elf64-s390.c revision 218822
1/* IBM S/390-specific support for 64-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 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 "sysdep.h" 24#include "bfd.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 359static reloc_howto_type * 360elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 361 const char *r_name) 362{ 363 unsigned int i; 364 365 for (i = 0; 366 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); 367 i++) 368 if (elf_howto_table[i].name != NULL 369 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 370 return &elf_howto_table[i]; 371 372 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0) 373 return &elf64_s390_vtinherit_howto; 374 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0) 375 return &elf64_s390_vtentry_howto; 376 377 return NULL; 378} 379 380/* We need to use ELF64_R_TYPE so we have our own copy of this function, 381 and elf64-s390.c has its own copy. */ 382 383static void 384elf_s390_info_to_howto (abfd, cache_ptr, dst) 385 bfd *abfd ATTRIBUTE_UNUSED; 386 arelent *cache_ptr; 387 Elf_Internal_Rela *dst; 388{ 389 unsigned int r_type = ELF64_R_TYPE(dst->r_info); 390 switch (r_type) 391 { 392 case R_390_GNU_VTINHERIT: 393 cache_ptr->howto = &elf64_s390_vtinherit_howto; 394 break; 395 396 case R_390_GNU_VTENTRY: 397 cache_ptr->howto = &elf64_s390_vtentry_howto; 398 break; 399 400 default: 401 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 402 { 403 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 404 abfd, (int) r_type); 405 r_type = R_390_NONE; 406 } 407 cache_ptr->howto = &elf_howto_table[r_type]; 408 } 409} 410 411/* A relocation function which doesn't do anything. */ 412static bfd_reloc_status_type 413s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section, 414 output_bfd, error_message) 415 bfd *abfd ATTRIBUTE_UNUSED; 416 arelent *reloc_entry; 417 asymbol *symbol ATTRIBUTE_UNUSED; 418 PTR data ATTRIBUTE_UNUSED; 419 asection *input_section; 420 bfd *output_bfd; 421 char **error_message ATTRIBUTE_UNUSED; 422{ 423 if (output_bfd) 424 reloc_entry->address += input_section->output_offset; 425 return bfd_reloc_ok; 426} 427 428/* Handle the large displacement relocs. */ 429static bfd_reloc_status_type 430s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section, 431 output_bfd, error_message) 432 bfd *abfd; 433 arelent *reloc_entry; 434 asymbol *symbol; 435 PTR data; 436 asection *input_section; 437 bfd *output_bfd; 438 char **error_message ATTRIBUTE_UNUSED; 439{ 440 reloc_howto_type *howto = reloc_entry->howto; 441 bfd_vma relocation; 442 bfd_vma insn; 443 444 if (output_bfd != (bfd *) NULL 445 && (symbol->flags & BSF_SECTION_SYM) == 0 446 && (! howto->partial_inplace 447 || reloc_entry->addend == 0)) 448 { 449 reloc_entry->address += input_section->output_offset; 450 return bfd_reloc_ok; 451 } 452 if (output_bfd != NULL) 453 return bfd_reloc_continue; 454 455 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 456 return bfd_reloc_outofrange; 457 458 relocation = (symbol->value 459 + symbol->section->output_section->vma 460 + symbol->section->output_offset); 461 relocation += reloc_entry->addend; 462 if (howto->pc_relative) 463 { 464 relocation -= (input_section->output_section->vma 465 + input_section->output_offset); 466 relocation -= reloc_entry->address; 467 } 468 469 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 470 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 471 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 472 473 if ((bfd_signed_vma) relocation < - 0x80000 474 || (bfd_signed_vma) relocation > 0x7ffff) 475 return bfd_reloc_overflow; 476 else 477 return bfd_reloc_ok; 478} 479 480static bfd_boolean 481elf_s390_is_local_label_name (abfd, name) 482 bfd *abfd; 483 const char *name; 484{ 485 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 486 return TRUE; 487 488 return _bfd_elf_is_local_label_name (abfd, name); 489} 490 491/* Functions for the 390 ELF linker. */ 492 493/* The name of the dynamic interpreter. This is put in the .interp 494 section. */ 495 496#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 497 498/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 499 copying dynamic variables from a shared lib into an app's dynbss 500 section, and instead use a dynamic relocation to point into the 501 shared lib. */ 502#define ELIMINATE_COPY_RELOCS 1 503 504/* The size in bytes of the first entry in the procedure linkage table. */ 505#define PLT_FIRST_ENTRY_SIZE 32 506/* The size in bytes of an entry in the procedure linkage table. */ 507#define PLT_ENTRY_SIZE 32 508 509#define GOT_ENTRY_SIZE 8 510 511/* The first three entries in a procedure linkage table are reserved, 512 and the initial contents are unimportant (we zero them out). 513 Subsequent entries look like this. See the SVR4 ABI 386 514 supplement to see how this works. */ 515 516/* For the s390, simple addr offset can only be 0 - 4096. 517 To use the full 16777216 TB address space, several instructions 518 are needed to load an address in a register and execute 519 a branch( or just saving the address) 520 521 Furthermore, only r 0 and 1 are free to use!!! */ 522 523/* The first 3 words in the GOT are then reserved. 524 Word 0 is the address of the dynamic table. 525 Word 1 is a pointer to a structure describing the object 526 Word 2 is used to point to the loader entry address. 527 528 The code for PLT entries looks like this: 529 530 The GOT holds the address in the PLT to be executed. 531 The loader then gets: 532 24(15) = Pointer to the structure describing the object. 533 28(15) = Offset in symbol table 534 The loader must then find the module where the function is 535 and insert the address in the GOT. 536 537 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 538 LG 1,0(1) # 6 bytes Load address from GOT in r1 539 BCR 15,1 # 2 bytes Jump to address 540 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 541 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 542 BRCL 15,-x # 6 bytes Jump to start of PLT 543 .long ? # 4 bytes offset into symbol table 544 545 Total = 32 bytes per PLT entry 546 Fixup at offset 2: relative address to GOT entry 547 Fixup at offset 22: relative branch to PLT0 548 Fixup at offset 28: 32 bit offset into symbol table 549 550 A 32 bit offset into the symbol table is enough. It allows for symbol 551 tables up to a size of 2 gigabyte. A single dynamic object (the main 552 program, any shared library) is limited to 4GB in size and I want to see 553 the program that manages to have a symbol table of more than 2 GB with a 554 total size of at max 4 GB. */ 555 556#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000 557#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310 558#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004 559#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10 560#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c 561#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4 562#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000 563#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000 564 565/* The first PLT entry pushes the offset into the symbol table 566 from R1 onto the stack at 8(15) and the loader object info 567 at 12(15), loads the loader address in R1 and jumps to it. */ 568 569/* The first entry in the PLT: 570 571 PLT0: 572 STG 1,56(15) # r1 contains the offset into the symbol table 573 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table 574 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack 575 LG 1,16(1) # get entry address of loader 576 BCR 15,1 # jump to loader 577 578 Fixup at offset 8: relative address to start of GOT. */ 579 580#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038 581#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010 582#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000 583#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030 584#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310 585#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004 586#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700 587#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700 588 589/* The s390 linker needs to keep track of the number of relocs that it 590 decides to copy as dynamic relocs in check_relocs for each symbol. 591 This is so that it can later discard them if they are found to be 592 unnecessary. We store the information in a field extending the 593 regular ELF linker hash table. */ 594 595struct elf_s390_dyn_relocs 596{ 597 struct elf_s390_dyn_relocs *next; 598 599 /* The input section of the reloc. */ 600 asection *sec; 601 602 /* Total number of relocs copied for the input section. */ 603 bfd_size_type count; 604 605 /* Number of pc-relative relocs copied for the input section. */ 606 bfd_size_type pc_count; 607}; 608 609/* s390 ELF linker hash entry. */ 610 611struct elf_s390_link_hash_entry 612{ 613 struct elf_link_hash_entry elf; 614 615 /* Track dynamic relocs copied for this symbol. */ 616 struct elf_s390_dyn_relocs *dyn_relocs; 617 618 /* Number of GOTPLT references for a function. */ 619 bfd_signed_vma gotplt_refcount; 620 621#define GOT_UNKNOWN 0 622#define GOT_NORMAL 1 623#define GOT_TLS_GD 2 624#define GOT_TLS_IE 3 625#define GOT_TLS_IE_NLT 3 626 unsigned char tls_type; 627}; 628 629#define elf_s390_hash_entry(ent) \ 630 ((struct elf_s390_link_hash_entry *)(ent)) 631 632struct elf_s390_obj_tdata 633{ 634 struct elf_obj_tdata root; 635 636 /* tls_type for each local got entry. */ 637 char *local_got_tls_type; 638}; 639 640#define elf_s390_tdata(abfd) \ 641 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 642 643#define elf_s390_local_got_tls_type(abfd) \ 644 (elf_s390_tdata (abfd)->local_got_tls_type) 645 646static bfd_boolean 647elf_s390_mkobject (bfd *abfd) 648{ 649 if (abfd->tdata.any == NULL) 650 { 651 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata); 652 abfd->tdata.any = bfd_zalloc (abfd, amt); 653 if (abfd->tdata.any == NULL) 654 return FALSE; 655 } 656 return bfd_elf_mkobject (abfd); 657} 658 659static bfd_boolean 660elf_s390_object_p (abfd) 661 bfd *abfd; 662{ 663 /* Set the right machine number for an s390 elf32 file. */ 664 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); 665} 666 667/* s390 ELF linker hash table. */ 668 669struct elf_s390_link_hash_table 670{ 671 struct elf_link_hash_table elf; 672 673 /* Short-cuts to get to dynamic linker sections. */ 674 asection *sgot; 675 asection *sgotplt; 676 asection *srelgot; 677 asection *splt; 678 asection *srelplt; 679 asection *sdynbss; 680 asection *srelbss; 681 682 union { 683 bfd_signed_vma refcount; 684 bfd_vma offset; 685 } tls_ldm_got; 686 687 /* Small local sym to section mapping cache. */ 688 struct sym_sec_cache sym_sec; 689}; 690 691/* Get the s390 ELF linker hash table from a link_info structure. */ 692 693#define elf_s390_hash_table(p) \ 694 ((struct elf_s390_link_hash_table *) ((p)->hash)) 695 696/* Create an entry in an s390 ELF linker hash table. */ 697 698static struct bfd_hash_entry * 699link_hash_newfunc (entry, table, string) 700 struct bfd_hash_entry *entry; 701 struct bfd_hash_table *table; 702 const char *string; 703{ 704 /* Allocate the structure if it has not already been allocated by a 705 subclass. */ 706 if (entry == NULL) 707 { 708 entry = bfd_hash_allocate (table, 709 sizeof (struct elf_s390_link_hash_entry)); 710 if (entry == NULL) 711 return entry; 712 } 713 714 /* Call the allocation method of the superclass. */ 715 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 716 if (entry != NULL) 717 { 718 struct elf_s390_link_hash_entry *eh; 719 720 eh = (struct elf_s390_link_hash_entry *) entry; 721 eh->dyn_relocs = NULL; 722 eh->gotplt_refcount = 0; 723 eh->tls_type = GOT_UNKNOWN; 724 } 725 726 return entry; 727} 728 729/* Create an s390 ELF linker hash table. */ 730 731static struct bfd_link_hash_table * 732elf_s390_link_hash_table_create (abfd) 733 bfd *abfd; 734{ 735 struct elf_s390_link_hash_table *ret; 736 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 737 738 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt); 739 if (ret == NULL) 740 return NULL; 741 742 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 743 sizeof (struct elf_s390_link_hash_entry))) 744 { 745 free (ret); 746 return NULL; 747 } 748 749 ret->sgot = NULL; 750 ret->sgotplt = NULL; 751 ret->srelgot = NULL; 752 ret->splt = NULL; 753 ret->srelplt = NULL; 754 ret->sdynbss = NULL; 755 ret->srelbss = NULL; 756 ret->tls_ldm_got.refcount = 0; 757 ret->sym_sec.abfd = NULL; 758 759 return &ret->elf.root; 760} 761 762/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 763 shortcuts to them in our hash table. */ 764 765static bfd_boolean 766create_got_section (dynobj, info) 767 bfd *dynobj; 768 struct bfd_link_info *info; 769{ 770 struct elf_s390_link_hash_table *htab; 771 772 if (! _bfd_elf_create_got_section (dynobj, info)) 773 return FALSE; 774 775 htab = elf_s390_hash_table (info); 776 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 777 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 778 if (!htab->sgot || !htab->sgotplt) 779 abort (); 780 781 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", 782 (SEC_ALLOC | SEC_LOAD 783 | SEC_HAS_CONTENTS 784 | SEC_IN_MEMORY 785 | SEC_LINKER_CREATED 786 | SEC_READONLY)); 787 if (htab->srelgot == NULL 788 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) 789 return FALSE; 790 return TRUE; 791} 792 793/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 794 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 795 hash table. */ 796 797static bfd_boolean 798elf_s390_create_dynamic_sections (dynobj, info) 799 bfd *dynobj; 800 struct bfd_link_info *info; 801{ 802 struct elf_s390_link_hash_table *htab; 803 804 htab = elf_s390_hash_table (info); 805 if (!htab->sgot && !create_got_section (dynobj, info)) 806 return FALSE; 807 808 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 809 return FALSE; 810 811 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 812 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 813 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 814 if (!info->shared) 815 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 816 817 if (!htab->splt || !htab->srelplt || !htab->sdynbss 818 || (!info->shared && !htab->srelbss)) 819 abort (); 820 821 return TRUE; 822} 823 824/* Copy the extra info we tack onto an elf_link_hash_entry. */ 825 826static void 827elf_s390_copy_indirect_symbol (info, dir, ind) 828 struct bfd_link_info *info; 829 struct elf_link_hash_entry *dir, *ind; 830{ 831 struct elf_s390_link_hash_entry *edir, *eind; 832 833 edir = (struct elf_s390_link_hash_entry *) dir; 834 eind = (struct elf_s390_link_hash_entry *) ind; 835 836 if (eind->dyn_relocs != NULL) 837 { 838 if (edir->dyn_relocs != NULL) 839 { 840 struct elf_s390_dyn_relocs **pp; 841 struct elf_s390_dyn_relocs *p; 842 843 /* Add reloc counts against the indirect sym to the direct sym 844 list. Merge any entries against the same section. */ 845 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 846 { 847 struct elf_s390_dyn_relocs *q; 848 849 for (q = edir->dyn_relocs; q != NULL; q = q->next) 850 if (q->sec == p->sec) 851 { 852 q->pc_count += p->pc_count; 853 q->count += p->count; 854 *pp = p->next; 855 break; 856 } 857 if (q == NULL) 858 pp = &p->next; 859 } 860 *pp = edir->dyn_relocs; 861 } 862 863 edir->dyn_relocs = eind->dyn_relocs; 864 eind->dyn_relocs = NULL; 865 } 866 867 if (ind->root.type == bfd_link_hash_indirect 868 && dir->got.refcount <= 0) 869 { 870 edir->tls_type = eind->tls_type; 871 eind->tls_type = GOT_UNKNOWN; 872 } 873 874 if (ELIMINATE_COPY_RELOCS 875 && ind->root.type != bfd_link_hash_indirect 876 && dir->dynamic_adjusted) 877 { 878 /* If called to transfer flags for a weakdef during processing 879 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 880 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 881 dir->ref_dynamic |= ind->ref_dynamic; 882 dir->ref_regular |= ind->ref_regular; 883 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 884 dir->needs_plt |= ind->needs_plt; 885 } 886 else 887 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 888} 889 890static int 891elf_s390_tls_transition (info, r_type, is_local) 892 struct bfd_link_info *info; 893 int r_type; 894 int is_local; 895{ 896 if (info->shared) 897 return r_type; 898 899 switch (r_type) 900 { 901 case R_390_TLS_GD64: 902 case R_390_TLS_IE64: 903 if (is_local) 904 return R_390_TLS_LE64; 905 return R_390_TLS_IE64; 906 case R_390_TLS_GOTIE64: 907 if (is_local) 908 return R_390_TLS_LE64; 909 return R_390_TLS_GOTIE64; 910 case R_390_TLS_LDM64: 911 return R_390_TLS_LE64; 912 } 913 914 return r_type; 915} 916 917/* Look through the relocs for a section during the first phase, and 918 allocate space in the global offset table or procedure linkage 919 table. */ 920 921static bfd_boolean 922elf_s390_check_relocs (abfd, info, sec, relocs) 923 bfd *abfd; 924 struct bfd_link_info *info; 925 asection *sec; 926 const Elf_Internal_Rela *relocs; 927{ 928 struct elf_s390_link_hash_table *htab; 929 Elf_Internal_Shdr *symtab_hdr; 930 struct elf_link_hash_entry **sym_hashes; 931 const Elf_Internal_Rela *rel; 932 const Elf_Internal_Rela *rel_end; 933 asection *sreloc; 934 bfd_signed_vma *local_got_refcounts; 935 int tls_type, old_tls_type; 936 937 if (info->relocatable) 938 return TRUE; 939 940 htab = elf_s390_hash_table (info); 941 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 942 sym_hashes = elf_sym_hashes (abfd); 943 local_got_refcounts = elf_local_got_refcounts (abfd); 944 945 sreloc = NULL; 946 947 rel_end = relocs + sec->reloc_count; 948 for (rel = relocs; rel < rel_end; rel++) 949 { 950 unsigned int r_type; 951 unsigned long r_symndx; 952 struct elf_link_hash_entry *h; 953 954 r_symndx = ELF64_R_SYM (rel->r_info); 955 956 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 957 { 958 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 959 abfd, 960 r_symndx); 961 return FALSE; 962 } 963 964 if (r_symndx < symtab_hdr->sh_info) 965 h = NULL; 966 else 967 { 968 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 969 while (h->root.type == bfd_link_hash_indirect 970 || h->root.type == bfd_link_hash_warning) 971 h = (struct elf_link_hash_entry *) h->root.u.i.link; 972 } 973 974 /* Create got section and local_got_refcounts array if they 975 are needed. */ 976 r_type = elf_s390_tls_transition (info, 977 ELF64_R_TYPE (rel->r_info), 978 h == NULL); 979 switch (r_type) 980 { 981 case R_390_GOT12: 982 case R_390_GOT16: 983 case R_390_GOT20: 984 case R_390_GOT32: 985 case R_390_GOT64: 986 case R_390_GOTENT: 987 case R_390_GOTPLT12: 988 case R_390_GOTPLT16: 989 case R_390_GOTPLT20: 990 case R_390_GOTPLT32: 991 case R_390_GOTPLT64: 992 case R_390_GOTPLTENT: 993 case R_390_TLS_GD64: 994 case R_390_TLS_GOTIE12: 995 case R_390_TLS_GOTIE20: 996 case R_390_TLS_GOTIE64: 997 case R_390_TLS_IEENT: 998 case R_390_TLS_IE64: 999 case R_390_TLS_LDM64: 1000 if (h == NULL 1001 && local_got_refcounts == NULL) 1002 { 1003 bfd_size_type size; 1004 1005 size = symtab_hdr->sh_info; 1006 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 1007 local_got_refcounts = ((bfd_signed_vma *) 1008 bfd_zalloc (abfd, size)); 1009 if (local_got_refcounts == NULL) 1010 return FALSE; 1011 elf_local_got_refcounts (abfd) = local_got_refcounts; 1012 elf_s390_local_got_tls_type (abfd) 1013 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 1014 } 1015 /* Fall through. */ 1016 case R_390_GOTOFF16: 1017 case R_390_GOTOFF32: 1018 case R_390_GOTOFF64: 1019 case R_390_GOTPC: 1020 case R_390_GOTPCDBL: 1021 if (htab->sgot == NULL) 1022 { 1023 if (htab->elf.dynobj == NULL) 1024 htab->elf.dynobj = abfd; 1025 if (!create_got_section (htab->elf.dynobj, info)) 1026 return FALSE; 1027 } 1028 } 1029 1030 switch (r_type) 1031 { 1032 case R_390_GOTOFF16: 1033 case R_390_GOTOFF32: 1034 case R_390_GOTOFF64: 1035 case R_390_GOTPC: 1036 case R_390_GOTPCDBL: 1037 /* Got is created, nothing to be done. */ 1038 break; 1039 1040 case R_390_PLT16DBL: 1041 case R_390_PLT32: 1042 case R_390_PLT32DBL: 1043 case R_390_PLT64: 1044 case R_390_PLTOFF16: 1045 case R_390_PLTOFF32: 1046 case R_390_PLTOFF64: 1047 /* This symbol requires a procedure linkage table entry. We 1048 actually build the entry in adjust_dynamic_symbol, 1049 because this might be a case of linking PIC code which is 1050 never referenced by a dynamic object, in which case we 1051 don't need to generate a procedure linkage table entry 1052 after all. */ 1053 1054 /* If this is a local symbol, we resolve it directly without 1055 creating a procedure linkage table entry. */ 1056 if (h != NULL) 1057 { 1058 h->needs_plt = 1; 1059 h->plt.refcount += 1; 1060 } 1061 break; 1062 1063 case R_390_GOTPLT12: 1064 case R_390_GOTPLT16: 1065 case R_390_GOTPLT20: 1066 case R_390_GOTPLT32: 1067 case R_390_GOTPLT64: 1068 case R_390_GOTPLTENT: 1069 /* This symbol requires either a procedure linkage table entry 1070 or an entry in the local got. We actually build the entry 1071 in adjust_dynamic_symbol because whether this is really a 1072 global reference can change and with it the fact if we have 1073 to create a plt entry or a local got entry. To be able to 1074 make a once global symbol a local one we have to keep track 1075 of the number of gotplt references that exist for this 1076 symbol. */ 1077 if (h != NULL) 1078 { 1079 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1080 h->needs_plt = 1; 1081 h->plt.refcount += 1; 1082 } 1083 else 1084 local_got_refcounts[r_symndx] += 1; 1085 break; 1086 1087 case R_390_TLS_LDM64: 1088 htab->tls_ldm_got.refcount += 1; 1089 break; 1090 1091 case R_390_TLS_IE64: 1092 case R_390_TLS_GOTIE12: 1093 case R_390_TLS_GOTIE20: 1094 case R_390_TLS_GOTIE64: 1095 case R_390_TLS_IEENT: 1096 if (info->shared) 1097 info->flags |= DF_STATIC_TLS; 1098 /* Fall through */ 1099 1100 case R_390_GOT12: 1101 case R_390_GOT16: 1102 case R_390_GOT20: 1103 case R_390_GOT32: 1104 case R_390_GOT64: 1105 case R_390_GOTENT: 1106 case R_390_TLS_GD64: 1107 /* This symbol requires a global offset table entry. */ 1108 switch (r_type) 1109 { 1110 default: 1111 case R_390_GOT12: 1112 case R_390_GOT16: 1113 case R_390_GOT20: 1114 case R_390_GOT32: 1115 case R_390_GOTENT: 1116 tls_type = GOT_NORMAL; 1117 break; 1118 case R_390_TLS_GD64: 1119 tls_type = GOT_TLS_GD; 1120 break; 1121 case R_390_TLS_IE64: 1122 case R_390_TLS_GOTIE64: 1123 tls_type = GOT_TLS_IE; 1124 break; 1125 case R_390_TLS_GOTIE12: 1126 case R_390_TLS_GOTIE20: 1127 case R_390_TLS_IEENT: 1128 tls_type = GOT_TLS_IE_NLT; 1129 break; 1130 } 1131 1132 if (h != NULL) 1133 { 1134 h->got.refcount += 1; 1135 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1136 } 1137 else 1138 { 1139 local_got_refcounts[r_symndx] += 1; 1140 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1141 } 1142 /* If a TLS symbol is accessed using IE at least once, 1143 there is no point to use dynamic model for it. */ 1144 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1145 { 1146 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1147 { 1148 (*_bfd_error_handler) 1149 (_("%B: `%s' accessed both as normal and thread local symbol"), 1150 abfd, h->root.root.string); 1151 return FALSE; 1152 } 1153 if (old_tls_type > tls_type) 1154 tls_type = old_tls_type; 1155 } 1156 1157 if (old_tls_type != tls_type) 1158 { 1159 if (h != NULL) 1160 elf_s390_hash_entry (h)->tls_type = tls_type; 1161 else 1162 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1163 } 1164 1165 if (r_type != R_390_TLS_IE64) 1166 break; 1167 /* Fall through */ 1168 1169 case R_390_TLS_LE64: 1170 if (!info->shared) 1171 break; 1172 info->flags |= DF_STATIC_TLS; 1173 /* Fall through */ 1174 1175 case R_390_8: 1176 case R_390_16: 1177 case R_390_32: 1178 case R_390_64: 1179 case R_390_PC16: 1180 case R_390_PC16DBL: 1181 case R_390_PC32: 1182 case R_390_PC32DBL: 1183 case R_390_PC64: 1184 if (h != NULL && !info->shared) 1185 { 1186 /* If this reloc is in a read-only section, we might 1187 need a copy reloc. We can't check reliably at this 1188 stage whether the section is read-only, as input 1189 sections have not yet been mapped to output sections. 1190 Tentatively set the flag for now, and correct in 1191 adjust_dynamic_symbol. */ 1192 h->non_got_ref = 1; 1193 1194 /* We may need a .plt entry if the function this reloc 1195 refers to is in a shared lib. */ 1196 h->plt.refcount += 1; 1197 } 1198 1199 /* If we are creating a shared library, and this is a reloc 1200 against a global symbol, or a non PC relative reloc 1201 against a local symbol, then we need to copy the reloc 1202 into the shared library. However, if we are linking with 1203 -Bsymbolic, we do not need to copy a reloc against a 1204 global symbol which is defined in an object we are 1205 including in the link (i.e., DEF_REGULAR is set). At 1206 this point we have not seen all the input files, so it is 1207 possible that DEF_REGULAR is not set now but will be set 1208 later (it is never cleared). In case of a weak definition, 1209 DEF_REGULAR may be cleared later by a strong definition in 1210 a shared library. We account for that possibility below by 1211 storing information in the relocs_copied field of the hash 1212 table entry. A similar situation occurs when creating 1213 shared libraries and symbol visibility changes render the 1214 symbol local. 1215 1216 If on the other hand, we are creating an executable, we 1217 may need to keep relocations for symbols satisfied by a 1218 dynamic library if we manage to avoid copy relocs for the 1219 symbol. */ 1220 if ((info->shared 1221 && (sec->flags & SEC_ALLOC) != 0 1222 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 1223 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL 1224 && ELF64_R_TYPE (rel->r_info) != R_390_PC32 1225 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL 1226 && ELF64_R_TYPE (rel->r_info) != R_390_PC64) 1227 || (h != NULL 1228 && (! info->symbolic 1229 || h->root.type == bfd_link_hash_defweak 1230 || !h->def_regular)))) 1231 || (ELIMINATE_COPY_RELOCS 1232 && !info->shared 1233 && (sec->flags & SEC_ALLOC) != 0 1234 && h != NULL 1235 && (h->root.type == bfd_link_hash_defweak 1236 || !h->def_regular))) 1237 { 1238 struct elf_s390_dyn_relocs *p; 1239 struct elf_s390_dyn_relocs **head; 1240 1241 /* We must copy these reloc types into the output file. 1242 Create a reloc section in dynobj and make room for 1243 this reloc. */ 1244 if (sreloc == NULL) 1245 { 1246 const char *name; 1247 bfd *dynobj; 1248 1249 name = (bfd_elf_string_from_elf_section 1250 (abfd, 1251 elf_elfheader (abfd)->e_shstrndx, 1252 elf_section_data (sec)->rel_hdr.sh_name)); 1253 if (name == NULL) 1254 return FALSE; 1255 1256 if (! CONST_STRNEQ (name, ".rela") 1257 || strcmp (bfd_get_section_name (abfd, sec), 1258 name + 5) != 0) 1259 { 1260 (*_bfd_error_handler) 1261 (_("%B: bad relocation section name `%s\'"), 1262 abfd, name); 1263 } 1264 1265 if (htab->elf.dynobj == NULL) 1266 htab->elf.dynobj = abfd; 1267 1268 dynobj = htab->elf.dynobj; 1269 sreloc = bfd_get_section_by_name (dynobj, name); 1270 if (sreloc == NULL) 1271 { 1272 flagword flags; 1273 1274 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1275 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1276 if ((sec->flags & SEC_ALLOC) != 0) 1277 flags |= SEC_ALLOC | SEC_LOAD; 1278 sreloc = bfd_make_section_with_flags (dynobj, 1279 name, 1280 flags); 1281 if (sreloc == NULL 1282 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 1283 return FALSE; 1284 } 1285 elf_section_data (sec)->sreloc = sreloc; 1286 } 1287 1288 /* If this is a global symbol, we count the number of 1289 relocations we need for this symbol. */ 1290 if (h != NULL) 1291 { 1292 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1293 } 1294 else 1295 { 1296 /* Track dynamic relocs needed for local syms too. 1297 We really need local syms available to do this 1298 easily. Oh well. */ 1299 1300 asection *s; 1301 void *vpp; 1302 1303 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1304 sec, r_symndx); 1305 if (s == NULL) 1306 return FALSE; 1307 1308 vpp = &elf_section_data (s)->local_dynrel; 1309 head = (struct elf_s390_dyn_relocs **) vpp; 1310 } 1311 1312 p = *head; 1313 if (p == NULL || p->sec != sec) 1314 { 1315 bfd_size_type amt = sizeof *p; 1316 p = ((struct elf_s390_dyn_relocs *) 1317 bfd_alloc (htab->elf.dynobj, amt)); 1318 if (p == NULL) 1319 return FALSE; 1320 p->next = *head; 1321 *head = p; 1322 p->sec = sec; 1323 p->count = 0; 1324 p->pc_count = 0; 1325 } 1326 1327 p->count += 1; 1328 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 1329 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1330 || ELF64_R_TYPE (rel->r_info) == R_390_PC32 1331 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL 1332 || ELF64_R_TYPE (rel->r_info) == R_390_PC64) 1333 p->pc_count += 1; 1334 } 1335 break; 1336 1337 /* This relocation describes the C++ object vtable hierarchy. 1338 Reconstruct it for later use during GC. */ 1339 case R_390_GNU_VTINHERIT: 1340 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1341 return FALSE; 1342 break; 1343 1344 /* This relocation describes which C++ vtable entries are actually 1345 used. Record for later use during GC. */ 1346 case R_390_GNU_VTENTRY: 1347 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1348 return FALSE; 1349 break; 1350 1351 default: 1352 break; 1353 } 1354 } 1355 1356 return TRUE; 1357} 1358 1359/* Return the section that should be marked against GC for a given 1360 relocation. */ 1361 1362static asection * 1363elf_s390_gc_mark_hook (asection *sec, 1364 struct bfd_link_info *info, 1365 Elf_Internal_Rela *rel, 1366 struct elf_link_hash_entry *h, 1367 Elf_Internal_Sym *sym) 1368{ 1369 if (h != NULL) 1370 switch (ELF64_R_TYPE (rel->r_info)) 1371 { 1372 case R_390_GNU_VTINHERIT: 1373 case R_390_GNU_VTENTRY: 1374 return NULL; 1375 } 1376 1377 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1378} 1379 1380/* Update the got entry reference counts for the section being removed. */ 1381 1382static bfd_boolean 1383elf_s390_gc_sweep_hook (bfd *abfd, 1384 struct bfd_link_info *info, 1385 asection *sec, 1386 const Elf_Internal_Rela *relocs) 1387{ 1388 Elf_Internal_Shdr *symtab_hdr; 1389 struct elf_link_hash_entry **sym_hashes; 1390 bfd_signed_vma *local_got_refcounts; 1391 const Elf_Internal_Rela *rel, *relend; 1392 1393 elf_section_data (sec)->local_dynrel = NULL; 1394 1395 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1396 sym_hashes = elf_sym_hashes (abfd); 1397 local_got_refcounts = elf_local_got_refcounts (abfd); 1398 1399 relend = relocs + sec->reloc_count; 1400 for (rel = relocs; rel < relend; rel++) 1401 { 1402 unsigned long r_symndx; 1403 unsigned int r_type; 1404 struct elf_link_hash_entry *h = NULL; 1405 1406 r_symndx = ELF64_R_SYM (rel->r_info); 1407 if (r_symndx >= symtab_hdr->sh_info) 1408 { 1409 struct elf_s390_link_hash_entry *eh; 1410 struct elf_s390_dyn_relocs **pp; 1411 struct elf_s390_dyn_relocs *p; 1412 1413 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1414 while (h->root.type == bfd_link_hash_indirect 1415 || h->root.type == bfd_link_hash_warning) 1416 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1417 eh = (struct elf_s390_link_hash_entry *) h; 1418 1419 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1420 if (p->sec == sec) 1421 { 1422 /* Everything must go for SEC. */ 1423 *pp = p->next; 1424 break; 1425 } 1426 } 1427 1428 r_type = ELF64_R_TYPE (rel->r_info); 1429 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1430 switch (r_type) 1431 { 1432 case R_390_TLS_LDM64: 1433 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1434 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1435 break; 1436 1437 case R_390_TLS_GD64: 1438 case R_390_TLS_IE64: 1439 case R_390_TLS_GOTIE12: 1440 case R_390_TLS_GOTIE20: 1441 case R_390_TLS_GOTIE64: 1442 case R_390_TLS_IEENT: 1443 case R_390_GOT12: 1444 case R_390_GOT16: 1445 case R_390_GOT20: 1446 case R_390_GOT32: 1447 case R_390_GOT64: 1448 case R_390_GOTOFF16: 1449 case R_390_GOTOFF32: 1450 case R_390_GOTOFF64: 1451 case R_390_GOTPC: 1452 case R_390_GOTPCDBL: 1453 case R_390_GOTENT: 1454 if (h != NULL) 1455 { 1456 if (h->got.refcount > 0) 1457 h->got.refcount -= 1; 1458 } 1459 else if (local_got_refcounts != NULL) 1460 { 1461 if (local_got_refcounts[r_symndx] > 0) 1462 local_got_refcounts[r_symndx] -= 1; 1463 } 1464 break; 1465 1466 case R_390_8: 1467 case R_390_12: 1468 case R_390_16: 1469 case R_390_20: 1470 case R_390_32: 1471 case R_390_64: 1472 case R_390_PC16: 1473 case R_390_PC16DBL: 1474 case R_390_PC32: 1475 case R_390_PC32DBL: 1476 case R_390_PC64: 1477 if (info->shared) 1478 break; 1479 /* Fall through */ 1480 1481 case R_390_PLT16DBL: 1482 case R_390_PLT32: 1483 case R_390_PLT32DBL: 1484 case R_390_PLT64: 1485 case R_390_PLTOFF16: 1486 case R_390_PLTOFF32: 1487 case R_390_PLTOFF64: 1488 if (h != NULL) 1489 { 1490 if (h->plt.refcount > 0) 1491 h->plt.refcount -= 1; 1492 } 1493 break; 1494 1495 case R_390_GOTPLT12: 1496 case R_390_GOTPLT16: 1497 case R_390_GOTPLT20: 1498 case R_390_GOTPLT32: 1499 case R_390_GOTPLT64: 1500 case R_390_GOTPLTENT: 1501 if (h != NULL) 1502 { 1503 if (h->plt.refcount > 0) 1504 { 1505 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1506 h->plt.refcount -= 1; 1507 } 1508 } 1509 else if (local_got_refcounts != NULL) 1510 { 1511 if (local_got_refcounts[r_symndx] > 0) 1512 local_got_refcounts[r_symndx] -= 1; 1513 } 1514 break; 1515 1516 default: 1517 break; 1518 } 1519 } 1520 1521 return TRUE; 1522} 1523 1524/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1525 entry but we found we will not create any. Called when we find we will 1526 not have any PLT for this symbol, by for example 1527 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1528 or elf_s390_size_dynamic_sections if no dynamic sections will be 1529 created (we're only linking static objects). */ 1530 1531static void 1532elf_s390_adjust_gotplt (h) 1533 struct elf_s390_link_hash_entry *h; 1534{ 1535 if (h->elf.root.type == bfd_link_hash_warning) 1536 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1537 1538 if (h->gotplt_refcount <= 0) 1539 return; 1540 1541 /* We simply add the number of gotplt references to the number 1542 * of got references for this symbol. */ 1543 h->elf.got.refcount += h->gotplt_refcount; 1544 h->gotplt_refcount = -1; 1545} 1546 1547/* Adjust a symbol defined by a dynamic object and referenced by a 1548 regular object. The current definition is in some section of the 1549 dynamic object, but we're not including those sections. We have to 1550 change the definition to something the rest of the link can 1551 understand. */ 1552 1553static bfd_boolean 1554elf_s390_adjust_dynamic_symbol (info, h) 1555 struct bfd_link_info *info; 1556 struct elf_link_hash_entry *h; 1557{ 1558 struct elf_s390_link_hash_table *htab; 1559 asection *s; 1560 1561 /* If this is a function, put it in the procedure linkage table. We 1562 will fill in the contents of the procedure linkage table later 1563 (although we could actually do it here). */ 1564 if (h->type == STT_FUNC 1565 || h->needs_plt) 1566 { 1567 if (h->plt.refcount <= 0 1568 || (! info->shared 1569 && !h->def_dynamic 1570 && !h->ref_dynamic 1571 && h->root.type != bfd_link_hash_undefweak 1572 && h->root.type != bfd_link_hash_undefined)) 1573 { 1574 /* This case can occur if we saw a PLT32 reloc in an input 1575 file, but the symbol was never referred to by a dynamic 1576 object, or if all references were garbage collected. In 1577 such a case, we don't actually need to build a procedure 1578 linkage table, and we can just do a PC32 reloc instead. */ 1579 h->plt.offset = (bfd_vma) -1; 1580 h->needs_plt = 0; 1581 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1582 } 1583 1584 return TRUE; 1585 } 1586 else 1587 /* It's possible that we incorrectly decided a .plt reloc was 1588 needed for an R_390_PC32 reloc to a non-function sym in 1589 check_relocs. We can't decide accurately between function and 1590 non-function syms in check-relocs; Objects loaded later in 1591 the link may change h->type. So fix it now. */ 1592 h->plt.offset = (bfd_vma) -1; 1593 1594 /* If this is a weak symbol, and there is a real definition, the 1595 processor independent code will have arranged for us to see the 1596 real definition first, and we can just use the same value. */ 1597 if (h->u.weakdef != NULL) 1598 { 1599 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1600 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1601 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1602 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1603 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1604 h->non_got_ref = h->u.weakdef->non_got_ref; 1605 return TRUE; 1606 } 1607 1608 /* This is a reference to a symbol defined by a dynamic object which 1609 is not a function. */ 1610 1611 /* If we are creating a shared library, we must presume that the 1612 only references to the symbol are via the global offset table. 1613 For such cases we need not do anything here; the relocations will 1614 be handled correctly by relocate_section. */ 1615 if (info->shared) 1616 return TRUE; 1617 1618 /* If there are no references to this symbol that do not use the 1619 GOT, we don't need to generate a copy reloc. */ 1620 if (!h->non_got_ref) 1621 return TRUE; 1622 1623 /* If -z nocopyreloc was given, we won't generate them either. */ 1624 if (info->nocopyreloc) 1625 { 1626 h->non_got_ref = 0; 1627 return TRUE; 1628 } 1629 1630 if (ELIMINATE_COPY_RELOCS) 1631 { 1632 struct elf_s390_link_hash_entry * eh; 1633 struct elf_s390_dyn_relocs *p; 1634 1635 eh = (struct elf_s390_link_hash_entry *) h; 1636 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1637 { 1638 s = p->sec->output_section; 1639 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1640 break; 1641 } 1642 1643 /* If we didn't find any dynamic relocs in read-only sections, then 1644 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1645 if (p == NULL) 1646 { 1647 h->non_got_ref = 0; 1648 return TRUE; 1649 } 1650 } 1651 1652 if (h->size == 0) 1653 { 1654 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1655 h->root.root.string); 1656 return TRUE; 1657 } 1658 1659 /* We must allocate the symbol in our .dynbss section, which will 1660 become part of the .bss section of the executable. There will be 1661 an entry for this symbol in the .dynsym section. The dynamic 1662 object will contain position independent code, so all references 1663 from the dynamic object to this symbol will go through the global 1664 offset table. The dynamic linker will use the .dynsym entry to 1665 determine the address it must put in the global offset table, so 1666 both the dynamic object and the regular object will refer to the 1667 same memory location for the variable. */ 1668 1669 htab = elf_s390_hash_table (info); 1670 1671 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1672 copy the initial value out of the dynamic object and into the 1673 runtime process image. */ 1674 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1675 { 1676 htab->srelbss->size += sizeof (Elf64_External_Rela); 1677 h->needs_copy = 1; 1678 } 1679 1680 s = htab->sdynbss; 1681 1682 return _bfd_elf_adjust_dynamic_copy (h, s); 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 htab = elf_s390_hash_table (info); 2242 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2243 sym_hashes = elf_sym_hashes (input_bfd); 2244 local_got_offsets = elf_local_got_offsets (input_bfd); 2245 2246 rel = relocs; 2247 relend = relocs + input_section->reloc_count; 2248 for (; rel < relend; rel++) 2249 { 2250 unsigned int r_type; 2251 reloc_howto_type *howto; 2252 unsigned long r_symndx; 2253 struct elf_link_hash_entry *h; 2254 Elf_Internal_Sym *sym; 2255 asection *sec; 2256 bfd_vma off; 2257 bfd_vma relocation; 2258 bfd_boolean unresolved_reloc; 2259 bfd_reloc_status_type r; 2260 int tls_type; 2261 2262 r_type = ELF64_R_TYPE (rel->r_info); 2263 if (r_type == (int) R_390_GNU_VTINHERIT 2264 || r_type == (int) R_390_GNU_VTENTRY) 2265 continue; 2266 if (r_type >= (int) R_390_max) 2267 { 2268 bfd_set_error (bfd_error_bad_value); 2269 return FALSE; 2270 } 2271 2272 howto = elf_howto_table + r_type; 2273 r_symndx = ELF64_R_SYM (rel->r_info); 2274 2275 h = NULL; 2276 sym = NULL; 2277 sec = NULL; 2278 unresolved_reloc = FALSE; 2279 if (r_symndx < symtab_hdr->sh_info) 2280 { 2281 sym = local_syms + r_symndx; 2282 sec = local_sections[r_symndx]; 2283 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2284 } 2285 else 2286 { 2287 bfd_boolean warned ATTRIBUTE_UNUSED; 2288 2289 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2290 r_symndx, symtab_hdr, sym_hashes, 2291 h, sec, relocation, 2292 unresolved_reloc, warned); 2293 } 2294 2295 if (sec != NULL && elf_discarded_section (sec)) 2296 { 2297 /* For relocs against symbols from removed linkonce sections, 2298 or sections discarded by a linker script, we just want the 2299 section contents zeroed. Avoid any special processing. */ 2300 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 2301 rel->r_info = 0; 2302 rel->r_addend = 0; 2303 continue; 2304 } 2305 2306 if (info->relocatable) 2307 continue; 2308 2309 switch (r_type) 2310 { 2311 case R_390_GOTPLT12: 2312 case R_390_GOTPLT16: 2313 case R_390_GOTPLT20: 2314 case R_390_GOTPLT32: 2315 case R_390_GOTPLT64: 2316 case R_390_GOTPLTENT: 2317 /* There are three cases for a GOTPLT relocation. 1) The 2318 relocation is against the jump slot entry of a plt that 2319 will get emitted to the output file. 2) The relocation 2320 is against the jump slot of a plt entry that has been 2321 removed. elf_s390_adjust_gotplt has created a GOT entry 2322 as replacement. 3) The relocation is against a local symbol. 2323 Cases 2) and 3) are the same as the GOT relocation code 2324 so we just have to test for case 1 and fall through for 2325 the other two. */ 2326 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2327 { 2328 bfd_vma plt_index; 2329 2330 /* Calc. index no. 2331 Current offset - size first entry / entry size. */ 2332 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2333 PLT_ENTRY_SIZE; 2334 2335 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 2336 addr & GOT addr. */ 2337 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2338 unresolved_reloc = FALSE; 2339 2340 if (r_type == R_390_GOTPLTENT) 2341 relocation += htab->sgot->output_section->vma; 2342 break; 2343 } 2344 /* Fall through. */ 2345 2346 case R_390_GOT12: 2347 case R_390_GOT16: 2348 case R_390_GOT20: 2349 case R_390_GOT32: 2350 case R_390_GOT64: 2351 case R_390_GOTENT: 2352 /* Relocation is to the entry for this symbol in the global 2353 offset table. */ 2354 if (htab->sgot == NULL) 2355 abort (); 2356 2357 if (h != NULL) 2358 { 2359 bfd_boolean dyn; 2360 2361 off = h->got.offset; 2362 dyn = htab->elf.dynamic_sections_created; 2363 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2364 || (info->shared 2365 && (info->symbolic 2366 || h->dynindx == -1 2367 || h->forced_local) 2368 && h->def_regular) 2369 || (ELF_ST_VISIBILITY (h->other) 2370 && h->root.type == bfd_link_hash_undefweak)) 2371 { 2372 /* This is actually a static link, or it is a 2373 -Bsymbolic link and the symbol is defined 2374 locally, or the symbol was forced to be local 2375 because of a version file. We must initialize 2376 this entry in the global offset table. Since the 2377 offset must always be a multiple of 2, we use the 2378 least significant bit to record whether we have 2379 initialized it already. 2380 2381 When doing a dynamic link, we create a .rel.got 2382 relocation entry to initialize the value. This 2383 is done in the finish_dynamic_symbol routine. */ 2384 if ((off & 1) != 0) 2385 off &= ~1; 2386 else 2387 { 2388 bfd_put_64 (output_bfd, relocation, 2389 htab->sgot->contents + off); 2390 h->got.offset |= 1; 2391 } 2392 } 2393 else 2394 unresolved_reloc = FALSE; 2395 } 2396 else 2397 { 2398 if (local_got_offsets == NULL) 2399 abort (); 2400 2401 off = local_got_offsets[r_symndx]; 2402 2403 /* The offset must always be a multiple of 8. We use 2404 the least significant bit to record whether we have 2405 already generated the necessary reloc. */ 2406 if ((off & 1) != 0) 2407 off &= ~1; 2408 else 2409 { 2410 bfd_put_64 (output_bfd, relocation, 2411 htab->sgot->contents + off); 2412 2413 if (info->shared) 2414 { 2415 asection *s; 2416 Elf_Internal_Rela outrel; 2417 bfd_byte *loc; 2418 2419 s = htab->srelgot; 2420 if (s == NULL) 2421 abort (); 2422 2423 outrel.r_offset = (htab->sgot->output_section->vma 2424 + htab->sgot->output_offset 2425 + off); 2426 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2427 outrel.r_addend = relocation; 2428 loc = s->contents; 2429 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2430 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2431 } 2432 2433 local_got_offsets[r_symndx] |= 1; 2434 } 2435 } 2436 2437 if (off >= (bfd_vma) -2) 2438 abort (); 2439 2440 relocation = htab->sgot->output_offset + off; 2441 2442 /* For @GOTENT the relocation is against the offset between 2443 the instruction and the symbols entry in the GOT and not 2444 between the start of the GOT and the symbols entry. We 2445 add the vma of the GOT to get the correct value. */ 2446 if ( r_type == R_390_GOTENT 2447 || r_type == R_390_GOTPLTENT) 2448 relocation += htab->sgot->output_section->vma; 2449 2450 break; 2451 2452 case R_390_GOTOFF16: 2453 case R_390_GOTOFF32: 2454 case R_390_GOTOFF64: 2455 /* Relocation is relative to the start of the global offset 2456 table. */ 2457 2458 /* Note that sgot->output_offset is not involved in this 2459 calculation. We always want the start of .got. If we 2460 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2461 permitted by the ABI, we might have to change this 2462 calculation. */ 2463 relocation -= htab->sgot->output_section->vma; 2464 break; 2465 2466 case R_390_GOTPC: 2467 case R_390_GOTPCDBL: 2468 /* Use global offset table as symbol value. */ 2469 relocation = htab->sgot->output_section->vma; 2470 unresolved_reloc = FALSE; 2471 break; 2472 2473 case R_390_PLT16DBL: 2474 case R_390_PLT32: 2475 case R_390_PLT32DBL: 2476 case R_390_PLT64: 2477 /* Relocation is to the entry for this symbol in the 2478 procedure linkage table. */ 2479 2480 /* Resolve a PLT32 reloc against a local symbol directly, 2481 without using the procedure linkage table. */ 2482 if (h == NULL) 2483 break; 2484 2485 if (h->plt.offset == (bfd_vma) -1 2486 || htab->splt == NULL) 2487 { 2488 /* We didn't make a PLT entry for this symbol. This 2489 happens when statically linking PIC code, or when 2490 using -Bsymbolic. */ 2491 break; 2492 } 2493 2494 relocation = (htab->splt->output_section->vma 2495 + htab->splt->output_offset 2496 + h->plt.offset); 2497 unresolved_reloc = FALSE; 2498 break; 2499 2500 case R_390_PLTOFF16: 2501 case R_390_PLTOFF32: 2502 case R_390_PLTOFF64: 2503 /* Relocation is to the entry for this symbol in the 2504 procedure linkage table relative to the start of the GOT. */ 2505 2506 /* For local symbols or if we didn't make a PLT entry for 2507 this symbol resolve the symbol directly. */ 2508 if ( h == NULL 2509 || h->plt.offset == (bfd_vma) -1 2510 || htab->splt == NULL) 2511 { 2512 relocation -= htab->sgot->output_section->vma; 2513 break; 2514 } 2515 2516 relocation = (htab->splt->output_section->vma 2517 + htab->splt->output_offset 2518 + h->plt.offset 2519 - htab->sgot->output_section->vma); 2520 unresolved_reloc = FALSE; 2521 break; 2522 2523 case R_390_8: 2524 case R_390_16: 2525 case R_390_32: 2526 case R_390_64: 2527 case R_390_PC16: 2528 case R_390_PC16DBL: 2529 case R_390_PC32: 2530 case R_390_PC32DBL: 2531 case R_390_PC64: 2532 if ((input_section->flags & SEC_ALLOC) == 0) 2533 break; 2534 2535 if ((info->shared 2536 && (h == NULL 2537 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2538 || h->root.type != bfd_link_hash_undefweak) 2539 && ((r_type != R_390_PC16 2540 && r_type != R_390_PC16DBL 2541 && r_type != R_390_PC32 2542 && r_type != R_390_PC32DBL 2543 && r_type != R_390_PC64) 2544 || (h != NULL 2545 && !SYMBOL_REFERENCES_LOCAL (info, h)))) 2546 || (ELIMINATE_COPY_RELOCS 2547 && !info->shared 2548 && h != NULL 2549 && h->dynindx != -1 2550 && !h->non_got_ref 2551 && ((h->def_dynamic 2552 && !h->def_regular) 2553 || h->root.type == bfd_link_hash_undefweak 2554 || h->root.type == bfd_link_hash_undefined))) 2555 { 2556 Elf_Internal_Rela outrel; 2557 bfd_boolean skip, relocate; 2558 asection *sreloc; 2559 bfd_byte *loc; 2560 2561 /* When generating a shared object, these relocations 2562 are copied into the output file to be resolved at run 2563 time. */ 2564 skip = FALSE; 2565 relocate = FALSE; 2566 2567 outrel.r_offset = 2568 _bfd_elf_section_offset (output_bfd, info, input_section, 2569 rel->r_offset); 2570 if (outrel.r_offset == (bfd_vma) -1) 2571 skip = TRUE; 2572 else if (outrel.r_offset == (bfd_vma) -2) 2573 skip = TRUE, relocate = TRUE; 2574 2575 outrel.r_offset += (input_section->output_section->vma 2576 + input_section->output_offset); 2577 2578 if (skip) 2579 memset (&outrel, 0, sizeof outrel); 2580 else if (h != NULL 2581 && h->dynindx != -1 2582 && (r_type == R_390_PC16 2583 || r_type == R_390_PC16DBL 2584 || r_type == R_390_PC32 2585 || r_type == R_390_PC32DBL 2586 || r_type == R_390_PC64 2587 || !info->shared 2588 || !info->symbolic 2589 || !h->def_regular)) 2590 { 2591 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2592 outrel.r_addend = rel->r_addend; 2593 } 2594 else 2595 { 2596 /* This symbol is local, or marked to become local. */ 2597 outrel.r_addend = relocation + rel->r_addend; 2598 if (r_type == R_390_64) 2599 { 2600 relocate = TRUE; 2601 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2602 } 2603 else 2604 { 2605 long sindx; 2606 2607 if (bfd_is_abs_section (sec)) 2608 sindx = 0; 2609 else if (sec == NULL || sec->owner == NULL) 2610 { 2611 bfd_set_error(bfd_error_bad_value); 2612 return FALSE; 2613 } 2614 else 2615 { 2616 asection *osec; 2617 2618 osec = sec->output_section; 2619 sindx = elf_section_data (osec)->dynindx; 2620 2621 if (sindx == 0) 2622 { 2623 osec = htab->elf.text_index_section; 2624 sindx = elf_section_data (osec)->dynindx; 2625 } 2626 BFD_ASSERT (sindx != 0); 2627 2628 /* We are turning this relocation into one 2629 against a section symbol, so subtract out 2630 the output section's address but not the 2631 offset of the input section in the output 2632 section. */ 2633 outrel.r_addend -= osec->vma; 2634 } 2635 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2636 } 2637 } 2638 2639 sreloc = elf_section_data (input_section)->sreloc; 2640 if (sreloc == NULL) 2641 abort (); 2642 2643 loc = sreloc->contents; 2644 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2645 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2646 2647 /* If this reloc is against an external symbol, we do 2648 not want to fiddle with the addend. Otherwise, we 2649 need to include the symbol value so that it becomes 2650 an addend for the dynamic reloc. */ 2651 if (! relocate) 2652 continue; 2653 } 2654 2655 break; 2656 2657 /* Relocations for tls literal pool entries. */ 2658 case R_390_TLS_IE64: 2659 if (info->shared) 2660 { 2661 Elf_Internal_Rela outrel; 2662 asection *sreloc; 2663 bfd_byte *loc; 2664 2665 outrel.r_offset = rel->r_offset 2666 + input_section->output_section->vma 2667 + input_section->output_offset; 2668 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2669 sreloc = elf_section_data (input_section)->sreloc; 2670 if (sreloc == NULL) 2671 abort (); 2672 loc = sreloc->contents; 2673 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2674 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc); 2675 } 2676 /* Fall through. */ 2677 2678 case R_390_TLS_GD64: 2679 case R_390_TLS_GOTIE64: 2680 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2681 tls_type = GOT_UNKNOWN; 2682 if (h == NULL && local_got_offsets) 2683 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2684 else if (h != NULL) 2685 { 2686 tls_type = elf_s390_hash_entry(h)->tls_type; 2687 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2688 r_type = R_390_TLS_LE64; 2689 } 2690 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE) 2691 r_type = R_390_TLS_IE64; 2692 2693 if (r_type == R_390_TLS_LE64) 2694 { 2695 /* This relocation gets optimized away by the local exec 2696 access optimization. */ 2697 BFD_ASSERT (! unresolved_reloc); 2698 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2699 contents + rel->r_offset); 2700 continue; 2701 } 2702 2703 if (htab->sgot == NULL) 2704 abort (); 2705 2706 if (h != NULL) 2707 off = h->got.offset; 2708 else 2709 { 2710 if (local_got_offsets == NULL) 2711 abort (); 2712 2713 off = local_got_offsets[r_symndx]; 2714 } 2715 2716 emit_tls_relocs: 2717 2718 if ((off & 1) != 0) 2719 off &= ~1; 2720 else 2721 { 2722 Elf_Internal_Rela outrel; 2723 bfd_byte *loc; 2724 int dr_type, indx; 2725 2726 if (htab->srelgot == NULL) 2727 abort (); 2728 2729 outrel.r_offset = (htab->sgot->output_section->vma 2730 + htab->sgot->output_offset + off); 2731 2732 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2733 if (r_type == R_390_TLS_GD64) 2734 dr_type = R_390_TLS_DTPMOD; 2735 else 2736 dr_type = R_390_TLS_TPOFF; 2737 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2738 outrel.r_addend = relocation - dtpoff_base (info); 2739 else 2740 outrel.r_addend = 0; 2741 outrel.r_info = ELF64_R_INFO (indx, dr_type); 2742 loc = htab->srelgot->contents; 2743 loc += htab->srelgot->reloc_count++ 2744 * sizeof (Elf64_External_Rela); 2745 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2746 2747 if (r_type == R_390_TLS_GD64) 2748 { 2749 if (indx == 0) 2750 { 2751 BFD_ASSERT (! unresolved_reloc); 2752 bfd_put_64 (output_bfd, 2753 relocation - dtpoff_base (info), 2754 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2755 } 2756 else 2757 { 2758 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF); 2759 outrel.r_offset += GOT_ENTRY_SIZE; 2760 outrel.r_addend = 0; 2761 htab->srelgot->reloc_count++; 2762 loc += sizeof (Elf64_External_Rela); 2763 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2764 } 2765 } 2766 2767 if (h != NULL) 2768 h->got.offset |= 1; 2769 else 2770 local_got_offsets[r_symndx] |= 1; 2771 } 2772 2773 if (off >= (bfd_vma) -2) 2774 abort (); 2775 if (r_type == ELF64_R_TYPE (rel->r_info)) 2776 { 2777 relocation = htab->sgot->output_offset + off; 2778 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT) 2779 relocation += htab->sgot->output_section->vma; 2780 unresolved_reloc = FALSE; 2781 } 2782 else 2783 { 2784 bfd_put_64 (output_bfd, htab->sgot->output_offset + off, 2785 contents + rel->r_offset); 2786 continue; 2787 } 2788 break; 2789 2790 case R_390_TLS_GOTIE12: 2791 case R_390_TLS_GOTIE20: 2792 case R_390_TLS_IEENT: 2793 if (h == NULL) 2794 { 2795 if (local_got_offsets == NULL) 2796 abort(); 2797 off = local_got_offsets[r_symndx]; 2798 if (info->shared) 2799 goto emit_tls_relocs; 2800 } 2801 else 2802 { 2803 off = h->got.offset; 2804 tls_type = elf_s390_hash_entry(h)->tls_type; 2805 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 2806 goto emit_tls_relocs; 2807 } 2808 2809 if (htab->sgot == NULL) 2810 abort (); 2811 2812 BFD_ASSERT (! unresolved_reloc); 2813 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2814 htab->sgot->contents + off); 2815 relocation = htab->sgot->output_offset + off; 2816 if (r_type == R_390_TLS_IEENT) 2817 relocation += htab->sgot->output_section->vma; 2818 unresolved_reloc = FALSE; 2819 break; 2820 2821 case R_390_TLS_LDM64: 2822 if (! info->shared) 2823 /* The literal pool entry this relocation refers to gets ignored 2824 by the optimized code of the local exec model. Do nothing 2825 and the value will turn out zero. */ 2826 continue; 2827 2828 if (htab->sgot == NULL) 2829 abort (); 2830 2831 off = htab->tls_ldm_got.offset; 2832 if (off & 1) 2833 off &= ~1; 2834 else 2835 { 2836 Elf_Internal_Rela outrel; 2837 bfd_byte *loc; 2838 2839 if (htab->srelgot == NULL) 2840 abort (); 2841 2842 outrel.r_offset = (htab->sgot->output_section->vma 2843 + htab->sgot->output_offset + off); 2844 2845 bfd_put_64 (output_bfd, 0, 2846 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2847 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD); 2848 outrel.r_addend = 0; 2849 loc = htab->srelgot->contents; 2850 loc += htab->srelgot->reloc_count++ 2851 * sizeof (Elf64_External_Rela); 2852 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2853 htab->tls_ldm_got.offset |= 1; 2854 } 2855 relocation = htab->sgot->output_offset + off; 2856 unresolved_reloc = FALSE; 2857 break; 2858 2859 case R_390_TLS_LE64: 2860 if (info->shared) 2861 { 2862 /* Linking a shared library with non-fpic code requires 2863 a R_390_TLS_TPOFF relocation. */ 2864 Elf_Internal_Rela outrel; 2865 asection *sreloc; 2866 bfd_byte *loc; 2867 int indx; 2868 2869 outrel.r_offset = rel->r_offset 2870 + input_section->output_section->vma 2871 + input_section->output_offset; 2872 if (h != NULL && h->dynindx != -1) 2873 indx = h->dynindx; 2874 else 2875 indx = 0; 2876 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF); 2877 if (indx == 0) 2878 outrel.r_addend = relocation - dtpoff_base (info); 2879 else 2880 outrel.r_addend = 0; 2881 sreloc = elf_section_data (input_section)->sreloc; 2882 if (sreloc == NULL) 2883 abort (); 2884 loc = sreloc->contents; 2885 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2886 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2887 } 2888 else 2889 { 2890 BFD_ASSERT (! unresolved_reloc); 2891 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2892 contents + rel->r_offset); 2893 } 2894 continue; 2895 2896 case R_390_TLS_LDO64: 2897 if (info->shared) 2898 relocation -= dtpoff_base (info); 2899 else 2900 /* When converting LDO to LE, we must negate. */ 2901 relocation = -tpoff (info, relocation); 2902 break; 2903 2904 /* Relocations for tls instructions. */ 2905 case R_390_TLS_LOAD: 2906 case R_390_TLS_GDCALL: 2907 case R_390_TLS_LDCALL: 2908 tls_type = GOT_UNKNOWN; 2909 if (h == NULL && local_got_offsets) 2910 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2911 else if (h != NULL) 2912 tls_type = elf_s390_hash_entry(h)->tls_type; 2913 2914 if (tls_type == GOT_TLS_GD) 2915 continue; 2916 2917 if (r_type == R_390_TLS_LOAD) 2918 { 2919 if (!info->shared && (h == NULL || h->dynindx == -1)) 2920 { 2921 /* IE->LE transition. Four valid cases: 2922 lg %rx,(0,%ry) -> sllg %rx,%ry,0 2923 lg %rx,(%ry,0) -> sllg %rx,%ry,0 2924 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 2925 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */ 2926 unsigned int insn0, insn1, ry; 2927 2928 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2929 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2930 if (insn1 != 0x0004) 2931 invalid_tls_insn (input_bfd, input_section, rel); 2932 ry = 0; 2933 if ((insn0 & 0xff00f000) == 0xe3000000) 2934 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */ 2935 ry = (insn0 & 0x000f0000); 2936 else if ((insn0 & 0xff0f0000) == 0xe3000000) 2937 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */ 2938 ry = (insn0 & 0x0000f000) << 4; 2939 else if ((insn0 & 0xff00f000) == 0xe300c000) 2940 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */ 2941 ry = (insn0 & 0x000f0000); 2942 else if ((insn0 & 0xff0f0000) == 0xe30c0000) 2943 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */ 2944 ry = (insn0 & 0x0000f000) << 4; 2945 else 2946 invalid_tls_insn (input_bfd, input_section, rel); 2947 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry; 2948 insn1 = 0x000d; 2949 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2950 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2951 } 2952 } 2953 else if (r_type == R_390_TLS_GDCALL) 2954 { 2955 unsigned int insn0, insn1; 2956 2957 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2958 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2959 if ((insn0 & 0xffff0000) != 0xc0e50000) 2960 invalid_tls_insn (input_bfd, input_section, rel); 2961 if (!info->shared && (h == NULL || h->dynindx == -1)) 2962 { 2963 /* GD->LE transition. 2964 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2965 insn0 = 0xc0040000; 2966 insn1 = 0x0000; 2967 } 2968 else 2969 { 2970 /* GD->IE transition. 2971 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */ 2972 insn0 = 0xe322c000; 2973 insn1 = 0x0004; 2974 } 2975 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2976 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2977 } 2978 else if (r_type == R_390_TLS_LDCALL) 2979 { 2980 if (!info->shared) 2981 { 2982 unsigned int insn0, insn1; 2983 2984 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 2985 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 2986 if ((insn0 & 0xffff0000) != 0xc0e50000) 2987 invalid_tls_insn (input_bfd, input_section, rel); 2988 /* LD->LE transition. 2989 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 2990 insn0 = 0xc0040000; 2991 insn1 = 0x0000; 2992 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 2993 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 2994 } 2995 } 2996 continue; 2997 2998 default: 2999 break; 3000 } 3001 3002 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3003 because such sections are not SEC_ALLOC and thus ld.so will 3004 not process them. */ 3005 if (unresolved_reloc 3006 && !((input_section->flags & SEC_DEBUGGING) != 0 3007 && h->def_dynamic)) 3008 (*_bfd_error_handler) 3009 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3010 input_bfd, 3011 input_section, 3012 (long) rel->r_offset, 3013 howto->name, 3014 h->root.root.string); 3015 3016 if (r_type == R_390_20 3017 || r_type == R_390_GOT20 3018 || r_type == R_390_GOTPLT20 3019 || r_type == R_390_TLS_GOTIE20) 3020 { 3021 relocation += rel->r_addend; 3022 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3023 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3024 contents, rel->r_offset, 3025 relocation, 0); 3026 } 3027 else 3028 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3029 contents, rel->r_offset, 3030 relocation, rel->r_addend); 3031 3032 if (r != bfd_reloc_ok) 3033 { 3034 const char *name; 3035 3036 if (h != NULL) 3037 name = h->root.root.string; 3038 else 3039 { 3040 name = bfd_elf_string_from_elf_section (input_bfd, 3041 symtab_hdr->sh_link, 3042 sym->st_name); 3043 if (name == NULL) 3044 return FALSE; 3045 if (*name == '\0') 3046 name = bfd_section_name (input_bfd, sec); 3047 } 3048 3049 if (r == bfd_reloc_overflow) 3050 { 3051 3052 if (! ((*info->callbacks->reloc_overflow) 3053 (info, (h ? &h->root : NULL), name, howto->name, 3054 (bfd_vma) 0, input_bfd, input_section, 3055 rel->r_offset))) 3056 return FALSE; 3057 } 3058 else 3059 { 3060 (*_bfd_error_handler) 3061 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3062 input_bfd, input_section, 3063 (long) rel->r_offset, name, (int) r); 3064 return FALSE; 3065 } 3066 } 3067 } 3068 3069 return TRUE; 3070} 3071 3072/* Finish up dynamic symbol handling. We set the contents of various 3073 dynamic sections here. */ 3074 3075static bfd_boolean 3076elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym) 3077 bfd *output_bfd; 3078 struct bfd_link_info *info; 3079 struct elf_link_hash_entry *h; 3080 Elf_Internal_Sym *sym; 3081{ 3082 struct elf_s390_link_hash_table *htab; 3083 3084 htab = elf_s390_hash_table (info); 3085 3086 if (h->plt.offset != (bfd_vma) -1) 3087 { 3088 bfd_vma plt_index; 3089 bfd_vma got_offset; 3090 Elf_Internal_Rela rela; 3091 bfd_byte *loc; 3092 3093 /* This symbol has an entry in the procedure linkage table. Set 3094 it up. */ 3095 3096 if (h->dynindx == -1 3097 || htab->splt == NULL 3098 || htab->sgotplt == NULL 3099 || htab->srelplt == NULL) 3100 abort (); 3101 3102 /* Calc. index no. 3103 Current offset - size first entry / entry size. */ 3104 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3105 3106 /* Offset in GOT is PLT index plus GOT headers(3) times 8, 3107 addr & GOT addr. */ 3108 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3109 3110 /* Fill in the blueprint of a PLT. */ 3111 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0, 3112 htab->splt->contents + h->plt.offset); 3113 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1, 3114 htab->splt->contents + h->plt.offset + 4); 3115 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2, 3116 htab->splt->contents + h->plt.offset + 8); 3117 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3, 3118 htab->splt->contents + h->plt.offset + 12); 3119 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4, 3120 htab->splt->contents + h->plt.offset + 16); 3121 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5, 3122 htab->splt->contents + h->plt.offset + 20); 3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6, 3124 htab->splt->contents + h->plt.offset + 24); 3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7, 3126 htab->splt->contents + h->plt.offset + 28); 3127 /* Fixup the relative address to the GOT entry */ 3128 bfd_put_32 (output_bfd, 3129 (htab->sgotplt->output_section->vma + 3130 htab->sgotplt->output_offset + got_offset 3131 - (htab->splt->output_section->vma + h->plt.offset))/2, 3132 htab->splt->contents + h->plt.offset + 2); 3133 /* Fixup the relative branch to PLT 0 */ 3134 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + 3135 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3136 htab->splt->contents + h->plt.offset + 24); 3137 /* Fixup offset into symbol table */ 3138 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), 3139 htab->splt->contents + h->plt.offset + 28); 3140 3141 /* Fill in the entry in the global offset table. 3142 Points to instruction after GOT offset. */ 3143 bfd_put_64 (output_bfd, 3144 (htab->splt->output_section->vma 3145 + htab->splt->output_offset 3146 + h->plt.offset 3147 + 14), 3148 htab->sgotplt->contents + got_offset); 3149 3150 /* Fill in the entry in the .rela.plt section. */ 3151 rela.r_offset = (htab->sgotplt->output_section->vma 3152 + htab->sgotplt->output_offset 3153 + got_offset); 3154 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3155 rela.r_addend = 0; 3156 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); 3157 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3158 3159 if (!h->def_regular) 3160 { 3161 /* Mark the symbol as undefined, rather than as defined in 3162 the .plt section. Leave the value alone. This is a clue 3163 for the dynamic linker, to make function pointer 3164 comparisons work between an application and shared 3165 library. */ 3166 sym->st_shndx = SHN_UNDEF; 3167 } 3168 } 3169 3170 if (h->got.offset != (bfd_vma) -1 3171 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3172 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3173 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3174 { 3175 Elf_Internal_Rela rela; 3176 bfd_byte *loc; 3177 3178 /* This symbol has an entry in the global offset table. Set it 3179 up. */ 3180 if (htab->sgot == NULL || htab->srelgot == NULL) 3181 abort (); 3182 3183 rela.r_offset = (htab->sgot->output_section->vma 3184 + htab->sgot->output_offset 3185 + (h->got.offset &~ (bfd_vma) 1)); 3186 3187 /* If this is a static link, or it is a -Bsymbolic link and the 3188 symbol is defined locally or was forced to be local because 3189 of a version file, we just want to emit a RELATIVE reloc. 3190 The entry in the global offset table will already have been 3191 initialized in the relocate_section function. */ 3192 if (info->shared 3193 && (info->symbolic 3194 || h->dynindx == -1 3195 || h->forced_local) 3196 && h->def_regular) 3197 { 3198 BFD_ASSERT((h->got.offset & 1) != 0); 3199 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 3200 rela.r_addend = (h->root.u.def.value 3201 + h->root.u.def.section->output_section->vma 3202 + h->root.u.def.section->output_offset); 3203 } 3204 else 3205 { 3206 BFD_ASSERT((h->got.offset & 1) == 0); 3207 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset); 3208 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); 3209 rela.r_addend = 0; 3210 } 3211 3212 loc = htab->srelgot->contents; 3213 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3214 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3215 } 3216 3217 if (h->needs_copy) 3218 { 3219 Elf_Internal_Rela rela; 3220 bfd_byte *loc; 3221 3222 /* This symbols needs a copy reloc. Set it up. */ 3223 3224 if (h->dynindx == -1 3225 || (h->root.type != bfd_link_hash_defined 3226 && h->root.type != bfd_link_hash_defweak) 3227 || htab->srelbss == NULL) 3228 abort (); 3229 3230 rela.r_offset = (h->root.u.def.value 3231 + h->root.u.def.section->output_section->vma 3232 + h->root.u.def.section->output_offset); 3233 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); 3234 rela.r_addend = 0; 3235 loc = htab->srelbss->contents; 3236 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); 3237 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3238 } 3239 3240 /* Mark some specially defined symbols as absolute. */ 3241 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3242 || h == htab->elf.hgot 3243 || h == htab->elf.hplt) 3244 sym->st_shndx = SHN_ABS; 3245 3246 return TRUE; 3247} 3248 3249/* Used to decide how to sort relocs in an optimal manner for the 3250 dynamic linker, before writing them out. */ 3251 3252static enum elf_reloc_type_class 3253elf_s390_reloc_type_class (rela) 3254 const Elf_Internal_Rela *rela; 3255{ 3256 switch ((int) ELF64_R_TYPE (rela->r_info)) 3257 { 3258 case R_390_RELATIVE: 3259 return reloc_class_relative; 3260 case R_390_JMP_SLOT: 3261 return reloc_class_plt; 3262 case R_390_COPY: 3263 return reloc_class_copy; 3264 default: 3265 return reloc_class_normal; 3266 } 3267} 3268 3269/* Finish up the dynamic sections. */ 3270 3271static bfd_boolean 3272elf_s390_finish_dynamic_sections (output_bfd, info) 3273 bfd *output_bfd; 3274 struct bfd_link_info *info; 3275{ 3276 struct elf_s390_link_hash_table *htab; 3277 bfd *dynobj; 3278 asection *sdyn; 3279 3280 htab = elf_s390_hash_table (info); 3281 dynobj = htab->elf.dynobj; 3282 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3283 3284 if (htab->elf.dynamic_sections_created) 3285 { 3286 Elf64_External_Dyn *dyncon, *dynconend; 3287 3288 if (sdyn == NULL || htab->sgot == NULL) 3289 abort (); 3290 3291 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3292 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 3293 for (; dyncon < dynconend; dyncon++) 3294 { 3295 Elf_Internal_Dyn dyn; 3296 asection *s; 3297 3298 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3299 3300 switch (dyn.d_tag) 3301 { 3302 default: 3303 continue; 3304 3305 case DT_PLTGOT: 3306 dyn.d_un.d_ptr = htab->sgot->output_section->vma; 3307 break; 3308 3309 case DT_JMPREL: 3310 dyn.d_un.d_ptr = htab->srelplt->output_section->vma; 3311 break; 3312 3313 case DT_PLTRELSZ: 3314 s = htab->srelplt->output_section; 3315 dyn.d_un.d_val = s->size; 3316 break; 3317 3318 case DT_RELASZ: 3319 /* The procedure linkage table relocs (DT_JMPREL) should 3320 not be included in the overall relocs (DT_RELA). 3321 Therefore, we override the DT_RELASZ entry here to 3322 make it not include the JMPREL relocs. Since the 3323 linker script arranges for .rela.plt to follow all 3324 other relocation sections, we don't have to worry 3325 about changing the DT_RELA entry. */ 3326 s = htab->srelplt->output_section; 3327 dyn.d_un.d_val -= s->size; 3328 break; 3329 } 3330 3331 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3332 } 3333 3334 /* Fill in the special first entry in the procedure linkage table. */ 3335 if (htab->splt && htab->splt->size > 0) 3336 { 3337 /* fill in blueprint for plt 0 entry */ 3338 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0, 3339 htab->splt->contents ); 3340 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1, 3341 htab->splt->contents +4 ); 3342 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3, 3343 htab->splt->contents +12 ); 3344 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4, 3345 htab->splt->contents +16 ); 3346 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5, 3347 htab->splt->contents +20 ); 3348 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6, 3349 htab->splt->contents + 24); 3350 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7, 3351 htab->splt->contents + 28 ); 3352 /* Fixup relative address to start of GOT */ 3353 bfd_put_32 (output_bfd, 3354 (htab->sgotplt->output_section->vma + 3355 htab->sgotplt->output_offset 3356 - htab->splt->output_section->vma - 6)/2, 3357 htab->splt->contents + 8); 3358 } 3359 elf_section_data (htab->splt->output_section) 3360 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; 3361 } 3362 3363 if (htab->sgotplt) 3364 { 3365 /* Fill in the first three entries in the global offset table. */ 3366 if (htab->sgotplt->size > 0) 3367 { 3368 bfd_put_64 (output_bfd, 3369 (sdyn == NULL ? (bfd_vma) 0 3370 : sdyn->output_section->vma + sdyn->output_offset), 3371 htab->sgotplt->contents); 3372 /* One entry for shared object struct ptr. */ 3373 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); 3374 /* One entry for _dl_runtime_resolve. */ 3375 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12); 3376 } 3377 3378 elf_section_data (htab->sgot->output_section) 3379 ->this_hdr.sh_entsize = 8; 3380 } 3381 return TRUE; 3382} 3383 3384/* Return address for Ith PLT stub in section PLT, for relocation REL 3385 or (bfd_vma) -1 if it should not be included. */ 3386 3387static bfd_vma 3388elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3389 const arelent *rel ATTRIBUTE_UNUSED) 3390{ 3391 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3392} 3393 3394 3395/* Why was the hash table entry size definition changed from 3396 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and 3397 this is the only reason for the s390_elf64_size_info structure. */ 3398 3399const struct elf_size_info s390_elf64_size_info = 3400{ 3401 sizeof (Elf64_External_Ehdr), 3402 sizeof (Elf64_External_Phdr), 3403 sizeof (Elf64_External_Shdr), 3404 sizeof (Elf64_External_Rel), 3405 sizeof (Elf64_External_Rela), 3406 sizeof (Elf64_External_Sym), 3407 sizeof (Elf64_External_Dyn), 3408 sizeof (Elf_External_Note), 3409 8, /* hash-table entry size. */ 3410 1, /* internal relocations per external relocations. */ 3411 64, /* arch_size. */ 3412 3, /* log_file_align. */ 3413 ELFCLASS64, EV_CURRENT, 3414 bfd_elf64_write_out_phdrs, 3415 bfd_elf64_write_shdrs_and_ehdr, 3416 bfd_elf64_write_relocs, 3417 bfd_elf64_swap_symbol_in, 3418 bfd_elf64_swap_symbol_out, 3419 bfd_elf64_slurp_reloc_table, 3420 bfd_elf64_slurp_symbol_table, 3421 bfd_elf64_swap_dyn_in, 3422 bfd_elf64_swap_dyn_out, 3423 bfd_elf64_swap_reloc_in, 3424 bfd_elf64_swap_reloc_out, 3425 bfd_elf64_swap_reloca_in, 3426 bfd_elf64_swap_reloca_out 3427}; 3428 3429#define TARGET_BIG_SYM bfd_elf64_s390_vec 3430#define TARGET_BIG_NAME "elf64-s390" 3431#define ELF_ARCH bfd_arch_s390 3432#define ELF_MACHINE_CODE EM_S390 3433#define ELF_MACHINE_ALT1 EM_S390_OLD 3434#define ELF_MAXPAGESIZE 0x1000 3435 3436#define elf_backend_size_info s390_elf64_size_info 3437 3438#define elf_backend_can_gc_sections 1 3439#define elf_backend_can_refcount 1 3440#define elf_backend_want_got_plt 1 3441#define elf_backend_plt_readonly 1 3442#define elf_backend_want_plt_sym 0 3443#define elf_backend_got_header_size 24 3444#define elf_backend_rela_normal 1 3445 3446#define elf_info_to_howto elf_s390_info_to_howto 3447 3448#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name 3449#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create 3450#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3451#define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 3452 3453#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3454#define elf_backend_check_relocs elf_s390_check_relocs 3455#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3456#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 3457#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3458#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3459#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3460#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 3461#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3462#define elf_backend_relocate_section elf_s390_relocate_section 3463#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 3464#define elf_backend_init_index_section _bfd_elf_init_1_index_section 3465#define elf_backend_reloc_type_class elf_s390_reloc_type_class 3466#define elf_backend_plt_sym_val elf_s390_plt_sym_val 3467 3468#define bfd_elf64_mkobject elf_s390_mkobject 3469#define elf_backend_object_p elf_s390_object_p 3470 3471#include "elf64-target.h" 3472