elf64-s390.c revision 1.11
1 /* IBM S/390-specific support for 64-bit ELF 2 Copyright (C) 2000-2024 Free Software Foundation, Inc. 3 Contributed Martin Schwidefsky (schwidefsky (at) de.ibm.com). 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 "elf-s390.h" 29 #include <stdarg.h> 30 31 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value 32 from smaller values. Start with zero, widen, *then* decrement. */ 33 #define MINUS_ONE (((bfd_vma)0) - 1) 34 35 static bfd_reloc_status_type 36 s390_tls_reloc (bfd *, arelent *, asymbol *, void *, 37 asection *, bfd *, char **); 38 static bfd_reloc_status_type 39 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *, 40 asection *, bfd *, char **); 41 42 /* The relocation "howto" table. */ 43 static reloc_howto_type elf_howto_table[] = 44 { 45 HOWTO (R_390_NONE, /* type */ 46 0, /* rightshift */ 47 0, /* size */ 48 0, /* bitsize */ 49 false, /* pc_relative */ 50 0, /* bitpos */ 51 complain_overflow_dont, /* complain_on_overflow */ 52 bfd_elf_generic_reloc, /* special_function */ 53 "R_390_NONE", /* name */ 54 false, /* partial_inplace */ 55 0, /* src_mask */ 56 0, /* dst_mask */ 57 false), /* pcrel_offset */ 58 59 HOWTO(R_390_8, 0, 1, 8, false, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false), 61 HOWTO(R_390_12, 0, 2, 12, false, 0, complain_overflow_dont, 62 bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false), 63 HOWTO(R_390_16, 0, 2, 16, false, 0, complain_overflow_bitfield, 64 bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false), 65 HOWTO(R_390_32, 0, 4, 32, false, 0, complain_overflow_bitfield, 66 bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false), 67 HOWTO(R_390_PC32, 0, 4, 32, true, 0, complain_overflow_bitfield, 68 bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true), 69 HOWTO(R_390_GOT12, 0, 2, 12, false, 0, complain_overflow_bitfield, 70 bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false), 71 HOWTO(R_390_GOT32, 0, 4, 32, false, 0, complain_overflow_bitfield, 72 bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false), 73 HOWTO(R_390_PLT32, 0, 4, 32, true, 0, complain_overflow_bitfield, 74 bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true), 75 HOWTO(R_390_COPY, 0, 8, 64, false, 0, complain_overflow_bitfield, 76 bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false), 77 HOWTO(R_390_GLOB_DAT, 0, 8, 64, false, 0, complain_overflow_bitfield, 78 bfd_elf_generic_reloc, "R_390_GLOB_DAT", false, 0,MINUS_ONE, false), 79 HOWTO(R_390_JMP_SLOT, 0, 8, 64, false, 0, complain_overflow_bitfield, 80 bfd_elf_generic_reloc, "R_390_JMP_SLOT", false, 0,MINUS_ONE, false), 81 HOWTO(R_390_RELATIVE, 0, 8, 64, true, 0, complain_overflow_bitfield, 82 bfd_elf_generic_reloc, "R_390_RELATIVE", false, 0,MINUS_ONE, false), 83 HOWTO(R_390_GOTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield, 84 bfd_elf_generic_reloc, "R_390_GOTOFF32", false, 0,MINUS_ONE, false), 85 HOWTO(R_390_GOTPC, 0, 8, 64, true, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true), 87 HOWTO(R_390_GOT16, 0, 2, 16, false, 0, complain_overflow_bitfield, 88 bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false), 89 HOWTO(R_390_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield, 90 bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true), 91 HOWTO(R_390_PC16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true), 93 HOWTO(R_390_PLT16DBL, 1, 2, 16, true, 0, complain_overflow_bitfield, 94 bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true), 95 HOWTO(R_390_PC32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield, 96 bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true), 97 HOWTO(R_390_PLT32DBL, 1, 4, 32, true, 0, complain_overflow_bitfield, 98 bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true), 99 HOWTO(R_390_GOTPCDBL, 1, 4, 32, true, 0, complain_overflow_bitfield, 100 bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true), 101 HOWTO(R_390_64, 0, 8, 64, false, 0, complain_overflow_bitfield, 102 bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false), 103 HOWTO(R_390_PC64, 0, 8, 64, true, 0, complain_overflow_bitfield, 104 bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true), 105 HOWTO(R_390_GOT64, 0, 8, 64, false, 0, complain_overflow_bitfield, 106 bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false), 107 HOWTO(R_390_PLT64, 0, 8, 64, true, 0, complain_overflow_bitfield, 108 bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true), 109 HOWTO(R_390_GOTENT, 1, 4, 32, true, 0, complain_overflow_bitfield, 110 bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true), 111 HOWTO(R_390_GOTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield, 112 bfd_elf_generic_reloc, "R_390_GOTOFF16", false, 0,0x0000ffff, false), 113 HOWTO(R_390_GOTOFF64, 0, 8, 64, false, 0, complain_overflow_bitfield, 114 bfd_elf_generic_reloc, "R_390_GOTOFF64", false, 0,MINUS_ONE, false), 115 HOWTO(R_390_GOTPLT12, 0, 2, 12, false, 0, complain_overflow_dont, 116 bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false), 117 HOWTO(R_390_GOTPLT16, 0, 2, 16, false, 0, complain_overflow_bitfield, 118 bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false), 119 HOWTO(R_390_GOTPLT32, 0, 4, 32, false, 0, complain_overflow_bitfield, 120 bfd_elf_generic_reloc, "R_390_GOTPLT32", false, 0,0xffffffff, false), 121 HOWTO(R_390_GOTPLT64, 0, 8, 64, false, 0, complain_overflow_bitfield, 122 bfd_elf_generic_reloc, "R_390_GOTPLT64", false, 0,MINUS_ONE, false), 123 HOWTO(R_390_GOTPLTENT, 1, 4, 32, true, 0, complain_overflow_bitfield, 124 bfd_elf_generic_reloc, "R_390_GOTPLTENT",false, 0,MINUS_ONE, true), 125 HOWTO(R_390_PLTOFF16, 0, 2, 16, false, 0, complain_overflow_bitfield, 126 bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false), 127 HOWTO(R_390_PLTOFF32, 0, 4, 32, false, 0, complain_overflow_bitfield, 128 bfd_elf_generic_reloc, "R_390_PLTOFF32", false, 0,0xffffffff, false), 129 HOWTO(R_390_PLTOFF64, 0, 8, 64, false, 0, complain_overflow_bitfield, 130 bfd_elf_generic_reloc, "R_390_PLTOFF64", false, 0,MINUS_ONE, false), 131 HOWTO(R_390_TLS_LOAD, 0, 0, 0, false, 0, complain_overflow_dont, 132 s390_tls_reloc, "R_390_TLS_LOAD", false, 0, 0, false), 133 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, false, 0, complain_overflow_dont, 134 s390_tls_reloc, "R_390_TLS_GDCALL", false, 0, 0, false), 135 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, false, 0, complain_overflow_dont, 136 s390_tls_reloc, "R_390_TLS_LDCALL", false, 0, 0, false), 137 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */ 138 HOWTO(R_390_TLS_GD64, 0, 8, 64, false, 0, complain_overflow_bitfield, 139 bfd_elf_generic_reloc, "R_390_TLS_GD64", false, 0, MINUS_ONE, false), 140 HOWTO(R_390_TLS_GOTIE12, 0, 2, 12, false, 0, complain_overflow_dont, 141 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", false, 0, 0x00000fff, false), 142 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */ 143 HOWTO(R_390_TLS_GOTIE64, 0, 8, 64, false, 0, complain_overflow_bitfield, 144 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", false, 0, MINUS_ONE, false), 145 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */ 146 HOWTO(R_390_TLS_LDM64, 0, 8, 64, false, 0, complain_overflow_bitfield, 147 bfd_elf_generic_reloc, "R_390_TLS_LDM64", false, 0, MINUS_ONE, false), 148 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */ 149 HOWTO(R_390_TLS_IE64, 0, 8, 64, false, 0, complain_overflow_bitfield, 150 bfd_elf_generic_reloc, "R_390_TLS_IE64", false, 0, MINUS_ONE, false), 151 HOWTO(R_390_TLS_IEENT, 1, 4, 32, true, 0, complain_overflow_bitfield, 152 bfd_elf_generic_reloc, "R_390_TLS_IEENT", false, 0, MINUS_ONE, true), 153 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */ 154 HOWTO(R_390_TLS_LE64, 0, 4, 32, false, 0, complain_overflow_bitfield, 155 bfd_elf_generic_reloc, "R_390_TLS_LE64", false, 0, MINUS_ONE, false), 156 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */ 157 HOWTO(R_390_TLS_LDO64, 0, 8, 64, false, 0, complain_overflow_bitfield, 158 bfd_elf_generic_reloc, "R_390_TLS_LDO64", false, 0, MINUS_ONE, false), 159 HOWTO(R_390_TLS_DTPMOD, 0, 8, 64, false, 0, complain_overflow_bitfield, 160 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", false, 0, MINUS_ONE, false), 161 HOWTO(R_390_TLS_DTPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield, 162 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", false, 0, MINUS_ONE, false), 163 HOWTO(R_390_TLS_TPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield, 164 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", false, 0, MINUS_ONE, false), 165 HOWTO(R_390_20, 0, 4, 20, false, 8, complain_overflow_dont, 166 s390_elf_ldisp_reloc, "R_390_20", false, 0,0x0fffff00, false), 167 HOWTO(R_390_GOT20, 0, 4, 20, false, 8, complain_overflow_dont, 168 s390_elf_ldisp_reloc, "R_390_GOT20", false, 0,0x0fffff00, false), 169 HOWTO(R_390_GOTPLT20, 0, 4, 20, false, 8, complain_overflow_dont, 170 s390_elf_ldisp_reloc, "R_390_GOTPLT20", false, 0,0x0fffff00, false), 171 HOWTO(R_390_TLS_GOTIE20, 0, 4, 20, false, 8, complain_overflow_dont, 172 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", false, 0,0x0fffff00, false), 173 HOWTO(R_390_IRELATIVE, 0, 8, 64, false, 0, complain_overflow_bitfield, 174 bfd_elf_generic_reloc, "R_390_IRELATIVE", false, 0, MINUS_ONE, false), 175 HOWTO(R_390_PC12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield, 176 bfd_elf_generic_reloc, "R_390_PC12DBL", false, 0,0x00000fff, true), 177 HOWTO(R_390_PLT12DBL, 1, 2, 12, true, 0, complain_overflow_bitfield, 178 bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true), 179 HOWTO(R_390_PC24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield, 180 bfd_elf_generic_reloc, "R_390_PC24DBL", false, 0,0x00ffffff, true), 181 HOWTO(R_390_PLT24DBL, 1, 4, 24, true, 0, complain_overflow_bitfield, 182 bfd_elf_generic_reloc, "R_390_PLT24DBL", false, 0,0x00ffffff, true), 183 }; 184 185 /* GNU extension to record C++ vtable hierarchy. */ 186 static reloc_howto_type elf64_s390_vtinherit_howto = 187 HOWTO (R_390_GNU_VTINHERIT, 0,8,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false); 188 static reloc_howto_type elf64_s390_vtentry_howto = 189 HOWTO (R_390_GNU_VTENTRY, 0,8,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false); 190 191 static reloc_howto_type * 192 elf_s390_reloc_type_lookup (bfd *abfd, 193 bfd_reloc_code_real_type code) 194 { 195 switch (code) 196 { 197 case BFD_RELOC_NONE: 198 return &elf_howto_table[(int) R_390_NONE]; 199 case BFD_RELOC_8: 200 return &elf_howto_table[(int) R_390_8]; 201 case BFD_RELOC_390_12: 202 return &elf_howto_table[(int) R_390_12]; 203 case BFD_RELOC_16: 204 return &elf_howto_table[(int) R_390_16]; 205 case BFD_RELOC_32: 206 return &elf_howto_table[(int) R_390_32]; 207 case BFD_RELOC_CTOR: 208 return &elf_howto_table[(int) R_390_32]; 209 case BFD_RELOC_32_PCREL: 210 return &elf_howto_table[(int) R_390_PC32]; 211 case BFD_RELOC_390_GOT12: 212 return &elf_howto_table[(int) R_390_GOT12]; 213 case BFD_RELOC_32_GOT_PCREL: 214 return &elf_howto_table[(int) R_390_GOT32]; 215 case BFD_RELOC_390_PLT32: 216 return &elf_howto_table[(int) R_390_PLT32]; 217 case BFD_RELOC_390_COPY: 218 return &elf_howto_table[(int) R_390_COPY]; 219 case BFD_RELOC_390_GLOB_DAT: 220 return &elf_howto_table[(int) R_390_GLOB_DAT]; 221 case BFD_RELOC_390_JMP_SLOT: 222 return &elf_howto_table[(int) R_390_JMP_SLOT]; 223 case BFD_RELOC_390_RELATIVE: 224 return &elf_howto_table[(int) R_390_RELATIVE]; 225 case BFD_RELOC_32_GOTOFF: 226 return &elf_howto_table[(int) R_390_GOTOFF32]; 227 case BFD_RELOC_390_GOTPC: 228 return &elf_howto_table[(int) R_390_GOTPC]; 229 case BFD_RELOC_390_GOT16: 230 return &elf_howto_table[(int) R_390_GOT16]; 231 case BFD_RELOC_16_PCREL: 232 return &elf_howto_table[(int) R_390_PC16]; 233 case BFD_RELOC_390_PC12DBL: 234 return &elf_howto_table[(int) R_390_PC12DBL]; 235 case BFD_RELOC_390_PLT12DBL: 236 return &elf_howto_table[(int) R_390_PLT12DBL]; 237 case BFD_RELOC_390_PC16DBL: 238 return &elf_howto_table[(int) R_390_PC16DBL]; 239 case BFD_RELOC_390_PLT16DBL: 240 return &elf_howto_table[(int) R_390_PLT16DBL]; 241 case BFD_RELOC_390_PC24DBL: 242 return &elf_howto_table[(int) R_390_PC24DBL]; 243 case BFD_RELOC_390_PLT24DBL: 244 return &elf_howto_table[(int) R_390_PLT24DBL]; 245 case BFD_RELOC_390_PC32DBL: 246 return &elf_howto_table[(int) R_390_PC32DBL]; 247 case BFD_RELOC_390_PLT32DBL: 248 return &elf_howto_table[(int) R_390_PLT32DBL]; 249 case BFD_RELOC_390_GOTPCDBL: 250 return &elf_howto_table[(int) R_390_GOTPCDBL]; 251 case BFD_RELOC_64: 252 return &elf_howto_table[(int) R_390_64]; 253 case BFD_RELOC_64_PCREL: 254 return &elf_howto_table[(int) R_390_PC64]; 255 case BFD_RELOC_390_GOT64: 256 return &elf_howto_table[(int) R_390_GOT64]; 257 case BFD_RELOC_390_PLT64: 258 return &elf_howto_table[(int) R_390_PLT64]; 259 case BFD_RELOC_390_GOTENT: 260 return &elf_howto_table[(int) R_390_GOTENT]; 261 case BFD_RELOC_16_GOTOFF: 262 return &elf_howto_table[(int) R_390_GOTOFF16]; 263 case BFD_RELOC_390_GOTOFF64: 264 return &elf_howto_table[(int) R_390_GOTOFF64]; 265 case BFD_RELOC_390_GOTPLT12: 266 return &elf_howto_table[(int) R_390_GOTPLT12]; 267 case BFD_RELOC_390_GOTPLT16: 268 return &elf_howto_table[(int) R_390_GOTPLT16]; 269 case BFD_RELOC_390_GOTPLT32: 270 return &elf_howto_table[(int) R_390_GOTPLT32]; 271 case BFD_RELOC_390_GOTPLT64: 272 return &elf_howto_table[(int) R_390_GOTPLT64]; 273 case BFD_RELOC_390_GOTPLTENT: 274 return &elf_howto_table[(int) R_390_GOTPLTENT]; 275 case BFD_RELOC_390_PLTOFF16: 276 return &elf_howto_table[(int) R_390_PLTOFF16]; 277 case BFD_RELOC_390_PLTOFF32: 278 return &elf_howto_table[(int) R_390_PLTOFF32]; 279 case BFD_RELOC_390_PLTOFF64: 280 return &elf_howto_table[(int) R_390_PLTOFF64]; 281 case BFD_RELOC_390_TLS_LOAD: 282 return &elf_howto_table[(int) R_390_TLS_LOAD]; 283 case BFD_RELOC_390_TLS_GDCALL: 284 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 285 case BFD_RELOC_390_TLS_LDCALL: 286 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 287 case BFD_RELOC_390_TLS_GD64: 288 return &elf_howto_table[(int) R_390_TLS_GD64]; 289 case BFD_RELOC_390_TLS_GOTIE12: 290 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 291 case BFD_RELOC_390_TLS_GOTIE64: 292 return &elf_howto_table[(int) R_390_TLS_GOTIE64]; 293 case BFD_RELOC_390_TLS_LDM64: 294 return &elf_howto_table[(int) R_390_TLS_LDM64]; 295 case BFD_RELOC_390_TLS_IE64: 296 return &elf_howto_table[(int) R_390_TLS_IE64]; 297 case BFD_RELOC_390_TLS_IEENT: 298 return &elf_howto_table[(int) R_390_TLS_IEENT]; 299 case BFD_RELOC_390_TLS_LE64: 300 return &elf_howto_table[(int) R_390_TLS_LE64]; 301 case BFD_RELOC_390_TLS_LDO64: 302 return &elf_howto_table[(int) R_390_TLS_LDO64]; 303 case BFD_RELOC_390_TLS_DTPMOD: 304 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 305 case BFD_RELOC_390_TLS_DTPOFF: 306 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 307 case BFD_RELOC_390_TLS_TPOFF: 308 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 309 case BFD_RELOC_390_20: 310 return &elf_howto_table[(int) R_390_20]; 311 case BFD_RELOC_390_GOT20: 312 return &elf_howto_table[(int) R_390_GOT20]; 313 case BFD_RELOC_390_GOTPLT20: 314 return &elf_howto_table[(int) R_390_GOTPLT20]; 315 case BFD_RELOC_390_TLS_GOTIE20: 316 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 317 case BFD_RELOC_390_IRELATIVE: 318 return &elf_howto_table[(int) R_390_IRELATIVE]; 319 case BFD_RELOC_VTABLE_INHERIT: 320 return &elf64_s390_vtinherit_howto; 321 case BFD_RELOC_VTABLE_ENTRY: 322 return &elf64_s390_vtentry_howto; 323 default: 324 break; 325 } 326 327 /* xgettext:c-format */ 328 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd, (int) code); 329 bfd_set_error (bfd_error_bad_value); 330 return NULL; 331 } 332 333 static reloc_howto_type * 334 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 335 const char *r_name) 336 { 337 unsigned int i; 338 339 for (i = 0; 340 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); 341 i++) 342 if (elf_howto_table[i].name != NULL 343 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 344 return &elf_howto_table[i]; 345 346 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0) 347 return &elf64_s390_vtinherit_howto; 348 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0) 349 return &elf64_s390_vtentry_howto; 350 351 return NULL; 352 } 353 354 /* We need to use ELF64_R_TYPE so we have our own copy of this function, 355 and elf64-s390.c has its own copy. */ 356 357 static bool 358 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 359 arelent *cache_ptr, 360 Elf_Internal_Rela *dst) 361 { 362 unsigned int r_type = ELF64_R_TYPE(dst->r_info); 363 364 switch (r_type) 365 { 366 case R_390_GNU_VTINHERIT: 367 cache_ptr->howto = &elf64_s390_vtinherit_howto; 368 break; 369 370 case R_390_GNU_VTENTRY: 371 cache_ptr->howto = &elf64_s390_vtentry_howto; 372 break; 373 374 default: 375 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 376 { 377 /* xgettext:c-format */ 378 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 379 abfd, r_type); 380 bfd_set_error (bfd_error_bad_value); 381 return false; 382 } 383 cache_ptr->howto = &elf_howto_table[r_type]; 384 } 385 return true; 386 } 387 388 /* A relocation function which doesn't do anything. */ 389 static bfd_reloc_status_type 390 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED, 391 arelent *reloc_entry, 392 asymbol *symbol ATTRIBUTE_UNUSED, 393 void * data ATTRIBUTE_UNUSED, 394 asection *input_section, 395 bfd *output_bfd, 396 char **error_message ATTRIBUTE_UNUSED) 397 { 398 if (output_bfd) 399 reloc_entry->address += input_section->output_offset; 400 return bfd_reloc_ok; 401 } 402 403 /* Handle the large displacement relocs. */ 404 static bfd_reloc_status_type 405 s390_elf_ldisp_reloc (bfd *abfd, 406 arelent *reloc_entry, 407 asymbol *symbol, 408 void * data, 409 asection *input_section, 410 bfd *output_bfd, 411 char **error_message ATTRIBUTE_UNUSED) 412 { 413 reloc_howto_type *howto = reloc_entry->howto; 414 bfd_vma relocation; 415 bfd_vma insn; 416 417 if (output_bfd != (bfd *) NULL 418 && (symbol->flags & BSF_SECTION_SYM) == 0 419 && (! howto->partial_inplace 420 || reloc_entry->addend == 0)) 421 { 422 reloc_entry->address += input_section->output_offset; 423 return bfd_reloc_ok; 424 } 425 if (output_bfd != NULL) 426 return bfd_reloc_continue; 427 428 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 429 return bfd_reloc_outofrange; 430 431 relocation = (symbol->value 432 + symbol->section->output_section->vma 433 + symbol->section->output_offset); 434 relocation += reloc_entry->addend; 435 if (howto->pc_relative) 436 { 437 relocation -= (input_section->output_section->vma 438 + input_section->output_offset); 439 relocation -= reloc_entry->address; 440 } 441 442 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 443 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 444 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 445 446 if ((bfd_signed_vma) relocation < - 0x80000 447 || (bfd_signed_vma) relocation > 0x7ffff) 448 return bfd_reloc_overflow; 449 else 450 return bfd_reloc_ok; 451 } 452 453 static bool 454 elf_s390_is_local_label_name (bfd *abfd, const char *name) 455 { 456 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 457 return true; 458 459 return _bfd_elf_is_local_label_name (abfd, name); 460 } 461 462 /* Functions for the 390 ELF linker. */ 463 464 /* The name of the dynamic interpreter. This is put in the .interp 465 section. */ 466 467 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" 468 469 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 470 copying dynamic variables from a shared lib into an app's dynbss 471 section, and instead use a dynamic relocation to point into the 472 shared lib. */ 473 #define ELIMINATE_COPY_RELOCS 1 474 475 /* The size in bytes of the first entry in the procedure linkage table. */ 476 #define PLT_FIRST_ENTRY_SIZE 32 477 /* The size in bytes of an entry in the procedure linkage table. */ 478 #define PLT_ENTRY_SIZE 32 479 480 #define GOT_ENTRY_SIZE 8 481 482 #define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela) 483 484 /* The first three entries in a global offset table are reserved, 485 and the initial contents are unimportant (we zero them out). 486 Subsequent entries look like this. See the SVR4 ABI 386 487 supplement to see how this works. */ 488 489 /* For the s390, simple addr offset can only be 0 - 4096. 490 To use the full 16777216 TB address space, several instructions 491 are needed to load an address in a register and execute 492 a branch( or just saving the address) 493 494 Furthermore, only r 0 and 1 are free to use!!! */ 495 496 /* The first 3 words in the GOT are then reserved. 497 Word 0 is the address of the dynamic table. 498 Word 1 is a pointer to a structure describing the object 499 Word 2 is used to point to the loader entry address. 500 501 The code for PLT entries looks like this: 502 503 The GOT holds the address in the PLT to be executed. 504 The loader then gets: 505 48(15) = Pointer to the structure describing the object. 506 56(15) = Offset in symbol table 507 The loader must then find the module where the function is 508 and insert the address in the GOT. 509 510 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 511 LG 1,0(1) # 6 bytes Load address from GOT in r1 512 BCR 15,1 # 2 bytes Jump to address 513 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 514 LGF 1,12(1) # 6 bytes Load rela.plt offset into r1 515 BRCL 15,-x # 6 bytes Jump to first PLT entry 516 .long ? # 4 bytes offset into .rela.plt 517 518 Total = 32 bytes per PLT entry 519 Fixup at offset 2: relative address to GOT entry 520 Fixup at offset 22: relative branch to PLT0 521 Fixup at offset 28: 32 bit offset into .rela.plt 522 523 A 32 bit offset into the symbol table is enough. It allows for 524 .rela.plt sections up to a size of 2 gigabyte. A single dynamic 525 object (the main program, any shared library) is limited to 4GB in 526 size. Having a .rela.plt of 2GB would already make the .plt 527 section bigger than 8GB. */ 528 529 static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] = 530 { 531 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */ 532 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, /* lg %r1,0(%r1) */ 533 0x07, 0xf1, /* br %r1 */ 534 0x0d, 0x10, /* basr %r1,%r0 */ 535 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, /* lgf %r1,12(%r1) */ 536 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, /* jg first plt */ 537 0x00, 0x00, 0x00, 0x00 /* .long 0x00000000 */ 538 }; 539 540 /* The first PLT entry pushes the offset into the symbol table 541 from R1 onto the stack at 56(15) and the loader object info 542 at 48(15), loads the loader address in R1 and jumps to it. */ 543 544 /* The first entry in the PLT: 545 546 PLT0: 547 STG 1,56(15) # r1 contains the offset into the symbol table 548 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table 549 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack 550 LG 1,16(1) # get entry address of loader 551 BCR 15,1 # jump to loader 552 553 Fixup at offset 8: relative address to start of GOT. */ 554 555 static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] = 556 { 557 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, /* stg %r1,56(%r15) */ 558 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */ 559 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, /* mvc 48(8,%r15),8(%r1) */ 560 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, /* lg %r1,16(%r1) */ 561 0x07, 0xf1, /* br %r1 */ 562 0x07, 0x00, /* nopr %r0 */ 563 0x07, 0x00, /* nopr %r0 */ 564 0x07, 0x00 /* nopr %r0 */ 565 }; 566 567 568 /* s390 ELF linker hash entry. */ 569 570 struct elf_s390_link_hash_entry 571 { 572 struct elf_link_hash_entry elf; 573 574 /* Number of GOTPLT references for a function. */ 575 bfd_signed_vma gotplt_refcount; 576 577 #define GOT_UNKNOWN 0 578 #define GOT_NORMAL 1 579 #define GOT_TLS_GD 2 580 #define GOT_TLS_IE 3 581 #define GOT_TLS_IE_NLT 3 582 unsigned char tls_type; 583 584 /* For pointer equality reasons we might need to change the symbol 585 type from STT_GNU_IFUNC to STT_FUNC together with its value and 586 section entry. So after alloc_dynrelocs only these values should 587 be used. In order to check whether a symbol is IFUNC use 588 s390_is_ifunc_symbol_p. */ 589 bfd_vma ifunc_resolver_address; 590 asection *ifunc_resolver_section; 591 }; 592 593 #define elf_s390_hash_entry(ent) \ 594 ((struct elf_s390_link_hash_entry *)(ent)) 595 596 /* This structure represents an entry in the local PLT list needed for 597 local IFUNC symbols. */ 598 struct plt_entry 599 { 600 /* The section of the local symbol. 601 Set in relocate_section and used in finish_dynamic_sections. */ 602 asection *sec; 603 604 union 605 { 606 bfd_signed_vma refcount; 607 bfd_vma offset; 608 } plt; 609 }; 610 611 /* NOTE: Keep this structure in sync with 612 the one declared in elf32-s390.c. */ 613 struct elf_s390_obj_tdata 614 { 615 struct elf_obj_tdata root; 616 617 /* A local PLT is needed for ifunc symbols. */ 618 struct plt_entry *local_plt; 619 620 /* TLS type for each local got entry. */ 621 char *local_got_tls_type; 622 }; 623 624 #define elf_s390_tdata(abfd) \ 625 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 626 627 #define elf_s390_local_plt(abfd) \ 628 (elf_s390_tdata (abfd)->local_plt) 629 630 #define elf_s390_local_got_tls_type(abfd) \ 631 (elf_s390_tdata (abfd)->local_got_tls_type) 632 633 #define is_s390_elf(bfd) \ 634 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 635 && elf_tdata (bfd) != NULL \ 636 && elf_object_id (bfd) == S390_ELF_DATA) 637 638 static bool 639 elf_s390_mkobject (bfd *abfd) 640 { 641 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata), 642 S390_ELF_DATA); 643 } 644 645 static bool 646 elf_s390_object_p (bfd *abfd) 647 { 648 /* Set the right machine number for an s390 elf32 file. */ 649 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); 650 } 651 652 /* s390 ELF linker hash table. */ 653 654 struct elf_s390_link_hash_table 655 { 656 struct elf_link_hash_table elf; 657 658 /* Short-cuts to get to dynamic linker sections. */ 659 asection *irelifunc; 660 661 union { 662 bfd_signed_vma refcount; 663 bfd_vma offset; 664 } tls_ldm_got; 665 666 /* Options passed from the linker. */ 667 struct s390_elf_params *params; 668 }; 669 670 /* Get the s390 ELF linker hash table from a link_info structure. */ 671 672 #define elf_s390_hash_table(p) \ 673 ((is_elf_hash_table ((p)->hash) \ 674 && elf_hash_table_id (elf_hash_table (p)) == S390_ELF_DATA) \ 675 ? (struct elf_s390_link_hash_table *) (p)->hash : NULL) 676 677 #define ELF64 1 678 #include "elf-s390-common.c" 679 680 /* Create an entry in an s390 ELF linker hash table. */ 681 682 static struct bfd_hash_entry * 683 link_hash_newfunc (struct bfd_hash_entry *entry, 684 struct bfd_hash_table *table, 685 const char *string) 686 { 687 /* Allocate the structure if it has not already been allocated by a 688 subclass. */ 689 if (entry == NULL) 690 { 691 entry = bfd_hash_allocate (table, 692 sizeof (struct elf_s390_link_hash_entry)); 693 if (entry == NULL) 694 return entry; 695 } 696 697 /* Call the allocation method of the superclass. */ 698 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 699 if (entry != NULL) 700 { 701 struct elf_s390_link_hash_entry *eh; 702 703 eh = (struct elf_s390_link_hash_entry *) entry; 704 eh->gotplt_refcount = 0; 705 eh->tls_type = GOT_UNKNOWN; 706 eh->ifunc_resolver_address = 0; 707 eh->ifunc_resolver_section = NULL; 708 } 709 710 return entry; 711 } 712 713 /* Create an s390 ELF linker hash table. */ 714 715 static struct bfd_link_hash_table * 716 elf_s390_link_hash_table_create (bfd *abfd) 717 { 718 struct elf_s390_link_hash_table *ret; 719 size_t amt = sizeof (struct elf_s390_link_hash_table); 720 721 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt); 722 if (ret == NULL) 723 return NULL; 724 725 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 726 sizeof (struct elf_s390_link_hash_entry), 727 S390_ELF_DATA)) 728 { 729 free (ret); 730 return NULL; 731 } 732 733 return &ret->elf.root; 734 } 735 736 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 737 738 static void 739 elf_s390_copy_indirect_symbol (struct bfd_link_info *info, 740 struct elf_link_hash_entry *dir, 741 struct elf_link_hash_entry *ind) 742 { 743 struct elf_s390_link_hash_entry *edir, *eind; 744 745 edir = (struct elf_s390_link_hash_entry *) dir; 746 eind = (struct elf_s390_link_hash_entry *) ind; 747 748 if (ind->root.type == bfd_link_hash_indirect 749 && dir->got.refcount <= 0) 750 { 751 edir->tls_type = eind->tls_type; 752 eind->tls_type = GOT_UNKNOWN; 753 } 754 755 if (ELIMINATE_COPY_RELOCS 756 && ind->root.type != bfd_link_hash_indirect 757 && dir->dynamic_adjusted) 758 { 759 /* If called to transfer flags for a weakdef during processing 760 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 761 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 762 if (dir->versioned != versioned_hidden) 763 dir->ref_dynamic |= ind->ref_dynamic; 764 dir->ref_regular |= ind->ref_regular; 765 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 766 dir->needs_plt |= ind->needs_plt; 767 } 768 else 769 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 770 } 771 772 static int 773 elf_s390_tls_transition (struct bfd_link_info *info, 774 int r_type, 775 int is_local) 776 { 777 if (bfd_link_dll (info)) 778 return r_type; 779 780 switch (r_type) 781 { 782 case R_390_TLS_GD64: 783 case R_390_TLS_IE64: 784 if (is_local) 785 return R_390_TLS_LE64; 786 return R_390_TLS_IE64; 787 case R_390_TLS_GOTIE64: 788 if (is_local) 789 return R_390_TLS_LE64; 790 return R_390_TLS_GOTIE64; 791 case R_390_TLS_LDM64: 792 return R_390_TLS_LE64; 793 } 794 795 return r_type; 796 } 797 798 /* Look through the relocs for a section during the first phase, and 799 allocate space in the global offset table or procedure linkage 800 table. */ 801 802 static bool 803 elf_s390_check_relocs (bfd *abfd, 804 struct bfd_link_info *info, 805 asection *sec, 806 const Elf_Internal_Rela *relocs) 807 { 808 struct elf_s390_link_hash_table *htab; 809 Elf_Internal_Shdr *symtab_hdr; 810 struct elf_link_hash_entry **sym_hashes; 811 const Elf_Internal_Rela *rel; 812 const Elf_Internal_Rela *rel_end; 813 asection *sreloc; 814 bfd_signed_vma *local_got_refcounts; 815 int tls_type, old_tls_type; 816 817 if (bfd_link_relocatable (info)) 818 return true; 819 820 BFD_ASSERT (is_s390_elf (abfd)); 821 822 htab = elf_s390_hash_table (info); 823 if (htab == NULL) 824 return false; 825 826 symtab_hdr = &elf_symtab_hdr (abfd); 827 sym_hashes = elf_sym_hashes (abfd); 828 local_got_refcounts = elf_local_got_refcounts (abfd); 829 830 sreloc = NULL; 831 832 rel_end = relocs + sec->reloc_count; 833 for (rel = relocs; rel < rel_end; rel++) 834 { 835 unsigned int r_type; 836 unsigned int r_symndx; 837 struct elf_link_hash_entry *h; 838 Elf_Internal_Sym *isym; 839 840 r_symndx = ELF64_R_SYM (rel->r_info); 841 842 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 843 { 844 /* xgettext:c-format */ 845 _bfd_error_handler (_("%pB: bad symbol index: %d"), 846 abfd, r_symndx); 847 return false; 848 } 849 850 if (r_symndx < symtab_hdr->sh_info) 851 { 852 /* A local symbol. */ 853 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 854 abfd, r_symndx); 855 if (isym == NULL) 856 return false; 857 858 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 859 { 860 struct plt_entry *plt; 861 862 if (htab->elf.dynobj == NULL) 863 htab->elf.dynobj = abfd; 864 865 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 866 return false; 867 868 if (local_got_refcounts == NULL) 869 { 870 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 871 return false; 872 local_got_refcounts = elf_local_got_refcounts (abfd); 873 } 874 plt = elf_s390_local_plt (abfd); 875 plt[r_symndx].plt.refcount++; 876 } 877 h = NULL; 878 } 879 else 880 { 881 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 882 while (h->root.type == bfd_link_hash_indirect 883 || h->root.type == bfd_link_hash_warning) 884 h = (struct elf_link_hash_entry *) h->root.u.i.link; 885 } 886 887 /* Create got section and local_got_refcounts array if they 888 are needed. */ 889 r_type = elf_s390_tls_transition (info, 890 ELF64_R_TYPE (rel->r_info), 891 h == NULL); 892 switch (r_type) 893 { 894 case R_390_GOT12: 895 case R_390_GOT16: 896 case R_390_GOT20: 897 case R_390_GOT32: 898 case R_390_GOT64: 899 case R_390_GOTENT: 900 case R_390_GOTPLT12: 901 case R_390_GOTPLT16: 902 case R_390_GOTPLT20: 903 case R_390_GOTPLT32: 904 case R_390_GOTPLT64: 905 case R_390_GOTPLTENT: 906 case R_390_TLS_GD64: 907 case R_390_TLS_GOTIE12: 908 case R_390_TLS_GOTIE20: 909 case R_390_TLS_GOTIE64: 910 case R_390_TLS_IEENT: 911 case R_390_TLS_IE64: 912 case R_390_TLS_LDM64: 913 if (h == NULL 914 && local_got_refcounts == NULL) 915 { 916 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 917 return false; 918 local_got_refcounts = elf_local_got_refcounts (abfd); 919 } 920 921 /* Fall through. */ 922 case R_390_GOTOFF16: 923 case R_390_GOTOFF32: 924 case R_390_GOTOFF64: 925 case R_390_GOTPC: 926 case R_390_GOTPCDBL: 927 if (htab->elf.sgot == NULL) 928 { 929 if (htab->elf.dynobj == NULL) 930 htab->elf.dynobj = abfd; 931 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) 932 return false; 933 } 934 } 935 936 if (h != NULL) 937 { 938 if (htab->elf.dynobj == NULL) 939 htab->elf.dynobj = abfd; 940 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 941 return false; 942 943 /* Make sure an IFUNC symbol defined in a non-shared object 944 always gets a PLT slot. */ 945 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 946 { 947 /* The symbol is called by the dynamic loader in order 948 to resolve the relocation. So it is in fact also 949 referenced. */ 950 h->ref_regular = 1; 951 h->needs_plt = 1; 952 } 953 } 954 955 switch (r_type) 956 { 957 case R_390_GOTPC: 958 case R_390_GOTPCDBL: 959 /* These relocs do not need a GOT slot. They just load the 960 GOT pointer itself or address something else relative to 961 the GOT. Since the GOT pointer has been set up above we 962 are done. */ 963 break; 964 case R_390_GOTOFF16: 965 case R_390_GOTOFF32: 966 case R_390_GOTOFF64: 967 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular) 968 break; 969 /* Fall through. */ 970 971 case R_390_PLT12DBL: 972 case R_390_PLT16DBL: 973 case R_390_PLT24DBL: 974 case R_390_PLT32: 975 case R_390_PLT32DBL: 976 case R_390_PLT64: 977 case R_390_PLTOFF16: 978 case R_390_PLTOFF32: 979 case R_390_PLTOFF64: 980 /* This symbol requires a procedure linkage table entry. We 981 actually build the entry in adjust_dynamic_symbol, 982 because this might be a case of linking PIC code which is 983 never referenced by a dynamic object, in which case we 984 don't need to generate a procedure linkage table entry 985 after all. */ 986 987 /* If this is a local symbol, we resolve it directly without 988 creating a procedure linkage table entry. */ 989 if (h != NULL) 990 { 991 h->needs_plt = 1; 992 h->plt.refcount += 1; 993 } 994 break; 995 996 case R_390_GOTPLT12: 997 case R_390_GOTPLT16: 998 case R_390_GOTPLT20: 999 case R_390_GOTPLT32: 1000 case R_390_GOTPLT64: 1001 case R_390_GOTPLTENT: 1002 /* This symbol requires either a procedure linkage table entry 1003 or an entry in the local got. We actually build the entry 1004 in adjust_dynamic_symbol because whether this is really a 1005 global reference can change and with it the fact if we have 1006 to create a plt entry or a local got entry. To be able to 1007 make a once global symbol a local one we have to keep track 1008 of the number of gotplt references that exist for this 1009 symbol. */ 1010 if (h != NULL) 1011 { 1012 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1013 h->needs_plt = 1; 1014 h->plt.refcount += 1; 1015 } 1016 else 1017 local_got_refcounts[r_symndx] += 1; 1018 break; 1019 1020 case R_390_TLS_LDM64: 1021 htab->tls_ldm_got.refcount += 1; 1022 break; 1023 1024 case R_390_TLS_IE64: 1025 case R_390_TLS_GOTIE12: 1026 case R_390_TLS_GOTIE20: 1027 case R_390_TLS_GOTIE64: 1028 case R_390_TLS_IEENT: 1029 if (bfd_link_dll (info)) 1030 info->flags |= DF_STATIC_TLS; 1031 /* Fall through */ 1032 1033 case R_390_GOT12: 1034 case R_390_GOT16: 1035 case R_390_GOT20: 1036 case R_390_GOT32: 1037 case R_390_GOT64: 1038 case R_390_GOTENT: 1039 case R_390_TLS_GD64: 1040 /* This symbol requires a global offset table entry. */ 1041 switch (r_type) 1042 { 1043 default: 1044 case R_390_GOT12: 1045 case R_390_GOT16: 1046 case R_390_GOT20: 1047 case R_390_GOT32: 1048 case R_390_GOTENT: 1049 tls_type = GOT_NORMAL; 1050 break; 1051 case R_390_TLS_GD64: 1052 tls_type = GOT_TLS_GD; 1053 break; 1054 case R_390_TLS_IE64: 1055 case R_390_TLS_GOTIE64: 1056 tls_type = GOT_TLS_IE; 1057 break; 1058 case R_390_TLS_GOTIE12: 1059 case R_390_TLS_GOTIE20: 1060 case R_390_TLS_IEENT: 1061 tls_type = GOT_TLS_IE_NLT; 1062 break; 1063 } 1064 1065 if (h != NULL) 1066 { 1067 h->got.refcount += 1; 1068 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1069 } 1070 else 1071 { 1072 local_got_refcounts[r_symndx] += 1; 1073 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1074 } 1075 /* If a TLS symbol is accessed using IE at least once, 1076 there is no point to use dynamic model for it. */ 1077 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1078 { 1079 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1080 { 1081 _bfd_error_handler 1082 /* xgettext:c-format */ 1083 (_("%pB: `%s' accessed both as normal and thread local symbol"), 1084 abfd, h->root.root.string); 1085 return false; 1086 } 1087 if (old_tls_type > tls_type) 1088 tls_type = old_tls_type; 1089 } 1090 1091 if (old_tls_type != tls_type) 1092 { 1093 if (h != NULL) 1094 elf_s390_hash_entry (h)->tls_type = tls_type; 1095 else 1096 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1097 } 1098 1099 if (r_type != R_390_TLS_IE64) 1100 break; 1101 /* Fall through */ 1102 1103 case R_390_TLS_LE64: 1104 /* For static linking and executables this reloc will be 1105 calculated at linktime otherwise a TLS_TPOFF runtime 1106 reloc will be generated. */ 1107 if (r_type == R_390_TLS_LE64 && bfd_link_pie (info)) 1108 break; 1109 1110 if (!bfd_link_dll (info)) 1111 break; 1112 info->flags |= DF_STATIC_TLS; 1113 /* Fall through */ 1114 1115 case R_390_8: 1116 case R_390_16: 1117 case R_390_32: 1118 case R_390_64: 1119 case R_390_PC12DBL: 1120 case R_390_PC16: 1121 case R_390_PC16DBL: 1122 case R_390_PC24DBL: 1123 case R_390_PC32: 1124 case R_390_PC32DBL: 1125 case R_390_PC64: 1126 if (h != NULL && bfd_link_executable (info)) 1127 { 1128 /* If this reloc is in a read-only section, we might 1129 need a copy reloc. We can't check reliably at this 1130 stage whether the section is read-only, as input 1131 sections have not yet been mapped to output sections. 1132 Tentatively set the flag for now, and correct in 1133 adjust_dynamic_symbol. */ 1134 h->non_got_ref = 1; 1135 1136 if (!bfd_link_pic (info)) 1137 { 1138 /* We may need a .plt entry if the function this reloc 1139 refers to is in a shared lib. */ 1140 h->plt.refcount += 1; 1141 } 1142 } 1143 1144 /* If we are creating a shared library, and this is a reloc 1145 against a global symbol, or a non PC relative reloc 1146 against a local symbol, then we need to copy the reloc 1147 into the shared library. However, if we are linking with 1148 -Bsymbolic, we do not need to copy a reloc against a 1149 global symbol which is defined in an object we are 1150 including in the link (i.e., DEF_REGULAR is set). At 1151 this point we have not seen all the input files, so it is 1152 possible that DEF_REGULAR is not set now but will be set 1153 later (it is never cleared). In case of a weak definition, 1154 DEF_REGULAR may be cleared later by a strong definition in 1155 a shared library. We account for that possibility below by 1156 storing information in the relocs_copied field of the hash 1157 table entry. A similar situation occurs when creating 1158 shared libraries and symbol visibility changes render the 1159 symbol local. 1160 1161 If on the other hand, we are creating an executable, we 1162 may need to keep relocations for symbols satisfied by a 1163 dynamic library if we manage to avoid copy relocs for the 1164 symbol. */ 1165 if ((bfd_link_pic (info) 1166 && (sec->flags & SEC_ALLOC) != 0 1167 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 1168 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL 1169 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL 1170 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL 1171 && ELF64_R_TYPE (rel->r_info) != R_390_PC32 1172 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL 1173 && ELF64_R_TYPE (rel->r_info) != R_390_PC64) 1174 || (h != NULL 1175 && (! SYMBOLIC_BIND (info, h) 1176 || h->root.type == bfd_link_hash_defweak 1177 || !h->def_regular)))) 1178 || (ELIMINATE_COPY_RELOCS 1179 && !bfd_link_pic (info) 1180 && (sec->flags & SEC_ALLOC) != 0 1181 && h != NULL 1182 && (h->root.type == bfd_link_hash_defweak 1183 || !h->def_regular))) 1184 { 1185 struct elf_dyn_relocs *p; 1186 struct elf_dyn_relocs **head; 1187 1188 /* We must copy these reloc types into the output file. 1189 Create a reloc section in dynobj and make room for 1190 this reloc. */ 1191 if (sreloc == NULL) 1192 { 1193 if (htab->elf.dynobj == NULL) 1194 htab->elf.dynobj = abfd; 1195 1196 sreloc = _bfd_elf_make_dynamic_reloc_section 1197 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ true); 1198 1199 if (sreloc == NULL) 1200 return false; 1201 } 1202 1203 /* If this is a global symbol, we count the number of 1204 relocations we need for this symbol. */ 1205 if (h != NULL) 1206 { 1207 head = &h->dyn_relocs; 1208 } 1209 else 1210 { 1211 /* Track dynamic relocs needed for local syms too. 1212 We really need local syms available to do this 1213 easily. Oh well. */ 1214 asection *s; 1215 void *vpp; 1216 1217 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1218 abfd, r_symndx); 1219 if (isym == NULL) 1220 return false; 1221 1222 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1223 if (s == NULL) 1224 s = sec; 1225 1226 vpp = &elf_section_data (s)->local_dynrel; 1227 head = (struct elf_dyn_relocs **) vpp; 1228 } 1229 1230 p = *head; 1231 if (p == NULL || p->sec != sec) 1232 { 1233 size_t amt = sizeof *p; 1234 p = ((struct elf_dyn_relocs *) 1235 bfd_alloc (htab->elf.dynobj, amt)); 1236 if (p == NULL) 1237 return false; 1238 p->next = *head; 1239 *head = p; 1240 p->sec = sec; 1241 p->count = 0; 1242 p->pc_count = 0; 1243 } 1244 1245 p->count += 1; 1246 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 1247 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL 1248 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1249 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1250 || ELF64_R_TYPE (rel->r_info) == R_390_PC32 1251 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL 1252 || ELF64_R_TYPE (rel->r_info) == R_390_PC64) 1253 p->pc_count += 1; 1254 } 1255 break; 1256 1257 /* This relocation describes the C++ object vtable hierarchy. 1258 Reconstruct it for later use during GC. */ 1259 case R_390_GNU_VTINHERIT: 1260 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1261 return false; 1262 break; 1263 1264 /* This relocation describes which C++ vtable entries are actually 1265 used. Record for later use during GC. */ 1266 case R_390_GNU_VTENTRY: 1267 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1268 return false; 1269 break; 1270 1271 default: 1272 break; 1273 } 1274 } 1275 1276 return true; 1277 } 1278 1279 /* Return the section that should be marked against GC for a given 1280 relocation. */ 1281 1282 static asection * 1283 elf_s390_gc_mark_hook (asection *sec, 1284 struct bfd_link_info *info, 1285 Elf_Internal_Rela *rel, 1286 struct elf_link_hash_entry *h, 1287 Elf_Internal_Sym *sym) 1288 { 1289 if (h != NULL) 1290 switch (ELF64_R_TYPE (rel->r_info)) 1291 { 1292 case R_390_GNU_VTINHERIT: 1293 case R_390_GNU_VTENTRY: 1294 return NULL; 1295 } 1296 1297 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1298 } 1299 1300 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1301 entry but we found we will not create any. Called when we find we will 1302 not have any PLT for this symbol, by for example 1303 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1304 or elf_s390_late_size_sections if no dynamic sections will be 1305 created (we're only linking static objects). */ 1306 1307 static void 1308 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h) 1309 { 1310 if (h->elf.root.type == bfd_link_hash_warning) 1311 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1312 1313 if (h->gotplt_refcount <= 0) 1314 return; 1315 1316 /* We simply add the number of gotplt references to the number 1317 * of got references for this symbol. */ 1318 h->elf.got.refcount += h->gotplt_refcount; 1319 h->gotplt_refcount = -1; 1320 } 1321 1322 /* Adjust a symbol defined by a dynamic object and referenced by a 1323 regular object. The current definition is in some section of the 1324 dynamic object, but we're not including those sections. We have to 1325 change the definition to something the rest of the link can 1326 understand. */ 1327 1328 static bool 1329 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info, 1330 struct elf_link_hash_entry *h) 1331 { 1332 struct elf_s390_link_hash_table *htab; 1333 asection *s, *srel; 1334 1335 /* STT_GNU_IFUNC symbol must go through PLT. */ 1336 if (s390_is_ifunc_symbol_p (h)) 1337 { 1338 /* All local STT_GNU_IFUNC references must be treated as local 1339 calls via local PLT. */ 1340 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h)) 1341 { 1342 bfd_size_type pc_count = 0, count = 0; 1343 struct elf_dyn_relocs **pp; 1344 struct elf_dyn_relocs *p; 1345 1346 for (pp = &h->dyn_relocs; (p = *pp) != NULL; ) 1347 { 1348 pc_count += p->pc_count; 1349 p->count -= p->pc_count; 1350 p->pc_count = 0; 1351 count += p->count; 1352 if (p->count == 0) 1353 *pp = p->next; 1354 else 1355 pp = &p->next; 1356 } 1357 1358 if (pc_count || count) 1359 { 1360 h->needs_plt = 1; 1361 h->non_got_ref = 1; 1362 if (h->plt.refcount <= 0) 1363 h->plt.refcount = 1; 1364 else 1365 h->plt.refcount += 1; 1366 } 1367 } 1368 1369 if (h->plt.refcount <= 0) 1370 { 1371 h->plt.offset = (bfd_vma) -1; 1372 h->needs_plt = 0; 1373 } 1374 return true; 1375 } 1376 1377 /* If this is a function, put it in the procedure linkage table. We 1378 will fill in the contents of the procedure linkage table later 1379 (although we could actually do it here). */ 1380 if (h->type == STT_FUNC 1381 || h->needs_plt) 1382 { 1383 if (h->plt.refcount <= 0 1384 || SYMBOL_CALLS_LOCAL (info, h) 1385 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 1386 { 1387 /* This case can occur if we saw a PLT32 reloc in an input 1388 file, but the symbol was never referred to by a dynamic 1389 object, or if all references were garbage collected. In 1390 such a case, we don't actually need to build a procedure 1391 linkage table, and we can just do a PC32 reloc instead. */ 1392 h->plt.offset = (bfd_vma) -1; 1393 h->needs_plt = 0; 1394 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1395 } 1396 1397 return true; 1398 } 1399 else 1400 /* It's possible that we incorrectly decided a .plt reloc was 1401 needed for an R_390_PC32 reloc to a non-function sym in 1402 check_relocs. We can't decide accurately between function and 1403 non-function syms in check-relocs; Objects loaded later in 1404 the link may change h->type. So fix it now. */ 1405 h->plt.offset = (bfd_vma) -1; 1406 1407 /* If this is a weak symbol, and there is a real definition, the 1408 processor independent code will have arranged for us to see the 1409 real definition first, and we can just use the same value. */ 1410 if (h->is_weakalias) 1411 { 1412 struct elf_link_hash_entry *def = weakdef (h); 1413 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 1414 h->root.u.def.section = def->root.u.def.section; 1415 h->root.u.def.value = def->root.u.def.value; 1416 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1417 h->non_got_ref = def->non_got_ref; 1418 return true; 1419 } 1420 1421 /* This is a reference to a symbol defined by a dynamic object which 1422 is not a function. */ 1423 1424 /* If we are creating a shared library, we must presume that the 1425 only references to the symbol are via the global offset table. 1426 For such cases we need not do anything here; the relocations will 1427 be handled correctly by relocate_section. */ 1428 if (bfd_link_pic (info)) 1429 return true; 1430 1431 /* If there are no references to this symbol that do not use the 1432 GOT, we don't need to generate a copy reloc. */ 1433 if (!h->non_got_ref) 1434 return true; 1435 1436 /* If -z nocopyreloc was given, we won't generate them either. */ 1437 if (info->nocopyreloc) 1438 { 1439 h->non_got_ref = 0; 1440 return true; 1441 } 1442 1443 /* If we don't find any dynamic relocs in read-only sections, then 1444 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1445 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h)) 1446 { 1447 h->non_got_ref = 0; 1448 return true; 1449 } 1450 1451 /* We must allocate the symbol in our .dynbss section, which will 1452 become part of the .bss section of the executable. There will be 1453 an entry for this symbol in the .dynsym section. The dynamic 1454 object will contain position independent code, so all references 1455 from the dynamic object to this symbol will go through the global 1456 offset table. The dynamic linker will use the .dynsym entry to 1457 determine the address it must put in the global offset table, so 1458 both the dynamic object and the regular object will refer to the 1459 same memory location for the variable. */ 1460 1461 htab = elf_s390_hash_table (info); 1462 if (htab == NULL) 1463 return false; 1464 1465 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1466 copy the initial value out of the dynamic object and into the 1467 runtime process image. */ 1468 if ((h->root.u.def.section->flags & SEC_READONLY) != 0) 1469 { 1470 s = htab->elf.sdynrelro; 1471 srel = htab->elf.sreldynrelro; 1472 } 1473 else 1474 { 1475 s = htab->elf.sdynbss; 1476 srel = htab->elf.srelbss; 1477 } 1478 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1479 { 1480 srel->size += sizeof (Elf64_External_Rela); 1481 h->needs_copy = 1; 1482 } 1483 1484 return _bfd_elf_adjust_dynamic_copy (info, h, s); 1485 } 1486 1487 /* Allocate space in .plt, .got and associated reloc sections for 1488 dynamic relocs. */ 1489 1490 static bool 1491 allocate_dynrelocs (struct elf_link_hash_entry *h, 1492 void * inf) 1493 { 1494 struct bfd_link_info *info; 1495 struct elf_s390_link_hash_table *htab; 1496 struct elf_dyn_relocs *p; 1497 1498 if (h->root.type == bfd_link_hash_indirect) 1499 return true; 1500 1501 info = (struct bfd_link_info *) inf; 1502 htab = elf_s390_hash_table (info); 1503 if (htab == NULL) 1504 return false; 1505 1506 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 1507 here if it is defined and referenced in a non-shared object. */ 1508 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1509 return s390_elf_allocate_ifunc_dyn_relocs (info, h); 1510 else if (htab->elf.dynamic_sections_created 1511 && h->plt.refcount > 0) 1512 { 1513 /* Make sure this symbol is output as a dynamic symbol. 1514 Undefined weak syms won't yet be marked as dynamic. */ 1515 if (h->dynindx == -1 1516 && !h->forced_local) 1517 { 1518 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1519 return false; 1520 } 1521 1522 if (bfd_link_pic (info) 1523 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1524 { 1525 asection *s = htab->elf.splt; 1526 1527 /* If this is the first .plt entry, make room for the special 1528 first entry. */ 1529 if (s->size == 0) 1530 s->size += PLT_FIRST_ENTRY_SIZE; 1531 1532 h->plt.offset = s->size; 1533 1534 /* If this symbol is not defined in a regular file, and we are 1535 not generating a shared library, then set the symbol to this 1536 location in the .plt. This is required to make function 1537 pointers compare as equal between the normal executable and 1538 the shared library. */ 1539 if (! bfd_link_pic (info) 1540 && !h->def_regular) 1541 { 1542 h->root.u.def.section = s; 1543 h->root.u.def.value = h->plt.offset; 1544 } 1545 1546 /* Make room for this entry. */ 1547 s->size += PLT_ENTRY_SIZE; 1548 1549 /* We also need to make an entry in the .got.plt section. */ 1550 htab->elf.sgotplt->size += GOT_ENTRY_SIZE; 1551 1552 /* We also need to make an entry in the .rela.plt section. */ 1553 htab->elf.srelplt->size += sizeof (Elf64_External_Rela); 1554 } 1555 else 1556 { 1557 h->plt.offset = (bfd_vma) -1; 1558 h->needs_plt = 0; 1559 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1560 } 1561 } 1562 else 1563 { 1564 h->plt.offset = (bfd_vma) -1; 1565 h->needs_plt = 0; 1566 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1567 } 1568 1569 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to 1570 the binary, we can optimize a bit. IE64 and GOTIE64 get converted 1571 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT 1572 we can save the dynamic TLS relocation. */ 1573 if (h->got.refcount > 0 1574 && !bfd_link_dll (info) 1575 && h->dynindx == -1 1576 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1577 { 1578 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1579 /* For the GOTIE access without a literal pool entry the offset has 1580 to be stored somewhere. The immediate value in the instruction 1581 is not bit enough so the value is stored in the got. */ 1582 { 1583 h->got.offset = htab->elf.sgot->size; 1584 htab->elf.sgot->size += GOT_ENTRY_SIZE; 1585 } 1586 else 1587 h->got.offset = (bfd_vma) -1; 1588 } 1589 else if (h->got.refcount > 0) 1590 { 1591 asection *s; 1592 bool dyn; 1593 int tls_type = elf_s390_hash_entry(h)->tls_type; 1594 1595 /* Make sure this symbol is output as a dynamic symbol. 1596 Undefined weak syms won't yet be marked as dynamic. */ 1597 if (h->dynindx == -1 1598 && !h->forced_local) 1599 { 1600 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1601 return false; 1602 } 1603 1604 s = htab->elf.sgot; 1605 h->got.offset = s->size; 1606 s->size += GOT_ENTRY_SIZE; 1607 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */ 1608 if (tls_type == GOT_TLS_GD) 1609 s->size += GOT_ENTRY_SIZE; 1610 dyn = htab->elf.dynamic_sections_created; 1611 /* R_390_TLS_IE64 needs one dynamic relocation, 1612 R_390_TLS_GD64 needs one if local symbol and two if global. */ 1613 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1614 || tls_type >= GOT_TLS_IE) 1615 htab->elf.srelgot->size += sizeof (Elf64_External_Rela); 1616 else if (tls_type == GOT_TLS_GD) 1617 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela); 1618 else if (!UNDEFWEAK_NO_DYNAMIC_RELOC (info, h) 1619 && (bfd_link_pic (info) 1620 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1621 htab->elf.srelgot->size += sizeof (Elf64_External_Rela); 1622 } 1623 else 1624 h->got.offset = (bfd_vma) -1; 1625 1626 if (h->dyn_relocs == NULL) 1627 return true; 1628 1629 /* In the shared -Bsymbolic case, discard space allocated for 1630 dynamic pc-relative relocs against symbols which turn out to be 1631 defined in regular objects. For the normal shared case, discard 1632 space for pc-relative relocs that have become local due to symbol 1633 visibility changes. */ 1634 1635 if (bfd_link_pic (info)) 1636 { 1637 if (SYMBOL_CALLS_LOCAL (info, h)) 1638 { 1639 struct elf_dyn_relocs **pp; 1640 1641 for (pp = &h->dyn_relocs; (p = *pp) != NULL; ) 1642 { 1643 p->count -= p->pc_count; 1644 p->pc_count = 0; 1645 if (p->count == 0) 1646 *pp = p->next; 1647 else 1648 pp = &p->next; 1649 } 1650 } 1651 1652 /* Also discard relocs on undefined weak syms with non-default 1653 visibility. */ 1654 if (h->dyn_relocs != NULL 1655 && h->root.type == bfd_link_hash_undefweak) 1656 { 1657 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1658 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 1659 h->dyn_relocs = NULL; 1660 1661 /* Make sure undefined weak symbols are output as a dynamic 1662 symbol in PIEs. */ 1663 else if (h->dynindx == -1 1664 && !h->forced_local) 1665 { 1666 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1667 return false; 1668 } 1669 } 1670 } 1671 else if (ELIMINATE_COPY_RELOCS) 1672 { 1673 /* For the non-shared case, discard space for relocs against 1674 symbols which turn out to need copy relocs or are not 1675 dynamic. */ 1676 1677 if (!h->non_got_ref 1678 && ((h->def_dynamic 1679 && !h->def_regular) 1680 || (htab->elf.dynamic_sections_created 1681 && (h->root.type == bfd_link_hash_undefweak 1682 || h->root.type == bfd_link_hash_undefined)))) 1683 { 1684 /* Make sure this symbol is output as a dynamic symbol. 1685 Undefined weak syms won't yet be marked as dynamic. */ 1686 if (h->dynindx == -1 1687 && !h->forced_local) 1688 { 1689 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1690 return false; 1691 } 1692 1693 /* If that succeeded, we know we'll be keeping all the 1694 relocs. */ 1695 if (h->dynindx != -1) 1696 goto keep; 1697 } 1698 1699 h->dyn_relocs = NULL; 1700 1701 keep: ; 1702 } 1703 1704 /* Finally, allocate space. */ 1705 for (p = h->dyn_relocs; p != NULL; p = p->next) 1706 { 1707 asection *sreloc = elf_section_data (p->sec)->sreloc; 1708 sreloc->size += p->count * sizeof (Elf64_External_Rela); 1709 } 1710 1711 return true; 1712 } 1713 1714 /* Set the sizes of the dynamic sections. */ 1715 1716 static bool 1717 elf_s390_late_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1718 struct bfd_link_info *info) 1719 { 1720 struct elf_s390_link_hash_table *htab; 1721 bfd *dynobj; 1722 asection *s; 1723 bool relocs; 1724 bfd *ibfd; 1725 1726 htab = elf_s390_hash_table (info); 1727 if (htab == NULL) 1728 return false; 1729 1730 dynobj = htab->elf.dynobj; 1731 if (dynobj == NULL) 1732 return true; 1733 1734 if (htab->elf.dynamic_sections_created) 1735 { 1736 /* Set the contents of the .interp section to the interpreter. */ 1737 if (bfd_link_executable (info) && !info->nointerp) 1738 { 1739 s = bfd_get_linker_section (dynobj, ".interp"); 1740 if (s == NULL) 1741 abort (); 1742 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1743 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1744 } 1745 } 1746 1747 if (htab->elf.sgot && s390_gotplt_after_got_p (info)) 1748 { 1749 /* _bfd_elf_create_got_section adds the got header size always 1750 to .got.plt but we need it in .got if this section comes 1751 first. */ 1752 htab->elf.sgot->size += 3 * GOT_ENTRY_SIZE; 1753 htab->elf.sgotplt->size -= 3 * GOT_ENTRY_SIZE; 1754 1755 /* Make the _GLOBAL_OFFSET_TABLE_ symbol point to the .got 1756 instead of .got.plt. */ 1757 htab->elf.hgot->root.u.def.section = htab->elf.sgot; 1758 htab->elf.hgot->root.u.def.value = 0; 1759 } 1760 1761 /* Set up .got offsets for local syms, and space for local dynamic 1762 relocs. */ 1763 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 1764 { 1765 bfd_signed_vma *local_got; 1766 bfd_signed_vma *end_local_got; 1767 char *local_tls_type; 1768 bfd_size_type locsymcount; 1769 Elf_Internal_Shdr *symtab_hdr; 1770 asection *srela; 1771 struct plt_entry *local_plt; 1772 unsigned int i; 1773 1774 if (! is_s390_elf (ibfd)) 1775 continue; 1776 1777 for (s = ibfd->sections; s != NULL; s = s->next) 1778 { 1779 struct elf_dyn_relocs *p; 1780 1781 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 1782 { 1783 if (!bfd_is_abs_section (p->sec) 1784 && bfd_is_abs_section (p->sec->output_section)) 1785 { 1786 /* Input section has been discarded, either because 1787 it is a copy of a linkonce section or due to 1788 linker script /DISCARD/, so we'll be discarding 1789 the relocs too. */ 1790 } 1791 else if (p->count != 0) 1792 { 1793 srela = elf_section_data (p->sec)->sreloc; 1794 srela->size += p->count * sizeof (Elf64_External_Rela); 1795 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1796 info->flags |= DF_TEXTREL; 1797 } 1798 } 1799 } 1800 1801 local_got = elf_local_got_refcounts (ibfd); 1802 if (!local_got) 1803 continue; 1804 1805 symtab_hdr = &elf_symtab_hdr (ibfd); 1806 locsymcount = symtab_hdr->sh_info; 1807 end_local_got = local_got + locsymcount; 1808 local_tls_type = elf_s390_local_got_tls_type (ibfd); 1809 s = htab->elf.sgot; 1810 srela = htab->elf.srelgot; 1811 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 1812 { 1813 if (*local_got > 0) 1814 { 1815 *local_got = s->size; 1816 s->size += GOT_ENTRY_SIZE; 1817 if (*local_tls_type == GOT_TLS_GD) 1818 s->size += GOT_ENTRY_SIZE; 1819 if (bfd_link_pic (info)) 1820 srela->size += sizeof (Elf64_External_Rela); 1821 } 1822 else 1823 *local_got = (bfd_vma) -1; 1824 } 1825 1826 local_plt = elf_s390_local_plt (ibfd); 1827 for (i = 0; i < symtab_hdr->sh_info; i++) 1828 { 1829 if (local_plt[i].plt.refcount > 0) 1830 { 1831 local_plt[i].plt.offset = htab->elf.iplt->size; 1832 htab->elf.iplt->size += PLT_ENTRY_SIZE; 1833 htab->elf.igotplt->size += GOT_ENTRY_SIZE; 1834 htab->elf.irelplt->size += sizeof (Elf64_External_Rela); 1835 } 1836 else 1837 local_plt[i].plt.offset = (bfd_vma) -1; 1838 } 1839 } 1840 1841 if (htab->tls_ldm_got.refcount > 0) 1842 { 1843 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64 1844 relocs. */ 1845 htab->tls_ldm_got.offset = htab->elf.sgot->size; 1846 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; 1847 htab->elf.srelgot->size += sizeof (Elf64_External_Rela); 1848 } 1849 else 1850 htab->tls_ldm_got.offset = -1; 1851 1852 /* Allocate global sym .plt and .got entries, and space for global 1853 sym dynamic relocs. */ 1854 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 1855 1856 /* We now have determined the sizes of the various dynamic sections. 1857 Allocate memory for them. */ 1858 relocs = false; 1859 for (s = dynobj->sections; s != NULL; s = s->next) 1860 { 1861 if ((s->flags & SEC_LINKER_CREATED) == 0) 1862 continue; 1863 1864 if (s == htab->elf.splt 1865 || s == htab->elf.sgot 1866 || s == htab->elf.sgotplt 1867 || s == htab->elf.sdynbss 1868 || s == htab->elf.sdynrelro 1869 || s == htab->elf.iplt 1870 || s == htab->elf.igotplt 1871 || s == htab->irelifunc) 1872 { 1873 /* Strip this section if we don't need it; see the 1874 comment below. */ 1875 } 1876 else if (startswith (bfd_section_name (s), ".rela")) 1877 { 1878 if (s->size != 0 && s != htab->elf.srelplt) 1879 { 1880 relocs = true; 1881 if (s == htab->elf.irelplt) 1882 { 1883 /* In static-pie case, there are IRELATIVE-relocs in 1884 .rela.iplt (htab->irelplt), which will later be grouped 1885 to .rela.plt. On s390, the IRELATIVE relocations are 1886 always located in .rela.iplt - even for non-static case. 1887 Ensure that DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ is added 1888 to the dynamic section even if htab->srelplt->size == 0. 1889 See _bfd_elf_add_dynamic_tags in bfd/elflink.c. */ 1890 htab->elf.dt_jmprel_required = true; 1891 } 1892 } 1893 1894 /* We use the reloc_count field as a counter if we need 1895 to copy relocs into the output file. */ 1896 s->reloc_count = 0; 1897 } 1898 else 1899 { 1900 /* It's not one of our sections, so don't allocate space. */ 1901 continue; 1902 } 1903 1904 if (s->size == 0) 1905 { 1906 /* If we don't need this section, strip it from the 1907 output file. This is to handle .rela.bss and 1908 .rela.plt. We must create it in 1909 create_dynamic_sections, because it must be created 1910 before the linker maps input sections to output 1911 sections. The linker does that before 1912 adjust_dynamic_symbol is called, and it is that 1913 function which decides whether anything needs to go 1914 into these sections. */ 1915 1916 s->flags |= SEC_EXCLUDE; 1917 continue; 1918 } 1919 1920 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1921 continue; 1922 1923 /* Allocate memory for the section contents. We use bfd_zalloc 1924 here in case unused entries are not reclaimed before the 1925 section's contents are written out. This should not happen, 1926 but this way if it does, we get a R_390_NONE reloc instead 1927 of garbage. */ 1928 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1929 if (s->contents == NULL) 1930 return false; 1931 } 1932 1933 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 1934 } 1935 1936 /* Return the base VMA address which should be subtracted from real addresses 1937 when resolving @dtpoff relocation. 1938 This is PT_TLS segment p_vaddr. */ 1939 1940 static bfd_vma 1941 dtpoff_base (struct bfd_link_info *info) 1942 { 1943 /* If tls_sec is NULL, we should have signalled an error already. */ 1944 if (elf_hash_table (info)->tls_sec == NULL) 1945 return 0; 1946 return elf_hash_table (info)->tls_sec->vma; 1947 } 1948 1949 /* Return the relocation value for @tpoff relocation 1950 if STT_TLS virtual address is ADDRESS. */ 1951 1952 static bfd_vma 1953 tpoff (struct bfd_link_info *info, bfd_vma address) 1954 { 1955 struct elf_link_hash_table *htab = elf_hash_table (info); 1956 1957 /* If tls_sec is NULL, we should have signalled an error already. */ 1958 if (htab->tls_sec == NULL) 1959 return 0; 1960 return htab->tls_size + htab->tls_sec->vma - address; 1961 } 1962 1963 /* Complain if TLS instruction relocation is against an invalid 1964 instruction. */ 1965 1966 static void 1967 invalid_tls_insn (bfd *input_bfd, 1968 asection *input_section, 1969 Elf_Internal_Rela *rel) 1970 { 1971 reloc_howto_type *howto; 1972 1973 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info); 1974 _bfd_error_handler 1975 /* xgettext:c-format */ 1976 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"), 1977 input_bfd, 1978 input_section, 1979 (uint64_t) rel->r_offset, 1980 howto->name); 1981 bfd_set_error (bfd_error_bad_value); 1982 } 1983 1984 /* Relocate a 390 ELF section. */ 1985 1986 static int 1987 elf_s390_relocate_section (bfd *output_bfd, 1988 struct bfd_link_info *info, 1989 bfd *input_bfd, 1990 asection *input_section, 1991 bfd_byte *contents, 1992 Elf_Internal_Rela *relocs, 1993 Elf_Internal_Sym *local_syms, 1994 asection **local_sections) 1995 { 1996 struct elf_s390_link_hash_table *htab; 1997 Elf_Internal_Shdr *symtab_hdr; 1998 struct elf_link_hash_entry **sym_hashes; 1999 bfd_vma *local_got_offsets; 2000 Elf_Internal_Rela *rel; 2001 Elf_Internal_Rela *relend; 2002 2003 if (!is_s390_elf (input_bfd)) 2004 { 2005 bfd_set_error (bfd_error_wrong_format); 2006 return false; 2007 } 2008 2009 htab = elf_s390_hash_table (info); 2010 if (htab == NULL) 2011 return false; 2012 2013 symtab_hdr = &elf_symtab_hdr (input_bfd); 2014 sym_hashes = elf_sym_hashes (input_bfd); 2015 local_got_offsets = elf_local_got_offsets (input_bfd); 2016 2017 rel = relocs; 2018 relend = relocs + input_section->reloc_count; 2019 for (; rel < relend; rel++) 2020 { 2021 unsigned int r_type; 2022 reloc_howto_type *howto; 2023 unsigned long r_symndx; 2024 struct elf_link_hash_entry *h; 2025 Elf_Internal_Sym *sym; 2026 asection *sec; 2027 bfd_vma off; 2028 bfd_vma relocation; 2029 bool unresolved_reloc; 2030 bfd_reloc_status_type r; 2031 int tls_type; 2032 bool resolved_to_zero; 2033 2034 r_type = ELF64_R_TYPE (rel->r_info); 2035 if (r_type == (int) R_390_GNU_VTINHERIT 2036 || r_type == (int) R_390_GNU_VTENTRY) 2037 continue; 2038 if (r_type >= (int) R_390_max) 2039 { 2040 bfd_set_error (bfd_error_bad_value); 2041 return false; 2042 } 2043 2044 howto = elf_howto_table + r_type; 2045 r_symndx = ELF64_R_SYM (rel->r_info); 2046 2047 h = NULL; 2048 sym = NULL; 2049 sec = NULL; 2050 unresolved_reloc = false; 2051 if (r_symndx < symtab_hdr->sh_info) 2052 { 2053 sym = local_syms + r_symndx; 2054 sec = local_sections[r_symndx]; 2055 2056 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2057 { 2058 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd); 2059 if (local_plt == NULL) 2060 return false; 2061 2062 /* Address of the PLT slot. */ 2063 relocation = (htab->elf.iplt->output_section->vma 2064 + htab->elf.iplt->output_offset 2065 + local_plt[r_symndx].plt.offset); 2066 2067 switch (r_type) 2068 { 2069 case R_390_PLTOFF16: 2070 case R_390_PLTOFF32: 2071 case R_390_PLTOFF64: 2072 relocation -= s390_got_pointer (info); 2073 break; 2074 case R_390_GOTPLT12: 2075 case R_390_GOTPLT16: 2076 case R_390_GOTPLT20: 2077 case R_390_GOTPLT32: 2078 case R_390_GOTPLT64: 2079 case R_390_GOTPLTENT: 2080 case R_390_GOT12: 2081 case R_390_GOT16: 2082 case R_390_GOT20: 2083 case R_390_GOT32: 2084 case R_390_GOT64: 2085 case R_390_GOTENT: 2086 { 2087 /* Write the PLT slot address into the GOT slot. */ 2088 bfd_put_64 (output_bfd, relocation, 2089 htab->elf.sgot->contents + 2090 local_got_offsets[r_symndx]); 2091 relocation = (local_got_offsets[r_symndx] + 2092 s390_got_offset (info)); 2093 2094 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2095 relocation += s390_got_pointer (info); 2096 break; 2097 } 2098 default: 2099 break; 2100 } 2101 /* The output section is needed later in 2102 finish_dynamic_section when creating the dynamic 2103 relocation. */ 2104 local_plt[r_symndx].sec = sec; 2105 goto do_relocation; 2106 } 2107 else 2108 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2109 } 2110 else 2111 { 2112 bool warned ATTRIBUTE_UNUSED; 2113 bool ignored ATTRIBUTE_UNUSED; 2114 2115 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2116 r_symndx, symtab_hdr, sym_hashes, 2117 h, sec, relocation, 2118 unresolved_reloc, warned, ignored); 2119 } 2120 2121 if (sec != NULL && discarded_section (sec)) 2122 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2123 rel, 1, relend, howto, 0, contents); 2124 2125 if (bfd_link_relocatable (info)) 2126 continue; 2127 2128 resolved_to_zero = (h != NULL 2129 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)); 2130 2131 switch (r_type) 2132 { 2133 case R_390_GOTPLT12: 2134 case R_390_GOTPLT16: 2135 case R_390_GOTPLT20: 2136 case R_390_GOTPLT32: 2137 case R_390_GOTPLT64: 2138 case R_390_GOTPLTENT: 2139 /* There are three cases for a GOTPLT relocation. 1) The 2140 relocation is against the jump slot entry of a plt that 2141 will get emitted to the output file. 2) The relocation 2142 is against the jump slot of a plt entry that has been 2143 removed. elf_s390_adjust_gotplt has created a GOT entry 2144 as replacement. 3) The relocation is against a local symbol. 2145 Cases 2) and 3) are the same as the GOT relocation code 2146 so we just have to test for case 1 and fall through for 2147 the other two. */ 2148 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2149 { 2150 bfd_vma plt_index; 2151 2152 if (s390_is_ifunc_symbol_p (h)) 2153 { 2154 /* Entry indices of .iplt and .igot.plt match 2155 1:1. No magic PLT first entry here. */ 2156 plt_index = h->plt.offset / PLT_ENTRY_SIZE; 2157 relocation = (plt_index * GOT_ENTRY_SIZE 2158 + s390_gotplt_offset (info) 2159 + htab->elf.igotplt->output_offset); 2160 } 2161 else 2162 { 2163 plt_index = ((h->plt.offset - PLT_FIRST_ENTRY_SIZE) 2164 / PLT_ENTRY_SIZE); 2165 2166 relocation = (plt_index * GOT_ENTRY_SIZE 2167 + s390_gotplt_offset (info)); 2168 } 2169 if (r_type == R_390_GOTPLTENT) 2170 relocation += s390_got_pointer (info); 2171 unresolved_reloc = false; 2172 break; 2173 } 2174 /* Fall through. */ 2175 2176 case R_390_GOT12: 2177 case R_390_GOT16: 2178 case R_390_GOT20: 2179 case R_390_GOT32: 2180 case R_390_GOT64: 2181 case R_390_GOTENT: 2182 /* Relocation is to the entry for this symbol in the global 2183 offset table. */ 2184 if (htab->elf.sgot == NULL) 2185 abort (); 2186 2187 if (h != NULL) 2188 { 2189 bool dyn; 2190 2191 off = h->got.offset; 2192 dyn = htab->elf.dynamic_sections_created; 2193 2194 if (s390_is_ifunc_symbol_p (h)) 2195 { 2196 BFD_ASSERT (h->plt.offset != (bfd_vma) -1); 2197 if (off == (bfd_vma)-1) 2198 { 2199 /* No explicit GOT usage so redirect to the 2200 got.iplt slot. */ 2201 relocation = (s390_gotplt_offset (info) 2202 + htab->elf.igotplt->output_offset 2203 + (h->plt.offset / PLT_ENTRY_SIZE 2204 * GOT_ENTRY_SIZE)); 2205 2206 /* For @GOTENT the relocation is against the offset between 2207 the instruction and the symbols entry in the GOT and not 2208 between the start of the GOT and the symbols entry. We 2209 add the vma of the GOT to get the correct value. */ 2210 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2211 relocation += s390_got_pointer (info); 2212 2213 break; 2214 } 2215 else 2216 { 2217 /* Explicit GOT slots must contain the address 2218 of the PLT slot. This will be handled in 2219 finish_dynamic_symbol. */ 2220 } 2221 } 2222 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 2223 bfd_link_pic (info), 2224 h) 2225 || (bfd_link_pic (info) 2226 && SYMBOL_REFERENCES_LOCAL (info, h)) 2227 || resolved_to_zero) 2228 { 2229 Elf_Internal_Sym *isym; 2230 asection *sym_sec; 2231 2232 /* This is actually a static link, or it is a 2233 -Bsymbolic link and the symbol is defined 2234 locally, or the symbol was forced to be local 2235 because of a version file. We must initialize 2236 this entry in the global offset table. Since the 2237 offset must always be a multiple of 2, we use the 2238 least significant bit to record whether we have 2239 initialized it already. 2240 2241 When doing a dynamic link, we create a .rel.got 2242 relocation entry to initialize the value. This 2243 is done in the finish_dynamic_symbol routine. */ 2244 if ((off & 1) != 0) 2245 off &= ~1; 2246 else 2247 { 2248 bfd_put_64 (output_bfd, relocation, 2249 htab->elf.sgot->contents + off); 2250 h->got.offset |= 1; 2251 } 2252 2253 /* When turning a GOT slot dereference into a direct 2254 reference using larl we have to make sure that 2255 the symbol is 1. properly aligned and 2. it is no 2256 ABS symbol or will become one. */ 2257 if ((h->def_regular 2258 && bfd_link_pic (info) 2259 && SYMBOL_REFERENCES_LOCAL (info, h)) 2260 /* lgrl rx,sym@GOTENT -> larl rx, sym */ 2261 && ((r_type == R_390_GOTENT 2262 && (bfd_get_16 (input_bfd, 2263 contents + rel->r_offset - 2) 2264 & 0xff0f) == 0xc408) 2265 /* lg rx, sym@GOT(r12) -> larl rx, sym */ 2266 || (r_type == R_390_GOT20 2267 && (bfd_get_32 (input_bfd, 2268 contents + rel->r_offset - 2) 2269 & 0xff00f000) == 0xe300c000 2270 && bfd_get_8 (input_bfd, 2271 contents + rel->r_offset + 3) == 0x04)) 2272 && (isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 2273 input_bfd, r_symndx)) 2274 && isym->st_shndx != SHN_ABS 2275 && h != htab->elf.hdynamic 2276 && h != htab->elf.hgot 2277 && h != htab->elf.hplt 2278 && !(isym->st_value & 1) 2279 && (sym_sec = bfd_section_from_elf_index (input_bfd, 2280 isym->st_shndx)) 2281 && sym_sec->alignment_power) 2282 { 2283 unsigned short new_insn = 2284 (0xc000 | (bfd_get_8 (input_bfd, 2285 contents + rel->r_offset - 1) & 0xf0)); 2286 bfd_put_16 (output_bfd, new_insn, 2287 contents + rel->r_offset - 2); 2288 r_type = R_390_PC32DBL; 2289 rel->r_addend = 2; 2290 howto = elf_howto_table + r_type; 2291 relocation = h->root.u.def.value 2292 + h->root.u.def.section->output_section->vma 2293 + h->root.u.def.section->output_offset; 2294 goto do_relocation; 2295 } 2296 } 2297 else 2298 unresolved_reloc = false; 2299 } 2300 else 2301 { 2302 if (local_got_offsets == NULL) 2303 abort (); 2304 2305 off = local_got_offsets[r_symndx]; 2306 2307 /* The offset must always be a multiple of 8. We use 2308 the least significant bit to record whether we have 2309 already generated the necessary reloc. */ 2310 if ((off & 1) != 0) 2311 off &= ~1; 2312 else 2313 { 2314 bfd_put_64 (output_bfd, relocation, 2315 htab->elf.sgot->contents + off); 2316 2317 if (bfd_link_pic (info)) 2318 { 2319 asection *s; 2320 Elf_Internal_Rela outrel; 2321 bfd_byte *loc; 2322 2323 s = htab->elf.srelgot; 2324 if (s == NULL) 2325 abort (); 2326 2327 outrel.r_offset = (htab->elf.sgot->output_section->vma 2328 + htab->elf.sgot->output_offset 2329 + off); 2330 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2331 outrel.r_addend = relocation; 2332 loc = s->contents; 2333 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2334 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2335 } 2336 2337 local_got_offsets[r_symndx] |= 1; 2338 } 2339 } 2340 2341 if (off >= (bfd_vma) -2) 2342 abort (); 2343 2344 relocation = s390_got_offset (info) + off; 2345 2346 /* For @GOTENT the relocation is against the offset between 2347 the instruction and the symbols entry in the GOT and not 2348 between the start of the GOT and the symbols entry. We 2349 add the vma of the GOT to get the correct value. */ 2350 if ( r_type == R_390_GOTENT 2351 || r_type == R_390_GOTPLTENT) 2352 relocation += s390_got_pointer (info); 2353 2354 break; 2355 2356 case R_390_GOTOFF16: 2357 case R_390_GOTOFF32: 2358 case R_390_GOTOFF64: 2359 /* Relocation is relative to the start of the global offset 2360 table. */ 2361 2362 if (h != NULL 2363 && s390_is_ifunc_symbol_p (h) 2364 && h->def_regular 2365 && !bfd_link_executable (info)) 2366 { 2367 relocation = (htab->elf.iplt->output_section->vma 2368 + htab->elf.iplt->output_offset 2369 + h->plt.offset 2370 - s390_got_pointer (info)); 2371 goto do_relocation; 2372 } 2373 2374 relocation -= s390_got_pointer (info); 2375 break; 2376 2377 case R_390_GOTPC: 2378 case R_390_GOTPCDBL: 2379 /* Use global offset table as symbol value. */ 2380 relocation = s390_got_pointer (info); 2381 unresolved_reloc = false; 2382 break; 2383 2384 case R_390_PLT12DBL: 2385 case R_390_PLT16DBL: 2386 case R_390_PLT24DBL: 2387 case R_390_PLT32: 2388 case R_390_PLT32DBL: 2389 case R_390_PLT64: 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 && !s390_is_ifunc_symbol_p (h))) 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 if (s390_is_ifunc_symbol_p (h)) 2407 relocation = (htab->elf.iplt->output_section->vma 2408 + htab->elf.iplt->output_offset 2409 + h->plt.offset); 2410 else 2411 relocation = (htab->elf.splt->output_section->vma 2412 + htab->elf.splt->output_offset 2413 + h->plt.offset); 2414 unresolved_reloc = false; 2415 break; 2416 2417 case R_390_PLTOFF16: 2418 case R_390_PLTOFF32: 2419 case R_390_PLTOFF64: 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 -= s390_got_pointer (info); 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 - s390_got_pointer (info)); 2438 else 2439 relocation = (htab->elf.splt->output_section->vma 2440 + htab->elf.splt->output_offset 2441 + h->plt.offset 2442 - s390_got_pointer (info)); 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_PC32: 2451 case R_390_PC32DBL: 2452 case R_390_PC64: 2453 if (h != NULL 2454 && bfd_link_pie (info) 2455 && !h->def_regular) 2456 { 2457 _bfd_error_handler (_("%pB: `%s' non-PLT reloc for symbol defined " 2458 "in shared library and accessed " 2459 "from executable " 2460 "(rebuild file with -fPIC ?)"), 2461 input_bfd, h->root.root.string); 2462 bfd_set_error (bfd_error_bad_value); 2463 return false; 2464 } 2465 /* The target of these relocs are instruction operands 2466 residing in read-only sections. We cannot emit a runtime 2467 reloc for it. */ 2468 if (h != NULL 2469 && s390_is_ifunc_symbol_p (h) 2470 && h->def_regular 2471 && bfd_link_pic (info)) 2472 { 2473 relocation = (htab->elf.iplt->output_section->vma 2474 + htab->elf.iplt->output_offset 2475 + h->plt.offset); 2476 goto do_relocation; 2477 } 2478 2479 /* Replace relative long addressing instructions of weak 2480 symbols, which will definitely resolve to zero, with 2481 either a load address of 0, a NOP, or a trapping insn. 2482 This prevents the PC32DBL relocation from overflowing in 2483 case the binary will be loaded at 4GB or more. */ 2484 if (h != NULL 2485 && h->root.type == bfd_link_hash_undefweak 2486 && !h->root.linker_def 2487 && (bfd_link_executable (info) 2488 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 2489 && r_type == R_390_PC32DBL 2490 && rel->r_offset >= 2) 2491 { 2492 void *insn_start = contents + rel->r_offset - 2; 2493 uint16_t op = bfd_get_16 (input_bfd, insn_start) & 0xff0f; 2494 uint8_t reg = bfd_get_8 (input_bfd, insn_start + 1) & 0xf0; 2495 2496 /* NOTE: The order of the if's is important! */ 2497 /* Replace load address relative long (larl) with load 2498 address (lay) */ 2499 if (op == 0xc000) 2500 { 2501 /* larl rX,<weak sym> -> lay rX,0(0) */ 2502 bfd_put_16 (output_bfd, 0xe300 | reg, insn_start); 2503 bfd_put_32 (output_bfd, 0x71, insn_start + 2); 2504 continue; 2505 } 2506 /* Replace prefetch data relative long (pfdrl) with a NOP */ 2507 else if (op == 0xc602) 2508 { 2509 /* Emit a 6-byte NOP: jgnop . */ 2510 bfd_put_16 (output_bfd, 0xc004, insn_start); 2511 bfd_put_32 (output_bfd, 0x0, insn_start + 2); 2512 continue; 2513 } 2514 /* Replace the following instructions with a trap: 2515 - branch relative and save long (brasl) 2516 - load (logical) relative long (lrl, lgrl, lgfrl, llgfrl) 2517 - load (logical) halfword relative long (lhrl, lghrl, llhrl, llghrl) 2518 - store relative long (strl, stgrl) 2519 - store halfword relative long (sthrl) 2520 - execute relative long (exrl) 2521 - compare (logical) relative long (crl, clrl, cgrl, clgrl, cgfrl, clgfrl) 2522 - compare (logical) halfword relative long (chrl, cghrl, clhrl, clghrl) 2523 - branch relative on count high (brcth) */ 2524 else if (op == 0xc005 || (op & 0xff00) == 0xc400 2525 || (op & 0xff00) == 0xc600 || op == 0xcc06) 2526 { 2527 /* Emit a 6-byte trap: jg .+2 */ 2528 bfd_put_16 (output_bfd, 0xc0f4, insn_start); 2529 bfd_put_32 (output_bfd, 0x1, insn_start + 2); 2530 continue; 2531 } 2532 } 2533 /* Fall through. */ 2534 2535 case R_390_8: 2536 case R_390_16: 2537 case R_390_32: 2538 case R_390_64: 2539 2540 if ((input_section->flags & SEC_ALLOC) == 0) 2541 break; 2542 2543 if (h != NULL 2544 && s390_is_ifunc_symbol_p (h) 2545 && h->def_regular) 2546 { 2547 if (!bfd_link_pic (info)) 2548 { 2549 /* For a non-shared object the symbol will not 2550 change. Hence we can write the address of the 2551 target IPLT slot now. */ 2552 relocation = (htab->elf.iplt->output_section->vma 2553 + htab->elf.iplt->output_offset 2554 + h ->plt.offset); 2555 goto do_relocation; 2556 } 2557 else 2558 { 2559 /* For shared objects a runtime relocation is needed. */ 2560 2561 Elf_Internal_Rela outrel; 2562 asection *sreloc; 2563 2564 /* Need a dynamic relocation to get the real function 2565 address. */ 2566 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2567 info, 2568 input_section, 2569 rel->r_offset); 2570 if (outrel.r_offset == (bfd_vma) -1 2571 || outrel.r_offset == (bfd_vma) -2) 2572 abort (); 2573 2574 outrel.r_offset += (input_section->output_section->vma 2575 + input_section->output_offset); 2576 2577 if (h->dynindx == -1 2578 || h->forced_local 2579 || bfd_link_executable (info)) 2580 { 2581 /* This symbol is resolved locally. */ 2582 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE); 2583 outrel.r_addend = (h->root.u.def.value 2584 + h->root.u.def.section->output_section->vma 2585 + h->root.u.def.section->output_offset); 2586 } 2587 else 2588 { 2589 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2590 outrel.r_addend = 0; 2591 } 2592 2593 sreloc = htab->elf.irelifunc; 2594 elf_append_rela (output_bfd, sreloc, &outrel); 2595 2596 /* If this reloc is against an external symbol, we 2597 do not want to fiddle with the addend. Otherwise, 2598 we need to include the symbol value so that it 2599 becomes an addend for the dynamic reloc. For an 2600 internal symbol, we have updated addend. */ 2601 continue; 2602 } 2603 } 2604 2605 if ((bfd_link_pic (info) 2606 && (h == NULL 2607 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2608 && !resolved_to_zero) 2609 || h->root.type != bfd_link_hash_undefweak) 2610 && ((r_type != R_390_PC16 2611 && r_type != R_390_PC12DBL 2612 && r_type != R_390_PC16DBL 2613 && r_type != R_390_PC24DBL 2614 && r_type != R_390_PC32 2615 && r_type != R_390_PC32DBL 2616 && r_type != R_390_PC64) 2617 || !SYMBOL_CALLS_LOCAL (info, h))) 2618 || (ELIMINATE_COPY_RELOCS 2619 && !bfd_link_pic (info) 2620 && h != NULL 2621 && h->dynindx != -1 2622 && !h->non_got_ref 2623 && ((h->def_dynamic 2624 && !h->def_regular) 2625 || h->root.type == bfd_link_hash_undefweak 2626 || h->root.type == bfd_link_hash_undefined))) 2627 { 2628 Elf_Internal_Rela outrel; 2629 bool skip, relocate; 2630 asection *sreloc; 2631 bfd_byte *loc; 2632 2633 /* When generating a shared object, these relocations 2634 are copied into the output file to be resolved at run 2635 time. */ 2636 skip = false; 2637 relocate = false; 2638 2639 outrel.r_offset = 2640 _bfd_elf_section_offset (output_bfd, info, input_section, 2641 rel->r_offset); 2642 if (outrel.r_offset == (bfd_vma) -1) 2643 skip = true; 2644 else if (outrel.r_offset == (bfd_vma) -2) 2645 skip = true, relocate = true; 2646 2647 outrel.r_offset += (input_section->output_section->vma 2648 + input_section->output_offset); 2649 2650 if (skip) 2651 memset (&outrel, 0, sizeof outrel); 2652 else if (h != NULL 2653 && h->dynindx != -1 2654 && (r_type == R_390_PC16 2655 || r_type == R_390_PC12DBL 2656 || r_type == R_390_PC16DBL 2657 || r_type == R_390_PC24DBL 2658 || r_type == R_390_PC32 2659 || r_type == R_390_PC32DBL 2660 || r_type == R_390_PC64 2661 || !bfd_link_pic (info) 2662 || !SYMBOLIC_BIND (info, h) 2663 || !h->def_regular)) 2664 { 2665 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2666 outrel.r_addend = rel->r_addend; 2667 } 2668 else 2669 { 2670 /* This symbol is local, or marked to become local. */ 2671 outrel.r_addend = relocation + rel->r_addend; 2672 if (r_type == R_390_64) 2673 { 2674 relocate = true; 2675 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2676 } 2677 else 2678 { 2679 long sindx; 2680 2681 if (bfd_is_abs_section (sec)) 2682 sindx = 0; 2683 else if (sec == NULL || sec->owner == NULL) 2684 { 2685 bfd_set_error(bfd_error_bad_value); 2686 return false; 2687 } 2688 else 2689 { 2690 asection *osec; 2691 2692 osec = sec->output_section; 2693 sindx = elf_section_data (osec)->dynindx; 2694 2695 if (sindx == 0) 2696 { 2697 osec = htab->elf.text_index_section; 2698 sindx = elf_section_data (osec)->dynindx; 2699 } 2700 BFD_ASSERT (sindx != 0); 2701 2702 /* We are turning this relocation into one 2703 against a section symbol, so subtract out 2704 the output section's address but not the 2705 offset of the input section in the output 2706 section. */ 2707 outrel.r_addend -= osec->vma; 2708 } 2709 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2710 } 2711 } 2712 2713 sreloc = elf_section_data (input_section)->sreloc; 2714 if (sreloc == NULL) 2715 abort (); 2716 2717 loc = sreloc->contents; 2718 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2719 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2720 2721 /* If this reloc is against an external symbol, we do 2722 not want to fiddle with the addend. Otherwise, we 2723 need to include the symbol value so that it becomes 2724 an addend for the dynamic reloc. */ 2725 if (! relocate) 2726 continue; 2727 } 2728 2729 break; 2730 2731 /* Relocations for tls literal pool entries. */ 2732 case R_390_TLS_IE64: 2733 if (bfd_link_dll (info)) 2734 { 2735 Elf_Internal_Rela outrel; 2736 asection *sreloc; 2737 bfd_byte *loc; 2738 2739 outrel.r_offset = rel->r_offset 2740 + input_section->output_section->vma 2741 + input_section->output_offset; 2742 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2743 sreloc = elf_section_data (input_section)->sreloc; 2744 if (sreloc == NULL) 2745 abort (); 2746 loc = sreloc->contents; 2747 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2748 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc); 2749 } 2750 /* Fall through. */ 2751 2752 case R_390_TLS_GD64: 2753 case R_390_TLS_GOTIE64: 2754 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2755 tls_type = GOT_UNKNOWN; 2756 if (h == NULL && local_got_offsets) 2757 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2758 else if (h != NULL) 2759 { 2760 tls_type = elf_s390_hash_entry(h)->tls_type; 2761 if (!bfd_link_dll (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2762 r_type = R_390_TLS_LE64; 2763 } 2764 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE) 2765 r_type = R_390_TLS_IE64; 2766 2767 if (r_type == R_390_TLS_LE64) 2768 { 2769 /* This relocation gets optimized away by the local exec 2770 access optimization. */ 2771 BFD_ASSERT (! unresolved_reloc); 2772 bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend, 2773 contents + rel->r_offset); 2774 continue; 2775 } 2776 2777 if (htab->elf.sgot == NULL) 2778 abort (); 2779 2780 if (h != NULL) 2781 off = h->got.offset; 2782 else 2783 { 2784 if (local_got_offsets == NULL) 2785 abort (); 2786 2787 off = local_got_offsets[r_symndx]; 2788 } 2789 2790 emit_tls_relocs: 2791 2792 if ((off & 1) != 0) 2793 off &= ~1; 2794 else 2795 { 2796 Elf_Internal_Rela outrel; 2797 bfd_byte *loc; 2798 int dr_type, indx; 2799 2800 if (htab->elf.srelgot == NULL) 2801 abort (); 2802 2803 outrel.r_offset = (htab->elf.sgot->output_section->vma 2804 + htab->elf.sgot->output_offset + off); 2805 2806 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2807 if (r_type == R_390_TLS_GD64) 2808 dr_type = R_390_TLS_DTPMOD; 2809 else 2810 dr_type = R_390_TLS_TPOFF; 2811 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2812 outrel.r_addend = relocation - dtpoff_base (info); 2813 else 2814 outrel.r_addend = 0; 2815 outrel.r_info = ELF64_R_INFO (indx, dr_type); 2816 loc = htab->elf.srelgot->contents; 2817 loc += htab->elf.srelgot->reloc_count++ 2818 * sizeof (Elf64_External_Rela); 2819 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2820 2821 if (r_type == R_390_TLS_GD64) 2822 { 2823 if (indx == 0) 2824 { 2825 BFD_ASSERT (! unresolved_reloc); 2826 bfd_put_64 (output_bfd, 2827 relocation - dtpoff_base (info), 2828 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 2829 } 2830 else 2831 { 2832 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF); 2833 outrel.r_offset += GOT_ENTRY_SIZE; 2834 outrel.r_addend = 0; 2835 htab->elf.srelgot->reloc_count++; 2836 loc += sizeof (Elf64_External_Rela); 2837 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2838 } 2839 } 2840 2841 if (h != NULL) 2842 h->got.offset |= 1; 2843 else 2844 local_got_offsets[r_symndx] |= 1; 2845 } 2846 2847 if (off >= (bfd_vma) -2) 2848 abort (); 2849 if (r_type == ELF64_R_TYPE (rel->r_info)) 2850 { 2851 relocation = htab->elf.sgot->output_offset + off; 2852 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT) 2853 relocation += htab->elf.sgot->output_section->vma; 2854 unresolved_reloc = false; 2855 } 2856 else 2857 { 2858 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off, 2859 contents + rel->r_offset); 2860 continue; 2861 } 2862 break; 2863 2864 case R_390_TLS_GOTIE12: 2865 case R_390_TLS_GOTIE20: 2866 case R_390_TLS_IEENT: 2867 if (h == NULL) 2868 { 2869 if (local_got_offsets == NULL) 2870 abort(); 2871 off = local_got_offsets[r_symndx]; 2872 if (bfd_link_dll (info)) 2873 goto emit_tls_relocs; 2874 } 2875 else 2876 { 2877 off = h->got.offset; 2878 tls_type = elf_s390_hash_entry(h)->tls_type; 2879 if (bfd_link_dll (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE) 2880 goto emit_tls_relocs; 2881 } 2882 2883 if (htab->elf.sgot == NULL) 2884 abort (); 2885 2886 BFD_ASSERT (! unresolved_reloc); 2887 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2888 htab->elf.sgot->contents + off); 2889 relocation = htab->elf.sgot->output_offset + off; 2890 if (r_type == R_390_TLS_IEENT) 2891 relocation += htab->elf.sgot->output_section->vma; 2892 unresolved_reloc = false; 2893 break; 2894 2895 case R_390_TLS_LDM64: 2896 if (! bfd_link_dll (info)) 2897 /* The literal pool entry this relocation refers to gets ignored 2898 by the optimized code of the local exec model. Do nothing 2899 and the value will turn out zero. */ 2900 continue; 2901 2902 if (htab->elf.sgot == NULL) 2903 abort (); 2904 2905 off = htab->tls_ldm_got.offset; 2906 if (off & 1) 2907 off &= ~1; 2908 else 2909 { 2910 Elf_Internal_Rela outrel; 2911 bfd_byte *loc; 2912 2913 if (htab->elf.srelgot == NULL) 2914 abort (); 2915 2916 outrel.r_offset = (htab->elf.sgot->output_section->vma 2917 + htab->elf.sgot->output_offset + off); 2918 2919 bfd_put_64 (output_bfd, 0, 2920 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 2921 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD); 2922 outrel.r_addend = 0; 2923 loc = htab->elf.srelgot->contents; 2924 loc += htab->elf.srelgot->reloc_count++ 2925 * sizeof (Elf64_External_Rela); 2926 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2927 htab->tls_ldm_got.offset |= 1; 2928 } 2929 relocation = htab->elf.sgot->output_offset + off; 2930 unresolved_reloc = false; 2931 break; 2932 2933 case R_390_TLS_LE64: 2934 if (bfd_link_dll (info)) 2935 { 2936 /* Linking a shared library with non-fpic code requires 2937 a R_390_TLS_TPOFF relocation. */ 2938 Elf_Internal_Rela outrel; 2939 asection *sreloc; 2940 bfd_byte *loc; 2941 int indx; 2942 2943 outrel.r_offset = rel->r_offset 2944 + input_section->output_section->vma 2945 + input_section->output_offset; 2946 if (h != NULL && h->dynindx != -1) 2947 indx = h->dynindx; 2948 else 2949 indx = 0; 2950 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF); 2951 if (indx == 0) 2952 outrel.r_addend = relocation - dtpoff_base (info); 2953 else 2954 outrel.r_addend = 0; 2955 sreloc = elf_section_data (input_section)->sreloc; 2956 if (sreloc == NULL) 2957 abort (); 2958 loc = sreloc->contents; 2959 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2960 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2961 } 2962 else 2963 { 2964 BFD_ASSERT (! unresolved_reloc); 2965 bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend, 2966 contents + rel->r_offset); 2967 } 2968 continue; 2969 2970 case R_390_TLS_LDO64: 2971 if (bfd_link_dll (info) || (input_section->flags & SEC_DEBUGGING)) 2972 relocation -= dtpoff_base (info); 2973 else 2974 /* When converting LDO to LE, we must negate. */ 2975 relocation = -tpoff (info, relocation); 2976 break; 2977 2978 /* Relocations for tls instructions. */ 2979 case R_390_TLS_LOAD: 2980 case R_390_TLS_GDCALL: 2981 case R_390_TLS_LDCALL: 2982 tls_type = GOT_UNKNOWN; 2983 if (h == NULL && local_got_offsets) 2984 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2985 else if (h != NULL) 2986 tls_type = elf_s390_hash_entry(h)->tls_type; 2987 2988 if (tls_type == GOT_TLS_GD) 2989 continue; 2990 2991 if (r_type == R_390_TLS_LOAD) 2992 { 2993 if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1)) 2994 { 2995 /* IE->LE transition. Four valid cases: 2996 lg %rx,(0,%ry) -> sllg %rx,%ry,0 2997 lg %rx,(%ry,0) -> sllg %rx,%ry,0 2998 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 2999 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */ 3000 unsigned int insn0, insn1, ry; 3001 3002 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 3003 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3004 if (insn1 != 0x0004) 3005 { 3006 invalid_tls_insn (input_bfd, input_section, rel); 3007 return false; 3008 } 3009 if ((insn0 & 0xff00f000) == 0xe3000000) 3010 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */ 3011 ry = (insn0 & 0x000f0000); 3012 else if ((insn0 & 0xff0f0000) == 0xe3000000) 3013 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */ 3014 ry = (insn0 & 0x0000f000) << 4; 3015 else if ((insn0 & 0xff00f000) == 0xe300c000) 3016 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */ 3017 ry = (insn0 & 0x000f0000); 3018 else if ((insn0 & 0xff0f0000) == 0xe30c0000) 3019 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */ 3020 ry = (insn0 & 0x0000f000) << 4; 3021 else 3022 { 3023 invalid_tls_insn (input_bfd, input_section, rel); 3024 return false; 3025 } 3026 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry; 3027 insn1 = 0x000d; 3028 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3029 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3030 } 3031 } 3032 else if (r_type == R_390_TLS_GDCALL) 3033 { 3034 unsigned int insn0, insn1; 3035 3036 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 3037 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3038 if ((insn0 & 0xffff0000) != 0xc0e50000) 3039 { 3040 invalid_tls_insn (input_bfd, input_section, rel); 3041 return false; 3042 } 3043 if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1)) 3044 { 3045 /* GD->LE transition. 3046 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 3047 insn0 = 0xc0040000; 3048 insn1 = 0x0000; 3049 } 3050 else 3051 { 3052 /* GD->IE transition. 3053 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */ 3054 insn0 = 0xe322c000; 3055 insn1 = 0x0004; 3056 } 3057 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3058 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3059 } 3060 else if (r_type == R_390_TLS_LDCALL) 3061 { 3062 if (!bfd_link_dll (info)) 3063 { 3064 unsigned int insn0, insn1; 3065 3066 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 3067 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3068 if ((insn0 & 0xffff0000) != 0xc0e50000) 3069 { 3070 invalid_tls_insn (input_bfd, input_section, rel); 3071 return false; 3072 } 3073 /* LD->LE transition. 3074 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 3075 insn0 = 0xc0040000; 3076 insn1 = 0x0000; 3077 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3078 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3079 } 3080 } 3081 continue; 3082 3083 default: 3084 break; 3085 } 3086 3087 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3088 because such sections are not SEC_ALLOC and thus ld.so will 3089 not process them. */ 3090 if (unresolved_reloc 3091 && !((input_section->flags & SEC_DEBUGGING) != 0 3092 && h->def_dynamic) 3093 && _bfd_elf_section_offset (output_bfd, info, input_section, 3094 rel->r_offset) != (bfd_vma) -1) 3095 _bfd_error_handler 3096 /* xgettext:c-format */ 3097 (_("%pB(%pA+%#" PRIx64 "): " 3098 "unresolvable %s relocation against symbol `%s'"), 3099 input_bfd, 3100 input_section, 3101 (uint64_t) rel->r_offset, 3102 howto->name, 3103 h->root.root.string); 3104 3105 do_relocation: 3106 3107 /* When applying a 24 bit reloc we need to start one byte 3108 earlier. Otherwise the 32 bit get/put bfd operations might 3109 access a byte after the actual section. */ 3110 if (r_type == R_390_PC24DBL 3111 || r_type == R_390_PLT24DBL) 3112 rel->r_offset--; 3113 3114 /* Issue an error if the right shift implied by the relocation 3115 would drop bits from the symbol value. */ 3116 if (howto->rightshift 3117 && (relocation & (((bfd_vma)1 << howto->rightshift) - 1))) 3118 { 3119 _bfd_error_handler 3120 /* xgettext:c-format */ 3121 (_("%pB(%pA+%#" PRIx64 "): " 3122 "misaligned symbol `%s' (%#" PRIx64 ") for relocation %s"), 3123 input_bfd, 3124 input_section, 3125 (uint64_t) rel->r_offset, 3126 h->root.root.string, 3127 (uint64_t)relocation, 3128 howto->name); 3129 return false; 3130 } 3131 3132 if (r_type == R_390_20 3133 || r_type == R_390_GOT20 3134 || r_type == R_390_GOTPLT20 3135 || r_type == R_390_TLS_GOTIE20) 3136 { 3137 relocation += rel->r_addend; 3138 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3139 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3140 contents, rel->r_offset, 3141 relocation, 0); 3142 } 3143 else 3144 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3145 contents, rel->r_offset, 3146 relocation, rel->r_addend); 3147 3148 if (r != bfd_reloc_ok) 3149 { 3150 const char *name; 3151 3152 if (h != NULL) 3153 name = h->root.root.string; 3154 else 3155 { 3156 name = bfd_elf_string_from_elf_section (input_bfd, 3157 symtab_hdr->sh_link, 3158 sym->st_name); 3159 if (name == NULL) 3160 return false; 3161 if (*name == '\0') 3162 name = bfd_section_name (sec); 3163 } 3164 3165 if (r == bfd_reloc_overflow) 3166 (*info->callbacks->reloc_overflow) 3167 (info, (h ? &h->root : NULL), name, howto->name, 3168 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3169 else 3170 { 3171 _bfd_error_handler 3172 /* xgettext:c-format */ 3173 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 3174 input_bfd, input_section, 3175 (uint64_t) rel->r_offset, name, (int) r); 3176 return false; 3177 } 3178 } 3179 } 3180 3181 return true; 3182 } 3183 3184 /* Generate the PLT slots together with the dynamic relocations needed 3185 for IFUNC symbols. */ 3186 3187 static void 3188 elf_s390_finish_ifunc_symbol (bfd *output_bfd, 3189 struct bfd_link_info *info, 3190 struct elf_link_hash_entry *h, 3191 struct elf_s390_link_hash_table *htab, 3192 bfd_vma plt_offset, 3193 bfd_vma resolver_address) 3194 { 3195 bfd_vma plt_index; 3196 bfd_vma got_offset; 3197 Elf_Internal_Rela rela; 3198 bfd_byte *loc; 3199 asection *plt, *gotplt, *relplt; 3200 3201 if (htab->elf.iplt == NULL 3202 || htab->elf.igotplt == NULL 3203 || htab->elf.irelplt == NULL) 3204 abort (); 3205 3206 /* Index of the PLT slot within iplt section. */ 3207 plt_index = plt_offset / PLT_ENTRY_SIZE; 3208 plt = htab->elf.iplt; 3209 /* Offset into the igot.plt section. */ 3210 got_offset = plt_index * GOT_ENTRY_SIZE; 3211 gotplt = htab->elf.igotplt; 3212 relplt = htab->elf.irelplt; 3213 3214 /* Fill in the blueprint of a PLT. */ 3215 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry, 3216 PLT_ENTRY_SIZE); 3217 3218 /* Fixup the relative address to the GOT entry */ 3219 bfd_put_32 (output_bfd, 3220 (gotplt->output_section->vma + 3221 gotplt->output_offset + got_offset 3222 - (plt->output_section->vma + 3223 plt->output_offset + 3224 plt_offset))/2, 3225 plt->contents + plt_offset + 2); 3226 /* Fixup the relative branch to PLT 0 */ 3227 bfd_put_32 (output_bfd, - (plt->output_offset + 3228 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3229 plt->contents + plt_offset + 24); 3230 /* Fixup offset into .rela.plt section. */ 3231 bfd_put_32 (output_bfd, relplt->output_offset + 3232 plt_index * sizeof (Elf64_External_Rela), 3233 plt->contents + plt_offset + 28); 3234 3235 /* Fill in the entry in the global offset table. 3236 Points to instruction after GOT offset. */ 3237 bfd_put_64 (output_bfd, 3238 (plt->output_section->vma 3239 + plt->output_offset 3240 + plt_offset 3241 + 14), 3242 gotplt->contents + got_offset); 3243 3244 /* Fill in the entry in the .rela.plt section. */ 3245 rela.r_offset = (gotplt->output_section->vma 3246 + gotplt->output_offset 3247 + got_offset); 3248 3249 if (!h 3250 || h->dynindx == -1 3251 || ((bfd_link_executable (info) 3252 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3253 && h->def_regular)) 3254 { 3255 /* The symbol can be locally resolved. */ 3256 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE); 3257 rela.r_addend = resolver_address; 3258 } 3259 else 3260 { 3261 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3262 rela.r_addend = 0; 3263 } 3264 3265 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela); 3266 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3267 } 3268 3269 3270 /* Finish up dynamic symbol handling. We set the contents of various 3271 dynamic sections here. */ 3272 3273 static bool 3274 elf_s390_finish_dynamic_symbol (bfd *output_bfd, 3275 struct bfd_link_info *info, 3276 struct elf_link_hash_entry *h, 3277 Elf_Internal_Sym *sym) 3278 { 3279 struct elf_s390_link_hash_table *htab; 3280 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; 3281 3282 htab = elf_s390_hash_table (info); 3283 3284 if (h->plt.offset != (bfd_vma) -1) 3285 { 3286 bfd_vma plt_index; 3287 bfd_vma gotplt_offset; 3288 Elf_Internal_Rela rela; 3289 bfd_byte *loc; 3290 3291 /* This symbol has an entry in the procedure linkage table. Set 3292 it up. */ 3293 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 3294 { 3295 elf_s390_finish_ifunc_symbol (output_bfd, info, h, 3296 htab, h->plt.offset, 3297 eh->ifunc_resolver_address + 3298 eh->ifunc_resolver_section->output_offset + 3299 eh->ifunc_resolver_section->output_section->vma); 3300 3301 /* Do not return yet. Handling of explicit GOT slots of 3302 IFUNC symbols is below. */ 3303 } 3304 else 3305 { 3306 if (h->dynindx == -1 3307 || htab->elf.splt == NULL 3308 || htab->elf.sgotplt == NULL 3309 || htab->elf.srelplt == NULL) 3310 abort (); 3311 3312 /* Calc. index no. 3313 Current offset - size first entry / entry size. */ 3314 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3315 3316 /* The slots in the .got.plt correspond to the PLT slots in 3317 the same order. */ 3318 gotplt_offset = plt_index * GOT_ENTRY_SIZE; 3319 3320 /* If .got.plt comes first it needs to contain the 3 header 3321 entries. */ 3322 if (!s390_gotplt_after_got_p (info)) 3323 gotplt_offset += 3 * GOT_ENTRY_SIZE; 3324 3325 /* Fill in the blueprint of a PLT. */ 3326 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry, 3327 PLT_ENTRY_SIZE); 3328 3329 /* The first instruction in the PLT entry is a LARL loading 3330 the address of the GOT slot. We write the 4 byte 3331 immediate operand of the LARL instruction here. */ 3332 bfd_put_32 (output_bfd, 3333 (htab->elf.sgotplt->output_section->vma + 3334 htab->elf.sgotplt->output_offset + gotplt_offset 3335 - (htab->elf.splt->output_section->vma + 3336 htab->elf.splt->output_offset + 3337 h->plt.offset))/2, 3338 htab->elf.splt->contents + h->plt.offset + 2); 3339 /* Fixup the relative branch to PLT 0 */ 3340 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + 3341 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3342 htab->elf.splt->contents + h->plt.offset + 24); 3343 /* Fixup offset into .rela.plt section. */ 3344 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), 3345 htab->elf.splt->contents + h->plt.offset + 28); 3346 3347 /* Fill in the entry in the global offset table. 3348 Points to instruction after GOT offset. */ 3349 bfd_put_64 (output_bfd, 3350 (htab->elf.splt->output_section->vma 3351 + htab->elf.splt->output_offset 3352 + h->plt.offset 3353 + 14), 3354 htab->elf.sgotplt->contents + gotplt_offset); 3355 3356 /* Fill in the entry in the .rela.plt section. */ 3357 rela.r_offset = (htab->elf.sgotplt->output_section->vma 3358 + htab->elf.sgotplt->output_offset 3359 + gotplt_offset); 3360 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3361 rela.r_addend = 0; 3362 loc = htab->elf.srelplt->contents + plt_index * 3363 sizeof (Elf64_External_Rela); 3364 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3365 3366 if (!h->def_regular) 3367 { 3368 /* Mark the symbol as undefined, rather than as defined in 3369 the .plt section. Leave the value alone. This is a clue 3370 for the dynamic linker, to make function pointer 3371 comparisons work between an application and shared 3372 library. */ 3373 sym->st_shndx = SHN_UNDEF; 3374 } 3375 } 3376 } 3377 3378 if (h->got.offset != (bfd_vma) -1 3379 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3380 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3381 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3382 { 3383 Elf_Internal_Rela rela; 3384 bfd_byte *loc; 3385 3386 /* This symbol has an entry in the global offset table. Set it 3387 up. */ 3388 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3389 abort (); 3390 3391 rela.r_offset = (htab->elf.sgot->output_section->vma 3392 + htab->elf.sgot->output_offset 3393 + (h->got.offset &~ (bfd_vma) 1)); 3394 3395 if (h->def_regular && s390_is_ifunc_symbol_p (h)) 3396 { 3397 if (bfd_link_pic (info)) 3398 { 3399 /* An explicit GOT slot usage needs GLOB_DAT. If the 3400 symbol references local the implicit got.iplt slot 3401 will be used and the IRELATIVE reloc has been created 3402 above. */ 3403 goto do_glob_dat; 3404 } 3405 else 3406 { 3407 /* For non-shared objects explicit GOT slots must be 3408 filled with the PLT slot address for pointer 3409 equality reasons. */ 3410 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma 3411 + htab->elf.iplt->output_offset 3412 + h->plt.offset), 3413 htab->elf.sgot->contents + h->got.offset); 3414 return true; 3415 } 3416 } 3417 else if (bfd_link_pic (info) 3418 && SYMBOL_REFERENCES_LOCAL (info, h)) 3419 { 3420 if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) 3421 return true; 3422 3423 /* If this is a static link, or it is a -Bsymbolic link and 3424 the symbol is defined locally or was forced to be local 3425 because of a version file, we just want to emit a 3426 RELATIVE reloc. The entry in the global offset table 3427 will already have been initialized in the 3428 relocate_section function. */ 3429 if (!(h->def_regular || ELF_COMMON_DEF_P (h))) 3430 return false; 3431 BFD_ASSERT((h->got.offset & 1) != 0); 3432 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 3433 rela.r_addend = (h->root.u.def.value 3434 + h->root.u.def.section->output_section->vma 3435 + h->root.u.def.section->output_offset); 3436 } 3437 else 3438 { 3439 BFD_ASSERT((h->got.offset & 1) == 0); 3440 do_glob_dat: 3441 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset); 3442 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); 3443 rela.r_addend = 0; 3444 } 3445 3446 loc = htab->elf.srelgot->contents; 3447 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3448 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3449 } 3450 3451 if (h->needs_copy) 3452 { 3453 Elf_Internal_Rela rela; 3454 asection *s; 3455 bfd_byte *loc; 3456 3457 /* This symbols needs a copy reloc. Set it up. */ 3458 3459 if (h->dynindx == -1 3460 || (h->root.type != bfd_link_hash_defined 3461 && h->root.type != bfd_link_hash_defweak) 3462 || htab->elf.srelbss == NULL) 3463 abort (); 3464 3465 rela.r_offset = (h->root.u.def.value 3466 + h->root.u.def.section->output_section->vma 3467 + h->root.u.def.section->output_offset); 3468 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); 3469 rela.r_addend = 0; 3470 if (h->root.u.def.section == htab->elf.sdynrelro) 3471 s = htab->elf.sreldynrelro; 3472 else 3473 s = htab->elf.srelbss; 3474 loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela); 3475 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3476 } 3477 3478 /* Mark some specially defined symbols as absolute. */ 3479 if (h == htab->elf.hdynamic 3480 || h == htab->elf.hgot 3481 || h == htab->elf.hplt) 3482 sym->st_shndx = SHN_ABS; 3483 3484 return true; 3485 } 3486 3487 /* Used to decide how to sort relocs in an optimal manner for the 3488 dynamic linker, before writing them out. */ 3489 3490 static enum elf_reloc_type_class 3491 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3492 const asection *rel_sec ATTRIBUTE_UNUSED, 3493 const Elf_Internal_Rela *rela) 3494 { 3495 bfd *abfd = info->output_bfd; 3496 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3497 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); 3498 unsigned long r_symndx = ELF64_R_SYM (rela->r_info); 3499 Elf_Internal_Sym sym; 3500 3501 if (htab->elf.dynsym == NULL 3502 || !bed->s->swap_symbol_in (abfd, 3503 (htab->elf.dynsym->contents 3504 + r_symndx * bed->s->sizeof_sym), 3505 0, &sym)) 3506 abort (); 3507 3508 /* Check relocation against STT_GNU_IFUNC symbol. */ 3509 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 3510 return reloc_class_ifunc; 3511 3512 switch ((int) ELF64_R_TYPE (rela->r_info)) 3513 { 3514 case R_390_RELATIVE: 3515 return reloc_class_relative; 3516 case R_390_JMP_SLOT: 3517 return reloc_class_plt; 3518 case R_390_COPY: 3519 return reloc_class_copy; 3520 default: 3521 return reloc_class_normal; 3522 } 3523 } 3524 3525 /* Finish up the dynamic sections. */ 3526 3527 static bool 3528 elf_s390_finish_dynamic_sections (bfd *output_bfd, 3529 struct bfd_link_info *info) 3530 { 3531 struct elf_s390_link_hash_table *htab; 3532 bfd *dynobj; 3533 asection *sdyn; 3534 bfd *ibfd; 3535 unsigned int i; 3536 3537 htab = elf_s390_hash_table (info); 3538 if (htab == NULL) 3539 return false; 3540 3541 dynobj = htab->elf.dynobj; 3542 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3543 3544 if (htab->elf.dynamic_sections_created) 3545 { 3546 Elf64_External_Dyn *dyncon, *dynconend; 3547 3548 if (sdyn == NULL || htab->elf.sgot == NULL) 3549 abort (); 3550 3551 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3552 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 3553 for (; dyncon < dynconend; dyncon++) 3554 { 3555 Elf_Internal_Dyn dyn; 3556 asection *s; 3557 3558 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3559 3560 switch (dyn.d_tag) 3561 { 3562 default: 3563 continue; 3564 3565 case DT_PLTGOT: 3566 /* DT_PLTGOT matches _GLOBAL_OFFSET_TABLE_ */ 3567 dyn.d_un.d_ptr = s390_got_pointer (info); 3568 break; 3569 3570 case DT_JMPREL: 3571 s = htab->elf.srelplt; 3572 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3573 break; 3574 3575 case DT_PLTRELSZ: 3576 dyn.d_un.d_val = htab->elf.srelplt->size; 3577 if (htab->elf.irelplt) 3578 dyn.d_un.d_val += htab->elf.irelplt->size; 3579 break; 3580 3581 case DT_RELASZ: 3582 /* The procedure linkage table relocs (DT_JMPREL) should 3583 not be included in the overall relocs (DT_RELA). 3584 Therefore, we override the DT_RELASZ entry here to 3585 make it not include the JMPREL relocs. Since the 3586 linker script arranges for .rela.plt to follow all 3587 other relocation sections, we don't have to worry 3588 about changing the DT_RELA entry. */ 3589 dyn.d_un.d_val -= htab->elf.srelplt->size; 3590 if (htab->elf.irelplt) 3591 dyn.d_un.d_val -= htab->elf.irelplt->size; 3592 break; 3593 } 3594 3595 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3596 } 3597 3598 /* Fill in the special first entry in the procedure linkage table. */ 3599 if (htab->elf.splt && htab->elf.splt->size > 0) 3600 { 3601 /* fill in blueprint for plt 0 entry */ 3602 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry, 3603 PLT_FIRST_ENTRY_SIZE); 3604 /* The second instruction in the first PLT entry is a LARL 3605 loading the GOT pointer. Fill in the LARL immediate 3606 address. */ 3607 bfd_put_32 (output_bfd, 3608 (s390_got_pointer (info) 3609 - htab->elf.splt->output_section->vma 3610 - htab->elf.splt->output_offset - 6)/2, 3611 htab->elf.splt->contents + 8); 3612 } 3613 if (elf_section_data (htab->elf.splt->output_section) != NULL) 3614 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize 3615 = PLT_ENTRY_SIZE; 3616 } 3617 3618 if (htab->elf.hgot && htab->elf.hgot->root.u.def.section) 3619 { 3620 /* Fill in the first three entries in the global offset table. */ 3621 if (htab->elf.hgot->root.u.def.section->size > 0) 3622 { 3623 bfd_put_64 (output_bfd, 3624 (sdyn == NULL ? (bfd_vma) 0 3625 : sdyn->output_section->vma + sdyn->output_offset), 3626 htab->elf.hgot->root.u.def.section->contents); 3627 /* One entry for shared object struct ptr. */ 3628 bfd_put_64 (output_bfd, (bfd_vma) 0, 3629 htab->elf.hgot->root.u.def.section->contents + 8); 3630 /* One entry for _dl_runtime_resolve. */ 3631 bfd_put_64 (output_bfd, (bfd_vma) 0, 3632 htab->elf.hgot->root.u.def.section->contents + 16); 3633 } 3634 if (htab->elf.sgot != NULL && htab->elf.sgot->size > 0) 3635 elf_section_data (htab->elf.sgot->output_section) 3636 ->this_hdr.sh_entsize = 8; 3637 } 3638 3639 /* Finish dynamic symbol for local IFUNC symbols. */ 3640 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 3641 { 3642 struct plt_entry *local_plt; 3643 Elf_Internal_Sym *isym; 3644 Elf_Internal_Shdr *symtab_hdr; 3645 3646 symtab_hdr = &elf_symtab_hdr (ibfd); 3647 3648 if (!is_s390_elf (ibfd)) 3649 continue; 3650 3651 local_plt = elf_s390_local_plt (ibfd); 3652 if (local_plt != NULL) 3653 for (i = 0; i < symtab_hdr->sh_info; i++) 3654 { 3655 if (local_plt[i].plt.offset != (bfd_vma) -1) 3656 { 3657 asection *sec = local_plt[i].sec; 3658 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i); 3659 if (isym == NULL) 3660 return false; 3661 3662 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 3663 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab, 3664 local_plt[i].plt.offset, 3665 isym->st_value 3666 + sec->output_section->vma 3667 + sec->output_offset); 3668 3669 } 3670 } 3671 } 3672 3673 return true; 3674 } 3675 3676 /* Support for core dump NOTE sections. */ 3678 3679 static bool 3680 elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 3681 { 3682 int offset; 3683 size_t size; 3684 3685 switch (note->descsz) 3686 { 3687 default: 3688 return false; 3689 3690 case 336: /* sizeof(struct elf_prstatus) on s390x */ 3691 /* pr_cursig */ 3692 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 3693 3694 /* pr_pid */ 3695 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32); 3696 3697 /* pr_reg */ 3698 offset = 112; 3699 size = 216; 3700 break; 3701 } 3702 3703 /* Make a ".reg/999" section. */ 3704 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3705 size, note->descpos + offset); 3706 } 3707 3708 static bool 3709 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 3710 { 3711 switch (note->descsz) 3712 { 3713 default: 3714 return false; 3715 3716 case 136: /* sizeof(struct elf_prpsinfo) on s390x */ 3717 elf_tdata (abfd)->core->pid 3718 = bfd_get_32 (abfd, note->descdata + 24); 3719 elf_tdata (abfd)->core->program 3720 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 3721 elf_tdata (abfd)->core->command 3722 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 3723 } 3724 3725 /* Note that for some reason, a spurious space is tacked 3726 onto the end of the args in some (at least one anyway) 3727 implementations, so strip it off if it exists. */ 3728 3729 { 3730 char *command = elf_tdata (abfd)->core->command; 3731 int n = strlen (command); 3732 3733 if (0 < n && command[n - 1] == ' ') 3734 command[n - 1] = '\0'; 3735 } 3736 3737 return true; 3738 } 3739 3740 static char * 3741 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz, 3742 int note_type, ...) 3743 { 3744 va_list ap; 3745 3746 switch (note_type) 3747 { 3748 default: 3749 return NULL; 3750 3751 case NT_PRPSINFO: 3752 { 3753 char data[136] ATTRIBUTE_NONSTRING = { 0 }; 3754 const char *fname, *psargs; 3755 3756 va_start (ap, note_type); 3757 fname = va_arg (ap, const char *); 3758 psargs = va_arg (ap, const char *); 3759 va_end (ap); 3760 3761 strncpy (data + 40, fname, 16); 3762 #if GCC_VERSION == 8000 || GCC_VERSION == 8001 3763 DIAGNOSTIC_PUSH; 3764 /* GCC 8.0 and 8.1 warn about 80 equals destination size with 3765 -Wstringop-truncation: 3766 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643 3767 */ 3768 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION; 3769 #endif 3770 strncpy (data + 56, psargs, 80); 3771 #if GCC_VERSION == 8000 || GCC_VERSION == 8001 3772 DIAGNOSTIC_POP; 3773 #endif 3774 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3775 &data, sizeof (data)); 3776 } 3777 3778 case NT_PRSTATUS: 3779 { 3780 char data[336] = { 0 }; 3781 long pid; 3782 int cursig; 3783 const void *gregs; 3784 3785 va_start (ap, note_type); 3786 pid = va_arg (ap, long); 3787 cursig = va_arg (ap, int); 3788 gregs = va_arg (ap, const void *); 3789 va_end (ap); 3790 3791 bfd_put_16 (abfd, cursig, data + 12); 3792 bfd_put_32 (abfd, pid, data + 32); 3793 memcpy (data + 112, gregs, 216); 3794 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3795 &data, sizeof (data)); 3796 } 3797 } 3798 /* NOTREACHED */ 3799 } 3800 3801 /* Return address for Ith PLT stub in section PLT, for relocation REL 3803 or (bfd_vma) -1 if it should not be included. */ 3804 3805 static bfd_vma 3806 elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3807 const arelent *rel ATTRIBUTE_UNUSED) 3808 { 3809 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3810 } 3811 3812 /* Merge backend specific data from an object file to the output 3813 object file when linking. */ 3814 3815 static bool 3816 elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 3817 { 3818 if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd)) 3819 return true; 3820 3821 return elf_s390_merge_obj_attributes (ibfd, info); 3822 } 3823 3824 /* We may add a PT_S390_PGSTE program header. */ 3825 3826 static int 3827 elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED, 3828 struct bfd_link_info *info) 3829 { 3830 struct elf_s390_link_hash_table *htab; 3831 3832 if (info) 3833 { 3834 htab = elf_s390_hash_table (info); 3835 if (htab) 3836 return htab->params->pgste; 3837 } 3838 return 0; 3839 } 3840 3841 3842 /* Add the PT_S390_PGSTE program header. */ 3843 3844 static bool 3845 elf_s390_modify_segment_map (bfd *abfd, struct bfd_link_info *info) 3846 { 3847 struct elf_s390_link_hash_table *htab; 3848 struct elf_segment_map *m, *pm = NULL; 3849 3850 if (!abfd || !info) 3851 return true; 3852 3853 htab = elf_s390_hash_table (info); 3854 if (!htab || !htab->params->pgste) 3855 return true; 3856 3857 /* If there is already a PT_S390_PGSTE header, avoid adding 3858 another. */ 3859 m = elf_seg_map (abfd); 3860 while (m && m->p_type != PT_S390_PGSTE) 3861 { 3862 pm = m; 3863 m = m->next; 3864 } 3865 3866 if (m) 3867 return true; 3868 3869 m = (struct elf_segment_map *) 3870 bfd_zalloc (abfd, sizeof (struct elf_segment_map)); 3871 if (m == NULL) 3872 return false; 3873 m->p_type = PT_S390_PGSTE; 3874 m->count = 0; 3875 m->next = NULL; 3876 if (pm) 3877 pm->next = m; 3878 3879 return true; 3880 } 3881 3882 bool 3883 bfd_elf_s390_set_options (struct bfd_link_info *info, 3884 struct s390_elf_params *params) 3885 { 3886 struct elf_s390_link_hash_table *htab; 3887 3888 if (info) 3889 { 3890 htab = elf_s390_hash_table (info); 3891 if (htab) 3892 htab->params = params; 3893 } 3894 3895 return true; 3896 } 3897 3898 3899 /* Why was the hash table entry size definition changed from 3900 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and 3901 this is the only reason for the s390_elf64_size_info structure. */ 3902 3903 const struct elf_size_info s390_elf64_size_info = 3904 { 3905 sizeof (Elf64_External_Ehdr), 3906 sizeof (Elf64_External_Phdr), 3907 sizeof (Elf64_External_Shdr), 3908 sizeof (Elf64_External_Rel), 3909 sizeof (Elf64_External_Rela), 3910 sizeof (Elf64_External_Sym), 3911 sizeof (Elf64_External_Dyn), 3912 sizeof (Elf_External_Note), 3913 8, /* hash-table entry size. */ 3914 1, /* internal relocations per external relocations. */ 3915 64, /* arch_size. */ 3916 3, /* log_file_align. */ 3917 ELFCLASS64, EV_CURRENT, 3918 bfd_elf64_write_out_phdrs, 3919 bfd_elf64_write_shdrs_and_ehdr, 3920 bfd_elf64_checksum_contents, 3921 bfd_elf64_write_relocs, 3922 bfd_elf64_swap_symbol_in, 3923 bfd_elf64_swap_symbol_out, 3924 bfd_elf64_slurp_reloc_table, 3925 bfd_elf64_slurp_symbol_table, 3926 bfd_elf64_swap_dyn_in, 3927 bfd_elf64_swap_dyn_out, 3928 bfd_elf64_swap_reloc_in, 3929 bfd_elf64_swap_reloc_out, 3930 bfd_elf64_swap_reloca_in, 3931 bfd_elf64_swap_reloca_out 3932 }; 3933 3934 #define TARGET_BIG_SYM s390_elf64_vec 3935 #define TARGET_BIG_NAME "elf64-s390" 3936 #define ELF_ARCH bfd_arch_s390 3937 #define ELF_TARGET_ID S390_ELF_DATA 3938 #define ELF_MACHINE_CODE EM_S390 3939 #define ELF_MACHINE_ALT1 EM_S390_OLD 3940 #define ELF_MAXPAGESIZE 0x1000 3941 3942 #define elf_backend_size_info s390_elf64_size_info 3943 3944 #define elf_backend_can_gc_sections 1 3945 #define elf_backend_can_refcount 1 3946 #define elf_backend_want_got_plt 1 3947 #define elf_backend_plt_readonly 1 3948 #define elf_backend_want_plt_sym 0 3949 #define elf_backend_got_header_size 24 3950 #define elf_backend_want_dynrelro 1 3951 #define elf_backend_rela_normal 1 3952 3953 #define elf_info_to_howto elf_s390_info_to_howto 3954 3955 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name 3956 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create 3957 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 3958 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 3959 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data 3960 3961 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 3962 #define elf_backend_check_relocs elf_s390_check_relocs 3963 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 3964 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 3965 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 3966 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 3967 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 3968 #define elf_backend_reloc_type_class elf_s390_reloc_type_class 3969 #define elf_backend_relocate_section elf_s390_relocate_section 3970 #define elf_backend_late_size_sections elf_s390_late_size_sections 3971 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 3972 #define elf_backend_grok_prstatus elf_s390_grok_prstatus 3973 #define elf_backend_grok_psinfo elf_s390_grok_psinfo 3974 #define elf_backend_write_core_note elf_s390_write_core_note 3975 #define elf_backend_plt_sym_val elf_s390_plt_sym_val 3976 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p 3977 #define elf_backend_additional_program_headers elf_s390_additional_program_headers 3978 #define elf_backend_modify_segment_map elf_s390_modify_segment_map 3979 3980 #define bfd_elf64_mkobject elf_s390_mkobject 3981 #define elf_backend_object_p elf_s390_object_p 3982 3983 #include "elf64-target.h" 3984
Indexes created Mon Apr 27 00:23:16 UTC 2026