elf64-s390.c revision 1.7
1 /* IBM S/390-specific support for 64-bit ELF 2 Copyright (C) 2000-2017 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 <stdarg.h> 29 30 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value 31 from smaller values. Start with zero, widen, *then* decrement. */ 32 #define MINUS_ONE (((bfd_vma)0) - 1) 33 34 static bfd_reloc_status_type 35 s390_tls_reloc (bfd *, arelent *, asymbol *, void *, 36 asection *, bfd *, char **); 37 static bfd_reloc_status_type 38 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *, 39 asection *, bfd *, char **); 40 41 /* The relocation "howto" table. */ 42 static reloc_howto_type elf_howto_table[] = 43 { 44 HOWTO (R_390_NONE, /* type */ 45 0, /* rightshift */ 46 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */ 47 0, /* bitsize */ 48 FALSE, /* pc_relative */ 49 0, /* bitpos */ 50 complain_overflow_dont, /* complain_on_overflow */ 51 bfd_elf_generic_reloc, /* special_function */ 52 "R_390_NONE", /* name */ 53 FALSE, /* partial_inplace */ 54 0, /* src_mask */ 55 0, /* dst_mask */ 56 FALSE), /* pcrel_offset */ 57 58 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 59 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 60 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 61 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 62 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 63 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 64 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 65 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 66 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 67 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 68 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 69 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 70 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 71 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 72 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 73 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 74 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 75 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE), 76 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 77 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE), 78 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 79 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE), 80 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 81 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE), 82 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 83 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE), 84 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 85 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE), 86 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 87 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 88 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 89 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 90 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 91 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 92 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 93 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 94 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 95 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 96 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 97 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 98 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 99 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE), 100 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 101 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE), 102 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 103 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE), 104 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 105 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE), 106 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 107 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE), 108 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 109 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE), 110 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 111 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 112 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 113 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE), 114 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 115 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 116 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 118 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 119 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 120 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 121 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE), 122 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 123 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE), 124 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 125 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 126 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 128 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 129 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE), 130 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 131 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 132 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 133 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 134 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 135 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 136 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */ 137 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 138 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE), 139 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 140 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 141 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */ 142 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 143 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE), 144 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */ 145 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 146 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE), 147 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */ 148 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 149 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE), 150 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 151 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE), 152 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */ 153 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 154 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE), 155 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */ 156 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 157 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE), 158 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 159 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE), 160 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 161 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE), 162 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 163 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE), 164 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 165 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 166 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 167 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 168 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 169 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 170 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 171 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 172 HOWTO(R_390_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 173 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, MINUS_ONE, FALSE), 174 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 175 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE), 176 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 177 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE), 178 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 179 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE), 180 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 181 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE), 182 }; 183 184 /* GNU extension to record C++ vtable hierarchy. */ 185 static reloc_howto_type elf64_s390_vtinherit_howto = 186 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 187 static reloc_howto_type elf64_s390_vtentry_howto = 188 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE); 189 190 static reloc_howto_type * 191 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 192 bfd_reloc_code_real_type code) 193 { 194 switch (code) 195 { 196 case BFD_RELOC_NONE: 197 return &elf_howto_table[(int) R_390_NONE]; 198 case BFD_RELOC_8: 199 return &elf_howto_table[(int) R_390_8]; 200 case BFD_RELOC_390_12: 201 return &elf_howto_table[(int) R_390_12]; 202 case BFD_RELOC_16: 203 return &elf_howto_table[(int) R_390_16]; 204 case BFD_RELOC_32: 205 return &elf_howto_table[(int) R_390_32]; 206 case BFD_RELOC_CTOR: 207 return &elf_howto_table[(int) R_390_32]; 208 case BFD_RELOC_32_PCREL: 209 return &elf_howto_table[(int) R_390_PC32]; 210 case BFD_RELOC_390_GOT12: 211 return &elf_howto_table[(int) R_390_GOT12]; 212 case BFD_RELOC_32_GOT_PCREL: 213 return &elf_howto_table[(int) R_390_GOT32]; 214 case BFD_RELOC_390_PLT32: 215 return &elf_howto_table[(int) R_390_PLT32]; 216 case BFD_RELOC_390_COPY: 217 return &elf_howto_table[(int) R_390_COPY]; 218 case BFD_RELOC_390_GLOB_DAT: 219 return &elf_howto_table[(int) R_390_GLOB_DAT]; 220 case BFD_RELOC_390_JMP_SLOT: 221 return &elf_howto_table[(int) R_390_JMP_SLOT]; 222 case BFD_RELOC_390_RELATIVE: 223 return &elf_howto_table[(int) R_390_RELATIVE]; 224 case BFD_RELOC_32_GOTOFF: 225 return &elf_howto_table[(int) R_390_GOTOFF32]; 226 case BFD_RELOC_390_GOTPC: 227 return &elf_howto_table[(int) R_390_GOTPC]; 228 case BFD_RELOC_390_GOT16: 229 return &elf_howto_table[(int) R_390_GOT16]; 230 case BFD_RELOC_16_PCREL: 231 return &elf_howto_table[(int) R_390_PC16]; 232 case BFD_RELOC_390_PC12DBL: 233 return &elf_howto_table[(int) R_390_PC12DBL]; 234 case BFD_RELOC_390_PLT12DBL: 235 return &elf_howto_table[(int) R_390_PLT12DBL]; 236 case BFD_RELOC_390_PC16DBL: 237 return &elf_howto_table[(int) R_390_PC16DBL]; 238 case BFD_RELOC_390_PLT16DBL: 239 return &elf_howto_table[(int) R_390_PLT16DBL]; 240 case BFD_RELOC_390_PC24DBL: 241 return &elf_howto_table[(int) R_390_PC24DBL]; 242 case BFD_RELOC_390_PLT24DBL: 243 return &elf_howto_table[(int) R_390_PLT24DBL]; 244 case BFD_RELOC_390_PC32DBL: 245 return &elf_howto_table[(int) R_390_PC32DBL]; 246 case BFD_RELOC_390_PLT32DBL: 247 return &elf_howto_table[(int) R_390_PLT32DBL]; 248 case BFD_RELOC_390_GOTPCDBL: 249 return &elf_howto_table[(int) R_390_GOTPCDBL]; 250 case BFD_RELOC_64: 251 return &elf_howto_table[(int) R_390_64]; 252 case BFD_RELOC_64_PCREL: 253 return &elf_howto_table[(int) R_390_PC64]; 254 case BFD_RELOC_390_GOT64: 255 return &elf_howto_table[(int) R_390_GOT64]; 256 case BFD_RELOC_390_PLT64: 257 return &elf_howto_table[(int) R_390_PLT64]; 258 case BFD_RELOC_390_GOTENT: 259 return &elf_howto_table[(int) R_390_GOTENT]; 260 case BFD_RELOC_16_GOTOFF: 261 return &elf_howto_table[(int) R_390_GOTOFF16]; 262 case BFD_RELOC_390_GOTOFF64: 263 return &elf_howto_table[(int) R_390_GOTOFF64]; 264 case BFD_RELOC_390_GOTPLT12: 265 return &elf_howto_table[(int) R_390_GOTPLT12]; 266 case BFD_RELOC_390_GOTPLT16: 267 return &elf_howto_table[(int) R_390_GOTPLT16]; 268 case BFD_RELOC_390_GOTPLT32: 269 return &elf_howto_table[(int) R_390_GOTPLT32]; 270 case BFD_RELOC_390_GOTPLT64: 271 return &elf_howto_table[(int) R_390_GOTPLT64]; 272 case BFD_RELOC_390_GOTPLTENT: 273 return &elf_howto_table[(int) R_390_GOTPLTENT]; 274 case BFD_RELOC_390_PLTOFF16: 275 return &elf_howto_table[(int) R_390_PLTOFF16]; 276 case BFD_RELOC_390_PLTOFF32: 277 return &elf_howto_table[(int) R_390_PLTOFF32]; 278 case BFD_RELOC_390_PLTOFF64: 279 return &elf_howto_table[(int) R_390_PLTOFF64]; 280 case BFD_RELOC_390_TLS_LOAD: 281 return &elf_howto_table[(int) R_390_TLS_LOAD]; 282 case BFD_RELOC_390_TLS_GDCALL: 283 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 284 case BFD_RELOC_390_TLS_LDCALL: 285 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 286 case BFD_RELOC_390_TLS_GD64: 287 return &elf_howto_table[(int) R_390_TLS_GD64]; 288 case BFD_RELOC_390_TLS_GOTIE12: 289 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 290 case BFD_RELOC_390_TLS_GOTIE64: 291 return &elf_howto_table[(int) R_390_TLS_GOTIE64]; 292 case BFD_RELOC_390_TLS_LDM64: 293 return &elf_howto_table[(int) R_390_TLS_LDM64]; 294 case BFD_RELOC_390_TLS_IE64: 295 return &elf_howto_table[(int) R_390_TLS_IE64]; 296 case BFD_RELOC_390_TLS_IEENT: 297 return &elf_howto_table[(int) R_390_TLS_IEENT]; 298 case BFD_RELOC_390_TLS_LE64: 299 return &elf_howto_table[(int) R_390_TLS_LE64]; 300 case BFD_RELOC_390_TLS_LDO64: 301 return &elf_howto_table[(int) R_390_TLS_LDO64]; 302 case BFD_RELOC_390_TLS_DTPMOD: 303 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 304 case BFD_RELOC_390_TLS_DTPOFF: 305 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 306 case BFD_RELOC_390_TLS_TPOFF: 307 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 308 case BFD_RELOC_390_20: 309 return &elf_howto_table[(int) R_390_20]; 310 case BFD_RELOC_390_GOT20: 311 return &elf_howto_table[(int) R_390_GOT20]; 312 case BFD_RELOC_390_GOTPLT20: 313 return &elf_howto_table[(int) R_390_GOTPLT20]; 314 case BFD_RELOC_390_TLS_GOTIE20: 315 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 316 case BFD_RELOC_390_IRELATIVE: 317 return &elf_howto_table[(int) R_390_IRELATIVE]; 318 case BFD_RELOC_VTABLE_INHERIT: 319 return &elf64_s390_vtinherit_howto; 320 case BFD_RELOC_VTABLE_ENTRY: 321 return &elf64_s390_vtentry_howto; 322 default: 323 break; 324 } 325 return 0; 326 } 327 328 static reloc_howto_type * 329 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 330 const char *r_name) 331 { 332 unsigned int i; 333 334 for (i = 0; 335 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); 336 i++) 337 if (elf_howto_table[i].name != NULL 338 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 339 return &elf_howto_table[i]; 340 341 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0) 342 return &elf64_s390_vtinherit_howto; 343 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0) 344 return &elf64_s390_vtentry_howto; 345 346 return NULL; 347 } 348 349 /* We need to use ELF64_R_TYPE so we have our own copy of this function, 350 and elf64-s390.c has its own copy. */ 351 352 static void 353 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 354 arelent *cache_ptr, 355 Elf_Internal_Rela *dst) 356 { 357 unsigned int r_type = ELF64_R_TYPE(dst->r_info); 358 switch (r_type) 359 { 360 case R_390_GNU_VTINHERIT: 361 cache_ptr->howto = &elf64_s390_vtinherit_howto; 362 break; 363 364 case R_390_GNU_VTENTRY: 365 cache_ptr->howto = &elf64_s390_vtentry_howto; 366 break; 367 368 default: 369 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 370 { 371 /* xgettext:c-format */ 372 _bfd_error_handler (_("%B: invalid relocation type %d"), 373 abfd, (int) r_type); 374 r_type = R_390_NONE; 375 } 376 cache_ptr->howto = &elf_howto_table[r_type]; 377 } 378 } 379 380 /* A relocation function which doesn't do anything. */ 381 static bfd_reloc_status_type 382 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED, 383 arelent *reloc_entry, 384 asymbol *symbol ATTRIBUTE_UNUSED, 385 void * data ATTRIBUTE_UNUSED, 386 asection *input_section, 387 bfd *output_bfd, 388 char **error_message ATTRIBUTE_UNUSED) 389 { 390 if (output_bfd) 391 reloc_entry->address += input_section->output_offset; 392 return bfd_reloc_ok; 393 } 394 395 /* Handle the large displacement relocs. */ 396 static bfd_reloc_status_type 397 s390_elf_ldisp_reloc (bfd *abfd, 398 arelent *reloc_entry, 399 asymbol *symbol, 400 void * data, 401 asection *input_section, 402 bfd *output_bfd, 403 char **error_message ATTRIBUTE_UNUSED) 404 { 405 reloc_howto_type *howto = reloc_entry->howto; 406 bfd_vma relocation; 407 bfd_vma insn; 408 409 if (output_bfd != (bfd *) NULL 410 && (symbol->flags & BSF_SECTION_SYM) == 0 411 && (! howto->partial_inplace 412 || reloc_entry->addend == 0)) 413 { 414 reloc_entry->address += input_section->output_offset; 415 return bfd_reloc_ok; 416 } 417 if (output_bfd != NULL) 418 return bfd_reloc_continue; 419 420 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 421 return bfd_reloc_outofrange; 422 423 relocation = (symbol->value 424 + symbol->section->output_section->vma 425 + symbol->section->output_offset); 426 relocation += reloc_entry->addend; 427 if (howto->pc_relative) 428 { 429 relocation -= (input_section->output_section->vma 430 + input_section->output_offset); 431 relocation -= reloc_entry->address; 432 } 433 434 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 435 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 436 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 437 438 if ((bfd_signed_vma) relocation < - 0x80000 439 || (bfd_signed_vma) relocation > 0x7ffff) 440 return bfd_reloc_overflow; 441 else 442 return bfd_reloc_ok; 443 } 444 445 static bfd_boolean 446 elf_s390_is_local_label_name (bfd *abfd, const char *name) 447 { 448 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 449 return TRUE; 450 451 return _bfd_elf_is_local_label_name (abfd, name); 452 } 453 454 /* Functions for the 390 ELF linker. */ 455 456 /* The name of the dynamic interpreter. This is put in the .interp 457 section. */ 458 459 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" 460 461 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 462 copying dynamic variables from a shared lib into an app's dynbss 463 section, and instead use a dynamic relocation to point into the 464 shared lib. */ 465 #define ELIMINATE_COPY_RELOCS 1 466 467 /* The size in bytes of the first entry in the procedure linkage table. */ 468 #define PLT_FIRST_ENTRY_SIZE 32 469 /* The size in bytes of an entry in the procedure linkage table. */ 470 #define PLT_ENTRY_SIZE 32 471 472 #define GOT_ENTRY_SIZE 8 473 474 #define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela) 475 476 /* The first three entries in a procedure linkage table are reserved, 477 and the initial contents are unimportant (we zero them out). 478 Subsequent entries look like this. See the SVR4 ABI 386 479 supplement to see how this works. */ 480 481 /* For the s390, simple addr offset can only be 0 - 4096. 482 To use the full 16777216 TB address space, several instructions 483 are needed to load an address in a register and execute 484 a branch( or just saving the address) 485 486 Furthermore, only r 0 and 1 are free to use!!! */ 487 488 /* The first 3 words in the GOT are then reserved. 489 Word 0 is the address of the dynamic table. 490 Word 1 is a pointer to a structure describing the object 491 Word 2 is used to point to the loader entry address. 492 493 The code for PLT entries looks like this: 494 495 The GOT holds the address in the PLT to be executed. 496 The loader then gets: 497 48(15) = Pointer to the structure describing the object. 498 56(15) = Offset in symbol table 499 The loader must then find the module where the function is 500 and insert the address in the GOT. 501 502 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1 503 LG 1,0(1) # 6 bytes Load address from GOT in r1 504 BCR 15,1 # 2 bytes Jump to address 505 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 506 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1 507 BRCL 15,-x # 6 bytes Jump to start of PLT 508 .long ? # 4 bytes offset into .rela.plt 509 510 Total = 32 bytes per PLT entry 511 Fixup at offset 2: relative address to GOT entry 512 Fixup at offset 22: relative branch to PLT0 513 Fixup at offset 28: 32 bit offset into .rela.plt 514 515 A 32 bit offset into the symbol table is enough. It allows for 516 .rela.plt sections up to a size of 2 gigabyte. A single dynamic 517 object (the main program, any shared library) is limited to 4GB in 518 size. Having a .rela.plt of 2GB would already make the .plt 519 section bigger than 8GB. */ 520 521 static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] = 522 { 523 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */ 524 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, /* lg %r1,0(%r1) */ 525 0x07, 0xf1, /* br %r1 */ 526 0x0d, 0x10, /* basr %r1,%r0 */ 527 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, /* lgf %r1,12(%r1) */ 528 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, /* jg first plt */ 529 0x00, 0x00, 0x00, 0x00 /* .long 0x00000000 */ 530 }; 531 532 /* The first PLT entry pushes the offset into the symbol table 533 from R1 onto the stack at 56(15) and the loader object info 534 at 48(15), loads the loader address in R1 and jumps to it. */ 535 536 /* The first entry in the PLT: 537 538 PLT0: 539 STG 1,56(15) # r1 contains the offset into the symbol table 540 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table 541 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack 542 LG 1,16(1) # get entry address of loader 543 BCR 15,1 # jump to loader 544 545 Fixup at offset 8: relative address to start of GOT. */ 546 547 static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] = 548 { 549 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, /* stg %r1,56(%r15) */ 550 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, /* larl %r1,. */ 551 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, /* mvc 48(8,%r15),8(%r1) */ 552 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, /* lg %r1,16(%r1) */ 553 0x07, 0xf1, /* br %r1 */ 554 0x07, 0x00, /* nopr %r0 */ 555 0x07, 0x00, /* nopr %r0 */ 556 0x07, 0x00 /* nopr %r0 */ 557 }; 558 559 560 /* s390 ELF linker hash entry. */ 561 562 struct elf_s390_link_hash_entry 563 { 564 struct elf_link_hash_entry elf; 565 566 /* Track dynamic relocs copied for this symbol. */ 567 struct elf_dyn_relocs *dyn_relocs; 568 569 /* Number of GOTPLT references for a function. */ 570 bfd_signed_vma gotplt_refcount; 571 572 #define GOT_UNKNOWN 0 573 #define GOT_NORMAL 1 574 #define GOT_TLS_GD 2 575 #define GOT_TLS_IE 3 576 #define GOT_TLS_IE_NLT 3 577 unsigned char tls_type; 578 579 /* For pointer equality reasons we might need to change the symbol 580 type from STT_GNU_IFUNC to STT_FUNC together with its value and 581 section entry. So after alloc_dynrelocs only these values should 582 be used. In order to check whether a symbol is IFUNC use 583 s390_is_ifunc_symbol_p. */ 584 bfd_vma ifunc_resolver_address; 585 asection *ifunc_resolver_section; 586 }; 587 588 #define elf_s390_hash_entry(ent) \ 589 ((struct elf_s390_link_hash_entry *)(ent)) 590 591 /* This structure represents an entry in the local PLT list needed for 592 local IFUNC symbols. */ 593 struct plt_entry 594 { 595 /* The section of the local symbol. 596 Set in relocate_section and used in finish_dynamic_sections. */ 597 asection *sec; 598 599 union 600 { 601 bfd_signed_vma refcount; 602 bfd_vma offset; 603 } plt; 604 }; 605 606 /* NOTE: Keep this structure in sync with 607 the one declared in elf32-s390.c. */ 608 struct elf_s390_obj_tdata 609 { 610 struct elf_obj_tdata root; 611 612 /* A local PLT is needed for ifunc symbols. */ 613 struct plt_entry *local_plt; 614 615 /* TLS type for each local got entry. */ 616 char *local_got_tls_type; 617 }; 618 619 #define elf_s390_tdata(abfd) \ 620 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 621 622 #define elf_s390_local_plt(abfd) \ 623 (elf_s390_tdata (abfd)->local_plt) 624 625 #define elf_s390_local_got_tls_type(abfd) \ 626 (elf_s390_tdata (abfd)->local_got_tls_type) 627 628 #define is_s390_elf(bfd) \ 629 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 630 && elf_tdata (bfd) != NULL \ 631 && elf_object_id (bfd) == S390_ELF_DATA) 632 633 static bfd_boolean 634 elf_s390_mkobject (bfd *abfd) 635 { 636 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata), 637 S390_ELF_DATA); 638 } 639 640 static bfd_boolean 641 elf_s390_object_p (bfd *abfd) 642 { 643 /* Set the right machine number for an s390 elf32 file. */ 644 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64); 645 } 646 647 /* s390 ELF linker hash table. */ 648 649 struct elf_s390_link_hash_table 650 { 651 struct elf_link_hash_table elf; 652 653 /* Short-cuts to get to dynamic linker sections. */ 654 asection *irelifunc; 655 656 union { 657 bfd_signed_vma refcount; 658 bfd_vma offset; 659 } tls_ldm_got; 660 661 /* Small local sym cache. */ 662 struct sym_cache sym_cache; 663 }; 664 665 /* Get the s390 ELF linker hash table from a link_info structure. */ 666 667 #define elf_s390_hash_table(p) \ 668 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 669 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL) 670 671 #define ELF64 1 672 #include "elf-s390-common.c" 673 674 /* Create an entry in an s390 ELF linker hash table. */ 675 676 static struct bfd_hash_entry * 677 link_hash_newfunc (struct bfd_hash_entry *entry, 678 struct bfd_hash_table *table, 679 const char *string) 680 { 681 /* Allocate the structure if it has not already been allocated by a 682 subclass. */ 683 if (entry == NULL) 684 { 685 entry = bfd_hash_allocate (table, 686 sizeof (struct elf_s390_link_hash_entry)); 687 if (entry == NULL) 688 return entry; 689 } 690 691 /* Call the allocation method of the superclass. */ 692 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 693 if (entry != NULL) 694 { 695 struct elf_s390_link_hash_entry *eh; 696 697 eh = (struct elf_s390_link_hash_entry *) entry; 698 eh->dyn_relocs = NULL; 699 eh->gotplt_refcount = 0; 700 eh->tls_type = GOT_UNKNOWN; 701 eh->ifunc_resolver_address = 0; 702 eh->ifunc_resolver_section = NULL; 703 } 704 705 return entry; 706 } 707 708 /* Create an s390 ELF linker hash table. */ 709 710 static struct bfd_link_hash_table * 711 elf_s390_link_hash_table_create (bfd *abfd) 712 { 713 struct elf_s390_link_hash_table *ret; 714 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 715 716 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt); 717 if (ret == NULL) 718 return NULL; 719 720 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 721 sizeof (struct elf_s390_link_hash_entry), 722 S390_ELF_DATA)) 723 { 724 free (ret); 725 return NULL; 726 } 727 728 return &ret->elf.root; 729 } 730 731 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 732 733 static void 734 elf_s390_copy_indirect_symbol (struct bfd_link_info *info, 735 struct elf_link_hash_entry *dir, 736 struct elf_link_hash_entry *ind) 737 { 738 struct elf_s390_link_hash_entry *edir, *eind; 739 740 edir = (struct elf_s390_link_hash_entry *) dir; 741 eind = (struct elf_s390_link_hash_entry *) ind; 742 743 if (eind->dyn_relocs != NULL) 744 { 745 if (edir->dyn_relocs != NULL) 746 { 747 struct elf_dyn_relocs **pp; 748 struct elf_dyn_relocs *p; 749 750 /* Add reloc counts against the indirect sym to the direct sym 751 list. Merge any entries against the same section. */ 752 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 753 { 754 struct elf_dyn_relocs *q; 755 756 for (q = edir->dyn_relocs; q != NULL; q = q->next) 757 if (q->sec == p->sec) 758 { 759 q->pc_count += p->pc_count; 760 q->count += p->count; 761 *pp = p->next; 762 break; 763 } 764 if (q == NULL) 765 pp = &p->next; 766 } 767 *pp = edir->dyn_relocs; 768 } 769 770 edir->dyn_relocs = eind->dyn_relocs; 771 eind->dyn_relocs = NULL; 772 } 773 774 if (ind->root.type == bfd_link_hash_indirect 775 && dir->got.refcount <= 0) 776 { 777 edir->tls_type = eind->tls_type; 778 eind->tls_type = GOT_UNKNOWN; 779 } 780 781 if (ELIMINATE_COPY_RELOCS 782 && ind->root.type != bfd_link_hash_indirect 783 && dir->dynamic_adjusted) 784 { 785 /* If called to transfer flags for a weakdef during processing 786 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 787 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 788 if (dir->versioned != versioned_hidden) 789 dir->ref_dynamic |= ind->ref_dynamic; 790 dir->ref_regular |= ind->ref_regular; 791 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 792 dir->needs_plt |= ind->needs_plt; 793 } 794 else 795 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 796 } 797 798 static int 799 elf_s390_tls_transition (struct bfd_link_info *info, 800 int r_type, 801 int is_local) 802 { 803 if (bfd_link_pic (info)) 804 return r_type; 805 806 switch (r_type) 807 { 808 case R_390_TLS_GD64: 809 case R_390_TLS_IE64: 810 if (is_local) 811 return R_390_TLS_LE64; 812 return R_390_TLS_IE64; 813 case R_390_TLS_GOTIE64: 814 if (is_local) 815 return R_390_TLS_LE64; 816 return R_390_TLS_GOTIE64; 817 case R_390_TLS_LDM64: 818 return R_390_TLS_LE64; 819 } 820 821 return r_type; 822 } 823 824 /* Look through the relocs for a section during the first phase, and 825 allocate space in the global offset table or procedure linkage 826 table. */ 827 828 static bfd_boolean 829 elf_s390_check_relocs (bfd *abfd, 830 struct bfd_link_info *info, 831 asection *sec, 832 const Elf_Internal_Rela *relocs) 833 { 834 struct elf_s390_link_hash_table *htab; 835 Elf_Internal_Shdr *symtab_hdr; 836 struct elf_link_hash_entry **sym_hashes; 837 const Elf_Internal_Rela *rel; 838 const Elf_Internal_Rela *rel_end; 839 asection *sreloc; 840 bfd_signed_vma *local_got_refcounts; 841 int tls_type, old_tls_type; 842 843 if (bfd_link_relocatable (info)) 844 return TRUE; 845 846 BFD_ASSERT (is_s390_elf (abfd)); 847 848 htab = elf_s390_hash_table (info); 849 if (htab == NULL) 850 return FALSE; 851 852 symtab_hdr = &elf_symtab_hdr (abfd); 853 sym_hashes = elf_sym_hashes (abfd); 854 local_got_refcounts = elf_local_got_refcounts (abfd); 855 856 sreloc = NULL; 857 858 rel_end = relocs + sec->reloc_count; 859 for (rel = relocs; rel < rel_end; rel++) 860 { 861 unsigned int r_type; 862 unsigned long r_symndx; 863 struct elf_link_hash_entry *h; 864 Elf_Internal_Sym *isym; 865 866 r_symndx = ELF64_R_SYM (rel->r_info); 867 868 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 869 { 870 /* xgettext:c-format */ 871 _bfd_error_handler (_("%B: bad symbol index: %d"), 872 abfd, r_symndx); 873 return FALSE; 874 } 875 876 if (r_symndx < symtab_hdr->sh_info) 877 { 878 /* A local symbol. */ 879 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 880 abfd, r_symndx); 881 if (isym == NULL) 882 return FALSE; 883 884 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 885 { 886 struct plt_entry *plt; 887 888 if (htab->elf.dynobj == NULL) 889 htab->elf.dynobj = abfd; 890 891 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 892 return FALSE; 893 894 if (local_got_refcounts == NULL) 895 { 896 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 897 return FALSE; 898 local_got_refcounts = elf_local_got_refcounts (abfd); 899 } 900 plt = elf_s390_local_plt (abfd); 901 plt[r_symndx].plt.refcount++; 902 } 903 h = NULL; 904 } 905 else 906 { 907 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 908 while (h->root.type == bfd_link_hash_indirect 909 || h->root.type == bfd_link_hash_warning) 910 h = (struct elf_link_hash_entry *) h->root.u.i.link; 911 912 /* PR15323, ref flags aren't set for references in the same 913 object. */ 914 h->root.non_ir_ref = 1; 915 } 916 917 /* Create got section and local_got_refcounts array if they 918 are needed. */ 919 r_type = elf_s390_tls_transition (info, 920 ELF64_R_TYPE (rel->r_info), 921 h == NULL); 922 switch (r_type) 923 { 924 case R_390_GOT12: 925 case R_390_GOT16: 926 case R_390_GOT20: 927 case R_390_GOT32: 928 case R_390_GOT64: 929 case R_390_GOTENT: 930 case R_390_GOTPLT12: 931 case R_390_GOTPLT16: 932 case R_390_GOTPLT20: 933 case R_390_GOTPLT32: 934 case R_390_GOTPLT64: 935 case R_390_GOTPLTENT: 936 case R_390_TLS_GD64: 937 case R_390_TLS_GOTIE12: 938 case R_390_TLS_GOTIE20: 939 case R_390_TLS_GOTIE64: 940 case R_390_TLS_IEENT: 941 case R_390_TLS_IE64: 942 case R_390_TLS_LDM64: 943 if (h == NULL 944 && local_got_refcounts == NULL) 945 { 946 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 947 return FALSE; 948 local_got_refcounts = elf_local_got_refcounts (abfd); 949 } 950 951 /* Fall through. */ 952 case R_390_GOTOFF16: 953 case R_390_GOTOFF32: 954 case R_390_GOTOFF64: 955 case R_390_GOTPC: 956 case R_390_GOTPCDBL: 957 if (htab->elf.sgot == NULL) 958 { 959 if (htab->elf.dynobj == NULL) 960 htab->elf.dynobj = abfd; 961 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) 962 return FALSE; 963 } 964 } 965 966 if (h != NULL) 967 { 968 if (htab->elf.dynobj == NULL) 969 htab->elf.dynobj = abfd; 970 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 971 return FALSE; 972 973 /* Make sure an IFUNC symbol defined in a non-shared object 974 always gets a PLT slot. */ 975 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 976 { 977 /* The symbol is called by the dynamic loader in order 978 to resolve the relocation. So it is in fact also 979 referenced. */ 980 h->ref_regular = 1; 981 h->needs_plt = 1; 982 } 983 } 984 985 switch (r_type) 986 { 987 case R_390_GOTPC: 988 case R_390_GOTPCDBL: 989 /* These relocs do not need a GOT slot. They just load the 990 GOT pointer itself or address something else relative to 991 the GOT. Since the GOT pointer has been set up above we 992 are done. */ 993 break; 994 case R_390_GOTOFF16: 995 case R_390_GOTOFF32: 996 case R_390_GOTOFF64: 997 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular) 998 break; 999 /* Fall through. */ 1000 1001 case R_390_PLT12DBL: 1002 case R_390_PLT16DBL: 1003 case R_390_PLT24DBL: 1004 case R_390_PLT32: 1005 case R_390_PLT32DBL: 1006 case R_390_PLT64: 1007 case R_390_PLTOFF16: 1008 case R_390_PLTOFF32: 1009 case R_390_PLTOFF64: 1010 /* This symbol requires a procedure linkage table entry. We 1011 actually build the entry in adjust_dynamic_symbol, 1012 because this might be a case of linking PIC code which is 1013 never referenced by a dynamic object, in which case we 1014 don't need to generate a procedure linkage table entry 1015 after all. */ 1016 1017 /* If this is a local symbol, we resolve it directly without 1018 creating a procedure linkage table entry. */ 1019 if (h != NULL) 1020 { 1021 h->needs_plt = 1; 1022 h->plt.refcount += 1; 1023 } 1024 break; 1025 1026 case R_390_GOTPLT12: 1027 case R_390_GOTPLT16: 1028 case R_390_GOTPLT20: 1029 case R_390_GOTPLT32: 1030 case R_390_GOTPLT64: 1031 case R_390_GOTPLTENT: 1032 /* This symbol requires either a procedure linkage table entry 1033 or an entry in the local got. We actually build the entry 1034 in adjust_dynamic_symbol because whether this is really a 1035 global reference can change and with it the fact if we have 1036 to create a plt entry or a local got entry. To be able to 1037 make a once global symbol a local one we have to keep track 1038 of the number of gotplt references that exist for this 1039 symbol. */ 1040 if (h != NULL) 1041 { 1042 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1043 h->needs_plt = 1; 1044 h->plt.refcount += 1; 1045 } 1046 else 1047 local_got_refcounts[r_symndx] += 1; 1048 break; 1049 1050 case R_390_TLS_LDM64: 1051 htab->tls_ldm_got.refcount += 1; 1052 break; 1053 1054 case R_390_TLS_IE64: 1055 case R_390_TLS_GOTIE12: 1056 case R_390_TLS_GOTIE20: 1057 case R_390_TLS_GOTIE64: 1058 case R_390_TLS_IEENT: 1059 if (bfd_link_pic (info)) 1060 info->flags |= DF_STATIC_TLS; 1061 /* Fall through */ 1062 1063 case R_390_GOT12: 1064 case R_390_GOT16: 1065 case R_390_GOT20: 1066 case R_390_GOT32: 1067 case R_390_GOT64: 1068 case R_390_GOTENT: 1069 case R_390_TLS_GD64: 1070 /* This symbol requires a global offset table entry. */ 1071 switch (r_type) 1072 { 1073 default: 1074 case R_390_GOT12: 1075 case R_390_GOT16: 1076 case R_390_GOT20: 1077 case R_390_GOT32: 1078 case R_390_GOTENT: 1079 tls_type = GOT_NORMAL; 1080 break; 1081 case R_390_TLS_GD64: 1082 tls_type = GOT_TLS_GD; 1083 break; 1084 case R_390_TLS_IE64: 1085 case R_390_TLS_GOTIE64: 1086 tls_type = GOT_TLS_IE; 1087 break; 1088 case R_390_TLS_GOTIE12: 1089 case R_390_TLS_GOTIE20: 1090 case R_390_TLS_IEENT: 1091 tls_type = GOT_TLS_IE_NLT; 1092 break; 1093 } 1094 1095 if (h != NULL) 1096 { 1097 h->got.refcount += 1; 1098 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1099 } 1100 else 1101 { 1102 local_got_refcounts[r_symndx] += 1; 1103 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1104 } 1105 /* If a TLS symbol is accessed using IE at least once, 1106 there is no point to use dynamic model for it. */ 1107 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1108 { 1109 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1110 { 1111 _bfd_error_handler 1112 /* xgettext:c-format */ 1113 (_("%B: `%s' accessed both as normal and thread local symbol"), 1114 abfd, h->root.root.string); 1115 return FALSE; 1116 } 1117 if (old_tls_type > tls_type) 1118 tls_type = old_tls_type; 1119 } 1120 1121 if (old_tls_type != tls_type) 1122 { 1123 if (h != NULL) 1124 elf_s390_hash_entry (h)->tls_type = tls_type; 1125 else 1126 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1127 } 1128 1129 if (r_type != R_390_TLS_IE64) 1130 break; 1131 /* Fall through */ 1132 1133 case R_390_TLS_LE64: 1134 /* For static linking and executables this reloc will be 1135 calculated at linktime otherwise a TLS_TPOFF runtime 1136 reloc will be generated. */ 1137 if (r_type == R_390_TLS_LE64 && bfd_link_pie (info)) 1138 break; 1139 1140 if (!bfd_link_pic (info)) 1141 break; 1142 info->flags |= DF_STATIC_TLS; 1143 /* Fall through */ 1144 1145 case R_390_8: 1146 case R_390_16: 1147 case R_390_32: 1148 case R_390_64: 1149 case R_390_PC12DBL: 1150 case R_390_PC16: 1151 case R_390_PC16DBL: 1152 case R_390_PC24DBL: 1153 case R_390_PC32: 1154 case R_390_PC32DBL: 1155 case R_390_PC64: 1156 if (h != NULL && bfd_link_executable (info)) 1157 { 1158 /* If this reloc is in a read-only section, we might 1159 need a copy reloc. We can't check reliably at this 1160 stage whether the section is read-only, as input 1161 sections have not yet been mapped to output sections. 1162 Tentatively set the flag for now, and correct in 1163 adjust_dynamic_symbol. */ 1164 h->non_got_ref = 1; 1165 1166 if (!bfd_link_pic (info)) 1167 { 1168 /* We may need a .plt entry if the function this reloc 1169 refers to is in a shared lib. */ 1170 h->plt.refcount += 1; 1171 } 1172 } 1173 1174 /* If we are creating a shared library, and this is a reloc 1175 against a global symbol, or a non PC relative reloc 1176 against a local symbol, then we need to copy the reloc 1177 into the shared library. However, if we are linking with 1178 -Bsymbolic, we do not need to copy a reloc against a 1179 global symbol which is defined in an object we are 1180 including in the link (i.e., DEF_REGULAR is set). At 1181 this point we have not seen all the input files, so it is 1182 possible that DEF_REGULAR is not set now but will be set 1183 later (it is never cleared). In case of a weak definition, 1184 DEF_REGULAR may be cleared later by a strong definition in 1185 a shared library. We account for that possibility below by 1186 storing information in the relocs_copied field of the hash 1187 table entry. A similar situation occurs when creating 1188 shared libraries and symbol visibility changes render the 1189 symbol local. 1190 1191 If on the other hand, we are creating an executable, we 1192 may need to keep relocations for symbols satisfied by a 1193 dynamic library if we manage to avoid copy relocs for the 1194 symbol. */ 1195 if ((bfd_link_pic (info) 1196 && (sec->flags & SEC_ALLOC) != 0 1197 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16 1198 && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL 1199 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL 1200 && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL 1201 && ELF64_R_TYPE (rel->r_info) != R_390_PC32 1202 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL 1203 && ELF64_R_TYPE (rel->r_info) != R_390_PC64) 1204 || (h != NULL 1205 && (! SYMBOLIC_BIND (info, h) 1206 || h->root.type == bfd_link_hash_defweak 1207 || !h->def_regular)))) 1208 || (ELIMINATE_COPY_RELOCS 1209 && !bfd_link_pic (info) 1210 && (sec->flags & SEC_ALLOC) != 0 1211 && h != NULL 1212 && (h->root.type == bfd_link_hash_defweak 1213 || !h->def_regular))) 1214 { 1215 struct elf_dyn_relocs *p; 1216 struct elf_dyn_relocs **head; 1217 1218 /* We must copy these reloc types into the output file. 1219 Create a reloc section in dynobj and make room for 1220 this reloc. */ 1221 if (sreloc == NULL) 1222 { 1223 if (htab->elf.dynobj == NULL) 1224 htab->elf.dynobj = abfd; 1225 1226 sreloc = _bfd_elf_make_dynamic_reloc_section 1227 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE); 1228 1229 if (sreloc == NULL) 1230 return FALSE; 1231 } 1232 1233 /* If this is a global symbol, we count the number of 1234 relocations we need for this symbol. */ 1235 if (h != NULL) 1236 { 1237 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1238 } 1239 else 1240 { 1241 /* Track dynamic relocs needed for local syms too. 1242 We really need local syms available to do this 1243 easily. Oh well. */ 1244 asection *s; 1245 void *vpp; 1246 1247 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1248 abfd, r_symndx); 1249 if (isym == NULL) 1250 return FALSE; 1251 1252 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1253 if (s == NULL) 1254 s = sec; 1255 1256 vpp = &elf_section_data (s)->local_dynrel; 1257 head = (struct elf_dyn_relocs **) vpp; 1258 } 1259 1260 p = *head; 1261 if (p == NULL || p->sec != sec) 1262 { 1263 bfd_size_type amt = sizeof *p; 1264 p = ((struct elf_dyn_relocs *) 1265 bfd_alloc (htab->elf.dynobj, amt)); 1266 if (p == NULL) 1267 return FALSE; 1268 p->next = *head; 1269 *head = p; 1270 p->sec = sec; 1271 p->count = 0; 1272 p->pc_count = 0; 1273 } 1274 1275 p->count += 1; 1276 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16 1277 || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL 1278 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1279 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL 1280 || ELF64_R_TYPE (rel->r_info) == R_390_PC32 1281 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL 1282 || ELF64_R_TYPE (rel->r_info) == R_390_PC64) 1283 p->pc_count += 1; 1284 } 1285 break; 1286 1287 /* This relocation describes the C++ object vtable hierarchy. 1288 Reconstruct it for later use during GC. */ 1289 case R_390_GNU_VTINHERIT: 1290 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1291 return FALSE; 1292 break; 1293 1294 /* This relocation describes which C++ vtable entries are actually 1295 used. Record for later use during GC. */ 1296 case R_390_GNU_VTENTRY: 1297 BFD_ASSERT (h != NULL); 1298 if (h != NULL 1299 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1300 return FALSE; 1301 break; 1302 1303 default: 1304 break; 1305 } 1306 } 1307 1308 return TRUE; 1309 } 1310 1311 /* Return the section that should be marked against GC for a given 1312 relocation. */ 1313 1314 static asection * 1315 elf_s390_gc_mark_hook (asection *sec, 1316 struct bfd_link_info *info, 1317 Elf_Internal_Rela *rel, 1318 struct elf_link_hash_entry *h, 1319 Elf_Internal_Sym *sym) 1320 { 1321 if (h != NULL) 1322 switch (ELF64_R_TYPE (rel->r_info)) 1323 { 1324 case R_390_GNU_VTINHERIT: 1325 case R_390_GNU_VTENTRY: 1326 return NULL; 1327 } 1328 1329 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1330 } 1331 1332 /* Update the got entry reference counts for the section being removed. */ 1333 1334 static bfd_boolean 1335 elf_s390_gc_sweep_hook (bfd *abfd, 1336 struct bfd_link_info *info, 1337 asection *sec, 1338 const Elf_Internal_Rela *relocs) 1339 { 1340 struct elf_s390_link_hash_table *htab; 1341 Elf_Internal_Shdr *symtab_hdr; 1342 struct elf_link_hash_entry **sym_hashes; 1343 bfd_signed_vma *local_got_refcounts; 1344 const Elf_Internal_Rela *rel, *relend; 1345 1346 if (bfd_link_relocatable (info)) 1347 return TRUE; 1348 1349 htab = elf_s390_hash_table (info); 1350 if (htab == NULL) 1351 return FALSE; 1352 1353 elf_section_data (sec)->local_dynrel = NULL; 1354 1355 symtab_hdr = &elf_symtab_hdr (abfd); 1356 sym_hashes = elf_sym_hashes (abfd); 1357 local_got_refcounts = elf_local_got_refcounts (abfd); 1358 1359 relend = relocs + sec->reloc_count; 1360 for (rel = relocs; rel < relend; rel++) 1361 { 1362 unsigned long r_symndx; 1363 unsigned int r_type; 1364 struct elf_link_hash_entry *h = NULL; 1365 1366 r_symndx = ELF64_R_SYM (rel->r_info); 1367 if (r_symndx >= symtab_hdr->sh_info) 1368 { 1369 struct elf_s390_link_hash_entry *eh; 1370 struct elf_dyn_relocs **pp; 1371 struct elf_dyn_relocs *p; 1372 1373 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1374 while (h->root.type == bfd_link_hash_indirect 1375 || h->root.type == bfd_link_hash_warning) 1376 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1377 eh = (struct elf_s390_link_hash_entry *) h; 1378 1379 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1380 if (p->sec == sec) 1381 { 1382 /* Everything must go for SEC. */ 1383 *pp = p->next; 1384 break; 1385 } 1386 } 1387 else 1388 { 1389 Elf_Internal_Sym *isym; 1390 1391 /* A local symbol. */ 1392 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1393 abfd, r_symndx); 1394 if (isym == NULL) 1395 return FALSE; 1396 1397 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1398 { 1399 struct plt_entry *plt = elf_s390_local_plt (abfd); 1400 if (plt[r_symndx].plt.refcount > 0) 1401 plt[r_symndx].plt.refcount--; 1402 } 1403 } 1404 1405 r_type = ELF64_R_TYPE (rel->r_info); 1406 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1407 switch (r_type) 1408 { 1409 case R_390_TLS_LDM64: 1410 if (htab->tls_ldm_got.refcount > 0) 1411 htab->tls_ldm_got.refcount -= 1; 1412 break; 1413 case R_390_GOTOFF16: 1414 case R_390_GOTOFF32: 1415 case R_390_GOTOFF64: 1416 if (h != NULL && s390_is_ifunc_symbol_p (h) && h->def_regular) 1417 { 1418 h->plt.refcount--; 1419 break; 1420 } 1421 1422 case R_390_GOTPC: 1423 case R_390_GOTPCDBL: 1424 break; 1425 1426 case R_390_TLS_GD64: 1427 case R_390_TLS_IE64: 1428 case R_390_TLS_GOTIE12: 1429 case R_390_TLS_GOTIE20: 1430 case R_390_TLS_GOTIE64: 1431 case R_390_TLS_IEENT: 1432 case R_390_GOT12: 1433 case R_390_GOT16: 1434 case R_390_GOT20: 1435 case R_390_GOT32: 1436 case R_390_GOT64: 1437 case R_390_GOTENT: 1438 if (h != NULL) 1439 { 1440 if (h->got.refcount > 0) 1441 h->got.refcount -= 1; 1442 } 1443 else if (local_got_refcounts != NULL) 1444 { 1445 if (local_got_refcounts[r_symndx] > 0) 1446 local_got_refcounts[r_symndx] -= 1; 1447 } 1448 break; 1449 1450 case R_390_8: 1451 case R_390_12: 1452 case R_390_16: 1453 case R_390_20: 1454 case R_390_32: 1455 case R_390_64: 1456 case R_390_PC16: 1457 case R_390_PC12DBL: 1458 case R_390_PC16DBL: 1459 case R_390_PC24DBL: 1460 case R_390_PC32: 1461 case R_390_PC32DBL: 1462 case R_390_PC64: 1463 if (bfd_link_pic (info)) 1464 break; 1465 /* Fall through */ 1466 1467 case R_390_PLT12DBL: 1468 case R_390_PLT16DBL: 1469 case R_390_PLT24DBL: 1470 case R_390_PLT32: 1471 case R_390_PLT32DBL: 1472 case R_390_PLT64: 1473 case R_390_PLTOFF16: 1474 case R_390_PLTOFF32: 1475 case R_390_PLTOFF64: 1476 if (h != NULL) 1477 { 1478 if (h->plt.refcount > 0) 1479 h->plt.refcount -= 1; 1480 } 1481 break; 1482 1483 case R_390_GOTPLT12: 1484 case R_390_GOTPLT16: 1485 case R_390_GOTPLT20: 1486 case R_390_GOTPLT32: 1487 case R_390_GOTPLT64: 1488 case R_390_GOTPLTENT: 1489 if (h != NULL) 1490 { 1491 if (h->plt.refcount > 0) 1492 { 1493 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1494 h->plt.refcount -= 1; 1495 } 1496 } 1497 else if (local_got_refcounts != NULL) 1498 { 1499 if (local_got_refcounts[r_symndx] > 0) 1500 local_got_refcounts[r_symndx] -= 1; 1501 } 1502 break; 1503 1504 default: 1505 break; 1506 } 1507 } 1508 1509 return TRUE; 1510 } 1511 1512 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1513 entry but we found we will not create any. Called when we find we will 1514 not have any PLT for this symbol, by for example 1515 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1516 or elf_s390_size_dynamic_sections if no dynamic sections will be 1517 created (we're only linking static objects). */ 1518 1519 static void 1520 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h) 1521 { 1522 if (h->elf.root.type == bfd_link_hash_warning) 1523 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1524 1525 if (h->gotplt_refcount <= 0) 1526 return; 1527 1528 /* We simply add the number of gotplt references to the number 1529 * of got references for this symbol. */ 1530 h->elf.got.refcount += h->gotplt_refcount; 1531 h->gotplt_refcount = -1; 1532 } 1533 1534 /* Adjust a symbol defined by a dynamic object and referenced by a 1535 regular object. The current definition is in some section of the 1536 dynamic object, but we're not including those sections. We have to 1537 change the definition to something the rest of the link can 1538 understand. */ 1539 1540 static bfd_boolean 1541 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info, 1542 struct elf_link_hash_entry *h) 1543 { 1544 struct elf_s390_link_hash_table *htab; 1545 asection *s, *srel; 1546 1547 /* STT_GNU_IFUNC symbol must go through PLT. */ 1548 if (s390_is_ifunc_symbol_p (h)) 1549 { 1550 /* All local STT_GNU_IFUNC references must be treated as local 1551 calls via local PLT. */ 1552 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h)) 1553 { 1554 bfd_size_type pc_count = 0, count = 0; 1555 struct elf_dyn_relocs **pp; 1556 struct elf_s390_link_hash_entry *eh; 1557 struct elf_dyn_relocs *p; 1558 1559 eh = (struct elf_s390_link_hash_entry *) h; 1560 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1561 { 1562 pc_count += p->pc_count; 1563 p->count -= p->pc_count; 1564 p->pc_count = 0; 1565 count += p->count; 1566 if (p->count == 0) 1567 *pp = p->next; 1568 else 1569 pp = &p->next; 1570 } 1571 1572 if (pc_count || count) 1573 { 1574 h->needs_plt = 1; 1575 h->non_got_ref = 1; 1576 if (h->plt.refcount <= 0) 1577 h->plt.refcount = 1; 1578 else 1579 h->plt.refcount += 1; 1580 } 1581 } 1582 1583 if (h->plt.refcount <= 0) 1584 { 1585 h->plt.offset = (bfd_vma) -1; 1586 h->needs_plt = 0; 1587 } 1588 return TRUE; 1589 } 1590 1591 /* If this is a function, put it in the procedure linkage table. We 1592 will fill in the contents of the procedure linkage table later 1593 (although we could actually do it here). */ 1594 if (h->type == STT_FUNC 1595 || h->needs_plt) 1596 { 1597 if (h->plt.refcount <= 0 1598 || SYMBOL_CALLS_LOCAL (info, h) 1599 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1600 && h->root.type == bfd_link_hash_undefweak)) 1601 { 1602 /* This case can occur if we saw a PLT32 reloc in an input 1603 file, but the symbol was never referred to by a dynamic 1604 object, or if all references were garbage collected. In 1605 such a case, we don't actually need to build a procedure 1606 linkage table, and we can just do a PC32 reloc instead. */ 1607 h->plt.offset = (bfd_vma) -1; 1608 h->needs_plt = 0; 1609 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1610 } 1611 1612 return TRUE; 1613 } 1614 else 1615 /* It's possible that we incorrectly decided a .plt reloc was 1616 needed for an R_390_PC32 reloc to a non-function sym in 1617 check_relocs. We can't decide accurately between function and 1618 non-function syms in check-relocs; Objects loaded later in 1619 the link may change h->type. So fix it now. */ 1620 h->plt.offset = (bfd_vma) -1; 1621 1622 /* If this is a weak symbol, and there is a real definition, the 1623 processor independent code will have arranged for us to see the 1624 real definition first, and we can just use the same value. */ 1625 if (h->u.weakdef != NULL) 1626 { 1627 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1628 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1629 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1630 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1631 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1632 h->non_got_ref = h->u.weakdef->non_got_ref; 1633 return TRUE; 1634 } 1635 1636 /* This is a reference to a symbol defined by a dynamic object which 1637 is not a function. */ 1638 1639 /* If we are creating a shared library, we must presume that the 1640 only references to the symbol are via the global offset table. 1641 For such cases we need not do anything here; the relocations will 1642 be handled correctly by relocate_section. */ 1643 if (bfd_link_pic (info)) 1644 return TRUE; 1645 1646 /* If there are no references to this symbol that do not use the 1647 GOT, we don't need to generate a copy reloc. */ 1648 if (!h->non_got_ref) 1649 return TRUE; 1650 1651 /* If -z nocopyreloc was given, we won't generate them either. */ 1652 if (info->nocopyreloc) 1653 { 1654 h->non_got_ref = 0; 1655 return TRUE; 1656 } 1657 1658 if (ELIMINATE_COPY_RELOCS) 1659 { 1660 struct elf_s390_link_hash_entry * eh; 1661 struct elf_dyn_relocs *p; 1662 1663 eh = (struct elf_s390_link_hash_entry *) h; 1664 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1665 { 1666 s = p->sec->output_section; 1667 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1668 break; 1669 } 1670 1671 /* If we didn't find any dynamic relocs in read-only sections, then 1672 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1673 if (p == NULL) 1674 { 1675 h->non_got_ref = 0; 1676 return TRUE; 1677 } 1678 } 1679 1680 /* We must allocate the symbol in our .dynbss section, which will 1681 become part of the .bss section of the executable. There will be 1682 an entry for this symbol in the .dynsym section. The dynamic 1683 object will contain position independent code, so all references 1684 from the dynamic object to this symbol will go through the global 1685 offset table. The dynamic linker will use the .dynsym entry to 1686 determine the address it must put in the global offset table, so 1687 both the dynamic object and the regular object will refer to the 1688 same memory location for the variable. */ 1689 1690 htab = elf_s390_hash_table (info); 1691 if (htab == NULL) 1692 return FALSE; 1693 1694 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1695 copy the initial value out of the dynamic object and into the 1696 runtime process image. */ 1697 if ((h->root.u.def.section->flags & SEC_READONLY) != 0) 1698 { 1699 s = htab->elf.sdynrelro; 1700 srel = htab->elf.sreldynrelro; 1701 } 1702 else 1703 { 1704 s = htab->elf.sdynbss; 1705 srel = htab->elf.srelbss; 1706 } 1707 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1708 { 1709 srel->size += sizeof (Elf64_External_Rela); 1710 h->needs_copy = 1; 1711 } 1712 1713 return _bfd_elf_adjust_dynamic_copy (info, h, s); 1714 } 1715 1716 /* Allocate space in .plt, .got and associated reloc sections for 1717 dynamic relocs. */ 1718 1719 static bfd_boolean 1720 allocate_dynrelocs (struct elf_link_hash_entry *h, 1721 void * inf) 1722 { 1723 struct bfd_link_info *info; 1724 struct elf_s390_link_hash_table *htab; 1725 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h; 1726 struct elf_dyn_relocs *p; 1727 1728 if (h->root.type == bfd_link_hash_indirect) 1729 return TRUE; 1730 1731 info = (struct bfd_link_info *) inf; 1732 htab = elf_s390_hash_table (info); 1733 if (htab == NULL) 1734 return FALSE; 1735 1736 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 1737 here if it is defined and referenced in a non-shared object. */ 1738 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1739 return s390_elf_allocate_ifunc_dyn_relocs (info, h); 1740 else if (htab->elf.dynamic_sections_created 1741 && h->plt.refcount > 0) 1742 { 1743 /* Make sure this symbol is output as a dynamic symbol. 1744 Undefined weak syms won't yet be marked as dynamic. */ 1745 if (h->dynindx == -1 1746 && !h->forced_local) 1747 { 1748 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1749 return FALSE; 1750 } 1751 1752 if (bfd_link_pic (info) 1753 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1754 { 1755 asection *s = htab->elf.splt; 1756 1757 /* If this is the first .plt entry, make room for the special 1758 first entry. */ 1759 if (s->size == 0) 1760 s->size += PLT_FIRST_ENTRY_SIZE; 1761 1762 h->plt.offset = s->size; 1763 1764 /* If this symbol is not defined in a regular file, and we are 1765 not generating a shared library, then set the symbol to this 1766 location in the .plt. This is required to make function 1767 pointers compare as equal between the normal executable and 1768 the shared library. */ 1769 if (! bfd_link_pic (info) 1770 && !h->def_regular) 1771 { 1772 h->root.u.def.section = s; 1773 h->root.u.def.value = h->plt.offset; 1774 } 1775 1776 /* Make room for this entry. */ 1777 s->size += PLT_ENTRY_SIZE; 1778 1779 /* We also need to make an entry in the .got.plt section, which 1780 will be placed in the .got section by the linker script. */ 1781 htab->elf.sgotplt->size += GOT_ENTRY_SIZE; 1782 1783 /* We also need to make an entry in the .rela.plt section. */ 1784 htab->elf.srelplt->size += sizeof (Elf64_External_Rela); 1785 } 1786 else 1787 { 1788 h->plt.offset = (bfd_vma) -1; 1789 h->needs_plt = 0; 1790 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1791 } 1792 } 1793 else 1794 { 1795 h->plt.offset = (bfd_vma) -1; 1796 h->needs_plt = 0; 1797 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1798 } 1799 1800 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to 1801 the binary, we can optimize a bit. IE64 and GOTIE64 get converted 1802 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT 1803 we can save the dynamic TLS relocation. */ 1804 if (h->got.refcount > 0 1805 && !bfd_link_pic (info) 1806 && h->dynindx == -1 1807 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1808 { 1809 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1810 /* For the GOTIE access without a literal pool entry the offset has 1811 to be stored somewhere. The immediate value in the instruction 1812 is not bit enough so the value is stored in the got. */ 1813 { 1814 h->got.offset = htab->elf.sgot->size; 1815 htab->elf.sgot->size += GOT_ENTRY_SIZE; 1816 } 1817 else 1818 h->got.offset = (bfd_vma) -1; 1819 } 1820 else if (h->got.refcount > 0) 1821 { 1822 asection *s; 1823 bfd_boolean dyn; 1824 int tls_type = elf_s390_hash_entry(h)->tls_type; 1825 1826 /* Make sure this symbol is output as a dynamic symbol. 1827 Undefined weak syms won't yet be marked as dynamic. */ 1828 if (h->dynindx == -1 1829 && !h->forced_local) 1830 { 1831 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1832 return FALSE; 1833 } 1834 1835 s = htab->elf.sgot; 1836 h->got.offset = s->size; 1837 s->size += GOT_ENTRY_SIZE; 1838 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */ 1839 if (tls_type == GOT_TLS_GD) 1840 s->size += GOT_ENTRY_SIZE; 1841 dyn = htab->elf.dynamic_sections_created; 1842 /* R_390_TLS_IE64 needs one dynamic relocation, 1843 R_390_TLS_GD64 needs one if local symbol and two if global. */ 1844 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1845 || tls_type >= GOT_TLS_IE) 1846 htab->elf.srelgot->size += sizeof (Elf64_External_Rela); 1847 else if (tls_type == GOT_TLS_GD) 1848 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela); 1849 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1850 || h->root.type != bfd_link_hash_undefweak) 1851 && (bfd_link_pic (info) 1852 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1853 htab->elf.srelgot->size += sizeof (Elf64_External_Rela); 1854 } 1855 else 1856 h->got.offset = (bfd_vma) -1; 1857 1858 if (eh->dyn_relocs == NULL) 1859 return TRUE; 1860 1861 /* In the shared -Bsymbolic case, discard space allocated for 1862 dynamic pc-relative relocs against symbols which turn out to be 1863 defined in regular objects. For the normal shared case, discard 1864 space for pc-relative relocs that have become local due to symbol 1865 visibility changes. */ 1866 1867 if (bfd_link_pic (info)) 1868 { 1869 if (SYMBOL_CALLS_LOCAL (info, h)) 1870 { 1871 struct elf_dyn_relocs **pp; 1872 1873 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1874 { 1875 p->count -= p->pc_count; 1876 p->pc_count = 0; 1877 if (p->count == 0) 1878 *pp = p->next; 1879 else 1880 pp = &p->next; 1881 } 1882 } 1883 1884 /* Also discard relocs on undefined weak syms with non-default 1885 visibility. */ 1886 if (eh->dyn_relocs != NULL 1887 && h->root.type == bfd_link_hash_undefweak) 1888 { 1889 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1890 eh->dyn_relocs = NULL; 1891 1892 /* Make sure undefined weak symbols are output as a dynamic 1893 symbol in PIEs. */ 1894 else if (h->dynindx == -1 1895 && !h->forced_local) 1896 { 1897 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1898 return FALSE; 1899 } 1900 } 1901 } 1902 else if (ELIMINATE_COPY_RELOCS) 1903 { 1904 /* For the non-shared case, discard space for relocs against 1905 symbols which turn out to need copy relocs or are not 1906 dynamic. */ 1907 1908 if (!h->non_got_ref 1909 && ((h->def_dynamic 1910 && !h->def_regular) 1911 || (htab->elf.dynamic_sections_created 1912 && (h->root.type == bfd_link_hash_undefweak 1913 || h->root.type == bfd_link_hash_undefined)))) 1914 { 1915 /* Make sure this symbol is output as a dynamic symbol. 1916 Undefined weak syms won't yet be marked as dynamic. */ 1917 if (h->dynindx == -1 1918 && !h->forced_local) 1919 { 1920 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1921 return FALSE; 1922 } 1923 1924 /* If that succeeded, we know we'll be keeping all the 1925 relocs. */ 1926 if (h->dynindx != -1) 1927 goto keep; 1928 } 1929 1930 eh->dyn_relocs = NULL; 1931 1932 keep: ; 1933 } 1934 1935 /* Finally, allocate space. */ 1936 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1937 { 1938 asection *sreloc = elf_section_data (p->sec)->sreloc; 1939 sreloc->size += p->count * sizeof (Elf64_External_Rela); 1940 } 1941 1942 return TRUE; 1943 } 1944 1945 /* Find any dynamic relocs that apply to read-only sections. */ 1946 1947 static bfd_boolean 1948 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1949 { 1950 struct elf_s390_link_hash_entry *eh; 1951 struct elf_dyn_relocs *p; 1952 1953 eh = (struct elf_s390_link_hash_entry *) h; 1954 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1955 { 1956 asection *s = p->sec->output_section; 1957 1958 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1959 { 1960 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1961 1962 info->flags |= DF_TEXTREL; 1963 1964 /* Not an error, just cut short the traversal. */ 1965 return FALSE; 1966 } 1967 } 1968 return TRUE; 1969 } 1970 1971 /* Set the sizes of the dynamic sections. */ 1972 1973 static bfd_boolean 1974 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1975 struct bfd_link_info *info) 1976 { 1977 struct elf_s390_link_hash_table *htab; 1978 bfd *dynobj; 1979 asection *s; 1980 bfd_boolean relocs; 1981 bfd *ibfd; 1982 1983 htab = elf_s390_hash_table (info); 1984 if (htab == NULL) 1985 return FALSE; 1986 1987 dynobj = htab->elf.dynobj; 1988 if (dynobj == NULL) 1989 abort (); 1990 1991 if (htab->elf.dynamic_sections_created) 1992 { 1993 /* Set the contents of the .interp section to the interpreter. */ 1994 if (bfd_link_executable (info) && !info->nointerp) 1995 { 1996 s = bfd_get_linker_section (dynobj, ".interp"); 1997 if (s == NULL) 1998 abort (); 1999 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2000 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2001 } 2002 } 2003 2004 /* Set up .got offsets for local syms, and space for local dynamic 2005 relocs. */ 2006 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2007 { 2008 bfd_signed_vma *local_got; 2009 bfd_signed_vma *end_local_got; 2010 char *local_tls_type; 2011 bfd_size_type locsymcount; 2012 Elf_Internal_Shdr *symtab_hdr; 2013 asection *srela; 2014 struct plt_entry *local_plt; 2015 unsigned int i; 2016 2017 if (! is_s390_elf (ibfd)) 2018 continue; 2019 2020 for (s = ibfd->sections; s != NULL; s = s->next) 2021 { 2022 struct elf_dyn_relocs *p; 2023 2024 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 2025 { 2026 if (!bfd_is_abs_section (p->sec) 2027 && bfd_is_abs_section (p->sec->output_section)) 2028 { 2029 /* Input section has been discarded, either because 2030 it is a copy of a linkonce section or due to 2031 linker script /DISCARD/, so we'll be discarding 2032 the relocs too. */ 2033 } 2034 else if (p->count != 0) 2035 { 2036 srela = elf_section_data (p->sec)->sreloc; 2037 srela->size += p->count * sizeof (Elf64_External_Rela); 2038 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2039 info->flags |= DF_TEXTREL; 2040 } 2041 } 2042 } 2043 2044 local_got = elf_local_got_refcounts (ibfd); 2045 if (!local_got) 2046 continue; 2047 2048 symtab_hdr = &elf_symtab_hdr (ibfd); 2049 locsymcount = symtab_hdr->sh_info; 2050 end_local_got = local_got + locsymcount; 2051 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2052 s = htab->elf.sgot; 2053 srela = htab->elf.srelgot; 2054 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2055 { 2056 if (*local_got > 0) 2057 { 2058 *local_got = s->size; 2059 s->size += GOT_ENTRY_SIZE; 2060 if (*local_tls_type == GOT_TLS_GD) 2061 s->size += GOT_ENTRY_SIZE; 2062 if (bfd_link_pic (info)) 2063 srela->size += sizeof (Elf64_External_Rela); 2064 } 2065 else 2066 *local_got = (bfd_vma) -1; 2067 } 2068 2069 local_plt = elf_s390_local_plt (ibfd); 2070 for (i = 0; i < symtab_hdr->sh_info; i++) 2071 { 2072 if (local_plt[i].plt.refcount > 0) 2073 { 2074 local_plt[i].plt.offset = htab->elf.iplt->size; 2075 htab->elf.iplt->size += PLT_ENTRY_SIZE; 2076 htab->elf.igotplt->size += GOT_ENTRY_SIZE; 2077 htab->elf.irelplt->size += sizeof (Elf64_External_Rela); 2078 } 2079 else 2080 local_plt[i].plt.offset = (bfd_vma) -1; 2081 } 2082 } 2083 2084 if (htab->tls_ldm_got.refcount > 0) 2085 { 2086 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64 2087 relocs. */ 2088 htab->tls_ldm_got.offset = htab->elf.sgot->size; 2089 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; 2090 htab->elf.srelgot->size += sizeof (Elf64_External_Rela); 2091 } 2092 else 2093 htab->tls_ldm_got.offset = -1; 2094 2095 /* Allocate global sym .plt and .got entries, and space for global 2096 sym dynamic relocs. */ 2097 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 2098 2099 /* We now have determined the sizes of the various dynamic sections. 2100 Allocate memory for them. */ 2101 relocs = FALSE; 2102 for (s = dynobj->sections; s != NULL; s = s->next) 2103 { 2104 if ((s->flags & SEC_LINKER_CREATED) == 0) 2105 continue; 2106 2107 if (s == htab->elf.splt 2108 || s == htab->elf.sgot 2109 || s == htab->elf.sgotplt 2110 || s == htab->elf.sdynbss 2111 || s == htab->elf.sdynrelro 2112 || s == htab->elf.iplt 2113 || s == htab->elf.igotplt 2114 || s == htab->irelifunc) 2115 { 2116 /* Strip this section if we don't need it; see the 2117 comment below. */ 2118 } 2119 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2120 { 2121 if (s->size != 0 && s != htab->elf.srelplt) 2122 relocs = TRUE; 2123 2124 /* We use the reloc_count field as a counter if we need 2125 to copy relocs into the output file. */ 2126 s->reloc_count = 0; 2127 } 2128 else 2129 { 2130 /* It's not one of our sections, so don't allocate space. */ 2131 continue; 2132 } 2133 2134 if (s->size == 0) 2135 { 2136 /* If we don't need this section, strip it from the 2137 output file. This is to handle .rela.bss and 2138 .rela.plt. We must create it in 2139 create_dynamic_sections, because it must be created 2140 before the linker maps input sections to output 2141 sections. The linker does that before 2142 adjust_dynamic_symbol is called, and it is that 2143 function which decides whether anything needs to go 2144 into these sections. */ 2145 2146 s->flags |= SEC_EXCLUDE; 2147 continue; 2148 } 2149 2150 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2151 continue; 2152 2153 /* Allocate memory for the section contents. We use bfd_zalloc 2154 here in case unused entries are not reclaimed before the 2155 section's contents are written out. This should not happen, 2156 but this way if it does, we get a R_390_NONE reloc instead 2157 of garbage. */ 2158 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2159 if (s->contents == NULL) 2160 return FALSE; 2161 } 2162 2163 if (htab->elf.dynamic_sections_created) 2164 { 2165 /* Add some entries to the .dynamic section. We fill in the 2166 values later, in elf_s390_finish_dynamic_sections, but we 2167 must add the entries now so that we get the correct size for 2168 the .dynamic section. The DT_DEBUG entry is filled in by the 2169 dynamic linker and used by the debugger. */ 2170 #define add_dynamic_entry(TAG, VAL) \ 2171 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2172 2173 if (bfd_link_executable (info)) 2174 { 2175 if (!add_dynamic_entry (DT_DEBUG, 0)) 2176 return FALSE; 2177 } 2178 2179 if (htab->elf.splt->size != 0) 2180 { 2181 if (!add_dynamic_entry (DT_PLTGOT, 0) 2182 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2183 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2184 || !add_dynamic_entry (DT_JMPREL, 0)) 2185 return FALSE; 2186 } 2187 2188 if (relocs) 2189 { 2190 if (!add_dynamic_entry (DT_RELA, 0) 2191 || !add_dynamic_entry (DT_RELASZ, 0) 2192 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 2193 return FALSE; 2194 2195 /* If any dynamic relocs apply to a read-only section, 2196 then we need a DT_TEXTREL entry. */ 2197 if ((info->flags & DF_TEXTREL) == 0) 2198 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2199 info); 2200 2201 if ((info->flags & DF_TEXTREL) != 0) 2202 { 2203 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2204 return FALSE; 2205 } 2206 } 2207 } 2208 #undef add_dynamic_entry 2209 2210 return TRUE; 2211 } 2212 2213 /* Return the base VMA address which should be subtracted from real addresses 2214 when resolving @dtpoff relocation. 2215 This is PT_TLS segment p_vaddr. */ 2216 2217 static bfd_vma 2218 dtpoff_base (struct bfd_link_info *info) 2219 { 2220 /* If tls_sec is NULL, we should have signalled an error already. */ 2221 if (elf_hash_table (info)->tls_sec == NULL) 2222 return 0; 2223 return elf_hash_table (info)->tls_sec->vma; 2224 } 2225 2226 /* Return the relocation value for @tpoff relocation 2227 if STT_TLS virtual address is ADDRESS. */ 2228 2229 static bfd_vma 2230 tpoff (struct bfd_link_info *info, bfd_vma address) 2231 { 2232 struct elf_link_hash_table *htab = elf_hash_table (info); 2233 2234 /* If tls_sec is NULL, we should have signalled an error already. */ 2235 if (htab->tls_sec == NULL) 2236 return 0; 2237 return htab->tls_size + htab->tls_sec->vma - address; 2238 } 2239 2240 /* Complain if TLS instruction relocation is against an invalid 2241 instruction. */ 2242 2243 static void 2244 invalid_tls_insn (bfd *input_bfd, 2245 asection *input_section, 2246 Elf_Internal_Rela *rel) 2247 { 2248 reloc_howto_type *howto; 2249 2250 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info); 2251 _bfd_error_handler 2252 /* xgettext:c-format */ 2253 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"), 2254 input_bfd, 2255 input_section, 2256 (long) rel->r_offset, 2257 howto->name); 2258 bfd_set_error (bfd_error_bad_value); 2259 } 2260 2261 /* Relocate a 390 ELF section. */ 2262 2263 static bfd_boolean 2264 elf_s390_relocate_section (bfd *output_bfd, 2265 struct bfd_link_info *info, 2266 bfd *input_bfd, 2267 asection *input_section, 2268 bfd_byte *contents, 2269 Elf_Internal_Rela *relocs, 2270 Elf_Internal_Sym *local_syms, 2271 asection **local_sections) 2272 { 2273 struct elf_s390_link_hash_table *htab; 2274 Elf_Internal_Shdr *symtab_hdr; 2275 struct elf_link_hash_entry **sym_hashes; 2276 bfd_vma *local_got_offsets; 2277 Elf_Internal_Rela *rel; 2278 Elf_Internal_Rela *relend; 2279 2280 BFD_ASSERT (is_s390_elf (input_bfd)); 2281 2282 htab = elf_s390_hash_table (info); 2283 if (htab == NULL) 2284 return FALSE; 2285 2286 symtab_hdr = &elf_symtab_hdr (input_bfd); 2287 sym_hashes = elf_sym_hashes (input_bfd); 2288 local_got_offsets = elf_local_got_offsets (input_bfd); 2289 2290 rel = relocs; 2291 relend = relocs + input_section->reloc_count; 2292 for (; rel < relend; rel++) 2293 { 2294 unsigned int r_type; 2295 reloc_howto_type *howto; 2296 unsigned long r_symndx; 2297 struct elf_link_hash_entry *h; 2298 Elf_Internal_Sym *sym; 2299 asection *sec; 2300 bfd_vma off; 2301 bfd_vma relocation; 2302 bfd_boolean unresolved_reloc; 2303 bfd_reloc_status_type r; 2304 int tls_type; 2305 asection *base_got = htab->elf.sgot; 2306 2307 r_type = ELF64_R_TYPE (rel->r_info); 2308 if (r_type == (int) R_390_GNU_VTINHERIT 2309 || r_type == (int) R_390_GNU_VTENTRY) 2310 continue; 2311 if (r_type >= (int) R_390_max) 2312 { 2313 bfd_set_error (bfd_error_bad_value); 2314 return FALSE; 2315 } 2316 2317 howto = elf_howto_table + r_type; 2318 r_symndx = ELF64_R_SYM (rel->r_info); 2319 2320 h = NULL; 2321 sym = NULL; 2322 sec = NULL; 2323 unresolved_reloc = FALSE; 2324 if (r_symndx < symtab_hdr->sh_info) 2325 { 2326 sym = local_syms + r_symndx; 2327 sec = local_sections[r_symndx]; 2328 2329 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2330 { 2331 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd); 2332 if (local_plt == NULL) 2333 return FALSE; 2334 2335 /* Address of the PLT slot. */ 2336 relocation = (htab->elf.iplt->output_section->vma 2337 + htab->elf.iplt->output_offset 2338 + local_plt[r_symndx].plt.offset); 2339 2340 switch (r_type) 2341 { 2342 case R_390_PLTOFF16: 2343 case R_390_PLTOFF32: 2344 case R_390_PLTOFF64: 2345 relocation -= htab->elf.sgot->output_section->vma; 2346 break; 2347 case R_390_GOTPLT12: 2348 case R_390_GOTPLT16: 2349 case R_390_GOTPLT20: 2350 case R_390_GOTPLT32: 2351 case R_390_GOTPLT64: 2352 case R_390_GOTPLTENT: 2353 case R_390_GOT12: 2354 case R_390_GOT16: 2355 case R_390_GOT20: 2356 case R_390_GOT32: 2357 case R_390_GOT64: 2358 case R_390_GOTENT: 2359 { 2360 /* Write the PLT slot address into the GOT slot. */ 2361 bfd_put_64 (output_bfd, relocation, 2362 htab->elf.sgot->contents + 2363 local_got_offsets[r_symndx]); 2364 relocation = (local_got_offsets[r_symndx] + 2365 htab->elf.sgot->output_offset); 2366 2367 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2368 relocation += htab->elf.sgot->output_section->vma; 2369 break; 2370 } 2371 default: 2372 break; 2373 } 2374 /* The output section is needed later in 2375 finish_dynamic_section when creating the dynamic 2376 relocation. */ 2377 local_plt[r_symndx].sec = sec; 2378 goto do_relocation; 2379 } 2380 else 2381 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2382 } 2383 else 2384 { 2385 bfd_boolean warned ATTRIBUTE_UNUSED; 2386 bfd_boolean ignored ATTRIBUTE_UNUSED; 2387 2388 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2389 r_symndx, symtab_hdr, sym_hashes, 2390 h, sec, relocation, 2391 unresolved_reloc, warned, ignored); 2392 } 2393 2394 if (sec != NULL && discarded_section (sec)) 2395 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2396 rel, 1, relend, howto, 0, contents); 2397 2398 if (bfd_link_relocatable (info)) 2399 continue; 2400 2401 switch (r_type) 2402 { 2403 case R_390_GOTPLT12: 2404 case R_390_GOTPLT16: 2405 case R_390_GOTPLT20: 2406 case R_390_GOTPLT32: 2407 case R_390_GOTPLT64: 2408 case R_390_GOTPLTENT: 2409 /* There are three cases for a GOTPLT relocation. 1) The 2410 relocation is against the jump slot entry of a plt that 2411 will get emitted to the output file. 2) The relocation 2412 is against the jump slot of a plt entry that has been 2413 removed. elf_s390_adjust_gotplt has created a GOT entry 2414 as replacement. 3) The relocation is against a local symbol. 2415 Cases 2) and 3) are the same as the GOT relocation code 2416 so we just have to test for case 1 and fall through for 2417 the other two. */ 2418 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2419 { 2420 bfd_vma plt_index; 2421 2422 if (s390_is_ifunc_symbol_p (h)) 2423 { 2424 plt_index = h->plt.offset / PLT_ENTRY_SIZE; 2425 relocation = (plt_index * GOT_ENTRY_SIZE + 2426 htab->elf.igotplt->output_offset); 2427 if (r_type == R_390_GOTPLTENT) 2428 relocation += htab->elf.igotplt->output_section->vma; 2429 } 2430 else 2431 { 2432 /* Calc. index no. 2433 Current offset - size first entry / entry size. */ 2434 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2435 PLT_ENTRY_SIZE; 2436 2437 /* Offset in GOT is PLT index plus GOT headers(3) 2438 times 8, addr & GOT addr. */ 2439 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2440 if (r_type == R_390_GOTPLTENT) 2441 relocation += htab->elf.sgot->output_section->vma; 2442 } 2443 unresolved_reloc = FALSE; 2444 break; 2445 } 2446 /* Fall through. */ 2447 2448 case R_390_GOT12: 2449 case R_390_GOT16: 2450 case R_390_GOT20: 2451 case R_390_GOT32: 2452 case R_390_GOT64: 2453 case R_390_GOTENT: 2454 /* Relocation is to the entry for this symbol in the global 2455 offset table. */ 2456 if (base_got == NULL) 2457 abort (); 2458 2459 if (h != NULL) 2460 { 2461 bfd_boolean dyn; 2462 2463 off = h->got.offset; 2464 dyn = htab->elf.dynamic_sections_created; 2465 2466 if (s390_is_ifunc_symbol_p (h)) 2467 { 2468 BFD_ASSERT (h->plt.offset != (bfd_vma) -1); 2469 if (off == (bfd_vma)-1) 2470 { 2471 /* No explicit GOT usage so redirect to the 2472 got.iplt slot. */ 2473 base_got = htab->elf.igotplt; 2474 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE; 2475 } 2476 else 2477 { 2478 /* Explicit GOT slots must contain the address 2479 of the PLT slot. This will be handled in 2480 finish_dynamic_symbol. */ 2481 } 2482 } 2483 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 2484 bfd_link_pic (info), 2485 h) 2486 || (bfd_link_pic (info) 2487 && SYMBOL_REFERENCES_LOCAL (info, h)) 2488 || (ELF_ST_VISIBILITY (h->other) 2489 && h->root.type == bfd_link_hash_undefweak)) 2490 { 2491 /* This is actually a static link, or it is a 2492 -Bsymbolic link and the symbol is defined 2493 locally, or the symbol was forced to be local 2494 because of a version file. We must initialize 2495 this entry in the global offset table. Since the 2496 offset must always be a multiple of 2, we use the 2497 least significant bit to record whether we have 2498 initialized it already. 2499 2500 When doing a dynamic link, we create a .rel.got 2501 relocation entry to initialize the value. This 2502 is done in the finish_dynamic_symbol routine. */ 2503 if ((off & 1) != 0) 2504 off &= ~1; 2505 else 2506 { 2507 bfd_put_64 (output_bfd, relocation, 2508 base_got->contents + off); 2509 h->got.offset |= 1; 2510 } 2511 2512 if ((h->def_regular 2513 && bfd_link_pic (info) 2514 && SYMBOL_REFERENCES_LOCAL (info, h)) 2515 /* lgrl rx,sym@GOTENT -> larl rx, sym */ 2516 && ((r_type == R_390_GOTENT 2517 && (bfd_get_16 (input_bfd, 2518 contents + rel->r_offset - 2) 2519 & 0xff0f) == 0xc408) 2520 /* lg rx, sym@GOT(r12) -> larl rx, sym */ 2521 || (r_type == R_390_GOT20 2522 && (bfd_get_32 (input_bfd, 2523 contents + rel->r_offset - 2) 2524 & 0xff00f000) == 0xe300c000 2525 && bfd_get_8 (input_bfd, 2526 contents + rel->r_offset + 3) == 0x04))) 2527 2528 { 2529 unsigned short new_insn = 2530 (0xc000 | (bfd_get_8 (input_bfd, 2531 contents + rel->r_offset - 1) & 0xf0)); 2532 bfd_put_16 (output_bfd, new_insn, 2533 contents + rel->r_offset - 2); 2534 r_type = R_390_PC32DBL; 2535 rel->r_addend = 2; 2536 howto = elf_howto_table + r_type; 2537 relocation = h->root.u.def.value 2538 + h->root.u.def.section->output_section->vma 2539 + h->root.u.def.section->output_offset; 2540 goto do_relocation; 2541 } 2542 } 2543 else 2544 unresolved_reloc = FALSE; 2545 } 2546 else 2547 { 2548 if (local_got_offsets == NULL) 2549 abort (); 2550 2551 off = local_got_offsets[r_symndx]; 2552 2553 /* The offset must always be a multiple of 8. We use 2554 the least significant bit to record whether we have 2555 already generated the necessary reloc. */ 2556 if ((off & 1) != 0) 2557 off &= ~1; 2558 else 2559 { 2560 bfd_put_64 (output_bfd, relocation, 2561 htab->elf.sgot->contents + off); 2562 2563 if (bfd_link_pic (info)) 2564 { 2565 asection *s; 2566 Elf_Internal_Rela outrel; 2567 bfd_byte *loc; 2568 2569 s = htab->elf.srelgot; 2570 if (s == NULL) 2571 abort (); 2572 2573 outrel.r_offset = (htab->elf.sgot->output_section->vma 2574 + htab->elf.sgot->output_offset 2575 + off); 2576 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2577 outrel.r_addend = relocation; 2578 loc = s->contents; 2579 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2580 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2581 } 2582 2583 local_got_offsets[r_symndx] |= 1; 2584 } 2585 } 2586 2587 if (off >= (bfd_vma) -2) 2588 abort (); 2589 2590 relocation = base_got->output_offset + off; 2591 2592 /* For @GOTENT the relocation is against the offset between 2593 the instruction and the symbols entry in the GOT and not 2594 between the start of the GOT and the symbols entry. We 2595 add the vma of the GOT to get the correct value. */ 2596 if ( r_type == R_390_GOTENT 2597 || r_type == R_390_GOTPLTENT) 2598 relocation += base_got->output_section->vma; 2599 2600 break; 2601 2602 case R_390_GOTOFF16: 2603 case R_390_GOTOFF32: 2604 case R_390_GOTOFF64: 2605 /* Relocation is relative to the start of the global offset 2606 table. */ 2607 2608 if (h != NULL 2609 && s390_is_ifunc_symbol_p (h) 2610 && h->def_regular 2611 && !bfd_link_executable (info)) 2612 { 2613 relocation = (htab->elf.iplt->output_section->vma 2614 + htab->elf.iplt->output_offset 2615 + h->plt.offset 2616 - htab->elf.sgot->output_section->vma); 2617 goto do_relocation; 2618 } 2619 2620 /* Note that sgot->output_offset is not involved in this 2621 calculation. We always want the start of .got. If we 2622 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2623 permitted by the ABI, we might have to change this 2624 calculation. */ 2625 relocation -= htab->elf.sgot->output_section->vma; 2626 break; 2627 2628 case R_390_GOTPC: 2629 case R_390_GOTPCDBL: 2630 /* Use global offset table as symbol value. */ 2631 relocation = htab->elf.sgot->output_section->vma; 2632 unresolved_reloc = FALSE; 2633 break; 2634 2635 case R_390_PLT12DBL: 2636 case R_390_PLT16DBL: 2637 case R_390_PLT24DBL: 2638 case R_390_PLT32: 2639 case R_390_PLT32DBL: 2640 case R_390_PLT64: 2641 /* Relocation is to the entry for this symbol in the 2642 procedure linkage table. */ 2643 2644 /* Resolve a PLT32 reloc against a local symbol directly, 2645 without using the procedure linkage table. */ 2646 if (h == NULL) 2647 break; 2648 2649 if (h->plt.offset == (bfd_vma) -1 2650 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h))) 2651 { 2652 /* We didn't make a PLT entry for this symbol. This 2653 happens when statically linking PIC code, or when 2654 using -Bsymbolic. */ 2655 break; 2656 } 2657 if (s390_is_ifunc_symbol_p (h)) 2658 relocation = (htab->elf.iplt->output_section->vma 2659 + htab->elf.iplt->output_offset 2660 + h->plt.offset); 2661 else 2662 relocation = (htab->elf.splt->output_section->vma 2663 + htab->elf.splt->output_offset 2664 + h->plt.offset); 2665 unresolved_reloc = FALSE; 2666 break; 2667 2668 case R_390_PLTOFF16: 2669 case R_390_PLTOFF32: 2670 case R_390_PLTOFF64: 2671 /* Relocation is to the entry for this symbol in the 2672 procedure linkage table relative to the start of the GOT. */ 2673 2674 /* For local symbols or if we didn't make a PLT entry for 2675 this symbol resolve the symbol directly. */ 2676 if (h == NULL 2677 || h->plt.offset == (bfd_vma) -1 2678 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h))) 2679 { 2680 relocation -= htab->elf.sgot->output_section->vma; 2681 break; 2682 } 2683 2684 if (s390_is_ifunc_symbol_p (h)) 2685 relocation = (htab->elf.iplt->output_section->vma 2686 + htab->elf.iplt->output_offset 2687 + h->plt.offset 2688 - htab->elf.sgot->output_section->vma); 2689 else 2690 relocation = (htab->elf.splt->output_section->vma 2691 + htab->elf.splt->output_offset 2692 + h->plt.offset 2693 - htab->elf.sgot->output_section->vma); 2694 unresolved_reloc = FALSE; 2695 break; 2696 2697 case R_390_PC16: 2698 case R_390_PC12DBL: 2699 case R_390_PC16DBL: 2700 case R_390_PC24DBL: 2701 case R_390_PC32: 2702 case R_390_PC32DBL: 2703 case R_390_PC64: 2704 if (h != NULL 2705 && bfd_link_pie (info) 2706 && !h->def_regular) 2707 { 2708 _bfd_error_handler (_("%B: `%s' non-PLT reloc for symbol defined " 2709 "in shared library and accessed " 2710 "from executable " 2711 "(rebuild file with -fPIC ?)"), 2712 input_bfd, h->root.root.string); 2713 bfd_set_error (bfd_error_bad_value); 2714 return FALSE; 2715 } 2716 /* The target of these relocs are instruction operands 2717 residing in read-only sections. We cannot emit a runtime 2718 reloc for it. */ 2719 if (h != NULL 2720 && s390_is_ifunc_symbol_p (h) 2721 && h->def_regular 2722 && bfd_link_pic (info)) 2723 { 2724 relocation = (htab->elf.iplt->output_section->vma 2725 + htab->elf.iplt->output_offset 2726 + h->plt.offset); 2727 goto do_relocation; 2728 } 2729 /* Fall through. */ 2730 2731 case R_390_8: 2732 case R_390_16: 2733 case R_390_32: 2734 case R_390_64: 2735 2736 if (h != NULL 2737 && s390_is_ifunc_symbol_p (h) 2738 && h->def_regular) 2739 { 2740 if (!bfd_link_pic (info) || !h->non_got_ref) 2741 { 2742 /* For a non-shared object STT_GNU_IFUNC symbol must 2743 go through PLT. */ 2744 relocation = (htab->elf.iplt->output_section->vma 2745 + htab->elf.iplt->output_offset 2746 + h ->plt.offset); 2747 goto do_relocation; 2748 } 2749 else 2750 { 2751 /* For shared objects a runtime relocation is needed. */ 2752 2753 Elf_Internal_Rela outrel; 2754 asection *sreloc; 2755 2756 /* Need a dynamic relocation to get the real function 2757 address. */ 2758 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2759 info, 2760 input_section, 2761 rel->r_offset); 2762 if (outrel.r_offset == (bfd_vma) -1 2763 || outrel.r_offset == (bfd_vma) -2) 2764 abort (); 2765 2766 outrel.r_offset += (input_section->output_section->vma 2767 + input_section->output_offset); 2768 2769 if (h->dynindx == -1 2770 || h->forced_local 2771 || bfd_link_executable (info)) 2772 { 2773 /* This symbol is resolved locally. */ 2774 outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE); 2775 outrel.r_addend = (h->root.u.def.value 2776 + h->root.u.def.section->output_section->vma 2777 + h->root.u.def.section->output_offset); 2778 } 2779 else 2780 { 2781 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2782 outrel.r_addend = 0; 2783 } 2784 2785 sreloc = htab->elf.irelifunc; 2786 elf_append_rela (output_bfd, sreloc, &outrel); 2787 2788 /* If this reloc is against an external symbol, we 2789 do not want to fiddle with the addend. Otherwise, 2790 we need to include the symbol value so that it 2791 becomes an addend for the dynamic reloc. For an 2792 internal symbol, we have updated addend. */ 2793 continue; 2794 } 2795 } 2796 2797 if ((input_section->flags & SEC_ALLOC) == 0) 2798 break; 2799 2800 if ((bfd_link_pic (info) 2801 && (h == NULL 2802 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2803 || h->root.type != bfd_link_hash_undefweak) 2804 && ((r_type != R_390_PC16 2805 && r_type != R_390_PC12DBL 2806 && r_type != R_390_PC16DBL 2807 && r_type != R_390_PC24DBL 2808 && r_type != R_390_PC32 2809 && r_type != R_390_PC32DBL 2810 && r_type != R_390_PC64) 2811 || !SYMBOL_CALLS_LOCAL (info, h))) 2812 || (ELIMINATE_COPY_RELOCS 2813 && !bfd_link_pic (info) 2814 && h != NULL 2815 && h->dynindx != -1 2816 && !h->non_got_ref 2817 && ((h->def_dynamic 2818 && !h->def_regular) 2819 || h->root.type == bfd_link_hash_undefweak 2820 || h->root.type == bfd_link_hash_undefined))) 2821 { 2822 Elf_Internal_Rela outrel; 2823 bfd_boolean skip, relocate; 2824 asection *sreloc; 2825 bfd_byte *loc; 2826 2827 /* When generating a shared object, these relocations 2828 are copied into the output file to be resolved at run 2829 time. */ 2830 skip = FALSE; 2831 relocate = FALSE; 2832 2833 outrel.r_offset = 2834 _bfd_elf_section_offset (output_bfd, info, input_section, 2835 rel->r_offset); 2836 if (outrel.r_offset == (bfd_vma) -1) 2837 skip = TRUE; 2838 else if (outrel.r_offset == (bfd_vma) -2) 2839 skip = TRUE, relocate = TRUE; 2840 2841 outrel.r_offset += (input_section->output_section->vma 2842 + input_section->output_offset); 2843 2844 if (skip) 2845 memset (&outrel, 0, sizeof outrel); 2846 else if (h != NULL 2847 && h->dynindx != -1 2848 && (r_type == R_390_PC16 2849 || r_type == R_390_PC12DBL 2850 || r_type == R_390_PC16DBL 2851 || r_type == R_390_PC24DBL 2852 || r_type == R_390_PC32 2853 || r_type == R_390_PC32DBL 2854 || r_type == R_390_PC64 2855 || !bfd_link_pic (info) 2856 || !SYMBOLIC_BIND (info, h) 2857 || !h->def_regular)) 2858 { 2859 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2860 outrel.r_addend = rel->r_addend; 2861 } 2862 else 2863 { 2864 /* This symbol is local, or marked to become local. */ 2865 outrel.r_addend = relocation + rel->r_addend; 2866 if (r_type == R_390_64) 2867 { 2868 relocate = TRUE; 2869 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2870 } 2871 else 2872 { 2873 long sindx; 2874 2875 if (bfd_is_abs_section (sec)) 2876 sindx = 0; 2877 else if (sec == NULL || sec->owner == NULL) 2878 { 2879 bfd_set_error(bfd_error_bad_value); 2880 return FALSE; 2881 } 2882 else 2883 { 2884 asection *osec; 2885 2886 osec = sec->output_section; 2887 sindx = elf_section_data (osec)->dynindx; 2888 2889 if (sindx == 0) 2890 { 2891 osec = htab->elf.text_index_section; 2892 sindx = elf_section_data (osec)->dynindx; 2893 } 2894 BFD_ASSERT (sindx != 0); 2895 2896 /* We are turning this relocation into one 2897 against a section symbol, so subtract out 2898 the output section's address but not the 2899 offset of the input section in the output 2900 section. */ 2901 outrel.r_addend -= osec->vma; 2902 } 2903 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2904 } 2905 } 2906 2907 sreloc = elf_section_data (input_section)->sreloc; 2908 if (sreloc == NULL) 2909 abort (); 2910 2911 loc = sreloc->contents; 2912 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2913 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2914 2915 /* If this reloc is against an external symbol, we do 2916 not want to fiddle with the addend. Otherwise, we 2917 need to include the symbol value so that it becomes 2918 an addend for the dynamic reloc. */ 2919 if (! relocate) 2920 continue; 2921 } 2922 2923 break; 2924 2925 /* Relocations for tls literal pool entries. */ 2926 case R_390_TLS_IE64: 2927 if (bfd_link_pic (info)) 2928 { 2929 Elf_Internal_Rela outrel; 2930 asection *sreloc; 2931 bfd_byte *loc; 2932 2933 outrel.r_offset = rel->r_offset 2934 + input_section->output_section->vma 2935 + input_section->output_offset; 2936 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 2937 sreloc = elf_section_data (input_section)->sreloc; 2938 if (sreloc == NULL) 2939 abort (); 2940 loc = sreloc->contents; 2941 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2942 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc); 2943 } 2944 /* Fall through. */ 2945 2946 case R_390_TLS_GD64: 2947 case R_390_TLS_GOTIE64: 2948 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2949 tls_type = GOT_UNKNOWN; 2950 if (h == NULL && local_got_offsets) 2951 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2952 else if (h != NULL) 2953 { 2954 tls_type = elf_s390_hash_entry(h)->tls_type; 2955 if (!bfd_link_pic (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2956 r_type = R_390_TLS_LE64; 2957 } 2958 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE) 2959 r_type = R_390_TLS_IE64; 2960 2961 if (r_type == R_390_TLS_LE64) 2962 { 2963 /* This relocation gets optimized away by the local exec 2964 access optimization. */ 2965 BFD_ASSERT (! unresolved_reloc); 2966 bfd_put_64 (output_bfd, -tpoff (info, relocation), 2967 contents + rel->r_offset); 2968 continue; 2969 } 2970 2971 if (htab->elf.sgot == NULL) 2972 abort (); 2973 2974 if (h != NULL) 2975 off = h->got.offset; 2976 else 2977 { 2978 if (local_got_offsets == NULL) 2979 abort (); 2980 2981 off = local_got_offsets[r_symndx]; 2982 } 2983 2984 emit_tls_relocs: 2985 2986 if ((off & 1) != 0) 2987 off &= ~1; 2988 else 2989 { 2990 Elf_Internal_Rela outrel; 2991 bfd_byte *loc; 2992 int dr_type, indx; 2993 2994 if (htab->elf.srelgot == NULL) 2995 abort (); 2996 2997 outrel.r_offset = (htab->elf.sgot->output_section->vma 2998 + htab->elf.sgot->output_offset + off); 2999 3000 indx = h && h->dynindx != -1 ? h->dynindx : 0; 3001 if (r_type == R_390_TLS_GD64) 3002 dr_type = R_390_TLS_DTPMOD; 3003 else 3004 dr_type = R_390_TLS_TPOFF; 3005 if (dr_type == R_390_TLS_TPOFF && indx == 0) 3006 outrel.r_addend = relocation - dtpoff_base (info); 3007 else 3008 outrel.r_addend = 0; 3009 outrel.r_info = ELF64_R_INFO (indx, dr_type); 3010 loc = htab->elf.srelgot->contents; 3011 loc += htab->elf.srelgot->reloc_count++ 3012 * sizeof (Elf64_External_Rela); 3013 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 3014 3015 if (r_type == R_390_TLS_GD64) 3016 { 3017 if (indx == 0) 3018 { 3019 BFD_ASSERT (! unresolved_reloc); 3020 bfd_put_64 (output_bfd, 3021 relocation - dtpoff_base (info), 3022 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3023 } 3024 else 3025 { 3026 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF); 3027 outrel.r_offset += GOT_ENTRY_SIZE; 3028 outrel.r_addend = 0; 3029 htab->elf.srelgot->reloc_count++; 3030 loc += sizeof (Elf64_External_Rela); 3031 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 3032 } 3033 } 3034 3035 if (h != NULL) 3036 h->got.offset |= 1; 3037 else 3038 local_got_offsets[r_symndx] |= 1; 3039 } 3040 3041 if (off >= (bfd_vma) -2) 3042 abort (); 3043 if (r_type == ELF64_R_TYPE (rel->r_info)) 3044 { 3045 relocation = htab->elf.sgot->output_offset + off; 3046 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT) 3047 relocation += htab->elf.sgot->output_section->vma; 3048 unresolved_reloc = FALSE; 3049 } 3050 else 3051 { 3052 bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off, 3053 contents + rel->r_offset); 3054 continue; 3055 } 3056 break; 3057 3058 case R_390_TLS_GOTIE12: 3059 case R_390_TLS_GOTIE20: 3060 case R_390_TLS_IEENT: 3061 if (h == NULL) 3062 { 3063 if (local_got_offsets == NULL) 3064 abort(); 3065 off = local_got_offsets[r_symndx]; 3066 if (bfd_link_pic (info)) 3067 goto emit_tls_relocs; 3068 } 3069 else 3070 { 3071 off = h->got.offset; 3072 tls_type = elf_s390_hash_entry(h)->tls_type; 3073 if (bfd_link_pic (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE) 3074 goto emit_tls_relocs; 3075 } 3076 3077 if (htab->elf.sgot == NULL) 3078 abort (); 3079 3080 BFD_ASSERT (! unresolved_reloc); 3081 bfd_put_64 (output_bfd, -tpoff (info, relocation), 3082 htab->elf.sgot->contents + off); 3083 relocation = htab->elf.sgot->output_offset + off; 3084 if (r_type == R_390_TLS_IEENT) 3085 relocation += htab->elf.sgot->output_section->vma; 3086 unresolved_reloc = FALSE; 3087 break; 3088 3089 case R_390_TLS_LDM64: 3090 if (! bfd_link_pic (info)) 3091 /* The literal pool entry this relocation refers to gets ignored 3092 by the optimized code of the local exec model. Do nothing 3093 and the value will turn out zero. */ 3094 continue; 3095 3096 if (htab->elf.sgot == NULL) 3097 abort (); 3098 3099 off = htab->tls_ldm_got.offset; 3100 if (off & 1) 3101 off &= ~1; 3102 else 3103 { 3104 Elf_Internal_Rela outrel; 3105 bfd_byte *loc; 3106 3107 if (htab->elf.srelgot == NULL) 3108 abort (); 3109 3110 outrel.r_offset = (htab->elf.sgot->output_section->vma 3111 + htab->elf.sgot->output_offset + off); 3112 3113 bfd_put_64 (output_bfd, 0, 3114 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3115 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD); 3116 outrel.r_addend = 0; 3117 loc = htab->elf.srelgot->contents; 3118 loc += htab->elf.srelgot->reloc_count++ 3119 * sizeof (Elf64_External_Rela); 3120 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 3121 htab->tls_ldm_got.offset |= 1; 3122 } 3123 relocation = htab->elf.sgot->output_offset + off; 3124 unresolved_reloc = FALSE; 3125 break; 3126 3127 case R_390_TLS_LE64: 3128 if (bfd_link_dll (info)) 3129 { 3130 /* Linking a shared library with non-fpic code requires 3131 a R_390_TLS_TPOFF relocation. */ 3132 Elf_Internal_Rela outrel; 3133 asection *sreloc; 3134 bfd_byte *loc; 3135 int indx; 3136 3137 outrel.r_offset = rel->r_offset 3138 + input_section->output_section->vma 3139 + input_section->output_offset; 3140 if (h != NULL && h->dynindx != -1) 3141 indx = h->dynindx; 3142 else 3143 indx = 0; 3144 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF); 3145 if (indx == 0) 3146 outrel.r_addend = relocation - dtpoff_base (info); 3147 else 3148 outrel.r_addend = 0; 3149 sreloc = elf_section_data (input_section)->sreloc; 3150 if (sreloc == NULL) 3151 abort (); 3152 loc = sreloc->contents; 3153 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 3154 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 3155 } 3156 else 3157 { 3158 BFD_ASSERT (! unresolved_reloc); 3159 bfd_put_64 (output_bfd, -tpoff (info, relocation), 3160 contents + rel->r_offset); 3161 } 3162 continue; 3163 3164 case R_390_TLS_LDO64: 3165 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING)) 3166 relocation -= dtpoff_base (info); 3167 else 3168 /* When converting LDO to LE, we must negate. */ 3169 relocation = -tpoff (info, relocation); 3170 break; 3171 3172 /* Relocations for tls instructions. */ 3173 case R_390_TLS_LOAD: 3174 case R_390_TLS_GDCALL: 3175 case R_390_TLS_LDCALL: 3176 tls_type = GOT_UNKNOWN; 3177 if (h == NULL && local_got_offsets) 3178 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 3179 else if (h != NULL) 3180 tls_type = elf_s390_hash_entry(h)->tls_type; 3181 3182 if (tls_type == GOT_TLS_GD) 3183 continue; 3184 3185 if (r_type == R_390_TLS_LOAD) 3186 { 3187 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) 3188 { 3189 /* IE->LE transition. Four valid cases: 3190 lg %rx,(0,%ry) -> sllg %rx,%ry,0 3191 lg %rx,(%ry,0) -> sllg %rx,%ry,0 3192 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 3193 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */ 3194 unsigned int insn0, insn1, ry; 3195 3196 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 3197 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3198 if (insn1 != 0x0004) 3199 invalid_tls_insn (input_bfd, input_section, rel); 3200 ry = 0; 3201 if ((insn0 & 0xff00f000) == 0xe3000000) 3202 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */ 3203 ry = (insn0 & 0x000f0000); 3204 else if ((insn0 & 0xff0f0000) == 0xe3000000) 3205 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */ 3206 ry = (insn0 & 0x0000f000) << 4; 3207 else if ((insn0 & 0xff00f000) == 0xe300c000) 3208 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */ 3209 ry = (insn0 & 0x000f0000); 3210 else if ((insn0 & 0xff0f0000) == 0xe30c0000) 3211 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */ 3212 ry = (insn0 & 0x0000f000) << 4; 3213 else 3214 invalid_tls_insn (input_bfd, input_section, rel); 3215 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry; 3216 insn1 = 0x000d; 3217 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3218 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3219 } 3220 } 3221 else if (r_type == R_390_TLS_GDCALL) 3222 { 3223 unsigned int insn0, insn1; 3224 3225 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 3226 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3227 if ((insn0 & 0xffff0000) != 0xc0e50000) 3228 invalid_tls_insn (input_bfd, input_section, rel); 3229 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) 3230 { 3231 /* GD->LE transition. 3232 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 3233 insn0 = 0xc0040000; 3234 insn1 = 0x0000; 3235 } 3236 else 3237 { 3238 /* GD->IE transition. 3239 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */ 3240 insn0 = 0xe322c000; 3241 insn1 = 0x0004; 3242 } 3243 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3244 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3245 } 3246 else if (r_type == R_390_TLS_LDCALL) 3247 { 3248 if (!bfd_link_pic (info)) 3249 { 3250 unsigned int insn0, insn1; 3251 3252 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset); 3253 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4); 3254 if ((insn0 & 0xffff0000) != 0xc0e50000) 3255 invalid_tls_insn (input_bfd, input_section, rel); 3256 /* LD->LE transition. 3257 brasl %r14,__tls_get_addr@plt -> brcl 0,. */ 3258 insn0 = 0xc0040000; 3259 insn1 = 0x0000; 3260 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset); 3261 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4); 3262 } 3263 } 3264 continue; 3265 3266 default: 3267 break; 3268 } 3269 3270 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3271 because such sections are not SEC_ALLOC and thus ld.so will 3272 not process them. */ 3273 if (unresolved_reloc 3274 && !((input_section->flags & SEC_DEBUGGING) != 0 3275 && h->def_dynamic) 3276 && _bfd_elf_section_offset (output_bfd, info, input_section, 3277 rel->r_offset) != (bfd_vma) -1) 3278 _bfd_error_handler 3279 /* xgettext:c-format */ 3280 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3281 input_bfd, 3282 input_section, 3283 (long) rel->r_offset, 3284 howto->name, 3285 h->root.root.string); 3286 3287 do_relocation: 3288 3289 /* When applying a 24 bit reloc we need to start one byte 3290 earlier. Otherwise the 32 bit get/put bfd operations might 3291 access a byte after the actual section. */ 3292 if (r_type == R_390_PC24DBL 3293 || r_type == R_390_PLT24DBL) 3294 rel->r_offset--; 3295 3296 if (r_type == R_390_20 3297 || r_type == R_390_GOT20 3298 || r_type == R_390_GOTPLT20 3299 || r_type == R_390_TLS_GOTIE20) 3300 { 3301 relocation += rel->r_addend; 3302 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3303 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3304 contents, rel->r_offset, 3305 relocation, 0); 3306 } 3307 else 3308 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3309 contents, rel->r_offset, 3310 relocation, rel->r_addend); 3311 3312 if (r != bfd_reloc_ok) 3313 { 3314 const char *name; 3315 3316 if (h != NULL) 3317 name = h->root.root.string; 3318 else 3319 { 3320 name = bfd_elf_string_from_elf_section (input_bfd, 3321 symtab_hdr->sh_link, 3322 sym->st_name); 3323 if (name == NULL) 3324 return FALSE; 3325 if (*name == '\0') 3326 name = bfd_section_name (input_bfd, sec); 3327 } 3328 3329 if (r == bfd_reloc_overflow) 3330 (*info->callbacks->reloc_overflow) 3331 (info, (h ? &h->root : NULL), name, howto->name, 3332 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3333 else 3334 { 3335 _bfd_error_handler 3336 /* xgettext:c-format */ 3337 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3338 input_bfd, input_section, 3339 (long) rel->r_offset, name, (int) r); 3340 return FALSE; 3341 } 3342 } 3343 } 3344 3345 return TRUE; 3346 } 3347 3348 /* Generate the PLT slots together with the dynamic relocations needed 3349 for IFUNC symbols. */ 3350 3351 static void 3352 elf_s390_finish_ifunc_symbol (bfd *output_bfd, 3353 struct bfd_link_info *info, 3354 struct elf_link_hash_entry *h, 3355 struct elf_s390_link_hash_table *htab, 3356 bfd_vma plt_offset, 3357 bfd_vma resolver_address) 3358 { 3359 bfd_vma plt_index; 3360 bfd_vma got_offset; 3361 Elf_Internal_Rela rela; 3362 bfd_byte *loc; 3363 asection *plt, *gotplt, *relplt; 3364 3365 if (htab->elf.iplt == NULL 3366 || htab->elf.igotplt == NULL 3367 || htab->elf.irelplt == NULL) 3368 abort (); 3369 3370 /* Index of the PLT slot within iplt section. */ 3371 plt_index = plt_offset / PLT_ENTRY_SIZE; 3372 plt = htab->elf.iplt; 3373 /* Offset into the igot.plt section. */ 3374 got_offset = plt_index * GOT_ENTRY_SIZE; 3375 gotplt = htab->elf.igotplt; 3376 relplt = htab->elf.irelplt; 3377 3378 /* Fill in the blueprint of a PLT. */ 3379 memcpy (plt->contents + plt_offset, elf_s390x_plt_entry, 3380 PLT_ENTRY_SIZE); 3381 3382 /* Fixup the relative address to the GOT entry */ 3383 bfd_put_32 (output_bfd, 3384 (gotplt->output_section->vma + 3385 gotplt->output_offset + got_offset 3386 - (plt->output_section->vma + 3387 plt->output_offset + 3388 plt_offset))/2, 3389 plt->contents + plt_offset + 2); 3390 /* Fixup the relative branch to PLT 0 */ 3391 bfd_put_32 (output_bfd, - (plt->output_offset + 3392 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3393 plt->contents + plt_offset + 24); 3394 /* Fixup offset into .rela.plt section. */ 3395 bfd_put_32 (output_bfd, relplt->output_offset + 3396 plt_index * sizeof (Elf64_External_Rela), 3397 plt->contents + plt_offset + 28); 3398 3399 /* Fill in the entry in the global offset table. 3400 Points to instruction after GOT offset. */ 3401 bfd_put_64 (output_bfd, 3402 (plt->output_section->vma 3403 + plt->output_offset 3404 + plt_offset 3405 + 14), 3406 gotplt->contents + got_offset); 3407 3408 /* Fill in the entry in the .rela.plt section. */ 3409 rela.r_offset = (gotplt->output_section->vma 3410 + gotplt->output_offset 3411 + got_offset); 3412 3413 if (!h 3414 || h->dynindx == -1 3415 || ((bfd_link_executable (info) 3416 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3417 && h->def_regular)) 3418 { 3419 /* The symbol can be locally resolved. */ 3420 rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE); 3421 rela.r_addend = resolver_address; 3422 } 3423 else 3424 { 3425 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3426 rela.r_addend = 0; 3427 } 3428 3429 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela); 3430 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3431 } 3432 3433 3434 /* Finish up dynamic symbol handling. We set the contents of various 3435 dynamic sections here. */ 3436 3437 static bfd_boolean 3438 elf_s390_finish_dynamic_symbol (bfd *output_bfd, 3439 struct bfd_link_info *info, 3440 struct elf_link_hash_entry *h, 3441 Elf_Internal_Sym *sym) 3442 { 3443 struct elf_s390_link_hash_table *htab; 3444 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; 3445 3446 htab = elf_s390_hash_table (info); 3447 if (htab == NULL) 3448 return FALSE; 3449 3450 if (h->plt.offset != (bfd_vma) -1) 3451 { 3452 bfd_vma plt_index; 3453 bfd_vma got_offset; 3454 Elf_Internal_Rela rela; 3455 bfd_byte *loc; 3456 3457 /* This symbol has an entry in the procedure linkage table. Set 3458 it up. */ 3459 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 3460 { 3461 elf_s390_finish_ifunc_symbol (output_bfd, info, h, 3462 htab, h->plt.offset, 3463 eh->ifunc_resolver_address + 3464 eh->ifunc_resolver_section->output_offset + 3465 eh->ifunc_resolver_section->output_section->vma); 3466 3467 /* Do not return yet. Handling of explicit GOT slots of 3468 IFUNC symbols is below. */ 3469 } 3470 else 3471 { 3472 if (h->dynindx == -1 3473 || htab->elf.splt == NULL 3474 || htab->elf.sgotplt == NULL 3475 || htab->elf.srelplt == NULL) 3476 abort (); 3477 3478 /* Calc. index no. 3479 Current offset - size first entry / entry size. */ 3480 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3481 3482 /* Offset in GOT is PLT index plus GOT headers(3) times 8, 3483 addr & GOT addr. */ 3484 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3485 3486 /* Fill in the blueprint of a PLT. */ 3487 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry, 3488 PLT_ENTRY_SIZE); 3489 3490 /* Fixup the relative address to the GOT entry */ 3491 bfd_put_32 (output_bfd, 3492 (htab->elf.sgotplt->output_section->vma + 3493 htab->elf.sgotplt->output_offset + got_offset 3494 - (htab->elf.splt->output_section->vma + 3495 htab->elf.splt->output_offset + 3496 h->plt.offset))/2, 3497 htab->elf.splt->contents + h->plt.offset + 2); 3498 /* Fixup the relative branch to PLT 0 */ 3499 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE + 3500 (PLT_ENTRY_SIZE * plt_index) + 22)/2, 3501 htab->elf.splt->contents + h->plt.offset + 24); 3502 /* Fixup offset into .rela.plt section. */ 3503 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela), 3504 htab->elf.splt->contents + h->plt.offset + 28); 3505 3506 /* Fill in the entry in the global offset table. 3507 Points to instruction after GOT offset. */ 3508 bfd_put_64 (output_bfd, 3509 (htab->elf.splt->output_section->vma 3510 + htab->elf.splt->output_offset 3511 + h->plt.offset 3512 + 14), 3513 htab->elf.sgotplt->contents + got_offset); 3514 3515 /* Fill in the entry in the .rela.plt section. */ 3516 rela.r_offset = (htab->elf.sgotplt->output_section->vma 3517 + htab->elf.sgotplt->output_offset 3518 + got_offset); 3519 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT); 3520 rela.r_addend = 0; 3521 loc = htab->elf.srelplt->contents + plt_index * 3522 sizeof (Elf64_External_Rela); 3523 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3524 3525 if (!h->def_regular) 3526 { 3527 /* Mark the symbol as undefined, rather than as defined in 3528 the .plt section. Leave the value alone. This is a clue 3529 for the dynamic linker, to make function pointer 3530 comparisons work between an application and shared 3531 library. */ 3532 sym->st_shndx = SHN_UNDEF; 3533 } 3534 } 3535 } 3536 3537 if (h->got.offset != (bfd_vma) -1 3538 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3539 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3540 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3541 { 3542 Elf_Internal_Rela rela; 3543 bfd_byte *loc; 3544 3545 /* This symbol has an entry in the global offset table. Set it 3546 up. */ 3547 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3548 abort (); 3549 3550 rela.r_offset = (htab->elf.sgot->output_section->vma 3551 + htab->elf.sgot->output_offset 3552 + (h->got.offset &~ (bfd_vma) 1)); 3553 3554 if (h->def_regular && s390_is_ifunc_symbol_p (h)) 3555 { 3556 if (bfd_link_pic (info)) 3557 { 3558 /* An explicit GOT slot usage needs GLOB_DAT. If the 3559 symbol references local the implicit got.iplt slot 3560 will be used and the IRELATIVE reloc has been created 3561 above. */ 3562 goto do_glob_dat; 3563 } 3564 else 3565 { 3566 /* For non-shared objects explicit GOT slots must be 3567 filled with the PLT slot address for pointer 3568 equality reasons. */ 3569 bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma 3570 + htab->elf.iplt->output_offset 3571 + h->plt.offset), 3572 htab->elf.sgot->contents + h->got.offset); 3573 return TRUE; 3574 } 3575 } 3576 else if (bfd_link_pic (info) 3577 && SYMBOL_REFERENCES_LOCAL (info, h)) 3578 { 3579 /* If this is a static link, or it is a -Bsymbolic link and 3580 the symbol is defined locally or was forced to be local 3581 because of a version file, we just want to emit a 3582 RELATIVE reloc. The entry in the global offset table 3583 will already have been initialized in the 3584 relocate_section function. */ 3585 if (!(h->def_regular || ELF_COMMON_DEF_P (h))) 3586 return FALSE; 3587 BFD_ASSERT((h->got.offset & 1) != 0); 3588 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE); 3589 rela.r_addend = (h->root.u.def.value 3590 + h->root.u.def.section->output_section->vma 3591 + h->root.u.def.section->output_offset); 3592 } 3593 else 3594 { 3595 BFD_ASSERT((h->got.offset & 1) == 0); 3596 do_glob_dat: 3597 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset); 3598 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT); 3599 rela.r_addend = 0; 3600 } 3601 3602 loc = htab->elf.srelgot->contents; 3603 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3604 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3605 } 3606 3607 if (h->needs_copy) 3608 { 3609 Elf_Internal_Rela rela; 3610 asection *s; 3611 bfd_byte *loc; 3612 3613 /* This symbols needs a copy reloc. Set it up. */ 3614 3615 if (h->dynindx == -1 3616 || (h->root.type != bfd_link_hash_defined 3617 && h->root.type != bfd_link_hash_defweak) 3618 || htab->elf.srelbss == NULL) 3619 abort (); 3620 3621 rela.r_offset = (h->root.u.def.value 3622 + h->root.u.def.section->output_section->vma 3623 + h->root.u.def.section->output_offset); 3624 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY); 3625 rela.r_addend = 0; 3626 if (h->root.u.def.section == htab->elf.sdynrelro) 3627 s = htab->elf.sreldynrelro; 3628 else 3629 s = htab->elf.srelbss; 3630 loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela); 3631 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3632 } 3633 3634 /* Mark some specially defined symbols as absolute. */ 3635 if (h == htab->elf.hdynamic 3636 || h == htab->elf.hgot 3637 || h == htab->elf.hplt) 3638 sym->st_shndx = SHN_ABS; 3639 3640 return TRUE; 3641 } 3642 3643 /* Used to decide how to sort relocs in an optimal manner for the 3644 dynamic linker, before writing them out. */ 3645 3646 static enum elf_reloc_type_class 3647 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3648 const asection *rel_sec ATTRIBUTE_UNUSED, 3649 const Elf_Internal_Rela *rela) 3650 { 3651 bfd *abfd = info->output_bfd; 3652 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3653 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); 3654 unsigned long r_symndx = ELF64_R_SYM (rela->r_info); 3655 Elf_Internal_Sym sym; 3656 3657 if (htab->elf.dynsym == NULL 3658 || !bed->s->swap_symbol_in (abfd, 3659 (htab->elf.dynsym->contents 3660 + r_symndx * bed->s->sizeof_sym), 3661 0, &sym)) 3662 abort (); 3663 3664 /* Check relocation against STT_GNU_IFUNC symbol. */ 3665 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 3666 return reloc_class_ifunc; 3667 3668 switch ((int) ELF64_R_TYPE (rela->r_info)) 3669 { 3670 case R_390_RELATIVE: 3671 return reloc_class_relative; 3672 case R_390_JMP_SLOT: 3673 return reloc_class_plt; 3674 case R_390_COPY: 3675 return reloc_class_copy; 3676 default: 3677 return reloc_class_normal; 3678 } 3679 } 3680 3681 /* Finish up the dynamic sections. */ 3682 3683 static bfd_boolean 3684 elf_s390_finish_dynamic_sections (bfd *output_bfd, 3685 struct bfd_link_info *info) 3686 { 3687 struct elf_s390_link_hash_table *htab; 3688 bfd *dynobj; 3689 asection *sdyn; 3690 bfd *ibfd; 3691 unsigned int i; 3692 3693 htab = elf_s390_hash_table (info); 3694 if (htab == NULL) 3695 return FALSE; 3696 3697 dynobj = htab->elf.dynobj; 3698 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3699 3700 if (htab->elf.dynamic_sections_created) 3701 { 3702 Elf64_External_Dyn *dyncon, *dynconend; 3703 3704 if (sdyn == NULL || htab->elf.sgot == NULL) 3705 abort (); 3706 3707 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3708 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 3709 for (; dyncon < dynconend; dyncon++) 3710 { 3711 Elf_Internal_Dyn dyn; 3712 asection *s; 3713 3714 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3715 3716 switch (dyn.d_tag) 3717 { 3718 default: 3719 continue; 3720 3721 case DT_PLTGOT: 3722 s = htab->elf.sgotplt; 3723 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3724 break; 3725 3726 case DT_JMPREL: 3727 s = htab->elf.srelplt; 3728 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3729 break; 3730 3731 case DT_PLTRELSZ: 3732 dyn.d_un.d_val = htab->elf.srelplt->size + htab->elf.irelplt->size; 3733 break; 3734 3735 case DT_RELASZ: 3736 /* The procedure linkage table relocs (DT_JMPREL) should 3737 not be included in the overall relocs (DT_RELA). 3738 Therefore, we override the DT_RELASZ entry here to 3739 make it not include the JMPREL relocs. Since the 3740 linker script arranges for .rela.plt to follow all 3741 other relocation sections, we don't have to worry 3742 about changing the DT_RELA entry. */ 3743 dyn.d_un.d_val -= htab->elf.srelplt->size + htab->elf.irelplt->size; 3744 break; 3745 } 3746 3747 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3748 } 3749 3750 /* Fill in the special first entry in the procedure linkage table. */ 3751 if (htab->elf.splt && htab->elf.splt->size > 0) 3752 { 3753 /* fill in blueprint for plt 0 entry */ 3754 memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry, 3755 PLT_FIRST_ENTRY_SIZE); 3756 /* Fixup relative address to start of GOT */ 3757 bfd_put_32 (output_bfd, 3758 (htab->elf.sgotplt->output_section->vma 3759 + htab->elf.sgotplt->output_offset 3760 - htab->elf.splt->output_section->vma 3761 - htab->elf.splt->output_offset - 6)/2, 3762 htab->elf.splt->contents + 8); 3763 } 3764 if (elf_section_data (htab->elf.splt->output_section) != NULL) 3765 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize 3766 = PLT_ENTRY_SIZE; 3767 } 3768 3769 if (htab->elf.sgotplt) 3770 { 3771 /* Fill in the first three entries in the global offset table. */ 3772 if (htab->elf.sgotplt->size > 0) 3773 { 3774 bfd_put_64 (output_bfd, 3775 (sdyn == NULL ? (bfd_vma) 0 3776 : sdyn->output_section->vma + sdyn->output_offset), 3777 htab->elf.sgotplt->contents); 3778 /* One entry for shared object struct ptr. */ 3779 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8); 3780 /* One entry for _dl_runtime_resolve. */ 3781 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 16); 3782 } 3783 3784 elf_section_data (htab->elf.sgot->output_section) 3785 ->this_hdr.sh_entsize = 8; 3786 } 3787 3788 /* Finish dynamic symbol for local IFUNC symbols. */ 3789 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 3790 { 3791 struct plt_entry *local_plt; 3792 Elf_Internal_Sym *isym; 3793 Elf_Internal_Shdr *symtab_hdr; 3794 3795 symtab_hdr = &elf_symtab_hdr (ibfd); 3796 3797 local_plt = elf_s390_local_plt (ibfd); 3798 if (local_plt != NULL) 3799 for (i = 0; i < symtab_hdr->sh_info; i++) 3800 { 3801 if (local_plt[i].plt.offset != (bfd_vma) -1) 3802 { 3803 asection *sec = local_plt[i].sec; 3804 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i); 3805 if (isym == NULL) 3806 return FALSE; 3807 3808 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 3809 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab, 3810 local_plt[i].plt.offset, 3811 isym->st_value 3812 + sec->output_section->vma 3813 + sec->output_offset); 3814 3815 } 3816 } 3817 } 3818 3819 return TRUE; 3820 } 3821 3822 /* Support for core dump NOTE sections. */ 3824 3825 static bfd_boolean 3826 elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 3827 { 3828 int offset; 3829 size_t size; 3830 3831 switch (note->descsz) 3832 { 3833 default: 3834 return FALSE; 3835 3836 case 336: /* sizeof(struct elf_prstatus) on s390x */ 3837 /* pr_cursig */ 3838 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 3839 3840 /* pr_pid */ 3841 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32); 3842 3843 /* pr_reg */ 3844 offset = 112; 3845 size = 216; 3846 break; 3847 } 3848 3849 /* Make a ".reg/999" section. */ 3850 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3851 size, note->descpos + offset); 3852 } 3853 3854 static bfd_boolean 3855 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 3856 { 3857 switch (note->descsz) 3858 { 3859 default: 3860 return FALSE; 3861 3862 case 136: /* sizeof(struct elf_prpsinfo) on s390x */ 3863 elf_tdata (abfd)->core->pid 3864 = bfd_get_32 (abfd, note->descdata + 24); 3865 elf_tdata (abfd)->core->program 3866 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 3867 elf_tdata (abfd)->core->command 3868 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 3869 } 3870 3871 /* Note that for some reason, a spurious space is tacked 3872 onto the end of the args in some (at least one anyway) 3873 implementations, so strip it off if it exists. */ 3874 3875 { 3876 char *command = elf_tdata (abfd)->core->command; 3877 int n = strlen (command); 3878 3879 if (0 < n && command[n - 1] == ' ') 3880 command[n - 1] = '\0'; 3881 } 3882 3883 return TRUE; 3884 } 3885 3886 static char * 3887 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz, 3888 int note_type, ...) 3889 { 3890 va_list ap; 3891 3892 switch (note_type) 3893 { 3894 default: 3895 return NULL; 3896 3897 case NT_PRPSINFO: 3898 { 3899 char data[136] = { 0 }; 3900 const char *fname, *psargs; 3901 3902 va_start (ap, note_type); 3903 fname = va_arg (ap, const char *); 3904 psargs = va_arg (ap, const char *); 3905 va_end (ap); 3906 3907 strncpy (data + 40, fname, 16); 3908 strncpy (data + 56, psargs, 80); 3909 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3910 &data, sizeof (data)); 3911 } 3912 3913 case NT_PRSTATUS: 3914 { 3915 char data[336] = { 0 }; 3916 long pid; 3917 int cursig; 3918 const void *gregs; 3919 3920 va_start (ap, note_type); 3921 pid = va_arg (ap, long); 3922 cursig = va_arg (ap, int); 3923 gregs = va_arg (ap, const void *); 3924 va_end (ap); 3925 3926 bfd_put_16 (abfd, cursig, data + 12); 3927 bfd_put_32 (abfd, pid, data + 32); 3928 memcpy (data + 112, gregs, 216); 3929 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 3930 &data, sizeof (data)); 3931 } 3932 } 3933 /* NOTREACHED */ 3934 } 3935 3936 /* Return address for Ith PLT stub in section PLT, for relocation REL 3938 or (bfd_vma) -1 if it should not be included. */ 3939 3940 static bfd_vma 3941 elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3942 const arelent *rel ATTRIBUTE_UNUSED) 3943 { 3944 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3945 } 3946 3947 /* Merge backend specific data from an object file to the output 3948 object file when linking. */ 3949 3950 static bfd_boolean 3951 elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 3952 { 3953 if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd)) 3954 return TRUE; 3955 3956 return elf_s390_merge_obj_attributes (ibfd, info); 3957 } 3958 3959 /* Why was the hash table entry size definition changed from 3960 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and 3961 this is the only reason for the s390_elf64_size_info structure. */ 3962 3963 const struct elf_size_info s390_elf64_size_info = 3964 { 3965 sizeof (Elf64_External_Ehdr), 3966 sizeof (Elf64_External_Phdr), 3967 sizeof (Elf64_External_Shdr), 3968 sizeof (Elf64_External_Rel), 3969 sizeof (Elf64_External_Rela), 3970 sizeof (Elf64_External_Sym), 3971 sizeof (Elf64_External_Dyn), 3972 sizeof (Elf_External_Note), 3973 8, /* hash-table entry size. */ 3974 1, /* internal relocations per external relocations. */ 3975 64, /* arch_size. */ 3976 3, /* log_file_align. */ 3977 ELFCLASS64, EV_CURRENT, 3978 bfd_elf64_write_out_phdrs, 3979 bfd_elf64_write_shdrs_and_ehdr, 3980 bfd_elf64_checksum_contents, 3981 bfd_elf64_write_relocs, 3982 bfd_elf64_swap_symbol_in, 3983 bfd_elf64_swap_symbol_out, 3984 bfd_elf64_slurp_reloc_table, 3985 bfd_elf64_slurp_symbol_table, 3986 bfd_elf64_swap_dyn_in, 3987 bfd_elf64_swap_dyn_out, 3988 bfd_elf64_swap_reloc_in, 3989 bfd_elf64_swap_reloc_out, 3990 bfd_elf64_swap_reloca_in, 3991 bfd_elf64_swap_reloca_out 3992 }; 3993 3994 #define TARGET_BIG_SYM s390_elf64_vec 3995 #define TARGET_BIG_NAME "elf64-s390" 3996 #define ELF_ARCH bfd_arch_s390 3997 #define ELF_TARGET_ID S390_ELF_DATA 3998 #define ELF_MACHINE_CODE EM_S390 3999 #define ELF_MACHINE_ALT1 EM_S390_OLD 4000 #define ELF_MAXPAGESIZE 0x1000 4001 4002 #define elf_backend_size_info s390_elf64_size_info 4003 4004 #define elf_backend_can_gc_sections 1 4005 #define elf_backend_can_refcount 1 4006 #define elf_backend_want_got_plt 1 4007 #define elf_backend_plt_readonly 1 4008 #define elf_backend_want_plt_sym 0 4009 #define elf_backend_got_header_size 24 4010 #define elf_backend_want_dynrelro 1 4011 #define elf_backend_rela_normal 1 4012 4013 #define elf_info_to_howto elf_s390_info_to_howto 4014 4015 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name 4016 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create 4017 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 4018 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 4019 #define bfd_elf64_bfd_merge_private_bfd_data elf64_s390_merge_private_bfd_data 4020 4021 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 4022 #define elf_backend_check_relocs elf_s390_check_relocs 4023 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 4024 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 4025 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 4026 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 4027 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 4028 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 4029 #define elf_backend_reloc_type_class elf_s390_reloc_type_class 4030 #define elf_backend_relocate_section elf_s390_relocate_section 4031 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 4032 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4033 #define elf_backend_grok_prstatus elf_s390_grok_prstatus 4034 #define elf_backend_grok_psinfo elf_s390_grok_psinfo 4035 #define elf_backend_write_core_note elf_s390_write_core_note 4036 #define elf_backend_plt_sym_val elf_s390_plt_sym_val 4037 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook 4038 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p 4039 4040 #define bfd_elf64_mkobject elf_s390_mkobject 4041 #define elf_backend_object_p elf_s390_object_p 4042 4043 #include "elf64-target.h" 4044
Indexes created Thu Apr 30 00:23:01 UTC 2026