1 /* IBM S/390-specific support for 32-bit ELF 2 Copyright (C) 2000-2019 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 #include <stdarg.h> 29 30 static bfd_reloc_status_type 31 s390_tls_reloc (bfd *, arelent *, asymbol *, void *, 32 asection *, bfd *, char **); 33 static bfd_reloc_status_type 34 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *, 35 asection *, bfd *, char **); 36 37 /* The relocation "howto" table. */ 38 39 static reloc_howto_type elf_howto_table[] = 40 { 41 HOWTO (R_390_NONE, /* type */ 42 0, /* rightshift */ 43 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */ 44 0, /* bitsize */ 45 FALSE, /* pc_relative */ 46 0, /* bitpos */ 47 complain_overflow_dont, /* complain_on_overflow */ 48 bfd_elf_generic_reloc, /* special_function */ 49 "R_390_NONE", /* name */ 50 FALSE, /* partial_inplace */ 51 0, /* src_mask */ 52 0, /* dst_mask */ 53 FALSE), /* pcrel_offset */ 54 55 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 56 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 57 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 58 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 59 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 61 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 62 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 63 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 64 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 65 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 66 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 67 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 68 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 69 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 70 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 71 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 72 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE), 73 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 74 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE), 75 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 76 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE), 77 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 78 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE), 79 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 80 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE), 81 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 82 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE), 83 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 84 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 85 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 87 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 88 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 89 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 90 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 91 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 93 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 94 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 95 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 96 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE), 97 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */ 98 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */ 99 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */ 100 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */ 101 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 102 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE), 103 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 104 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 105 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */ 106 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 107 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 108 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 109 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 110 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 111 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 112 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */ 113 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 114 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE), 115 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 116 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 117 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 118 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 119 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */ 120 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 121 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 122 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 123 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 124 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 125 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 126 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE), 128 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */ 129 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 130 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 131 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 132 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE), 133 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */ 134 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 135 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE), 136 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */ 137 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 138 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE), 139 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */ 140 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 141 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE), 142 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 143 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE), 144 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */ 145 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 146 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE), 147 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */ 148 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 149 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE), 150 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 151 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE), 152 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 153 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE), 154 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 155 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 156 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 157 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 158 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 159 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 160 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 161 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 162 HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 163 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE), 164 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 165 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE), 166 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 167 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE), 168 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 169 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE), 170 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 171 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE), 172 }; 173 174 /* GNU extension to record C++ vtable hierarchy. */ 175 static reloc_howto_type elf32_s390_vtinherit_howto = 176 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 177 static reloc_howto_type elf32_s390_vtentry_howto = 178 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); 179 180 static reloc_howto_type * 181 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 182 bfd_reloc_code_real_type code) 183 { 184 switch (code) 185 { 186 case BFD_RELOC_NONE: 187 return &elf_howto_table[(int) R_390_NONE]; 188 case BFD_RELOC_8: 189 return &elf_howto_table[(int) R_390_8]; 190 case BFD_RELOC_390_12: 191 return &elf_howto_table[(int) R_390_12]; 192 case BFD_RELOC_16: 193 return &elf_howto_table[(int) R_390_16]; 194 case BFD_RELOC_32: 195 return &elf_howto_table[(int) R_390_32]; 196 case BFD_RELOC_CTOR: 197 return &elf_howto_table[(int) R_390_32]; 198 case BFD_RELOC_32_PCREL: 199 return &elf_howto_table[(int) R_390_PC32]; 200 case BFD_RELOC_390_GOT12: 201 return &elf_howto_table[(int) R_390_GOT12]; 202 case BFD_RELOC_32_GOT_PCREL: 203 return &elf_howto_table[(int) R_390_GOT32]; 204 case BFD_RELOC_390_PLT32: 205 return &elf_howto_table[(int) R_390_PLT32]; 206 case BFD_RELOC_390_COPY: 207 return &elf_howto_table[(int) R_390_COPY]; 208 case BFD_RELOC_390_GLOB_DAT: 209 return &elf_howto_table[(int) R_390_GLOB_DAT]; 210 case BFD_RELOC_390_JMP_SLOT: 211 return &elf_howto_table[(int) R_390_JMP_SLOT]; 212 case BFD_RELOC_390_RELATIVE: 213 return &elf_howto_table[(int) R_390_RELATIVE]; 214 case BFD_RELOC_32_GOTOFF: 215 return &elf_howto_table[(int) R_390_GOTOFF32]; 216 case BFD_RELOC_390_GOTPC: 217 return &elf_howto_table[(int) R_390_GOTPC]; 218 case BFD_RELOC_390_GOT16: 219 return &elf_howto_table[(int) R_390_GOT16]; 220 case BFD_RELOC_16_PCREL: 221 return &elf_howto_table[(int) R_390_PC16]; 222 case BFD_RELOC_390_PC12DBL: 223 return &elf_howto_table[(int) R_390_PC12DBL]; 224 case BFD_RELOC_390_PLT12DBL: 225 return &elf_howto_table[(int) R_390_PLT12DBL]; 226 case BFD_RELOC_390_PC16DBL: 227 return &elf_howto_table[(int) R_390_PC16DBL]; 228 case BFD_RELOC_390_PLT16DBL: 229 return &elf_howto_table[(int) R_390_PLT16DBL]; 230 case BFD_RELOC_390_PC24DBL: 231 return &elf_howto_table[(int) R_390_PC24DBL]; 232 case BFD_RELOC_390_PLT24DBL: 233 return &elf_howto_table[(int) R_390_PLT24DBL]; 234 case BFD_RELOC_390_PC32DBL: 235 return &elf_howto_table[(int) R_390_PC32DBL]; 236 case BFD_RELOC_390_PLT32DBL: 237 return &elf_howto_table[(int) R_390_PLT32DBL]; 238 case BFD_RELOC_390_GOTPCDBL: 239 return &elf_howto_table[(int) R_390_GOTPCDBL]; 240 case BFD_RELOC_390_GOTENT: 241 return &elf_howto_table[(int) R_390_GOTENT]; 242 case BFD_RELOC_16_GOTOFF: 243 return &elf_howto_table[(int) R_390_GOTOFF16]; 244 case BFD_RELOC_390_GOTPLT12: 245 return &elf_howto_table[(int) R_390_GOTPLT12]; 246 case BFD_RELOC_390_GOTPLT16: 247 return &elf_howto_table[(int) R_390_GOTPLT16]; 248 case BFD_RELOC_390_GOTPLT32: 249 return &elf_howto_table[(int) R_390_GOTPLT32]; 250 case BFD_RELOC_390_GOTPLTENT: 251 return &elf_howto_table[(int) R_390_GOTPLTENT]; 252 case BFD_RELOC_390_PLTOFF16: 253 return &elf_howto_table[(int) R_390_PLTOFF16]; 254 case BFD_RELOC_390_PLTOFF32: 255 return &elf_howto_table[(int) R_390_PLTOFF32]; 256 case BFD_RELOC_390_TLS_LOAD: 257 return &elf_howto_table[(int) R_390_TLS_LOAD]; 258 case BFD_RELOC_390_TLS_GDCALL: 259 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 260 case BFD_RELOC_390_TLS_LDCALL: 261 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 262 case BFD_RELOC_390_TLS_GD32: 263 return &elf_howto_table[(int) R_390_TLS_GD32]; 264 case BFD_RELOC_390_TLS_GOTIE12: 265 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 266 case BFD_RELOC_390_TLS_GOTIE32: 267 return &elf_howto_table[(int) R_390_TLS_GOTIE32]; 268 case BFD_RELOC_390_TLS_LDM32: 269 return &elf_howto_table[(int) R_390_TLS_LDM32]; 270 case BFD_RELOC_390_TLS_IE32: 271 return &elf_howto_table[(int) R_390_TLS_IE32]; 272 case BFD_RELOC_390_TLS_IEENT: 273 return &elf_howto_table[(int) R_390_TLS_IEENT]; 274 case BFD_RELOC_390_TLS_LE32: 275 return &elf_howto_table[(int) R_390_TLS_LE32]; 276 case BFD_RELOC_390_TLS_LDO32: 277 return &elf_howto_table[(int) R_390_TLS_LDO32]; 278 case BFD_RELOC_390_TLS_DTPMOD: 279 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 280 case BFD_RELOC_390_TLS_DTPOFF: 281 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 282 case BFD_RELOC_390_TLS_TPOFF: 283 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 284 case BFD_RELOC_390_20: 285 return &elf_howto_table[(int) R_390_20]; 286 case BFD_RELOC_390_GOT20: 287 return &elf_howto_table[(int) R_390_GOT20]; 288 case BFD_RELOC_390_GOTPLT20: 289 return &elf_howto_table[(int) R_390_GOTPLT20]; 290 case BFD_RELOC_390_TLS_GOTIE20: 291 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 292 case BFD_RELOC_390_IRELATIVE: 293 return &elf_howto_table[(int) R_390_IRELATIVE]; 294 case BFD_RELOC_VTABLE_INHERIT: 295 return &elf32_s390_vtinherit_howto; 296 case BFD_RELOC_VTABLE_ENTRY: 297 return &elf32_s390_vtentry_howto; 298 default: 299 break; 300 } 301 return 0; 302 } 303 304 static reloc_howto_type * 305 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 306 const char *r_name) 307 { 308 unsigned int i; 309 310 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 311 if (elf_howto_table[i].name != NULL 312 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 313 return &elf_howto_table[i]; 314 315 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0) 316 return &elf32_s390_vtinherit_howto; 317 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0) 318 return &elf32_s390_vtentry_howto; 319 320 return NULL; 321 } 322 323 /* We need to use ELF32_R_TYPE so we have our own copy of this function, 324 and elf32-s390.c has its own copy. */ 325 326 static bfd_boolean 327 elf_s390_info_to_howto (bfd *abfd, 328 arelent *cache_ptr, 329 Elf_Internal_Rela *dst) 330 { 331 unsigned int r_type = ELF32_R_TYPE(dst->r_info); 332 333 switch (r_type) 334 { 335 case R_390_GNU_VTINHERIT: 336 cache_ptr->howto = &elf32_s390_vtinherit_howto; 337 break; 338 339 case R_390_GNU_VTENTRY: 340 cache_ptr->howto = &elf32_s390_vtentry_howto; 341 break; 342 343 default: 344 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 345 { 346 /* xgettext:c-format */ 347 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 348 abfd, r_type); 349 bfd_set_error (bfd_error_bad_value); 350 return FALSE; 351 } 352 cache_ptr->howto = &elf_howto_table[r_type]; 353 } 354 355 return TRUE; 356 } 357 358 /* A relocation function which doesn't do anything. */ 359 static bfd_reloc_status_type 360 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED, 361 arelent *reloc_entry, 362 asymbol *symbol ATTRIBUTE_UNUSED, 363 void * data ATTRIBUTE_UNUSED, 364 asection *input_section, 365 bfd *output_bfd, 366 char **error_message ATTRIBUTE_UNUSED) 367 { 368 if (output_bfd) 369 reloc_entry->address += input_section->output_offset; 370 return bfd_reloc_ok; 371 } 372 373 /* Handle the large displacement relocs. */ 374 static bfd_reloc_status_type 375 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED, 376 arelent *reloc_entry, 377 asymbol *symbol, 378 void * data ATTRIBUTE_UNUSED, 379 asection *input_section, 380 bfd *output_bfd, 381 char **error_message ATTRIBUTE_UNUSED) 382 { 383 reloc_howto_type *howto = reloc_entry->howto; 384 bfd_vma relocation; 385 bfd_vma insn; 386 387 if (output_bfd != (bfd *) NULL 388 && (symbol->flags & BSF_SECTION_SYM) == 0 389 && (! howto->partial_inplace 390 || reloc_entry->addend == 0)) 391 { 392 reloc_entry->address += input_section->output_offset; 393 return bfd_reloc_ok; 394 } 395 396 if (output_bfd != NULL) 397 return bfd_reloc_continue; 398 399 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 400 return bfd_reloc_outofrange; 401 402 relocation = (symbol->value 403 + symbol->section->output_section->vma 404 + symbol->section->output_offset); 405 relocation += reloc_entry->addend; 406 if (howto->pc_relative) 407 { 408 relocation -= (input_section->output_section->vma 409 + input_section->output_offset); 410 relocation -= reloc_entry->address; 411 } 412 413 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 414 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 415 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 416 417 if ((bfd_signed_vma) relocation < - 0x80000 418 || (bfd_signed_vma) relocation > 0x7ffff) 419 return bfd_reloc_overflow; 420 else 421 return bfd_reloc_ok; 422 } 423 424 static bfd_boolean 425 elf_s390_is_local_label_name (bfd *abfd, const char *name) 426 { 427 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 428 return TRUE; 429 430 return _bfd_elf_is_local_label_name (abfd, name); 431 } 432 433 /* Functions for the 390 ELF linker. */ 434 435 /* The name of the dynamic interpreter. This is put in the .interp 436 section. */ 437 438 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 439 440 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 441 copying dynamic variables from a shared lib into an app's dynbss 442 section, and instead use a dynamic relocation to point into the 443 shared lib. */ 444 #define ELIMINATE_COPY_RELOCS 1 445 446 /* The size in bytes of the first entry in the procedure linkage table. */ 447 #define PLT_FIRST_ENTRY_SIZE 32 448 /* The size in bytes of an entry in the procedure linkage table. */ 449 #define PLT_ENTRY_SIZE 32 450 451 #define GOT_ENTRY_SIZE 4 452 453 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela) 454 455 /* The first three entries in a procedure linkage table are reserved, 456 and the initial contents are unimportant (we zero them out). 457 Subsequent entries look like this. See the SVR4 ABI 386 458 supplement to see how this works. */ 459 460 /* For the s390, simple addr offset can only be 0 - 4096. 461 To use the full 2 GB address space, several instructions 462 are needed to load an address in a register and execute 463 a branch( or just saving the address) 464 465 Furthermore, only r 0 and 1 are free to use!!! */ 466 467 /* The first 3 words in the GOT are then reserved. 468 Word 0 is the address of the dynamic table. 469 Word 1 is a pointer to a structure describing the object 470 Word 2 is used to point to the loader entry address. 471 472 The code for position independent PLT entries looks like this: 473 474 r12 holds addr of the current GOT at entry to the PLT 475 476 The GOT holds the address in the PLT to be executed. 477 The loader then gets: 478 24(15) = Pointer to the structure describing the object. 479 28(15) = Offset into rela.plt 480 481 The loader must then find the module where the function is 482 and insert the address in the GOT. 483 484 Note: 390 can only address +- 64 K relative. 485 We check if offset > 65536, then make a relative branch -64xxx 486 back to a previous defined branch 487 488 PLT1: BASR 1,0 # 2 bytes 489 L 1,22(1) # 4 bytes Load offset in GOT in r 1 490 L 1,(1,12) # 4 bytes Load address from GOT in r1 491 BCR 15,1 # 2 bytes Jump to address 492 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 493 L 1,14(1) # 4 bytes Load offset in symol table in r1 494 BRC 15,-x # 4 bytes Jump to start of PLT 495 .word 0 # 2 bytes filler 496 .long ? # 4 bytes offset in GOT 497 .long ? # 4 bytes offset into rela.plt 498 499 This was the general case. There are two additional, optimizes PLT 500 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768. 501 First the one for GOT offsets < 4096: 502 503 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1 504 BCR 15,1 # 2 bytes Jump to address 505 .word 0,0,0 # 6 bytes filler 506 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 507 L 1,14(1) # 4 bytes Load offset in rela.plt in r1 508 BRC 15,-x # 4 bytes Jump to start of PLT 509 .word 0,0,0 # 6 bytes filler 510 .long ? # 4 bytes offset into rela.plt 511 512 Second the one for GOT offsets < 32768: 513 514 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1 515 L 1,(1,12) # 4 bytes Load address from GOT to r1 516 BCR 15,1 # 2 bytes Jump to address 517 .word 0 # 2 bytes filler 518 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 519 L 1,14(1) # 4 bytes Load offset in rela.plt in r1 520 BRC 15,-x # 4 bytes Jump to start of PLT 521 .word 0,0,0 # 6 bytes filler 522 .long ? # 4 bytes offset into rela.plt 523 524 Total = 32 bytes per PLT entry 525 526 The code for static build PLT entries looks like this: 527 528 PLT1: BASR 1,0 # 2 bytes 529 L 1,22(1) # 4 bytes Load address of GOT entry 530 L 1,0(0,1) # 4 bytes Load address from GOT in r1 531 BCR 15,1 # 2 bytes Jump to address 532 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 533 L 1,14(1) # 4 bytes Load offset in symbol table in r1 534 BRC 15,-x # 4 bytes Jump to start of PLT 535 .word 0 # 2 bytes filler 536 .long ? # 4 bytes address of GOT entry 537 .long ? # 4 bytes offset into rela.plt */ 538 539 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] = 540 { 541 0x0d, 0x10, /* basr %r1,%r0 */ 542 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */ 543 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */ 544 0x07, 0xf1, /* br %r1 */ 545 0x0d, 0x10, /* basr %r1,%r0 */ 546 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 547 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 548 0x00, 0x00, /* padding */ 549 0x00, 0x00, 0x00, 0x00, /* GOT offset */ 550 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */ 551 }; 552 553 /* Generic PLT pic entry. */ 554 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] = 555 { 556 0x0d, 0x10, /* basr %r1,%r0 */ 557 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */ 558 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */ 559 0x07, 0xf1, /* br %r1 */ 560 0x0d, 0x10, /* basr %r1,%r0 */ 561 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 562 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 563 0x00, 0x00, /* padding */ 564 0x00, 0x00, 0x00, 0x00, /* GOT offset */ 565 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */ 566 }; 567 568 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced 569 when generating the PLT slot with the GOT offset. */ 570 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] = 571 { 572 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */ 573 0x07, 0xf1, /* br %r1 */ 574 0x00, 0x00, 0x00, 0x00, /* padding */ 575 0x00, 0x00, 576 0x0d, 0x10, /* basr %r1,%r0 */ 577 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 578 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 579 0x00, 0x00, 0x00, 0x00, 580 0x00, 0x00, 0x00, 0x00 581 }; 582 583 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced 584 when generating the PLT slot with the GOT offset. */ 585 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] = 586 { 587 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */ 588 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */ 589 0x07, 0xf1, /* br %r1 */ 590 0x00, 0x00, 591 0x0d, 0x10, /* basr %r1,%r0 */ 592 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 593 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 594 0x00, 0x00, 0x00, 0x00, 595 0x00, 0x00, 0x00, 0x00, 596 0x00, 0x00 597 }; 598 599 /* The first PLT entry pushes the offset into the rela.plt 600 from R1 onto the stack at 8(15) and the loader object info 601 at 12(15), loads the loader address in R1 and jumps to it. */ 602 603 /* The first entry in the PLT for PIC code: 604 605 PLT0: 606 ST 1,28(15) # R1 has offset into rela.plt 607 L 1,4(12) # Get loader ino(object struct address) 608 ST 1,24(15) # Store address 609 L 1,8(12) # Entry address of loader in R1 610 BR 1 # Jump to loader 611 612 The first entry in the PLT for static code: 613 614 PLT0: 615 ST 1,28(15) # R1 has offset into rela.plt 616 BASR 1,0 617 L 1,18(0,1) # Get address of GOT 618 MVC 24(4,15),4(1) # Move loader ino to stack 619 L 1,8(1) # Get address of loader 620 BR 1 # Jump to loader 621 .word 0 # filler 622 .long got # address of GOT */ 623 624 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] = 625 { 626 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */ 627 0x0d, 0x10, /* basr %r1,%r0 */ 628 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */ 629 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */ 630 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */ 631 0x07, 0xf1, /* br %r1 */ 632 0x00, 0x00, 0x00, 0x00, 633 0x00, 0x00, 0x00, 0x00, 634 0x00, 0x00 635 }; 636 637 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] = 638 { 639 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */ 640 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */ 641 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */ 642 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */ 643 0x07, 0xf1, /* br %r1 */ 644 0x00, 0x00, 0x00, 0x00, 645 0x00, 0x00, 0x00, 0x00, 646 0x00, 0x00, 0x00, 0x00, 647 0x00, 0x00 648 }; 649 650 651 /* s390 ELF linker hash entry. */ 652 653 struct elf_s390_link_hash_entry 654 { 655 struct elf_link_hash_entry elf; 656 657 /* Track dynamic relocs copied for this symbol. */ 658 struct elf_dyn_relocs *dyn_relocs; 659 660 /* Number of GOTPLT references for a function. */ 661 bfd_signed_vma gotplt_refcount; 662 663 #define GOT_UNKNOWN 0 664 #define GOT_NORMAL 1 665 #define GOT_TLS_GD 2 666 #define GOT_TLS_IE 3 667 #define GOT_TLS_IE_NLT 4 668 unsigned char tls_type; 669 670 /* For pointer equality reasons we might need to change the symbol 671 type from STT_GNU_IFUNC to STT_FUNC together with its value and 672 section entry. So after alloc_dynrelocs only these values should 673 be used. In order to check whether a symbol is IFUNC use 674 s390_is_ifunc_symbol_p. */ 675 bfd_vma ifunc_resolver_address; 676 asection *ifunc_resolver_section; 677 }; 678 679 #define elf_s390_hash_entry(ent) \ 680 ((struct elf_s390_link_hash_entry *)(ent)) 681 682 /* This structure represents an entry in the local PLT list needed for 683 local IFUNC symbols. */ 684 struct plt_entry 685 { 686 /* The section of the local symbol. 687 Set in relocate_section and used in finish_dynamic_sections. */ 688 asection *sec; 689 690 union 691 { 692 bfd_signed_vma refcount; 693 bfd_vma offset; 694 } plt; 695 }; 696 697 /* NOTE: Keep this structure in sync with 698 the one declared in elf64-s390.c. */ 699 struct elf_s390_obj_tdata 700 { 701 struct elf_obj_tdata root; 702 703 /* A local PLT is needed for ifunc symbols. */ 704 struct plt_entry *local_plt; 705 706 /* TLS type for each local got entry. */ 707 char *local_got_tls_type; 708 }; 709 710 #define elf_s390_tdata(abfd) \ 711 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 712 713 #define elf_s390_local_plt(abfd) \ 714 (elf_s390_tdata (abfd)->local_plt) 715 716 #define elf_s390_local_got_tls_type(abfd) \ 717 (elf_s390_tdata (abfd)->local_got_tls_type) 718 719 #define is_s390_elf(bfd) \ 720 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 721 && elf_tdata (bfd) != NULL \ 722 && elf_object_id (bfd) == S390_ELF_DATA) 723 724 static bfd_boolean 725 elf_s390_mkobject (bfd *abfd) 726 { 727 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata), 728 S390_ELF_DATA); 729 } 730 731 static bfd_boolean 732 elf_s390_object_p (bfd *abfd) 733 { 734 /* Set the right machine number for an s390 elf32 file. */ 735 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31); 736 } 737 738 /* s390 ELF linker hash table. */ 739 740 struct elf_s390_link_hash_table 741 { 742 struct elf_link_hash_table elf; 743 744 /* Short-cuts to get to dynamic linker sections. */ 745 asection *irelifunc; 746 747 union 748 { 749 bfd_signed_vma refcount; 750 bfd_vma offset; 751 } tls_ldm_got; 752 753 /* Small local sym cache. */ 754 struct sym_cache sym_cache; 755 }; 756 757 /* Get the s390 ELF linker hash table from a link_info structure. */ 758 759 #define elf_s390_hash_table(p) \ 760 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 761 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL) 762 763 #undef ELF64 764 #include "elf-s390-common.c" 765 766 /* Create an entry in an s390 ELF linker hash table. */ 767 768 static struct bfd_hash_entry * 769 link_hash_newfunc (struct bfd_hash_entry *entry, 770 struct bfd_hash_table *table, 771 const char *string) 772 { 773 /* Allocate the structure if it has not already been allocated by a 774 subclass. */ 775 if (entry == NULL) 776 { 777 entry = bfd_hash_allocate (table, 778 sizeof (struct elf_s390_link_hash_entry)); 779 if (entry == NULL) 780 return entry; 781 } 782 783 /* Call the allocation method of the superclass. */ 784 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 785 if (entry != NULL) 786 { 787 struct elf_s390_link_hash_entry *eh; 788 789 eh = (struct elf_s390_link_hash_entry *) entry; 790 eh->dyn_relocs = NULL; 791 eh->gotplt_refcount = 0; 792 eh->tls_type = GOT_UNKNOWN; 793 eh->ifunc_resolver_address = 0; 794 eh->ifunc_resolver_section = NULL; 795 } 796 797 return entry; 798 } 799 800 /* Create an s390 ELF linker hash table. */ 801 802 static struct bfd_link_hash_table * 803 elf_s390_link_hash_table_create (bfd *abfd) 804 { 805 struct elf_s390_link_hash_table *ret; 806 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 807 808 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt); 809 if (ret == NULL) 810 return NULL; 811 812 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 813 sizeof (struct elf_s390_link_hash_entry), 814 S390_ELF_DATA)) 815 { 816 free (ret); 817 return NULL; 818 } 819 820 return &ret->elf.root; 821 } 822 823 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 824 825 static void 826 elf_s390_copy_indirect_symbol (struct bfd_link_info *info, 827 struct elf_link_hash_entry *dir, 828 struct elf_link_hash_entry *ind) 829 { 830 struct elf_s390_link_hash_entry *edir, *eind; 831 832 edir = (struct elf_s390_link_hash_entry *) dir; 833 eind = (struct elf_s390_link_hash_entry *) ind; 834 835 if (eind->dyn_relocs != NULL) 836 { 837 if (edir->dyn_relocs != NULL) 838 { 839 struct elf_dyn_relocs **pp; 840 struct elf_dyn_relocs *p; 841 842 /* Add reloc counts against the indirect sym to the direct sym 843 list. Merge any entries against the same section. */ 844 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 845 { 846 struct elf_dyn_relocs *q; 847 848 for (q = edir->dyn_relocs; q != NULL; q = q->next) 849 if (q->sec == p->sec) 850 { 851 q->pc_count += p->pc_count; 852 q->count += p->count; 853 *pp = p->next; 854 break; 855 } 856 if (q == NULL) 857 pp = &p->next; 858 } 859 *pp = edir->dyn_relocs; 860 } 861 862 edir->dyn_relocs = eind->dyn_relocs; 863 eind->dyn_relocs = NULL; 864 } 865 866 if (ind->root.type == bfd_link_hash_indirect 867 && dir->got.refcount <= 0) 868 { 869 edir->tls_type = eind->tls_type; 870 eind->tls_type = GOT_UNKNOWN; 871 } 872 873 if (ELIMINATE_COPY_RELOCS 874 && ind->root.type != bfd_link_hash_indirect 875 && dir->dynamic_adjusted) 876 { 877 /* If called to transfer flags for a weakdef during processing 878 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 879 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 880 if (dir->versioned != versioned_hidden) 881 dir->ref_dynamic |= ind->ref_dynamic; 882 dir->ref_regular |= ind->ref_regular; 883 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 884 dir->needs_plt |= ind->needs_plt; 885 } 886 else 887 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 888 } 889 890 static int 891 elf_s390_tls_transition (struct bfd_link_info *info, 892 int r_type, 893 int is_local) 894 { 895 if (bfd_link_pic (info)) 896 return r_type; 897 898 switch (r_type) 899 { 900 case R_390_TLS_GD32: 901 case R_390_TLS_IE32: 902 if (is_local) 903 return R_390_TLS_LE32; 904 return R_390_TLS_IE32; 905 case R_390_TLS_GOTIE32: 906 if (is_local) 907 return R_390_TLS_LE32; 908 return R_390_TLS_GOTIE32; 909 case R_390_TLS_LDM32: 910 return R_390_TLS_LE32; 911 } 912 913 return r_type; 914 } 915 916 /* Look through the relocs for a section during the first phase, and 917 allocate space in the global offset table or procedure linkage 918 table. */ 919 920 static bfd_boolean 921 elf_s390_check_relocs (bfd *abfd, 922 struct bfd_link_info *info, 923 asection *sec, 924 const Elf_Internal_Rela *relocs) 925 { 926 struct elf_s390_link_hash_table *htab; 927 Elf_Internal_Shdr *symtab_hdr; 928 struct elf_link_hash_entry **sym_hashes; 929 const Elf_Internal_Rela *rel; 930 const Elf_Internal_Rela *rel_end; 931 asection *sreloc; 932 bfd_signed_vma *local_got_refcounts; 933 int tls_type, old_tls_type; 934 Elf_Internal_Sym *isym; 935 936 if (bfd_link_relocatable (info)) 937 return TRUE; 938 939 BFD_ASSERT (is_s390_elf (abfd)); 940 941 htab = elf_s390_hash_table (info); 942 symtab_hdr = &elf_symtab_hdr (abfd); 943 sym_hashes = elf_sym_hashes (abfd); 944 local_got_refcounts = elf_local_got_refcounts (abfd); 945 946 sreloc = NULL; 947 948 rel_end = relocs + sec->reloc_count; 949 for (rel = relocs; rel < rel_end; rel++) 950 { 951 unsigned int r_type; 952 unsigned int r_symndx; 953 struct elf_link_hash_entry *h; 954 955 r_symndx = ELF32_R_SYM (rel->r_info); 956 957 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 958 { 959 /* xgettext:c-format */ 960 _bfd_error_handler (_("%pB: bad symbol index: %d"), 961 abfd, r_symndx); 962 return FALSE; 963 } 964 965 if (r_symndx < symtab_hdr->sh_info) 966 { 967 /* A local symbol. */ 968 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 969 abfd, r_symndx); 970 if (isym == NULL) 971 return FALSE; 972 973 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 974 { 975 struct plt_entry *plt; 976 977 if (htab->elf.dynobj == NULL) 978 htab->elf.dynobj = abfd; 979 980 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 981 return FALSE; 982 983 if (local_got_refcounts == NULL) 984 { 985 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 986 return FALSE; 987 local_got_refcounts = elf_local_got_refcounts (abfd); 988 } 989 plt = elf_s390_local_plt (abfd); 990 plt[r_symndx].plt.refcount++; 991 } 992 h = NULL; 993 } 994 else 995 { 996 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 997 while (h->root.type == bfd_link_hash_indirect 998 || h->root.type == bfd_link_hash_warning) 999 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1000 } 1001 1002 /* Create got section and local_got_refcounts array if they 1003 are needed. */ 1004 r_type = elf_s390_tls_transition (info, 1005 ELF32_R_TYPE (rel->r_info), 1006 h == NULL); 1007 switch (r_type) 1008 { 1009 case R_390_GOT12: 1010 case R_390_GOT16: 1011 case R_390_GOT20: 1012 case R_390_GOT32: 1013 case R_390_GOTENT: 1014 case R_390_GOTPLT12: 1015 case R_390_GOTPLT16: 1016 case R_390_GOTPLT20: 1017 case R_390_GOTPLT32: 1018 case R_390_GOTPLTENT: 1019 case R_390_TLS_GD32: 1020 case R_390_TLS_GOTIE12: 1021 case R_390_TLS_GOTIE20: 1022 case R_390_TLS_GOTIE32: 1023 case R_390_TLS_IEENT: 1024 case R_390_TLS_IE32: 1025 case R_390_TLS_LDM32: 1026 if (h == NULL 1027 && 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 /* Fall through. */ 1034 case R_390_GOTOFF16: 1035 case R_390_GOTOFF32: 1036 case R_390_GOTPC: 1037 case R_390_GOTPCDBL: 1038 if (htab->elf.sgot == NULL) 1039 { 1040 if (htab->elf.dynobj == NULL) 1041 htab->elf.dynobj = abfd; 1042 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) 1043 return FALSE; 1044 } 1045 } 1046 1047 if (h != NULL) 1048 { 1049 if (htab->elf.dynobj == NULL) 1050 htab->elf.dynobj = abfd; 1051 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1052 return FALSE; 1053 1054 /* Make sure an IFUNC symbol defined in a non-shared object 1055 always gets a PLT slot. */ 1056 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1057 { 1058 /* The symbol is called by the dynamic loader in order 1059 to resolve the relocation. So it is in fact also 1060 referenced. */ 1061 h->ref_regular = 1; 1062 h->needs_plt = 1; 1063 } 1064 } 1065 switch (r_type) 1066 { 1067 case R_390_GOTPC: 1068 case R_390_GOTPCDBL: 1069 /* These relocs do not need a GOT slot. They just load the 1070 GOT pointer itself or address something else relative to 1071 the GOT. Since the GOT pointer has been set up above we 1072 are done. */ 1073 break; 1074 case R_390_GOTOFF16: 1075 case R_390_GOTOFF32: 1076 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular) 1077 break; 1078 /* Fall through. */ 1079 1080 case R_390_PLT12DBL: 1081 case R_390_PLT16DBL: 1082 case R_390_PLT24DBL: 1083 case R_390_PLT32DBL: 1084 case R_390_PLT32: 1085 case R_390_PLTOFF16: 1086 case R_390_PLTOFF32: 1087 /* This symbol requires a procedure linkage table entry. We 1088 actually build the entry in adjust_dynamic_symbol, 1089 because this might be a case of linking PIC code which is 1090 never referenced by a dynamic object, in which case we 1091 don't need to generate a procedure linkage table entry 1092 after all. */ 1093 1094 /* If this is a local symbol, we resolve it directly without 1095 creating a procedure linkage table entry. */ 1096 if (h != NULL) 1097 { 1098 h->needs_plt = 1; 1099 h->plt.refcount += 1; 1100 } 1101 break; 1102 1103 case R_390_GOTPLT12: 1104 case R_390_GOTPLT16: 1105 case R_390_GOTPLT20: 1106 case R_390_GOTPLT32: 1107 case R_390_GOTPLTENT: 1108 /* This symbol requires either a procedure linkage table entry 1109 or an entry in the local got. We actually build the entry 1110 in adjust_dynamic_symbol because whether this is really a 1111 global reference can change and with it the fact if we have 1112 to create a plt entry or a local got entry. To be able to 1113 make a once global symbol a local one we have to keep track 1114 of the number of gotplt references that exist for this 1115 symbol. */ 1116 if (h != NULL) 1117 { 1118 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1119 h->needs_plt = 1; 1120 h->plt.refcount += 1; 1121 } 1122 else 1123 local_got_refcounts[r_symndx] += 1; 1124 break; 1125 1126 case R_390_TLS_LDM32: 1127 htab->tls_ldm_got.refcount += 1; 1128 break; 1129 1130 case R_390_TLS_IE32: 1131 case R_390_TLS_GOTIE12: 1132 case R_390_TLS_GOTIE20: 1133 case R_390_TLS_GOTIE32: 1134 case R_390_TLS_IEENT: 1135 if (bfd_link_pic (info)) 1136 info->flags |= DF_STATIC_TLS; 1137 /* Fall through. */ 1138 1139 case R_390_GOT12: 1140 case R_390_GOT16: 1141 case R_390_GOT20: 1142 case R_390_GOT32: 1143 case R_390_GOTENT: 1144 case R_390_TLS_GD32: 1145 /* This symbol requires a global offset table entry. */ 1146 switch (r_type) 1147 { 1148 default: 1149 case R_390_GOT12: 1150 case R_390_GOT16: 1151 case R_390_GOT20: 1152 case R_390_GOT32: 1153 case R_390_GOTENT: 1154 tls_type = GOT_NORMAL; 1155 break; 1156 case R_390_TLS_GD32: 1157 tls_type = GOT_TLS_GD; 1158 break; 1159 case R_390_TLS_IE32: 1160 case R_390_TLS_GOTIE32: 1161 tls_type = GOT_TLS_IE; 1162 break; 1163 case R_390_TLS_GOTIE12: 1164 case R_390_TLS_GOTIE20: 1165 case R_390_TLS_IEENT: 1166 tls_type = GOT_TLS_IE_NLT; 1167 break; 1168 } 1169 1170 if (h != NULL) 1171 { 1172 h->got.refcount += 1; 1173 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1174 } 1175 else 1176 { 1177 local_got_refcounts[r_symndx] += 1; 1178 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1179 } 1180 /* If a TLS symbol is accessed using IE at least once, 1181 there is no point to use dynamic model for it. */ 1182 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1183 { 1184 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1185 { 1186 _bfd_error_handler 1187 /* xgettext:c-format */ 1188 (_("%pB: `%s' accessed both as normal and thread local symbol"), 1189 abfd, h->root.root.string); 1190 return FALSE; 1191 } 1192 if (old_tls_type > tls_type) 1193 tls_type = old_tls_type; 1194 } 1195 1196 if (old_tls_type != tls_type) 1197 { 1198 if (h != NULL) 1199 elf_s390_hash_entry (h)->tls_type = tls_type; 1200 else 1201 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1202 } 1203 1204 if (r_type != R_390_TLS_IE32) 1205 break; 1206 /* Fall through. */ 1207 1208 case R_390_TLS_LE32: 1209 /* For static linking and executables this reloc will be 1210 calculated at linktime otherwise a TLS_TPOFF runtime 1211 reloc will be generated. */ 1212 if (r_type == R_390_TLS_LE32 && bfd_link_pie (info)) 1213 break; 1214 1215 if (!bfd_link_pic (info)) 1216 break; 1217 info->flags |= DF_STATIC_TLS; 1218 /* Fall through. */ 1219 1220 case R_390_8: 1221 case R_390_16: 1222 case R_390_32: 1223 case R_390_PC16: 1224 case R_390_PC12DBL: 1225 case R_390_PC16DBL: 1226 case R_390_PC24DBL: 1227 case R_390_PC32DBL: 1228 case R_390_PC32: 1229 if (h != NULL && bfd_link_executable (info)) 1230 { 1231 /* If this reloc is in a read-only section, we might 1232 need a copy reloc. We can't check reliably at this 1233 stage whether the section is read-only, as input 1234 sections have not yet been mapped to output sections. 1235 Tentatively set the flag for now, and correct in 1236 adjust_dynamic_symbol. */ 1237 h->non_got_ref = 1; 1238 1239 if (!bfd_link_pic (info)) 1240 { 1241 /* We may need a .plt entry if the function this reloc 1242 refers to is in a shared lib. */ 1243 h->plt.refcount += 1; 1244 } 1245 } 1246 1247 /* If we are creating a shared library, and this is a reloc 1248 against a global symbol, or a non PC relative reloc 1249 against a local symbol, then we need to copy the reloc 1250 into the shared library. However, if we are linking with 1251 -Bsymbolic, we do not need to copy a reloc against a 1252 global symbol which is defined in an object we are 1253 including in the link (i.e., DEF_REGULAR is set). At 1254 this point we have not seen all the input files, so it is 1255 possible that DEF_REGULAR is not set now but will be set 1256 later (it is never cleared). In case of a weak definition, 1257 DEF_REGULAR may be cleared later by a strong definition in 1258 a shared library. We account for that possibility below by 1259 storing information in the relocs_copied field of the hash 1260 table entry. A similar situation occurs when creating 1261 shared libraries and symbol visibility changes render the 1262 symbol local. 1263 1264 If on the other hand, we are creating an executable, we 1265 may need to keep relocations for symbols satisfied by a 1266 dynamic library if we manage to avoid copy relocs for the 1267 symbol. */ 1268 if ((bfd_link_pic (info) 1269 && (sec->flags & SEC_ALLOC) != 0 1270 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 1271 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL 1272 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL 1273 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL 1274 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL 1275 && ELF32_R_TYPE (rel->r_info) != R_390_PC32) 1276 || (h != NULL 1277 && (! SYMBOLIC_BIND (info, h) 1278 || h->root.type == bfd_link_hash_defweak 1279 || !h->def_regular)))) 1280 || (ELIMINATE_COPY_RELOCS 1281 && !bfd_link_pic (info) 1282 && (sec->flags & SEC_ALLOC) != 0 1283 && h != NULL 1284 && (h->root.type == bfd_link_hash_defweak 1285 || !h->def_regular))) 1286 { 1287 struct elf_dyn_relocs *p; 1288 struct elf_dyn_relocs **head; 1289 1290 /* We must copy these reloc types into the output file. 1291 Create a reloc section in dynobj and make room for 1292 this reloc. */ 1293 if (sreloc == NULL) 1294 { 1295 if (htab->elf.dynobj == NULL) 1296 htab->elf.dynobj = abfd; 1297 1298 sreloc = _bfd_elf_make_dynamic_reloc_section 1299 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE); 1300 1301 if (sreloc == NULL) 1302 return FALSE; 1303 } 1304 1305 /* If this is a global symbol, we count the number of 1306 relocations we need for this symbol. */ 1307 if (h != NULL) 1308 { 1309 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1310 } 1311 else 1312 { 1313 /* Track dynamic relocs needed for local syms too. 1314 We really need local syms available to do this 1315 easily. Oh well. */ 1316 asection *s; 1317 void *vpp; 1318 1319 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1320 abfd, r_symndx); 1321 if (isym == NULL) 1322 return FALSE; 1323 1324 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1325 if (s == NULL) 1326 s = sec; 1327 1328 vpp = &elf_section_data (s)->local_dynrel; 1329 head = (struct elf_dyn_relocs **) vpp; 1330 } 1331 1332 p = *head; 1333 if (p == NULL || p->sec != sec) 1334 { 1335 bfd_size_type amt = sizeof *p; 1336 1337 p = ((struct elf_dyn_relocs *) 1338 bfd_alloc (htab->elf.dynobj, amt)); 1339 if (p == NULL) 1340 return FALSE; 1341 p->next = *head; 1342 *head = p; 1343 p->sec = sec; 1344 p->count = 0; 1345 p->pc_count = 0; 1346 } 1347 1348 p->count += 1; 1349 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16 1350 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL 1351 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL 1352 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL 1353 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL 1354 || ELF32_R_TYPE (rel->r_info) == R_390_PC32) 1355 p->pc_count += 1; 1356 } 1357 break; 1358 1359 /* This relocation describes the C++ object vtable hierarchy. 1360 Reconstruct it for later use during GC. */ 1361 case R_390_GNU_VTINHERIT: 1362 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1363 return FALSE; 1364 break; 1365 1366 /* This relocation describes which C++ vtable entries are actually 1367 used. Record for later use during GC. */ 1368 case R_390_GNU_VTENTRY: 1369 BFD_ASSERT (h != NULL); 1370 if (h != NULL 1371 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1372 return FALSE; 1373 break; 1374 1375 default: 1376 break; 1377 } 1378 } 1379 1380 return TRUE; 1381 } 1382 1383 /* Return the section that should be marked against GC for a given 1384 relocation. */ 1385 1386 static asection * 1387 elf_s390_gc_mark_hook (asection *sec, 1388 struct bfd_link_info *info, 1389 Elf_Internal_Rela *rel, 1390 struct elf_link_hash_entry *h, 1391 Elf_Internal_Sym *sym) 1392 { 1393 if (h != NULL) 1394 switch (ELF32_R_TYPE (rel->r_info)) 1395 { 1396 case R_390_GNU_VTINHERIT: 1397 case R_390_GNU_VTENTRY: 1398 return NULL; 1399 } 1400 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1401 1402 } 1403 1404 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1405 entry but we found we will not create any. Called when we find we will 1406 not have any PLT for this symbol, by for example 1407 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1408 or elf_s390_size_dynamic_sections if no dynamic sections will be 1409 created (we're only linking static objects). */ 1410 1411 static void 1412 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h) 1413 { 1414 if (h->elf.root.type == bfd_link_hash_warning) 1415 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1416 1417 if (h->gotplt_refcount <= 0) 1418 return; 1419 1420 /* We simply add the number of gotplt references to the number 1421 * of got references for this symbol. */ 1422 h->elf.got.refcount += h->gotplt_refcount; 1423 h->gotplt_refcount = -1; 1424 } 1425 1426 /* Find dynamic relocs for H that apply to read-only sections. */ 1427 1428 static asection * 1429 readonly_dynrelocs (struct elf_link_hash_entry *h) 1430 { 1431 struct elf_dyn_relocs *p; 1432 1433 for (p = elf_s390_hash_entry (h)->dyn_relocs; p != NULL; p = p->next) 1434 { 1435 asection *s = p->sec->output_section; 1436 1437 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1438 return p->sec; 1439 } 1440 return NULL; 1441 } 1442 1443 /* Adjust a symbol defined by a dynamic object and referenced by a 1444 regular object. The current definition is in some section of the 1445 dynamic object, but we're not including those sections. We have to 1446 change the definition to something the rest of the link can 1447 understand. */ 1448 1449 static bfd_boolean 1450 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info, 1451 struct elf_link_hash_entry *h) 1452 { 1453 struct elf_s390_link_hash_table *htab; 1454 asection *s, *srel; 1455 1456 /* STT_GNU_IFUNC symbol must go through PLT. */ 1457 if (s390_is_ifunc_symbol_p (h)) 1458 { 1459 /* All local STT_GNU_IFUNC references must be treated as local 1460 calls via local PLT. */ 1461 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h)) 1462 { 1463 bfd_size_type pc_count = 0, count = 0; 1464 struct elf_dyn_relocs **pp; 1465 struct elf_s390_link_hash_entry *eh; 1466 struct elf_dyn_relocs *p; 1467 1468 eh = (struct elf_s390_link_hash_entry *) h; 1469 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1470 { 1471 pc_count += p->pc_count; 1472 p->count -= p->pc_count; 1473 p->pc_count = 0; 1474 count += p->count; 1475 if (p->count == 0) 1476 *pp = p->next; 1477 else 1478 pp = &p->next; 1479 } 1480 1481 if (pc_count || count) 1482 { 1483 h->needs_plt = 1; 1484 h->non_got_ref = 1; 1485 if (h->plt.refcount <= 0) 1486 h->plt.refcount = 1; 1487 else 1488 h->plt.refcount += 1; 1489 } 1490 } 1491 1492 if (h->plt.refcount <= 0) 1493 { 1494 h->plt.offset = (bfd_vma) -1; 1495 h->needs_plt = 0; 1496 } 1497 return TRUE; 1498 } 1499 1500 /* If this is a function, put it in the procedure linkage table. We 1501 will fill in the contents of the procedure linkage table later 1502 (although we could actually do it here). */ 1503 if (h->type == STT_FUNC 1504 || h->needs_plt) 1505 { 1506 if (h->plt.refcount <= 0 1507 || SYMBOL_CALLS_LOCAL (info, h) 1508 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1509 && h->root.type != bfd_link_hash_undefweak)) 1510 { 1511 /* This case can occur if we saw a PLT32 reloc in an input 1512 file, but the symbol was never referred to by a dynamic 1513 object, or if all references were garbage collected. In 1514 such a case, we don't actually need to build a procedure 1515 linkage table, and we can just do a PC32 reloc instead. */ 1516 h->plt.offset = (bfd_vma) -1; 1517 h->needs_plt = 0; 1518 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1519 } 1520 1521 return TRUE; 1522 } 1523 else 1524 /* It's possible that we incorrectly decided a .plt reloc was 1525 needed for an R_390_PC32 reloc to a non-function sym in 1526 check_relocs. We can't decide accurately between function and 1527 non-function syms in check-relocs; Objects loaded later in 1528 the link may change h->type. So fix it now. */ 1529 h->plt.offset = (bfd_vma) -1; 1530 1531 /* If this is a weak symbol, and there is a real definition, the 1532 processor independent code will have arranged for us to see the 1533 real definition first, and we can just use the same value. */ 1534 if (h->is_weakalias) 1535 { 1536 struct elf_link_hash_entry *def = weakdef (h); 1537 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 1538 h->root.u.def.section = def->root.u.def.section; 1539 h->root.u.def.value = def->root.u.def.value; 1540 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1541 h->non_got_ref = def->non_got_ref; 1542 return TRUE; 1543 } 1544 1545 /* This is a reference to a symbol defined by a dynamic object which 1546 is not a function. */ 1547 1548 /* If we are creating a shared library, we must presume that the 1549 only references to the symbol are via the global offset table. 1550 For such cases we need not do anything here; the relocations will 1551 be handled correctly by relocate_section. */ 1552 if (bfd_link_pic (info)) 1553 return TRUE; 1554 1555 /* If there are no references to this symbol that do not use the 1556 GOT, we don't need to generate a copy reloc. */ 1557 if (!h->non_got_ref) 1558 return TRUE; 1559 1560 /* If -z nocopyreloc was given, we won't generate them either. */ 1561 if (info->nocopyreloc) 1562 { 1563 h->non_got_ref = 0; 1564 return TRUE; 1565 } 1566 1567 /* If we don't find any dynamic relocs in read-only sections, then 1568 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1569 if (ELIMINATE_COPY_RELOCS && !readonly_dynrelocs (h)) 1570 { 1571 h->non_got_ref = 0; 1572 return TRUE; 1573 } 1574 1575 /* We must allocate the symbol in our .dynbss section, which will 1576 become part of the .bss section of the executable. There will be 1577 an entry for this symbol in the .dynsym section. The dynamic 1578 object will contain position independent code, so all references 1579 from the dynamic object to this symbol will go through the global 1580 offset table. The dynamic linker will use the .dynsym entry to 1581 determine the address it must put in the global offset table, so 1582 both the dynamic object and the regular object will refer to the 1583 same memory location for the variable. */ 1584 1585 htab = elf_s390_hash_table (info); 1586 1587 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1588 copy the initial value out of the dynamic object and into the 1589 runtime process image. */ 1590 if ((h->root.u.def.section->flags & SEC_READONLY) != 0) 1591 { 1592 s = htab->elf.sdynrelro; 1593 srel = htab->elf.sreldynrelro; 1594 } 1595 else 1596 { 1597 s = htab->elf.sdynbss; 1598 srel = htab->elf.srelbss; 1599 } 1600 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1601 { 1602 srel->size += sizeof (Elf32_External_Rela); 1603 h->needs_copy = 1; 1604 } 1605 1606 return _bfd_elf_adjust_dynamic_copy (info, h, s); 1607 } 1608 1609 /* Allocate space in .plt, .got and associated reloc sections for 1610 dynamic relocs. */ 1611 1612 static bfd_boolean 1613 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1614 { 1615 struct bfd_link_info *info; 1616 struct elf_s390_link_hash_table *htab; 1617 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h; 1618 struct elf_dyn_relocs *p; 1619 1620 if (h->root.type == bfd_link_hash_indirect) 1621 return TRUE; 1622 1623 info = (struct bfd_link_info *) inf; 1624 htab = elf_s390_hash_table (info); 1625 1626 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 1627 here if it is defined and referenced in a non-shared object. */ 1628 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1629 return s390_elf_allocate_ifunc_dyn_relocs (info, h); 1630 else if (htab->elf.dynamic_sections_created 1631 && h->plt.refcount > 0) 1632 { 1633 /* Make sure this symbol is output as a dynamic symbol. 1634 Undefined weak syms won't yet be marked as dynamic. */ 1635 if (h->dynindx == -1 1636 && !h->forced_local) 1637 { 1638 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1639 return FALSE; 1640 } 1641 1642 if (bfd_link_pic (info) 1643 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1644 { 1645 asection *s = htab->elf.splt; 1646 1647 /* If this is the first .plt entry, make room for the special 1648 first entry. */ 1649 if (s->size == 0) 1650 s->size += PLT_FIRST_ENTRY_SIZE; 1651 1652 h->plt.offset = s->size; 1653 1654 /* If this symbol is not defined in a regular file, and we are 1655 not generating a shared library, then set the symbol to this 1656 location in the .plt. This is required to make function 1657 pointers compare as equal between the normal executable and 1658 the shared library. */ 1659 if (! bfd_link_pic (info) 1660 && !h->def_regular) 1661 { 1662 h->root.u.def.section = s; 1663 h->root.u.def.value = h->plt.offset; 1664 } 1665 1666 /* Make room for this entry. */ 1667 s->size += PLT_ENTRY_SIZE; 1668 1669 /* We also need to make an entry in the .got.plt section. */ 1670 htab->elf.sgotplt->size += GOT_ENTRY_SIZE; 1671 1672 /* We also need to make an entry in the .rela.plt section. */ 1673 htab->elf.srelplt->size += sizeof (Elf32_External_Rela); 1674 } 1675 else 1676 { 1677 h->plt.offset = (bfd_vma) -1; 1678 h->needs_plt = 0; 1679 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1680 } 1681 } 1682 else 1683 { 1684 h->plt.offset = (bfd_vma) -1; 1685 h->needs_plt = 0; 1686 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1687 } 1688 1689 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to 1690 the binary, we can optimize a bit. IE32 and GOTIE32 get converted 1691 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT 1692 we can save the dynamic TLS relocation. */ 1693 if (h->got.refcount > 0 1694 && !bfd_link_pic (info) 1695 && h->dynindx == -1 1696 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1697 { 1698 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1699 /* For the GOTIE access without a literal pool entry the offset has 1700 to be stored somewhere. The immediate value in the instruction 1701 is not bit enough so the value is stored in the got. */ 1702 { 1703 h->got.offset = htab->elf.sgot->size; 1704 htab->elf.sgot->size += GOT_ENTRY_SIZE; 1705 } 1706 else 1707 h->got.offset = (bfd_vma) -1; 1708 } 1709 else if (h->got.refcount > 0) 1710 { 1711 asection *s; 1712 bfd_boolean dyn; 1713 int tls_type = elf_s390_hash_entry(h)->tls_type; 1714 1715 /* Make sure this symbol is output as a dynamic symbol. 1716 Undefined weak syms won't yet be marked as dynamic. */ 1717 if (h->dynindx == -1 1718 && !h->forced_local) 1719 { 1720 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1721 return FALSE; 1722 } 1723 1724 s = htab->elf.sgot; 1725 h->got.offset = s->size; 1726 s->size += GOT_ENTRY_SIZE; 1727 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */ 1728 if (tls_type == GOT_TLS_GD) 1729 s->size += GOT_ENTRY_SIZE; 1730 dyn = htab->elf.dynamic_sections_created; 1731 /* R_390_TLS_IE32 needs one dynamic relocation, 1732 R_390_TLS_GD32 needs one if local symbol and two if global. */ 1733 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1734 || tls_type >= GOT_TLS_IE) 1735 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1736 else if (tls_type == GOT_TLS_GD) 1737 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela); 1738 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1739 || h->root.type != bfd_link_hash_undefweak) 1740 && (bfd_link_pic (info) 1741 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1742 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1743 } 1744 else 1745 h->got.offset = (bfd_vma) -1; 1746 1747 if (eh->dyn_relocs == NULL) 1748 return TRUE; 1749 1750 /* In the shared -Bsymbolic case, discard space allocated for 1751 dynamic pc-relative relocs against symbols which turn out to be 1752 defined in regular objects. For the normal shared case, discard 1753 space for pc-relative relocs that have become local due to symbol 1754 visibility changes. */ 1755 1756 if (bfd_link_pic (info)) 1757 { 1758 if (SYMBOL_CALLS_LOCAL (info, h)) 1759 { 1760 struct elf_dyn_relocs **pp; 1761 1762 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1763 { 1764 p->count -= p->pc_count; 1765 p->pc_count = 0; 1766 if (p->count == 0) 1767 *pp = p->next; 1768 else 1769 pp = &p->next; 1770 } 1771 } 1772 1773 /* Also discard relocs on undefined weak syms with non-default 1774 visibility. */ 1775 if (eh->dyn_relocs != NULL 1776 && h->root.type == bfd_link_hash_undefweak) 1777 { 1778 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1779 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 1780 eh->dyn_relocs = NULL; 1781 1782 /* Make sure undefined weak symbols are output as a dynamic 1783 symbol in PIEs. */ 1784 else if (h->dynindx == -1 1785 && !h->forced_local) 1786 { 1787 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1788 return FALSE; 1789 } 1790 } 1791 } 1792 else if (ELIMINATE_COPY_RELOCS) 1793 { 1794 /* For the non-shared case, discard space for relocs against 1795 symbols which turn out to need copy relocs or are not 1796 dynamic. */ 1797 1798 if (!h->non_got_ref 1799 && ((h->def_dynamic 1800 && !h->def_regular) 1801 || (htab->elf.dynamic_sections_created 1802 && (h->root.type == bfd_link_hash_undefweak 1803 || h->root.type == bfd_link_hash_undefined)))) 1804 { 1805 /* Make sure this symbol is output as a dynamic symbol. 1806 Undefined weak syms won't yet be marked as dynamic. */ 1807 if (h->dynindx == -1 1808 && !h->forced_local) 1809 { 1810 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1811 return FALSE; 1812 } 1813 1814 /* If that succeeded, we know we'll be keeping all the 1815 relocs. */ 1816 if (h->dynindx != -1) 1817 goto keep; 1818 } 1819 1820 eh->dyn_relocs = NULL; 1821 1822 keep: ; 1823 } 1824 1825 /* Finally, allocate space. */ 1826 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1827 { 1828 asection *sreloc = elf_section_data (p->sec)->sreloc; 1829 1830 sreloc->size += p->count * sizeof (Elf32_External_Rela); 1831 } 1832 1833 return TRUE; 1834 } 1835 1836 /* Set DF_TEXTREL if we find any dynamic relocs that apply to 1837 read-only sections. */ 1838 1839 static bfd_boolean 1840 maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p) 1841 { 1842 asection *sec; 1843 1844 if (h->root.type == bfd_link_hash_indirect) 1845 return TRUE; 1846 1847 sec = readonly_dynrelocs (h); 1848 if (sec != NULL) 1849 { 1850 struct bfd_link_info *info = (struct bfd_link_info *) info_p; 1851 1852 info->flags |= DF_TEXTREL; 1853 info->callbacks->minfo 1854 (_("%pB: dynamic relocation against `%pT' in read-only section `%pA'\n"), 1855 sec->owner, h->root.root.string, sec); 1856 1857 /* Not an error, just cut short the traversal. */ 1858 return FALSE; 1859 } 1860 return TRUE; 1861 } 1862 1863 /* Set the sizes of the dynamic sections. */ 1864 1865 static bfd_boolean 1866 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1867 struct bfd_link_info *info) 1868 { 1869 struct elf_s390_link_hash_table *htab; 1870 bfd *dynobj; 1871 asection *s; 1872 bfd_boolean relocs; 1873 bfd *ibfd; 1874 1875 htab = elf_s390_hash_table (info); 1876 dynobj = htab->elf.dynobj; 1877 if (dynobj == NULL) 1878 abort (); 1879 1880 if (htab->elf.dynamic_sections_created) 1881 { 1882 /* Set the contents of the .interp section to the interpreter. */ 1883 if (bfd_link_executable (info) && !info->nointerp) 1884 { 1885 s = bfd_get_linker_section (dynobj, ".interp"); 1886 if (s == NULL) 1887 abort (); 1888 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1889 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1890 } 1891 } 1892 1893 /* Set up .got offsets for local syms, and space for local dynamic 1894 relocs. */ 1895 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 1896 { 1897 bfd_signed_vma *local_got; 1898 bfd_signed_vma *end_local_got; 1899 char *local_tls_type; 1900 bfd_size_type locsymcount; 1901 Elf_Internal_Shdr *symtab_hdr; 1902 asection *srela; 1903 struct plt_entry *local_plt; 1904 unsigned int i; 1905 1906 if (! is_s390_elf (ibfd)) 1907 continue; 1908 1909 for (s = ibfd->sections; s != NULL; s = s->next) 1910 { 1911 struct elf_dyn_relocs *p; 1912 1913 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 1914 { 1915 if (!bfd_is_abs_section (p->sec) 1916 && bfd_is_abs_section (p->sec->output_section)) 1917 { 1918 /* Input section has been discarded, either because 1919 it is a copy of a linkonce section or due to 1920 linker script /DISCARD/, so we'll be discarding 1921 the relocs too. */ 1922 } 1923 else if (p->count != 0) 1924 { 1925 srela = elf_section_data (p->sec)->sreloc; 1926 srela->size += p->count * sizeof (Elf32_External_Rela); 1927 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1928 info->flags |= DF_TEXTREL; 1929 } 1930 } 1931 } 1932 1933 local_got = elf_local_got_refcounts (ibfd); 1934 if (!local_got) 1935 continue; 1936 1937 symtab_hdr = &elf_symtab_hdr (ibfd); 1938 locsymcount = symtab_hdr->sh_info; 1939 end_local_got = local_got + locsymcount; 1940 local_tls_type = elf_s390_local_got_tls_type (ibfd); 1941 s = htab->elf.sgot; 1942 srela = htab->elf.srelgot; 1943 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 1944 { 1945 if (*local_got > 0) 1946 { 1947 *local_got = s->size; 1948 s->size += GOT_ENTRY_SIZE; 1949 if (*local_tls_type == GOT_TLS_GD) 1950 s->size += GOT_ENTRY_SIZE; 1951 if (bfd_link_pic (info)) 1952 srela->size += sizeof (Elf32_External_Rela); 1953 } 1954 else 1955 *local_got = (bfd_vma) -1; 1956 } 1957 local_plt = elf_s390_local_plt (ibfd); 1958 for (i = 0; i < symtab_hdr->sh_info; i++) 1959 { 1960 if (local_plt[i].plt.refcount > 0) 1961 { 1962 local_plt[i].plt.offset = htab->elf.iplt->size; 1963 htab->elf.iplt->size += PLT_ENTRY_SIZE; 1964 htab->elf.igotplt->size += GOT_ENTRY_SIZE; 1965 htab->elf.irelplt->size += RELA_ENTRY_SIZE; 1966 } 1967 else 1968 local_plt[i].plt.offset = (bfd_vma) -1; 1969 } 1970 } 1971 1972 if (htab->tls_ldm_got.refcount > 0) 1973 { 1974 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32 1975 relocs. */ 1976 htab->tls_ldm_got.offset = htab->elf.sgot->size; 1977 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; 1978 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1979 } 1980 else 1981 htab->tls_ldm_got.offset = -1; 1982 1983 /* Allocate global sym .plt and .got entries, and space for global 1984 sym dynamic relocs. */ 1985 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 1986 1987 /* We now have determined the sizes of the various dynamic sections. 1988 Allocate memory for them. */ 1989 relocs = FALSE; 1990 for (s = dynobj->sections; s != NULL; s = s->next) 1991 { 1992 if ((s->flags & SEC_LINKER_CREATED) == 0) 1993 continue; 1994 1995 if (s == htab->elf.splt 1996 || s == htab->elf.sgot 1997 || s == htab->elf.sgotplt 1998 || s == htab->elf.sdynbss 1999 || s == htab->elf.sdynrelro 2000 || s == htab->elf.iplt 2001 || s == htab->elf.igotplt 2002 || s == htab->irelifunc) 2003 { 2004 /* Strip this section if we don't need it; see the 2005 comment below. */ 2006 } 2007 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2008 { 2009 if (s->size != 0) 2010 relocs = TRUE; 2011 2012 /* We use the reloc_count field as a counter if we need 2013 to copy relocs into the output file. */ 2014 s->reloc_count = 0; 2015 } 2016 else 2017 { 2018 /* It's not one of our sections, so don't allocate space. */ 2019 continue; 2020 } 2021 2022 if (s->size == 0) 2023 { 2024 /* If we don't need this section, strip it from the 2025 output file. This is to handle .rela.bss and 2026 .rela.plt. We must create it in 2027 create_dynamic_sections, because it must be created 2028 before the linker maps input sections to output 2029 sections. The linker does that before 2030 adjust_dynamic_symbol is called, and it is that 2031 function which decides whether anything needs to go 2032 into these sections. */ 2033 2034 s->flags |= SEC_EXCLUDE; 2035 continue; 2036 } 2037 2038 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2039 continue; 2040 2041 /* Allocate memory for the section contents. We use bfd_zalloc 2042 here in case unused entries are not reclaimed before the 2043 section's contents are written out. This should not happen, 2044 but this way if it does, we get a R_390_NONE reloc instead 2045 of garbage. */ 2046 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2047 if (s->contents == NULL) 2048 return FALSE; 2049 } 2050 2051 if (htab->elf.dynamic_sections_created) 2052 { 2053 /* Add some entries to the .dynamic section. We fill in the 2054 values later, in elf_s390_finish_dynamic_sections, but we 2055 must add the entries now so that we get the correct size for 2056 the .dynamic section. The DT_DEBUG entry is filled in by the 2057 dynamic linker and used by the debugger. */ 2058 #define add_dynamic_entry(TAG, VAL) \ 2059 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2060 2061 if (bfd_link_executable (info)) 2062 { 2063 if (!add_dynamic_entry (DT_DEBUG, 0)) 2064 return FALSE; 2065 } 2066 2067 if (htab->elf.splt->size != 0) 2068 { 2069 if (!add_dynamic_entry (DT_PLTGOT, 0) 2070 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2071 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2072 || !add_dynamic_entry (DT_JMPREL, 0)) 2073 return FALSE; 2074 } 2075 2076 if (relocs) 2077 { 2078 if (!add_dynamic_entry (DT_RELA, 0) 2079 || !add_dynamic_entry (DT_RELASZ, 0) 2080 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 2081 return FALSE; 2082 2083 /* If any dynamic relocs apply to a read-only section, 2084 then we need a DT_TEXTREL entry. */ 2085 if ((info->flags & DF_TEXTREL) == 0) 2086 elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info); 2087 2088 if ((info->flags & DF_TEXTREL) != 0) 2089 { 2090 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2091 return FALSE; 2092 } 2093 } 2094 } 2095 #undef add_dynamic_entry 2096 2097 return TRUE; 2098 } 2099 2100 /* Return the base VMA address which should be subtracted from real addresses 2101 when resolving @dtpoff relocation. 2102 This is PT_TLS segment p_vaddr. */ 2103 2104 static bfd_vma 2105 dtpoff_base (struct bfd_link_info *info) 2106 { 2107 /* If tls_sec is NULL, we should have signalled an error already. */ 2108 if (elf_hash_table (info)->tls_sec == NULL) 2109 return 0; 2110 return elf_hash_table (info)->tls_sec->vma; 2111 } 2112 2113 /* Return the relocation value for @tpoff relocation 2114 if STT_TLS virtual address is ADDRESS. */ 2115 2116 static bfd_vma 2117 tpoff (struct bfd_link_info *info, bfd_vma address) 2118 { 2119 struct elf_link_hash_table *htab = elf_hash_table (info); 2120 2121 /* If tls_sec is NULL, we should have signalled an error already. */ 2122 if (htab->tls_sec == NULL) 2123 return 0; 2124 return htab->tls_size + htab->tls_sec->vma - address; 2125 } 2126 2127 /* Complain if TLS instruction relocation is against an invalid 2128 instruction. */ 2129 2130 static void 2131 invalid_tls_insn (bfd *input_bfd, 2132 asection *input_section, 2133 Elf_Internal_Rela *rel) 2134 { 2135 reloc_howto_type *howto; 2136 2137 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info); 2138 _bfd_error_handler 2139 /* xgettext:c-format */ 2140 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"), 2141 input_bfd, 2142 input_section, 2143 (uint64_t) rel->r_offset, 2144 howto->name); 2145 bfd_set_error (bfd_error_bad_value); 2146 } 2147 2148 /* Relocate a 390 ELF section. */ 2149 2150 static bfd_boolean 2151 elf_s390_relocate_section (bfd *output_bfd, 2152 struct bfd_link_info *info, 2153 bfd *input_bfd, 2154 asection *input_section, 2155 bfd_byte *contents, 2156 Elf_Internal_Rela *relocs, 2157 Elf_Internal_Sym *local_syms, 2158 asection **local_sections) 2159 { 2160 struct elf_s390_link_hash_table *htab; 2161 Elf_Internal_Shdr *symtab_hdr; 2162 struct elf_link_hash_entry **sym_hashes; 2163 bfd_vma *local_got_offsets; 2164 Elf_Internal_Rela *rel; 2165 Elf_Internal_Rela *relend; 2166 2167 if (!is_s390_elf (input_bfd)) 2168 { 2169 bfd_set_error (bfd_error_wrong_format); 2170 return FALSE; 2171 } 2172 2173 htab = elf_s390_hash_table (info); 2174 symtab_hdr = &elf_symtab_hdr (input_bfd); 2175 sym_hashes = elf_sym_hashes (input_bfd); 2176 local_got_offsets = elf_local_got_offsets (input_bfd); 2177 2178 rel = relocs; 2179 relend = relocs + input_section->reloc_count; 2180 for (; rel < relend; rel++) 2181 { 2182 unsigned int r_type; 2183 reloc_howto_type *howto; 2184 unsigned long r_symndx; 2185 struct elf_link_hash_entry *h; 2186 Elf_Internal_Sym *sym; 2187 asection *sec; 2188 bfd_vma off; 2189 bfd_vma relocation; 2190 bfd_boolean unresolved_reloc; 2191 bfd_reloc_status_type r; 2192 int tls_type; 2193 asection *base_got = htab->elf.sgot; 2194 bfd_boolean resolved_to_zero; 2195 2196 r_type = ELF32_R_TYPE (rel->r_info); 2197 if (r_type == (int) R_390_GNU_VTINHERIT 2198 || r_type == (int) R_390_GNU_VTENTRY) 2199 continue; 2200 if (r_type >= (int) R_390_max) 2201 { 2202 bfd_set_error (bfd_error_bad_value); 2203 return FALSE; 2204 } 2205 2206 howto = elf_howto_table + r_type; 2207 r_symndx = ELF32_R_SYM (rel->r_info); 2208 2209 h = NULL; 2210 sym = NULL; 2211 sec = NULL; 2212 unresolved_reloc = FALSE; 2213 if (r_symndx < symtab_hdr->sh_info) 2214 { 2215 sym = local_syms + r_symndx; 2216 sec = local_sections[r_symndx]; 2217 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2218 { 2219 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd); 2220 if (local_plt == NULL) 2221 return FALSE; 2222 2223 /* Address of the PLT slot. */ 2224 relocation = (htab->elf.iplt->output_section->vma 2225 + htab->elf.iplt->output_offset 2226 + local_plt[r_symndx].plt.offset); 2227 2228 switch (r_type) 2229 { 2230 case R_390_PLTOFF16: 2231 case R_390_PLTOFF32: 2232 relocation -= htab->elf.sgot->output_section->vma; 2233 break; 2234 case R_390_GOTPLT12: 2235 case R_390_GOTPLT16: 2236 case R_390_GOTPLT20: 2237 case R_390_GOTPLT32: 2238 case R_390_GOTPLTENT: 2239 case R_390_GOT12: 2240 case R_390_GOT16: 2241 case R_390_GOT20: 2242 case R_390_GOT32: 2243 case R_390_GOTENT: 2244 { 2245 /* Write the PLT slot address into the GOT slot. */ 2246 bfd_put_32 (output_bfd, relocation, 2247 htab->elf.sgot->contents + 2248 local_got_offsets[r_symndx]); 2249 relocation = (local_got_offsets[r_symndx] + 2250 htab->elf.sgot->output_offset); 2251 2252 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2253 relocation += htab->elf.sgot->output_section->vma; 2254 break; 2255 } 2256 default: 2257 break; 2258 } 2259 /* The output section is needed later in 2260 finish_dynamic_section when creating the dynamic 2261 relocation. */ 2262 local_plt[r_symndx].sec = sec; 2263 goto do_relocation; 2264 } 2265 else 2266 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2267 } 2268 else 2269 { 2270 bfd_boolean warned ATTRIBUTE_UNUSED; 2271 bfd_boolean ignored ATTRIBUTE_UNUSED; 2272 2273 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2274 r_symndx, symtab_hdr, sym_hashes, 2275 h, sec, relocation, 2276 unresolved_reloc, warned, ignored); 2277 } 2278 2279 if (sec != NULL && discarded_section (sec)) 2280 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2281 rel, 1, relend, howto, 0, contents); 2282 2283 if (bfd_link_relocatable (info)) 2284 continue; 2285 2286 resolved_to_zero = (h != NULL 2287 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); 2288 2289 switch (r_type) 2290 { 2291 case R_390_GOTPLT12: 2292 case R_390_GOTPLT16: 2293 case R_390_GOTPLT20: 2294 case R_390_GOTPLT32: 2295 case R_390_GOTPLTENT: 2296 /* There are three cases for a GOTPLT relocation. 1) The 2297 relocation is against the jump slot entry of a plt that 2298 will get emitted to the output file. 2) The relocation 2299 is against the jump slot of a plt entry that has been 2300 removed. elf_s390_adjust_gotplt has created a GOT entry 2301 as replacement. 3) The relocation is against a local symbol. 2302 Cases 2) and 3) are the same as the GOT relocation code 2303 so we just have to test for case 1 and fall through for 2304 the other two. */ 2305 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2306 { 2307 bfd_vma plt_index; 2308 2309 if (s390_is_ifunc_symbol_p (h)) 2310 { 2311 plt_index = h->plt.offset / PLT_ENTRY_SIZE; 2312 relocation = (plt_index * GOT_ENTRY_SIZE + 2313 htab->elf.igotplt->output_offset); 2314 if (r_type == R_390_GOTPLTENT) 2315 relocation += htab->elf.igotplt->output_section->vma; 2316 } 2317 else 2318 { 2319 /* Calc. index no. 2320 Current offset - size first entry / entry size. */ 2321 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2322 PLT_ENTRY_SIZE; 2323 2324 /* Offset in GOT is PLT index plus GOT headers(3) 2325 times 4, addr & GOT addr. */ 2326 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2327 if (r_type == R_390_GOTPLTENT) 2328 relocation += htab->elf.sgot->output_section->vma; 2329 } 2330 unresolved_reloc = FALSE; 2331 2332 } 2333 /* Fall through. */ 2334 2335 case R_390_GOT12: 2336 case R_390_GOT16: 2337 case R_390_GOT20: 2338 case R_390_GOT32: 2339 case R_390_GOTENT: 2340 /* Relocation is to the entry for this symbol in the global 2341 offset table. */ 2342 if (base_got == NULL) 2343 abort (); 2344 2345 if (h != NULL) 2346 { 2347 bfd_boolean dyn; 2348 2349 off = h->got.offset; 2350 dyn = htab->elf.dynamic_sections_created; 2351 2352 if (s390_is_ifunc_symbol_p (h)) 2353 { 2354 BFD_ASSERT (h->plt.offset != (bfd_vma) -1); 2355 if (off == (bfd_vma)-1) 2356 { 2357 /* No explicit GOT usage so redirect to the 2358 got.iplt slot. */ 2359 base_got = htab->elf.igotplt; 2360 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE; 2361 } 2362 else 2363 { 2364 /* Explicit GOT slots must contain the address 2365 of the PLT slot. This will be handled in 2366 finish_dynamic_symbol. */ 2367 } 2368 } 2369 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 2370 bfd_link_pic (info), 2371 h) 2372 || (bfd_link_pic (info) 2373 && SYMBOL_REFERENCES_LOCAL (info, h)) 2374 || (ELF_ST_VISIBILITY (h->other) 2375 && h->root.type == bfd_link_hash_undefweak)) 2376 2377 { 2378 /* This is actually a static link, or it is a 2379 -Bsymbolic link and the symbol is defined 2380 locally, or the symbol was forced to be local 2381 because of a version file. We must initialize 2382 this entry in the global offset table. Since the 2383 offset must always be a multiple of 2, we use the 2384 least significant bit to record whether we have 2385 initialized it already. 2386 2387 When doing a dynamic link, we create a .rel.got 2388 relocation entry to initialize the value. This 2389 is done in the finish_dynamic_symbol routine. */ 2390 if ((off & 1) != 0) 2391 off &= ~1; 2392 else 2393 { 2394 bfd_put_32 (output_bfd, relocation, 2395 base_got->contents + off); 2396 h->got.offset |= 1; 2397 } 2398 2399 if ((h->def_regular 2400 && bfd_link_pic (info) 2401 && SYMBOL_REFERENCES_LOCAL (info, h)) 2402 /* lrl rx,sym@GOTENT -> larl rx, sym */ 2403 && ((r_type == R_390_GOTENT 2404 && (bfd_get_16 (input_bfd, 2405 contents + rel->r_offset - 2) 2406 & 0xff0f) == 0xc40d) 2407 /* ly rx, sym@GOT(r12) -> larl rx, sym */ 2408 || (r_type == R_390_GOT20 2409 && (bfd_get_32 (input_bfd, 2410 contents + rel->r_offset - 2) 2411 & 0xff00f000) == 0xe300c000 2412 && bfd_get_8 (input_bfd, 2413 contents + rel->r_offset + 3) == 0x58))) 2414 { 2415 unsigned short new_insn = 2416 (0xc000 | (bfd_get_8 (input_bfd, 2417 contents + rel->r_offset - 1) & 0xf0)); 2418 bfd_put_16 (output_bfd, new_insn, 2419 contents + rel->r_offset - 2); 2420 r_type = R_390_PC32DBL; 2421 rel->r_addend = 2; 2422 howto = elf_howto_table + r_type; 2423 relocation = h->root.u.def.value 2424 + h->root.u.def.section->output_section->vma 2425 + h->root.u.def.section->output_offset; 2426 goto do_relocation; 2427 } 2428 } 2429 else 2430 unresolved_reloc = FALSE; 2431 } 2432 else 2433 { 2434 if (local_got_offsets == NULL) 2435 abort (); 2436 2437 off = local_got_offsets[r_symndx]; 2438 2439 /* The offset must always be a multiple of 4. We use 2440 the least significant bit to record whether we have 2441 already generated the necessary reloc. */ 2442 if ((off & 1) != 0) 2443 off &= ~1; 2444 else 2445 { 2446 bfd_put_32 (output_bfd, relocation, 2447 htab->elf.sgot->contents + off); 2448 2449 if (bfd_link_pic (info)) 2450 { 2451 asection *srelgot; 2452 Elf_Internal_Rela outrel; 2453 bfd_byte *loc; 2454 2455 srelgot = htab->elf.srelgot; 2456 if (srelgot == NULL) 2457 abort (); 2458 2459 outrel.r_offset = (htab->elf.sgot->output_section->vma 2460 + htab->elf.sgot->output_offset 2461 + off); 2462 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2463 outrel.r_addend = relocation; 2464 loc = srelgot->contents; 2465 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 2466 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2467 } 2468 2469 local_got_offsets[r_symndx] |= 1; 2470 } 2471 } 2472 2473 if (off >= (bfd_vma) -2) 2474 abort (); 2475 2476 relocation = base_got->output_offset + off; 2477 2478 /* For @GOTENT the relocation is against the offset between 2479 the instruction and the symbols entry in the GOT and not 2480 between the start of the GOT and the symbols entry. We 2481 add the vma of the GOT to get the correct value. */ 2482 if ( r_type == R_390_GOTENT 2483 || r_type == R_390_GOTPLTENT) 2484 relocation += base_got->output_section->vma; 2485 2486 break; 2487 2488 case R_390_GOTOFF16: 2489 case R_390_GOTOFF32: 2490 /* Relocation is relative to the start of the global offset 2491 table. */ 2492 2493 if (h != NULL 2494 && s390_is_ifunc_symbol_p (h) 2495 && h->def_regular 2496 && !bfd_link_executable (info)) 2497 { 2498 relocation = (htab->elf.iplt->output_section->vma 2499 + htab->elf.iplt->output_offset 2500 + h->plt.offset 2501 - htab->elf.sgot->output_section->vma); 2502 goto do_relocation; 2503 } 2504 2505 /* Note that sgot->output_offset is not involved in this 2506 calculation. We always want the start of .got. If we 2507 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2508 permitted by the ABI, we might have to change this 2509 calculation. */ 2510 relocation -= htab->elf.sgot->output_section->vma; 2511 break; 2512 2513 case R_390_GOTPC: 2514 case R_390_GOTPCDBL: 2515 /* Use global offset table as symbol value. */ 2516 relocation = htab->elf.sgot->output_section->vma; 2517 unresolved_reloc = FALSE; 2518 break; 2519 2520 case R_390_PLT12DBL: 2521 case R_390_PLT16DBL: 2522 case R_390_PLT24DBL: 2523 case R_390_PLT32DBL: 2524 case R_390_PLT32: 2525 /* Relocation is to the entry for this symbol in the 2526 procedure linkage table. */ 2527 2528 /* Resolve a PLT32 reloc against a local symbol directly, 2529 without using the procedure linkage table. */ 2530 if (h == NULL) 2531 break; 2532 2533 if (h->plt.offset == (bfd_vma) -1 2534 || (htab->elf.splt == NULL && htab->elf.iplt == NULL)) 2535 { 2536 /* We didn't make a PLT entry for this symbol. This 2537 happens when statically linking PIC code, or when 2538 using -Bsymbolic. */ 2539 break; 2540 } 2541 2542 if (s390_is_ifunc_symbol_p (h)) 2543 relocation = (htab->elf.iplt->output_section->vma 2544 + htab->elf.iplt->output_offset 2545 + h->plt.offset); 2546 else 2547 relocation = (htab->elf.splt->output_section->vma 2548 + htab->elf.splt->output_offset 2549 + h->plt.offset); 2550 unresolved_reloc = FALSE; 2551 break; 2552 2553 case R_390_PLTOFF16: 2554 case R_390_PLTOFF32: 2555 /* Relocation is to the entry for this symbol in the 2556 procedure linkage table relative to the start of the GOT. */ 2557 2558 /* For local symbols or if we didn't make a PLT entry for 2559 this symbol resolve the symbol directly. */ 2560 if (h == NULL 2561 || h->plt.offset == (bfd_vma) -1 2562 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h))) 2563 { 2564 relocation -= htab->elf.sgot->output_section->vma; 2565 break; 2566 } 2567 2568 if (s390_is_ifunc_symbol_p (h)) 2569 relocation = (htab->elf.iplt->output_section->vma 2570 + htab->elf.iplt->output_offset 2571 + h->plt.offset 2572 - htab->elf.sgot->output_section->vma); 2573 else 2574 relocation = (htab->elf.splt->output_section->vma 2575 + htab->elf.splt->output_offset 2576 + h->plt.offset 2577 - htab->elf.sgot->output_section->vma); 2578 unresolved_reloc = FALSE; 2579 break; 2580 2581 case R_390_PC16: 2582 case R_390_PC12DBL: 2583 case R_390_PC16DBL: 2584 case R_390_PC24DBL: 2585 case R_390_PC32DBL: 2586 case R_390_PC32: 2587 if (h != NULL 2588 && s390_is_ifunc_symbol_p (h) 2589 && h->def_regular 2590 && !bfd_link_executable (info)) 2591 { 2592 /* This will not work our if the function does not 2593 happen to set up the GOT pointer for some other 2594 reason. 31 bit PLT entries require r12 to hold the 2595 GOT pointer. 2596 FIXME: Implement an errorcheck. 2597 NOTE: It will work when brasl is not available 2598 (e.g. with -m31 -march=g5) since a local function 2599 call then does use GOTOFF which implies r12 being set 2600 up. */ 2601 relocation = (htab->elf.iplt->output_section->vma 2602 + htab->elf.iplt->output_offset 2603 + h ->plt.offset); 2604 goto do_relocation; 2605 } 2606 /* Fall through. */ 2607 2608 case R_390_8: 2609 case R_390_16: 2610 case R_390_32: 2611 if ((input_section->flags & SEC_ALLOC) == 0) 2612 break; 2613 2614 if (h != NULL 2615 && s390_is_ifunc_symbol_p (h) 2616 && h->def_regular) 2617 { 2618 if (!bfd_link_pic (info)) 2619 { 2620 /* For a non-shared object STT_GNU_IFUNC symbol must 2621 go through PLT. */ 2622 relocation = (htab->elf.iplt->output_section->vma 2623 + htab->elf.iplt->output_offset 2624 + h ->plt.offset); 2625 goto do_relocation; 2626 } 2627 else 2628 { 2629 /* For shared objects a runtime relocation is needed. */ 2630 2631 Elf_Internal_Rela outrel; 2632 asection *sreloc; 2633 2634 /* Need a dynamic relocation to get the real function 2635 address. */ 2636 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2637 info, 2638 input_section, 2639 rel->r_offset); 2640 if (outrel.r_offset == (bfd_vma) -1 2641 || outrel.r_offset == (bfd_vma) -2) 2642 abort (); 2643 2644 outrel.r_offset += (input_section->output_section->vma 2645 + input_section->output_offset); 2646 2647 if (h->dynindx == -1 2648 || h->forced_local 2649 || bfd_link_executable (info)) 2650 { 2651 /* This symbol is resolved locally. */ 2652 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 2653 outrel.r_addend = (h->root.u.def.value 2654 + h->root.u.def.section->output_section->vma 2655 + h->root.u.def.section->output_offset); 2656 } 2657 else 2658 { 2659 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2660 outrel.r_addend = 0; 2661 } 2662 2663 sreloc = htab->elf.irelifunc; 2664 elf_append_rela (output_bfd, sreloc, &outrel); 2665 2666 /* If this reloc is against an external symbol, we 2667 do not want to fiddle with the addend. Otherwise, 2668 we need to include the symbol value so that it 2669 becomes an addend for the dynamic reloc. For an 2670 internal symbol, we have updated addend. */ 2671 continue; 2672 } 2673 } 2674 2675 if ((bfd_link_pic (info) 2676 && (h == NULL 2677 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2678 && !resolved_to_zero) 2679 || h->root.type != bfd_link_hash_undefweak) 2680 && ((r_type != R_390_PC16 2681 && r_type != R_390_PC12DBL 2682 && r_type != R_390_PC16DBL 2683 && r_type != R_390_PC24DBL 2684 && r_type != R_390_PC32DBL 2685 && r_type != R_390_PC32) 2686 || !SYMBOL_CALLS_LOCAL (info, h))) 2687 || (ELIMINATE_COPY_RELOCS 2688 && !bfd_link_pic (info) 2689 && h != NULL 2690 && h->dynindx != -1 2691 && !h->non_got_ref 2692 && ((h->def_dynamic 2693 && !h->def_regular) 2694 || h->root.type == bfd_link_hash_undefweak 2695 || h->root.type == bfd_link_hash_undefined))) 2696 { 2697 Elf_Internal_Rela outrel; 2698 bfd_boolean skip, relocate; 2699 asection *sreloc; 2700 bfd_byte *loc; 2701 2702 /* When generating a shared object, these relocations 2703 are copied into the output file to be resolved at run 2704 time. */ 2705 2706 skip = FALSE; 2707 relocate = FALSE; 2708 2709 outrel.r_offset = 2710 _bfd_elf_section_offset (output_bfd, info, input_section, 2711 rel->r_offset); 2712 if (outrel.r_offset == (bfd_vma) -1) 2713 skip = TRUE; 2714 else if (outrel.r_offset == (bfd_vma) -2) 2715 skip = TRUE, relocate = TRUE; 2716 outrel.r_offset += (input_section->output_section->vma 2717 + input_section->output_offset); 2718 2719 if (skip) 2720 memset (&outrel, 0, sizeof outrel); 2721 else if (h != NULL 2722 && h->dynindx != -1 2723 && (r_type == R_390_PC16 2724 || r_type == R_390_PC12DBL 2725 || r_type == R_390_PC16DBL 2726 || r_type == R_390_PC24DBL 2727 || r_type == R_390_PC32DBL 2728 || r_type == R_390_PC32 2729 || !bfd_link_pic (info) 2730 || !SYMBOLIC_BIND (info, h) 2731 || !h->def_regular)) 2732 { 2733 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2734 outrel.r_addend = rel->r_addend; 2735 } 2736 else 2737 { 2738 /* This symbol is local, or marked to become local. */ 2739 outrel.r_addend = relocation + rel->r_addend; 2740 if (r_type == R_390_32) 2741 { 2742 relocate = TRUE; 2743 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2744 } 2745 else 2746 { 2747 long sindx; 2748 2749 if (bfd_is_abs_section (sec)) 2750 sindx = 0; 2751 else if (sec == NULL || sec->owner == NULL) 2752 { 2753 bfd_set_error(bfd_error_bad_value); 2754 return FALSE; 2755 } 2756 else 2757 { 2758 asection *osec; 2759 2760 osec = sec->output_section; 2761 sindx = elf_section_data (osec)->dynindx; 2762 if (sindx == 0) 2763 { 2764 osec = htab->elf.text_index_section; 2765 sindx = elf_section_data (osec)->dynindx; 2766 } 2767 BFD_ASSERT (sindx != 0); 2768 2769 /* We are turning this relocation into one 2770 against a section symbol, so subtract out 2771 the output section's address but not the 2772 offset of the input section in the output 2773 section. */ 2774 outrel.r_addend -= osec->vma; 2775 } 2776 outrel.r_info = ELF32_R_INFO (sindx, r_type); 2777 } 2778 } 2779 2780 sreloc = elf_section_data (input_section)->sreloc; 2781 if (sreloc == NULL) 2782 abort (); 2783 2784 loc = sreloc->contents; 2785 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2786 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2787 2788 /* If this reloc is against an external symbol, we do 2789 not want to fiddle with the addend. Otherwise, we 2790 need to include the symbol value so that it becomes 2791 an addend for the dynamic reloc. */ 2792 if (! relocate) 2793 continue; 2794 } 2795 break; 2796 2797 /* Relocations for tls literal pool entries. */ 2798 case R_390_TLS_IE32: 2799 if (bfd_link_pic (info)) 2800 { 2801 Elf_Internal_Rela outrel; 2802 asection *sreloc; 2803 bfd_byte *loc; 2804 2805 outrel.r_offset = rel->r_offset 2806 + input_section->output_section->vma 2807 + input_section->output_offset; 2808 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2809 sreloc = elf_section_data (input_section)->sreloc; 2810 if (sreloc == NULL) 2811 abort (); 2812 loc = sreloc->contents; 2813 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2814 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2815 } 2816 /* Fall through. */ 2817 2818 case R_390_TLS_GD32: 2819 case R_390_TLS_GOTIE32: 2820 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2821 tls_type = GOT_UNKNOWN; 2822 if (h == NULL && local_got_offsets) 2823 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2824 else if (h != NULL) 2825 { 2826 tls_type = elf_s390_hash_entry(h)->tls_type; 2827 if (!bfd_link_pic (info) 2828 && h->dynindx == -1 2829 && tls_type >= GOT_TLS_IE) 2830 r_type = R_390_TLS_LE32; 2831 } 2832 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE) 2833 r_type = R_390_TLS_IE32; 2834 2835 if (r_type == R_390_TLS_LE32) 2836 { 2837 /* This relocation gets optimized away by the local exec 2838 access optimization. */ 2839 BFD_ASSERT (! unresolved_reloc); 2840 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2841 contents + rel->r_offset); 2842 continue; 2843 } 2844 2845 if (htab->elf.sgot == NULL) 2846 abort (); 2847 2848 if (h != NULL) 2849 off = h->got.offset; 2850 else 2851 { 2852 if (local_got_offsets == NULL) 2853 abort (); 2854 2855 off = local_got_offsets[r_symndx]; 2856 } 2857 2858 emit_tls_relocs: 2859 2860 if ((off & 1) != 0) 2861 off &= ~1; 2862 else 2863 { 2864 Elf_Internal_Rela outrel; 2865 bfd_byte *loc; 2866 int dr_type, indx; 2867 2868 if (htab->elf.srelgot == NULL) 2869 abort (); 2870 2871 outrel.r_offset = (htab->elf.sgot->output_section->vma 2872 + htab->elf.sgot->output_offset + off); 2873 2874 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2875 if (r_type == R_390_TLS_GD32) 2876 dr_type = R_390_TLS_DTPMOD; 2877 else 2878 dr_type = R_390_TLS_TPOFF; 2879 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2880 outrel.r_addend = relocation - dtpoff_base (info); 2881 else 2882 outrel.r_addend = 0; 2883 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2884 loc = htab->elf.srelgot->contents; 2885 loc += htab->elf.srelgot->reloc_count++ 2886 * sizeof (Elf32_External_Rela); 2887 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2888 2889 if (r_type == R_390_TLS_GD32) 2890 { 2891 if (indx == 0) 2892 { 2893 BFD_ASSERT (! unresolved_reloc); 2894 bfd_put_32 (output_bfd, 2895 relocation - dtpoff_base (info), 2896 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 2897 } 2898 else 2899 { 2900 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF); 2901 outrel.r_offset += GOT_ENTRY_SIZE; 2902 outrel.r_addend = 0; 2903 htab->elf.srelgot->reloc_count++; 2904 loc += sizeof (Elf32_External_Rela); 2905 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2906 } 2907 } 2908 2909 if (h != NULL) 2910 h->got.offset |= 1; 2911 else 2912 local_got_offsets[r_symndx] |= 1; 2913 } 2914 2915 if (off >= (bfd_vma) -2) 2916 abort (); 2917 if (r_type == ELF32_R_TYPE (rel->r_info)) 2918 { 2919 relocation = htab->elf.sgot->output_offset + off; 2920 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT) 2921 relocation += htab->elf.sgot->output_section->vma; 2922 unresolved_reloc = FALSE; 2923 } 2924 else 2925 { 2926 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off, 2927 contents + rel->r_offset); 2928 continue; 2929 } 2930 break; 2931 2932 case R_390_TLS_GOTIE12: 2933 case R_390_TLS_GOTIE20: 2934 case R_390_TLS_IEENT: 2935 if (h == NULL) 2936 { 2937 if (local_got_offsets == NULL) 2938 abort(); 2939 off = local_got_offsets[r_symndx]; 2940 if (bfd_link_pic (info)) 2941 goto emit_tls_relocs; 2942 } 2943 else 2944 { 2945 off = h->got.offset; 2946 tls_type = elf_s390_hash_entry(h)->tls_type; 2947 if (bfd_link_pic (info) 2948 || h->dynindx != -1 2949 || tls_type < GOT_TLS_IE) 2950 goto emit_tls_relocs; 2951 } 2952 2953 if (htab->elf.sgot == NULL) 2954 abort (); 2955 2956 BFD_ASSERT (! unresolved_reloc); 2957 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2958 htab->elf.sgot->contents + off); 2959 relocation = htab->elf.sgot->output_offset + off; 2960 if (r_type == R_390_TLS_IEENT) 2961 relocation += htab->elf.sgot->output_section->vma; 2962 unresolved_reloc = FALSE; 2963 break; 2964 2965 case R_390_TLS_LDM32: 2966 if (! bfd_link_pic (info)) 2967 /* The literal pool entry this relocation refers to gets ignored 2968 by the optimized code of the local exec model. Do nothing 2969 and the value will turn out zero. */ 2970 continue; 2971 2972 if (htab->elf.sgot == NULL) 2973 abort (); 2974 2975 off = htab->tls_ldm_got.offset; 2976 if (off & 1) 2977 off &= ~1; 2978 else 2979 { 2980 Elf_Internal_Rela outrel; 2981 bfd_byte *loc; 2982 2983 if (htab->elf.srelgot == NULL) 2984 abort (); 2985 2986 outrel.r_offset = (htab->elf.sgot->output_section->vma 2987 + htab->elf.sgot->output_offset + off); 2988 2989 bfd_put_32 (output_bfd, 0, 2990 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 2991 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD); 2992 outrel.r_addend = 0; 2993 loc = htab->elf.srelgot->contents; 2994 loc += htab->elf.srelgot->reloc_count++ 2995 * sizeof (Elf32_External_Rela); 2996 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2997 htab->tls_ldm_got.offset |= 1; 2998 } 2999 relocation = htab->elf.sgot->output_offset + off; 3000 unresolved_reloc = FALSE; 3001 break; 3002 3003 case R_390_TLS_LE32: 3004 if (bfd_link_dll (info)) 3005 { 3006 /* Linking a shared library with non-fpic code requires 3007 a R_390_TLS_TPOFF relocation. */ 3008 Elf_Internal_Rela outrel; 3009 asection *sreloc; 3010 bfd_byte *loc; 3011 int indx; 3012 3013 outrel.r_offset = rel->r_offset 3014 + input_section->output_section->vma 3015 + input_section->output_offset; 3016 if (h != NULL && h->dynindx != -1) 3017 indx = h->dynindx; 3018 else 3019 indx = 0; 3020 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF); 3021 if (indx == 0) 3022 outrel.r_addend = relocation - dtpoff_base (info); 3023 else 3024 outrel.r_addend = 0; 3025 sreloc = elf_section_data (input_section)->sreloc; 3026 if (sreloc == NULL) 3027 abort (); 3028 loc = sreloc->contents; 3029 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 3030 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3031 } 3032 else 3033 { 3034 BFD_ASSERT (! unresolved_reloc); 3035 bfd_put_32 (output_bfd, -tpoff (info, relocation), 3036 contents + rel->r_offset); 3037 } 3038 continue; 3039 3040 case R_390_TLS_LDO32: 3041 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING)) 3042 relocation -= dtpoff_base (info); 3043 else 3044 /* When converting LDO to LE, we must negate. */ 3045 relocation = -tpoff (info, relocation); 3046 break; 3047 3048 /* Relocations for tls instructions. */ 3049 case R_390_TLS_LOAD: 3050 case R_390_TLS_GDCALL: 3051 case R_390_TLS_LDCALL: 3052 tls_type = GOT_UNKNOWN; 3053 if (h == NULL && local_got_offsets) 3054 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 3055 else if (h != NULL) 3056 tls_type = elf_s390_hash_entry(h)->tls_type; 3057 3058 if (tls_type == GOT_TLS_GD) 3059 continue; 3060 3061 if (r_type == R_390_TLS_LOAD) 3062 { 3063 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) 3064 { 3065 /* IE->LE transition. Four valid cases: 3066 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 3067 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 3068 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 3069 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 3070 unsigned int insn, ry; 3071 3072 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3073 if ((insn & 0xff00f000) == 0x58000000) 3074 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */ 3075 ry = (insn & 0x000f0000); 3076 else if ((insn & 0xff0f0000) == 0x58000000) 3077 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */ 3078 ry = (insn & 0x0000f000) << 4; 3079 else if ((insn & 0xff00f000) == 0x5800c000) 3080 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */ 3081 ry = (insn & 0x000f0000); 3082 else if ((insn & 0xff0f0000) == 0x580c0000) 3083 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 3084 ry = (insn & 0x0000f000) << 4; 3085 else 3086 { 3087 invalid_tls_insn (input_bfd, input_section, rel); 3088 return FALSE; 3089 } 3090 insn = 0x18000700 | (insn & 0x00f00000) | ry; 3091 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3092 } 3093 } 3094 else if (r_type == R_390_TLS_GDCALL) 3095 { 3096 unsigned int insn; 3097 3098 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3099 if ((insn & 0xff000fff) != 0x4d000000 && 3100 (insn & 0xffff0000) != 0xc0e50000 && 3101 (insn & 0xff000000) != 0x0d000000) 3102 { 3103 invalid_tls_insn (input_bfd, input_section, rel); 3104 return FALSE; 3105 } 3106 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) 3107 { 3108 if ((insn & 0xff000000) == 0x0d000000) 3109 { 3110 /* GD->LE transition. 3111 basr rx, ry -> nopr r7 */ 3112 insn = 0x07070000 | (insn & 0xffff); 3113 } 3114 else if ((insn & 0xff000000) == 0x4d000000) 3115 { 3116 /* GD->LE transition. 3117 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3118 insn = 0x47000000; 3119 } 3120 else 3121 { 3122 /* GD->LE transition. 3123 brasl %r14,_tls_get_offset@plt -> brcl 0,. */ 3124 insn = 0xc0040000; 3125 bfd_put_16 (output_bfd, 0x0000, 3126 contents + rel->r_offset + 4); 3127 } 3128 } 3129 else 3130 { 3131 /* If basr is used in the pic case to invoke 3132 _tls_get_offset, something went wrong before. */ 3133 if ((insn & 0xff000000) == 0x0d000000) 3134 { 3135 invalid_tls_insn (input_bfd, input_section, rel); 3136 return FALSE; 3137 } 3138 3139 if ((insn & 0xff000000) == 0x4d000000) 3140 { 3141 /* GD->IE transition. 3142 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */ 3143 insn = 0x5822c000; 3144 } 3145 else 3146 { 3147 /* GD->IE transition. 3148 brasl %r14,__tls_get_addr@plt -> 3149 l %r2,0(%r2,%r12) ; bcr 0,0 */ 3150 insn = 0x5822c000; 3151 bfd_put_16 (output_bfd, 0x0700, 3152 contents + rel->r_offset + 4); 3153 } 3154 } 3155 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3156 } 3157 else if (r_type == R_390_TLS_LDCALL) 3158 { 3159 if (!bfd_link_pic (info)) 3160 { 3161 unsigned int insn; 3162 3163 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3164 if ((insn & 0xff000fff) != 0x4d000000 && 3165 (insn & 0xffff0000) != 0xc0e50000 && 3166 (insn & 0xff000000) != 0x0d000000) 3167 { 3168 invalid_tls_insn (input_bfd, input_section, rel); 3169 return FALSE; 3170 } 3171 3172 if ((insn & 0xff000000) == 0x0d000000) 3173 { 3174 /* LD->LE transition. 3175 basr rx, ry -> nopr r7 */ 3176 insn = 0x07070000 | (insn & 0xffff); 3177 } 3178 else if ((insn & 0xff000000) == 0x4d000000) 3179 { 3180 /* LD->LE transition. 3181 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3182 insn = 0x47000000; 3183 } 3184 else 3185 { 3186 /* LD->LE transition. 3187 brasl %r14,__tls_get_offset@plt -> brcl 0,. */ 3188 insn = 0xc0040000; 3189 bfd_put_16 (output_bfd, 0x0000, 3190 contents + rel->r_offset + 4); 3191 } 3192 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3193 } 3194 } 3195 continue; 3196 3197 default: 3198 break; 3199 } 3200 3201 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3202 because such sections are not SEC_ALLOC and thus ld.so will 3203 not process them. */ 3204 if (unresolved_reloc 3205 && !((input_section->flags & SEC_DEBUGGING) != 0 3206 && h->def_dynamic) 3207 && _bfd_elf_section_offset (output_bfd, info, input_section, 3208 rel->r_offset) != (bfd_vma) -1) 3209 _bfd_error_handler 3210 /* xgettext:c-format */ 3211 (_("%pB(%pA+%#" PRIx64 "): " 3212 "unresolvable %s relocation against symbol `%s'"), 3213 input_bfd, 3214 input_section, 3215 (uint64_t) rel->r_offset, 3216 howto->name, 3217 h->root.root.string); 3218 3219 do_relocation: 3220 3221 /* When applying a 24 bit reloc we need to start one byte 3222 earlier. Otherwise the 32 bit get/put bfd operations might 3223 access a byte after the actual section. */ 3224 if (r_type == R_390_PC24DBL 3225 || r_type == R_390_PLT24DBL) 3226 rel->r_offset--; 3227 3228 if (r_type == R_390_20 3229 || r_type == R_390_GOT20 3230 || r_type == R_390_GOTPLT20 3231 || r_type == R_390_TLS_GOTIE20) 3232 { 3233 relocation += rel->r_addend; 3234 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3235 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3236 contents, rel->r_offset, 3237 relocation, 0); 3238 } 3239 else 3240 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3241 contents, rel->r_offset, 3242 relocation, rel->r_addend); 3243 3244 if (r != bfd_reloc_ok) 3245 { 3246 const char *name; 3247 3248 if (h != NULL) 3249 name = h->root.root.string; 3250 else 3251 { 3252 name = bfd_elf_string_from_elf_section (input_bfd, 3253 symtab_hdr->sh_link, 3254 sym->st_name); 3255 if (name == NULL) 3256 return FALSE; 3257 if (*name == '\0') 3258 name = bfd_section_name (input_bfd, sec); 3259 } 3260 3261 if (r == bfd_reloc_overflow) 3262 (*info->callbacks->reloc_overflow) 3263 (info, (h ? &h->root : NULL), name, howto->name, 3264 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3265 else 3266 { 3267 _bfd_error_handler 3268 /* xgettext:c-format */ 3269 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 3270 input_bfd, input_section, 3271 (uint64_t) rel->r_offset, name, (int) r); 3272 return FALSE; 3273 } 3274 } 3275 } 3276 3277 return TRUE; 3278 } 3279 3280 /* Generate the PLT slots together with the dynamic relocations needed 3281 for IFUNC symbols. */ 3282 3283 static void 3284 elf_s390_finish_ifunc_symbol (bfd *output_bfd, 3285 struct bfd_link_info *info, 3286 struct elf_link_hash_entry *h, 3287 struct elf_s390_link_hash_table *htab, 3288 bfd_vma iplt_offset, 3289 bfd_vma resolver_address) 3290 { 3291 bfd_vma iplt_index; 3292 bfd_vma got_offset; 3293 bfd_vma igotiplt_offset; 3294 Elf_Internal_Rela rela; 3295 bfd_byte *loc; 3296 asection *plt, *gotplt, *relplt; 3297 bfd_vma relative_offset; 3298 3299 if (htab->elf.iplt == NULL 3300 || htab->elf.igotplt == NULL 3301 || htab->elf.irelplt == NULL) 3302 abort (); 3303 3304 gotplt = htab->elf.igotplt; 3305 relplt = htab->elf.irelplt; 3306 3307 /* Index of the PLT slot within iplt section. */ 3308 iplt_index = iplt_offset / PLT_ENTRY_SIZE; 3309 plt = htab->elf.iplt; 3310 /* Offset into the igot.plt section. */ 3311 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE; 3312 /* Offset into the got section. */ 3313 got_offset = igotiplt_offset + gotplt->output_offset; 3314 3315 /* S390 uses halfwords for relative branch calc! */ 3316 relative_offset = - (plt->output_offset + 3317 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2; 3318 /* If offset is > 32768, branch to a previous branch 3319 390 can only handle +-64 K jumps. */ 3320 if ( -32768 > (int) relative_offset ) 3321 relative_offset 3322 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3323 3324 /* Fill in the entry in the procedure linkage table. */ 3325 if (!bfd_link_pic (info)) 3326 { 3327 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry, 3328 PLT_ENTRY_SIZE); 3329 3330 /* Adjust jump to the first plt entry. */ 3331 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3332 plt->contents + iplt_offset + 20); 3333 3334 /* Push the GOT offset field. */ 3335 bfd_put_32 (output_bfd, 3336 (gotplt->output_section->vma 3337 + got_offset), 3338 plt->contents + iplt_offset + 24); 3339 } 3340 else if (got_offset < 4096) 3341 { 3342 /* The GOT offset is small enough to be used directly as 3343 displacement. */ 3344 memcpy (plt->contents + iplt_offset, 3345 elf_s390_plt_pic12_entry, 3346 PLT_ENTRY_SIZE); 3347 3348 /* Put in the GOT offset as displacement value. The 0xc000 3349 value comes from the first word of the plt entry. Look 3350 at the elf_s390_plt_pic16_entry content. */ 3351 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3352 plt->contents + iplt_offset + 2); 3353 3354 /* Adjust the jump to the first plt entry. */ 3355 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3356 plt->contents + iplt_offset + 20); 3357 } 3358 else if (got_offset < 32768) 3359 { 3360 /* The GOT offset is too big for a displacement but small 3361 enough to be a signed 16 bit immediate value as it can be 3362 used in an lhi instruction. */ 3363 memcpy (plt->contents + iplt_offset, 3364 elf_s390_plt_pic16_entry, 3365 PLT_ENTRY_SIZE); 3366 3367 /* Put in the GOT offset for the lhi instruction. */ 3368 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3369 plt->contents + iplt_offset + 2); 3370 3371 /* Adjust the jump to the first plt entry. */ 3372 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3373 plt->contents + iplt_offset + 20); 3374 } 3375 else 3376 { 3377 memcpy (plt->contents + iplt_offset, 3378 elf_s390_plt_pic_entry, 3379 PLT_ENTRY_SIZE); 3380 3381 /* Adjust the jump to the first plt entry. */ 3382 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3383 plt->contents + iplt_offset + 20); 3384 3385 /* Push the GOT offset field. */ 3386 bfd_put_32 (output_bfd, got_offset, 3387 plt->contents + iplt_offset + 24); 3388 } 3389 /* Insert offset into reloc. table here. */ 3390 bfd_put_32 (output_bfd, relplt->output_offset + 3391 iplt_index * RELA_ENTRY_SIZE, 3392 plt->contents + iplt_offset + 28); 3393 3394 /* Fill in the entry in the global offset table. 3395 Points to instruction after GOT offset. */ 3396 bfd_put_32 (output_bfd, 3397 (plt->output_section->vma 3398 + plt->output_offset 3399 + iplt_offset 3400 + 12), 3401 gotplt->contents + igotiplt_offset); 3402 3403 /* Fill in the entry in the .rela.plt section. */ 3404 rela.r_offset = gotplt->output_section->vma + got_offset; 3405 3406 if (!h 3407 || h->dynindx == -1 3408 || ((bfd_link_executable (info) 3409 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3410 && h->def_regular)) 3411 { 3412 /* The symbol can be locally resolved. */ 3413 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 3414 rela.r_addend = resolver_address; 3415 } 3416 else 3417 { 3418 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3419 rela.r_addend = 0; 3420 } 3421 3422 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE; 3423 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3424 } 3425 3426 /* Finish up dynamic symbol handling. We set the contents of various 3427 dynamic sections here. */ 3428 3429 static bfd_boolean 3430 elf_s390_finish_dynamic_symbol (bfd *output_bfd, 3431 struct bfd_link_info *info, 3432 struct elf_link_hash_entry *h, 3433 Elf_Internal_Sym *sym) 3434 { 3435 struct elf_s390_link_hash_table *htab; 3436 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; 3437 3438 htab = elf_s390_hash_table (info); 3439 3440 if (h->plt.offset != (bfd_vma) -1) 3441 { 3442 bfd_vma plt_index; 3443 bfd_vma got_offset; 3444 Elf_Internal_Rela rela; 3445 bfd_byte *loc; 3446 bfd_vma relative_offset; 3447 3448 /* This symbol has an entry in the procedure linkage table. Set 3449 it up. */ 3450 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 3451 { 3452 elf_s390_finish_ifunc_symbol (output_bfd, info, h, 3453 htab, h->plt.offset, 3454 eh->ifunc_resolver_address + 3455 eh->ifunc_resolver_section->output_offset + 3456 eh->ifunc_resolver_section->output_section->vma); 3457 /* Do not return yet. Handling of explicit GOT slots of 3458 IFUNC symbols is below. */ 3459 } 3460 else 3461 { 3462 if (h->dynindx == -1 3463 || htab->elf.splt == NULL 3464 || htab->elf.sgotplt == NULL 3465 || htab->elf.srelplt == NULL) 3466 abort (); 3467 3468 /* Calc. index no. 3469 Current offset - size first entry / entry size. */ 3470 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3471 3472 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 3473 addr & GOT addr. */ 3474 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3475 3476 /* S390 uses halfwords for relative branch calc! */ 3477 relative_offset = - ((PLT_FIRST_ENTRY_SIZE + 3478 (PLT_ENTRY_SIZE * plt_index) + 18) / 2); 3479 /* If offset is > 32768, branch to a previous branch 3480 390 can only handle +-64 K jumps. */ 3481 if ( -32768 > (int) relative_offset ) 3482 relative_offset 3483 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3484 3485 /* Fill in the entry in the procedure linkage table. */ 3486 if (!bfd_link_pic (info)) 3487 { 3488 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry, 3489 PLT_ENTRY_SIZE); 3490 3491 /* Adjust jump to the first plt entry. */ 3492 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3493 htab->elf.splt->contents + h->plt.offset + 20); 3494 3495 /* Push the GOT offset field. */ 3496 bfd_put_32 (output_bfd, 3497 (htab->elf.sgotplt->output_section->vma 3498 + htab->elf.sgotplt->output_offset 3499 + got_offset), 3500 htab->elf.splt->contents + h->plt.offset + 24); 3501 } 3502 else if (got_offset < 4096) 3503 { 3504 /* The GOT offset is small enough to be used directly as 3505 displacement. */ 3506 memcpy (htab->elf.splt->contents + h->plt.offset, 3507 elf_s390_plt_pic12_entry, 3508 PLT_ENTRY_SIZE); 3509 3510 /* Put in the GOT offset as displacement value. The 0xc000 3511 value comes from the first word of the plt entry. Look 3512 at the elf_s390_plt_pic12_entry content. */ 3513 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3514 htab->elf.splt->contents + h->plt.offset + 2); 3515 3516 /* Adjust the jump to the first plt entry. */ 3517 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3518 htab->elf.splt->contents + h->plt.offset + 20); 3519 } 3520 else if (got_offset < 32768) 3521 { 3522 /* The GOT offset is too big for a displacement but small 3523 enough to be a signed 16 bit immediate value as it can be 3524 used in an lhi instruction. */ 3525 memcpy (htab->elf.splt->contents + h->plt.offset, 3526 elf_s390_plt_pic16_entry, 3527 PLT_ENTRY_SIZE); 3528 3529 /* Put in the GOT offset for the lhi instruction. */ 3530 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3531 htab->elf.splt->contents + h->plt.offset + 2); 3532 3533 /* Adjust the jump to the first plt entry. */ 3534 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3535 htab->elf.splt->contents + h->plt.offset + 20); 3536 } 3537 else 3538 { 3539 memcpy (htab->elf.splt->contents + h->plt.offset, 3540 elf_s390_plt_pic_entry, 3541 PLT_ENTRY_SIZE); 3542 3543 /* Adjust the jump to the first plt entry. */ 3544 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3545 htab->elf.splt->contents + h->plt.offset + 20); 3546 3547 /* Push the GOT offset field. */ 3548 bfd_put_32 (output_bfd, got_offset, 3549 htab->elf.splt->contents + h->plt.offset + 24); 3550 } 3551 /* Insert offset into reloc. table here. */ 3552 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 3553 htab->elf.splt->contents + h->plt.offset + 28); 3554 3555 /* Fill in the entry in the global offset table. 3556 Points to instruction after GOT offset. */ 3557 bfd_put_32 (output_bfd, 3558 (htab->elf.splt->output_section->vma 3559 + htab->elf.splt->output_offset 3560 + h->plt.offset 3561 + 12), 3562 htab->elf.sgotplt->contents + got_offset); 3563 3564 /* Fill in the entry in the .rela.plt section. */ 3565 rela.r_offset = (htab->elf.sgotplt->output_section->vma 3566 + htab->elf.sgotplt->output_offset 3567 + got_offset); 3568 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3569 rela.r_addend = 0; 3570 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela); 3571 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3572 3573 if (!h->def_regular) 3574 { 3575 /* Mark the symbol as undefined, rather than as defined in 3576 the .plt section. Leave the value alone. This is a clue 3577 for the dynamic linker, to make function pointer 3578 comparisons work between an application and shared 3579 library. */ 3580 sym->st_shndx = SHN_UNDEF; 3581 } 3582 } 3583 } 3584 3585 if (h->got.offset != (bfd_vma) -1 3586 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3587 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3588 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3589 { 3590 Elf_Internal_Rela rela; 3591 bfd_byte *loc; 3592 3593 /* This symbol has an entry in the global offset table. Set it 3594 up. */ 3595 3596 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3597 abort (); 3598 3599 rela.r_offset = (htab->elf.sgot->output_section->vma 3600 + htab->elf.sgot->output_offset 3601 + (h->got.offset &~ (bfd_vma) 1)); 3602 3603 /* If this is a static link, or it is a -Bsymbolic link and the 3604 symbol is defined locally or was forced to be local because 3605 of a version file, we just want to emit a RELATIVE reloc. 3606 The entry in the global offset table will already have been 3607 initialized in the relocate_section function. */ 3608 if (h->def_regular && s390_is_ifunc_symbol_p (h)) 3609 { 3610 if (bfd_link_pic (info)) 3611 { 3612 /* An explicit GOT slot usage needs GLOB_DAT. If the 3613 symbol references local the implicit got.iplt slot 3614 will be used and the IRELATIVE reloc has been created 3615 above. */ 3616 goto do_glob_dat; 3617 } 3618 else 3619 { 3620 /* For non-shared objects explicit GOT slots must be 3621 filled with the PLT slot address for pointer 3622 equality reasons. */ 3623 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma 3624 + htab->elf.iplt->output_offset 3625 + h->plt.offset), 3626 htab->elf.sgot->contents + h->got.offset); 3627 return TRUE; 3628 } 3629 } 3630 else if (bfd_link_pic (info) 3631 && SYMBOL_REFERENCES_LOCAL (info, h)) 3632 { 3633 /* If this is a static link, or it is a -Bsymbolic link and 3634 the symbol is defined locally or was forced to be local 3635 because of a version file, we just want to emit a 3636 RELATIVE reloc. The entry in the global offset table 3637 will already have been initialized in the 3638 relocate_section function. */ 3639 if (!(h->def_regular || ELF_COMMON_DEF_P (h))) 3640 return FALSE; 3641 BFD_ASSERT((h->got.offset & 1) != 0); 3642 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 3643 rela.r_addend = (h->root.u.def.value 3644 + h->root.u.def.section->output_section->vma 3645 + h->root.u.def.section->output_offset); 3646 } 3647 else 3648 { 3649 BFD_ASSERT((h->got.offset & 1) == 0); 3650 do_glob_dat: 3651 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset); 3652 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT); 3653 rela.r_addend = 0; 3654 } 3655 3656 loc = htab->elf.srelgot->contents; 3657 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3658 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3659 } 3660 3661 if (h->needs_copy) 3662 { 3663 Elf_Internal_Rela rela; 3664 asection *s; 3665 bfd_byte *loc; 3666 3667 /* This symbols needs a copy reloc. Set it up. */ 3668 3669 if (h->dynindx == -1 3670 || (h->root.type != bfd_link_hash_defined 3671 && h->root.type != bfd_link_hash_defweak) 3672 || htab->elf.srelbss == NULL 3673 || htab->elf.sreldynrelro == NULL) 3674 abort (); 3675 3676 rela.r_offset = (h->root.u.def.value 3677 + h->root.u.def.section->output_section->vma 3678 + h->root.u.def.section->output_offset); 3679 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY); 3680 rela.r_addend = 0; 3681 if (h->root.u.def.section == htab->elf.sdynrelro) 3682 s = htab->elf.sreldynrelro; 3683 else 3684 s = htab->elf.srelbss; 3685 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 3686 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3687 } 3688 3689 /* Mark some specially defined symbols as absolute. */ 3690 if (h == htab->elf.hdynamic 3691 || h == htab->elf.hgot 3692 || h == htab->elf.hplt) 3693 sym->st_shndx = SHN_ABS; 3694 3695 return TRUE; 3696 } 3697 3698 /* Used to decide how to sort relocs in an optimal manner for the 3699 dynamic linker, before writing them out. */ 3700 3701 static enum elf_reloc_type_class 3702 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3703 const asection *rel_sec ATTRIBUTE_UNUSED, 3704 const Elf_Internal_Rela *rela) 3705 { 3706 bfd *abfd = info->output_bfd; 3707 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3708 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); 3709 unsigned long r_symndx = ELF32_R_SYM (rela->r_info); 3710 Elf_Internal_Sym sym; 3711 3712 if (htab->elf.dynsym == NULL 3713 || !bed->s->swap_symbol_in (abfd, 3714 (htab->elf.dynsym->contents 3715 + r_symndx * bed->s->sizeof_sym), 3716 0, &sym)) 3717 abort (); 3718 3719 /* Check relocation against STT_GNU_IFUNC symbol. */ 3720 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 3721 return reloc_class_ifunc; 3722 3723 switch ((int) ELF32_R_TYPE (rela->r_info)) 3724 { 3725 case R_390_RELATIVE: 3726 return reloc_class_relative; 3727 case R_390_JMP_SLOT: 3728 return reloc_class_plt; 3729 case R_390_COPY: 3730 return reloc_class_copy; 3731 default: 3732 return reloc_class_normal; 3733 } 3734 } 3735 3736 /* Finish up the dynamic sections. */ 3737 3738 static bfd_boolean 3739 elf_s390_finish_dynamic_sections (bfd *output_bfd, 3740 struct bfd_link_info *info) 3741 { 3742 struct elf_s390_link_hash_table *htab; 3743 bfd *dynobj; 3744 asection *sdyn; 3745 bfd *ibfd; 3746 unsigned int i; 3747 3748 htab = elf_s390_hash_table (info); 3749 dynobj = htab->elf.dynobj; 3750 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3751 3752 if (htab->elf.dynamic_sections_created) 3753 { 3754 Elf32_External_Dyn *dyncon, *dynconend; 3755 3756 if (sdyn == NULL || htab->elf.sgot == NULL) 3757 abort (); 3758 3759 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3760 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3761 for (; dyncon < dynconend; dyncon++) 3762 { 3763 Elf_Internal_Dyn dyn; 3764 asection *s; 3765 3766 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3767 3768 switch (dyn.d_tag) 3769 { 3770 default: 3771 continue; 3772 3773 case DT_PLTGOT: 3774 s = htab->elf.sgotplt; 3775 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3776 break; 3777 3778 case DT_JMPREL: 3779 s = htab->elf.srelplt; 3780 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3781 break; 3782 3783 case DT_PLTRELSZ: 3784 dyn.d_un.d_val = htab->elf.srelplt->size; 3785 if (htab->elf.irelplt) 3786 dyn.d_un.d_val += htab->elf.irelplt->size; 3787 break; 3788 } 3789 3790 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3791 } 3792 3793 /* Fill in the special first entry in the procedure linkage table. */ 3794 if (htab->elf.splt && htab->elf.splt->size > 0) 3795 { 3796 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE); 3797 if (bfd_link_pic (info)) 3798 { 3799 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry, 3800 PLT_FIRST_ENTRY_SIZE); 3801 } 3802 else 3803 { 3804 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry, 3805 PLT_FIRST_ENTRY_SIZE); 3806 bfd_put_32 (output_bfd, 3807 htab->elf.sgotplt->output_section->vma 3808 + htab->elf.sgotplt->output_offset, 3809 htab->elf.splt->contents + 24); 3810 } 3811 elf_section_data (htab->elf.splt->output_section) 3812 ->this_hdr.sh_entsize = 4; 3813 } 3814 3815 } 3816 3817 if (htab->elf.sgotplt) 3818 { 3819 /* Fill in the first three entries in the global offset table. */ 3820 if (htab->elf.sgotplt->size > 0) 3821 { 3822 bfd_put_32 (output_bfd, 3823 (sdyn == NULL ? (bfd_vma) 0 3824 : sdyn->output_section->vma + sdyn->output_offset), 3825 htab->elf.sgotplt->contents); 3826 /* One entry for shared object struct ptr. */ 3827 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4); 3828 /* One entry for _dl_runtime_resolve. */ 3829 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8); 3830 } 3831 3832 elf_section_data (htab->elf.sgotplt->output_section) 3833 ->this_hdr.sh_entsize = 4; 3834 } 3835 /* Finish dynamic symbol for local IFUNC symbols. */ 3836 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 3837 { 3838 struct plt_entry *local_plt; 3839 Elf_Internal_Sym *isym; 3840 Elf_Internal_Shdr *symtab_hdr; 3841 3842 symtab_hdr = &elf_symtab_hdr (ibfd); 3843 3844 if (!is_s390_elf (ibfd)) 3845 continue; 3846 3847 local_plt = elf_s390_local_plt (ibfd); 3848 if (local_plt != NULL) 3849 for (i = 0; i < symtab_hdr->sh_info; i++) 3850 { 3851 if (local_plt[i].plt.offset != (bfd_vma) -1) 3852 { 3853 asection *sec = local_plt[i].sec; 3854 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i); 3855 if (isym == NULL) 3856 return FALSE; 3857 3858 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 3859 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab, 3860 local_plt[i].plt.offset, 3861 isym->st_value 3862 + sec->output_section->vma 3863 + sec->output_offset); 3864 3865 } 3866 } 3867 } 3868 return TRUE; 3869 } 3870 3871 /* Support for core dump NOTE sections. */ 3872 3873 static bfd_boolean 3874 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note) 3875 { 3876 int offset; 3877 unsigned int size; 3878 3879 switch (note->descsz) 3880 { 3881 default: 3882 return FALSE; 3883 3884 case 224: /* S/390 Linux. */ 3885 /* pr_cursig */ 3886 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 3887 3888 /* pr_pid */ 3889 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 3890 3891 /* pr_reg */ 3892 offset = 72; 3893 size = 144; 3894 break; 3895 } 3896 3897 /* Make a ".reg/999" section. */ 3898 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3899 size, note->descpos + offset); 3900 } 3901 3902 static bfd_boolean 3903 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 3904 { 3905 switch (note->descsz) 3906 { 3907 default: 3908 return FALSE; 3909 3910 case 124: /* sizeof(struct elf_prpsinfo) on s390 */ 3911 elf_tdata (abfd)->core->pid 3912 = bfd_get_32 (abfd, note->descdata + 12); 3913 elf_tdata (abfd)->core->program 3914 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 3915 elf_tdata (abfd)->core->command 3916 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 3917 break; 3918 } 3919 3920 /* Note that for some reason, a spurious space is tacked 3921 onto the end of the args in some (at least one anyway) 3922 implementations, so strip it off if it exists. */ 3923 3924 { 3925 char *command = elf_tdata (abfd)->core->command; 3926 int n = strlen (command); 3927 3928 if (0 < n && command[n - 1] == ' ') 3929 command[n - 1] = '\0'; 3930 } 3931 3932 return TRUE; 3933 } 3934 3935 static char * 3936 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz, 3937 int note_type, ...) 3938 { 3939 va_list ap; 3940 3941 switch (note_type) 3942 { 3943 default: 3944 return NULL; 3945 3946 case NT_PRPSINFO: 3947 { 3948 char data[124] ATTRIBUTE_NONSTRING = { 0 }; 3949 const char *fname, *psargs; 3950 3951 va_start (ap, note_type); 3952 fname = va_arg (ap, const char *); 3953 psargs = va_arg (ap, const char *); 3954 va_end (ap); 3955 3956 strncpy (data + 28, fname, 16); 3957 #if GCC_VERSION == 8000 || GCC_VERSION == 8001 3958 DIAGNOSTIC_PUSH; 3959 /* GCC 8.0 and 8.1 warn about 80 equals destination size with 3960 -Wstringop-truncation: 3961 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643 3962 */ 3963 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION; 3964 #endif 3965 strncpy (data + 44, psargs, 80); 3966 #if GCC_VERSION == 8000 || GCC_VERSION == 8001 3967 DIAGNOSTIC_POP; 3968 #endif 3969 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3970 &data, sizeof (data)); 3971 } 3972 3973 case NT_PRSTATUS: 3974 { 3975 char data[224] = { 0 }; 3976 long pid; 3977 int cursig; 3978 const void *gregs; 3979 3980 va_start (ap, note_type); 3981 pid = va_arg (ap, long); 3982 cursig = va_arg (ap, int); 3983 gregs = va_arg (ap, const void *); 3984 va_end (ap); 3985 3986 bfd_put_16 (abfd, cursig, data + 12); 3987 bfd_put_32 (abfd, pid, data + 24); 3988 memcpy (data + 72, gregs, 144); 3989 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3990 &data, sizeof (data)); 3991 } 3992 } 3993 /* NOTREACHED */ 3994 } 3995 3996 /* Return address for Ith PLT stub in section PLT, for relocation REL 3997 or (bfd_vma) -1 if it should not be included. */ 3998 3999 static bfd_vma 4000 elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 4001 const arelent *rel ATTRIBUTE_UNUSED) 4002 { 4003 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 4004 } 4005 4006 /* Merge backend specific data from an object file to the output 4007 object file when linking. */ 4008 4009 static bfd_boolean 4010 elf32_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 4011 { 4012 bfd *obfd = info->output_bfd; 4013 4014 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd)) 4015 return TRUE; 4016 4017 if (!elf_s390_merge_obj_attributes (ibfd, info)) 4018 return FALSE; 4019 4020 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags; 4021 return TRUE; 4022 } 4023 4024 4025 #define TARGET_BIG_SYM s390_elf32_vec 4026 #define TARGET_BIG_NAME "elf32-s390" 4027 #define ELF_ARCH bfd_arch_s390 4028 #define ELF_TARGET_ID S390_ELF_DATA 4029 #define ELF_MACHINE_CODE EM_S390 4030 #define ELF_MACHINE_ALT1 EM_S390_OLD 4031 #define ELF_MAXPAGESIZE 0x1000 4032 4033 #define elf_backend_can_gc_sections 1 4034 #define elf_backend_can_refcount 1 4035 #define elf_backend_want_got_plt 1 4036 #define elf_backend_plt_readonly 1 4037 #define elf_backend_want_plt_sym 0 4038 #define elf_backend_got_header_size 12 4039 #define elf_backend_want_dynrelro 1 4040 #define elf_backend_rela_normal 1 4041 4042 #define elf_info_to_howto elf_s390_info_to_howto 4043 4044 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name 4045 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create 4046 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 4047 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 4048 4049 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data 4050 4051 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 4052 #define elf_backend_check_relocs elf_s390_check_relocs 4053 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 4054 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 4055 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 4056 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 4057 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 4058 #define elf_backend_reloc_type_class elf_s390_reloc_type_class 4059 #define elf_backend_relocate_section elf_s390_relocate_section 4060 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 4061 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4062 #define elf_backend_grok_prstatus elf_s390_grok_prstatus 4063 #define elf_backend_grok_psinfo elf_s390_grok_psinfo 4064 #define elf_backend_write_core_note elf_s390_write_core_note 4065 #define elf_backend_plt_sym_val elf_s390_plt_sym_val 4066 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p 4067 4068 #define bfd_elf32_mkobject elf_s390_mkobject 4069 #define elf_backend_object_p elf_s390_object_p 4070 4071 #define elf_backend_linux_prpsinfo32_ugid16 TRUE 4072 4073 #include "elf32-target.h" 4074