 481#define ELIMINATE_COPY_RELOCS 1 482 483/* The size in bytes of the first entry in the procedure linkage table. */ 484#define PLT_FIRST_ENTRY_SIZE 32 485/* The size in bytes of an entry in the procedure linkage table. */ 486#define PLT_ENTRY_SIZE 32 487 488#define GOT_ENTRY_SIZE 8 489 490/* The first three entries in a procedure linkage table are reserved, 491 and the initial contents are unimportant (we zero them out). 492 Subsequent entries look like this. See the SVR4 ABI 386 493 supplement to see how this works. */ 494 495/* For the s390, simple addr offset can only be 0 - 4096. 496 To use the full 16777216 TB address space, several instructions 497 are needed to load an address in a register and execute 498 a branch( or just saving the address) 499 500 Furthermore, only r 0 and 1 are free to use!!! */ 501 502/* The first 3 words in the GOT are then reserved. 503 Word 0 is the address of the dynamic table. 504 Word 1 is a pointer to a structure describing the object 505 Word 2 is used to point to the loader entry address. 506 507 The code for PLT entries looks like this: 508 509 The GOT holds the address in the PLT to be executed. 510 The loader then gets: 511 24(15) = Pointer to the structure describing the object. 512 28(15) = Offset in symbol table 513 The loader must then find the module where the function is 514 and insert the address in the GOT. 515 516 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 517 LG 1,0(1) # 6 bytes Load address from GOT in r1 518 BCR 15,1 # 2 bytes Jump to address 519 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 520 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 521 BRCL 15,-x # 6 bytes Jump to start of PLT 522 .long ? # 4 bytes offset into symbol table 523 524 Total = 32 bytes per PLT entry 525 Fixup at offset 2: relative address to GOT entry 526 Fixup at offset 22: relative branch to PLT0 527 Fixup at offset 28: 32 bit offset into symbol table 528 529 A 32 bit offset into the symbol table is enough. It allows for symbol 530 tables up to a size of 2 gigabyte. A single dynamic object (the main 531 program, any shared library) is limited to 4GB in size and I want to see 532 the program that manages to have a symbol table of more than 2 GB with a 533 total size of at max 4 GB. */ 534 535#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000 536#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 537#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 538#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 539#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c 540#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 541#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 542#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000 543 544/* The first PLT entry pushes the offset into the symbol table 545 from R1 onto the stack at 8(15) and the loader object info 546 at 12(15), loads the loader address in R1 and jumps to it. */ 547 548/* The first entry in the PLT: 549 550 PLT0: 551 STG 1,56(15) # r1 contains the offset into the symbol table 552 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table 553 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack 554 LG 1,16(1) # get entry address of loader 555 BCR 15,1 # jump to loader 556 557 Fixup at offset 8: relative address to start of GOT. */ 558 559#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038 560#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 561#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 562#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 563#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 564#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 565#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 566#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 567 568/* The s390 linker needs to keep track of the number of relocs that it 569 decides to copy as dynamic relocs in check_relocs for each symbol. 570 This is so that it can later discard them if they are found to be 571 unnecessary. We store the information in a field extending the 572 regular ELF linker hash table. */ 573 574struct elf_s390_dyn_relocs 575{ 576 struct elf_s390_dyn_relocs *next; 577 578 /* The input section of the reloc. */ 579 asection *sec; 580 581 /* Total number of relocs copied for the input section. */ 582 bfd_size_type count; 583 584 /* Number of pc-relative relocs copied for the input section. */ 585 bfd_size_type pc_count; 586}; 587 588/* s390 ELF linker hash entry. */ 589 590struct elf_s390_link_hash_entry 591{ 592 struct elf_link_hash_entry elf; 593 594 /* Track dynamic relocs copied for this symbol. */ 595 struct elf_s390_dyn_relocs *dyn_relocs; 596 597 /* Number of GOTPLT references for a function. */ 598 bfd_signed_vma gotplt_refcount; 599 600#define GOT_UNKNOWN 0 601#define GOT_NORMAL 1 602#define GOT_TLS_GD 2 603#define GOT_TLS_IE 3 604#define GOT_TLS_IE_NLT 3 605 unsigned char tls_type; 606}; 607 608#define elf_s390_hash_entry(ent) \ 609 ((struct elf_s390_link_hash_entry *)(ent)) 610 611struct elf_s390_obj_tdata 612{ 613 struct elf_obj_tdata root; 614 615 /* tls_type for each local got entry. */ 616 char *local_got_tls_type; 617}; 618 619#define elf_s390_tdata(abfd) \ 620 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 621 622#define elf_s390_local_got_tls_type(abfd) \ 623 (elf_s390_tdata (abfd)->local_got_tls_type) 624 625static bfd_boolean 626elf_s390_mkobject (bfd *abfd) 627{ 628 if (abfd->tdata.any == NULL) 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 } 635 return bfd_elf_mkobject (abfd); 636} 637 638static bfd_boolean 639elf_s390_object_p (abfd) 640 bfd *abfd; 641{ 642 /* Set the right machine number for an s390 elf32 file. */ 643 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); 644} 645 646/* s390 ELF linker hash table. */ 647 648struct elf_s390_link_hash_table 649{ 650 struct elf_link_hash_table elf; 651 652 /* Short-cuts to get to dynamic linker sections. */ 653 asection *sgot; 654 asection *sgotplt; 655 asection *srelgot; 656 asection *splt; 657 asection *srelplt; 658 asection *sdynbss; 659 asection *srelbss; 660 661 union { 662 bfd_signed_vma refcount; 663 bfd_vma offset; 664 } tls_ldm_got; 665 666 /* Small local sym to section mapping cache. */ 667 struct sym_sec_cache sym_sec; 668}; 669 670/* Get the s390 ELF linker hash table from a link_info structure. */ 671 672#define elf_s390_hash_table(p) \ 673 ((struct elf_s390_link_hash_table *) ((p)->hash)) 674 675/* Create an entry in an s390 ELF linker hash table. */ 676 677static struct bfd_hash_entry * 678link_hash_newfunc (entry, table, string) 679 struct bfd_hash_entry *entry; 680 struct bfd_hash_table *table; 681 const char *string; 682{ 683 /* Allocate the structure if it has not already been allocated by a 684 subclass. */ 685 if (entry == NULL) 686 { 687 entry = bfd_hash_allocate (table, 688 sizeof (struct elf_s390_link_hash_entry)); 689 if (entry == NULL) 690 return entry; 691 } 692 693 /* Call the allocation method of the superclass. */ 694 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 695 if (entry != NULL) 696 { 697 struct elf_s390_link_hash_entry *eh; 698 699 eh = (struct elf_s390_link_hash_entry *) entry; 700 eh->dyn_relocs = NULL; 701 eh->gotplt_refcount = 0; 702 eh->tls_type = GOT_UNKNOWN; 703 } 704 705 return entry; 706} 707 708/* Create an s390 ELF linker hash table. */ 709 710static struct bfd_link_hash_table * 711elf_s390_link_hash_table_create (abfd) 712 bfd *abfd; 713{ 714 struct elf_s390_link_hash_table *ret; 715 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 716 717 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt); 718 if (ret == NULL) 719 return NULL; 720 721 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 722 sizeof (struct elf_s390_link_hash_entry))) 723 { 724 free (ret); 725 return NULL; 726 } 727 728 ret->sgot = NULL; 729 ret->sgotplt = NULL; 730 ret->srelgot = NULL; 731 ret->splt = NULL; 732 ret->srelplt = NULL; 733 ret->sdynbss = NULL; 734 ret->srelbss = NULL; 735 ret->tls_ldm_got.refcount = 0; 736 ret->sym_sec.abfd = NULL; 737 738 return &ret->elf.root; 739} 740 741/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 742 shortcuts to them in our hash table. */ 743 744static bfd_boolean 745create_got_section (dynobj, info) 746 bfd *dynobj; 747 struct bfd_link_info *info; 748{ 749 struct elf_s390_link_hash_table *htab; 750 751 if (! _bfd_elf_create_got_section (dynobj, info)) 752 return FALSE; 753 754 htab = elf_s390_hash_table (info); 755 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 756 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 757 if (!htab->sgot || !htab->sgotplt) 758 abort (); 759 760 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", 761 (SEC_ALLOC | SEC_LOAD 762 | SEC_HAS_CONTENTS 763 | SEC_IN_MEMORY 764 | SEC_LINKER_CREATED 765 | SEC_READONLY)); 766 if (htab->srelgot == NULL 767 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) 768 return FALSE; 769 return TRUE; 770} 771 772/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 773 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 774 hash table. */ 775 776static bfd_boolean 777elf_s390_create_dynamic_sections (dynobj, info) 778 bfd *dynobj; 779 struct bfd_link_info *info; 780{ 781 struct elf_s390_link_hash_table *htab; 782 783 htab = elf_s390_hash_table (info); 784 if (!htab->sgot && !create_got_section (dynobj, info)) 785 return FALSE; 786 787 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 788 return FALSE; 789 790 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 791 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 792 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 793 if (!info->shared) 794 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 795 796 if (!htab->splt || !htab->srelplt || !htab->sdynbss 797 || (!info->shared && !htab->srelbss)) 798 abort (); 799 800 return TRUE; 801} 802 803/* Copy the extra info we tack onto an elf_link_hash_entry. */ 804 805static void 806elf_s390_copy_indirect_symbol (info, dir, ind) 807 struct bfd_link_info *info; 808 struct elf_link_hash_entry *dir, *ind; 809{ 810 struct elf_s390_link_hash_entry *edir, *eind; 811 812 edir = (struct elf_s390_link_hash_entry *) dir; 813 eind = (struct elf_s390_link_hash_entry *) ind; 814 815 if (eind->dyn_relocs != NULL) 816 { 817 if (edir->dyn_relocs != NULL) 818 { 819 struct elf_s390_dyn_relocs **pp; 820 struct elf_s390_dyn_relocs *p; 821 822 /* Add reloc counts against the indirect sym to the direct 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->dynamic_adjusted) 856 { 857 /* If called to transfer flags for a weakdef during processing 858 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 859 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 860 dir->ref_dynamic |= ind->ref_dynamic; 861 dir->ref_regular |= ind->ref_regular; 862 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 863 dir->needs_plt |= ind->needs_plt; 864 } 865 else 866 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 867} 868 869static int 870elf_s390_tls_transition (info, r_type, is_local) 871 struct bfd_link_info *info; 872 int r_type; 873 int is_local; 874{ 875 if (info->shared) 876 return r_type; 877 878 switch (r_type) 879 { 880 case R_390_TLS_GD64: 881 case R_390_TLS_IE64: 882 if (is_local) 883 return R_390_TLS_LE64; 884 return R_390_TLS_IE64; 885 case R_390_TLS_GOTIE64: 886 if (is_local) 887 return R_390_TLS_LE64; 888 return R_390_TLS_GOTIE64; 889 case R_390_TLS_LDM64: 890 return R_390_TLS_LE64; 891 } 892 893 return r_type; 894} 895 896/* Look through the relocs for a section during the first phase, and 897 allocate space in the global offset table or procedure linkage 898 table. */ 899 900static bfd_boolean 901elf_s390_check_relocs (abfd, info, sec, relocs) 902 bfd *abfd; 903 struct bfd_link_info *info; 904 asection *sec; 905 const Elf_Internal_Rela *relocs; 906{ 907 struct elf_s390_link_hash_table *htab; 908 Elf_Internal_Shdr *symtab_hdr; 909 struct elf_link_hash_entry **sym_hashes; 910 const Elf_Internal_Rela *rel; 911 const Elf_Internal_Rela *rel_end; 912 asection *sreloc; 913 bfd_signed_vma *local_got_refcounts; 914 int tls_type, old_tls_type; 915 916 if (info->relocatable) 917 return TRUE; 918 919 htab = elf_s390_hash_table (info); 920 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 921 sym_hashes = elf_sym_hashes (abfd); 922 local_got_refcounts = elf_local_got_refcounts (abfd); 923 924 sreloc = NULL; 925 926 rel_end = relocs + sec->reloc_count; 927 for (rel = relocs; rel < rel_end; rel++) 928 { 929 unsigned int r_type; 930 unsigned long r_symndx; 931 struct elf_link_hash_entry *h; 932 933 r_symndx = ELF64_R_SYM (rel->r_info); 934 935 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 936 { 937 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 938 abfd, 939 r_symndx); 940 return FALSE; 941 } 942 943 if (r_symndx < symtab_hdr->sh_info) 944 h = NULL; 945 else 946 { 947 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 948 while (h->root.type == bfd_link_hash_indirect 949 || h->root.type == bfd_link_hash_warning) 950 h = (struct elf_link_hash_entry *) h->root.u.i.link; 951 } 952 953 /* Create got section and local_got_refcounts array if they 954 are needed. */ 955 r_type = elf_s390_tls_transition (info, 956 ELF64_R_TYPE (rel->r_info), 957 h == NULL); 958 switch (r_type) 959 { 960 case R_390_GOT12: 961 case R_390_GOT16: 962 case R_390_GOT20: 963 case R_390_GOT32: 964 case R_390_GOT64: 965 case R_390_GOTENT: 966 case R_390_GOTPLT12: 967 case R_390_GOTPLT16: 968 case R_390_GOTPLT20: 969 case R_390_GOTPLT32: 970 case R_390_GOTPLT64: 971 case R_390_GOTPLTENT: 972 case R_390_TLS_GD64: 973 case R_390_TLS_GOTIE12: 974 case R_390_TLS_GOTIE20: 975 case R_390_TLS_GOTIE64: 976 case R_390_TLS_IEENT: 977 case R_390_TLS_IE64: 978 case R_390_TLS_LDM64: 979 if (h == NULL 980 && local_got_refcounts == NULL) 981 { 982 bfd_size_type size; 983 984 size = symtab_hdr->sh_info; 985 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 986 local_got_refcounts = ((bfd_signed_vma *) 987 bfd_zalloc (abfd, size)); 988 if (local_got_refcounts == NULL) 989 return FALSE; 990 elf_local_got_refcounts (abfd) = local_got_refcounts; 991 elf_s390_local_got_tls_type (abfd) 992 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 993 } 994 /* Fall through. */ 995 case R_390_GOTOFF16: 996 case R_390_GOTOFF32: 997 case R_390_GOTOFF64: 998 case R_390_GOTPC: 999 case R_390_GOTPCDBL: 1000 if (htab->sgot == NULL) 1001 { 1002 if (htab->elf.dynobj == NULL) 1003 htab->elf.dynobj = abfd; 1004 if (!create_got_section (htab->elf.dynobj, info)) 1005 return FALSE; 1006 } 1007 } 1008 1009 switch (r_type) 1010 { 1011 case R_390_GOTOFF16: 1012 case R_390_GOTOFF32: 1013 case R_390_GOTOFF64: 1014 case R_390_GOTPC: 1015 case R_390_GOTPCDBL: 1016 /* Got is created, nothing to be done. */ 1017 break; 1018 1019 case R_390_PLT16DBL: 1020 case R_390_PLT32: 1021 case R_390_PLT32DBL: 1022 case R_390_PLT64: 1023 case R_390_PLTOFF16: 1024 case R_390_PLTOFF32: 1025 case R_390_PLTOFF64: 1026 /* This symbol requires a procedure linkage table entry. We 1027 actually build the entry in adjust_dynamic_symbol, 1028 because this might be a case of linking PIC code which is 1029 never referenced by a dynamic object, in which case we 1030 don't need to generate a procedure linkage table entry 1031 after all. */ 1032 1033 /* If this is a local symbol, we resolve it directly without 1034 creating a procedure linkage table entry. */ 1035 if (h != NULL) 1036 { 1037 h->needs_plt = 1; 1038 h->plt.refcount += 1; 1039 } 1040 break; 1041 1042 case R_390_GOTPLT12: 1043 case R_390_GOTPLT16: 1044 case R_390_GOTPLT20: 1045 case R_390_GOTPLT32: 1046 case R_390_GOTPLT64: 1047 case R_390_GOTPLTENT: 1048 /* This symbol requires either a procedure linkage table entry 1049 or an entry in the local got. We actually build the entry 1050 in adjust_dynamic_symbol because whether this is really a 1051 global reference can change and with it the fact if we have 1052 to create a plt entry or a local got entry. To be able to 1053 make a once global symbol a local one we have to keep track 1054 of the number of gotplt references that exist for this 1055 symbol. */ 1056 if (h != NULL) 1057 { 1058 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1059 h->needs_plt = 1; 1060 h->plt.refcount += 1; 1061 } 1062 else 1063 local_got_refcounts[r_symndx] += 1; 1064 break; 1065 1066 case R_390_TLS_LDM64: 1067 htab->tls_ldm_got.refcount += 1; 1068 break; 1069 1070 case R_390_TLS_IE64: 1071 case R_390_TLS_GOTIE12: 1072 case R_390_TLS_GOTIE20: 1073 case R_390_TLS_GOTIE64: 1074 case R_390_TLS_IEENT: 1075 if (info->shared) 1076 info->flags |= DF_STATIC_TLS; 1077 /* Fall through */ 1078 1079 case R_390_GOT12: 1080 case R_390_GOT16: 1081 case R_390_GOT20: 1082 case R_390_GOT32: 1083 case R_390_GOT64: 1084 case R_390_GOTENT: 1085 case R_390_TLS_GD64: 1086 /* This symbol requires a global offset table entry. */ 1087 switch (r_type) 1088 { 1089 default: 1090 case R_390_GOT12: 1091 case R_390_GOT16: 1092 case R_390_GOT20: 1093 case R_390_GOT32: 1094 case R_390_GOTENT: 1095 tls_type = GOT_NORMAL; 1096 break; 1097 case R_390_TLS_GD64: 1098 tls_type = GOT_TLS_GD; 1099 break; 1100 case R_390_TLS_IE64: 1101 case R_390_TLS_GOTIE64: 1102 tls_type = GOT_TLS_IE; 1103 break; 1104 case R_390_TLS_GOTIE12: 1105 case R_390_TLS_GOTIE20: 1106 case R_390_TLS_IEENT: 1107 tls_type = GOT_TLS_IE_NLT; 1108 break; 1109 } 1110 1111 if (h != NULL) 1112 { 1113 h->got.refcount += 1; 1114 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1115 } 1116 else 1117 { 1118 local_got_refcounts[r_symndx] += 1; 1119 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1120 } 1121 /* If a TLS symbol is accessed using IE at least once, 1122 there is no point to use dynamic model for it. */ 1123 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1124 { 1125 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1126 { 1127 (*_bfd_error_handler) 1128 (_("%B: `%s' accessed both as normal and thread local symbol"), 1129 abfd, h->root.root.string); 1130 return FALSE; 1131 } 1132 if (old_tls_type > tls_type) 1133 tls_type = old_tls_type; 1134 } 1135 1136 if (old_tls_type != tls_type) 1137 { 1138 if (h != NULL) 1139 elf_s390_hash_entry (h)->tls_type = tls_type; 1140 else 1141 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1142 } 1143 1144 if (r_type != R_390_TLS_IE64) 1145 break; 1146 /* Fall through */ 1147 1148 case R_390_TLS_LE64: 1149 if (!info->shared) 1150 break; 1151 info->flags |= DF_STATIC_TLS; 1152 /* Fall through */ 1153 1154 case R_390_8: 1155 case R_390_16: 1156 case R_390_32: 1157 case R_390_64: 1158 case R_390_PC16: 1159 case R_390_PC16DBL: 1160 case R_390_PC32: 1161 case R_390_PC32DBL: 1162 case R_390_PC64: 1163 if (h != NULL && !info->shared) 1164 { 1165 /* If this reloc is in a read-only section, we might 1166 need a copy reloc. We can't check reliably at this 1167 stage whether the section is read-only, as input 1168 sections have not yet been mapped to output sections. 1169 Tentatively set the flag for now, and correct in 1170 adjust_dynamic_symbol. */ 1171 h->non_got_ref = 1; 1172 1173 /* We may need a .plt entry if the function this reloc 1174 refers to is in a shared lib. */ 1175 h->plt.refcount += 1; 1176 } 1177 1178 /* If we are creating a shared library, and this is a reloc 1179 against a global symbol, or a non PC relative reloc 1180 against a local symbol, then we need to copy the reloc 1181 into the shared library. However, if we are linking with 1182 -Bsymbolic, we do not need to copy a reloc against a 1183 global symbol which is defined in an object we are 1184 including in the link (i.e., DEF_REGULAR is set). At 1185 this point we have not seen all the input files, so it is 1186 possible that DEF_REGULAR is not set now but will be set 1187 later (it is never cleared). In case of a weak definition, 1188 DEF_REGULAR may be cleared later by a strong definition in 1189 a shared library. We account for that possibility below by 1190 storing information in the relocs_copied field of the hash 1191 table entry. A similar situation occurs when creating 1192 shared libraries and symbol visibility changes render the 1193 symbol local. 1194 1195 If on the other hand, we are creating an executable, we 1196 may need to keep relocations for symbols satisfied by a 1197 dynamic library if we manage to avoid copy relocs for the 1198 symbol. */ 1199 if ((info->shared 1200 && (sec->flags & SEC_ALLOC) != 0 1201 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 1202 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL 1203 && ELF64_R_TYPE (rel->r_info) != R_390_PC32 1204 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL 1205 && ELF64_R_TYPE (rel->r_info) != R_390_PC64) 1206 || (h != NULL 1207 && (! info->symbolic 1208 || h->root.type == bfd_link_hash_defweak 1209 || !h->def_regular)))) 1210 || (ELIMINATE_COPY_RELOCS 1211 && !info->shared 1212 && (sec->flags & SEC_ALLOC) != 0 1213 && h != NULL 1214 && (h->root.type == bfd_link_hash_defweak 1215 || !h->def_regular))) 1216 { 1217 struct elf_s390_dyn_relocs *p; 1218 struct elf_s390_dyn_relocs **head; 1219 1220 /* We must copy these reloc types into the output file. 1221 Create a reloc section in dynobj and make room for 1222 this reloc. */ 1223 if (sreloc == NULL) 1224 { 1225 const char *name; 1226 bfd *dynobj; 1227 1228 name = (bfd_elf_string_from_elf_section 1229 (abfd, 1230 elf_elfheader (abfd)->e_shstrndx, 1231 elf_section_data (sec)->rel_hdr.sh_name)); 1232 if (name == NULL) 1233 return FALSE; 1234 1235 if (! CONST_STRNEQ (name, ".rela") 1236 || strcmp (bfd_get_section_name (abfd, sec), 1237 name + 5) != 0) 1238 { 1239 (*_bfd_error_handler) 1240 (_("%B: bad relocation section name `%s\'"), 1241 abfd, name); 1242 } 1243 1244 if (htab->elf.dynobj == NULL) 1245 htab->elf.dynobj = abfd; 1246 1247 dynobj = htab->elf.dynobj; 1248 sreloc = bfd_get_section_by_name (dynobj, name); 1249 if (sreloc == NULL) 1250 { 1251 flagword flags; 1252 1253 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1254 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1255 if ((sec->flags & SEC_ALLOC) != 0) 1256 flags |= SEC_ALLOC | SEC_LOAD; 1257 sreloc = bfd_make_section_with_flags (dynobj, 1258 name, 1259 flags); 1260 if (sreloc == NULL 1261 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 1262 return FALSE; 1263 } 1264 elf_section_data (sec)->sreloc = sreloc; 1265 } 1266 1267 /* If this is a global symbol, we count the number of 1268 relocations we need for this symbol. */ 1269 if (h != NULL) 1270 { 1271 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1272 } 1273 else 1274 { 1275 /* Track dynamic relocs needed for local syms too. 1276 We really need local syms available to do this 1277 easily. Oh well. */ 1278 1279 asection *s; 1280 void *vpp; 1281 1282 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1283 sec, r_symndx); 1284 if (s == NULL) 1285 return FALSE; 1286 1287 vpp = &elf_section_data (s)->local_dynrel; 1288 head = (struct elf_s390_dyn_relocs **) vpp; 1289 } 1290 1291 p = *head; 1292 if (p == NULL || p->sec != sec) 1293 { 1294 bfd_size_type amt = sizeof *p; 1295 p = ((struct elf_s390_dyn_relocs *) 1296 bfd_alloc (htab->elf.dynobj, amt)); 1297 if (p == NULL) 1298 return FALSE; 1299 p->next = *head; 1300 *head = p; 1301 p->sec = sec; 1302 p->count = 0; 1303 p->pc_count = 0; 1304 } 1305 1306 p->count += 1; 1307 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 1308 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1309 || ELF64_R_TYPE (rel->r_info) == R_390_PC32 1310 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL 1311 || ELF64_R_TYPE (rel->r_info) == R_390_PC64) 1312 p->pc_count += 1; 1313 } 1314 break; 1315 1316 /* This relocation describes the C++ object vtable hierarchy. 1317 Reconstruct it for later use during GC. */ 1318 case R_390_GNU_VTINHERIT: 1319 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1320 return FALSE; 1321 break; 1322 1323 /* This relocation describes which C++ vtable entries are actually 1324 used. Record for later use during GC. */ 1325 case R_390_GNU_VTENTRY: 1326 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1327 return FALSE; 1328 break; 1329 1330 default: 1331 break; 1332 } 1333 } 1334 1335 return TRUE; 1336} 1337 1338/* Return the section that should be marked against GC for a given 1339 relocation. */ 1340 1341static asection * 1342elf_s390_gc_mark_hook (asection *sec, 1343 struct bfd_link_info *info, 1344 Elf_Internal_Rela *rel, 1345 struct elf_link_hash_entry *h, 1346 Elf_Internal_Sym *sym) 1347{ 1348 if (h != NULL) 1349 switch (ELF64_R_TYPE (rel->r_info)) 1350 { 1351 case R_390_GNU_VTINHERIT: 1352 case R_390_GNU_VTENTRY: 1353 return NULL; 1354 } 1355 1356 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1357} 1358 1359/* Update the got entry reference counts for the section being removed. */ 1360 1361static bfd_boolean 1362elf_s390_gc_sweep_hook (bfd *abfd, 1363 struct bfd_link_info *info, 1364 asection *sec, 1365 const Elf_Internal_Rela *relocs) 1366{ 1367 Elf_Internal_Shdr *symtab_hdr; 1368 struct elf_link_hash_entry **sym_hashes; 1369 bfd_signed_vma *local_got_refcounts; 1370 const Elf_Internal_Rela *rel, *relend; 1371 1372 elf_section_data (sec)->local_dynrel = NULL; 1373 1374 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1375 sym_hashes = elf_sym_hashes (abfd); 1376 local_got_refcounts = elf_local_got_refcounts (abfd); 1377 1378 relend = relocs + sec->reloc_count; 1379 for (rel = relocs; rel < relend; rel++) 1380 { 1381 unsigned long r_symndx; 1382 unsigned int r_type; 1383 struct elf_link_hash_entry *h = NULL; 1384 1385 r_symndx = ELF64_R_SYM (rel->r_info); 1386 if (r_symndx >= symtab_hdr->sh_info) 1387 { 1388 struct elf_s390_link_hash_entry *eh; 1389 struct elf_s390_dyn_relocs **pp; 1390 struct elf_s390_dyn_relocs *p; 1391 1392 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1393 while (h->root.type == bfd_link_hash_indirect 1394 || h->root.type == bfd_link_hash_warning) 1395 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1396 eh = (struct elf_s390_link_hash_entry *) h; 1397 1398 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1399 if (p->sec == sec) 1400 { 1401 /* Everything must go for SEC. */ 1402 *pp = p->next; 1403 break; 1404 } 1405 } 1406 1407 r_type = ELF64_R_TYPE (rel->r_info); 1408 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1409 switch (r_type) 1410 { 1411 case R_390_TLS_LDM64: 1412 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1413 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1414 break; 1415 1416 case R_390_TLS_GD64: 1417 case R_390_TLS_IE64: 1418 case R_390_TLS_GOTIE12: 1419 case R_390_TLS_GOTIE20: 1420 case R_390_TLS_GOTIE64: 1421 case R_390_TLS_IEENT: 1422 case R_390_GOT12: 1423 case R_390_GOT16: 1424 case R_390_GOT20: 1425 case R_390_GOT32: 1426 case R_390_GOT64: 1427 case R_390_GOTOFF16: 1428 case R_390_GOTOFF32: 1429 case R_390_GOTOFF64: 1430 case R_390_GOTPC: 1431 case R_390_GOTPCDBL: 1432 case R_390_GOTENT: 1433 if (h != NULL) 1434 { 1435 if (h->got.refcount > 0) 1436 h->got.refcount -= 1; 1437 } 1438 else if (local_got_refcounts != NULL) 1439 { 1440 if (local_got_refcounts[r_symndx] > 0) 1441 local_got_refcounts[r_symndx] -= 1; 1442 } 1443 break; 1444 1445 case R_390_8: 1446 case R_390_12: 1447 case R_390_16: 1448 case R_390_20: 1449 case R_390_32: 1450 case R_390_64: 1451 case R_390_PC16: 1452 case R_390_PC16DBL: 1453 case R_390_PC32: 1454 case R_390_PC32DBL: 1455 case R_390_PC64: 1456 if (info->shared) 1457 break; 1458 /* Fall through */ 1459 1460 case R_390_PLT16DBL: 1461 case R_390_PLT32: 1462 case R_390_PLT32DBL: 1463 case R_390_PLT64: 1464 case R_390_PLTOFF16: 1465 case R_390_PLTOFF32: 1466 case R_390_PLTOFF64: 1467 if (h != NULL) 1468 { 1469 if (h->plt.refcount > 0) 1470 h->plt.refcount -= 1; 1471 } 1472 break; 1473 1474 case R_390_GOTPLT12: 1475 case R_390_GOTPLT16: 1476 case R_390_GOTPLT20: 1477 case R_390_GOTPLT32: 1478 case R_390_GOTPLT64: 1479 case R_390_GOTPLTENT: 1480 if (h != NULL) 1481 { 1482 if (h->plt.refcount > 0) 1483 { 1484 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1485 h->plt.refcount -= 1; 1486 } 1487 } 1488 else if (local_got_refcounts != NULL) 1489 { 1490 if (local_got_refcounts[r_symndx] > 0) 1491 local_got_refcounts[r_symndx] -= 1; 1492 } 1493 break; 1494 1495 default: 1496 break; 1497 } 1498 } 1499 1500 return TRUE; 1501} 1502 1503/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1504 entry but we found we will not create any. Called when we find we will 1505 not have any PLT for this symbol, by for example 1506 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1507 or elf_s390_size_dynamic_sections if no dynamic sections will be 1508 created (we're only linking static objects). */ 1509 1510static void 1511elf_s390_adjust_gotplt (h) 1512 struct elf_s390_link_hash_entry *h; 1513{ 1514 if (h->elf.root.type == bfd_link_hash_warning) 1515 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1516 1517 if (h->gotplt_refcount <= 0) 1518 return; 1519 1520 /* We simply add the number of gotplt references to the number 1521 * of got references for this symbol. */ 1522 h->elf.got.refcount += h->gotplt_refcount; 1523 h->gotplt_refcount = -1; 1524} 1525 1526/* Adjust a symbol defined by a dynamic object and referenced by a 1527 regular object. The current definition is in some section of the 1528 dynamic object, but we're not including those sections. We have to 1529 change the definition to something the rest of the link can 1530 understand. */ 1531 1532static bfd_boolean 1533elf_s390_adjust_dynamic_symbol (info, h) 1534 struct bfd_link_info *info; 1535 struct elf_link_hash_entry *h; 1536{ 1537 struct elf_s390_link_hash_table *htab; 1538 asection *s; 1539 unsigned int power_of_two; 1540 1541 /* If this is a function, put it in the procedure linkage table. We 1542 will fill in the contents of the procedure linkage table later 1543 (although we could actually do it here). */ 1544 if (h->type == STT_FUNC 1545 || h->needs_plt) 1546 { 1547 if (h->plt.refcount <= 0 1548 || (! info->shared 1549 && !h->def_dynamic 1550 && !h->ref_dynamic 1551 && h->root.type != bfd_link_hash_undefweak 1552 && h->root.type != bfd_link_hash_undefined)) 1553 { 1554 /* This case can occur if we saw a PLT32 reloc in an input 1555 file, but the symbol was never referred to by a dynamic 1556 object, or if all references were garbage collected. In 1557 such a case, we don't actually need to build a procedure 1558 linkage table, and we can just do a PC32 reloc instead. */ 1559 h->plt.offset = (bfd_vma) -1; 1560 h->needs_plt = 0; 1561 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1562 } 1563 1564 return TRUE; 1565 } 1566 else 1567 /* It's possible that we incorrectly decided a .plt reloc was 1568 needed for an R_390_PC32 reloc to a non-function sym in 1569 check_relocs. We can't decide accurately between function and 1570 non-function syms in check-relocs; Objects loaded later in 1571 the link may change h->type. So fix it now. */ 1572 h->plt.offset = (bfd_vma) -1; 1573 1574 /* If this is a weak symbol, and there is a real definition, the 1575 processor independent code will have arranged for us to see the 1576 real definition first, and we can just use the same value. */ 1577 if (h->u.weakdef != NULL) 1578 { 1579 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1580 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1581 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1582 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1583 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1584 h->non_got_ref = h->u.weakdef->non_got_ref; 1585 return TRUE; 1586 } 1587 1588 /* This is a reference to a symbol defined by a dynamic object which 1589 is not a function. */ 1590 1591 /* If we are creating a shared library, we must presume that the 1592 only references to the symbol are via the global offset table. 1593 For such cases we need not do anything here; the relocations will 1594 be handled correctly by relocate_section. */ 1595 if (info->shared) 1596 return TRUE; 1597 1598 /* If there are no references to this symbol that do not use the 1599 GOT, we don't need to generate a copy reloc. */ 1600 if (!h->non_got_ref) 1601 return TRUE; 1602 1603 /* If -z nocopyreloc was given, we won't generate them either. */ 1604 if (info->nocopyreloc) 1605 { 1606 h->non_got_ref = 0; 1607 return TRUE; 1608 } 1609 1610 if (ELIMINATE_COPY_RELOCS) 1611 { 1612 struct elf_s390_link_hash_entry * eh; 1613 struct elf_s390_dyn_relocs *p; 1614 1615 eh = (struct elf_s390_link_hash_entry *) h; 1616 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1617 { 1618 s = p->sec->output_section; 1619 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1620 break; 1621 } 1622 1623 /* If we didn't find any dynamic relocs in read-only sections, then 1624 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1625 if (p == NULL) 1626 { 1627 h->non_got_ref = 0; 1628 return TRUE; 1629 } 1630 } 1631 1632 if (h->size == 0) 1633 { 1634 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1635 h->root.root.string); 1636 return TRUE; 1637 } 1638 1639 /* We must allocate the symbol in our .dynbss section, which will 1640 become part of the .bss section of the executable. There will be 1641 an entry for this symbol in the .dynsym section. The dynamic 1642 object will contain position independent code, so all references 1643 from the dynamic object to this symbol will go through the global 1644 offset table. The dynamic linker will use the .dynsym entry to 1645 determine the address it must put in the global offset table, so 1646 both the dynamic object and the regular object will refer to the 1647 same memory location for the variable. */ 1648 1649 htab = elf_s390_hash_table (info); 1650 1651 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1652 copy the initial value out of the dynamic object and into the 1653 runtime process image. */ 1654 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1655 { 1656 htab->srelbss->size += sizeof (Elf64_External_Rela); 1657 h->needs_copy = 1; 1658 } 1659 1660 /* We need to figure out the alignment required for this symbol. I 1661 have no idea how ELF linkers handle this. */ 1662 power_of_two = bfd_log2 (h->size); 1663 if (power_of_two > 3) 1664 power_of_two = 3; 1665 1666 /* Apply the required alignment. */ 1667 s = htab->sdynbss; 1668 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 1669 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1670 { 1671 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1672 return FALSE; 1673 } 1674 1675 /* Define the symbol as being at this point in the section. */ 1676 h->root.u.def.section = s; 1677 h->root.u.def.value = s->size; 1678 1679 /* Increment the section size to make room for the symbol. */ 1680 s->size += h->size; 1681 1682 return TRUE; 1683} 1684 1685/* Allocate space in .plt, .got and associated reloc sections for 1686 dynamic relocs. */ 1687 1688static bfd_boolean 1689allocate_dynrelocs (h, inf) 1690 struct elf_link_hash_entry *h; 1691 PTR inf; 1692{ 1693 struct bfd_link_info *info; 1694 struct elf_s390_link_hash_table *htab; 1695 struct elf_s390_link_hash_entry *eh; 1696 struct elf_s390_dyn_relocs *p; 1697 1698 if (h->root.type == bfd_link_hash_indirect) 1699 return TRUE; 1700 1701 if (h->root.type == bfd_link_hash_warning) 1702 /* When warning symbols are created, they **replace** the "real" 1703 entry in the hash table, thus we never get to see the real 1704 symbol in a hash traversal. So look at it now. */ 1705 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1706 1707 info = (struct bfd_link_info *) inf; 1708 htab = elf_s390_hash_table (info); 1709 1710 if (htab->elf.dynamic_sections_created 1711 && h->plt.refcount > 0 1712 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1713 || h->root.type != bfd_link_hash_undefweak)) 1714 { 1715 /* Make sure this symbol is output as a dynamic symbol. 1716 Undefined weak syms won't yet be marked as dynamic. */ 1717 if (h->dynindx == -1 1718 && !h->forced_local) 1719 { 1720 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1721 return FALSE; 1722 } 1723 1724 if (info->shared 1725 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1726 { 1727 asection *s = htab->splt; 1728 1729 /* If this is the first .plt entry, make room for the special 1730 first entry. */ 1731 if (s->size == 0) 1732 s->size += PLT_FIRST_ENTRY_SIZE; 1733 1734 h->plt.offset = s->size; 1735 1736 /* If this symbol is not defined in a regular file, and we are 1737 not generating a shared library, then set the symbol to this 1738 location in the .plt. This is required to make function 1739 pointers compare as equal between the normal executable and 1740 the shared library. */ 1741 if (! info->shared 1742 && !h->def_regular) 1743 { 1744 h->root.u.def.section = s; 1745 h->root.u.def.value = h->plt.offset; 1746 } 1747 1748 /* Make room for this entry. */ 1749 s->size += PLT_ENTRY_SIZE; 1750 1751 /* We also need to make an entry in the .got.plt section, which 1752 will be placed in the .got section by the linker script. */ 1753 htab->sgotplt->size += GOT_ENTRY_SIZE; 1754 1755 /* We also need to make an entry in the .rela.plt section. */ 1756 htab->srelplt->size += sizeof (Elf64_External_Rela); 1757 } 1758 else 1759 { 1760 h->plt.offset = (bfd_vma) -1; 1761 h->needs_plt = 0; 1762 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1763 } 1764 } 1765 else 1766 { 1767 h->plt.offset = (bfd_vma) -1; 1768 h->needs_plt = 0; 1769 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1770 } 1771 1772 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to 1773 the binary, we can optimize a bit. IE64 and GOTIE64 get converted 1774 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT 1775 we can save the dynamic TLS relocation. */ 1776 if (h->got.refcount > 0 1777 && !info->shared 1778 && h->dynindx == -1 1779 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1780 { 1781 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1782 /* For the GOTIE access without a literal pool entry the offset has 1783 to be stored somewhere. The immediate value in the instruction 1784 is not bit enough so the value is stored in the got. */ 1785 { 1786 h->got.offset = htab->sgot->size; 1787 htab->sgot->size += GOT_ENTRY_SIZE; 1788 } 1789 else 1790 h->got.offset = (bfd_vma) -1; 1791 } 1792 else if (h->got.refcount > 0) 1793 { 1794 asection *s; 1795 bfd_boolean dyn; 1796 int tls_type = elf_s390_hash_entry(h)->tls_type; 1797 1798 /* Make sure this symbol is output as a dynamic symbol. 1799 Undefined weak syms won't yet be marked as dynamic. */ 1800 if (h->dynindx == -1 1801 && !h->forced_local) 1802 { 1803 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1804 return FALSE; 1805 } 1806 1807 s = htab->sgot; 1808 h->got.offset = s->size; 1809 s->size += GOT_ENTRY_SIZE; 1810 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */ 1811 if (tls_type == GOT_TLS_GD) 1812 s->size += GOT_ENTRY_SIZE; 1813 dyn = htab->elf.dynamic_sections_created; 1814 /* R_390_TLS_IE64 needs one dynamic relocation, 1815 R_390_TLS_GD64 needs one if local symbol and two if global. */ 1816 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1817 || tls_type >= GOT_TLS_IE) 1818 htab->srelgot->size += sizeof (Elf64_External_Rela); 1819 else if (tls_type == GOT_TLS_GD) 1820 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela); 1821 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1822 || h->root.type != bfd_link_hash_undefweak) 1823 && (info->shared 1824 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1825 htab->srelgot->size += sizeof (Elf64_External_Rela); 1826 } 1827 else 1828 h->got.offset = (bfd_vma) -1; 1829 1830 eh = (struct elf_s390_link_hash_entry *) h; 1831 if (eh->dyn_relocs == NULL) 1832 return TRUE; 1833 1834 /* In the shared -Bsymbolic case, discard space allocated for 1835 dynamic pc-relative relocs against symbols which turn out to be 1836 defined in regular objects. For the normal shared case, discard 1837 space for pc-relative relocs that have become local due to symbol 1838 visibility changes. */ 1839 1840 if (info->shared) 1841 { 1842 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1843 { 1844 struct elf_s390_dyn_relocs **pp; 1845 1846 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1847 { 1848 p->count -= p->pc_count; 1849 p->pc_count = 0; 1850 if (p->count == 0) 1851 *pp = p->next; 1852 else 1853 pp = &p->next; 1854 } 1855 } 1856 1857 /* Also discard relocs on undefined weak syms with non-default 1858 visibility. */ 1859 if (eh->dyn_relocs != NULL 1860 && h->root.type == bfd_link_hash_undefweak) 1861 { 1862 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1863 eh->dyn_relocs = NULL; 1864 1865 /* Make sure undefined weak symbols are output as a dynamic 1866 symbol in PIEs. */ 1867 else if (h->dynindx == -1 1868 && !h->forced_local) 1869 { 1870 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1871 return FALSE; 1872 } 1873 } 1874 } 1875 else if (ELIMINATE_COPY_RELOCS) 1876 { 1877 /* For the non-shared case, discard space for relocs against 1878 symbols which turn out to need copy relocs or are not 1879 dynamic. */ 1880 1881 if (!h->non_got_ref 1882 && ((h->def_dynamic 1883 && !h->def_regular) 1884 || (htab->elf.dynamic_sections_created 1885 && (h->root.type == bfd_link_hash_undefweak 1886 || h->root.type == bfd_link_hash_undefined)))) 1887 { 1888 /* Make sure this symbol is output as a dynamic symbol. 1889 Undefined weak syms won't yet be marked as dynamic. */ 1890 if (h->dynindx == -1 1891 && !h->forced_local) 1892 { 1893 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1894 return FALSE; 1895 } 1896 1897 /* If that succeeded, we know we'll be keeping all the 1898 relocs. */ 1899 if (h->dynindx != -1) 1900 goto keep; 1901 } 1902 1903 eh->dyn_relocs = NULL; 1904 1905 keep: ; 1906 } 1907 1908 /* Finally, allocate space. */ 1909 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1910 { 1911 asection *sreloc = elf_section_data (p->sec)->sreloc; 1912 sreloc->size += p->count * sizeof (Elf64_External_Rela); 1913 } 1914 1915 return TRUE; 1916} 1917 1918/* Find any dynamic relocs that apply to read-only sections. */ 1919 1920static bfd_boolean 1921readonly_dynrelocs (h, inf) 1922 struct elf_link_hash_entry *h; 1923 PTR inf; 1924{ 1925 struct elf_s390_link_hash_entry *eh; 1926 struct elf_s390_dyn_relocs *p; 1927 1928 if (h->root.type == bfd_link_hash_warning) 1929 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1930 1931 eh = (struct elf_s390_link_hash_entry *) h; 1932 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1933 { 1934 asection *s = p->sec->output_section; 1935 1936 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1937 { 1938 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1939 1940 info->flags |= DF_TEXTREL; 1941 1942 /* Not an error, just cut short the traversal. */ 1943 return FALSE; 1944 } 1945 } 1946 return TRUE; 1947} 1948 1949/* Set the sizes of the dynamic sections. */ 1950 1951static bfd_boolean 1952elf_s390_size_dynamic_sections (output_bfd, info) 1953 bfd *output_bfd ATTRIBUTE_UNUSED; 1954 struct bfd_link_info *info; 1955{ 1956 struct elf_s390_link_hash_table *htab; 1957 bfd *dynobj; 1958 asection *s; 1959 bfd_boolean relocs; 1960 bfd *ibfd; 1961 1962 htab = elf_s390_hash_table (info); 1963 dynobj = htab->elf.dynobj; 1964 if (dynobj == NULL) 1965 abort (); 1966 1967 if (htab->elf.dynamic_sections_created) 1968 { 1969 /* Set the contents of the .interp section to the interpreter. */ 1970 if (info->executable) 1971 { 1972 s = bfd_get_section_by_name (dynobj, ".interp"); 1973 if (s == NULL) 1974 abort (); 1975 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1976 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1977 } 1978 } 1979 1980 /* Set up .got offsets for local syms, and space for local dynamic 1981 relocs. */ 1982 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 1983 { 1984 bfd_signed_vma *local_got; 1985 bfd_signed_vma *end_local_got; 1986 char *local_tls_type; 1987 bfd_size_type locsymcount; 1988 Elf_Internal_Shdr *symtab_hdr; 1989 asection *srela; 1990 1991 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 1992 continue; 1993 1994 for (s = ibfd->sections; s != NULL; s = s->next) 1995 { 1996 struct elf_s390_dyn_relocs *p; 1997 1998 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 1999 { 2000 if (!bfd_is_abs_section (p->sec) 2001 && bfd_is_abs_section (p->sec->output_section)) 2002 { 2003 /* Input section has been discarded, either because 2004 it is a copy of a linkonce section or due to 2005 linker script /DISCARD/, so we'll be discarding 2006 the relocs too. */ 2007 } 2008 else if (p->count != 0) 2009 { 2010 srela = elf_section_data (p->sec)->sreloc; 2011 srela->size += p->count * sizeof (Elf64_External_Rela); 2012 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2013 info->flags |= DF_TEXTREL; 2014 } 2015 } 2016 } 2017 2018 local_got = elf_local_got_refcounts (ibfd); 2019 if (!local_got) 2020 continue; 2021 2022 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2023 locsymcount = symtab_hdr->sh_info; 2024 end_local_got = local_got + locsymcount; 2025 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2026 s = htab->sgot; 2027 srela = htab->srelgot; 2028 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2029 { 2030 if (*local_got > 0) 2031 { 2032 *local_got = s->size; 2033 s->size += GOT_ENTRY_SIZE; 2034 if (*local_tls_type == GOT_TLS_GD) 2035 s->size += GOT_ENTRY_SIZE; 2036 if (info->shared) 2037 srela->size += sizeof (Elf64_External_Rela); 2038 } 2039 else 2040 *local_got = (bfd_vma) -1; 2041 } 2042 } 2043 2044 if (htab->tls_ldm_got.refcount > 0) 2045 { 2046 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64 2047 relocs. */ 2048 htab->tls_ldm_got.offset = htab->sgot->size; 2049 htab->sgot->size += 2 * GOT_ENTRY_SIZE; 2050 htab->srelgot->size += sizeof (Elf64_External_Rela); 2051 } 2052 else 2053 htab->tls_ldm_got.offset = -1; 2054 2055 /* Allocate global sym .plt and .got entries, and space for global 2056 sym dynamic relocs. */ 2057 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 2058 2059 /* We now have determined the sizes of the various dynamic sections. 2060 Allocate memory for them. */ 2061 relocs = FALSE; 2062 for (s = dynobj->sections; s != NULL; s = s->next) 2063 { 2064 if ((s->flags & SEC_LINKER_CREATED) == 0) 2065 continue; 2066 2067 if (s == htab->splt 2068 || s == htab->sgot 2069 || s == htab->sgotplt 2070 || s == htab->sdynbss) 2071 { 2072 /* Strip this section if we don't need it; see the 2073 comment below. */ 2074 } 2075 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2076 { 2077 if (s->size != 0 && s != htab->srelplt) 2078 relocs = TRUE; 2079 2080 /* We use the reloc_count field as a counter if we need 2081 to copy relocs into the output file. */ 2082 s->reloc_count = 0; 2083 } 2084 else 2085 { 2086 /* It's not one of our sections, so don't allocate space. */ 2087 continue; 2088 } 2089 2090 if (s->size == 0) 2091 { 2092 /* If we don't need this section, strip it from the 2093 output file. This is to handle .rela.bss and 2094 .rela.plt. We must create it in 2095 create_dynamic_sections, because it must be created 2096 before the linker maps input sections to output 2097 sections. The linker does that before 2098 adjust_dynamic_symbol is called, and it is that 2099 function which decides whether anything needs to go 2100 into these sections. */ 2101 2102 s->flags |= SEC_EXCLUDE; 2103 continue; 2104 } 2105 2106 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2107 continue; 2108 2109 /* Allocate memory for the section contents. We use bfd_zalloc 2110 here in case unused entries are not reclaimed before the 2111 section's contents are written out. This should not happen, 2112 but this way if it does, we get a R_390_NONE reloc instead 2113 of garbage. */ 2114 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2115 if (s->contents == NULL) 2116 return FALSE; 2117 } 2118 2119 if (htab->elf.dynamic_sections_created) 2120 { 2121 /* Add some entries to the .dynamic section. We fill in the 2122 values later, in elf_s390_finish_dynamic_sections, but we 2123 must add the entries now so that we get the correct size for 2124 the .dynamic section. The DT_DEBUG entry is filled in by the 2125 dynamic linker and used by the debugger. */ 2126#define add_dynamic_entry(TAG, VAL) \ 2127 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2128 2129 if (info->executable) 2130 { 2131 if (!add_dynamic_entry (DT_DEBUG, 0)) 2132 return FALSE; 2133 } 2134 2135 if (htab->splt->size != 0) 2136 { 2137 if (!add_dynamic_entry (DT_PLTGOT, 0) 2138 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2139 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2140 || !add_dynamic_entry (DT_JMPREL, 0)) 2141 return FALSE; 2142 } 2143 2144 if (relocs) 2145 { 2146 if (!add_dynamic_entry (DT_RELA, 0) 2147 || !add_dynamic_entry (DT_RELASZ, 0) 2148 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 2149 return FALSE; 2150 2151 /* If any dynamic relocs apply to a read-only section, 2152 then we need a DT_TEXTREL entry. */ 2153 if ((info->flags & DF_TEXTREL) == 0) 2154 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2155 (PTR) info); 2156 2157 if ((info->flags & DF_TEXTREL) != 0) 2158 { 2159 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2160 return FALSE; 2161 } 2162 } 2163 } 2164#undef add_dynamic_entry 2165 2166 return TRUE; 2167} 2168 2169/* Return the base VMA address which should be subtracted from real addresses 2170 when resolving @dtpoff relocation. 2171 This is PT_TLS segment p_vaddr. */ 2172 2173static bfd_vma 2174dtpoff_base (info) 2175 struct bfd_link_info *info; 2176{ 2177 /* If tls_sec is NULL, we should have signalled an error already. */ 2178 if (elf_hash_table (info)->tls_sec == NULL) 2179 return 0; 2180 return elf_hash_table (info)->tls_sec->vma; 2181} 2182 2183/* Return the relocation value for @tpoff relocation 2184 if STT_TLS virtual address is ADDRESS. */ 2185 2186static bfd_vma 2187tpoff (info, address) 2188 struct bfd_link_info *info; 2189 bfd_vma address; 2190{ 2191 struct elf_link_hash_table *htab = elf_hash_table (info); 2192 2193 /* If tls_sec is NULL, we should have signalled an error already. */ 2194 if (htab->tls_sec == NULL) 2195 return 0; 2196 return htab->tls_size + htab->tls_sec->vma - address; 2197} 2198 2199/* Complain if TLS instruction relocation is against an invalid 2200 instruction. */ 2201 2202static void 2203invalid_tls_insn (input_bfd, input_section, rel) 2204 bfd *input_bfd; 2205 asection *input_section; 2206 Elf_Internal_Rela *rel; 2207{ 2208 reloc_howto_type *howto; 2209 2210 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info); 2211 (*_bfd_error_handler) 2212 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"), 2213 input_bfd, 2214 input_section, 2215 (long) rel->r_offset, 2216 howto->name); 2217 bfd_set_error (bfd_error_bad_value); 2218} 2219 2220/* Relocate a 390 ELF section. */ 2221 2222static bfd_boolean 2223elf_s390_relocate_section (output_bfd, info, input_bfd, input_section, 2224 contents, relocs, local_syms, local_sections) 2225 bfd *output_bfd; 2226 struct bfd_link_info *info; 2227 bfd *input_bfd; 2228 asection *input_section; 2229 bfd_byte *contents; 2230 Elf_Internal_Rela *relocs; 2231 Elf_Internal_Sym *local_syms; 2232 asection **local_sections; 2233{ 2234 struct elf_s390_link_hash_table *htab; 2235 Elf_Internal_Shdr *symtab_hdr; 2236 struct elf_link_hash_entry **sym_hashes; 2237 bfd_vma *local_got_offsets; 2238 Elf_Internal_Rela *rel; 2239 Elf_Internal_Rela *relend; 2240 2241 if (info->relocatable) 2242 return TRUE; 2243 2244 htab = elf_s390_hash_table (info); 2245 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2246 sym_hashes = elf_sym_hashes (input_bfd); 2247 local_got_offsets = elf_local_got_offsets (input_bfd); 2248 2249 rel = relocs; 2250 relend = relocs + input_section->reloc_count; 2251 for (; rel < relend; rel++) 2252 { 2253 unsigned int r_type; 2254 reloc_howto_type *howto; 2255 unsigned long r_symndx; 2256 struct elf_link_hash_entry *h; 2257 Elf_Internal_Sym *sym; 2258 asection *sec; 2259 bfd_vma off; 2260 bfd_vma relocation; 2261 bfd_boolean unresolved_reloc; 2262 bfd_reloc_status_type r; 2263 int tls_type; 2264 2265 r_type = ELF64_R_TYPE (rel->r_info); 2266 if (r_type == (int) R_390_GNU_VTINHERIT 2267 || r_type == (int) R_390_GNU_VTENTRY) 2268 continue; 2269 if (r_type >= (int) R_390_max) 2270 { 2271 bfd_set_error (bfd_error_bad_value); 2272 return FALSE; 2273 } 2274 2275 howto = elf_howto_table + r_type; 2276 r_symndx = ELF64_R_SYM (rel->r_info); 2277 2278 /* This is a final link. */ 2279 h = NULL; 2280 sym = NULL; 2281 sec = NULL; 2282 unresolved_reloc = FALSE; 2283 if (r_symndx < symtab_hdr->sh_info) 2284 { 2285 sym = local_syms + r_symndx; 2286 sec = local_sections[r_symndx]; 2287 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2288 } 2289 else 2290 { 2291 bfd_boolean warned ATTRIBUTE_UNUSED; 2292 2293 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2294 r_symndx, symtab_hdr, sym_hashes, 2295 h, sec, relocation, 2296 unresolved_reloc, warned); 2297 } 2298 2299 switch (r_type) 2300 { 2301 case R_390_GOTPLT12: 2302 case R_390_GOTPLT16: 2303 case R_390_GOTPLT20: 2304 case R_390_GOTPLT32: 2305 case R_390_GOTPLT64: 2306 case R_390_GOTPLTENT: 2307 /* There are three cases for a GOTPLT relocation. 1) The 2308 relocation is against the jump slot entry of a plt that 2309 will get emitted to the output file. 2) The relocation 2310 is against the jump slot of a plt entry that has been 2311 removed. elf_s390_adjust_gotplt has created a GOT entry 2312 as replacement. 3) The relocation is against a local symbol. 2313 Cases 2) and 3) are the same as the GOT relocation code 2314 so we just have to test for case 1 and fall through for 2315 the other two. */ 2316 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2317 { 2318 bfd_vma plt_index; 2319 2320 /* Calc. index no. 2321 Current offset - size first entry / entry size. */ 2322 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2323 PLT_ENTRY_SIZE; 2324 2325 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 2326 addr & GOT addr. */ 2327 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2328 unresolved_reloc = FALSE; 2329 2330 if (r_type == R_390_GOTPLTENT) 2331 relocation += htab->sgot->output_section->vma; 2332 break; 2333 } 2334 /* Fall through. */ 2335 2336 case R_390_GOT12: 2337 case R_390_GOT16: 2338 case R_390_GOT20: 2339 case R_390_GOT32: 2340 case R_390_GOT64: 2341 case R_390_GOTENT: 2342 /* Relocation is to the entry for this symbol in the global 2343 offset table. */ 2344 if (htab->sgot == NULL) 2345 abort (); 2346 2347 if (h != NULL) 2348 { 2349 bfd_boolean dyn; 2350 2351 off = h->got.offset; 2352 dyn = htab->elf.dynamic_sections_created; 2353 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2354 || (info->shared 2355 && (info->symbolic 2356 || h->dynindx == -1 2357 || h->forced_local) 2358 && h->def_regular) 2359 || (ELF_ST_VISIBILITY (h->other) 2360 && h->root.type == bfd_link_hash_undefweak)) 2361 { 2362 /* This is actually a static link, or it is a 2363 -Bsymbolic link and the symbol is defined 2364 locally, or the symbol was forced to be local 2365 because of a version file. We must initialize 2366 this entry in the global offset table. Since the 2367 offset must always be a multiple of 2, we use the 2368 least significant bit to record whether we have 2369 initialized it already. 2370 2371 When doing a dynamic link, we create a .rel.got 2372 relocation entry to initialize the value. This 2373 is done in the finish_dynamic_symbol routine. */ 2374 if ((off & 1) != 0) 2375 off &= ~1; 2376 else 2377 { 2378 bfd_put_64 (output_bfd, relocation, 2379 htab->sgot->contents + off); 2380 h->got.offset |= 1; 2381 } 2382 } 2383 else 2384 unresolved_reloc = FALSE; 2385 } 2386 else 2387 { 2388 if (local_got_offsets == NULL) 2389 abort (); 2390 2391 off = local_got_offsets[r_symndx]; 2392 2393 /* The offset must always be a multiple of 8. We use 2394 the least significant bit to record whether we have 2395 already generated the necessary reloc. */ 2396 if ((off & 1) != 0) 2397 off &= ~1; 2398 else 2399 { 2400 bfd_put_64 (output_bfd, relocation, 2401 htab->sgot->contents + off); 2402 2403 if (info->shared) 2404 { 2405 asection *s; 2406 Elf_Internal_Rela outrel; 2407 bfd_byte *loc; 2408 2409 s = htab->srelgot; 2410 if (s == NULL) 2411 abort (); 2412 2413 outrel.r_offset = (htab->sgot->output_section->vma 2414 + htab->sgot->output_offset 2415 + off); 2416 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2417 outrel.r_addend = relocation; 2418 loc = s->contents; 2419 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2420 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2421 } 2422 2423 local_got_offsets[r_symndx] |= 1; 2424 } 2425 } 2426 2427 if (off >= (bfd_vma) -2) 2428 abort (); 2429 2430 relocation = htab->sgot->output_offset + off; 2431 2432 /* For @GOTENT the relocation is against the offset between 2433 the instruction and the symbols entry in the GOT and not 2434 between the start of the GOT and the symbols entry. We 2435 add the vma of the GOT to get the correct value. */ 2436 if ( r_type == R_390_GOTENT 2437 || r_type == R_390_GOTPLTENT) 2438 relocation += htab->sgot->output_section->vma; 2439 2440 break; 2441 2442 case R_390_GOTOFF16: 2443 case R_390_GOTOFF32: 2444 case R_390_GOTOFF64: 2445 /* Relocation is relative to the start of the global offset 2446 table. */ 2447 2448 /* Note that sgot->output_offset is not involved in this 2449 calculation. We always want the start of .got. If we 2450 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2451 permitted by the ABI, we might have to change this 2452 calculation. */ 2453 relocation -= htab->sgot->output_section->vma; 2454 break; 2455 2456 case R_390_GOTPC: 2457 case R_390_GOTPCDBL: 2458 /* Use global offset table as symbol value. */ 2459 relocation = htab->sgot->output_section->vma; 2460 unresolved_reloc = FALSE; 2461 break; 2462 2463 case R_390_PLT16DBL: 2464 case R_390_PLT32: 2465 case R_390_PLT32DBL: 2466 case R_390_PLT64: 2467 /* Relocation is to the entry for this symbol in the 2468 procedure linkage table. */ 2469 2470 /* Resolve a PLT32 reloc against a local symbol directly, 2471 without using the procedure linkage table. */ 2472 if (h == NULL) 2473 break; 2474 2475 if (h->plt.offset == (bfd_vma) -1 2476 || htab->splt == NULL) 2477 { 2478 /* We didn't make a PLT entry for this symbol. This 2479 happens when statically linking PIC code, or when 2480 using -Bsymbolic. */ 2481 break; 2482 } 2483 2484 relocation = (htab->splt->output_section->vma 2485 + htab->splt->output_offset 2486 + h->plt.offset); 2487 unresolved_reloc = FALSE; 2488 break; 2489 2490 case R_390_PLTOFF16: 2491 case R_390_PLTOFF32: 2492 case R_390_PLTOFF64: 2493 /* Relocation is to the entry for this symbol in the 2494 procedure linkage table relative to the start of the GOT. */ 2495 2496 /* For local symbols or if we didn't make a PLT entry for 2497 this symbol resolve the symbol directly. */ 2498 if ( h == NULL 2499 || h->plt.offset == (bfd_vma) -1 2500 || htab->splt == NULL) 2501 { 2502 relocation -= htab->sgot->output_section->vma; 2503 break; 2504 } 2505 2506 relocation = (htab->splt->output_section->vma 2507 + htab->splt->output_offset 2508 + h->plt.offset 2509 - htab->sgot->output_section->vma); 2510 unresolved_reloc = FALSE; 2511 break; 2512 2513 case R_390_8: 2514 case R_390_16: 2515 case R_390_32: 2516 case R_390_64: 2517 case R_390_PC16: 2518 case R_390_PC16DBL: 2519 case R_390_PC32: 2520 case R_390_PC32DBL: 2521 case R_390_PC64: 2522 /* r_symndx will be zero only for relocs against symbols 2523 from removed linkonce sections, or sections discarded by 2524 a linker script. */ 2525 if (r_symndx == 0) 2526 { 2527 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 2528 break; 2529 } 2530 2531 if ((input_section->flags & SEC_ALLOC) == 0) 2532 break; 2533 2534 if ((info->shared 2535 && (h == NULL 2536 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2537 || h->root.type != bfd_link_hash_undefweak) 2538 && ((r_type != R_390_PC16 2539 && r_type != R_390_PC16DBL 2540 && r_type != R_390_PC32 2541 && r_type != R_390_PC32DBL 2542 && r_type != R_390_PC64) 2543 || (h != NULL 2544 && !SYMBOL_REFERENCES_LOCAL (info, h)))) 2545 || (ELIMINATE_COPY_RELOCS 2546 && !info->shared 2547 && h != NULL 2548 && h->dynindx != -1 2549 && !h->non_got_ref 2550 && ((h->def_dynamic 2551 && !h->def_regular) 2552 || h->root.type == bfd_link_hash_undefweak 2553 || h->root.type == bfd_link_hash_undefined))) 2554 { 2555 Elf_Internal_Rela outrel; 2556 bfd_boolean skip, relocate; 2557 asection *sreloc; 2558 bfd_byte *loc; 2559 2560 /* When generating a shared object, these relocations 2561 are copied into the output file to be resolved at run 2562 time. */ 2563 skip = FALSE; 2564 relocate = FALSE; 2565 2566 outrel.r_offset = 2567 _bfd_elf_section_offset (output_bfd, info, input_section, 2568 rel->r_offset); 2569 if (outrel.r_offset == (bfd_vma) -1) 2570 skip = TRUE; 2571 else if (outrel.r_offset == (bfd_vma) -2) 2572 skip = TRUE, relocate = TRUE; 2573 2574 outrel.r_offset += (input_section->output_section->vma 2575 + input_section->output_offset); 2576 2577 if (skip) 2578 memset (&outrel, 0, sizeof outrel); 2579 else if (h != NULL 2580 && h->dynindx != -1 2581 && (r_type == R_390_PC16 2582 || r_type == R_390_PC16DBL 2583 || r_type == R_390_PC32 2584 || r_type == R_390_PC32DBL 2585 || r_type == R_390_PC64 2586 || !info->shared 2587 || !info->symbolic 2588 || !h->def_regular)) 2589 { 2590 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2591 outrel.r_addend = rel->r_addend; 2592 } 2593 else 2594 { 2595 /* This symbol is local, or marked to become local. */ 2596 outrel.r_addend = relocation + rel->r_addend; 2597 if (r_type == R_390_64) 2598 { 2599 relocate = TRUE; 2600 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2601 } 2602 else 2603 { 2604 long sindx; 2605 2606 if (bfd_is_abs_section (sec)) 2607 sindx = 0; 2608 else if (sec == NULL || sec->owner == NULL) 2609 { 2610 bfd_set_error(bfd_error_bad_value); 2611 return FALSE; 2612 } 2613 else 2614 { 2615 asection *osec; 2616 2617 osec = sec->output_section; 2618 sindx = elf_section_data (osec)->dynindx; 2619 2620 if (sindx == 0) 2621 { 2622 osec = htab->elf.text_index_section; 2623 sindx = elf_section_data (osec)->dynindx; 2624 } 2625 BFD_ASSERT (sindx != 0); 2626 2627 /* We are turning this relocation into one 2628 against a section symbol, so subtract out 2629 the output section's address but not the 2630 offset of the input section in the output 2631 section. */ 2632 outrel.r_addend -= osec->vma; 2633 } 2634 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2635 } 2636 } 2637 2638 sreloc = elf_section_data (input_section)->sreloc; 2639 if (sreloc == NULL) 2640 abort (); 2641 2642 loc = sreloc->contents; 2643 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2644 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2645 2646 /* If this reloc is against an external symbol, we do 2647 not want to fiddle with the addend. Otherwise, we 2648 need to include the symbol value so that it becomes 2649 an addend for the dynamic reloc. */ 2650 if (! relocate) 2651 continue; 2652 } 2653 2654 break; 2655 2656 /* Relocations for tls literal pool entries. */ 2657 case R_390_TLS_IE64: 2658 if (info->shared) 2659 { 2660 Elf_Internal_Rela outrel; 2661 asection *sreloc; 2662 bfd_byte *loc; 2663 2664 outrel.r_offset = rel->r_offset 2665 + input_section->output_section->vma 2666 + input_section->output_offset; 2667 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2668 sreloc = elf_section_data (input_section)->sreloc; 2669 if (sreloc == NULL) 2670 abort (); 2671 loc = sreloc->contents; 2672 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2673 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc); 2674 } 2675 /* Fall through. */ 2676 2677 case R_390_TLS_GD64: 2678 case R_390_TLS_GOTIE64: 2679 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2680 tls_type = GOT_UNKNOWN; 2681 if (h == NULL && local_got_offsets) 2682 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2683 else if (h != NULL) 2684 { 2685 tls_type = elf_s390_hash_entry(h)->tls_type; 2686 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2687 r_type = R_390_TLS_LE64; 2688 } 2689 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE) 2690 r_type = R_390_TLS_IE64; 2691 2692 if (r_type == R_390_TLS_LE64) 2693 { 2694 /* This relocation gets optimized away by the local exec 2695 access optimization. */ 2696 BFD_ASSERT (! unresolved_reloc); 2697 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2698 contents + rel->r_offset); 2699 continue; 2700 } 2701 2702 if (htab->sgot == NULL) 2703 abort (); 2704 2705 if (h != NULL) 2706 off = h->got.offset; 2707 else 2708 { 2709 if (local_got_offsets == NULL) 2710 abort (); 2711 2712 off = local_got_offsets[r_symndx]; 2713 } 2714 2715 emit_tls_relocs: 2716 2717 if ((off & 1) != 0) 2718 off &= ~1; 2719 else 2720 { 2721 Elf_Internal_Rela outrel; 2722 bfd_byte *loc; 2723 int dr_type, indx; 2724 2725 if (htab->srelgot == NULL) 2726 abort (); 2727 2728 outrel.r_offset = (htab->sgot->output_section->vma 2729 + htab->sgot->output_offset + off); 2730 2731 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2732 if (r_type == R_390_TLS_GD64) 2733 dr_type = R_390_TLS_DTPMOD; 2734 else 2735 dr_type = R_390_TLS_TPOFF; 2736 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2737 outrel.r_addend = relocation - dtpoff_base (info); 2738 else 2739 outrel.r_addend = 0; 2740 outrel.r_info = ELF64_R_INFO (indx, dr_type); 2741 loc = htab->srelgot->contents; 2742 loc += htab->srelgot->reloc_count++ 2743 * sizeof (Elf64_External_Rela); 2744 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2745 2746 if (r_type == R_390_TLS_GD64) 2747 { 2748 if (indx == 0) 2749 { 2750 BFD_ASSERT (! unresolved_reloc); 2751 bfd_put_64 (output_bfd, 2752 relocation - dtpoff_base (info), 2753 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2754 } 2755 else 2756 { 2757 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF); 2758 outrel.r_offset += GOT_ENTRY_SIZE; 2759 outrel.r_addend = 0; 2760 htab->srelgot->reloc_count++; 2761 loc += sizeof (Elf64_External_Rela); 2762 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2763 } 2764 } 2765 2766 if (h != NULL) 2767 h->got.offset |= 1; 2768 else 2769 local_got_offsets[r_symndx] |= 1; 2770 } 2771 2772 if (off >= (bfd_vma) -2) 2773 abort (); 2774 if (r_type == ELF64_R_TYPE (rel->r_info)) 2775 { 2776 relocation = htab->sgot->output_offset + off; 2777 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT) 2778 relocation += htab->sgot->output_section->vma; 2779 unresolved_reloc = FALSE; 2780 } 2781 else 2782 { 2783 bfd_put_64 (output_bfd, htab->sgot->output_offset + off, 2784 contents + rel->r_offset); 2785 continue; 2786 } 2787 break; 2788 2789 case R_390_TLS_GOTIE12: 2790 case R_390_TLS_GOTIE20: 2791 case R_390_TLS_IEENT: 2792 if (h == NULL) 2793 { 2794 if (local_got_offsets == NULL) 2795 abort(); 2796 off = local_got_offsets[r_symndx]; 2797 if (info->shared) 2798 goto emit_tls_relocs; 2799 } 2800 else 2801 { 2802 off = h->got.offset; 2803 tls_type = elf_s390_hash_entry(h)->tls_type; 2804 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 2805 goto emit_tls_relocs; 2806 } 2807 2808 if (htab->sgot == NULL) 2809 abort (); 2810 2811 BFD_ASSERT (! unresolved_reloc); 2812 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2813 htab->sgot->contents + off); 2814 relocation = htab->sgot->output_offset + off; 2815 if (r_type == R_390_TLS_IEENT) 2816 relocation += htab->sgot->output_section->vma; 2817 unresolved_reloc = FALSE; 2818 break; 2819 2820 case R_390_TLS_LDM64: 2821 if (! info->shared) 2822 /* The literal pool entry this relocation refers to gets ignored 2823 by the optimized code of the local exec model. Do nothing 2824 and the value will turn out zero. */ 2825 continue; 2826 2827 if (htab->sgot == NULL) 2828 abort (); 2829 2830 off = htab->tls_ldm_got.offset; 2831 if (off & 1) 2832 off &= ~1; 2833 else 2834 { 2835 Elf_Internal_Rela outrel; 2836 bfd_byte *loc; 2837 2838 if (htab->srelgot == NULL) 2839 abort (); 2840 2841 outrel.r_offset = (htab->sgot->output_section->vma 2842 + htab->sgot->output_offset + off); 2843 2844 bfd_put_64 (output_bfd, 0, 2845 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2846 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD); 2847 outrel.r_addend = 0; 2848 loc = htab->srelgot->contents; 2849 loc += htab->srelgot->reloc_count++ 2850 * sizeof (Elf64_External_Rela); 2851 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2852 htab->tls_ldm_got.offset |= 1; 2853 } 2854 relocation = htab->sgot->output_offset + off; 2855 unresolved_reloc = FALSE; 2856 break; 2857 2858 case R_390_TLS_LE64: 2859 if (info->shared) 2860 { 2861 /* Linking a shared library with non-fpic code requires 2862 a R_390_TLS_TPOFF relocation. */ 2863 Elf_Internal_Rela outrel; 2864 asection *sreloc; 2865 bfd_byte *loc; 2866 int indx; 2867 2868 outrel.r_offset = rel->r_offset 2869 + input_section->output_section->vma 2870 + input_section->output_offset; 2871 if (h != NULL && h->dynindx != -1) 2872 indx = h->dynindx; 2873 else 2874 indx = 0; 2875 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF); 2876 if (indx == 0) 2877 outrel.r_addend = relocation - dtpoff_base (info); 2878 else 2879 outrel.r_addend = 0; 2880 sreloc = elf_section_data (input_section)->sreloc; 2881 if (sreloc == NULL) 2882 abort (); 2883 loc = sreloc->contents; 2884 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2885 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2886 } 2887 else 2888 { 2889 BFD_ASSERT (! unresolved_reloc); 2890 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2891 contents + rel->r_offset); 2892 } 2893 continue; 2894 2895 case R_390_TLS_LDO64: 2896 if (info->shared) 2897 relocation -= dtpoff_base (info); 2898 else 2899 /* When converting LDO to LE, we must negate. */ 2900 relocation = -tpoff (info, relocation); 2901 break; 2902 2903 /* Relocations for tls instructions. */ 2904 case R_390_TLS_LOAD: 2905 case R_390_TLS_GDCALL: 2906 case R_390_TLS_LDCALL: 2907 tls_type = GOT_UNKNOWN; 2908 if (h == NULL && local_got_offsets) 2909 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2910 else if (h != NULL) 2911 tls_type = elf_s390_hash_entry(h)->tls_type; 2912 2913 if (tls_type == GOT_TLS_GD) 2914 continue; 2915 2916 if (r_type == R_390_TLS_LOAD) 2917 { 2918 if (!info->shared && (h == NULL || h->dynindx == -1)) 2919 { 2920 /* IE->LE transition. Four valid cases: 2921 lg %rx,(0,%ry) -> sllg %rx,%ry,0 2922 lg %rx,(%ry,0) -> sllg %rx,%ry,0 2923 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 2924 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */ 2925 unsigned int insn0, insn1, ry; 2926 2927 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2928 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2929 if (insn1 != 0x0004) 2930 invalid_tls_insn (input_bfd, input_section, rel); 2931 ry = 0; 2932 if ((insn0 & 0xff00f000) == 0xe3000000) 2933 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */ 2934 ry = (insn0 & 0x000f0000); 2935 else if ((insn0 & 0xff0f0000) == 0xe3000000) 2936 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */ 2937 ry = (insn0 & 0x0000f000) << 4; 2938 else if ((insn0 & 0xff00f000) == 0xe300c000) 2939 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */ 2940 ry = (insn0 & 0x000f0000); 2941 else if ((insn0 & 0xff0f0000) == 0xe30c0000) 2942 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */ 2943 ry = (insn0 & 0x0000f000) << 4; 2944 else 2945 invalid_tls_insn (input_bfd, input_section, rel); 2946 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry; 2947 insn1 = 0x000d; 2948 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2949 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2950 } 2951 } 2952 else if (r_type == R_390_TLS_GDCALL) 2953 { 2954 unsigned int insn0, insn1; 2955 2956 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2957 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2958 if ((insn0 & 0xffff0000) != 0xc0e50000) 2959 invalid_tls_insn (input_bfd, input_section, rel); 2960 if (!info->shared && (h == NULL || h->dynindx == -1)) 2961 { 2962 /* GD->LE transition. 2963 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2964 insn0 = 0xc0040000; 2965 insn1 = 0x0000; 2966 } 2967 else 2968 { 2969 /* GD->IE transition. 2970 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */ 2971 insn0 = 0xe322c000; 2972 insn1 = 0x0004; 2973 } 2974 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2975 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2976 } 2977 else if (r_type == R_390_TLS_LDCALL) 2978 { 2979 if (!info->shared) 2980 { 2981 unsigned int insn0, insn1; 2982 2983 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2984 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2985 if ((insn0 & 0xffff0000) != 0xc0e50000) 2986 invalid_tls_insn (input_bfd, input_section, rel); 2987 /* LD->LE transition. 2988 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2989 insn0 = 0xc0040000; 2990 insn1 = 0x0000; 2991 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2992 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2993 } 2994 } 2995 continue; 2996 2997 default: 2998 break; 2999 } 3000 3001 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3002 because such sections are not SEC_ALLOC and thus ld.so will 3003 not process them. */ 3004 if (unresolved_reloc 3005 && !((input_section->flags & SEC_DEBUGGING) != 0 3006 && h->def_dynamic)) 3007 (*_bfd_error_handler) 3008 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3009 input_bfd, 3010 input_section, 3011 (long) rel->r_offset, 3012 howto->name, 3013 h->root.root.string); 3014 3015 if (r_type == R_390_20 3016 || r_type == R_390_GOT20 3017 || r_type == R_390_GOTPLT20 3018 || r_type == R_390_TLS_GOTIE20) 3019 { 3020 relocation += rel->r_addend; 3021 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3022 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3023 contents, rel->r_offset, 3024 relocation, 0); 3025 } 3026 else 3027 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3028 contents, rel->r_offset, 3029 relocation, rel->r_addend); 3030 3031 if (r != bfd_reloc_ok) 3032 { 3033 const char *name; 3034 3035 if (h != NULL) 3036 name = h->root.root.string; 3037 else 3038 { 3039 name = bfd_elf_string_from_elf_section (input_bfd, 3040 symtab_hdr->sh_link, 3041 sym->st_name); 3042 if (name == NULL) 3043 return FALSE; 3044 if (*name == '\0') 3045 name = bfd_section_name (input_bfd, sec); 3046 } 3047 3048 if (r == bfd_reloc_overflow) 3049 { 3050 3051 if (! ((*info->callbacks->reloc_overflow) 3052 (info, (h ? &h->root : NULL), name, howto->name, 3053 (bfd_vma) 0, input_bfd, input_section, 3054 rel->r_offset))) 3055 return FALSE; 3056 } 3057 else 3058 { 3059 (*_bfd_error_handler) 3060 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3061 input_bfd, input_section, 3062 (long) rel->r_offset, name, (int) r); 3063 return FALSE; 3064 } 3065 } 3066 } 3067 3068 return TRUE; 3069} 3070 3071/* Finish up dynamic symbol handling. We set the contents of various 3072 dynamic sections here. */ 3073 3074static bfd_boolean 3075elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) 3076 bfd *output_bfd; 3077 struct bfd_link_info *info; 3078 struct elf_link_hash_entry *h; 3079 Elf_Internal_Sym *sym; 3080{ 3081 struct elf_s390_link_hash_table *htab; 3082 3083 htab = elf_s390_hash_table (info); 3084 3085 if (h->plt.offset != (bfd_vma) -1) 3086 { 3087 bfd_vma plt_index; 3088 bfd_vma got_offset; 3089 Elf_Internal_Rela rela; 3090 bfd_byte *loc; 3091 3092 /* This symbol has an entry in the procedure linkage table. Set 3093 it up. */ 3094 3095 if (h->dynindx == -1 3096 || htab->splt == NULL 3097 || htab->sgotplt == NULL 3098 || htab->srelplt == NULL) 3099 abort (); 3100 3101 /* Calc. index no. 3102 Current offset - size first entry / entry size. */ 3103 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3104 3105 /* Offset in GOT is PLT index plus GOT headers(3) times 8, 3106 addr & GOT addr. */ 3107 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3108 3109 /* Fill in the blueprint of a PLT. */ 3110 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0, 3111 htab->splt->contents + h->plt.offset); 3112 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, 3113 htab->splt->contents + h->plt.offset + 4); 3114 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, 3115 htab->splt->contents + h->plt.offset + 8); 3116 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, 3117 htab->splt->contents + h->plt.offset + 12); 3118 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, 3119 htab->splt->contents + h->plt.offset + 16); 3120 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5, 3121 htab->splt->contents + h->plt.offset + 20); 3122 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6, 3123 htab->splt->contents + h->plt.offset + 24); 3124 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7, 3125 htab->splt->contents + h->plt.offset + 28); 3126 /* Fixup the relative address to the GOT entry */ 3127 bfd_put_32 (output_bfd, 3128 (htab->sgotplt->output_section->vma + 3129 htab->sgotplt->output_offset + got_offset 3130 - (htab->splt->output_section->vma + h->plt.offset))/2, 3131 htab->splt->contents + h->plt.offset + 2); 3132 /* Fixup the relative branch to PLT 0 */ 3133 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + 3134 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3135 htab->splt->contents + h->plt.offset + 24); 3136 /* Fixup offset into symbol table */ 3137 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), 3138 htab->splt->contents + h->plt.offset + 28); 3139 3140 /* Fill in the entry in the global offset table. 3141 Points to instruction after GOT offset. */ 3142 bfd_put_64 (output_bfd, 3143 (htab->splt->output_section->vma 3144 + htab->splt->output_offset 3145 + h->plt.offset 3146 + 14), 3147 htab->sgotplt->contents + got_offset); 3148 3149 /* Fill in the entry in the .rela.plt section. */ 3150 rela.r_offset = (htab->sgotplt->output_section->vma 3151 + htab->sgotplt->output_offset 3152 + got_offset); 3153 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3154 rela.r_addend = 0; 3155 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); 3156 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3157 3158 if (!h->def_regular) 3159 { 3160 /* Mark the symbol as undefined, rather than as defined in 3161 the .plt section. Leave the value alone. This is a clue 3162 for the dynamic linker, to make function pointer 3163 comparisons work between an application and shared 3164 library. */ 3165 sym->st_shndx = SHN_UNDEF; 3166 } 3167 } 3168 3169 if (h->got.offset != (bfd_vma) -1 3170 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3171 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3172 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3173 { 3174 Elf_Internal_Rela rela; 3175 bfd_byte *loc; 3176 3177 /* This symbol has an entry in the global offset table. Set it 3178 up. */ 3179 if (htab->sgot == NULL || htab->srelgot == NULL) 3180 abort (); 3181 3182 rela.r_offset = (htab->sgot->output_section->vma 3183 + htab->sgot->output_offset 3184 + (h->got.offset &~ (bfd_vma) 1)); 3185 3186 /* If this is a static link, or it is a -Bsymbolic link and the 3187 symbol is defined locally or was forced to be local because 3188 of a version file, we just want to emit a RELATIVE reloc. 3189 The entry in the global offset table will already have been 3190 initialized in the relocate_section function. */ 3191 if (info->shared 3192 && (info->symbolic 3193 || h->dynindx == -1 3194 || h->forced_local) 3195 && h->def_regular) 3196 { 3197 BFD_ASSERT((h->got.offset & 1) != 0); 3198 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 3199 rela.r_addend = (h->root.u.def.value 3200 + h->root.u.def.section->output_section->vma 3201 + h->root.u.def.section->output_offset); 3202 } 3203 else 3204 { 3205 BFD_ASSERT((h->got.offset & 1) == 0); 3206 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset); 3207 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); 3208 rela.r_addend = 0; 3209 } 3210 3211 loc = htab->srelgot->contents; 3212 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3213 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3214 } 3215 3216 if (h->needs_copy) 3217 { 3218 Elf_Internal_Rela rela; 3219 bfd_byte *loc; 3220 3221 /* This symbols needs a copy reloc. Set it up. */ 3222 3223 if (h->dynindx == -1 3224 || (h->root.type != bfd_link_hash_defined 3225 && h->root.type != bfd_link_hash_defweak) 3226 || htab->srelbss == NULL) 3227 abort (); 3228 3229 rela.r_offset = (h->root.u.def.value 3230 + h->root.u.def.section->output_section->vma 3231 + h->root.u.def.section->output_offset); 3232 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); 3233 rela.r_addend = 0; 3234 loc = htab->srelbss->contents; 3235 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); 3236 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3237 } 3238 3239 /* Mark some specially defined symbols as absolute. */ 3240 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3241 || h == htab->elf.hgot 3242 || h == htab->elf.hplt) 3243 sym->st_shndx = SHN_ABS; 3244 3245 return TRUE; 3246} 3247 3248/* Used to decide how to sort relocs in an optimal manner for the 3249 dynamic linker, before writing them out. */ 3250 3251static enum elf_reloc_type_class 3252elf_s390_reloc_type_class (rela) 3253 const Elf_Internal_Rela *rela; 3254{ 3255 switch ((int) ELF64_R_TYPE (rela->r_info)) 3256 { 3257 case R_390_RELATIVE: 3258 return reloc_class_relative; 3259 case R_390_JMP_SLOT: 3260 return reloc_class_plt; 3261 case R_390_COPY: 3262 return reloc_class_copy; 3263 default: 3264 return reloc_class_normal; 3265 } 3266} 3267 3268/* Finish up the dynamic sections. */ 3269 3270static bfd_boolean 3271elf_s390_finish_dynamic_sections (output_bfd, info) 3272 bfd *output_bfd; 3273 struct bfd_link_info *info; 3274{ 3275 struct elf_s390_link_hash_table *htab; 3276 bfd *dynobj; 3277 asection *sdyn; 3278 3279 htab = elf_s390_hash_table (info); 3280 dynobj = htab->elf.dynobj; 3281 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3282 3283 if (htab->elf.dynamic_sections_created) 3284 { 3285 Elf64_External_Dyn *dyncon, *dynconend; 3286 3287 if (sdyn == NULL || htab->sgot == NULL) 3288 abort (); 3289 3290 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3291 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 3292 for (; dyncon < dynconend; dyncon++) 3293 { 3294 Elf_Internal_Dyn dyn; 3295 asection *s; 3296 3297 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3298 3299 switch (dyn.d_tag) 3300 { 3301 default: 3302 continue; 3303 3304 case DT_PLTGOT: 3305 dyn.d_un.d_ptr = htab->sgot->output_section->vma; 3306 break; 3307 3308 case DT_JMPREL: 3309 dyn.d_un.d_ptr = htab->srelplt->output_section->vma; 3310 break; 3311 3312 case DT_PLTRELSZ: 3313 s = htab->srelplt->output_section; 3314 dyn.d_un.d_val = s->size; 3315 break; 3316 3317 case DT_RELASZ: 3318 /* The procedure linkage table relocs (DT_JMPREL) should 3319 not be included in the overall relocs (DT_RELA). 3320 Therefore, we override the DT_RELASZ entry here to 3321 make it not include the JMPREL relocs. Since the 3322 linker script arranges for .rela.plt to follow all 3323 other relocation sections, we don't have to worry 3324 about changing the DT_RELA entry. */ 3325 s = htab->srelplt->output_section; 3326 dyn.d_un.d_val -= s->size; 3327 break; 3328 } 3329 3330 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3331 } 3332 3333 /* Fill in the special first entry in the procedure linkage table. */ 3334 if (htab->splt && htab->splt->size > 0) 3335 { 3336 /* fill in blueprint for plt 0 entry */ 3337 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0, 3338 htab->splt->contents ); 3339 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, 3340 htab->splt->contents +4 ); 3341 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, 3342 htab->splt->contents +12 ); 3343 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, 3344 htab->splt->contents +16 ); 3345 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, 3346 htab->splt->contents +20 ); 3347 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6, 3348 htab->splt->contents + 24); 3349 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7, 3350 htab->splt->contents + 28 ); 3351 /* Fixup relative address to start of GOT */ 3352 bfd_put_32 (output_bfd, 3353 (htab->sgotplt->output_section->vma + 3354 htab->sgotplt->output_offset 3355 - htab->splt->output_section->vma - 6)/2, 3356 htab->splt->contents + 8); 3357 } 3358 elf_section_data (htab->splt->output_section) 3359 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; 3360 } 3361 3362 if (htab->sgotplt) 3363 { 3364 /* Fill in the first three entries in the global offset table. */ 3365 if (htab->sgotplt->size > 0) 3366 { 3367 bfd_put_64 (output_bfd, 3368 (sdyn == NULL ? (bfd_vma) 0 3369 : sdyn->output_section->vma + sdyn->output_offset), 3370 htab->sgotplt->contents); 3371 /* One entry for shared object struct ptr. */ 3372 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); 3373 /* One entry for _dl_runtime_resolve. */ 3374 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12); 3375 } 3376 3377 elf_section_data (htab->sgot->output_section) 3378 ->this_hdr.sh_entsize = 8; 3379 } 3380 return TRUE; 3381} 3382 3383/* Return address for Ith PLT stub in section PLT, for relocation REL 3384 or (bfd_vma) -1 if it should not be included. */ 3385 3386static bfd_vma 3387elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3388 const arelent *rel ATTRIBUTE_UNUSED) 3389{ 3390 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3391} 3392 3393 3394/* Why was the hash table entry size definition changed from 3395 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and 3396 this is the only reason for the s390_elf64_size_info structure. */ 3397 3398const struct elf_size_info s390_elf64_size_info = 3399{ 3400 sizeof (Elf64_External_Ehdr), 3401 sizeof (Elf64_External_Phdr), 3402 sizeof (Elf64_External_Shdr), 3403 sizeof (Elf64_External_Rel), 3404 sizeof (Elf64_External_Rela), 3405 sizeof (Elf64_External_Sym), 3406 sizeof (Elf64_External_Dyn), 3407 sizeof (Elf_External_Note), 3408 8, /* hash-table entry size. */ 3409 1, /* internal relocations per external relocations. */ 3410 64, /* arch_size. */ 3411 3, /* log_file_align. */ 3412 ELFCLASS64, EV_CURRENT, 3413 bfd_elf64_write_out_phdrs, 3414 bfd_elf64_write_shdrs_and_ehdr, 3415 bfd_elf64_write_relocs, 3416 bfd_elf64_swap_symbol_in, 3417 bfd_elf64_swap_symbol_out, 3418 bfd_elf64_slurp_reloc_table, 3419 bfd_elf64_slurp_symbol_table, 3420 bfd_elf64_swap_dyn_in, 3421 bfd_elf64_swap_dyn_out, 3422 bfd_elf64_swap_reloc_in, 3423 bfd_elf64_swap_reloc_out, 3424 bfd_elf64_swap_reloca_in, 3425 bfd_elf64_swap_reloca_out 3426}; 3427 3428#define TARGET_BIG_SYM bfd_elf64_s390_vec 3429#define TARGET_BIG_NAME "elf64-s390" 3430#define ELF_ARCH bfd_arch_s390 3431#define ELF_MACHINE_CODE EM_S390 3432#define ELF_MACHINE_ALT1 EM_S390_OLD 3433#define ELF_MAXPAGESIZE 0x1000 3434 3435#define elf_backend_size_info s390_elf64_size_info 3436 3437#define elf_backend_can_gc_sections 1 3438#define elf_backend_can_refcount 1 3439#define elf_backend_want_got_plt 1 3440#define elf_backend_plt_readonly 1 3441#define elf_backend_want_plt_sym 0 3442#define elf_backend_got_header_size 24 3443#define elf_backend_rela_normal 1 3444 3445#define elf_info_to_howto elf_s390_info_to_howto 3446 3447#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name 3448#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create 3449#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3450 3451#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3452#define elf_backend_check_relocs elf_s390_check_relocs 3453#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3454#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 3455#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3456#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3457#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3458#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 3459#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3460#define elf_backend_relocate_section elf_s390_relocate_section 3461#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 3462#define elf_backend_init_index_section _bfd_elf_init_1_index_section 3463#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3464#define elf_backend_plt_sym_val elf_s390_plt_sym_val 3465 3466#define bfd_elf64_mkobject elf_s390_mkobject 3467#define elf_backend_object_p elf_s390_object_p 3468 3469#include "elf64-target.h" 3470