elf32-s390.c revision 1.1.1.9
1 /* IBM S/390-specific support for 32-bit ELF 2 Copyright (C) 2000-2024 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 0, /* size */ 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, 1, 8, false, 0, complain_overflow_bitfield, 56 bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false), 57 HOWTO(R_390_12, 0, 2, 12, false, 0, complain_overflow_dont, 58 bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false), 59 HOWTO(R_390_16, 0, 2, 16, false, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false), 61 HOWTO(R_390_32, 0, 4, 32, false, 0, complain_overflow_bitfield, 62 bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false), 63 HOWTO(R_390_PC32, 0, 4, 32, true, 0, complain_overflow_bitfield, 64 bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true), 65 HOWTO(R_390_GOT12, 0, 2, 12, false, 0, complain_overflow_bitfield, 66 bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false), 67 HOWTO(R_390_GOT32, 0, 4, 32, false, 0, complain_overflow_bitfield, 68 bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false), 69 HOWTO(R_390_PLT32, 0, 4, 32, true, 0, complain_overflow_bitfield, 70 bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true), 71 HOWTO(R_390_COPY, 0, 4, 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, 4, 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, 4, 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, 4, 32, true, 0, complain_overflow_bitfield, 78 bfd_elf_generic_reloc, "R_390_RELATIVE", false, 0,0xffffffff, false), 79 HOWTO(R_390_GOTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield, 80 bfd_elf_generic_reloc, "R_390_GOTOFF32", false, 0,0xffffffff, false), 81 HOWTO(R_390_GOTPC, 0, 4, 32, true, 0, complain_overflow_bitfield, 82 bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true), 83 HOWTO(R_390_GOT16, 0, 2, 16, false, 0, complain_overflow_bitfield, 84 bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false), 85 HOWTO(R_390_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true), 87 HOWTO(R_390_PC16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield, 88 bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true), 89 HOWTO(R_390_PLT16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield, 90 bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true), 91 HOWTO(R_390_PC32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true), 93 HOWTO(R_390_PLT32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield, 94 bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true), 95 HOWTO(R_390_GOTPCDBL, 1, 4, 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, 4, 32, true, 0, complain_overflow_bitfield, 102 bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,0xffffffff, true), 103 HOWTO(R_390_GOTOFF16, 0, 2, 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, 2, 12, false, 0, complain_overflow_dont, 107 bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false), 108 HOWTO(R_390_GOTPLT16, 0, 2, 16, false, 0, complain_overflow_bitfield, 109 bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false), 110 HOWTO(R_390_GOTPLT32, 0, 4, 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, 4, 32, true, 0, complain_overflow_bitfield, 114 bfd_elf_generic_reloc, "R_390_GOTPLTENT",false, 0,0xffffffff, true), 115 HOWTO(R_390_PLTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield, 116 bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false), 117 HOWTO(R_390_PLTOFF32, 0, 4, 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, 4, 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, 2, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 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, 4, 20, false, 8, complain_overflow_dont, 155 s390_elf_ldisp_reloc, "R_390_20", false, 0,0x0fffff00, false), 156 HOWTO(R_390_GOT20, 0, 4, 20, false, 8, complain_overflow_dont, 157 s390_elf_ldisp_reloc, "R_390_GOT20", false, 0,0x0fffff00, false), 158 HOWTO(R_390_GOTPLT20, 0, 4, 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, 4, 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, 4, 32, true, 0, complain_overflow_bitfield, 163 bfd_elf_generic_reloc, "R_390_IRELATIVE", false, 0, 0xffffffff, false), 164 HOWTO(R_390_PC12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield, 165 bfd_elf_generic_reloc, "R_390_PC12DBL", false, 0,0x00000fff, true), 166 HOWTO(R_390_PLT12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield, 167 bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true), 168 HOWTO(R_390_PC24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield, 169 bfd_elf_generic_reloc, "R_390_PC24DBL", false, 0,0x00ffffff, true), 170 HOWTO(R_390_PLT24DBL, 1, 4, 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, 0,4,0,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, 0,4,0,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 bool 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 bool 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 /* Number of GOTPLT references for a function. */ 658 bfd_signed_vma gotplt_refcount; 659 660 #define GOT_UNKNOWN 0 661 #define GOT_NORMAL 1 662 #define GOT_TLS_GD 2 663 #define GOT_TLS_IE 3 664 #define GOT_TLS_IE_NLT 4 665 unsigned char tls_type; 666 667 /* For pointer equality reasons we might need to change the symbol 668 type from STT_GNU_IFUNC to STT_FUNC together with its value and 669 section entry. So after alloc_dynrelocs only these values should 670 be used. In order to check whether a symbol is IFUNC use 671 s390_is_ifunc_symbol_p. */ 672 bfd_vma ifunc_resolver_address; 673 asection *ifunc_resolver_section; 674 }; 675 676 #define elf_s390_hash_entry(ent) \ 677 ((struct elf_s390_link_hash_entry *)(ent)) 678 679 /* This structure represents an entry in the local PLT list needed for 680 local IFUNC symbols. */ 681 struct plt_entry 682 { 683 /* The section of the local symbol. 684 Set in relocate_section and used in finish_dynamic_sections. */ 685 asection *sec; 686 687 union 688 { 689 bfd_signed_vma refcount; 690 bfd_vma offset; 691 } plt; 692 }; 693 694 /* NOTE: Keep this structure in sync with 695 the one declared in elf64-s390.c. */ 696 struct elf_s390_obj_tdata 697 { 698 struct elf_obj_tdata root; 699 700 /* A local PLT is needed for ifunc symbols. */ 701 struct plt_entry *local_plt; 702 703 /* TLS type for each local got entry. */ 704 char *local_got_tls_type; 705 }; 706 707 #define elf_s390_tdata(abfd) \ 708 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 709 710 #define elf_s390_local_plt(abfd) \ 711 (elf_s390_tdata (abfd)->local_plt) 712 713 #define elf_s390_local_got_tls_type(abfd) \ 714 (elf_s390_tdata (abfd)->local_got_tls_type) 715 716 #define is_s390_elf(bfd) \ 717 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 718 && elf_tdata (bfd) != NULL \ 719 && elf_object_id (bfd) == S390_ELF_DATA) 720 721 static bool 722 elf_s390_mkobject (bfd *abfd) 723 { 724 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata), 725 S390_ELF_DATA); 726 } 727 728 static bool 729 elf_s390_object_p (bfd *abfd) 730 { 731 /* Set the right machine number for an s390 elf32 file. */ 732 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31); 733 } 734 735 /* s390 ELF linker hash table. */ 736 737 struct elf_s390_link_hash_table 738 { 739 struct elf_link_hash_table elf; 740 741 /* Short-cuts to get to dynamic linker sections. */ 742 asection *irelifunc; 743 744 union 745 { 746 bfd_signed_vma refcount; 747 bfd_vma offset; 748 } tls_ldm_got; 749 }; 750 751 /* Get the s390 ELF linker hash table from a link_info structure. */ 752 753 #define elf_s390_hash_table(p) \ 754 ((is_elf_hash_table ((p)->hash) \ 755 && elf_hash_table_id (elf_hash_table (p)) == S390_ELF_DATA) \ 756 ? (struct elf_s390_link_hash_table *) (p)->hash : NULL) 757 758 #undef ELF64 759 #include "elf-s390-common.c" 760 761 /* Create an entry in an s390 ELF linker hash table. */ 762 763 static struct bfd_hash_entry * 764 link_hash_newfunc (struct bfd_hash_entry *entry, 765 struct bfd_hash_table *table, 766 const char *string) 767 { 768 /* Allocate the structure if it has not already been allocated by a 769 subclass. */ 770 if (entry == NULL) 771 { 772 entry = bfd_hash_allocate (table, 773 sizeof (struct elf_s390_link_hash_entry)); 774 if (entry == NULL) 775 return entry; 776 } 777 778 /* Call the allocation method of the superclass. */ 779 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 780 if (entry != NULL) 781 { 782 struct elf_s390_link_hash_entry *eh; 783 784 eh = (struct elf_s390_link_hash_entry *) entry; 785 eh->gotplt_refcount = 0; 786 eh->tls_type = GOT_UNKNOWN; 787 eh->ifunc_resolver_address = 0; 788 eh->ifunc_resolver_section = NULL; 789 } 790 791 return entry; 792 } 793 794 /* Create an s390 ELF linker hash table. */ 795 796 static struct bfd_link_hash_table * 797 elf_s390_link_hash_table_create (bfd *abfd) 798 { 799 struct elf_s390_link_hash_table *ret; 800 size_t amt = sizeof (struct elf_s390_link_hash_table); 801 802 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt); 803 if (ret == NULL) 804 return NULL; 805 806 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 807 sizeof (struct elf_s390_link_hash_entry), 808 S390_ELF_DATA)) 809 { 810 free (ret); 811 return NULL; 812 } 813 814 return &ret->elf.root; 815 } 816 817 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 818 819 static void 820 elf_s390_copy_indirect_symbol (struct bfd_link_info *info, 821 struct elf_link_hash_entry *dir, 822 struct elf_link_hash_entry *ind) 823 { 824 struct elf_s390_link_hash_entry *edir, *eind; 825 826 edir = (struct elf_s390_link_hash_entry *) dir; 827 eind = (struct elf_s390_link_hash_entry *) ind; 828 829 if (ind->root.type == bfd_link_hash_indirect 830 && dir->got.refcount <= 0) 831 { 832 edir->tls_type = eind->tls_type; 833 eind->tls_type = GOT_UNKNOWN; 834 } 835 836 if (ELIMINATE_COPY_RELOCS 837 && ind->root.type != bfd_link_hash_indirect 838 && dir->dynamic_adjusted) 839 { 840 /* If called to transfer flags for a weakdef during processing 841 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 842 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 843 if (dir->versioned != versioned_hidden) 844 dir->ref_dynamic |= ind->ref_dynamic; 845 dir->ref_regular |= ind->ref_regular; 846 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 847 dir->needs_plt |= ind->needs_plt; 848 } 849 else 850 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 851 } 852 853 static int 854 elf_s390_tls_transition (struct bfd_link_info *info, 855 int r_type, 856 int is_local) 857 { 858 if (bfd_link_pic (info)) 859 return r_type; 860 861 switch (r_type) 862 { 863 case R_390_TLS_GD32: 864 case R_390_TLS_IE32: 865 if (is_local) 866 return R_390_TLS_LE32; 867 return R_390_TLS_IE32; 868 case R_390_TLS_GOTIE32: 869 if (is_local) 870 return R_390_TLS_LE32; 871 return R_390_TLS_GOTIE32; 872 case R_390_TLS_LDM32: 873 return R_390_TLS_LE32; 874 } 875 876 return r_type; 877 } 878 879 /* Look through the relocs for a section during the first phase, and 880 allocate space in the global offset table or procedure linkage 881 table. */ 882 883 static bool 884 elf_s390_check_relocs (bfd *abfd, 885 struct bfd_link_info *info, 886 asection *sec, 887 const Elf_Internal_Rela *relocs) 888 { 889 struct elf_s390_link_hash_table *htab; 890 Elf_Internal_Shdr *symtab_hdr; 891 struct elf_link_hash_entry **sym_hashes; 892 const Elf_Internal_Rela *rel; 893 const Elf_Internal_Rela *rel_end; 894 asection *sreloc; 895 bfd_signed_vma *local_got_refcounts; 896 int tls_type, old_tls_type; 897 Elf_Internal_Sym *isym; 898 899 if (bfd_link_relocatable (info)) 900 return true; 901 902 BFD_ASSERT (is_s390_elf (abfd)); 903 904 htab = elf_s390_hash_table (info); 905 symtab_hdr = &elf_symtab_hdr (abfd); 906 sym_hashes = elf_sym_hashes (abfd); 907 local_got_refcounts = elf_local_got_refcounts (abfd); 908 909 sreloc = NULL; 910 911 rel_end = relocs + sec->reloc_count; 912 for (rel = relocs; rel < rel_end; rel++) 913 { 914 unsigned int r_type; 915 unsigned int r_symndx; 916 struct elf_link_hash_entry *h; 917 918 r_symndx = ELF32_R_SYM (rel->r_info); 919 920 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 921 { 922 /* xgettext:c-format */ 923 _bfd_error_handler (_("%pB: bad symbol index: %d"), 924 abfd, r_symndx); 925 return false; 926 } 927 928 if (r_symndx < symtab_hdr->sh_info) 929 { 930 /* A local symbol. */ 931 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 932 abfd, r_symndx); 933 if (isym == NULL) 934 return false; 935 936 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 937 { 938 struct plt_entry *plt; 939 940 if (htab->elf.dynobj == NULL) 941 htab->elf.dynobj = abfd; 942 943 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 944 return false; 945 946 if (local_got_refcounts == NULL) 947 { 948 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 949 return false; 950 local_got_refcounts = elf_local_got_refcounts (abfd); 951 } 952 plt = elf_s390_local_plt (abfd); 953 plt[r_symndx].plt.refcount++; 954 } 955 h = NULL; 956 } 957 else 958 { 959 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 960 while (h->root.type == bfd_link_hash_indirect 961 || h->root.type == bfd_link_hash_warning) 962 h = (struct elf_link_hash_entry *) h->root.u.i.link; 963 } 964 965 /* Create got section and local_got_refcounts array if they 966 are needed. */ 967 r_type = elf_s390_tls_transition (info, 968 ELF32_R_TYPE (rel->r_info), 969 h == NULL); 970 switch (r_type) 971 { 972 case R_390_GOT12: 973 case R_390_GOT16: 974 case R_390_GOT20: 975 case R_390_GOT32: 976 case R_390_GOTENT: 977 case R_390_GOTPLT12: 978 case R_390_GOTPLT16: 979 case R_390_GOTPLT20: 980 case R_390_GOTPLT32: 981 case R_390_GOTPLTENT: 982 case R_390_TLS_GD32: 983 case R_390_TLS_GOTIE12: 984 case R_390_TLS_GOTIE20: 985 case R_390_TLS_GOTIE32: 986 case R_390_TLS_IEENT: 987 case R_390_TLS_IE32: 988 case R_390_TLS_LDM32: 989 if (h == NULL 990 && local_got_refcounts == NULL) 991 { 992 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 993 return false; 994 local_got_refcounts = elf_local_got_refcounts (abfd); 995 } 996 /* Fall through. */ 997 case R_390_GOTOFF16: 998 case R_390_GOTOFF32: 999 case R_390_GOTPC: 1000 case R_390_GOTPCDBL: 1001 if (htab->elf.sgot == NULL) 1002 { 1003 if (htab->elf.dynobj == NULL) 1004 htab->elf.dynobj = abfd; 1005 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) 1006 return false; 1007 } 1008 } 1009 1010 if (h != NULL) 1011 { 1012 if (htab->elf.dynobj == NULL) 1013 htab->elf.dynobj = abfd; 1014 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1015 return false; 1016 1017 /* Make sure an IFUNC symbol defined in a non-shared object 1018 always gets a PLT slot. */ 1019 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1020 { 1021 /* The symbol is called by the dynamic loader in order 1022 to resolve the relocation. So it is in fact also 1023 referenced. */ 1024 h->ref_regular = 1; 1025 h->needs_plt = 1; 1026 } 1027 } 1028 switch (r_type) 1029 { 1030 case R_390_GOTPC: 1031 case R_390_GOTPCDBL: 1032 /* These relocs do not need a GOT slot. They just load the 1033 GOT pointer itself or address something else relative to 1034 the GOT. Since the GOT pointer has been set up above we 1035 are done. */ 1036 break; 1037 case R_390_GOTOFF16: 1038 case R_390_GOTOFF32: 1039 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular) 1040 break; 1041 /* Fall through. */ 1042 1043 case R_390_PLT12DBL: 1044 case R_390_PLT16DBL: 1045 case R_390_PLT24DBL: 1046 case R_390_PLT32DBL: 1047 case R_390_PLT32: 1048 case R_390_PLTOFF16: 1049 case R_390_PLTOFF32: 1050 /* This symbol requires a procedure linkage table entry. We 1051 actually build the entry in adjust_dynamic_symbol, 1052 because this might be a case of linking PIC code which is 1053 never referenced by a dynamic object, in which case we 1054 don't need to generate a procedure linkage table entry 1055 after all. */ 1056 1057 /* If this is a local symbol, we resolve it directly without 1058 creating a procedure linkage table entry. */ 1059 if (h != NULL) 1060 { 1061 h->needs_plt = 1; 1062 h->plt.refcount += 1; 1063 } 1064 break; 1065 1066 case R_390_GOTPLT12: 1067 case R_390_GOTPLT16: 1068 case R_390_GOTPLT20: 1069 case R_390_GOTPLT32: 1070 case R_390_GOTPLTENT: 1071 /* This symbol requires either a procedure linkage table entry 1072 or an entry in the local got. We actually build the entry 1073 in adjust_dynamic_symbol because whether this is really a 1074 global reference can change and with it the fact if we have 1075 to create a plt entry or a local got entry. To be able to 1076 make a once global symbol a local one we have to keep track 1077 of the number of gotplt references that exist for this 1078 symbol. */ 1079 if (h != NULL) 1080 { 1081 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1082 h->needs_plt = 1; 1083 h->plt.refcount += 1; 1084 } 1085 else 1086 local_got_refcounts[r_symndx] += 1; 1087 break; 1088 1089 case R_390_TLS_LDM32: 1090 htab->tls_ldm_got.refcount += 1; 1091 break; 1092 1093 case R_390_TLS_IE32: 1094 case R_390_TLS_GOTIE12: 1095 case R_390_TLS_GOTIE20: 1096 case R_390_TLS_GOTIE32: 1097 case R_390_TLS_IEENT: 1098 if (bfd_link_pic (info)) 1099 info->flags |= DF_STATIC_TLS; 1100 /* Fall through. */ 1101 1102 case R_390_GOT12: 1103 case R_390_GOT16: 1104 case R_390_GOT20: 1105 case R_390_GOT32: 1106 case R_390_GOTENT: 1107 case R_390_TLS_GD32: 1108 /* This symbol requires a global offset table entry. */ 1109 switch (r_type) 1110 { 1111 default: 1112 case R_390_GOT12: 1113 case R_390_GOT16: 1114 case R_390_GOT20: 1115 case R_390_GOT32: 1116 case R_390_GOTENT: 1117 tls_type = GOT_NORMAL; 1118 break; 1119 case R_390_TLS_GD32: 1120 tls_type = GOT_TLS_GD; 1121 break; 1122 case R_390_TLS_IE32: 1123 case R_390_TLS_GOTIE32: 1124 tls_type = GOT_TLS_IE; 1125 break; 1126 case R_390_TLS_GOTIE12: 1127 case R_390_TLS_GOTIE20: 1128 case R_390_TLS_IEENT: 1129 tls_type = GOT_TLS_IE_NLT; 1130 break; 1131 } 1132 1133 if (h != NULL) 1134 { 1135 h->got.refcount += 1; 1136 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1137 } 1138 else 1139 { 1140 local_got_refcounts[r_symndx] += 1; 1141 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1142 } 1143 /* If a TLS symbol is accessed using IE at least once, 1144 there is no point to use dynamic model for it. */ 1145 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1146 { 1147 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1148 { 1149 _bfd_error_handler 1150 /* xgettext:c-format */ 1151 (_("%pB: `%s' accessed both as normal and thread local symbol"), 1152 abfd, h->root.root.string); 1153 return false; 1154 } 1155 if (old_tls_type > tls_type) 1156 tls_type = old_tls_type; 1157 } 1158 1159 if (old_tls_type != tls_type) 1160 { 1161 if (h != NULL) 1162 elf_s390_hash_entry (h)->tls_type = tls_type; 1163 else 1164 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1165 } 1166 1167 if (r_type != R_390_TLS_IE32) 1168 break; 1169 /* Fall through. */ 1170 1171 case R_390_TLS_LE32: 1172 /* For static linking and executables this reloc will be 1173 calculated at linktime otherwise a TLS_TPOFF runtime 1174 reloc will be generated. */ 1175 if (r_type == R_390_TLS_LE32 && bfd_link_pie (info)) 1176 break; 1177 1178 if (!bfd_link_pic (info)) 1179 break; 1180 info->flags |= DF_STATIC_TLS; 1181 /* Fall through. */ 1182 1183 case R_390_8: 1184 case R_390_16: 1185 case R_390_32: 1186 case R_390_PC16: 1187 case R_390_PC12DBL: 1188 case R_390_PC16DBL: 1189 case R_390_PC24DBL: 1190 case R_390_PC32DBL: 1191 case R_390_PC32: 1192 if (h != NULL && bfd_link_executable (info)) 1193 { 1194 /* If this reloc is in a read-only section, we might 1195 need a copy reloc. We can't check reliably at this 1196 stage whether the section is read-only, as input 1197 sections have not yet been mapped to output sections. 1198 Tentatively set the flag for now, and correct in 1199 adjust_dynamic_symbol. */ 1200 h->non_got_ref = 1; 1201 1202 if (!bfd_link_pic (info)) 1203 { 1204 /* We may need a .plt entry if the function this reloc 1205 refers to is in a shared lib. */ 1206 h->plt.refcount += 1; 1207 } 1208 } 1209 1210 /* If we are creating a shared library, and this is a reloc 1211 against a global symbol, or a non PC relative reloc 1212 against a local symbol, then we need to copy the reloc 1213 into the shared library. However, if we are linking with 1214 -Bsymbolic, we do not need to copy a reloc against a 1215 global symbol which is defined in an object we are 1216 including in the link (i.e., DEF_REGULAR is set). At 1217 this point we have not seen all the input files, so it is 1218 possible that DEF_REGULAR is not set now but will be set 1219 later (it is never cleared). In case of a weak definition, 1220 DEF_REGULAR may be cleared later by a strong definition in 1221 a shared library. We account for that possibility below by 1222 storing information in the relocs_copied field of the hash 1223 table entry. A similar situation occurs when creating 1224 shared libraries and symbol visibility changes render the 1225 symbol local. 1226 1227 If on the other hand, we are creating an executable, we 1228 may need to keep relocations for symbols satisfied by a 1229 dynamic library if we manage to avoid copy relocs for the 1230 symbol. */ 1231 if ((bfd_link_pic (info) 1232 && (sec->flags & SEC_ALLOC) != 0 1233 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 1234 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL 1235 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL 1236 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL 1237 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL 1238 && ELF32_R_TYPE (rel->r_info) != R_390_PC32) 1239 || (h != NULL 1240 && (! SYMBOLIC_BIND (info, h) 1241 || h->root.type == bfd_link_hash_defweak 1242 || !h->def_regular)))) 1243 || (ELIMINATE_COPY_RELOCS 1244 && !bfd_link_pic (info) 1245 && (sec->flags & SEC_ALLOC) != 0 1246 && h != NULL 1247 && (h->root.type == bfd_link_hash_defweak 1248 || !h->def_regular))) 1249 { 1250 struct elf_dyn_relocs *p; 1251 struct elf_dyn_relocs **head; 1252 1253 /* We must copy these reloc types into the output file. 1254 Create a reloc section in dynobj and make room for 1255 this reloc. */ 1256 if (sreloc == NULL) 1257 { 1258 if (htab->elf.dynobj == NULL) 1259 htab->elf.dynobj = abfd; 1260 1261 sreloc = _bfd_elf_make_dynamic_reloc_section 1262 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ true); 1263 1264 if (sreloc == NULL) 1265 return false; 1266 } 1267 1268 /* If this is a global symbol, we count the number of 1269 relocations we need for this symbol. */ 1270 if (h != NULL) 1271 { 1272 head = &h->dyn_relocs; 1273 } 1274 else 1275 { 1276 /* Track dynamic relocs needed for local syms too. 1277 We really need local syms available to do this 1278 easily. Oh well. */ 1279 asection *s; 1280 void *vpp; 1281 1282 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1283 abfd, r_symndx); 1284 if (isym == NULL) 1285 return false; 1286 1287 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1288 if (s == NULL) 1289 s = sec; 1290 1291 vpp = &elf_section_data (s)->local_dynrel; 1292 head = (struct elf_dyn_relocs **) vpp; 1293 } 1294 1295 p = *head; 1296 if (p == NULL || p->sec != sec) 1297 { 1298 size_t amt = sizeof *p; 1299 1300 p = ((struct elf_dyn_relocs *) 1301 bfd_alloc (htab->elf.dynobj, amt)); 1302 if (p == NULL) 1303 return false; 1304 p->next = *head; 1305 *head = p; 1306 p->sec = sec; 1307 p->count = 0; 1308 p->pc_count = 0; 1309 } 1310 1311 p->count += 1; 1312 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16 1313 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL 1314 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL 1315 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL 1316 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL 1317 || ELF32_R_TYPE (rel->r_info) == R_390_PC32) 1318 p->pc_count += 1; 1319 } 1320 break; 1321 1322 /* This relocation describes the C++ object vtable hierarchy. 1323 Reconstruct it for later use during GC. */ 1324 case R_390_GNU_VTINHERIT: 1325 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1326 return false; 1327 break; 1328 1329 /* This relocation describes which C++ vtable entries are actually 1330 used. Record for later use during GC. */ 1331 case R_390_GNU_VTENTRY: 1332 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1333 return false; 1334 break; 1335 1336 default: 1337 break; 1338 } 1339 } 1340 1341 return true; 1342 } 1343 1344 /* Return the section that should be marked against GC for a given 1345 relocation. */ 1346 1347 static asection * 1348 elf_s390_gc_mark_hook (asection *sec, 1349 struct bfd_link_info *info, 1350 Elf_Internal_Rela *rel, 1351 struct elf_link_hash_entry *h, 1352 Elf_Internal_Sym *sym) 1353 { 1354 if (h != NULL) 1355 switch (ELF32_R_TYPE (rel->r_info)) 1356 { 1357 case R_390_GNU_VTINHERIT: 1358 case R_390_GNU_VTENTRY: 1359 return NULL; 1360 } 1361 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1362 1363 } 1364 1365 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1366 entry but we found we will not create any. Called when we find we will 1367 not have any PLT for this symbol, by for example 1368 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1369 or elf_s390_late_size_sections if no dynamic sections will be 1370 created (we're only linking static objects). */ 1371 1372 static void 1373 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h) 1374 { 1375 if (h->elf.root.type == bfd_link_hash_warning) 1376 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1377 1378 if (h->gotplt_refcount <= 0) 1379 return; 1380 1381 /* We simply add the number of gotplt references to the number 1382 * of got references for this symbol. */ 1383 h->elf.got.refcount += h->gotplt_refcount; 1384 h->gotplt_refcount = -1; 1385 } 1386 1387 /* Adjust a symbol defined by a dynamic object and referenced by a 1388 regular object. The current definition is in some section of the 1389 dynamic object, but we're not including those sections. We have to 1390 change the definition to something the rest of the link can 1391 understand. */ 1392 1393 static bool 1394 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info, 1395 struct elf_link_hash_entry *h) 1396 { 1397 struct elf_s390_link_hash_table *htab; 1398 asection *s, *srel; 1399 1400 /* STT_GNU_IFUNC symbol must go through PLT. */ 1401 if (s390_is_ifunc_symbol_p (h)) 1402 { 1403 /* All local STT_GNU_IFUNC references must be treated as local 1404 calls via local PLT. */ 1405 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h)) 1406 { 1407 bfd_size_type pc_count = 0, count = 0; 1408 struct elf_dyn_relocs **pp; 1409 struct elf_dyn_relocs *p; 1410 1411 for (pp = &h->dyn_relocs; (p = *pp) != NULL; ) 1412 { 1413 pc_count += p->pc_count; 1414 p->count -= p->pc_count; 1415 p->pc_count = 0; 1416 count += p->count; 1417 if (p->count == 0) 1418 *pp = p->next; 1419 else 1420 pp = &p->next; 1421 } 1422 1423 if (pc_count || count) 1424 { 1425 h->needs_plt = 1; 1426 h->non_got_ref = 1; 1427 if (h->plt.refcount <= 0) 1428 h->plt.refcount = 1; 1429 else 1430 h->plt.refcount += 1; 1431 } 1432 } 1433 1434 if (h->plt.refcount <= 0) 1435 { 1436 h->plt.offset = (bfd_vma) -1; 1437 h->needs_plt = 0; 1438 } 1439 return true; 1440 } 1441 1442 /* If this is a function, put it in the procedure linkage table. We 1443 will fill in the contents of the procedure linkage table later 1444 (although we could actually do it here). */ 1445 if (h->type == STT_FUNC 1446 || h->needs_plt) 1447 { 1448 if (h->plt.refcount <= 0 1449 || SYMBOL_CALLS_LOCAL (info, h) 1450 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 1451 { 1452 /* This case can occur if we saw a PLT32 reloc in an input 1453 file, but the symbol was never referred to by a dynamic 1454 object, or if all references were garbage collected. In 1455 such a case, we don't actually need to build a procedure 1456 linkage table, and we can just do a PC32 reloc instead. */ 1457 h->plt.offset = (bfd_vma) -1; 1458 h->needs_plt = 0; 1459 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1460 } 1461 1462 return true; 1463 } 1464 else 1465 /* It's possible that we incorrectly decided a .plt reloc was 1466 needed for an R_390_PC32 reloc to a non-function sym in 1467 check_relocs. We can't decide accurately between function and 1468 non-function syms in check-relocs; Objects loaded later in 1469 the link may change h->type. So fix it now. */ 1470 h->plt.offset = (bfd_vma) -1; 1471 1472 /* If this is a weak symbol, and there is a real definition, the 1473 processor independent code will have arranged for us to see the 1474 real definition first, and we can just use the same value. */ 1475 if (h->is_weakalias) 1476 { 1477 struct elf_link_hash_entry *def = weakdef (h); 1478 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 1479 h->root.u.def.section = def->root.u.def.section; 1480 h->root.u.def.value = def->root.u.def.value; 1481 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1482 h->non_got_ref = def->non_got_ref; 1483 return true; 1484 } 1485 1486 /* This is a reference to a symbol defined by a dynamic object which 1487 is not a function. */ 1488 1489 /* If we are creating a shared library, we must presume that the 1490 only references to the symbol are via the global offset table. 1491 For such cases we need not do anything here; the relocations will 1492 be handled correctly by relocate_section. */ 1493 if (bfd_link_pic (info)) 1494 return true; 1495 1496 /* If there are no references to this symbol that do not use the 1497 GOT, we don't need to generate a copy reloc. */ 1498 if (!h->non_got_ref) 1499 return true; 1500 1501 /* If -z nocopyreloc was given, we won't generate them either. */ 1502 if (info->nocopyreloc) 1503 { 1504 h->non_got_ref = 0; 1505 return true; 1506 } 1507 1508 /* If we don't find any dynamic relocs in read-only sections, then 1509 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1510 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h)) 1511 { 1512 h->non_got_ref = 0; 1513 return true; 1514 } 1515 1516 /* We must allocate the symbol in our .dynbss section, which will 1517 become part of the .bss section of the executable. There will be 1518 an entry for this symbol in the .dynsym section. The dynamic 1519 object will contain position independent code, so all references 1520 from the dynamic object to this symbol will go through the global 1521 offset table. The dynamic linker will use the .dynsym entry to 1522 determine the address it must put in the global offset table, so 1523 both the dynamic object and the regular object will refer to the 1524 same memory location for the variable. */ 1525 1526 htab = elf_s390_hash_table (info); 1527 1528 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1529 copy the initial value out of the dynamic object and into the 1530 runtime process image. */ 1531 if ((h->root.u.def.section->flags & SEC_READONLY) != 0) 1532 { 1533 s = htab->elf.sdynrelro; 1534 srel = htab->elf.sreldynrelro; 1535 } 1536 else 1537 { 1538 s = htab->elf.sdynbss; 1539 srel = htab->elf.srelbss; 1540 } 1541 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1542 { 1543 srel->size += sizeof (Elf32_External_Rela); 1544 h->needs_copy = 1; 1545 } 1546 1547 return _bfd_elf_adjust_dynamic_copy (info, h, s); 1548 } 1549 1550 /* Allocate space in .plt, .got and associated reloc sections for 1551 dynamic relocs. */ 1552 1553 static bool 1554 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1555 { 1556 struct bfd_link_info *info; 1557 struct elf_s390_link_hash_table *htab; 1558 struct elf_dyn_relocs *p; 1559 1560 if (h->root.type == bfd_link_hash_indirect) 1561 return true; 1562 1563 info = (struct bfd_link_info *) inf; 1564 htab = elf_s390_hash_table (info); 1565 1566 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 1567 here if it is defined and referenced in a non-shared object. */ 1568 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1569 return s390_elf_allocate_ifunc_dyn_relocs (info, h); 1570 else if (htab->elf.dynamic_sections_created 1571 && h->plt.refcount > 0) 1572 { 1573 /* Make sure this symbol is output as a dynamic symbol. 1574 Undefined weak syms won't yet be marked as dynamic. */ 1575 if (h->dynindx == -1 1576 && !h->forced_local) 1577 { 1578 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1579 return false; 1580 } 1581 1582 if (bfd_link_pic (info) 1583 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1584 { 1585 asection *s = htab->elf.splt; 1586 1587 /* If this is the first .plt entry, make room for the special 1588 first entry. */ 1589 if (s->size == 0) 1590 s->size += PLT_FIRST_ENTRY_SIZE; 1591 1592 h->plt.offset = s->size; 1593 1594 /* If this symbol is not defined in a regular file, and we are 1595 not generating a shared library, then set the symbol to this 1596 location in the .plt. This is required to make function 1597 pointers compare as equal between the normal executable and 1598 the shared library. */ 1599 if (! bfd_link_pic (info) 1600 && !h->def_regular) 1601 { 1602 h->root.u.def.section = s; 1603 h->root.u.def.value = h->plt.offset; 1604 } 1605 1606 /* Make room for this entry. */ 1607 s->size += PLT_ENTRY_SIZE; 1608 1609 /* We also need to make an entry in the .got.plt section, which 1610 will be placed in the .got section by the linker script. */ 1611 htab->elf.sgotplt->size += GOT_ENTRY_SIZE; 1612 1613 /* We also need to make an entry in the .rela.plt section. */ 1614 htab->elf.srelplt->size += sizeof (Elf32_External_Rela); 1615 } 1616 else 1617 { 1618 h->plt.offset = (bfd_vma) -1; 1619 h->needs_plt = 0; 1620 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1621 } 1622 } 1623 else 1624 { 1625 h->plt.offset = (bfd_vma) -1; 1626 h->needs_plt = 0; 1627 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1628 } 1629 1630 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to 1631 the binary, we can optimize a bit. IE32 and GOTIE32 get converted 1632 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT 1633 we can save the dynamic TLS relocation. */ 1634 if (h->got.refcount > 0 1635 && !bfd_link_pic (info) 1636 && h->dynindx == -1 1637 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1638 { 1639 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1640 /* For the GOTIE access without a literal pool entry the offset has 1641 to be stored somewhere. The immediate value in the instruction 1642 is not bit enough so the value is stored in the got. */ 1643 { 1644 h->got.offset = htab->elf.sgot->size; 1645 htab->elf.sgot->size += GOT_ENTRY_SIZE; 1646 } 1647 else 1648 h->got.offset = (bfd_vma) -1; 1649 } 1650 else if (h->got.refcount > 0) 1651 { 1652 asection *s; 1653 bool dyn; 1654 int tls_type = elf_s390_hash_entry(h)->tls_type; 1655 1656 /* Make sure this symbol is output as a dynamic symbol. 1657 Undefined weak syms won't yet be marked as dynamic. */ 1658 if (h->dynindx == -1 1659 && !h->forced_local) 1660 { 1661 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1662 return false; 1663 } 1664 1665 s = htab->elf.sgot; 1666 h->got.offset = s->size; 1667 s->size += GOT_ENTRY_SIZE; 1668 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */ 1669 if (tls_type == GOT_TLS_GD) 1670 s->size += GOT_ENTRY_SIZE; 1671 dyn = htab->elf.dynamic_sections_created; 1672 /* R_390_TLS_IE32 needs one dynamic relocation, 1673 R_390_TLS_GD32 needs one if local symbol and two if global. */ 1674 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1675 || tls_type >= GOT_TLS_IE) 1676 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1677 else if (tls_type == GOT_TLS_GD) 1678 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela); 1679 else if (!UNDEFWEAK_NO_DYNAMIC_RELOC (info, h) 1680 && (bfd_link_pic (info) 1681 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1682 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1683 } 1684 else 1685 h->got.offset = (bfd_vma) -1; 1686 1687 if (h->dyn_relocs == NULL) 1688 return true; 1689 1690 /* In the shared -Bsymbolic case, discard space allocated for 1691 dynamic pc-relative relocs against symbols which turn out to be 1692 defined in regular objects. For the normal shared case, discard 1693 space for pc-relative relocs that have become local due to symbol 1694 visibility changes. */ 1695 1696 if (bfd_link_pic (info)) 1697 { 1698 if (SYMBOL_CALLS_LOCAL (info, h)) 1699 { 1700 struct elf_dyn_relocs **pp; 1701 1702 for (pp = &h->dyn_relocs; (p = *pp) != NULL; ) 1703 { 1704 p->count -= p->pc_count; 1705 p->pc_count = 0; 1706 if (p->count == 0) 1707 *pp = p->next; 1708 else 1709 pp = &p->next; 1710 } 1711 } 1712 1713 /* Also discard relocs on undefined weak syms with non-default 1714 visibility. */ 1715 if (h->dyn_relocs != NULL 1716 && h->root.type == bfd_link_hash_undefweak) 1717 { 1718 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1719 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 1720 h->dyn_relocs = NULL; 1721 1722 /* Make sure undefined weak symbols are output as a dynamic 1723 symbol in PIEs. */ 1724 else if (h->dynindx == -1 1725 && !h->forced_local) 1726 { 1727 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1728 return false; 1729 } 1730 } 1731 } 1732 else if (ELIMINATE_COPY_RELOCS) 1733 { 1734 /* For the non-shared case, discard space for relocs against 1735 symbols which turn out to need copy relocs or are not 1736 dynamic. */ 1737 1738 if (!h->non_got_ref 1739 && ((h->def_dynamic 1740 && !h->def_regular) 1741 || (htab->elf.dynamic_sections_created 1742 && (h->root.type == bfd_link_hash_undefweak 1743 || h->root.type == bfd_link_hash_undefined)))) 1744 { 1745 /* Make sure this symbol is output as a dynamic symbol. 1746 Undefined weak syms won't yet be marked as dynamic. */ 1747 if (h->dynindx == -1 1748 && !h->forced_local) 1749 { 1750 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1751 return false; 1752 } 1753 1754 /* If that succeeded, we know we'll be keeping all the 1755 relocs. */ 1756 if (h->dynindx != -1) 1757 goto keep; 1758 } 1759 1760 h->dyn_relocs = NULL; 1761 1762 keep: ; 1763 } 1764 1765 /* Finally, allocate space. */ 1766 for (p = h->dyn_relocs; p != NULL; p = p->next) 1767 { 1768 asection *sreloc = elf_section_data (p->sec)->sreloc; 1769 1770 sreloc->size += p->count * sizeof (Elf32_External_Rela); 1771 } 1772 1773 return true; 1774 } 1775 1776 /* Set the sizes of the dynamic sections. */ 1777 1778 static bool 1779 elf_s390_late_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1780 struct bfd_link_info *info) 1781 { 1782 struct elf_s390_link_hash_table *htab; 1783 bfd *dynobj; 1784 asection *s; 1785 bool relocs; 1786 bfd *ibfd; 1787 1788 htab = elf_s390_hash_table (info); 1789 dynobj = htab->elf.dynobj; 1790 if (dynobj == NULL) 1791 return true; 1792 1793 if (htab->elf.dynamic_sections_created) 1794 { 1795 /* Set the contents of the .interp section to the interpreter. */ 1796 if (bfd_link_executable (info) && !info->nointerp) 1797 { 1798 s = bfd_get_linker_section (dynobj, ".interp"); 1799 if (s == NULL) 1800 abort (); 1801 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1802 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1803 } 1804 } 1805 1806 /* Set up .got offsets for local syms, and space for local dynamic 1807 relocs. */ 1808 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 1809 { 1810 bfd_signed_vma *local_got; 1811 bfd_signed_vma *end_local_got; 1812 char *local_tls_type; 1813 bfd_size_type locsymcount; 1814 Elf_Internal_Shdr *symtab_hdr; 1815 asection *srela; 1816 struct plt_entry *local_plt; 1817 unsigned int i; 1818 1819 if (! is_s390_elf (ibfd)) 1820 continue; 1821 1822 for (s = ibfd->sections; s != NULL; s = s->next) 1823 { 1824 struct elf_dyn_relocs *p; 1825 1826 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 1827 { 1828 if (!bfd_is_abs_section (p->sec) 1829 && bfd_is_abs_section (p->sec->output_section)) 1830 { 1831 /* Input section has been discarded, either because 1832 it is a copy of a linkonce section or due to 1833 linker script /DISCARD/, so we'll be discarding 1834 the relocs too. */ 1835 } 1836 else if (p->count != 0) 1837 { 1838 srela = elf_section_data (p->sec)->sreloc; 1839 srela->size += p->count * sizeof (Elf32_External_Rela); 1840 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1841 info->flags |= DF_TEXTREL; 1842 } 1843 } 1844 } 1845 1846 local_got = elf_local_got_refcounts (ibfd); 1847 if (!local_got) 1848 continue; 1849 1850 symtab_hdr = &elf_symtab_hdr (ibfd); 1851 locsymcount = symtab_hdr->sh_info; 1852 end_local_got = local_got + locsymcount; 1853 local_tls_type = elf_s390_local_got_tls_type (ibfd); 1854 s = htab->elf.sgot; 1855 srela = htab->elf.srelgot; 1856 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 1857 { 1858 if (*local_got > 0) 1859 { 1860 *local_got = s->size; 1861 s->size += GOT_ENTRY_SIZE; 1862 if (*local_tls_type == GOT_TLS_GD) 1863 s->size += GOT_ENTRY_SIZE; 1864 if (bfd_link_pic (info)) 1865 srela->size += sizeof (Elf32_External_Rela); 1866 } 1867 else 1868 *local_got = (bfd_vma) -1; 1869 } 1870 local_plt = elf_s390_local_plt (ibfd); 1871 for (i = 0; i < symtab_hdr->sh_info; i++) 1872 { 1873 if (local_plt[i].plt.refcount > 0) 1874 { 1875 local_plt[i].plt.offset = htab->elf.iplt->size; 1876 htab->elf.iplt->size += PLT_ENTRY_SIZE; 1877 htab->elf.igotplt->size += GOT_ENTRY_SIZE; 1878 htab->elf.irelplt->size += RELA_ENTRY_SIZE; 1879 } 1880 else 1881 local_plt[i].plt.offset = (bfd_vma) -1; 1882 } 1883 } 1884 1885 if (htab->tls_ldm_got.refcount > 0) 1886 { 1887 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32 1888 relocs. */ 1889 htab->tls_ldm_got.offset = htab->elf.sgot->size; 1890 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; 1891 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1892 } 1893 else 1894 htab->tls_ldm_got.offset = -1; 1895 1896 /* Allocate global sym .plt and .got entries, and space for global 1897 sym dynamic relocs. */ 1898 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 1899 1900 /* We now have determined the sizes of the various dynamic sections. 1901 Allocate memory for them. */ 1902 relocs = false; 1903 for (s = dynobj->sections; s != NULL; s = s->next) 1904 { 1905 if ((s->flags & SEC_LINKER_CREATED) == 0) 1906 continue; 1907 1908 if (s == htab->elf.splt 1909 || s == htab->elf.sgot 1910 || s == htab->elf.sgotplt 1911 || s == htab->elf.sdynbss 1912 || s == htab->elf.sdynrelro 1913 || s == htab->elf.iplt 1914 || s == htab->elf.igotplt 1915 || s == htab->irelifunc) 1916 { 1917 /* Strip this section if we don't need it; see the 1918 comment below. */ 1919 } 1920 else if (startswith (bfd_section_name (s), ".rela")) 1921 { 1922 if (s->size != 0) 1923 relocs = true; 1924 1925 /* We use the reloc_count field as a counter if we need 1926 to copy relocs into the output file. */ 1927 s->reloc_count = 0; 1928 } 1929 else 1930 { 1931 /* It's not one of our sections, so don't allocate space. */ 1932 continue; 1933 } 1934 1935 if (s->size == 0) 1936 { 1937 /* If we don't need this section, strip it from the 1938 output file. This is to handle .rela.bss and 1939 .rela.plt. We must create it in 1940 create_dynamic_sections, because it must be created 1941 before the linker maps input sections to output 1942 sections. The linker does that before 1943 adjust_dynamic_symbol is called, and it is that 1944 function which decides whether anything needs to go 1945 into these sections. */ 1946 1947 s->flags |= SEC_EXCLUDE; 1948 continue; 1949 } 1950 1951 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1952 continue; 1953 1954 /* Allocate memory for the section contents. We use bfd_zalloc 1955 here in case unused entries are not reclaimed before the 1956 section's contents are written out. This should not happen, 1957 but this way if it does, we get a R_390_NONE reloc instead 1958 of garbage. */ 1959 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1960 if (s->contents == NULL) 1961 return false; 1962 } 1963 1964 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 1965 } 1966 1967 /* Return the base VMA address which should be subtracted from real addresses 1968 when resolving @dtpoff relocation. 1969 This is PT_TLS segment p_vaddr. */ 1970 1971 static bfd_vma 1972 dtpoff_base (struct bfd_link_info *info) 1973 { 1974 /* If tls_sec is NULL, we should have signalled an error already. */ 1975 if (elf_hash_table (info)->tls_sec == NULL) 1976 return 0; 1977 return elf_hash_table (info)->tls_sec->vma; 1978 } 1979 1980 /* Return the relocation value for @tpoff relocation 1981 if STT_TLS virtual address is ADDRESS. */ 1982 1983 static bfd_vma 1984 tpoff (struct bfd_link_info *info, bfd_vma address) 1985 { 1986 struct elf_link_hash_table *htab = elf_hash_table (info); 1987 1988 /* If tls_sec is NULL, we should have signalled an error already. */ 1989 if (htab->tls_sec == NULL) 1990 return 0; 1991 return htab->tls_size + htab->tls_sec->vma - address; 1992 } 1993 1994 /* Complain if TLS instruction relocation is against an invalid 1995 instruction. */ 1996 1997 static void 1998 invalid_tls_insn (bfd *input_bfd, 1999 asection *input_section, 2000 Elf_Internal_Rela *rel) 2001 { 2002 reloc_howto_type *howto; 2003 2004 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info); 2005 _bfd_error_handler 2006 /* xgettext:c-format */ 2007 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"), 2008 input_bfd, 2009 input_section, 2010 (uint64_t) rel->r_offset, 2011 howto->name); 2012 bfd_set_error (bfd_error_bad_value); 2013 } 2014 2015 /* Relocate a 390 ELF section. */ 2016 2017 static int 2018 elf_s390_relocate_section (bfd *output_bfd, 2019 struct bfd_link_info *info, 2020 bfd *input_bfd, 2021 asection *input_section, 2022 bfd_byte *contents, 2023 Elf_Internal_Rela *relocs, 2024 Elf_Internal_Sym *local_syms, 2025 asection **local_sections) 2026 { 2027 struct elf_s390_link_hash_table *htab; 2028 Elf_Internal_Shdr *symtab_hdr; 2029 struct elf_link_hash_entry **sym_hashes; 2030 bfd_vma *local_got_offsets; 2031 Elf_Internal_Rela *rel; 2032 Elf_Internal_Rela *relend; 2033 2034 if (!is_s390_elf (input_bfd)) 2035 { 2036 bfd_set_error (bfd_error_wrong_format); 2037 return false; 2038 } 2039 2040 htab = elf_s390_hash_table (info); 2041 symtab_hdr = &elf_symtab_hdr (input_bfd); 2042 sym_hashes = elf_sym_hashes (input_bfd); 2043 local_got_offsets = elf_local_got_offsets (input_bfd); 2044 2045 rel = relocs; 2046 relend = relocs + input_section->reloc_count; 2047 for (; rel < relend; rel++) 2048 { 2049 unsigned int r_type; 2050 reloc_howto_type *howto; 2051 unsigned long r_symndx; 2052 struct elf_link_hash_entry *h; 2053 Elf_Internal_Sym *sym; 2054 asection *sec; 2055 bfd_vma off; 2056 bfd_vma relocation; 2057 bool unresolved_reloc; 2058 bfd_reloc_status_type r; 2059 int tls_type; 2060 asection *base_got = htab->elf.sgot; 2061 bool resolved_to_zero; 2062 2063 r_type = ELF32_R_TYPE (rel->r_info); 2064 if (r_type == (int) R_390_GNU_VTINHERIT 2065 || r_type == (int) R_390_GNU_VTENTRY) 2066 continue; 2067 if (r_type >= (int) R_390_max) 2068 { 2069 bfd_set_error (bfd_error_bad_value); 2070 return false; 2071 } 2072 2073 howto = elf_howto_table + r_type; 2074 r_symndx = ELF32_R_SYM (rel->r_info); 2075 2076 h = NULL; 2077 sym = NULL; 2078 sec = NULL; 2079 unresolved_reloc = false; 2080 if (r_symndx < symtab_hdr->sh_info) 2081 { 2082 sym = local_syms + r_symndx; 2083 sec = local_sections[r_symndx]; 2084 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2085 { 2086 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd); 2087 if (local_plt == NULL) 2088 return false; 2089 2090 /* Address of the PLT slot. */ 2091 relocation = (htab->elf.iplt->output_section->vma 2092 + htab->elf.iplt->output_offset 2093 + local_plt[r_symndx].plt.offset); 2094 2095 switch (r_type) 2096 { 2097 case R_390_PLTOFF16: 2098 case R_390_PLTOFF32: 2099 relocation -= htab->elf.sgot->output_section->vma; 2100 break; 2101 case R_390_GOTPLT12: 2102 case R_390_GOTPLT16: 2103 case R_390_GOTPLT20: 2104 case R_390_GOTPLT32: 2105 case R_390_GOTPLTENT: 2106 case R_390_GOT12: 2107 case R_390_GOT16: 2108 case R_390_GOT20: 2109 case R_390_GOT32: 2110 case R_390_GOTENT: 2111 { 2112 /* Write the PLT slot address into the GOT slot. */ 2113 bfd_put_32 (output_bfd, relocation, 2114 htab->elf.sgot->contents + 2115 local_got_offsets[r_symndx]); 2116 relocation = (local_got_offsets[r_symndx] + 2117 htab->elf.sgot->output_offset); 2118 2119 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2120 relocation += htab->elf.sgot->output_section->vma; 2121 break; 2122 } 2123 default: 2124 break; 2125 } 2126 /* The output section is needed later in 2127 finish_dynamic_section when creating the dynamic 2128 relocation. */ 2129 local_plt[r_symndx].sec = sec; 2130 goto do_relocation; 2131 } 2132 else 2133 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2134 } 2135 else 2136 { 2137 bool warned ATTRIBUTE_UNUSED; 2138 bool ignored ATTRIBUTE_UNUSED; 2139 2140 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2141 r_symndx, symtab_hdr, sym_hashes, 2142 h, sec, relocation, 2143 unresolved_reloc, warned, ignored); 2144 } 2145 2146 if (sec != NULL && discarded_section (sec)) 2147 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2148 rel, 1, relend, howto, 0, contents); 2149 2150 if (bfd_link_relocatable (info)) 2151 continue; 2152 2153 resolved_to_zero = (h != NULL 2154 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); 2155 2156 switch (r_type) 2157 { 2158 case R_390_GOTPLT12: 2159 case R_390_GOTPLT16: 2160 case R_390_GOTPLT20: 2161 case R_390_GOTPLT32: 2162 case R_390_GOTPLTENT: 2163 /* There are three cases for a GOTPLT relocation. 1) The 2164 relocation is against the jump slot entry of a plt that 2165 will get emitted to the output file. 2) The relocation 2166 is against the jump slot of a plt entry that has been 2167 removed. elf_s390_adjust_gotplt has created a GOT entry 2168 as replacement. 3) The relocation is against a local symbol. 2169 Cases 2) and 3) are the same as the GOT relocation code 2170 so we just have to test for case 1 and fall through for 2171 the other two. */ 2172 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2173 { 2174 bfd_vma plt_index; 2175 2176 if (s390_is_ifunc_symbol_p (h)) 2177 { 2178 plt_index = h->plt.offset / PLT_ENTRY_SIZE; 2179 relocation = (plt_index * GOT_ENTRY_SIZE + 2180 htab->elf.igotplt->output_offset); 2181 if (r_type == R_390_GOTPLTENT) 2182 relocation += htab->elf.igotplt->output_section->vma; 2183 } 2184 else 2185 { 2186 /* Calc. index no. 2187 Current offset - size first entry / entry size. */ 2188 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2189 PLT_ENTRY_SIZE; 2190 2191 /* Offset in GOT is PLT index plus GOT headers(3) 2192 times 4, addr & GOT addr. */ 2193 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2194 if (r_type == R_390_GOTPLTENT) 2195 relocation += htab->elf.sgot->output_section->vma; 2196 } 2197 unresolved_reloc = false; 2198 2199 } 2200 /* Fall through. */ 2201 2202 case R_390_GOT12: 2203 case R_390_GOT16: 2204 case R_390_GOT20: 2205 case R_390_GOT32: 2206 case R_390_GOTENT: 2207 /* Relocation is to the entry for this symbol in the global 2208 offset table. */ 2209 if (base_got == NULL) 2210 abort (); 2211 2212 if (h != NULL) 2213 { 2214 bool dyn; 2215 2216 off = h->got.offset; 2217 dyn = htab->elf.dynamic_sections_created; 2218 2219 if (s390_is_ifunc_symbol_p (h)) 2220 { 2221 BFD_ASSERT (h->plt.offset != (bfd_vma) -1); 2222 if (off == (bfd_vma)-1) 2223 { 2224 /* No explicit GOT usage so redirect to the 2225 got.iplt slot. */ 2226 base_got = htab->elf.igotplt; 2227 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE; 2228 } 2229 else 2230 { 2231 /* Explicit GOT slots must contain the address 2232 of the PLT slot. This will be handled in 2233 finish_dynamic_symbol. */ 2234 } 2235 } 2236 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 2237 bfd_link_pic (info), 2238 h) 2239 || (bfd_link_pic (info) 2240 && SYMBOL_REFERENCES_LOCAL (info, h)) 2241 || resolved_to_zero) 2242 { 2243 /* This is actually a static link, or it is a 2244 -Bsymbolic link and the symbol is defined 2245 locally, or the symbol was forced to be local 2246 because of a version file. We must initialize 2247 this entry in the global offset table. Since the 2248 offset must always be a multiple of 2, we use the 2249 least significant bit to record whether we have 2250 initialized it already. 2251 2252 When doing a dynamic link, we create a .rel.got 2253 relocation entry to initialize the value. This 2254 is done in the finish_dynamic_symbol routine. */ 2255 if ((off & 1) != 0) 2256 off &= ~1; 2257 else 2258 { 2259 bfd_put_32 (output_bfd, relocation, 2260 base_got->contents + off); 2261 h->got.offset |= 1; 2262 } 2263 2264 if ((h->def_regular 2265 && bfd_link_pic (info) 2266 && SYMBOL_REFERENCES_LOCAL (info, h)) 2267 /* lrl rx,sym@GOTENT -> larl rx, sym */ 2268 && ((r_type == R_390_GOTENT 2269 && (bfd_get_16 (input_bfd, 2270 contents + rel->r_offset - 2) 2271 & 0xff0f) == 0xc40d) 2272 /* ly rx, sym@GOT(r12) -> larl rx, sym */ 2273 || (r_type == R_390_GOT20 2274 && (bfd_get_32 (input_bfd, 2275 contents + rel->r_offset - 2) 2276 & 0xff00f000) == 0xe300c000 2277 && bfd_get_8 (input_bfd, 2278 contents + rel->r_offset + 3) == 0x58))) 2279 { 2280 unsigned short new_insn = 2281 (0xc000 | (bfd_get_8 (input_bfd, 2282 contents + rel->r_offset - 1) & 0xf0)); 2283 bfd_put_16 (output_bfd, new_insn, 2284 contents + rel->r_offset - 2); 2285 r_type = R_390_PC32DBL; 2286 rel->r_addend = 2; 2287 howto = elf_howto_table + r_type; 2288 relocation = h->root.u.def.value 2289 + h->root.u.def.section->output_section->vma 2290 + h->root.u.def.section->output_offset; 2291 goto do_relocation; 2292 } 2293 } 2294 else 2295 unresolved_reloc = false; 2296 } 2297 else 2298 { 2299 if (local_got_offsets == NULL) 2300 abort (); 2301 2302 off = local_got_offsets[r_symndx]; 2303 2304 /* The offset must always be a multiple of 4. We use 2305 the least significant bit to record whether we have 2306 already generated the necessary reloc. */ 2307 if ((off & 1) != 0) 2308 off &= ~1; 2309 else 2310 { 2311 bfd_put_32 (output_bfd, relocation, 2312 htab->elf.sgot->contents + off); 2313 2314 if (bfd_link_pic (info)) 2315 { 2316 asection *srelgot; 2317 Elf_Internal_Rela outrel; 2318 bfd_byte *loc; 2319 2320 srelgot = htab->elf.srelgot; 2321 if (srelgot == NULL) 2322 abort (); 2323 2324 outrel.r_offset = (htab->elf.sgot->output_section->vma 2325 + htab->elf.sgot->output_offset 2326 + off); 2327 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2328 outrel.r_addend = relocation; 2329 loc = srelgot->contents; 2330 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 2331 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2332 } 2333 2334 local_got_offsets[r_symndx] |= 1; 2335 } 2336 } 2337 2338 if (off >= (bfd_vma) -2) 2339 abort (); 2340 2341 relocation = base_got->output_offset + off; 2342 2343 /* For @GOTENT the relocation is against the offset between 2344 the instruction and the symbols entry in the GOT and not 2345 between the start of the GOT and the symbols entry. We 2346 add the vma of the GOT to get the correct value. */ 2347 if ( r_type == R_390_GOTENT 2348 || r_type == R_390_GOTPLTENT) 2349 relocation += base_got->output_section->vma; 2350 2351 break; 2352 2353 case R_390_GOTOFF16: 2354 case R_390_GOTOFF32: 2355 /* Relocation is relative to the start of the global offset 2356 table. */ 2357 2358 if (h != NULL 2359 && s390_is_ifunc_symbol_p (h) 2360 && h->def_regular 2361 && !bfd_link_executable (info)) 2362 { 2363 relocation = (htab->elf.iplt->output_section->vma 2364 + htab->elf.iplt->output_offset 2365 + h->plt.offset 2366 - htab->elf.sgot->output_section->vma); 2367 goto do_relocation; 2368 } 2369 2370 /* Note that sgot->output_offset is not involved in this 2371 calculation. We always want the start of .got. If we 2372 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2373 permitted by the ABI, we might have to change this 2374 calculation. */ 2375 relocation -= htab->elf.sgot->output_section->vma; 2376 break; 2377 2378 case R_390_GOTPC: 2379 case R_390_GOTPCDBL: 2380 /* Use global offset table as symbol value. */ 2381 relocation = htab->elf.sgot->output_section->vma; 2382 unresolved_reloc = false; 2383 break; 2384 2385 case R_390_PLT12DBL: 2386 case R_390_PLT16DBL: 2387 case R_390_PLT24DBL: 2388 case R_390_PLT32DBL: 2389 case R_390_PLT32: 2390 /* Relocation is to the entry for this symbol in the 2391 procedure linkage table. */ 2392 2393 /* Resolve a PLT32 reloc against a local symbol directly, 2394 without using the procedure linkage table. */ 2395 if (h == NULL) 2396 break; 2397 2398 if (h->plt.offset == (bfd_vma) -1 2399 || (htab->elf.splt == NULL && htab->elf.iplt == NULL)) 2400 { 2401 /* We didn't make a PLT entry for this symbol. This 2402 happens when statically linking PIC code, or when 2403 using -Bsymbolic. */ 2404 break; 2405 } 2406 2407 if (s390_is_ifunc_symbol_p (h)) 2408 relocation = (htab->elf.iplt->output_section->vma 2409 + htab->elf.iplt->output_offset 2410 + h->plt.offset); 2411 else 2412 relocation = (htab->elf.splt->output_section->vma 2413 + htab->elf.splt->output_offset 2414 + h->plt.offset); 2415 unresolved_reloc = false; 2416 break; 2417 2418 case R_390_PLTOFF16: 2419 case R_390_PLTOFF32: 2420 /* Relocation is to the entry for this symbol in the 2421 procedure linkage table relative to the start of the GOT. */ 2422 2423 /* For local symbols or if we didn't make a PLT entry for 2424 this symbol resolve the symbol directly. */ 2425 if (h == NULL 2426 || h->plt.offset == (bfd_vma) -1 2427 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h))) 2428 { 2429 relocation -= htab->elf.sgot->output_section->vma; 2430 break; 2431 } 2432 2433 if (s390_is_ifunc_symbol_p (h)) 2434 relocation = (htab->elf.iplt->output_section->vma 2435 + htab->elf.iplt->output_offset 2436 + h->plt.offset 2437 - htab->elf.sgot->output_section->vma); 2438 else 2439 relocation = (htab->elf.splt->output_section->vma 2440 + htab->elf.splt->output_offset 2441 + h->plt.offset 2442 - htab->elf.sgot->output_section->vma); 2443 unresolved_reloc = false; 2444 break; 2445 2446 case R_390_PC16: 2447 case R_390_PC12DBL: 2448 case R_390_PC16DBL: 2449 case R_390_PC24DBL: 2450 case R_390_PC32DBL: 2451 case R_390_PC32: 2452 if (h != NULL 2453 && s390_is_ifunc_symbol_p (h) 2454 && h->def_regular 2455 && !bfd_link_executable (info)) 2456 { 2457 /* This will not work our if the function does not 2458 happen to set up the GOT pointer for some other 2459 reason. 31 bit PLT entries require r12 to hold the 2460 GOT pointer. 2461 FIXME: Implement an errorcheck. 2462 NOTE: It will work when brasl is not available 2463 (e.g. with -m31 -march=g5) since a local function 2464 call then does use GOTOFF which implies r12 being set 2465 up. */ 2466 relocation = (htab->elf.iplt->output_section->vma 2467 + htab->elf.iplt->output_offset 2468 + h ->plt.offset); 2469 goto do_relocation; 2470 } 2471 /* Fall through. */ 2472 2473 case R_390_8: 2474 case R_390_16: 2475 case R_390_32: 2476 if ((input_section->flags & SEC_ALLOC) == 0) 2477 break; 2478 2479 if (h != NULL 2480 && s390_is_ifunc_symbol_p (h) 2481 && h->def_regular) 2482 { 2483 if (!bfd_link_pic (info)) 2484 { 2485 /* For a non-shared object STT_GNU_IFUNC symbol must 2486 go through PLT. */ 2487 relocation = (htab->elf.iplt->output_section->vma 2488 + htab->elf.iplt->output_offset 2489 + h ->plt.offset); 2490 goto do_relocation; 2491 } 2492 else 2493 { 2494 /* For shared objects a runtime relocation is needed. */ 2495 2496 Elf_Internal_Rela outrel; 2497 asection *sreloc; 2498 2499 /* Need a dynamic relocation to get the real function 2500 address. */ 2501 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2502 info, 2503 input_section, 2504 rel->r_offset); 2505 if (outrel.r_offset == (bfd_vma) -1 2506 || outrel.r_offset == (bfd_vma) -2) 2507 abort (); 2508 2509 outrel.r_offset += (input_section->output_section->vma 2510 + input_section->output_offset); 2511 2512 if (h->dynindx == -1 2513 || h->forced_local 2514 || bfd_link_executable (info)) 2515 { 2516 /* This symbol is resolved locally. */ 2517 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 2518 outrel.r_addend = (h->root.u.def.value 2519 + h->root.u.def.section->output_section->vma 2520 + h->root.u.def.section->output_offset); 2521 } 2522 else 2523 { 2524 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2525 outrel.r_addend = 0; 2526 } 2527 2528 sreloc = htab->elf.irelifunc; 2529 elf_append_rela (output_bfd, sreloc, &outrel); 2530 2531 /* If this reloc is against an external symbol, we 2532 do not want to fiddle with the addend. Otherwise, 2533 we need to include the symbol value so that it 2534 becomes an addend for the dynamic reloc. For an 2535 internal symbol, we have updated addend. */ 2536 continue; 2537 } 2538 } 2539 2540 if ((bfd_link_pic (info) 2541 && (h == NULL 2542 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2543 && !resolved_to_zero) 2544 || h->root.type != bfd_link_hash_undefweak) 2545 && ((r_type != R_390_PC16 2546 && r_type != R_390_PC12DBL 2547 && r_type != R_390_PC16DBL 2548 && r_type != R_390_PC24DBL 2549 && r_type != R_390_PC32DBL 2550 && r_type != R_390_PC32) 2551 || !SYMBOL_CALLS_LOCAL (info, h))) 2552 || (ELIMINATE_COPY_RELOCS 2553 && !bfd_link_pic (info) 2554 && h != NULL 2555 && h->dynindx != -1 2556 && !h->non_got_ref 2557 && ((h->def_dynamic 2558 && !h->def_regular) 2559 || h->root.type == bfd_link_hash_undefweak 2560 || h->root.type == bfd_link_hash_undefined))) 2561 { 2562 Elf_Internal_Rela outrel; 2563 bool skip, relocate; 2564 asection *sreloc; 2565 bfd_byte *loc; 2566 2567 /* When generating a shared object, these relocations 2568 are copied into the output file to be resolved at run 2569 time. */ 2570 2571 skip = false; 2572 relocate = false; 2573 2574 outrel.r_offset = 2575 _bfd_elf_section_offset (output_bfd, info, input_section, 2576 rel->r_offset); 2577 if (outrel.r_offset == (bfd_vma) -1) 2578 skip = true; 2579 else if (outrel.r_offset == (bfd_vma) -2) 2580 skip = true, relocate = true; 2581 outrel.r_offset += (input_section->output_section->vma 2582 + input_section->output_offset); 2583 2584 if (skip) 2585 memset (&outrel, 0, sizeof outrel); 2586 else if (h != NULL 2587 && h->dynindx != -1 2588 && (r_type == R_390_PC16 2589 || r_type == R_390_PC12DBL 2590 || r_type == R_390_PC16DBL 2591 || r_type == R_390_PC24DBL 2592 || r_type == R_390_PC32DBL 2593 || r_type == R_390_PC32 2594 || !bfd_link_pic (info) 2595 || !SYMBOLIC_BIND (info, h) 2596 || !h->def_regular)) 2597 { 2598 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2599 outrel.r_addend = rel->r_addend; 2600 } 2601 else 2602 { 2603 /* This symbol is local, or marked to become local. */ 2604 outrel.r_addend = relocation + rel->r_addend; 2605 if (r_type == R_390_32) 2606 { 2607 relocate = true; 2608 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2609 } 2610 else 2611 { 2612 long sindx; 2613 2614 if (bfd_is_abs_section (sec)) 2615 sindx = 0; 2616 else if (sec == NULL || sec->owner == NULL) 2617 { 2618 bfd_set_error(bfd_error_bad_value); 2619 return false; 2620 } 2621 else 2622 { 2623 asection *osec; 2624 2625 osec = sec->output_section; 2626 sindx = elf_section_data (osec)->dynindx; 2627 if (sindx == 0) 2628 { 2629 osec = htab->elf.text_index_section; 2630 sindx = elf_section_data (osec)->dynindx; 2631 } 2632 BFD_ASSERT (sindx != 0); 2633 2634 /* We are turning this relocation into one 2635 against a section symbol, so subtract out 2636 the output section's address but not the 2637 offset of the input section in the output 2638 section. */ 2639 outrel.r_addend -= osec->vma; 2640 } 2641 outrel.r_info = ELF32_R_INFO (sindx, r_type); 2642 } 2643 } 2644 2645 sreloc = elf_section_data (input_section)->sreloc; 2646 if (sreloc == NULL) 2647 abort (); 2648 2649 loc = sreloc->contents; 2650 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2651 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2652 2653 /* If this reloc is against an external symbol, we do 2654 not want to fiddle with the addend. Otherwise, we 2655 need to include the symbol value so that it becomes 2656 an addend for the dynamic reloc. */ 2657 if (! relocate) 2658 continue; 2659 } 2660 break; 2661 2662 /* Relocations for tls literal pool entries. */ 2663 case R_390_TLS_IE32: 2664 if (bfd_link_pic (info)) 2665 { 2666 Elf_Internal_Rela outrel; 2667 asection *sreloc; 2668 bfd_byte *loc; 2669 2670 outrel.r_offset = rel->r_offset 2671 + input_section->output_section->vma 2672 + input_section->output_offset; 2673 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2674 sreloc = elf_section_data (input_section)->sreloc; 2675 if (sreloc == NULL) 2676 abort (); 2677 loc = sreloc->contents; 2678 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2679 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2680 } 2681 /* Fall through. */ 2682 2683 case R_390_TLS_GD32: 2684 case R_390_TLS_GOTIE32: 2685 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2686 tls_type = GOT_UNKNOWN; 2687 if (h == NULL && local_got_offsets) 2688 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2689 else if (h != NULL) 2690 { 2691 tls_type = elf_s390_hash_entry(h)->tls_type; 2692 if (!bfd_link_pic (info) 2693 && h->dynindx == -1 2694 && tls_type >= GOT_TLS_IE) 2695 r_type = R_390_TLS_LE32; 2696 } 2697 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE) 2698 r_type = R_390_TLS_IE32; 2699 2700 if (r_type == R_390_TLS_LE32) 2701 { 2702 /* This relocation gets optimized away by the local exec 2703 access optimization. */ 2704 BFD_ASSERT (! unresolved_reloc); 2705 bfd_put_32 (output_bfd, -tpoff (info, relocation) + rel->r_addend, 2706 contents + rel->r_offset); 2707 continue; 2708 } 2709 2710 if (htab->elf.sgot == NULL) 2711 abort (); 2712 2713 if (h != NULL) 2714 off = h->got.offset; 2715 else 2716 { 2717 if (local_got_offsets == NULL) 2718 abort (); 2719 2720 off = local_got_offsets[r_symndx]; 2721 } 2722 2723 emit_tls_relocs: 2724 2725 if ((off & 1) != 0) 2726 off &= ~1; 2727 else 2728 { 2729 Elf_Internal_Rela outrel; 2730 bfd_byte *loc; 2731 int dr_type, indx; 2732 2733 if (htab->elf.srelgot == NULL) 2734 abort (); 2735 2736 outrel.r_offset = (htab->elf.sgot->output_section->vma 2737 + htab->elf.sgot->output_offset + off); 2738 2739 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2740 if (r_type == R_390_TLS_GD32) 2741 dr_type = R_390_TLS_DTPMOD; 2742 else 2743 dr_type = R_390_TLS_TPOFF; 2744 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2745 outrel.r_addend = relocation - dtpoff_base (info); 2746 else 2747 outrel.r_addend = 0; 2748 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2749 loc = htab->elf.srelgot->contents; 2750 loc += htab->elf.srelgot->reloc_count++ 2751 * sizeof (Elf32_External_Rela); 2752 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2753 2754 if (r_type == R_390_TLS_GD32) 2755 { 2756 if (indx == 0) 2757 { 2758 BFD_ASSERT (! unresolved_reloc); 2759 bfd_put_32 (output_bfd, 2760 relocation - dtpoff_base (info), 2761 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 2762 } 2763 else 2764 { 2765 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF); 2766 outrel.r_offset += GOT_ENTRY_SIZE; 2767 outrel.r_addend = 0; 2768 htab->elf.srelgot->reloc_count++; 2769 loc += sizeof (Elf32_External_Rela); 2770 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2771 } 2772 } 2773 2774 if (h != NULL) 2775 h->got.offset |= 1; 2776 else 2777 local_got_offsets[r_symndx] |= 1; 2778 } 2779 2780 if (off >= (bfd_vma) -2) 2781 abort (); 2782 if (r_type == ELF32_R_TYPE (rel->r_info)) 2783 { 2784 relocation = htab->elf.sgot->output_offset + off; 2785 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT) 2786 relocation += htab->elf.sgot->output_section->vma; 2787 unresolved_reloc = false; 2788 } 2789 else 2790 { 2791 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off, 2792 contents + rel->r_offset); 2793 continue; 2794 } 2795 break; 2796 2797 case R_390_TLS_GOTIE12: 2798 case R_390_TLS_GOTIE20: 2799 case R_390_TLS_IEENT: 2800 if (h == NULL) 2801 { 2802 if (local_got_offsets == NULL) 2803 abort(); 2804 off = local_got_offsets[r_symndx]; 2805 if (bfd_link_pic (info)) 2806 goto emit_tls_relocs; 2807 } 2808 else 2809 { 2810 off = h->got.offset; 2811 tls_type = elf_s390_hash_entry(h)->tls_type; 2812 if (bfd_link_pic (info) 2813 || h->dynindx != -1 2814 || tls_type < GOT_TLS_IE) 2815 goto emit_tls_relocs; 2816 } 2817 2818 if (htab->elf.sgot == NULL) 2819 abort (); 2820 2821 BFD_ASSERT (! unresolved_reloc); 2822 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2823 htab->elf.sgot->contents + off); 2824 relocation = htab->elf.sgot->output_offset + off; 2825 if (r_type == R_390_TLS_IEENT) 2826 relocation += htab->elf.sgot->output_section->vma; 2827 unresolved_reloc = false; 2828 break; 2829 2830 case R_390_TLS_LDM32: 2831 if (! bfd_link_pic (info)) 2832 /* The literal pool entry this relocation refers to gets ignored 2833 by the optimized code of the local exec model. Do nothing 2834 and the value will turn out zero. */ 2835 continue; 2836 2837 if (htab->elf.sgot == NULL) 2838 abort (); 2839 2840 off = htab->tls_ldm_got.offset; 2841 if (off & 1) 2842 off &= ~1; 2843 else 2844 { 2845 Elf_Internal_Rela outrel; 2846 bfd_byte *loc; 2847 2848 if (htab->elf.srelgot == NULL) 2849 abort (); 2850 2851 outrel.r_offset = (htab->elf.sgot->output_section->vma 2852 + htab->elf.sgot->output_offset + off); 2853 2854 bfd_put_32 (output_bfd, 0, 2855 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 2856 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD); 2857 outrel.r_addend = 0; 2858 loc = htab->elf.srelgot->contents; 2859 loc += htab->elf.srelgot->reloc_count++ 2860 * sizeof (Elf32_External_Rela); 2861 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2862 htab->tls_ldm_got.offset |= 1; 2863 } 2864 relocation = htab->elf.sgot->output_offset + off; 2865 unresolved_reloc = false; 2866 break; 2867 2868 case R_390_TLS_LE32: 2869 if (bfd_link_dll (info)) 2870 { 2871 /* Linking a shared library with non-fpic code requires 2872 a R_390_TLS_TPOFF relocation. */ 2873 Elf_Internal_Rela outrel; 2874 asection *sreloc; 2875 bfd_byte *loc; 2876 int indx; 2877 2878 outrel.r_offset = rel->r_offset 2879 + input_section->output_section->vma 2880 + input_section->output_offset; 2881 if (h != NULL && h->dynindx != -1) 2882 indx = h->dynindx; 2883 else 2884 indx = 0; 2885 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF); 2886 if (indx == 0) 2887 outrel.r_addend = relocation - dtpoff_base (info); 2888 else 2889 outrel.r_addend = 0; 2890 sreloc = elf_section_data (input_section)->sreloc; 2891 if (sreloc == NULL) 2892 abort (); 2893 loc = sreloc->contents; 2894 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2895 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2896 } 2897 else 2898 { 2899 BFD_ASSERT (! unresolved_reloc); 2900 bfd_put_32 (output_bfd, -tpoff (info, relocation) + rel->r_addend, 2901 contents + rel->r_offset); 2902 } 2903 continue; 2904 2905 case R_390_TLS_LDO32: 2906 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING)) 2907 relocation -= dtpoff_base (info); 2908 else 2909 /* When converting LDO to LE, we must negate. */ 2910 relocation = -tpoff (info, relocation); 2911 break; 2912 2913 /* Relocations for tls instructions. */ 2914 case R_390_TLS_LOAD: 2915 case R_390_TLS_GDCALL: 2916 case R_390_TLS_LDCALL: 2917 tls_type = GOT_UNKNOWN; 2918 if (h == NULL && local_got_offsets) 2919 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2920 else if (h != NULL) 2921 tls_type = elf_s390_hash_entry(h)->tls_type; 2922 2923 if (tls_type == GOT_TLS_GD) 2924 continue; 2925 2926 if (r_type == R_390_TLS_LOAD) 2927 { 2928 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) 2929 { 2930 /* IE->LE transition. Four valid cases: 2931 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 2932 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 2933 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 2934 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 2935 unsigned int insn, ry; 2936 2937 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 2938 if ((insn & 0xff00f000) == 0x58000000) 2939 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */ 2940 ry = (insn & 0x000f0000); 2941 else if ((insn & 0xff0f0000) == 0x58000000) 2942 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */ 2943 ry = (insn & 0x0000f000) << 4; 2944 else if ((insn & 0xff00f000) == 0x5800c000) 2945 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */ 2946 ry = (insn & 0x000f0000); 2947 else if ((insn & 0xff0f0000) == 0x580c0000) 2948 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 2949 ry = (insn & 0x0000f000) << 4; 2950 else 2951 { 2952 invalid_tls_insn (input_bfd, input_section, rel); 2953 return false; 2954 } 2955 insn = 0x18000700 | (insn & 0x00f00000) | ry; 2956 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 2957 } 2958 } 2959 else if (r_type == R_390_TLS_GDCALL) 2960 { 2961 unsigned int insn; 2962 2963 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 2964 if ((insn & 0xff000fff) != 0x4d000000 && 2965 (insn & 0xffff0000) != 0xc0e50000 && 2966 (insn & 0xff000000) != 0x0d000000) 2967 { 2968 invalid_tls_insn (input_bfd, input_section, rel); 2969 return false; 2970 } 2971 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) 2972 { 2973 if ((insn & 0xff000000) == 0x0d000000) 2974 { 2975 /* GD->LE transition. 2976 basr rx, ry -> nopr r7 */ 2977 insn = 0x07070000 | (insn & 0xffff); 2978 } 2979 else if ((insn & 0xff000000) == 0x4d000000) 2980 { 2981 /* GD->LE transition. 2982 bas %r14,0(%rx,%r13) -> bc 0,0 */ 2983 insn = 0x47000000; 2984 } 2985 else 2986 { 2987 /* GD->LE transition. 2988 brasl %r14,_tls_get_offset@plt -> brcl 0,. */ 2989 insn = 0xc0040000; 2990 bfd_put_16 (output_bfd, 0x0000, 2991 contents + rel->r_offset + 4); 2992 } 2993 } 2994 else 2995 { 2996 /* If basr is used in the pic case to invoke 2997 _tls_get_offset, something went wrong before. */ 2998 if ((insn & 0xff000000) == 0x0d000000) 2999 { 3000 invalid_tls_insn (input_bfd, input_section, rel); 3001 return false; 3002 } 3003 3004 if ((insn & 0xff000000) == 0x4d000000) 3005 { 3006 /* GD->IE transition. 3007 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */ 3008 insn = 0x5822c000; 3009 } 3010 else 3011 { 3012 /* GD->IE transition. 3013 brasl %r14,__tls_get_addr@plt -> 3014 l %r2,0(%r2,%r12) ; bcr 0,0 */ 3015 insn = 0x5822c000; 3016 bfd_put_16 (output_bfd, 0x0700, 3017 contents + rel->r_offset + 4); 3018 } 3019 } 3020 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3021 } 3022 else if (r_type == R_390_TLS_LDCALL) 3023 { 3024 if (!bfd_link_pic (info)) 3025 { 3026 unsigned int insn; 3027 3028 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3029 if ((insn & 0xff000fff) != 0x4d000000 && 3030 (insn & 0xffff0000) != 0xc0e50000 && 3031 (insn & 0xff000000) != 0x0d000000) 3032 { 3033 invalid_tls_insn (input_bfd, input_section, rel); 3034 return false; 3035 } 3036 3037 if ((insn & 0xff000000) == 0x0d000000) 3038 { 3039 /* LD->LE transition. 3040 basr rx, ry -> nopr r7 */ 3041 insn = 0x07070000 | (insn & 0xffff); 3042 } 3043 else if ((insn & 0xff000000) == 0x4d000000) 3044 { 3045 /* LD->LE transition. 3046 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3047 insn = 0x47000000; 3048 } 3049 else 3050 { 3051 /* LD->LE transition. 3052 brasl %r14,__tls_get_offset@plt -> brcl 0,. */ 3053 insn = 0xc0040000; 3054 bfd_put_16 (output_bfd, 0x0000, 3055 contents + rel->r_offset + 4); 3056 } 3057 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3058 } 3059 } 3060 continue; 3061 3062 default: 3063 break; 3064 } 3065 3066 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3067 because such sections are not SEC_ALLOC and thus ld.so will 3068 not process them. */ 3069 if (unresolved_reloc 3070 && !((input_section->flags & SEC_DEBUGGING) != 0 3071 && h->def_dynamic) 3072 && _bfd_elf_section_offset (output_bfd, info, input_section, 3073 rel->r_offset) != (bfd_vma) -1) 3074 _bfd_error_handler 3075 /* xgettext:c-format */ 3076 (_("%pB(%pA+%#" PRIx64 "): " 3077 "unresolvable %s relocation against symbol `%s'"), 3078 input_bfd, 3079 input_section, 3080 (uint64_t) rel->r_offset, 3081 howto->name, 3082 h->root.root.string); 3083 3084 do_relocation: 3085 3086 /* When applying a 24 bit reloc we need to start one byte 3087 earlier. Otherwise the 32 bit get/put bfd operations might 3088 access a byte after the actual section. */ 3089 if (r_type == R_390_PC24DBL 3090 || r_type == R_390_PLT24DBL) 3091 rel->r_offset--; 3092 3093 if (r_type == R_390_20 3094 || r_type == R_390_GOT20 3095 || r_type == R_390_GOTPLT20 3096 || r_type == R_390_TLS_GOTIE20) 3097 { 3098 relocation += rel->r_addend; 3099 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3100 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3101 contents, rel->r_offset, 3102 relocation, 0); 3103 } 3104 else 3105 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3106 contents, rel->r_offset, 3107 relocation, rel->r_addend); 3108 3109 if (r != bfd_reloc_ok) 3110 { 3111 const char *name; 3112 3113 if (h != NULL) 3114 name = h->root.root.string; 3115 else 3116 { 3117 name = bfd_elf_string_from_elf_section (input_bfd, 3118 symtab_hdr->sh_link, 3119 sym->st_name); 3120 if (name == NULL) 3121 return false; 3122 if (*name == '\0') 3123 name = bfd_section_name (sec); 3124 } 3125 3126 if (r == bfd_reloc_overflow) 3127 (*info->callbacks->reloc_overflow) 3128 (info, (h ? &h->root : NULL), name, howto->name, 3129 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3130 else 3131 { 3132 _bfd_error_handler 3133 /* xgettext:c-format */ 3134 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 3135 input_bfd, input_section, 3136 (uint64_t) rel->r_offset, name, (int) r); 3137 return false; 3138 } 3139 } 3140 } 3141 3142 return true; 3143 } 3144 3145 /* Generate the PLT slots together with the dynamic relocations needed 3146 for IFUNC symbols. */ 3147 3148 static void 3149 elf_s390_finish_ifunc_symbol (bfd *output_bfd, 3150 struct bfd_link_info *info, 3151 struct elf_link_hash_entry *h, 3152 struct elf_s390_link_hash_table *htab, 3153 bfd_vma iplt_offset, 3154 bfd_vma resolver_address) 3155 { 3156 bfd_vma iplt_index; 3157 bfd_vma got_offset; 3158 bfd_vma igotiplt_offset; 3159 Elf_Internal_Rela rela; 3160 bfd_byte *loc; 3161 asection *plt, *gotplt, *relplt; 3162 bfd_vma relative_offset; 3163 3164 if (htab->elf.iplt == NULL 3165 || htab->elf.igotplt == NULL 3166 || htab->elf.irelplt == NULL) 3167 abort (); 3168 3169 gotplt = htab->elf.igotplt; 3170 relplt = htab->elf.irelplt; 3171 3172 /* Index of the PLT slot within iplt section. */ 3173 iplt_index = iplt_offset / PLT_ENTRY_SIZE; 3174 plt = htab->elf.iplt; 3175 /* Offset into the igot.plt section. */ 3176 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE; 3177 /* Offset into the got section. */ 3178 got_offset = igotiplt_offset + gotplt->output_offset; 3179 3180 /* S390 uses halfwords for relative branch calc! */ 3181 relative_offset = - (plt->output_offset + 3182 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2; 3183 /* If offset is > 32768, branch to a previous branch 3184 390 can only handle +-64 K jumps. */ 3185 if ( -32768 > (int) relative_offset ) 3186 relative_offset 3187 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3188 3189 /* Fill in the entry in the procedure linkage table. */ 3190 if (!bfd_link_pic (info)) 3191 { 3192 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry, 3193 PLT_ENTRY_SIZE); 3194 3195 /* Adjust jump to the first plt entry. */ 3196 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3197 plt->contents + iplt_offset + 20); 3198 3199 /* Push the GOT offset field. */ 3200 bfd_put_32 (output_bfd, 3201 (gotplt->output_section->vma 3202 + got_offset), 3203 plt->contents + iplt_offset + 24); 3204 } 3205 else if (got_offset < 4096) 3206 { 3207 /* The GOT offset is small enough to be used directly as 3208 displacement. */ 3209 memcpy (plt->contents + iplt_offset, 3210 elf_s390_plt_pic12_entry, 3211 PLT_ENTRY_SIZE); 3212 3213 /* Put in the GOT offset as displacement value. The 0xc000 3214 value comes from the first word of the plt entry. Look 3215 at the elf_s390_plt_pic16_entry content. */ 3216 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3217 plt->contents + iplt_offset + 2); 3218 3219 /* Adjust the jump to the first plt entry. */ 3220 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3221 plt->contents + iplt_offset + 20); 3222 } 3223 else if (got_offset < 32768) 3224 { 3225 /* The GOT offset is too big for a displacement but small 3226 enough to be a signed 16 bit immediate value as it can be 3227 used in an lhi instruction. */ 3228 memcpy (plt->contents + iplt_offset, 3229 elf_s390_plt_pic16_entry, 3230 PLT_ENTRY_SIZE); 3231 3232 /* Put in the GOT offset for the lhi instruction. */ 3233 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3234 plt->contents + iplt_offset + 2); 3235 3236 /* Adjust the jump to the first plt entry. */ 3237 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3238 plt->contents + iplt_offset + 20); 3239 } 3240 else 3241 { 3242 memcpy (plt->contents + iplt_offset, 3243 elf_s390_plt_pic_entry, 3244 PLT_ENTRY_SIZE); 3245 3246 /* Adjust the jump to the first plt entry. */ 3247 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3248 plt->contents + iplt_offset + 20); 3249 3250 /* Push the GOT offset field. */ 3251 bfd_put_32 (output_bfd, got_offset, 3252 plt->contents + iplt_offset + 24); 3253 } 3254 /* Insert offset into reloc. table here. */ 3255 bfd_put_32 (output_bfd, relplt->output_offset + 3256 iplt_index * RELA_ENTRY_SIZE, 3257 plt->contents + iplt_offset + 28); 3258 3259 /* Fill in the entry in the global offset table. 3260 Points to instruction after GOT offset. */ 3261 bfd_put_32 (output_bfd, 3262 (plt->output_section->vma 3263 + plt->output_offset 3264 + iplt_offset 3265 + 12), 3266 gotplt->contents + igotiplt_offset); 3267 3268 /* Fill in the entry in the .rela.plt section. */ 3269 rela.r_offset = gotplt->output_section->vma + got_offset; 3270 3271 if (!h 3272 || h->dynindx == -1 3273 || ((bfd_link_executable (info) 3274 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3275 && h->def_regular)) 3276 { 3277 /* The symbol can be locally resolved. */ 3278 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 3279 rela.r_addend = resolver_address; 3280 } 3281 else 3282 { 3283 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3284 rela.r_addend = 0; 3285 } 3286 3287 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE; 3288 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3289 } 3290 3291 /* Finish up dynamic symbol handling. We set the contents of various 3292 dynamic sections here. */ 3293 3294 static bool 3295 elf_s390_finish_dynamic_symbol (bfd *output_bfd, 3296 struct bfd_link_info *info, 3297 struct elf_link_hash_entry *h, 3298 Elf_Internal_Sym *sym) 3299 { 3300 struct elf_s390_link_hash_table *htab; 3301 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; 3302 3303 htab = elf_s390_hash_table (info); 3304 3305 if (h->plt.offset != (bfd_vma) -1) 3306 { 3307 bfd_vma plt_index; 3308 bfd_vma got_offset; 3309 Elf_Internal_Rela rela; 3310 bfd_byte *loc; 3311 bfd_vma relative_offset; 3312 3313 /* This symbol has an entry in the procedure linkage table. Set 3314 it up. */ 3315 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 3316 { 3317 elf_s390_finish_ifunc_symbol (output_bfd, info, h, 3318 htab, h->plt.offset, 3319 eh->ifunc_resolver_address + 3320 eh->ifunc_resolver_section->output_offset + 3321 eh->ifunc_resolver_section->output_section->vma); 3322 /* Do not return yet. Handling of explicit GOT slots of 3323 IFUNC symbols is below. */ 3324 } 3325 else 3326 { 3327 if (h->dynindx == -1 3328 || htab->elf.splt == NULL 3329 || htab->elf.sgotplt == NULL 3330 || htab->elf.srelplt == NULL) 3331 abort (); 3332 3333 /* Calc. index no. 3334 Current offset - size first entry / entry size. */ 3335 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3336 3337 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 3338 addr & GOT addr. */ 3339 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3340 3341 /* S390 uses halfwords for relative branch calc! */ 3342 relative_offset = - ((PLT_FIRST_ENTRY_SIZE + 3343 (PLT_ENTRY_SIZE * plt_index) + 18) / 2); 3344 /* If offset is > 32768, branch to a previous branch 3345 390 can only handle +-64 K jumps. */ 3346 if ( -32768 > (int) relative_offset ) 3347 relative_offset 3348 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3349 3350 /* Fill in the entry in the procedure linkage table. */ 3351 if (!bfd_link_pic (info)) 3352 { 3353 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry, 3354 PLT_ENTRY_SIZE); 3355 3356 /* Adjust jump to the first plt entry. */ 3357 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3358 htab->elf.splt->contents + h->plt.offset + 20); 3359 3360 /* Push the GOT offset field. */ 3361 bfd_put_32 (output_bfd, 3362 (htab->elf.sgotplt->output_section->vma 3363 + htab->elf.sgotplt->output_offset 3364 + got_offset), 3365 htab->elf.splt->contents + h->plt.offset + 24); 3366 } 3367 else if (got_offset < 4096) 3368 { 3369 /* The GOT offset is small enough to be used directly as 3370 displacement. */ 3371 memcpy (htab->elf.splt->contents + h->plt.offset, 3372 elf_s390_plt_pic12_entry, 3373 PLT_ENTRY_SIZE); 3374 3375 /* Put in the GOT offset as displacement value. The 0xc000 3376 value comes from the first word of the plt entry. Look 3377 at the elf_s390_plt_pic12_entry content. */ 3378 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3379 htab->elf.splt->contents + h->plt.offset + 2); 3380 3381 /* Adjust the jump to the first plt entry. */ 3382 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3383 htab->elf.splt->contents + h->plt.offset + 20); 3384 } 3385 else if (got_offset < 32768) 3386 { 3387 /* The GOT offset is too big for a displacement but small 3388 enough to be a signed 16 bit immediate value as it can be 3389 used in an lhi instruction. */ 3390 memcpy (htab->elf.splt->contents + h->plt.offset, 3391 elf_s390_plt_pic16_entry, 3392 PLT_ENTRY_SIZE); 3393 3394 /* Put in the GOT offset for the lhi instruction. */ 3395 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3396 htab->elf.splt->contents + h->plt.offset + 2); 3397 3398 /* Adjust the jump to the first plt entry. */ 3399 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3400 htab->elf.splt->contents + h->plt.offset + 20); 3401 } 3402 else 3403 { 3404 memcpy (htab->elf.splt->contents + h->plt.offset, 3405 elf_s390_plt_pic_entry, 3406 PLT_ENTRY_SIZE); 3407 3408 /* Adjust the jump to the first plt entry. */ 3409 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3410 htab->elf.splt->contents + h->plt.offset + 20); 3411 3412 /* Push the GOT offset field. */ 3413 bfd_put_32 (output_bfd, got_offset, 3414 htab->elf.splt->contents + h->plt.offset + 24); 3415 } 3416 /* Insert offset into reloc. table here. */ 3417 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 3418 htab->elf.splt->contents + h->plt.offset + 28); 3419 3420 /* Fill in the entry in the global offset table. 3421 Points to instruction after GOT offset. */ 3422 bfd_put_32 (output_bfd, 3423 (htab->elf.splt->output_section->vma 3424 + htab->elf.splt->output_offset 3425 + h->plt.offset 3426 + 12), 3427 htab->elf.sgotplt->contents + got_offset); 3428 3429 /* Fill in the entry in the .rela.plt section. */ 3430 rela.r_offset = (htab->elf.sgotplt->output_section->vma 3431 + htab->elf.sgotplt->output_offset 3432 + got_offset); 3433 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3434 rela.r_addend = 0; 3435 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela); 3436 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3437 3438 if (!h->def_regular) 3439 { 3440 /* Mark the symbol as undefined, rather than as defined in 3441 the .plt section. Leave the value alone. This is a clue 3442 for the dynamic linker, to make function pointer 3443 comparisons work between an application and shared 3444 library. */ 3445 sym->st_shndx = SHN_UNDEF; 3446 } 3447 } 3448 } 3449 3450 if (h->got.offset != (bfd_vma) -1 3451 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3452 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3453 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3454 { 3455 Elf_Internal_Rela rela; 3456 bfd_byte *loc; 3457 3458 /* This symbol has an entry in the global offset table. Set it 3459 up. */ 3460 3461 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3462 abort (); 3463 3464 rela.r_offset = (htab->elf.sgot->output_section->vma 3465 + htab->elf.sgot->output_offset 3466 + (h->got.offset &~ (bfd_vma) 1)); 3467 3468 /* If this is a static link, or it is a -Bsymbolic link and the 3469 symbol is defined locally or was forced to be local because 3470 of a version file, we just want to emit a RELATIVE reloc. 3471 The entry in the global offset table will already have been 3472 initialized in the relocate_section function. */ 3473 if (h->def_regular && s390_is_ifunc_symbol_p (h)) 3474 { 3475 if (bfd_link_pic (info)) 3476 { 3477 /* An explicit GOT slot usage needs GLOB_DAT. If the 3478 symbol references local the implicit got.iplt slot 3479 will be used and the IRELATIVE reloc has been created 3480 above. */ 3481 goto do_glob_dat; 3482 } 3483 else 3484 { 3485 /* For non-shared objects explicit GOT slots must be 3486 filled with the PLT slot address for pointer 3487 equality reasons. */ 3488 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma 3489 + htab->elf.iplt->output_offset 3490 + h->plt.offset), 3491 htab->elf.sgot->contents + h->got.offset); 3492 return true; 3493 } 3494 } 3495 else if (bfd_link_pic (info) 3496 && SYMBOL_REFERENCES_LOCAL (info, h)) 3497 { 3498 if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 3499 return true; 3500 3501 /* If this is a static link, or it is a -Bsymbolic link and 3502 the symbol is defined locally or was forced to be local 3503 because of a version file, we just want to emit a 3504 RELATIVE reloc. The entry in the global offset table 3505 will already have been initialized in the 3506 relocate_section function. */ 3507 if (!(h->def_regular || ELF_COMMON_DEF_P (h))) 3508 return false; 3509 BFD_ASSERT((h->got.offset & 1) != 0); 3510 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 3511 rela.r_addend = (h->root.u.def.value 3512 + h->root.u.def.section->output_section->vma 3513 + h->root.u.def.section->output_offset); 3514 } 3515 else 3516 { 3517 BFD_ASSERT((h->got.offset & 1) == 0); 3518 do_glob_dat: 3519 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset); 3520 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT); 3521 rela.r_addend = 0; 3522 } 3523 3524 loc = htab->elf.srelgot->contents; 3525 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3526 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3527 } 3528 3529 if (h->needs_copy) 3530 { 3531 Elf_Internal_Rela rela; 3532 asection *s; 3533 bfd_byte *loc; 3534 3535 /* This symbols needs a copy reloc. Set it up. */ 3536 3537 if (h->dynindx == -1 3538 || (h->root.type != bfd_link_hash_defined 3539 && h->root.type != bfd_link_hash_defweak) 3540 || htab->elf.srelbss == NULL 3541 || htab->elf.sreldynrelro == NULL) 3542 abort (); 3543 3544 rela.r_offset = (h->root.u.def.value 3545 + h->root.u.def.section->output_section->vma 3546 + h->root.u.def.section->output_offset); 3547 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY); 3548 rela.r_addend = 0; 3549 if (h->root.u.def.section == htab->elf.sdynrelro) 3550 s = htab->elf.sreldynrelro; 3551 else 3552 s = htab->elf.srelbss; 3553 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 3554 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3555 } 3556 3557 /* Mark some specially defined symbols as absolute. */ 3558 if (h == htab->elf.hdynamic 3559 || h == htab->elf.hgot 3560 || h == htab->elf.hplt) 3561 sym->st_shndx = SHN_ABS; 3562 3563 return true; 3564 } 3565 3566 /* Used to decide how to sort relocs in an optimal manner for the 3567 dynamic linker, before writing them out. */ 3568 3569 static enum elf_reloc_type_class 3570 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3571 const asection *rel_sec ATTRIBUTE_UNUSED, 3572 const Elf_Internal_Rela *rela) 3573 { 3574 bfd *abfd = info->output_bfd; 3575 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3576 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); 3577 unsigned long r_symndx = ELF32_R_SYM (rela->r_info); 3578 Elf_Internal_Sym sym; 3579 3580 if (htab->elf.dynsym == NULL 3581 || !bed->s->swap_symbol_in (abfd, 3582 (htab->elf.dynsym->contents 3583 + r_symndx * bed->s->sizeof_sym), 3584 0, &sym)) 3585 abort (); 3586 3587 /* Check relocation against STT_GNU_IFUNC symbol. */ 3588 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 3589 return reloc_class_ifunc; 3590 3591 switch ((int) ELF32_R_TYPE (rela->r_info)) 3592 { 3593 case R_390_RELATIVE: 3594 return reloc_class_relative; 3595 case R_390_JMP_SLOT: 3596 return reloc_class_plt; 3597 case R_390_COPY: 3598 return reloc_class_copy; 3599 default: 3600 return reloc_class_normal; 3601 } 3602 } 3603 3604 /* Finish up the dynamic sections. */ 3605 3606 static bool 3607 elf_s390_finish_dynamic_sections (bfd *output_bfd, 3608 struct bfd_link_info *info) 3609 { 3610 struct elf_s390_link_hash_table *htab; 3611 bfd *dynobj; 3612 asection *sdyn; 3613 bfd *ibfd; 3614 unsigned int i; 3615 3616 htab = elf_s390_hash_table (info); 3617 dynobj = htab->elf.dynobj; 3618 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3619 3620 if (htab->elf.dynamic_sections_created) 3621 { 3622 Elf32_External_Dyn *dyncon, *dynconend; 3623 3624 if (sdyn == NULL || htab->elf.sgot == NULL) 3625 abort (); 3626 3627 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3628 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3629 for (; dyncon < dynconend; dyncon++) 3630 { 3631 Elf_Internal_Dyn dyn; 3632 asection *s; 3633 3634 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3635 3636 switch (dyn.d_tag) 3637 { 3638 default: 3639 continue; 3640 3641 case DT_PLTGOT: 3642 s = htab->elf.sgotplt; 3643 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3644 break; 3645 3646 case DT_JMPREL: 3647 s = htab->elf.srelplt; 3648 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3649 break; 3650 3651 case DT_PLTRELSZ: 3652 dyn.d_un.d_val = htab->elf.srelplt->size; 3653 if (htab->elf.irelplt) 3654 dyn.d_un.d_val += htab->elf.irelplt->size; 3655 break; 3656 } 3657 3658 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3659 } 3660 3661 /* Fill in the special first entry in the procedure linkage table. */ 3662 if (htab->elf.splt && htab->elf.splt->size > 0) 3663 { 3664 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE); 3665 if (bfd_link_pic (info)) 3666 { 3667 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry, 3668 PLT_FIRST_ENTRY_SIZE); 3669 } 3670 else 3671 { 3672 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry, 3673 PLT_FIRST_ENTRY_SIZE); 3674 bfd_put_32 (output_bfd, 3675 htab->elf.sgotplt->output_section->vma 3676 + htab->elf.sgotplt->output_offset, 3677 htab->elf.splt->contents + 24); 3678 } 3679 elf_section_data (htab->elf.splt->output_section) 3680 ->this_hdr.sh_entsize = 4; 3681 } 3682 3683 } 3684 3685 if (htab->elf.sgotplt) 3686 { 3687 /* Fill in the first three entries in the global offset table. */ 3688 if (htab->elf.sgotplt->size > 0) 3689 { 3690 bfd_put_32 (output_bfd, 3691 (sdyn == NULL ? (bfd_vma) 0 3692 : sdyn->output_section->vma + sdyn->output_offset), 3693 htab->elf.sgotplt->contents); 3694 /* One entry for shared object struct ptr. */ 3695 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4); 3696 /* One entry for _dl_runtime_resolve. */ 3697 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8); 3698 } 3699 3700 elf_section_data (htab->elf.sgotplt->output_section) 3701 ->this_hdr.sh_entsize = 4; 3702 } 3703 /* Finish dynamic symbol for local IFUNC symbols. */ 3704 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 3705 { 3706 struct plt_entry *local_plt; 3707 Elf_Internal_Sym *isym; 3708 Elf_Internal_Shdr *symtab_hdr; 3709 3710 symtab_hdr = &elf_symtab_hdr (ibfd); 3711 3712 if (!is_s390_elf (ibfd)) 3713 continue; 3714 3715 local_plt = elf_s390_local_plt (ibfd); 3716 if (local_plt != NULL) 3717 for (i = 0; i < symtab_hdr->sh_info; i++) 3718 { 3719 if (local_plt[i].plt.offset != (bfd_vma) -1) 3720 { 3721 asection *sec = local_plt[i].sec; 3722 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i); 3723 if (isym == NULL) 3724 return false; 3725 3726 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 3727 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab, 3728 local_plt[i].plt.offset, 3729 isym->st_value 3730 + sec->output_section->vma 3731 + sec->output_offset); 3732 3733 } 3734 } 3735 } 3736 return true; 3737 } 3738 3739 /* Support for core dump NOTE sections. */ 3741 3742 static bool 3743 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note) 3744 { 3745 int offset; 3746 unsigned int size; 3747 3748 switch (note->descsz) 3749 { 3750 default: 3751 return false; 3752 3753 case 224: /* S/390 Linux. */ 3754 /* pr_cursig */ 3755 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 3756 3757 /* pr_pid */ 3758 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 3759 3760 /* pr_reg */ 3761 offset = 72; 3762 size = 144; 3763 break; 3764 } 3765 3766 /* Make a ".reg/999" section. */ 3767 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3768 size, note->descpos + offset); 3769 } 3770 3771 static bool 3772 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 3773 { 3774 switch (note->descsz) 3775 { 3776 default: 3777 return false; 3778 3779 case 124: /* sizeof(struct elf_prpsinfo) on s390 */ 3780 elf_tdata (abfd)->core->pid 3781 = bfd_get_32 (abfd, note->descdata + 12); 3782 elf_tdata (abfd)->core->program 3783 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 3784 elf_tdata (abfd)->core->command 3785 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 3786 break; 3787 } 3788 3789 /* Note that for some reason, a spurious space is tacked 3790 onto the end of the args in some (at least one anyway) 3791 implementations, so strip it off if it exists. */ 3792 3793 { 3794 char *command = elf_tdata (abfd)->core->command; 3795 int n = strlen (command); 3796 3797 if (0 < n && command[n - 1] == ' ') 3798 command[n - 1] = '\0'; 3799 } 3800 3801 return true; 3802 } 3803 3804 static char * 3805 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz, 3806 int note_type, ...) 3807 { 3808 va_list ap; 3809 3810 switch (note_type) 3811 { 3812 default: 3813 return NULL; 3814 3815 case NT_PRPSINFO: 3816 { 3817 char data[124] ATTRIBUTE_NONSTRING = { 0 }; 3818 const char *fname, *psargs; 3819 3820 va_start (ap, note_type); 3821 fname = va_arg (ap, const char *); 3822 psargs = va_arg (ap, const char *); 3823 va_end (ap); 3824 3825 strncpy (data + 28, fname, 16); 3826 #if GCC_VERSION == 8000 || GCC_VERSION == 8001 3827 DIAGNOSTIC_PUSH; 3828 /* GCC 8.0 and 8.1 warn about 80 equals destination size with 3829 -Wstringop-truncation: 3830 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643 3831 */ 3832 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION; 3833 #endif 3834 strncpy (data + 44, psargs, 80); 3835 #if GCC_VERSION == 8000 || GCC_VERSION == 8001 3836 DIAGNOSTIC_POP; 3837 #endif 3838 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3839 &data, sizeof (data)); 3840 } 3841 3842 case NT_PRSTATUS: 3843 { 3844 char data[224] = { 0 }; 3845 long pid; 3846 int cursig; 3847 const void *gregs; 3848 3849 va_start (ap, note_type); 3850 pid = va_arg (ap, long); 3851 cursig = va_arg (ap, int); 3852 gregs = va_arg (ap, const void *); 3853 va_end (ap); 3854 3855 bfd_put_16 (abfd, cursig, data + 12); 3856 bfd_put_32 (abfd, pid, data + 24); 3857 memcpy (data + 72, gregs, 144); 3858 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3859 &data, sizeof (data)); 3860 } 3861 } 3862 /* NOTREACHED */ 3863 } 3864 3865 /* Return address for Ith PLT stub in section PLT, for relocation REL 3867 or (bfd_vma) -1 if it should not be included. */ 3868 3869 static bfd_vma 3870 elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3871 const arelent *rel ATTRIBUTE_UNUSED) 3872 { 3873 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3874 } 3875 3876 /* Merge backend specific data from an object file to the output 3877 object file when linking. */ 3878 3879 static bool 3880 elf32_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 3881 { 3882 bfd *obfd = info->output_bfd; 3883 3884 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd)) 3885 return true; 3886 3887 if (!elf_s390_merge_obj_attributes (ibfd, info)) 3888 return false; 3889 3890 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags; 3891 return true; 3892 } 3893 3894 3895 #define TARGET_BIG_SYM s390_elf32_vec 3896 #define TARGET_BIG_NAME "elf32-s390" 3897 #define ELF_ARCH bfd_arch_s390 3898 #define ELF_TARGET_ID S390_ELF_DATA 3899 #define ELF_MACHINE_CODE EM_S390 3900 #define ELF_MACHINE_ALT1 EM_S390_OLD 3901 #define ELF_MAXPAGESIZE 0x1000 3902 3903 #define elf_backend_can_gc_sections 1 3904 #define elf_backend_can_refcount 1 3905 #define elf_backend_want_got_plt 1 3906 #define elf_backend_plt_readonly 1 3907 #define elf_backend_want_plt_sym 0 3908 #define elf_backend_got_header_size 12 3909 #define elf_backend_want_dynrelro 1 3910 #define elf_backend_rela_normal 1 3911 3912 #define elf_info_to_howto elf_s390_info_to_howto 3913 3914 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name 3915 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create 3916 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3917 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 3918 3919 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data 3920 3921 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3922 #define elf_backend_check_relocs elf_s390_check_relocs 3923 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3924 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 3925 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3926 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3927 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3928 #define elf_backend_reloc_type_class elf_s390_reloc_type_class 3929 #define elf_backend_relocate_section elf_s390_relocate_section 3930 #define elf_backend_late_size_sections elf_s390_late_size_sections 3931 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 3932 #define elf_backend_grok_prstatus elf_s390_grok_prstatus 3933 #define elf_backend_grok_psinfo elf_s390_grok_psinfo 3934 #define elf_backend_write_core_note elf_s390_write_core_note 3935 #define elf_backend_plt_sym_val elf_s390_plt_sym_val 3936 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p 3937 3938 #define bfd_elf32_mkobject elf_s390_mkobject 3939 #define elf_backend_object_p elf_s390_object_p 3940 3941 #define elf_backend_linux_prpsinfo32_ugid16 true 3942 3943 #include "elf32-target.h" 3944
Indexes created Thu Apr 16 00:22:31 UTC 2026