1 /* IBM S/390-specific support for 32-bit ELF 2 Copyright (C) 2000-2014 Free Software Foundation, Inc. 3 Contributed by Carl B. Pedersen and Martin Schwidefsky. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 20 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "bfdlink.h" 25 #include "libbfd.h" 26 #include "elf-bfd.h" 27 #include "elf/s390.h" 28 29 static bfd_reloc_status_type 30 s390_tls_reloc (bfd *, arelent *, asymbol *, void *, 31 asection *, bfd *, char **); 32 static bfd_reloc_status_type 33 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *, 34 asection *, bfd *, char **); 35 36 /* The relocation "howto" table. */ 37 38 static reloc_howto_type elf_howto_table[] = 39 { 40 HOWTO (R_390_NONE, /* type */ 41 0, /* rightshift */ 42 0, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */ 43 0, /* bitsize */ 44 FALSE, /* pc_relative */ 45 0, /* bitpos */ 46 complain_overflow_dont, /* complain_on_overflow */ 47 bfd_elf_generic_reloc, /* special_function */ 48 "R_390_NONE", /* name */ 49 FALSE, /* partial_inplace */ 50 0, /* src_mask */ 51 0, /* dst_mask */ 52 FALSE), /* pcrel_offset */ 53 54 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 55 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 56 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 57 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 58 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 59 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 60 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 61 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 62 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 63 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 64 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 65 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 66 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 67 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 68 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 69 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 70 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 71 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE), 72 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 73 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE), 74 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 75 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE), 76 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 77 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE), 78 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 79 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE), 80 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 81 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE), 82 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 83 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 84 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 85 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 86 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 87 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 88 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 89 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 90 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 91 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 92 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 93 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 94 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 95 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE), 96 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */ 97 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */ 98 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */ 99 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */ 100 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 101 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE), 102 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 103 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 104 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */ 105 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 106 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 107 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 108 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 109 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 110 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 111 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */ 112 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 113 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE), 114 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 115 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 116 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 118 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */ 119 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 120 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 121 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 122 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 123 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 124 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 125 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 126 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE), 127 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */ 128 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 129 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 130 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 131 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE), 132 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */ 133 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 134 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE), 135 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */ 136 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 137 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE), 138 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */ 139 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 140 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE), 141 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 142 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE), 143 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */ 144 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 145 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE), 146 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */ 147 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 148 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE), 149 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 150 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE), 151 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 152 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE), 153 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 154 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 155 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 156 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 157 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 158 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 159 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 160 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 161 HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 162 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE), 163 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 164 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE), 165 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 166 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE), 167 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 168 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE), 169 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 170 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE), 171 }; 172 173 /* GNU extension to record C++ vtable hierarchy. */ 174 static reloc_howto_type elf32_s390_vtinherit_howto = 175 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 176 static reloc_howto_type elf32_s390_vtentry_howto = 177 HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE); 178 179 static reloc_howto_type * 180 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 181 bfd_reloc_code_real_type code) 182 { 183 switch (code) 184 { 185 case BFD_RELOC_NONE: 186 return &elf_howto_table[(int) R_390_NONE]; 187 case BFD_RELOC_8: 188 return &elf_howto_table[(int) R_390_8]; 189 case BFD_RELOC_390_12: 190 return &elf_howto_table[(int) R_390_12]; 191 case BFD_RELOC_16: 192 return &elf_howto_table[(int) R_390_16]; 193 case BFD_RELOC_32: 194 return &elf_howto_table[(int) R_390_32]; 195 case BFD_RELOC_CTOR: 196 return &elf_howto_table[(int) R_390_32]; 197 case BFD_RELOC_32_PCREL: 198 return &elf_howto_table[(int) R_390_PC32]; 199 case BFD_RELOC_390_GOT12: 200 return &elf_howto_table[(int) R_390_GOT12]; 201 case BFD_RELOC_32_GOT_PCREL: 202 return &elf_howto_table[(int) R_390_GOT32]; 203 case BFD_RELOC_390_PLT32: 204 return &elf_howto_table[(int) R_390_PLT32]; 205 case BFD_RELOC_390_COPY: 206 return &elf_howto_table[(int) R_390_COPY]; 207 case BFD_RELOC_390_GLOB_DAT: 208 return &elf_howto_table[(int) R_390_GLOB_DAT]; 209 case BFD_RELOC_390_JMP_SLOT: 210 return &elf_howto_table[(int) R_390_JMP_SLOT]; 211 case BFD_RELOC_390_RELATIVE: 212 return &elf_howto_table[(int) R_390_RELATIVE]; 213 case BFD_RELOC_32_GOTOFF: 214 return &elf_howto_table[(int) R_390_GOTOFF32]; 215 case BFD_RELOC_390_GOTPC: 216 return &elf_howto_table[(int) R_390_GOTPC]; 217 case BFD_RELOC_390_GOT16: 218 return &elf_howto_table[(int) R_390_GOT16]; 219 case BFD_RELOC_16_PCREL: 220 return &elf_howto_table[(int) R_390_PC16]; 221 case BFD_RELOC_390_PC12DBL: 222 return &elf_howto_table[(int) R_390_PC12DBL]; 223 case BFD_RELOC_390_PLT12DBL: 224 return &elf_howto_table[(int) R_390_PLT12DBL]; 225 case BFD_RELOC_390_PC16DBL: 226 return &elf_howto_table[(int) R_390_PC16DBL]; 227 case BFD_RELOC_390_PLT16DBL: 228 return &elf_howto_table[(int) R_390_PLT16DBL]; 229 case BFD_RELOC_390_PC24DBL: 230 return &elf_howto_table[(int) R_390_PC24DBL]; 231 case BFD_RELOC_390_PLT24DBL: 232 return &elf_howto_table[(int) R_390_PLT24DBL]; 233 case BFD_RELOC_390_PC32DBL: 234 return &elf_howto_table[(int) R_390_PC32DBL]; 235 case BFD_RELOC_390_PLT32DBL: 236 return &elf_howto_table[(int) R_390_PLT32DBL]; 237 case BFD_RELOC_390_GOTPCDBL: 238 return &elf_howto_table[(int) R_390_GOTPCDBL]; 239 case BFD_RELOC_390_GOTENT: 240 return &elf_howto_table[(int) R_390_GOTENT]; 241 case BFD_RELOC_16_GOTOFF: 242 return &elf_howto_table[(int) R_390_GOTOFF16]; 243 case BFD_RELOC_390_GOTPLT12: 244 return &elf_howto_table[(int) R_390_GOTPLT12]; 245 case BFD_RELOC_390_GOTPLT16: 246 return &elf_howto_table[(int) R_390_GOTPLT16]; 247 case BFD_RELOC_390_GOTPLT32: 248 return &elf_howto_table[(int) R_390_GOTPLT32]; 249 case BFD_RELOC_390_GOTPLTENT: 250 return &elf_howto_table[(int) R_390_GOTPLTENT]; 251 case BFD_RELOC_390_PLTOFF16: 252 return &elf_howto_table[(int) R_390_PLTOFF16]; 253 case BFD_RELOC_390_PLTOFF32: 254 return &elf_howto_table[(int) R_390_PLTOFF32]; 255 case BFD_RELOC_390_TLS_LOAD: 256 return &elf_howto_table[(int) R_390_TLS_LOAD]; 257 case BFD_RELOC_390_TLS_GDCALL: 258 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 259 case BFD_RELOC_390_TLS_LDCALL: 260 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 261 case BFD_RELOC_390_TLS_GD32: 262 return &elf_howto_table[(int) R_390_TLS_GD32]; 263 case BFD_RELOC_390_TLS_GOTIE12: 264 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 265 case BFD_RELOC_390_TLS_GOTIE32: 266 return &elf_howto_table[(int) R_390_TLS_GOTIE32]; 267 case BFD_RELOC_390_TLS_LDM32: 268 return &elf_howto_table[(int) R_390_TLS_LDM32]; 269 case BFD_RELOC_390_TLS_IE32: 270 return &elf_howto_table[(int) R_390_TLS_IE32]; 271 case BFD_RELOC_390_TLS_IEENT: 272 return &elf_howto_table[(int) R_390_TLS_IEENT]; 273 case BFD_RELOC_390_TLS_LE32: 274 return &elf_howto_table[(int) R_390_TLS_LE32]; 275 case BFD_RELOC_390_TLS_LDO32: 276 return &elf_howto_table[(int) R_390_TLS_LDO32]; 277 case BFD_RELOC_390_TLS_DTPMOD: 278 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 279 case BFD_RELOC_390_TLS_DTPOFF: 280 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 281 case BFD_RELOC_390_TLS_TPOFF: 282 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 283 case BFD_RELOC_390_20: 284 return &elf_howto_table[(int) R_390_20]; 285 case BFD_RELOC_390_GOT20: 286 return &elf_howto_table[(int) R_390_GOT20]; 287 case BFD_RELOC_390_GOTPLT20: 288 return &elf_howto_table[(int) R_390_GOTPLT20]; 289 case BFD_RELOC_390_TLS_GOTIE20: 290 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 291 case BFD_RELOC_390_IRELATIVE: 292 return &elf_howto_table[(int) R_390_IRELATIVE]; 293 case BFD_RELOC_VTABLE_INHERIT: 294 return &elf32_s390_vtinherit_howto; 295 case BFD_RELOC_VTABLE_ENTRY: 296 return &elf32_s390_vtentry_howto; 297 default: 298 break; 299 } 300 return 0; 301 } 302 303 static reloc_howto_type * 304 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 305 const char *r_name) 306 { 307 unsigned int i; 308 309 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 310 if (elf_howto_table[i].name != NULL 311 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 312 return &elf_howto_table[i]; 313 314 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0) 315 return &elf32_s390_vtinherit_howto; 316 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0) 317 return &elf32_s390_vtentry_howto; 318 319 return NULL; 320 } 321 322 /* We need to use ELF32_R_TYPE so we have our own copy of this function, 323 and elf32-s390.c has its own copy. */ 324 325 static void 326 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 327 arelent *cache_ptr, 328 Elf_Internal_Rela *dst) 329 { 330 unsigned int r_type = ELF32_R_TYPE(dst->r_info); 331 switch (r_type) 332 { 333 case R_390_GNU_VTINHERIT: 334 cache_ptr->howto = &elf32_s390_vtinherit_howto; 335 break; 336 337 case R_390_GNU_VTENTRY: 338 cache_ptr->howto = &elf32_s390_vtentry_howto; 339 break; 340 341 default: 342 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 343 { 344 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 345 abfd, (int) r_type); 346 r_type = R_390_NONE; 347 } 348 cache_ptr->howto = &elf_howto_table[r_type]; 349 } 350 } 351 352 /* A relocation function which doesn't do anything. */ 353 static bfd_reloc_status_type 354 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED, 355 arelent *reloc_entry, 356 asymbol *symbol ATTRIBUTE_UNUSED, 357 void * data ATTRIBUTE_UNUSED, 358 asection *input_section, 359 bfd *output_bfd, 360 char **error_message ATTRIBUTE_UNUSED) 361 { 362 if (output_bfd) 363 reloc_entry->address += input_section->output_offset; 364 return bfd_reloc_ok; 365 } 366 367 /* Handle the large displacement relocs. */ 368 static bfd_reloc_status_type 369 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED, 370 arelent *reloc_entry, 371 asymbol *symbol, 372 void * data ATTRIBUTE_UNUSED, 373 asection *input_section, 374 bfd *output_bfd, 375 char **error_message ATTRIBUTE_UNUSED) 376 { 377 reloc_howto_type *howto = reloc_entry->howto; 378 bfd_vma relocation; 379 bfd_vma insn; 380 381 if (output_bfd != (bfd *) NULL 382 && (symbol->flags & BSF_SECTION_SYM) == 0 383 && (! howto->partial_inplace 384 || reloc_entry->addend == 0)) 385 { 386 reloc_entry->address += input_section->output_offset; 387 return bfd_reloc_ok; 388 } 389 390 if (output_bfd != NULL) 391 return bfd_reloc_continue; 392 393 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 394 return bfd_reloc_outofrange; 395 396 relocation = (symbol->value 397 + symbol->section->output_section->vma 398 + symbol->section->output_offset); 399 relocation += reloc_entry->addend; 400 if (howto->pc_relative) 401 { 402 relocation -= (input_section->output_section->vma 403 + input_section->output_offset); 404 relocation -= reloc_entry->address; 405 } 406 407 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 408 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 409 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 410 411 if ((bfd_signed_vma) relocation < - 0x80000 412 || (bfd_signed_vma) relocation > 0x7ffff) 413 return bfd_reloc_overflow; 414 else 415 return bfd_reloc_ok; 416 } 417 418 static bfd_boolean 419 elf_s390_is_local_label_name (bfd *abfd, const char *name) 420 { 421 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 422 return TRUE; 423 424 return _bfd_elf_is_local_label_name (abfd, name); 425 } 426 427 /* Functions for the 390 ELF linker. */ 428 429 /* The name of the dynamic interpreter. This is put in the .interp 430 section. */ 431 432 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 433 434 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 435 copying dynamic variables from a shared lib into an app's dynbss 436 section, and instead use a dynamic relocation to point into the 437 shared lib. */ 438 #define ELIMINATE_COPY_RELOCS 1 439 440 /* The size in bytes of the first entry in the procedure linkage table. */ 441 #define PLT_FIRST_ENTRY_SIZE 32 442 /* The size in bytes of an entry in the procedure linkage table. */ 443 #define PLT_ENTRY_SIZE 32 444 445 #define GOT_ENTRY_SIZE 4 446 447 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela) 448 449 /* The first three entries in a procedure linkage table are reserved, 450 and the initial contents are unimportant (we zero them out). 451 Subsequent entries look like this. See the SVR4 ABI 386 452 supplement to see how this works. */ 453 454 /* For the s390, simple addr offset can only be 0 - 4096. 455 To use the full 2 GB address space, several instructions 456 are needed to load an address in a register and execute 457 a branch( or just saving the address) 458 459 Furthermore, only r 0 and 1 are free to use!!! */ 460 461 /* The first 3 words in the GOT are then reserved. 462 Word 0 is the address of the dynamic table. 463 Word 1 is a pointer to a structure describing the object 464 Word 2 is used to point to the loader entry address. 465 466 The code for position independent PLT entries looks like this: 467 468 r12 holds addr of the current GOT at entry to the PLT 469 470 The GOT holds the address in the PLT to be executed. 471 The loader then gets: 472 24(15) = Pointer to the structure describing the object. 473 28(15) = Offset into rela.plt 474 475 The loader must then find the module where the function is 476 and insert the address in the GOT. 477 478 Note: 390 can only address +- 64 K relative. 479 We check if offset > 65536, then make a relative branch -64xxx 480 back to a previous defined branch 481 482 PLT1: BASR 1,0 # 2 bytes 483 L 1,22(1) # 4 bytes Load offset in GOT in r 1 484 L 1,(1,12) # 4 bytes Load address from GOT in r1 485 BCR 15,1 # 2 bytes Jump to address 486 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 487 L 1,14(1) # 4 bytes Load offset in symol table in r1 488 BRC 15,-x # 4 bytes Jump to start of PLT 489 .word 0 # 2 bytes filler 490 .long ? # 4 bytes offset in GOT 491 .long ? # 4 bytes offset into rela.plt 492 493 This was the general case. There are two additional, optimizes PLT 494 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768. 495 First the one for GOT offsets < 4096: 496 497 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1 498 BCR 15,1 # 2 bytes Jump to address 499 .word 0,0,0 # 6 bytes filler 500 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 501 L 1,14(1) # 4 bytes Load offset in rela.plt in r1 502 BRC 15,-x # 4 bytes Jump to start of PLT 503 .word 0,0,0 # 6 bytes filler 504 .long ? # 4 bytes offset into rela.plt 505 506 Second the one for GOT offsets < 32768: 507 508 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1 509 L 1,(1,12) # 4 bytes Load address from GOT to r1 510 BCR 15,1 # 2 bytes Jump to address 511 .word 0 # 2 bytes filler 512 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 513 L 1,14(1) # 4 bytes Load offset in rela.plt in r1 514 BRC 15,-x # 4 bytes Jump to start of PLT 515 .word 0,0,0 # 6 bytes filler 516 .long ? # 4 bytes offset into rela.plt 517 518 Total = 32 bytes per PLT entry 519 520 The code for static build PLT entries looks like this: 521 522 PLT1: BASR 1,0 # 2 bytes 523 L 1,22(1) # 4 bytes Load address of GOT entry 524 L 1,0(0,1) # 4 bytes Load address from GOT in r1 525 BCR 15,1 # 2 bytes Jump to address 526 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 527 L 1,14(1) # 4 bytes Load offset in symbol table in r1 528 BRC 15,-x # 4 bytes Jump to start of PLT 529 .word 0 # 2 bytes filler 530 .long ? # 4 bytes address of GOT entry 531 .long ? # 4 bytes offset into rela.plt */ 532 533 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] = 534 { 535 0x0d, 0x10, /* basr %r1,%r0 */ 536 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */ 537 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */ 538 0x07, 0xf1, /* br %r1 */ 539 0x0d, 0x10, /* basr %r1,%r0 */ 540 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 541 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 542 0x00, 0x00, /* padding */ 543 0x00, 0x00, 0x00, 0x00, /* GOT offset */ 544 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */ 545 }; 546 547 /* Generic PLT pic entry. */ 548 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] = 549 { 550 0x0d, 0x10, /* basr %r1,%r0 */ 551 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */ 552 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */ 553 0x07, 0xf1, /* br %r1 */ 554 0x0d, 0x10, /* basr %r1,%r0 */ 555 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 556 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 557 0x00, 0x00, /* padding */ 558 0x00, 0x00, 0x00, 0x00, /* GOT offset */ 559 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */ 560 }; 561 562 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced 563 when generating the PLT slot with the GOT offset. */ 564 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] = 565 { 566 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */ 567 0x07, 0xf1, /* br %r1 */ 568 0x00, 0x00, 0x00, 0x00, /* padding */ 569 0x00, 0x00, 570 0x0d, 0x10, /* basr %r1,%r0 */ 571 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 572 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 573 0x00, 0x00, 0x00, 0x00, 574 0x00, 0x00, 0x00, 0x00 575 }; 576 577 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced 578 when generating the PLT slot with the GOT offset. */ 579 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] = 580 { 581 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */ 582 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */ 583 0x07, 0xf1, /* br %r1 */ 584 0x00, 0x00, 585 0x0d, 0x10, /* basr %r1,%r0 */ 586 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 587 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 588 0x00, 0x00, 0x00, 0x00, 589 0x00, 0x00, 0x00, 0x00, 590 0x00, 0x00 591 }; 592 593 /* The first PLT entry pushes the offset into the rela.plt 594 from R1 onto the stack at 8(15) and the loader object info 595 at 12(15), loads the loader address in R1 and jumps to it. */ 596 597 /* The first entry in the PLT for PIC code: 598 599 PLT0: 600 ST 1,28(15) # R1 has offset into rela.plt 601 L 1,4(12) # Get loader ino(object struct address) 602 ST 1,24(15) # Store address 603 L 1,8(12) # Entry address of loader in R1 604 BR 1 # Jump to loader 605 606 The first entry in the PLT for static code: 607 608 PLT0: 609 ST 1,28(15) # R1 has offset into rela.plt 610 BASR 1,0 611 L 1,18(0,1) # Get address of GOT 612 MVC 24(4,15),4(1) # Move loader ino to stack 613 L 1,8(1) # Get address of loader 614 BR 1 # Jump to loader 615 .word 0 # filler 616 .long got # address of GOT */ 617 618 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] = 619 { 620 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */ 621 0x0d, 0x10, /* basr %r1,%r0 */ 622 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */ 623 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */ 624 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */ 625 0x07, 0xf1, /* br %r1 */ 626 0x00, 0x00, 0x00, 0x00, 627 0x00, 0x00, 0x00, 0x00, 628 0x00, 0x00 629 }; 630 631 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] = 632 { 633 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */ 634 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */ 635 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */ 636 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */ 637 0x07, 0xf1, /* br %r1 */ 638 0x00, 0x00, 0x00, 0x00, 639 0x00, 0x00, 0x00, 0x00, 640 0x00, 0x00, 0x00, 0x00, 641 0x00, 0x00 642 }; 643 644 645 /* s390 ELF linker hash entry. */ 646 647 struct elf_s390_link_hash_entry 648 { 649 struct elf_link_hash_entry elf; 650 651 /* Track dynamic relocs copied for this symbol. */ 652 struct elf_dyn_relocs *dyn_relocs; 653 654 /* Number of GOTPLT references for a function. */ 655 bfd_signed_vma gotplt_refcount; 656 657 #define GOT_UNKNOWN 0 658 #define GOT_NORMAL 1 659 #define GOT_TLS_GD 2 660 #define GOT_TLS_IE 3 661 #define GOT_TLS_IE_NLT 4 662 unsigned char tls_type; 663 664 /* For pointer equality reasons we might need to change the symbol 665 type from STT_GNU_IFUNC to STT_FUNC together with its value and 666 section entry. So after alloc_dynrelocs only these values should 667 be used. In order to check whether a symbol is IFUNC use 668 s390_is_ifunc_symbol_p. */ 669 bfd_vma ifunc_resolver_address; 670 asection *ifunc_resolver_section; 671 }; 672 673 #define elf_s390_hash_entry(ent) \ 674 ((struct elf_s390_link_hash_entry *)(ent)) 675 676 /* This structure represents an entry in the local PLT list needed for 677 local IFUNC symbols. */ 678 struct plt_entry 679 { 680 /* The section of the local symbol. 681 Set in relocate_section and used in finish_dynamic_sections. */ 682 asection *sec; 683 684 union 685 { 686 bfd_signed_vma refcount; 687 bfd_vma offset; 688 } plt; 689 }; 690 691 /* NOTE: Keep this structure in sync with 692 the one declared in elf64-s390.c. */ 693 struct elf_s390_obj_tdata 694 { 695 struct elf_obj_tdata root; 696 697 /* A local PLT is needed for ifunc symbols. */ 698 struct plt_entry *local_plt; 699 700 /* TLS type for each local got entry. */ 701 char *local_got_tls_type; 702 }; 703 704 #define elf_s390_tdata(abfd) \ 705 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 706 707 #define elf_s390_local_plt(abfd) \ 708 (elf_s390_tdata (abfd)->local_plt) 709 710 #define elf_s390_local_got_tls_type(abfd) \ 711 (elf_s390_tdata (abfd)->local_got_tls_type) 712 713 #define is_s390_elf(bfd) \ 714 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 715 && elf_tdata (bfd) != NULL \ 716 && elf_object_id (bfd) == S390_ELF_DATA) 717 718 static bfd_boolean 719 elf_s390_mkobject (bfd *abfd) 720 { 721 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata), 722 S390_ELF_DATA); 723 } 724 725 static bfd_boolean 726 elf_s390_object_p (bfd *abfd) 727 { 728 /* Set the right machine number for an s390 elf32 file. */ 729 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31); 730 } 731 732 /* s390 ELF linker hash table. */ 733 734 struct elf_s390_link_hash_table 735 { 736 struct elf_link_hash_table elf; 737 738 /* Short-cuts to get to dynamic linker sections. */ 739 asection *sdynbss; 740 asection *srelbss; 741 asection *irelifunc; 742 743 union 744 { 745 bfd_signed_vma refcount; 746 bfd_vma offset; 747 } tls_ldm_got; 748 749 /* Small local sym cache. */ 750 struct sym_cache sym_cache; 751 }; 752 753 /* Get the s390 ELF linker hash table from a link_info structure. */ 754 755 #define elf_s390_hash_table(p) \ 756 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 757 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL) 758 759 #undef ELF64 760 #include "elf-s390-common.c" 761 762 /* Create an entry in an s390 ELF linker hash table. */ 763 764 static struct bfd_hash_entry * 765 link_hash_newfunc (struct bfd_hash_entry *entry, 766 struct bfd_hash_table *table, 767 const char *string) 768 { 769 /* Allocate the structure if it has not already been allocated by a 770 subclass. */ 771 if (entry == NULL) 772 { 773 entry = bfd_hash_allocate (table, 774 sizeof (struct elf_s390_link_hash_entry)); 775 if (entry == NULL) 776 return entry; 777 } 778 779 /* Call the allocation method of the superclass. */ 780 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 781 if (entry != NULL) 782 { 783 struct elf_s390_link_hash_entry *eh; 784 785 eh = (struct elf_s390_link_hash_entry *) entry; 786 eh->dyn_relocs = NULL; 787 eh->gotplt_refcount = 0; 788 eh->tls_type = GOT_UNKNOWN; 789 eh->ifunc_resolver_address = 0; 790 eh->ifunc_resolver_section = NULL; 791 } 792 793 return entry; 794 } 795 796 /* Create an s390 ELF linker hash table. */ 797 798 static struct bfd_link_hash_table * 799 elf_s390_link_hash_table_create (bfd *abfd) 800 { 801 struct elf_s390_link_hash_table *ret; 802 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 803 804 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt); 805 if (ret == NULL) 806 return NULL; 807 808 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 809 sizeof (struct elf_s390_link_hash_entry), 810 S390_ELF_DATA)) 811 { 812 free (ret); 813 return NULL; 814 } 815 816 return &ret->elf.root; 817 } 818 819 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 820 shortcuts to them in our hash table. */ 821 822 static bfd_boolean 823 create_got_section (bfd *dynobj, struct bfd_link_info *info) 824 { 825 struct elf_s390_link_hash_table *htab; 826 827 if (! _bfd_elf_create_got_section (dynobj, info)) 828 return FALSE; 829 830 htab = elf_s390_hash_table (info); 831 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got"); 832 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); 833 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 834 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot) 835 abort (); 836 837 return TRUE; 838 } 839 840 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 841 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 842 hash table. */ 843 844 static bfd_boolean 845 elf_s390_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 846 { 847 struct elf_s390_link_hash_table *htab; 848 849 htab = elf_s390_hash_table (info); 850 if (!htab->elf.sgot && !create_got_section (dynobj, info)) 851 return FALSE; 852 853 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 854 return FALSE; 855 856 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt"); 857 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt"); 858 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); 859 if (!info->shared) 860 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); 861 862 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss 863 || (!info->shared && !htab->srelbss)) 864 abort (); 865 866 return TRUE; 867 } 868 869 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 870 871 static void 872 elf_s390_copy_indirect_symbol (struct bfd_link_info *info, 873 struct elf_link_hash_entry *dir, 874 struct elf_link_hash_entry *ind) 875 { 876 struct elf_s390_link_hash_entry *edir, *eind; 877 878 edir = (struct elf_s390_link_hash_entry *) dir; 879 eind = (struct elf_s390_link_hash_entry *) ind; 880 881 if (eind->dyn_relocs != NULL) 882 { 883 if (edir->dyn_relocs != NULL) 884 { 885 struct elf_dyn_relocs **pp; 886 struct elf_dyn_relocs *p; 887 888 /* Add reloc counts against the indirect sym to the direct sym 889 list. Merge any entries against the same section. */ 890 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 891 { 892 struct elf_dyn_relocs *q; 893 894 for (q = edir->dyn_relocs; q != NULL; q = q->next) 895 if (q->sec == p->sec) 896 { 897 q->pc_count += p->pc_count; 898 q->count += p->count; 899 *pp = p->next; 900 break; 901 } 902 if (q == NULL) 903 pp = &p->next; 904 } 905 *pp = edir->dyn_relocs; 906 } 907 908 edir->dyn_relocs = eind->dyn_relocs; 909 eind->dyn_relocs = NULL; 910 } 911 912 if (ind->root.type == bfd_link_hash_indirect 913 && dir->got.refcount <= 0) 914 { 915 edir->tls_type = eind->tls_type; 916 eind->tls_type = GOT_UNKNOWN; 917 } 918 919 if (ELIMINATE_COPY_RELOCS 920 && ind->root.type != bfd_link_hash_indirect 921 && dir->dynamic_adjusted) 922 { 923 /* If called to transfer flags for a weakdef during processing 924 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 925 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 926 dir->ref_dynamic |= ind->ref_dynamic; 927 dir->ref_regular |= ind->ref_regular; 928 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 929 dir->needs_plt |= ind->needs_plt; 930 } 931 else 932 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 933 } 934 935 static int 936 elf_s390_tls_transition (struct bfd_link_info *info, 937 int r_type, 938 int is_local) 939 { 940 if (info->shared) 941 return r_type; 942 943 switch (r_type) 944 { 945 case R_390_TLS_GD32: 946 case R_390_TLS_IE32: 947 if (is_local) 948 return R_390_TLS_LE32; 949 return R_390_TLS_IE32; 950 case R_390_TLS_GOTIE32: 951 if (is_local) 952 return R_390_TLS_LE32; 953 return R_390_TLS_GOTIE32; 954 case R_390_TLS_LDM32: 955 return R_390_TLS_LE32; 956 } 957 958 return r_type; 959 } 960 961 /* Look through the relocs for a section during the first phase, and 962 allocate space in the global offset table or procedure linkage 963 table. */ 964 965 static bfd_boolean 966 elf_s390_check_relocs (bfd *abfd, 967 struct bfd_link_info *info, 968 asection *sec, 969 const Elf_Internal_Rela *relocs) 970 { 971 struct elf_s390_link_hash_table *htab; 972 Elf_Internal_Shdr *symtab_hdr; 973 struct elf_link_hash_entry **sym_hashes; 974 const Elf_Internal_Rela *rel; 975 const Elf_Internal_Rela *rel_end; 976 asection *sreloc; 977 bfd_signed_vma *local_got_refcounts; 978 int tls_type, old_tls_type; 979 Elf_Internal_Sym *isym; 980 981 if (info->relocatable) 982 return TRUE; 983 984 BFD_ASSERT (is_s390_elf (abfd)); 985 986 htab = elf_s390_hash_table (info); 987 symtab_hdr = &elf_symtab_hdr (abfd); 988 sym_hashes = elf_sym_hashes (abfd); 989 local_got_refcounts = elf_local_got_refcounts (abfd); 990 991 sreloc = NULL; 992 993 rel_end = relocs + sec->reloc_count; 994 for (rel = relocs; rel < rel_end; rel++) 995 { 996 unsigned int r_type; 997 unsigned long r_symndx; 998 struct elf_link_hash_entry *h; 999 1000 r_symndx = ELF32_R_SYM (rel->r_info); 1001 1002 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1003 { 1004 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 1005 abfd, r_symndx); 1006 return FALSE; 1007 } 1008 1009 if (r_symndx < symtab_hdr->sh_info) 1010 { 1011 /* A local symbol. */ 1012 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1013 abfd, r_symndx); 1014 if (isym == NULL) 1015 return FALSE; 1016 1017 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1018 { 1019 struct plt_entry *plt; 1020 1021 if (htab->elf.dynobj == NULL) 1022 htab->elf.dynobj = abfd; 1023 1024 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1025 return FALSE; 1026 1027 if (local_got_refcounts == NULL) 1028 { 1029 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 1030 return FALSE; 1031 local_got_refcounts = elf_local_got_refcounts (abfd); 1032 } 1033 plt = elf_s390_local_plt (abfd); 1034 plt[r_symndx].plt.refcount++; 1035 } 1036 h = NULL; 1037 } 1038 else 1039 { 1040 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1041 while (h->root.type == bfd_link_hash_indirect 1042 || h->root.type == bfd_link_hash_warning) 1043 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1044 1045 /* PR15323, ref flags aren't set for references in the same 1046 object. */ 1047 h->root.non_ir_ref = 1; 1048 } 1049 1050 /* Create got section and local_got_refcounts array if they 1051 are needed. */ 1052 r_type = elf_s390_tls_transition (info, 1053 ELF32_R_TYPE (rel->r_info), 1054 h == NULL); 1055 switch (r_type) 1056 { 1057 case R_390_GOT12: 1058 case R_390_GOT16: 1059 case R_390_GOT20: 1060 case R_390_GOT32: 1061 case R_390_GOTENT: 1062 case R_390_GOTPLT12: 1063 case R_390_GOTPLT16: 1064 case R_390_GOTPLT20: 1065 case R_390_GOTPLT32: 1066 case R_390_GOTPLTENT: 1067 case R_390_TLS_GD32: 1068 case R_390_TLS_GOTIE12: 1069 case R_390_TLS_GOTIE20: 1070 case R_390_TLS_GOTIE32: 1071 case R_390_TLS_IEENT: 1072 case R_390_TLS_IE32: 1073 case R_390_TLS_LDM32: 1074 if (h == NULL 1075 && local_got_refcounts == NULL) 1076 { 1077 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 1078 return FALSE; 1079 local_got_refcounts = elf_local_got_refcounts (abfd); 1080 } 1081 /* Fall through. */ 1082 case R_390_GOTOFF16: 1083 case R_390_GOTOFF32: 1084 case R_390_GOTPC: 1085 case R_390_GOTPCDBL: 1086 if (htab->elf.sgot == NULL) 1087 { 1088 if (htab->elf.dynobj == NULL) 1089 htab->elf.dynobj = abfd; 1090 if (!create_got_section (htab->elf.dynobj, info)) 1091 return FALSE; 1092 } 1093 } 1094 1095 if (h != NULL) 1096 { 1097 if (htab->elf.dynobj == NULL) 1098 htab->elf.dynobj = abfd; 1099 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1100 return FALSE; 1101 1102 /* Make sure an IFUNC symbol defined in a non-shared object 1103 always gets a PLT slot. */ 1104 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1105 { 1106 /* The symbol is called by the dynamic loader in order 1107 to resolve the relocation. So it is in fact also 1108 referenced. */ 1109 h->ref_regular = 1; 1110 h->needs_plt = 1; 1111 } 1112 } 1113 switch (r_type) 1114 { 1115 case R_390_GOTOFF16: 1116 case R_390_GOTOFF32: 1117 case R_390_GOTPC: 1118 case R_390_GOTPCDBL: 1119 /* These relocs do not need a GOT slot. They just load the 1120 GOT pointer itself or address something else relative to 1121 the GOT. Since the GOT pointer has been set up above we 1122 are done. */ 1123 break; 1124 1125 case R_390_PLT12DBL: 1126 case R_390_PLT16DBL: 1127 case R_390_PLT24DBL: 1128 case R_390_PLT32DBL: 1129 case R_390_PLT32: 1130 case R_390_PLTOFF16: 1131 case R_390_PLTOFF32: 1132 /* This symbol requires a procedure linkage table entry. We 1133 actually build the entry in adjust_dynamic_symbol, 1134 because this might be a case of linking PIC code which is 1135 never referenced by a dynamic object, in which case we 1136 don't need to generate a procedure linkage table entry 1137 after all. */ 1138 1139 /* If this is a local symbol, we resolve it directly without 1140 creating a procedure linkage table entry. */ 1141 if (h != NULL) 1142 { 1143 h->needs_plt = 1; 1144 h->plt.refcount += 1; 1145 } 1146 break; 1147 1148 case R_390_GOTPLT12: 1149 case R_390_GOTPLT16: 1150 case R_390_GOTPLT20: 1151 case R_390_GOTPLT32: 1152 case R_390_GOTPLTENT: 1153 /* This symbol requires either a procedure linkage table entry 1154 or an entry in the local got. We actually build the entry 1155 in adjust_dynamic_symbol because whether this is really a 1156 global reference can change and with it the fact if we have 1157 to create a plt entry or a local got entry. To be able to 1158 make a once global symbol a local one we have to keep track 1159 of the number of gotplt references that exist for this 1160 symbol. */ 1161 if (h != NULL) 1162 { 1163 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1164 h->needs_plt = 1; 1165 h->plt.refcount += 1; 1166 } 1167 else 1168 local_got_refcounts[r_symndx] += 1; 1169 break; 1170 1171 case R_390_TLS_LDM32: 1172 htab->tls_ldm_got.refcount += 1; 1173 break; 1174 1175 case R_390_TLS_IE32: 1176 case R_390_TLS_GOTIE12: 1177 case R_390_TLS_GOTIE20: 1178 case R_390_TLS_GOTIE32: 1179 case R_390_TLS_IEENT: 1180 if (info->shared) 1181 info->flags |= DF_STATIC_TLS; 1182 /* Fall through. */ 1183 1184 case R_390_GOT12: 1185 case R_390_GOT16: 1186 case R_390_GOT20: 1187 case R_390_GOT32: 1188 case R_390_GOTENT: 1189 case R_390_TLS_GD32: 1190 /* This symbol requires a global offset table entry. */ 1191 switch (r_type) 1192 { 1193 default: 1194 case R_390_GOT12: 1195 case R_390_GOT16: 1196 case R_390_GOT20: 1197 case R_390_GOT32: 1198 case R_390_GOTENT: 1199 tls_type = GOT_NORMAL; 1200 break; 1201 case R_390_TLS_GD32: 1202 tls_type = GOT_TLS_GD; 1203 break; 1204 case R_390_TLS_IE32: 1205 case R_390_TLS_GOTIE32: 1206 tls_type = GOT_TLS_IE; 1207 break; 1208 case R_390_TLS_GOTIE12: 1209 case R_390_TLS_GOTIE20: 1210 case R_390_TLS_IEENT: 1211 tls_type = GOT_TLS_IE_NLT; 1212 break; 1213 } 1214 1215 if (h != NULL) 1216 { 1217 h->got.refcount += 1; 1218 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1219 } 1220 else 1221 { 1222 local_got_refcounts[r_symndx] += 1; 1223 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1224 } 1225 /* If a TLS symbol is accessed using IE at least once, 1226 there is no point to use dynamic model for it. */ 1227 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1228 { 1229 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1230 { 1231 (*_bfd_error_handler) 1232 (_("%B: `%s' accessed both as normal and thread local symbol"), 1233 abfd, h->root.root.string); 1234 return FALSE; 1235 } 1236 if (old_tls_type > tls_type) 1237 tls_type = old_tls_type; 1238 } 1239 1240 if (old_tls_type != tls_type) 1241 { 1242 if (h != NULL) 1243 elf_s390_hash_entry (h)->tls_type = tls_type; 1244 else 1245 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1246 } 1247 1248 if (r_type != R_390_TLS_IE32) 1249 break; 1250 /* Fall through. */ 1251 1252 case R_390_TLS_LE32: 1253 /* For static linking and executables this reloc will be 1254 calculated at linktime otherwise a TLS_TPOFF runtime 1255 reloc will be generated. */ 1256 if (r_type == R_390_TLS_LE32 && info->pie) 1257 break; 1258 1259 if (!info->shared) 1260 break; 1261 info->flags |= DF_STATIC_TLS; 1262 /* Fall through. */ 1263 1264 case R_390_8: 1265 case R_390_16: 1266 case R_390_32: 1267 case R_390_PC16: 1268 case R_390_PC12DBL: 1269 case R_390_PC16DBL: 1270 case R_390_PC24DBL: 1271 case R_390_PC32DBL: 1272 case R_390_PC32: 1273 if (h != NULL) 1274 { 1275 /* If this reloc is in a read-only section, we might 1276 need a copy reloc. We can't check reliably at this 1277 stage whether the section is read-only, as input 1278 sections have not yet been mapped to output sections. 1279 Tentatively set the flag for now, and correct in 1280 adjust_dynamic_symbol. */ 1281 h->non_got_ref = 1; 1282 1283 if (!info->shared) 1284 { 1285 /* We may need a .plt entry if the function this reloc 1286 refers to is in a shared lib. */ 1287 h->plt.refcount += 1; 1288 } 1289 } 1290 1291 /* If we are creating a shared library, and this is a reloc 1292 against a global symbol, or a non PC relative reloc 1293 against a local symbol, then we need to copy the reloc 1294 into the shared library. However, if we are linking with 1295 -Bsymbolic, we do not need to copy a reloc against a 1296 global symbol which is defined in an object we are 1297 including in the link (i.e., DEF_REGULAR is set). At 1298 this point we have not seen all the input files, so it is 1299 possible that DEF_REGULAR is not set now but will be set 1300 later (it is never cleared). In case of a weak definition, 1301 DEF_REGULAR may be cleared later by a strong definition in 1302 a shared library. We account for that possibility below by 1303 storing information in the relocs_copied field of the hash 1304 table entry. A similar situation occurs when creating 1305 shared libraries and symbol visibility changes render the 1306 symbol local. 1307 1308 If on the other hand, we are creating an executable, we 1309 may need to keep relocations for symbols satisfied by a 1310 dynamic library if we manage to avoid copy relocs for the 1311 symbol. */ 1312 if ((info->shared 1313 && (sec->flags & SEC_ALLOC) != 0 1314 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 1315 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL 1316 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL 1317 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL 1318 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL 1319 && ELF32_R_TYPE (rel->r_info) != R_390_PC32) 1320 || (h != NULL 1321 && (! SYMBOLIC_BIND (info, h) 1322 || h->root.type == bfd_link_hash_defweak 1323 || !h->def_regular)))) 1324 || (ELIMINATE_COPY_RELOCS 1325 && !info->shared 1326 && (sec->flags & SEC_ALLOC) != 0 1327 && h != NULL 1328 && (h->root.type == bfd_link_hash_defweak 1329 || !h->def_regular))) 1330 { 1331 struct elf_dyn_relocs *p; 1332 struct elf_dyn_relocs **head; 1333 1334 /* We must copy these reloc types into the output file. 1335 Create a reloc section in dynobj and make room for 1336 this reloc. */ 1337 if (sreloc == NULL) 1338 { 1339 if (htab->elf.dynobj == NULL) 1340 htab->elf.dynobj = abfd; 1341 1342 sreloc = _bfd_elf_make_dynamic_reloc_section 1343 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE); 1344 1345 if (sreloc == NULL) 1346 return FALSE; 1347 } 1348 1349 /* If this is a global symbol, we count the number of 1350 relocations we need for this symbol. */ 1351 if (h != NULL) 1352 { 1353 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1354 } 1355 else 1356 { 1357 /* Track dynamic relocs needed for local syms too. 1358 We really need local syms available to do this 1359 easily. Oh well. */ 1360 asection *s; 1361 void *vpp; 1362 1363 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1364 abfd, r_symndx); 1365 if (isym == NULL) 1366 return FALSE; 1367 1368 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1369 if (s == NULL) 1370 s = sec; 1371 1372 vpp = &elf_section_data (s)->local_dynrel; 1373 head = (struct elf_dyn_relocs **) vpp; 1374 } 1375 1376 p = *head; 1377 if (p == NULL || p->sec != sec) 1378 { 1379 bfd_size_type amt = sizeof *p; 1380 1381 p = ((struct elf_dyn_relocs *) 1382 bfd_alloc (htab->elf.dynobj, amt)); 1383 if (p == NULL) 1384 return FALSE; 1385 p->next = *head; 1386 *head = p; 1387 p->sec = sec; 1388 p->count = 0; 1389 p->pc_count = 0; 1390 } 1391 1392 p->count += 1; 1393 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16 1394 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL 1395 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL 1396 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL 1397 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL 1398 || ELF32_R_TYPE (rel->r_info) == R_390_PC32) 1399 p->pc_count += 1; 1400 } 1401 break; 1402 1403 /* This relocation describes the C++ object vtable hierarchy. 1404 Reconstruct it for later use during GC. */ 1405 case R_390_GNU_VTINHERIT: 1406 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1407 return FALSE; 1408 break; 1409 1410 /* This relocation describes which C++ vtable entries are actually 1411 used. Record for later use during GC. */ 1412 case R_390_GNU_VTENTRY: 1413 BFD_ASSERT (h != NULL); 1414 if (h != NULL 1415 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1416 return FALSE; 1417 break; 1418 1419 default: 1420 break; 1421 } 1422 } 1423 1424 return TRUE; 1425 } 1426 1427 /* Return the section that should be marked against GC for a given 1428 relocation. */ 1429 1430 static asection * 1431 elf_s390_gc_mark_hook (asection *sec, 1432 struct bfd_link_info *info, 1433 Elf_Internal_Rela *rel, 1434 struct elf_link_hash_entry *h, 1435 Elf_Internal_Sym *sym) 1436 { 1437 if (h != NULL) 1438 switch (ELF32_R_TYPE (rel->r_info)) 1439 { 1440 case R_390_GNU_VTINHERIT: 1441 case R_390_GNU_VTENTRY: 1442 return NULL; 1443 } 1444 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1445 1446 } 1447 1448 /* Update the got entry reference counts for the section being removed. */ 1449 1450 static bfd_boolean 1451 elf_s390_gc_sweep_hook (bfd *abfd, 1452 struct bfd_link_info *info, 1453 asection *sec, 1454 const Elf_Internal_Rela *relocs) 1455 { 1456 struct elf_s390_link_hash_table *htab; 1457 Elf_Internal_Shdr *symtab_hdr; 1458 struct elf_link_hash_entry **sym_hashes; 1459 bfd_signed_vma *local_got_refcounts; 1460 const Elf_Internal_Rela *rel, *relend; 1461 1462 if (info->relocatable) 1463 return TRUE; 1464 1465 htab = elf_s390_hash_table (info); 1466 if (htab == NULL) 1467 return FALSE; 1468 1469 elf_section_data (sec)->local_dynrel = NULL; 1470 1471 symtab_hdr = &elf_symtab_hdr (abfd); 1472 sym_hashes = elf_sym_hashes (abfd); 1473 local_got_refcounts = elf_local_got_refcounts (abfd); 1474 1475 relend = relocs + sec->reloc_count; 1476 for (rel = relocs; rel < relend; rel++) 1477 { 1478 unsigned long r_symndx; 1479 unsigned int r_type; 1480 struct elf_link_hash_entry *h = NULL; 1481 1482 r_symndx = ELF32_R_SYM (rel->r_info); 1483 if (r_symndx >= symtab_hdr->sh_info) 1484 { 1485 struct elf_s390_link_hash_entry *eh; 1486 struct elf_dyn_relocs **pp; 1487 struct elf_dyn_relocs *p; 1488 1489 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1490 while (h->root.type == bfd_link_hash_indirect 1491 || h->root.type == bfd_link_hash_warning) 1492 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1493 eh = (struct elf_s390_link_hash_entry *) h; 1494 1495 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1496 if (p->sec == sec) 1497 { 1498 /* Everything must go for SEC. */ 1499 *pp = p->next; 1500 break; 1501 } 1502 } 1503 else 1504 { 1505 Elf_Internal_Sym *isym; 1506 1507 /* A local symbol. */ 1508 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1509 abfd, r_symndx); 1510 if (isym == NULL) 1511 return FALSE; 1512 1513 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1514 { 1515 struct plt_entry *plt = elf_s390_local_plt (abfd); 1516 if (plt[r_symndx].plt.refcount > 0) 1517 plt[r_symndx].plt.refcount--; 1518 } 1519 } 1520 1521 r_type = ELF32_R_TYPE (rel->r_info); 1522 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1523 switch (r_type) 1524 { 1525 case R_390_TLS_LDM32: 1526 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1527 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1528 break; 1529 1530 case R_390_TLS_GD32: 1531 case R_390_TLS_IE32: 1532 case R_390_TLS_GOTIE12: 1533 case R_390_TLS_GOTIE20: 1534 case R_390_TLS_GOTIE32: 1535 case R_390_TLS_IEENT: 1536 case R_390_GOT12: 1537 case R_390_GOT16: 1538 case R_390_GOT20: 1539 case R_390_GOT32: 1540 case R_390_GOTOFF16: 1541 case R_390_GOTOFF32: 1542 case R_390_GOTPC: 1543 case R_390_GOTPCDBL: 1544 case R_390_GOTENT: 1545 if (h != NULL) 1546 { 1547 if (h->got.refcount > 0) 1548 h->got.refcount -= 1; 1549 } 1550 else if (local_got_refcounts != NULL) 1551 { 1552 if (local_got_refcounts[r_symndx] > 0) 1553 local_got_refcounts[r_symndx] -= 1; 1554 } 1555 break; 1556 1557 case R_390_8: 1558 case R_390_12: 1559 case R_390_16: 1560 case R_390_20: 1561 case R_390_32: 1562 case R_390_PC16: 1563 case R_390_PC12DBL: 1564 case R_390_PC16DBL: 1565 case R_390_PC24DBL: 1566 case R_390_PC32DBL: 1567 case R_390_PC32: 1568 if (info->shared) 1569 break; 1570 /* Fall through. */ 1571 1572 case R_390_PLT12DBL: 1573 case R_390_PLT16DBL: 1574 case R_390_PLT24DBL: 1575 case R_390_PLT32DBL: 1576 case R_390_PLT32: 1577 case R_390_PLTOFF16: 1578 case R_390_PLTOFF32: 1579 if (h != NULL) 1580 { 1581 if (h->plt.refcount > 0) 1582 h->plt.refcount -= 1; 1583 } 1584 break; 1585 1586 case R_390_GOTPLT12: 1587 case R_390_GOTPLT16: 1588 case R_390_GOTPLT20: 1589 case R_390_GOTPLT32: 1590 case R_390_GOTPLTENT: 1591 if (h != NULL) 1592 { 1593 if (h->plt.refcount > 0) 1594 { 1595 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1596 h->plt.refcount -= 1; 1597 } 1598 } 1599 else if (local_got_refcounts != NULL) 1600 { 1601 if (local_got_refcounts[r_symndx] > 0) 1602 local_got_refcounts[r_symndx] -= 1; 1603 } 1604 break; 1605 1606 default: 1607 break; 1608 } 1609 } 1610 1611 return TRUE; 1612 } 1613 1614 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1615 entry but we found we will not create any. Called when we find we will 1616 not have any PLT for this symbol, by for example 1617 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1618 or elf_s390_size_dynamic_sections if no dynamic sections will be 1619 created (we're only linking static objects). */ 1620 1621 static void 1622 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h) 1623 { 1624 if (h->elf.root.type == bfd_link_hash_warning) 1625 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1626 1627 if (h->gotplt_refcount <= 0) 1628 return; 1629 1630 /* We simply add the number of gotplt references to the number 1631 * of got references for this symbol. */ 1632 h->elf.got.refcount += h->gotplt_refcount; 1633 h->gotplt_refcount = -1; 1634 } 1635 1636 /* Adjust a symbol defined by a dynamic object and referenced by a 1637 regular object. The current definition is in some section of the 1638 dynamic object, but we're not including those sections. We have to 1639 change the definition to something the rest of the link can 1640 understand. */ 1641 1642 static bfd_boolean 1643 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info, 1644 struct elf_link_hash_entry *h) 1645 { 1646 struct elf_s390_link_hash_table *htab; 1647 asection *s; 1648 1649 /* STT_GNU_IFUNC symbol must go through PLT. */ 1650 if (s390_is_ifunc_symbol_p (h)) 1651 return TRUE; 1652 1653 /* If this is a function, put it in the procedure linkage table. We 1654 will fill in the contents of the procedure linkage table later 1655 (although we could actually do it here). */ 1656 if (h->type == STT_FUNC 1657 || h->needs_plt) 1658 { 1659 if (h->plt.refcount <= 0 1660 || SYMBOL_CALLS_LOCAL (info, h) 1661 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1662 && h->root.type != bfd_link_hash_undefweak)) 1663 { 1664 /* This case can occur if we saw a PLT32 reloc in an input 1665 file, but the symbol was never referred to by a dynamic 1666 object, or if all references were garbage collected. In 1667 such a case, we don't actually need to build a procedure 1668 linkage table, and we can just do a PC32 reloc instead. */ 1669 h->plt.offset = (bfd_vma) -1; 1670 h->needs_plt = 0; 1671 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1672 } 1673 1674 return TRUE; 1675 } 1676 else 1677 /* It's possible that we incorrectly decided a .plt reloc was 1678 needed for an R_390_PC32 reloc to a non-function sym in 1679 check_relocs. We can't decide accurately between function and 1680 non-function syms in check-relocs; Objects loaded later in 1681 the link may change h->type. So fix it now. */ 1682 h->plt.offset = (bfd_vma) -1; 1683 1684 /* If this is a weak symbol, and there is a real definition, the 1685 processor independent code will have arranged for us to see the 1686 real definition first, and we can just use the same value. */ 1687 if (h->u.weakdef != NULL) 1688 { 1689 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1690 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1691 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1692 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1693 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1694 h->non_got_ref = h->u.weakdef->non_got_ref; 1695 return TRUE; 1696 } 1697 1698 /* This is a reference to a symbol defined by a dynamic object which 1699 is not a function. */ 1700 1701 /* If we are creating a shared library, we must presume that the 1702 only references to the symbol are via the global offset table. 1703 For such cases we need not do anything here; the relocations will 1704 be handled correctly by relocate_section. */ 1705 if (info->shared) 1706 return TRUE; 1707 1708 /* If there are no references to this symbol that do not use the 1709 GOT, we don't need to generate a copy reloc. */ 1710 if (!h->non_got_ref) 1711 return TRUE; 1712 1713 /* If -z nocopyreloc was given, we won't generate them either. */ 1714 if (info->nocopyreloc) 1715 { 1716 h->non_got_ref = 0; 1717 return TRUE; 1718 } 1719 1720 if (ELIMINATE_COPY_RELOCS) 1721 { 1722 struct elf_s390_link_hash_entry * eh; 1723 struct elf_dyn_relocs *p; 1724 1725 eh = (struct elf_s390_link_hash_entry *) h; 1726 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1727 { 1728 s = p->sec->output_section; 1729 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1730 break; 1731 } 1732 1733 /* If we didn't find any dynamic relocs in read-only sections, then 1734 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1735 if (p == NULL) 1736 { 1737 h->non_got_ref = 0; 1738 return TRUE; 1739 } 1740 } 1741 1742 /* We must allocate the symbol in our .dynbss section, which will 1743 become part of the .bss section of the executable. There will be 1744 an entry for this symbol in the .dynsym section. The dynamic 1745 object will contain position independent code, so all references 1746 from the dynamic object to this symbol will go through the global 1747 offset table. The dynamic linker will use the .dynsym entry to 1748 determine the address it must put in the global offset table, so 1749 both the dynamic object and the regular object will refer to the 1750 same memory location for the variable. */ 1751 1752 htab = elf_s390_hash_table (info); 1753 1754 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1755 copy the initial value out of the dynamic object and into the 1756 runtime process image. */ 1757 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1758 { 1759 htab->srelbss->size += sizeof (Elf32_External_Rela); 1760 h->needs_copy = 1; 1761 } 1762 1763 s = htab->sdynbss; 1764 1765 return _bfd_elf_adjust_dynamic_copy (h, s); 1766 } 1767 1768 /* Allocate space in .plt, .got and associated reloc sections for 1769 dynamic relocs. */ 1770 1771 static bfd_boolean 1772 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1773 { 1774 struct bfd_link_info *info; 1775 struct elf_s390_link_hash_table *htab; 1776 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h; 1777 struct elf_dyn_relocs *p; 1778 1779 if (h->root.type == bfd_link_hash_indirect) 1780 return TRUE; 1781 1782 info = (struct bfd_link_info *) inf; 1783 htab = elf_s390_hash_table (info); 1784 1785 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 1786 here if it is defined and referenced in a non-shared object. */ 1787 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1788 return s390_elf_allocate_ifunc_dyn_relocs (info, h, 1789 &eh->dyn_relocs); 1790 else if (htab->elf.dynamic_sections_created 1791 && h->plt.refcount > 0) 1792 { 1793 /* Make sure this symbol is output as a dynamic symbol. 1794 Undefined weak syms won't yet be marked as dynamic. */ 1795 if (h->dynindx == -1 1796 && !h->forced_local) 1797 { 1798 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1799 return FALSE; 1800 } 1801 1802 if (info->shared 1803 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1804 { 1805 asection *s = htab->elf.splt; 1806 1807 /* If this is the first .plt entry, make room for the special 1808 first entry. */ 1809 if (s->size == 0) 1810 s->size += PLT_FIRST_ENTRY_SIZE; 1811 1812 h->plt.offset = s->size; 1813 1814 /* If this symbol is not defined in a regular file, and we are 1815 not generating a shared library, then set the symbol to this 1816 location in the .plt. This is required to make function 1817 pointers compare as equal between the normal executable and 1818 the shared library. */ 1819 if (! info->shared 1820 && !h->def_regular) 1821 { 1822 h->root.u.def.section = s; 1823 h->root.u.def.value = h->plt.offset; 1824 } 1825 1826 /* Make room for this entry. */ 1827 s->size += PLT_ENTRY_SIZE; 1828 1829 /* We also need to make an entry in the .got.plt section, which 1830 will be placed in the .got section by the linker script. */ 1831 htab->elf.sgotplt->size += GOT_ENTRY_SIZE; 1832 1833 /* We also need to make an entry in the .rela.plt section. */ 1834 htab->elf.srelplt->size += sizeof (Elf32_External_Rela); 1835 } 1836 else 1837 { 1838 h->plt.offset = (bfd_vma) -1; 1839 h->needs_plt = 0; 1840 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1841 } 1842 } 1843 else 1844 { 1845 h->plt.offset = (bfd_vma) -1; 1846 h->needs_plt = 0; 1847 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1848 } 1849 1850 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to 1851 the binary, we can optimize a bit. IE32 and GOTIE32 get converted 1852 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT 1853 we can save the dynamic TLS relocation. */ 1854 if (h->got.refcount > 0 1855 && !info->shared 1856 && h->dynindx == -1 1857 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1858 { 1859 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1860 /* For the GOTIE access without a literal pool entry the offset has 1861 to be stored somewhere. The immediate value in the instruction 1862 is not bit enough so the value is stored in the got. */ 1863 { 1864 h->got.offset = htab->elf.sgot->size; 1865 htab->elf.sgot->size += GOT_ENTRY_SIZE; 1866 } 1867 else 1868 h->got.offset = (bfd_vma) -1; 1869 } 1870 else if (h->got.refcount > 0) 1871 { 1872 asection *s; 1873 bfd_boolean dyn; 1874 int tls_type = elf_s390_hash_entry(h)->tls_type; 1875 1876 /* Make sure this symbol is output as a dynamic symbol. 1877 Undefined weak syms won't yet be marked as dynamic. */ 1878 if (h->dynindx == -1 1879 && !h->forced_local) 1880 { 1881 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1882 return FALSE; 1883 } 1884 1885 s = htab->elf.sgot; 1886 h->got.offset = s->size; 1887 s->size += GOT_ENTRY_SIZE; 1888 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */ 1889 if (tls_type == GOT_TLS_GD) 1890 s->size += GOT_ENTRY_SIZE; 1891 dyn = htab->elf.dynamic_sections_created; 1892 /* R_390_TLS_IE32 needs one dynamic relocation, 1893 R_390_TLS_GD32 needs one if local symbol and two if global. */ 1894 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1895 || tls_type >= GOT_TLS_IE) 1896 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1897 else if (tls_type == GOT_TLS_GD) 1898 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela); 1899 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1900 || h->root.type != bfd_link_hash_undefweak) 1901 && (info->shared 1902 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1903 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1904 } 1905 else 1906 h->got.offset = (bfd_vma) -1; 1907 1908 if (eh->dyn_relocs == NULL) 1909 return TRUE; 1910 1911 /* In the shared -Bsymbolic case, discard space allocated for 1912 dynamic pc-relative relocs against symbols which turn out to be 1913 defined in regular objects. For the normal shared case, discard 1914 space for pc-relative relocs that have become local due to symbol 1915 visibility changes. */ 1916 1917 if (info->shared) 1918 { 1919 if (SYMBOL_CALLS_LOCAL (info, h)) 1920 { 1921 struct elf_dyn_relocs **pp; 1922 1923 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1924 { 1925 p->count -= p->pc_count; 1926 p->pc_count = 0; 1927 if (p->count == 0) 1928 *pp = p->next; 1929 else 1930 pp = &p->next; 1931 } 1932 } 1933 1934 /* Also discard relocs on undefined weak syms with non-default 1935 visibility. */ 1936 if (eh->dyn_relocs != NULL 1937 && h->root.type == bfd_link_hash_undefweak) 1938 { 1939 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1940 eh->dyn_relocs = NULL; 1941 1942 /* Make sure undefined weak symbols are output as a dynamic 1943 symbol in PIEs. */ 1944 else if (h->dynindx == -1 1945 && !h->forced_local) 1946 { 1947 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1948 return FALSE; 1949 } 1950 } 1951 } 1952 else if (ELIMINATE_COPY_RELOCS) 1953 { 1954 /* For the non-shared case, discard space for relocs against 1955 symbols which turn out to need copy relocs or are not 1956 dynamic. */ 1957 1958 if (!h->non_got_ref 1959 && ((h->def_dynamic 1960 && !h->def_regular) 1961 || (htab->elf.dynamic_sections_created 1962 && (h->root.type == bfd_link_hash_undefweak 1963 || h->root.type == bfd_link_hash_undefined)))) 1964 { 1965 /* Make sure this symbol is output as a dynamic symbol. 1966 Undefined weak syms won't yet be marked as dynamic. */ 1967 if (h->dynindx == -1 1968 && !h->forced_local) 1969 { 1970 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1971 return FALSE; 1972 } 1973 1974 /* If that succeeded, we know we'll be keeping all the 1975 relocs. */ 1976 if (h->dynindx != -1) 1977 goto keep; 1978 } 1979 1980 eh->dyn_relocs = NULL; 1981 1982 keep: ; 1983 } 1984 1985 /* Finally, allocate space. */ 1986 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1987 { 1988 asection *sreloc = elf_section_data (p->sec)->sreloc; 1989 1990 sreloc->size += p->count * sizeof (Elf32_External_Rela); 1991 } 1992 1993 return TRUE; 1994 } 1995 1996 /* Find any dynamic relocs that apply to read-only sections. */ 1997 1998 static bfd_boolean 1999 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) 2000 { 2001 struct elf_s390_link_hash_entry *eh; 2002 struct elf_dyn_relocs *p; 2003 2004 eh = (struct elf_s390_link_hash_entry *) h; 2005 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2006 { 2007 asection *s = p->sec->output_section; 2008 2009 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2010 { 2011 struct bfd_link_info *info = (struct bfd_link_info *) inf; 2012 2013 info->flags |= DF_TEXTREL; 2014 2015 /* Not an error, just cut short the traversal. */ 2016 return FALSE; 2017 } 2018 } 2019 return TRUE; 2020 } 2021 2022 /* Set the sizes of the dynamic sections. */ 2023 2024 static bfd_boolean 2025 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 2026 struct bfd_link_info *info) 2027 { 2028 struct elf_s390_link_hash_table *htab; 2029 bfd *dynobj; 2030 asection *s; 2031 bfd_boolean relocs; 2032 bfd *ibfd; 2033 2034 htab = elf_s390_hash_table (info); 2035 dynobj = htab->elf.dynobj; 2036 if (dynobj == NULL) 2037 abort (); 2038 2039 if (htab->elf.dynamic_sections_created) 2040 { 2041 /* Set the contents of the .interp section to the interpreter. */ 2042 if (info->executable) 2043 { 2044 s = bfd_get_linker_section (dynobj, ".interp"); 2045 if (s == NULL) 2046 abort (); 2047 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2048 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2049 } 2050 } 2051 2052 /* Set up .got offsets for local syms, and space for local dynamic 2053 relocs. */ 2054 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2055 { 2056 bfd_signed_vma *local_got; 2057 bfd_signed_vma *end_local_got; 2058 char *local_tls_type; 2059 bfd_size_type locsymcount; 2060 Elf_Internal_Shdr *symtab_hdr; 2061 asection *srela; 2062 struct plt_entry *local_plt; 2063 unsigned int i; 2064 2065 if (! is_s390_elf (ibfd)) 2066 continue; 2067 2068 for (s = ibfd->sections; s != NULL; s = s->next) 2069 { 2070 struct elf_dyn_relocs *p; 2071 2072 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 2073 { 2074 if (!bfd_is_abs_section (p->sec) 2075 && bfd_is_abs_section (p->sec->output_section)) 2076 { 2077 /* Input section has been discarded, either because 2078 it is a copy of a linkonce section or due to 2079 linker script /DISCARD/, so we'll be discarding 2080 the relocs too. */ 2081 } 2082 else if (p->count != 0) 2083 { 2084 srela = elf_section_data (p->sec)->sreloc; 2085 srela->size += p->count * sizeof (Elf32_External_Rela); 2086 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2087 info->flags |= DF_TEXTREL; 2088 } 2089 } 2090 } 2091 2092 local_got = elf_local_got_refcounts (ibfd); 2093 if (!local_got) 2094 continue; 2095 2096 symtab_hdr = &elf_symtab_hdr (ibfd); 2097 locsymcount = symtab_hdr->sh_info; 2098 end_local_got = local_got + locsymcount; 2099 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2100 s = htab->elf.sgot; 2101 srela = htab->elf.srelgot; 2102 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2103 { 2104 if (*local_got > 0) 2105 { 2106 *local_got = s->size; 2107 s->size += GOT_ENTRY_SIZE; 2108 if (*local_tls_type == GOT_TLS_GD) 2109 s->size += GOT_ENTRY_SIZE; 2110 if (info->shared) 2111 srela->size += sizeof (Elf32_External_Rela); 2112 } 2113 else 2114 *local_got = (bfd_vma) -1; 2115 } 2116 local_plt = elf_s390_local_plt (ibfd); 2117 for (i = 0; i < symtab_hdr->sh_info; i++) 2118 { 2119 if (local_plt[i].plt.refcount > 0) 2120 { 2121 local_plt[i].plt.offset = htab->elf.iplt->size; 2122 htab->elf.iplt->size += PLT_ENTRY_SIZE; 2123 htab->elf.igotplt->size += GOT_ENTRY_SIZE; 2124 htab->elf.irelplt->size += RELA_ENTRY_SIZE; 2125 } 2126 else 2127 local_plt[i].plt.offset = (bfd_vma) -1; 2128 } 2129 } 2130 2131 if (htab->tls_ldm_got.refcount > 0) 2132 { 2133 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32 2134 relocs. */ 2135 htab->tls_ldm_got.offset = htab->elf.sgot->size; 2136 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; 2137 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 2138 } 2139 else 2140 htab->tls_ldm_got.offset = -1; 2141 2142 /* Allocate global sym .plt and .got entries, and space for global 2143 sym dynamic relocs. */ 2144 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 2145 2146 /* We now have determined the sizes of the various dynamic sections. 2147 Allocate memory for them. */ 2148 relocs = FALSE; 2149 for (s = dynobj->sections; s != NULL; s = s->next) 2150 { 2151 if ((s->flags & SEC_LINKER_CREATED) == 0) 2152 continue; 2153 2154 if (s == htab->elf.splt 2155 || s == htab->elf.sgot 2156 || s == htab->elf.sgotplt 2157 || s == htab->sdynbss 2158 || s == htab->elf.iplt 2159 || s == htab->elf.igotplt 2160 || s == htab->irelifunc) 2161 { 2162 /* Strip this section if we don't need it; see the 2163 comment below. */ 2164 } 2165 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2166 { 2167 if (s->size != 0) 2168 relocs = TRUE; 2169 2170 /* We use the reloc_count field as a counter if we need 2171 to copy relocs into the output file. */ 2172 s->reloc_count = 0; 2173 } 2174 else 2175 { 2176 /* It's not one of our sections, so don't allocate space. */ 2177 continue; 2178 } 2179 2180 if (s->size == 0) 2181 { 2182 /* If we don't need this section, strip it from the 2183 output file. This is to handle .rela.bss and 2184 .rela.plt. We must create it in 2185 create_dynamic_sections, because it must be created 2186 before the linker maps input sections to output 2187 sections. The linker does that before 2188 adjust_dynamic_symbol is called, and it is that 2189 function which decides whether anything needs to go 2190 into these sections. */ 2191 2192 s->flags |= SEC_EXCLUDE; 2193 continue; 2194 } 2195 2196 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2197 continue; 2198 2199 /* Allocate memory for the section contents. We use bfd_zalloc 2200 here in case unused entries are not reclaimed before the 2201 section's contents are written out. This should not happen, 2202 but this way if it does, we get a R_390_NONE reloc instead 2203 of garbage. */ 2204 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2205 if (s->contents == NULL) 2206 return FALSE; 2207 } 2208 2209 if (htab->elf.dynamic_sections_created) 2210 { 2211 /* Add some entries to the .dynamic section. We fill in the 2212 values later, in elf_s390_finish_dynamic_sections, but we 2213 must add the entries now so that we get the correct size for 2214 the .dynamic section. The DT_DEBUG entry is filled in by the 2215 dynamic linker and used by the debugger. */ 2216 #define add_dynamic_entry(TAG, VAL) \ 2217 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2218 2219 if (info->executable) 2220 { 2221 if (!add_dynamic_entry (DT_DEBUG, 0)) 2222 return FALSE; 2223 } 2224 2225 if (htab->elf.splt->size != 0) 2226 { 2227 if (!add_dynamic_entry (DT_PLTGOT, 0) 2228 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2229 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2230 || !add_dynamic_entry (DT_JMPREL, 0)) 2231 return FALSE; 2232 } 2233 2234 if (relocs) 2235 { 2236 if (!add_dynamic_entry (DT_RELA, 0) 2237 || !add_dynamic_entry (DT_RELASZ, 0) 2238 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 2239 return FALSE; 2240 2241 /* If any dynamic relocs apply to a read-only section, 2242 then we need a DT_TEXTREL entry. */ 2243 if ((info->flags & DF_TEXTREL) == 0) 2244 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); 2245 2246 if ((info->flags & DF_TEXTREL) != 0) 2247 { 2248 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2249 return FALSE; 2250 } 2251 } 2252 } 2253 #undef add_dynamic_entry 2254 2255 return TRUE; 2256 } 2257 2258 /* Return the base VMA address which should be subtracted from real addresses 2259 when resolving @dtpoff relocation. 2260 This is PT_TLS segment p_vaddr. */ 2261 2262 static bfd_vma 2263 dtpoff_base (struct bfd_link_info *info) 2264 { 2265 /* If tls_sec is NULL, we should have signalled an error already. */ 2266 if (elf_hash_table (info)->tls_sec == NULL) 2267 return 0; 2268 return elf_hash_table (info)->tls_sec->vma; 2269 } 2270 2271 /* Return the relocation value for @tpoff relocation 2272 if STT_TLS virtual address is ADDRESS. */ 2273 2274 static bfd_vma 2275 tpoff (struct bfd_link_info *info, bfd_vma address) 2276 { 2277 struct elf_link_hash_table *htab = elf_hash_table (info); 2278 2279 /* If tls_sec is NULL, we should have signalled an error already. */ 2280 if (htab->tls_sec == NULL) 2281 return 0; 2282 return htab->tls_size + htab->tls_sec->vma - address; 2283 } 2284 2285 /* Complain if TLS instruction relocation is against an invalid 2286 instruction. */ 2287 2288 static void 2289 invalid_tls_insn (bfd *input_bfd, 2290 asection *input_section, 2291 Elf_Internal_Rela *rel) 2292 { 2293 reloc_howto_type *howto; 2294 2295 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info); 2296 (*_bfd_error_handler) 2297 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"), 2298 input_bfd, 2299 input_section, 2300 (long) rel->r_offset, 2301 howto->name); 2302 bfd_set_error (bfd_error_bad_value); 2303 } 2304 2305 /* Relocate a 390 ELF section. */ 2306 2307 static bfd_boolean 2308 elf_s390_relocate_section (bfd *output_bfd, 2309 struct bfd_link_info *info, 2310 bfd *input_bfd, 2311 asection *input_section, 2312 bfd_byte *contents, 2313 Elf_Internal_Rela *relocs, 2314 Elf_Internal_Sym *local_syms, 2315 asection **local_sections) 2316 { 2317 struct elf_s390_link_hash_table *htab; 2318 Elf_Internal_Shdr *symtab_hdr; 2319 struct elf_link_hash_entry **sym_hashes; 2320 bfd_vma *local_got_offsets; 2321 Elf_Internal_Rela *rel; 2322 Elf_Internal_Rela *relend; 2323 2324 BFD_ASSERT (is_s390_elf (input_bfd)); 2325 2326 htab = elf_s390_hash_table (info); 2327 symtab_hdr = &elf_symtab_hdr (input_bfd); 2328 sym_hashes = elf_sym_hashes (input_bfd); 2329 local_got_offsets = elf_local_got_offsets (input_bfd); 2330 2331 rel = relocs; 2332 relend = relocs + input_section->reloc_count; 2333 for (; rel < relend; rel++) 2334 { 2335 unsigned int r_type; 2336 reloc_howto_type *howto; 2337 unsigned long r_symndx; 2338 struct elf_link_hash_entry *h; 2339 Elf_Internal_Sym *sym; 2340 asection *sec; 2341 bfd_vma off; 2342 bfd_vma relocation; 2343 bfd_boolean unresolved_reloc; 2344 bfd_reloc_status_type r; 2345 int tls_type; 2346 asection *base_got = htab->elf.sgot; 2347 2348 r_type = ELF32_R_TYPE (rel->r_info); 2349 if (r_type == (int) R_390_GNU_VTINHERIT 2350 || r_type == (int) R_390_GNU_VTENTRY) 2351 continue; 2352 if (r_type >= (int) R_390_max) 2353 { 2354 bfd_set_error (bfd_error_bad_value); 2355 return FALSE; 2356 } 2357 2358 howto = elf_howto_table + r_type; 2359 r_symndx = ELF32_R_SYM (rel->r_info); 2360 2361 h = NULL; 2362 sym = NULL; 2363 sec = NULL; 2364 unresolved_reloc = FALSE; 2365 if (r_symndx < symtab_hdr->sh_info) 2366 { 2367 sym = local_syms + r_symndx; 2368 sec = local_sections[r_symndx]; 2369 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2370 { 2371 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd); 2372 if (local_plt == NULL) 2373 return FALSE; 2374 2375 /* Address of the PLT slot. */ 2376 relocation = (htab->elf.iplt->output_section->vma 2377 + htab->elf.iplt->output_offset 2378 + local_plt[r_symndx].plt.offset); 2379 2380 switch (r_type) 2381 { 2382 case R_390_PLTOFF16: 2383 case R_390_PLTOFF32: 2384 relocation -= htab->elf.sgot->output_section->vma; 2385 break; 2386 case R_390_GOTPLT12: 2387 case R_390_GOTPLT16: 2388 case R_390_GOTPLT20: 2389 case R_390_GOTPLT32: 2390 case R_390_GOTPLTENT: 2391 case R_390_GOT12: 2392 case R_390_GOT16: 2393 case R_390_GOT20: 2394 case R_390_GOT32: 2395 case R_390_GOTENT: 2396 { 2397 /* Write the PLT slot address into the GOT slot. */ 2398 bfd_put_32 (output_bfd, relocation, 2399 htab->elf.sgot->contents + 2400 local_got_offsets[r_symndx]); 2401 relocation = (local_got_offsets[r_symndx] + 2402 htab->elf.sgot->output_offset); 2403 2404 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2405 relocation += htab->elf.sgot->output_section->vma; 2406 break; 2407 } 2408 default: 2409 break; 2410 } 2411 /* The output section is needed later in 2412 finish_dynamic_section when creating the dynamic 2413 relocation. */ 2414 local_plt[r_symndx].sec = sec; 2415 goto do_relocation; 2416 } 2417 else 2418 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2419 } 2420 else 2421 { 2422 bfd_boolean warned ATTRIBUTE_UNUSED; 2423 bfd_boolean ignored ATTRIBUTE_UNUSED; 2424 2425 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2426 r_symndx, symtab_hdr, sym_hashes, 2427 h, sec, relocation, 2428 unresolved_reloc, warned, ignored); 2429 } 2430 2431 if (sec != NULL && discarded_section (sec)) 2432 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2433 rel, 1, relend, howto, 0, contents); 2434 2435 if (info->relocatable) 2436 continue; 2437 2438 switch (r_type) 2439 { 2440 case R_390_GOTPLT12: 2441 case R_390_GOTPLT16: 2442 case R_390_GOTPLT20: 2443 case R_390_GOTPLT32: 2444 case R_390_GOTPLTENT: 2445 /* There are three cases for a GOTPLT relocation. 1) The 2446 relocation is against the jump slot entry of a plt that 2447 will get emitted to the output file. 2) The relocation 2448 is against the jump slot of a plt entry that has been 2449 removed. elf_s390_adjust_gotplt has created a GOT entry 2450 as replacement. 3) The relocation is against a local symbol. 2451 Cases 2) and 3) are the same as the GOT relocation code 2452 so we just have to test for case 1 and fall through for 2453 the other two. */ 2454 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2455 { 2456 bfd_vma plt_index; 2457 2458 if (s390_is_ifunc_symbol_p (h)) 2459 { 2460 plt_index = h->plt.offset / PLT_ENTRY_SIZE; 2461 relocation = (plt_index * GOT_ENTRY_SIZE + 2462 htab->elf.igotplt->output_offset); 2463 if (r_type == R_390_GOTPLTENT) 2464 relocation += htab->elf.igotplt->output_section->vma; 2465 } 2466 else 2467 { 2468 /* Calc. index no. 2469 Current offset - size first entry / entry size. */ 2470 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2471 PLT_ENTRY_SIZE; 2472 2473 /* Offset in GOT is PLT index plus GOT headers(3) 2474 times 4, addr & GOT addr. */ 2475 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2476 if (r_type == R_390_GOTPLTENT) 2477 relocation += htab->elf.sgot->output_section->vma; 2478 } 2479 unresolved_reloc = FALSE; 2480 2481 } 2482 /* Fall through. */ 2483 2484 case R_390_GOT12: 2485 case R_390_GOT16: 2486 case R_390_GOT20: 2487 case R_390_GOT32: 2488 case R_390_GOTENT: 2489 /* Relocation is to the entry for this symbol in the global 2490 offset table. */ 2491 if (base_got == NULL) 2492 abort (); 2493 2494 if (h != NULL) 2495 { 2496 bfd_boolean dyn; 2497 2498 off = h->got.offset; 2499 dyn = htab->elf.dynamic_sections_created; 2500 2501 if (s390_is_ifunc_symbol_p (h)) 2502 { 2503 BFD_ASSERT (h->plt.offset != (bfd_vma) -1); 2504 if (off == (bfd_vma)-1) 2505 { 2506 /* No explicit GOT usage so redirect to the 2507 got.iplt slot. */ 2508 base_got = htab->elf.igotplt; 2509 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE; 2510 } 2511 else 2512 { 2513 /* Explicit GOT slots must contain the address 2514 of the PLT slot. This will be handled in 2515 finish_dynamic_symbol. */ 2516 } 2517 } 2518 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2519 || (info->shared 2520 && SYMBOL_REFERENCES_LOCAL (info, h)) 2521 || (ELF_ST_VISIBILITY (h->other) 2522 && h->root.type == bfd_link_hash_undefweak)) 2523 2524 { 2525 /* This is actually a static link, or it is a 2526 -Bsymbolic link and the symbol is defined 2527 locally, or the symbol was forced to be local 2528 because of a version file. We must initialize 2529 this entry in the global offset table. Since the 2530 offset must always be a multiple of 2, we use the 2531 least significant bit to record whether we have 2532 initialized it already. 2533 2534 When doing a dynamic link, we create a .rel.got 2535 relocation entry to initialize the value. This 2536 is done in the finish_dynamic_symbol routine. */ 2537 if ((off & 1) != 0) 2538 off &= ~1; 2539 else 2540 { 2541 bfd_put_32 (output_bfd, relocation, 2542 base_got->contents + off); 2543 h->got.offset |= 1; 2544 } 2545 2546 if ((h->def_regular 2547 && info->shared 2548 && SYMBOL_REFERENCES_LOCAL (info, h)) 2549 /* lrl rx,sym@GOTENT -> larl rx, sym */ 2550 && ((r_type == R_390_GOTENT 2551 && (bfd_get_16 (input_bfd, 2552 contents + rel->r_offset - 2) 2553 & 0xff0f) == 0xc40d) 2554 /* ly rx, sym@GOT(r12) -> larl rx, sym */ 2555 || (r_type == R_390_GOT20 2556 && (bfd_get_32 (input_bfd, 2557 contents + rel->r_offset - 2) 2558 & 0xff00f000) == 0xe300c000 2559 && bfd_get_8 (input_bfd, 2560 contents + rel->r_offset + 3) == 0x58))) 2561 { 2562 unsigned short new_insn = 2563 (0xc000 | (bfd_get_8 (input_bfd, 2564 contents + rel->r_offset - 1) & 0xf0)); 2565 bfd_put_16 (output_bfd, new_insn, 2566 contents + rel->r_offset - 2); 2567 r_type = R_390_PC32DBL; 2568 rel->r_addend = 2; 2569 howto = elf_howto_table + r_type; 2570 relocation = h->root.u.def.value 2571 + h->root.u.def.section->output_section->vma 2572 + h->root.u.def.section->output_offset; 2573 goto do_relocation; 2574 } 2575 } 2576 else 2577 unresolved_reloc = FALSE; 2578 } 2579 else 2580 { 2581 if (local_got_offsets == NULL) 2582 abort (); 2583 2584 off = local_got_offsets[r_symndx]; 2585 2586 /* The offset must always be a multiple of 4. We use 2587 the least significant bit to record whether we have 2588 already generated the necessary reloc. */ 2589 if ((off & 1) != 0) 2590 off &= ~1; 2591 else 2592 { 2593 bfd_put_32 (output_bfd, relocation, 2594 htab->elf.sgot->contents + off); 2595 2596 if (info->shared) 2597 { 2598 asection *srelgot; 2599 Elf_Internal_Rela outrel; 2600 bfd_byte *loc; 2601 2602 srelgot = htab->elf.srelgot; 2603 if (srelgot == NULL) 2604 abort (); 2605 2606 outrel.r_offset = (htab->elf.sgot->output_section->vma 2607 + htab->elf.sgot->output_offset 2608 + off); 2609 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2610 outrel.r_addend = relocation; 2611 loc = srelgot->contents; 2612 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 2613 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2614 } 2615 2616 local_got_offsets[r_symndx] |= 1; 2617 } 2618 } 2619 2620 if (off >= (bfd_vma) -2) 2621 abort (); 2622 2623 relocation = base_got->output_offset + off; 2624 2625 /* For @GOTENT the relocation is against the offset between 2626 the instruction and the symbols entry in the GOT and not 2627 between the start of the GOT and the symbols entry. We 2628 add the vma of the GOT to get the correct value. */ 2629 if ( r_type == R_390_GOTENT 2630 || r_type == R_390_GOTPLTENT) 2631 relocation += base_got->output_section->vma; 2632 2633 break; 2634 2635 case R_390_GOTOFF16: 2636 case R_390_GOTOFF32: 2637 /* Relocation is relative to the start of the global offset 2638 table. */ 2639 2640 /* Note that sgot->output_offset is not involved in this 2641 calculation. We always want the start of .got. If we 2642 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2643 permitted by the ABI, we might have to change this 2644 calculation. */ 2645 relocation -= htab->elf.sgot->output_section->vma; 2646 break; 2647 2648 case R_390_GOTPC: 2649 case R_390_GOTPCDBL: 2650 /* Use global offset table as symbol value. */ 2651 relocation = htab->elf.sgot->output_section->vma; 2652 unresolved_reloc = FALSE; 2653 break; 2654 2655 case R_390_PLT12DBL: 2656 case R_390_PLT16DBL: 2657 case R_390_PLT24DBL: 2658 case R_390_PLT32DBL: 2659 case R_390_PLT32: 2660 /* Relocation is to the entry for this symbol in the 2661 procedure linkage table. */ 2662 2663 /* Resolve a PLT32 reloc against a local symbol directly, 2664 without using the procedure linkage table. */ 2665 if (h == NULL) 2666 break; 2667 2668 if (h->plt.offset == (bfd_vma) -1 2669 || (htab->elf.splt == NULL && htab->elf.iplt == NULL)) 2670 { 2671 /* We didn't make a PLT entry for this symbol. This 2672 happens when statically linking PIC code, or when 2673 using -Bsymbolic. */ 2674 break; 2675 } 2676 2677 if (s390_is_ifunc_symbol_p (h)) 2678 relocation = (htab->elf.iplt->output_section->vma 2679 + htab->elf.iplt->output_offset 2680 + h->plt.offset); 2681 else 2682 relocation = (htab->elf.splt->output_section->vma 2683 + htab->elf.splt->output_offset 2684 + h->plt.offset); 2685 unresolved_reloc = FALSE; 2686 break; 2687 2688 case R_390_PLTOFF16: 2689 case R_390_PLTOFF32: 2690 /* Relocation is to the entry for this symbol in the 2691 procedure linkage table relative to the start of the GOT. */ 2692 2693 /* For local symbols or if we didn't make a PLT entry for 2694 this symbol resolve the symbol directly. */ 2695 if (h == NULL 2696 || h->plt.offset == (bfd_vma) -1 2697 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h))) 2698 { 2699 relocation -= htab->elf.sgot->output_section->vma; 2700 break; 2701 } 2702 2703 if (s390_is_ifunc_symbol_p (h)) 2704 relocation = (htab->elf.iplt->output_section->vma 2705 + htab->elf.iplt->output_offset 2706 + h->plt.offset 2707 - htab->elf.sgot->output_section->vma); 2708 else 2709 relocation = (htab->elf.splt->output_section->vma 2710 + htab->elf.splt->output_offset 2711 + h->plt.offset 2712 - htab->elf.sgot->output_section->vma); 2713 unresolved_reloc = FALSE; 2714 break; 2715 2716 case R_390_8: 2717 case R_390_16: 2718 case R_390_32: 2719 case R_390_PC16: 2720 case R_390_PC12DBL: 2721 case R_390_PC16DBL: 2722 case R_390_PC24DBL: 2723 case R_390_PC32DBL: 2724 case R_390_PC32: 2725 if (h != NULL 2726 && s390_is_ifunc_symbol_p (h) 2727 && h->def_regular) 2728 { 2729 if (!info->shared || !h->non_got_ref) 2730 { 2731 /* For a non-shared object STT_GNU_IFUNC symbol must 2732 go through PLT. */ 2733 relocation = (htab->elf.iplt->output_section->vma 2734 + htab->elf.iplt->output_offset 2735 + h ->plt.offset); 2736 goto do_relocation; 2737 } 2738 else 2739 { 2740 /* For shared objects a runtime relocation is needed. */ 2741 2742 Elf_Internal_Rela outrel; 2743 asection *sreloc; 2744 2745 /* Need a dynamic relocation to get the real function 2746 address. */ 2747 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2748 info, 2749 input_section, 2750 rel->r_offset); 2751 if (outrel.r_offset == (bfd_vma) -1 2752 || outrel.r_offset == (bfd_vma) -2) 2753 abort (); 2754 2755 outrel.r_offset += (input_section->output_section->vma 2756 + input_section->output_offset); 2757 2758 if (h->dynindx == -1 2759 || h->forced_local 2760 || info->executable) 2761 { 2762 /* This symbol is resolved locally. */ 2763 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 2764 outrel.r_addend = (h->root.u.def.value 2765 + h->root.u.def.section->output_section->vma 2766 + h->root.u.def.section->output_offset); 2767 } 2768 else 2769 { 2770 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2771 outrel.r_addend = 0; 2772 } 2773 2774 sreloc = htab->elf.irelifunc; 2775 elf_append_rela (output_bfd, sreloc, &outrel); 2776 2777 /* If this reloc is against an external symbol, we 2778 do not want to fiddle with the addend. Otherwise, 2779 we need to include the symbol value so that it 2780 becomes an addend for the dynamic reloc. For an 2781 internal symbol, we have updated addend. */ 2782 continue; 2783 } 2784 } 2785 2786 if ((input_section->flags & SEC_ALLOC) == 0) 2787 break; 2788 2789 if ((info->shared 2790 && (h == NULL 2791 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2792 || h->root.type != bfd_link_hash_undefweak) 2793 && ((r_type != R_390_PC16 2794 && r_type != R_390_PC12DBL 2795 && r_type != R_390_PC16DBL 2796 && r_type != R_390_PC24DBL 2797 && r_type != R_390_PC32DBL 2798 && r_type != R_390_PC32) 2799 || !SYMBOL_CALLS_LOCAL (info, h))) 2800 || (ELIMINATE_COPY_RELOCS 2801 && !info->shared 2802 && h != NULL 2803 && h->dynindx != -1 2804 && !h->non_got_ref 2805 && ((h->def_dynamic 2806 && !h->def_regular) 2807 || h->root.type == bfd_link_hash_undefweak 2808 || h->root.type == bfd_link_hash_undefined))) 2809 { 2810 Elf_Internal_Rela outrel; 2811 bfd_boolean skip, relocate; 2812 asection *sreloc; 2813 bfd_byte *loc; 2814 2815 /* When generating a shared object, these relocations 2816 are copied into the output file to be resolved at run 2817 time. */ 2818 2819 skip = FALSE; 2820 relocate = FALSE; 2821 2822 outrel.r_offset = 2823 _bfd_elf_section_offset (output_bfd, info, input_section, 2824 rel->r_offset); 2825 if (outrel.r_offset == (bfd_vma) -1) 2826 skip = TRUE; 2827 else if (outrel.r_offset == (bfd_vma) -2) 2828 skip = TRUE, relocate = TRUE; 2829 outrel.r_offset += (input_section->output_section->vma 2830 + input_section->output_offset); 2831 2832 if (skip) 2833 memset (&outrel, 0, sizeof outrel); 2834 else if (h != NULL 2835 && h->dynindx != -1 2836 && (r_type == R_390_PC16 2837 || r_type == R_390_PC12DBL 2838 || r_type == R_390_PC16DBL 2839 || r_type == R_390_PC24DBL 2840 || r_type == R_390_PC32DBL 2841 || r_type == R_390_PC32 2842 || !info->shared 2843 || !SYMBOLIC_BIND (info, h) 2844 || !h->def_regular)) 2845 { 2846 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2847 outrel.r_addend = rel->r_addend; 2848 } 2849 else 2850 { 2851 /* This symbol is local, or marked to become local. */ 2852 outrel.r_addend = relocation + rel->r_addend; 2853 if (r_type == R_390_32) 2854 { 2855 relocate = TRUE; 2856 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2857 } 2858 else 2859 { 2860 long sindx; 2861 2862 if (bfd_is_abs_section (sec)) 2863 sindx = 0; 2864 else if (sec == NULL || sec->owner == NULL) 2865 { 2866 bfd_set_error(bfd_error_bad_value); 2867 return FALSE; 2868 } 2869 else 2870 { 2871 asection *osec; 2872 2873 osec = sec->output_section; 2874 sindx = elf_section_data (osec)->dynindx; 2875 if (sindx == 0) 2876 { 2877 osec = htab->elf.text_index_section; 2878 sindx = elf_section_data (osec)->dynindx; 2879 } 2880 BFD_ASSERT (sindx != 0); 2881 2882 /* We are turning this relocation into one 2883 against a section symbol, so subtract out 2884 the output section's address but not the 2885 offset of the input section in the output 2886 section. */ 2887 outrel.r_addend -= osec->vma; 2888 } 2889 outrel.r_info = ELF32_R_INFO (sindx, r_type); 2890 } 2891 } 2892 2893 sreloc = elf_section_data (input_section)->sreloc; 2894 if (sreloc == NULL) 2895 abort (); 2896 2897 loc = sreloc->contents; 2898 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2899 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2900 2901 /* If this reloc is against an external symbol, we do 2902 not want to fiddle with the addend. Otherwise, we 2903 need to include the symbol value so that it becomes 2904 an addend for the dynamic reloc. */ 2905 if (! relocate) 2906 continue; 2907 } 2908 break; 2909 2910 /* Relocations for tls literal pool entries. */ 2911 case R_390_TLS_IE32: 2912 if (info->shared) 2913 { 2914 Elf_Internal_Rela outrel; 2915 asection *sreloc; 2916 bfd_byte *loc; 2917 2918 outrel.r_offset = rel->r_offset 2919 + input_section->output_section->vma 2920 + input_section->output_offset; 2921 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2922 sreloc = elf_section_data (input_section)->sreloc; 2923 if (sreloc == NULL) 2924 abort (); 2925 loc = sreloc->contents; 2926 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2927 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2928 } 2929 /* Fall through. */ 2930 2931 case R_390_TLS_GD32: 2932 case R_390_TLS_GOTIE32: 2933 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2934 tls_type = GOT_UNKNOWN; 2935 if (h == NULL && local_got_offsets) 2936 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2937 else if (h != NULL) 2938 { 2939 tls_type = elf_s390_hash_entry(h)->tls_type; 2940 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2941 r_type = R_390_TLS_LE32; 2942 } 2943 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE) 2944 r_type = R_390_TLS_IE32; 2945 2946 if (r_type == R_390_TLS_LE32) 2947 { 2948 /* This relocation gets optimized away by the local exec 2949 access optimization. */ 2950 BFD_ASSERT (! unresolved_reloc); 2951 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2952 contents + rel->r_offset); 2953 continue; 2954 } 2955 2956 if (htab->elf.sgot == NULL) 2957 abort (); 2958 2959 if (h != NULL) 2960 off = h->got.offset; 2961 else 2962 { 2963 if (local_got_offsets == NULL) 2964 abort (); 2965 2966 off = local_got_offsets[r_symndx]; 2967 } 2968 2969 emit_tls_relocs: 2970 2971 if ((off & 1) != 0) 2972 off &= ~1; 2973 else 2974 { 2975 Elf_Internal_Rela outrel; 2976 bfd_byte *loc; 2977 int dr_type, indx; 2978 2979 if (htab->elf.srelgot == NULL) 2980 abort (); 2981 2982 outrel.r_offset = (htab->elf.sgot->output_section->vma 2983 + htab->elf.sgot->output_offset + off); 2984 2985 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2986 if (r_type == R_390_TLS_GD32) 2987 dr_type = R_390_TLS_DTPMOD; 2988 else 2989 dr_type = R_390_TLS_TPOFF; 2990 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2991 outrel.r_addend = relocation - dtpoff_base (info); 2992 else 2993 outrel.r_addend = 0; 2994 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2995 loc = htab->elf.srelgot->contents; 2996 loc += htab->elf.srelgot->reloc_count++ 2997 * sizeof (Elf32_External_Rela); 2998 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2999 3000 if (r_type == R_390_TLS_GD32) 3001 { 3002 if (indx == 0) 3003 { 3004 BFD_ASSERT (! unresolved_reloc); 3005 bfd_put_32 (output_bfd, 3006 relocation - dtpoff_base (info), 3007 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3008 } 3009 else 3010 { 3011 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF); 3012 outrel.r_offset += GOT_ENTRY_SIZE; 3013 outrel.r_addend = 0; 3014 htab->elf.srelgot->reloc_count++; 3015 loc += sizeof (Elf32_External_Rela); 3016 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3017 } 3018 } 3019 3020 if (h != NULL) 3021 h->got.offset |= 1; 3022 else 3023 local_got_offsets[r_symndx] |= 1; 3024 } 3025 3026 if (off >= (bfd_vma) -2) 3027 abort (); 3028 if (r_type == ELF32_R_TYPE (rel->r_info)) 3029 { 3030 relocation = htab->elf.sgot->output_offset + off; 3031 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT) 3032 relocation += htab->elf.sgot->output_section->vma; 3033 unresolved_reloc = FALSE; 3034 } 3035 else 3036 { 3037 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off, 3038 contents + rel->r_offset); 3039 continue; 3040 } 3041 break; 3042 3043 case R_390_TLS_GOTIE12: 3044 case R_390_TLS_GOTIE20: 3045 case R_390_TLS_IEENT: 3046 if (h == NULL) 3047 { 3048 if (local_got_offsets == NULL) 3049 abort(); 3050 off = local_got_offsets[r_symndx]; 3051 if (info->shared) 3052 goto emit_tls_relocs; 3053 } 3054 else 3055 { 3056 off = h->got.offset; 3057 tls_type = elf_s390_hash_entry(h)->tls_type; 3058 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 3059 goto emit_tls_relocs; 3060 } 3061 3062 if (htab->elf.sgot == NULL) 3063 abort (); 3064 3065 BFD_ASSERT (! unresolved_reloc); 3066 bfd_put_32 (output_bfd, -tpoff (info, relocation), 3067 htab->elf.sgot->contents + off); 3068 relocation = htab->elf.sgot->output_offset + off; 3069 if (r_type == R_390_TLS_IEENT) 3070 relocation += htab->elf.sgot->output_section->vma; 3071 unresolved_reloc = FALSE; 3072 break; 3073 3074 case R_390_TLS_LDM32: 3075 if (! info->shared) 3076 /* The literal pool entry this relocation refers to gets ignored 3077 by the optimized code of the local exec model. Do nothing 3078 and the value will turn out zero. */ 3079 continue; 3080 3081 if (htab->elf.sgot == NULL) 3082 abort (); 3083 3084 off = htab->tls_ldm_got.offset; 3085 if (off & 1) 3086 off &= ~1; 3087 else 3088 { 3089 Elf_Internal_Rela outrel; 3090 bfd_byte *loc; 3091 3092 if (htab->elf.srelgot == NULL) 3093 abort (); 3094 3095 outrel.r_offset = (htab->elf.sgot->output_section->vma 3096 + htab->elf.sgot->output_offset + off); 3097 3098 bfd_put_32 (output_bfd, 0, 3099 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3100 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD); 3101 outrel.r_addend = 0; 3102 loc = htab->elf.srelgot->contents; 3103 loc += htab->elf.srelgot->reloc_count++ 3104 * sizeof (Elf32_External_Rela); 3105 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3106 htab->tls_ldm_got.offset |= 1; 3107 } 3108 relocation = htab->elf.sgot->output_offset + off; 3109 unresolved_reloc = FALSE; 3110 break; 3111 3112 case R_390_TLS_LE32: 3113 if (info->shared && !info->pie) 3114 { 3115 /* Linking a shared library with non-fpic code requires 3116 a R_390_TLS_TPOFF relocation. */ 3117 Elf_Internal_Rela outrel; 3118 asection *sreloc; 3119 bfd_byte *loc; 3120 int indx; 3121 3122 outrel.r_offset = rel->r_offset 3123 + input_section->output_section->vma 3124 + input_section->output_offset; 3125 if (h != NULL && h->dynindx != -1) 3126 indx = h->dynindx; 3127 else 3128 indx = 0; 3129 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF); 3130 if (indx == 0) 3131 outrel.r_addend = relocation - dtpoff_base (info); 3132 else 3133 outrel.r_addend = 0; 3134 sreloc = elf_section_data (input_section)->sreloc; 3135 if (sreloc == NULL) 3136 abort (); 3137 loc = sreloc->contents; 3138 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 3139 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3140 } 3141 else 3142 { 3143 BFD_ASSERT (! unresolved_reloc); 3144 bfd_put_32 (output_bfd, -tpoff (info, relocation), 3145 contents + rel->r_offset); 3146 } 3147 continue; 3148 3149 case R_390_TLS_LDO32: 3150 if (info->shared || (input_section->flags & SEC_DEBUGGING)) 3151 relocation -= dtpoff_base (info); 3152 else 3153 /* When converting LDO to LE, we must negate. */ 3154 relocation = -tpoff (info, relocation); 3155 break; 3156 3157 /* Relocations for tls instructions. */ 3158 case R_390_TLS_LOAD: 3159 case R_390_TLS_GDCALL: 3160 case R_390_TLS_LDCALL: 3161 tls_type = GOT_UNKNOWN; 3162 if (h == NULL && local_got_offsets) 3163 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 3164 else if (h != NULL) 3165 tls_type = elf_s390_hash_entry(h)->tls_type; 3166 3167 if (tls_type == GOT_TLS_GD) 3168 continue; 3169 3170 if (r_type == R_390_TLS_LOAD) 3171 { 3172 if (!info->shared && (h == NULL || h->dynindx == -1)) 3173 { 3174 /* IE->LE transition. Four valid cases: 3175 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 3176 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 3177 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 3178 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 3179 unsigned int insn, ry; 3180 3181 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3182 ry = 0; 3183 if ((insn & 0xff00f000) == 0x58000000) 3184 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */ 3185 ry = (insn & 0x000f0000); 3186 else if ((insn & 0xff0f0000) == 0x58000000) 3187 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */ 3188 ry = (insn & 0x0000f000) << 4; 3189 else if ((insn & 0xff00f000) == 0x5800c000) 3190 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */ 3191 ry = (insn & 0x000f0000); 3192 else if ((insn & 0xff0f0000) == 0x580c0000) 3193 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 3194 ry = (insn & 0x0000f000) << 4; 3195 else 3196 invalid_tls_insn (input_bfd, input_section, rel); 3197 insn = 0x18000700 | (insn & 0x00f00000) | ry; 3198 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3199 } 3200 } 3201 else if (r_type == R_390_TLS_GDCALL) 3202 { 3203 unsigned int insn; 3204 3205 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3206 if ((insn & 0xff000fff) != 0x4d000000 && 3207 (insn & 0xffff0000) != 0xc0e50000 && 3208 (insn & 0xff000000) != 0x0d000000) 3209 invalid_tls_insn (input_bfd, input_section, rel); 3210 if (!info->shared && (h == NULL || h->dynindx == -1)) 3211 { 3212 if ((insn & 0xff000000) == 0x0d000000) 3213 { 3214 /* GD->LE transition. 3215 basr rx, ry -> nopr r7 */ 3216 insn = 0x07070000 | (insn & 0xffff); 3217 } 3218 else if ((insn & 0xff000000) == 0x4d000000) 3219 { 3220 /* GD->LE transition. 3221 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3222 insn = 0x47000000; 3223 } 3224 else 3225 { 3226 /* GD->LE transition. 3227 brasl %r14,_tls_get_offset@plt -> brcl 0,. */ 3228 insn = 0xc0040000; 3229 bfd_put_16 (output_bfd, 0x0000, 3230 contents + rel->r_offset + 4); 3231 } 3232 } 3233 else 3234 { 3235 /* If basr is used in the pic case to invoke 3236 _tls_get_offset, something went wrong before. */ 3237 if ((insn & 0xff000000) == 0x0d000000) 3238 invalid_tls_insn (input_bfd, input_section, rel); 3239 3240 if ((insn & 0xff000000) == 0x4d000000) 3241 { 3242 /* GD->IE transition. 3243 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */ 3244 insn = 0x5822c000; 3245 } 3246 else 3247 { 3248 /* GD->IE transition. 3249 brasl %r14,__tls_get_addr@plt -> 3250 l %r2,0(%r2,%r12) ; bcr 0,0 */ 3251 insn = 0x5822c000; 3252 bfd_put_16 (output_bfd, 0x0700, 3253 contents + rel->r_offset + 4); 3254 } 3255 } 3256 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3257 } 3258 else if (r_type == R_390_TLS_LDCALL) 3259 { 3260 if (!info->shared) 3261 { 3262 unsigned int insn; 3263 3264 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3265 if ((insn & 0xff000fff) != 0x4d000000 && 3266 (insn & 0xffff0000) != 0xc0e50000 && 3267 (insn & 0xff000000) != 0x0d000000) 3268 invalid_tls_insn (input_bfd, input_section, rel); 3269 3270 if ((insn & 0xff000000) == 0x0d000000) 3271 { 3272 /* LD->LE transition. 3273 basr rx, ry -> nopr r7 */ 3274 insn = 0x07070000 | (insn & 0xffff); 3275 } 3276 else if ((insn & 0xff000000) == 0x4d000000) 3277 { 3278 /* LD->LE transition. 3279 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3280 insn = 0x47000000; 3281 } 3282 else 3283 { 3284 /* LD->LE transition. 3285 brasl %r14,__tls_get_offset@plt -> brcl 0,. */ 3286 insn = 0xc0040000; 3287 bfd_put_16 (output_bfd, 0x0000, 3288 contents + rel->r_offset + 4); 3289 } 3290 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3291 } 3292 } 3293 continue; 3294 3295 default: 3296 break; 3297 } 3298 3299 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3300 because such sections are not SEC_ALLOC and thus ld.so will 3301 not process them. */ 3302 if (unresolved_reloc 3303 && !((input_section->flags & SEC_DEBUGGING) != 0 3304 && h->def_dynamic) 3305 && _bfd_elf_section_offset (output_bfd, info, input_section, 3306 rel->r_offset) != (bfd_vma) -1) 3307 (*_bfd_error_handler) 3308 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3309 input_bfd, 3310 input_section, 3311 (long) rel->r_offset, 3312 howto->name, 3313 h->root.root.string); 3314 3315 do_relocation: 3316 3317 /* When applying a 24 bit reloc we need to start one byte 3318 earlier. Otherwise the 32 bit get/put bfd operations might 3319 access a byte after the actual section. */ 3320 if (r_type == R_390_PC24DBL 3321 || r_type == R_390_PLT24DBL) 3322 rel->r_offset--; 3323 3324 if (r_type == R_390_20 3325 || r_type == R_390_GOT20 3326 || r_type == R_390_GOTPLT20 3327 || r_type == R_390_TLS_GOTIE20) 3328 { 3329 relocation += rel->r_addend; 3330 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3331 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3332 contents, rel->r_offset, 3333 relocation, 0); 3334 } 3335 else 3336 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3337 contents, rel->r_offset, 3338 relocation, rel->r_addend); 3339 3340 if (r != bfd_reloc_ok) 3341 { 3342 const char *name; 3343 3344 if (h != NULL) 3345 name = h->root.root.string; 3346 else 3347 { 3348 name = bfd_elf_string_from_elf_section (input_bfd, 3349 symtab_hdr->sh_link, 3350 sym->st_name); 3351 if (name == NULL) 3352 return FALSE; 3353 if (*name == '\0') 3354 name = bfd_section_name (input_bfd, sec); 3355 } 3356 3357 if (r == bfd_reloc_overflow) 3358 { 3359 3360 if (! ((*info->callbacks->reloc_overflow) 3361 (info, (h ? &h->root : NULL), name, howto->name, 3362 (bfd_vma) 0, input_bfd, input_section, 3363 rel->r_offset))) 3364 return FALSE; 3365 } 3366 else 3367 { 3368 (*_bfd_error_handler) 3369 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3370 input_bfd, input_section, 3371 (long) rel->r_offset, name, (int) r); 3372 return FALSE; 3373 } 3374 } 3375 } 3376 3377 return TRUE; 3378 } 3379 3380 /* Generate the PLT slots together with the dynamic relocations needed 3381 for IFUNC symbols. */ 3382 3383 static void 3384 elf_s390_finish_ifunc_symbol (bfd *output_bfd, 3385 struct bfd_link_info *info, 3386 struct elf_link_hash_entry *h, 3387 struct elf_s390_link_hash_table *htab, 3388 bfd_vma iplt_offset, 3389 bfd_vma resolver_address) 3390 { 3391 bfd_vma iplt_index; 3392 bfd_vma got_offset; 3393 bfd_vma igotiplt_offset; 3394 Elf_Internal_Rela rela; 3395 bfd_byte *loc; 3396 asection *plt, *gotplt, *relplt; 3397 bfd_vma relative_offset; 3398 3399 if (htab->elf.iplt == NULL 3400 || htab->elf.igotplt == NULL 3401 || htab->elf.irelplt == NULL) 3402 abort (); 3403 3404 gotplt = htab->elf.igotplt; 3405 relplt = htab->elf.irelplt; 3406 3407 /* Index of the PLT slot within iplt section. */ 3408 iplt_index = iplt_offset / PLT_ENTRY_SIZE; 3409 plt = htab->elf.iplt; 3410 /* Offset into the igot.plt section. */ 3411 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE; 3412 /* Offset into the got section. */ 3413 got_offset = igotiplt_offset + gotplt->output_offset; 3414 3415 /* S390 uses halfwords for relative branch calc! */ 3416 relative_offset = - (plt->output_offset + 3417 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2; 3418 /* If offset is > 32768, branch to a previous branch 3419 390 can only handle +-64 K jumps. */ 3420 if ( -32768 > (int) relative_offset ) 3421 relative_offset 3422 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3423 3424 /* Fill in the entry in the procedure linkage table. */ 3425 if (!info->shared) 3426 { 3427 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry, 3428 PLT_ENTRY_SIZE); 3429 3430 /* Adjust jump to the first plt entry. */ 3431 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3432 plt->contents + iplt_offset + 20); 3433 3434 /* Push the GOT offset field. */ 3435 bfd_put_32 (output_bfd, 3436 (gotplt->output_section->vma 3437 + got_offset), 3438 plt->contents + iplt_offset + 24); 3439 } 3440 else if (got_offset < 4096) 3441 { 3442 /* The GOT offset is small enough to be used directly as 3443 displacement. */ 3444 memcpy (plt->contents + iplt_offset, 3445 elf_s390_plt_pic12_entry, 3446 PLT_ENTRY_SIZE); 3447 3448 /* Put in the GOT offset as displacement value. The 0xc000 3449 value comes from the first word of the plt entry. Look 3450 at the elf_s390_plt_pic16_entry content. */ 3451 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3452 plt->contents + iplt_offset + 2); 3453 3454 /* Adjust the jump to the first plt entry. */ 3455 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3456 plt->contents + iplt_offset + 20); 3457 } 3458 else if (got_offset < 32768) 3459 { 3460 /* The GOT offset is too big for a displacement but small 3461 enough to be a signed 16 bit immediate value as it can be 3462 used in an lhi instruction. */ 3463 memcpy (plt->contents + iplt_offset, 3464 elf_s390_plt_pic16_entry, 3465 PLT_ENTRY_SIZE); 3466 3467 /* Put in the GOT offset for the lhi instruction. */ 3468 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3469 plt->contents + iplt_offset + 2); 3470 3471 /* Adjust the jump to the first plt entry. */ 3472 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3473 plt->contents + iplt_offset + 20); 3474 } 3475 else 3476 { 3477 memcpy (plt->contents + iplt_offset, 3478 elf_s390_plt_pic_entry, 3479 PLT_ENTRY_SIZE); 3480 3481 /* Adjust the jump to the first plt entry. */ 3482 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3483 plt->contents + iplt_offset + 20); 3484 3485 /* Push the GOT offset field. */ 3486 bfd_put_32 (output_bfd, got_offset, 3487 plt->contents + iplt_offset + 24); 3488 } 3489 /* Insert offset into reloc. table here. */ 3490 bfd_put_32 (output_bfd, relplt->output_offset + 3491 iplt_index * RELA_ENTRY_SIZE, 3492 plt->contents + iplt_offset + 28); 3493 3494 /* Fill in the entry in the global offset table. 3495 Points to instruction after GOT offset. */ 3496 bfd_put_32 (output_bfd, 3497 (plt->output_section->vma 3498 + plt->output_offset 3499 + iplt_offset 3500 + 12), 3501 gotplt->contents + igotiplt_offset); 3502 3503 /* Fill in the entry in the .rela.plt section. */ 3504 rela.r_offset = gotplt->output_section->vma + got_offset; 3505 3506 if (!h 3507 || h->dynindx == -1 3508 || ((info->executable 3509 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3510 && h->def_regular)) 3511 { 3512 /* The symbol can be locally resolved. */ 3513 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 3514 rela.r_addend = resolver_address; 3515 } 3516 else 3517 { 3518 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3519 rela.r_addend = 0; 3520 } 3521 3522 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE; 3523 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3524 } 3525 3526 /* Finish up dynamic symbol handling. We set the contents of various 3527 dynamic sections here. */ 3528 3529 static bfd_boolean 3530 elf_s390_finish_dynamic_symbol (bfd *output_bfd, 3531 struct bfd_link_info *info, 3532 struct elf_link_hash_entry *h, 3533 Elf_Internal_Sym *sym) 3534 { 3535 struct elf_s390_link_hash_table *htab; 3536 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; 3537 3538 htab = elf_s390_hash_table (info); 3539 3540 if (h->plt.offset != (bfd_vma) -1) 3541 { 3542 bfd_vma plt_index; 3543 bfd_vma got_offset; 3544 Elf_Internal_Rela rela; 3545 bfd_byte *loc; 3546 bfd_vma relative_offset; 3547 3548 /* This symbol has an entry in the procedure linkage table. Set 3549 it up. */ 3550 if (s390_is_ifunc_symbol_p (h)) 3551 { 3552 /* If we can resolve the IFUNC symbol locally we generate an 3553 IRELATIVE reloc. */ 3554 elf_s390_finish_ifunc_symbol (output_bfd, info, h, htab, h->plt.offset, 3555 eh->ifunc_resolver_address + 3556 eh->ifunc_resolver_section->output_offset + 3557 eh->ifunc_resolver_section->output_section->vma); 3558 /* Fallthrough. Handling of explicit GOT slots of IFUNC 3559 symbols is below. */ 3560 } 3561 else 3562 { 3563 if (h->dynindx == -1 3564 || htab->elf.splt == NULL 3565 || htab->elf.sgotplt == NULL 3566 || htab->elf.srelplt == NULL) 3567 abort (); 3568 3569 /* Calc. index no. 3570 Current offset - size first entry / entry size. */ 3571 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3572 3573 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 3574 addr & GOT addr. */ 3575 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3576 3577 /* S390 uses halfwords for relative branch calc! */ 3578 relative_offset = - ((PLT_FIRST_ENTRY_SIZE + 3579 (PLT_ENTRY_SIZE * plt_index) + 18) / 2); 3580 /* If offset is > 32768, branch to a previous branch 3581 390 can only handle +-64 K jumps. */ 3582 if ( -32768 > (int) relative_offset ) 3583 relative_offset 3584 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3585 3586 /* Fill in the entry in the procedure linkage table. */ 3587 if (!info->shared) 3588 { 3589 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry, 3590 PLT_ENTRY_SIZE); 3591 3592 /* Adjust jump to the first plt entry. */ 3593 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3594 htab->elf.splt->contents + h->plt.offset + 20); 3595 3596 /* Push the GOT offset field. */ 3597 bfd_put_32 (output_bfd, 3598 (htab->elf.sgotplt->output_section->vma 3599 + htab->elf.sgotplt->output_offset 3600 + got_offset), 3601 htab->elf.splt->contents + h->plt.offset + 24); 3602 } 3603 else if (got_offset < 4096) 3604 { 3605 /* The GOT offset is small enough to be used directly as 3606 displacement. */ 3607 memcpy (htab->elf.splt->contents + h->plt.offset, 3608 elf_s390_plt_pic12_entry, 3609 PLT_ENTRY_SIZE); 3610 3611 /* Put in the GOT offset as displacement value. The 0xc000 3612 value comes from the first word of the plt entry. Look 3613 at the elf_s390_plt_pic16_entry content. */ 3614 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3615 htab->elf.splt->contents + h->plt.offset + 2); 3616 3617 /* Adjust the jump to the first plt entry. */ 3618 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3619 htab->elf.splt->contents + h->plt.offset + 20); 3620 } 3621 else if (got_offset < 32768) 3622 { 3623 /* The GOT offset is too big for a displacement but small 3624 enough to be a signed 16 bit immediate value as it can be 3625 used in an lhi instruction. */ 3626 memcpy (htab->elf.splt->contents + h->plt.offset, 3627 elf_s390_plt_pic16_entry, 3628 PLT_ENTRY_SIZE); 3629 3630 /* Put in the GOT offset for the lhi instruction. */ 3631 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3632 htab->elf.splt->contents + h->plt.offset + 2); 3633 3634 /* Adjust the jump to the first plt entry. */ 3635 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3636 htab->elf.splt->contents + h->plt.offset + 20); 3637 } 3638 else 3639 { 3640 memcpy (htab->elf.splt->contents + h->plt.offset, 3641 elf_s390_plt_pic_entry, 3642 PLT_ENTRY_SIZE); 3643 3644 /* Adjust the jump to the first plt entry. */ 3645 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3646 htab->elf.splt->contents + h->plt.offset + 20); 3647 3648 /* Push the GOT offset field. */ 3649 bfd_put_32 (output_bfd, got_offset, 3650 htab->elf.splt->contents + h->plt.offset + 24); 3651 } 3652 /* Insert offset into reloc. table here. */ 3653 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 3654 htab->elf.splt->contents + h->plt.offset + 28); 3655 3656 /* Fill in the entry in the global offset table. 3657 Points to instruction after GOT offset. */ 3658 bfd_put_32 (output_bfd, 3659 (htab->elf.splt->output_section->vma 3660 + htab->elf.splt->output_offset 3661 + h->plt.offset 3662 + 12), 3663 htab->elf.sgotplt->contents + got_offset); 3664 3665 /* Fill in the entry in the .rela.plt section. */ 3666 rela.r_offset = (htab->elf.sgotplt->output_section->vma 3667 + htab->elf.sgotplt->output_offset 3668 + got_offset); 3669 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3670 rela.r_addend = 0; 3671 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela); 3672 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3673 3674 if (!h->def_regular) 3675 { 3676 /* Mark the symbol as undefined, rather than as defined in 3677 the .plt section. Leave the value alone. This is a clue 3678 for the dynamic linker, to make function pointer 3679 comparisons work between an application and shared 3680 library. */ 3681 sym->st_shndx = SHN_UNDEF; 3682 } 3683 } 3684 } 3685 3686 if (h->got.offset != (bfd_vma) -1 3687 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3688 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3689 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3690 { 3691 Elf_Internal_Rela rela; 3692 bfd_byte *loc; 3693 3694 /* This symbol has an entry in the global offset table. Set it 3695 up. */ 3696 3697 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3698 abort (); 3699 3700 rela.r_offset = (htab->elf.sgot->output_section->vma 3701 + htab->elf.sgot->output_offset 3702 + (h->got.offset &~ (bfd_vma) 1)); 3703 3704 /* If this is a static link, or it is a -Bsymbolic link and the 3705 symbol is defined locally or was forced to be local because 3706 of a version file, we just want to emit a RELATIVE reloc. 3707 The entry in the global offset table will already have been 3708 initialized in the relocate_section function. */ 3709 if (h->def_regular && s390_is_ifunc_symbol_p (h)) 3710 { 3711 if (info->shared) 3712 { 3713 /* An explicit GOT slot usage needs GLOB_DAT. If the 3714 symbol references local the implicit got.iplt slot 3715 will be used and the IRELATIVE reloc has been created 3716 above. */ 3717 goto do_glob_dat; 3718 } 3719 else 3720 { 3721 /* For non-shared objects explicit GOT slots must be 3722 filled with the PLT slot address for pointer 3723 equality reasons. */ 3724 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma 3725 + htab->elf.iplt->output_offset 3726 + h->plt.offset), 3727 htab->elf.sgot->contents + h->got.offset); 3728 return TRUE; 3729 } 3730 } 3731 else if (info->shared 3732 && SYMBOL_REFERENCES_LOCAL (info, h)) 3733 { 3734 /* If this is a static link, or it is a -Bsymbolic link and 3735 the symbol is defined locally or was forced to be local 3736 because of a version file, we just want to emit a 3737 RELATIVE reloc. The entry in the global offset table 3738 will already have been initialized in the 3739 relocate_section function. */ 3740 if (!h->def_regular) 3741 return FALSE; 3742 BFD_ASSERT((h->got.offset & 1) != 0); 3743 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 3744 rela.r_addend = (h->root.u.def.value 3745 + h->root.u.def.section->output_section->vma 3746 + h->root.u.def.section->output_offset); 3747 } 3748 else 3749 { 3750 BFD_ASSERT((h->got.offset & 1) == 0); 3751 do_glob_dat: 3752 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset); 3753 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT); 3754 rela.r_addend = 0; 3755 } 3756 3757 loc = htab->elf.srelgot->contents; 3758 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3759 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3760 } 3761 3762 if (h->needs_copy) 3763 { 3764 Elf_Internal_Rela rela; 3765 bfd_byte *loc; 3766 3767 /* This symbols needs a copy reloc. Set it up. */ 3768 3769 if (h->dynindx == -1 3770 || (h->root.type != bfd_link_hash_defined 3771 && h->root.type != bfd_link_hash_defweak) 3772 || htab->srelbss == NULL) 3773 abort (); 3774 3775 rela.r_offset = (h->root.u.def.value 3776 + h->root.u.def.section->output_section->vma 3777 + h->root.u.def.section->output_offset); 3778 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY); 3779 rela.r_addend = 0; 3780 loc = htab->srelbss->contents; 3781 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela); 3782 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3783 } 3784 3785 /* Mark some specially defined symbols as absolute. */ 3786 if (h == htab->elf.hdynamic 3787 || h == htab->elf.hgot 3788 || h == htab->elf.hplt) 3789 sym->st_shndx = SHN_ABS; 3790 3791 return TRUE; 3792 } 3793 3794 /* Used to decide how to sort relocs in an optimal manner for the 3795 dynamic linker, before writing them out. */ 3796 3797 static enum elf_reloc_type_class 3798 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3799 const asection *rel_sec ATTRIBUTE_UNUSED, 3800 const Elf_Internal_Rela *rela) 3801 { 3802 switch ((int) ELF32_R_TYPE (rela->r_info)) 3803 { 3804 case R_390_RELATIVE: 3805 return reloc_class_relative; 3806 case R_390_JMP_SLOT: 3807 return reloc_class_plt; 3808 case R_390_COPY: 3809 return reloc_class_copy; 3810 default: 3811 return reloc_class_normal; 3812 } 3813 } 3814 3815 /* Finish up the dynamic sections. */ 3816 3817 static bfd_boolean 3818 elf_s390_finish_dynamic_sections (bfd *output_bfd, 3819 struct bfd_link_info *info) 3820 { 3821 struct elf_s390_link_hash_table *htab; 3822 bfd *dynobj; 3823 asection *sdyn; 3824 bfd *ibfd; 3825 unsigned int i; 3826 3827 htab = elf_s390_hash_table (info); 3828 dynobj = htab->elf.dynobj; 3829 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3830 3831 if (htab->elf.dynamic_sections_created) 3832 { 3833 Elf32_External_Dyn *dyncon, *dynconend; 3834 3835 if (sdyn == NULL || htab->elf.sgot == NULL) 3836 abort (); 3837 3838 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3839 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3840 for (; dyncon < dynconend; dyncon++) 3841 { 3842 Elf_Internal_Dyn dyn; 3843 asection *s; 3844 3845 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3846 3847 switch (dyn.d_tag) 3848 { 3849 default: 3850 continue; 3851 3852 case DT_PLTGOT: 3853 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma; 3854 break; 3855 3856 case DT_JMPREL: 3857 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; 3858 break; 3859 3860 case DT_PLTRELSZ: 3861 s = htab->elf.srelplt->output_section; 3862 dyn.d_un.d_val = s->size; 3863 break; 3864 } 3865 3866 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3867 } 3868 3869 /* Fill in the special first entry in the procedure linkage table. */ 3870 if (htab->elf.splt && htab->elf.splt->size > 0) 3871 { 3872 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE); 3873 if (info->shared) 3874 { 3875 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry, 3876 PLT_FIRST_ENTRY_SIZE); 3877 } 3878 else 3879 { 3880 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry, 3881 PLT_FIRST_ENTRY_SIZE); 3882 bfd_put_32 (output_bfd, 3883 htab->elf.sgotplt->output_section->vma 3884 + htab->elf.sgotplt->output_offset, 3885 htab->elf.splt->contents + 24); 3886 } 3887 elf_section_data (htab->elf.splt->output_section) 3888 ->this_hdr.sh_entsize = 4; 3889 } 3890 3891 } 3892 3893 if (htab->elf.sgotplt) 3894 { 3895 /* Fill in the first three entries in the global offset table. */ 3896 if (htab->elf.sgotplt->size > 0) 3897 { 3898 bfd_put_32 (output_bfd, 3899 (sdyn == NULL ? (bfd_vma) 0 3900 : sdyn->output_section->vma + sdyn->output_offset), 3901 htab->elf.sgotplt->contents); 3902 /* One entry for shared object struct ptr. */ 3903 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4); 3904 /* One entry for _dl_runtime_resolve. */ 3905 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8); 3906 } 3907 3908 elf_section_data (htab->elf.sgotplt->output_section) 3909 ->this_hdr.sh_entsize = 4; 3910 } 3911 /* Finish dynamic symbol for local IFUNC symbols. */ 3912 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 3913 { 3914 struct plt_entry *local_plt; 3915 Elf_Internal_Sym *isym; 3916 Elf_Internal_Shdr *symtab_hdr; 3917 3918 symtab_hdr = &elf_symtab_hdr (ibfd); 3919 3920 local_plt = elf_s390_local_plt (ibfd); 3921 if (local_plt != NULL) 3922 for (i = 0; i < symtab_hdr->sh_info; i++) 3923 { 3924 if (local_plt[i].plt.offset != (bfd_vma) -1) 3925 { 3926 asection *sec = local_plt[i].sec; 3927 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i); 3928 if (isym == NULL) 3929 return FALSE; 3930 3931 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 3932 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab, 3933 local_plt[i].plt.offset, 3934 isym->st_value 3935 + sec->output_section->vma 3936 + sec->output_offset); 3937 3938 } 3939 } 3940 } 3941 return TRUE; 3942 } 3943 3944 static bfd_boolean 3945 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note) 3946 { 3947 int offset; 3948 unsigned int size; 3949 3950 switch (note->descsz) 3951 { 3952 default: 3953 return FALSE; 3954 3955 case 224: /* S/390 Linux. */ 3956 /* pr_cursig */ 3957 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 3958 3959 /* pr_pid */ 3960 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 3961 3962 /* pr_reg */ 3963 offset = 72; 3964 size = 144; 3965 break; 3966 } 3967 3968 /* Make a ".reg/999" section. */ 3969 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3970 size, note->descpos + offset); 3971 } 3972 3973 /* Return address for Ith PLT stub in section PLT, for relocation REL 3974 or (bfd_vma) -1 if it should not be included. */ 3975 3976 static bfd_vma 3977 elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3978 const arelent *rel ATTRIBUTE_UNUSED) 3979 { 3980 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3981 } 3982 3983 static bfd_boolean 3984 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 3985 { 3986 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags; 3987 return TRUE; 3988 } 3989 3990 3991 #define TARGET_BIG_SYM s390_elf32_vec 3992 #define TARGET_BIG_NAME "elf32-s390" 3993 #define ELF_ARCH bfd_arch_s390 3994 #define ELF_TARGET_ID S390_ELF_DATA 3995 #define ELF_MACHINE_CODE EM_S390 3996 #define ELF_MACHINE_ALT1 EM_S390_OLD 3997 #define ELF_MAXPAGESIZE 0x1000 3998 3999 #define elf_backend_can_gc_sections 1 4000 #define elf_backend_can_refcount 1 4001 #define elf_backend_want_got_plt 1 4002 #define elf_backend_plt_readonly 1 4003 #define elf_backend_want_plt_sym 0 4004 #define elf_backend_got_header_size 12 4005 #define elf_backend_rela_normal 1 4006 4007 #define elf_info_to_howto elf_s390_info_to_howto 4008 4009 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name 4010 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create 4011 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 4012 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 4013 4014 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data 4015 4016 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 4017 #define elf_backend_check_relocs elf_s390_check_relocs 4018 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 4019 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 4020 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 4021 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 4022 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 4023 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 4024 #define elf_backend_reloc_type_class elf_s390_reloc_type_class 4025 #define elf_backend_relocate_section elf_s390_relocate_section 4026 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 4027 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4028 #define elf_backend_grok_prstatus elf_s390_grok_prstatus 4029 #define elf_backend_plt_sym_val elf_s390_plt_sym_val 4030 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook 4031 4032 #define bfd_elf32_mkobject elf_s390_mkobject 4033 #define elf_backend_object_p elf_s390_object_p 4034 4035 #include "elf32-target.h" 4036
