elf32-s390.c revision 1.1.1.1
1 /* IBM S/390-specific support for 32-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 3 2011, 2012 Free Software Foundation, Inc. 4 Contributed by Carl B. Pedersen and Martin Schwidefsky. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 21 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include "bfd.h" 25 #include "bfdlink.h" 26 #include "libbfd.h" 27 #include "elf-bfd.h" 28 #include "elf/s390.h" 29 30 static bfd_reloc_status_type 31 s390_tls_reloc (bfd *, arelent *, asymbol *, void *, 32 asection *, bfd *, char **); 33 static bfd_reloc_status_type 34 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *, 35 asection *, bfd *, char **); 36 37 /* The relocation "howto" table. */ 38 39 static reloc_howto_type elf_howto_table[] = 40 { 41 HOWTO (R_390_NONE, /* type */ 42 0, /* rightshift */ 43 0, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */ 44 0, /* bitsize */ 45 FALSE, /* pc_relative */ 46 0, /* bitpos */ 47 complain_overflow_dont, /* complain_on_overflow */ 48 bfd_elf_generic_reloc, /* special_function */ 49 "R_390_NONE", /* name */ 50 FALSE, /* partial_inplace */ 51 0, /* src_mask */ 52 0, /* dst_mask */ 53 FALSE), /* pcrel_offset */ 54 55 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 56 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE), 57 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 58 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE), 59 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE), 61 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 62 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE), 63 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 64 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE), 65 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield, 66 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE), 67 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 68 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE), 69 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 70 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE), 71 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 72 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE), 73 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 74 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE), 75 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 76 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE), 77 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 78 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE), 79 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 80 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE), 81 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 82 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE), 83 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 84 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE), 85 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE), 87 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 88 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE), 89 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield, 90 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE), 91 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE), 93 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 94 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE), 95 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 96 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE), 97 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */ 98 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */ 99 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */ 100 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */ 101 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 102 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE), 103 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 104 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE), 105 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */ 106 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 107 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE), 108 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 109 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE), 110 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 111 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE), 112 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */ 113 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 114 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE), 115 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 116 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE), 117 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 118 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE), 119 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */ 120 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont, 121 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE), 122 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 123 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE), 124 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 125 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE), 126 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE), 128 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */ 129 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont, 130 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE), 131 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 132 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE), 133 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */ 134 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 135 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE), 136 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */ 137 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 138 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE), 139 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */ 140 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield, 141 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE), 142 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 143 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE), 144 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */ 145 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 146 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE), 147 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */ 148 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 149 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE), 150 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 151 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE), 152 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 153 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE), 154 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 155 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE), 156 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 157 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE), 158 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 159 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE), 160 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont, 161 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE), 162 HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 163 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE), 164 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 165 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE), 166 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield, 167 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE), 168 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 169 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE), 170 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield, 171 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE), 172 }; 173 174 /* GNU extension to record C++ vtable hierarchy. */ 175 static reloc_howto_type elf32_s390_vtinherit_howto = 176 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE); 177 static reloc_howto_type elf32_s390_vtentry_howto = 178 HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE); 179 180 static reloc_howto_type * 181 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 182 bfd_reloc_code_real_type code) 183 { 184 switch (code) 185 { 186 case BFD_RELOC_NONE: 187 return &elf_howto_table[(int) R_390_NONE]; 188 case BFD_RELOC_8: 189 return &elf_howto_table[(int) R_390_8]; 190 case BFD_RELOC_390_12: 191 return &elf_howto_table[(int) R_390_12]; 192 case BFD_RELOC_16: 193 return &elf_howto_table[(int) R_390_16]; 194 case BFD_RELOC_32: 195 return &elf_howto_table[(int) R_390_32]; 196 case BFD_RELOC_CTOR: 197 return &elf_howto_table[(int) R_390_32]; 198 case BFD_RELOC_32_PCREL: 199 return &elf_howto_table[(int) R_390_PC32]; 200 case BFD_RELOC_390_GOT12: 201 return &elf_howto_table[(int) R_390_GOT12]; 202 case BFD_RELOC_32_GOT_PCREL: 203 return &elf_howto_table[(int) R_390_GOT32]; 204 case BFD_RELOC_390_PLT32: 205 return &elf_howto_table[(int) R_390_PLT32]; 206 case BFD_RELOC_390_COPY: 207 return &elf_howto_table[(int) R_390_COPY]; 208 case BFD_RELOC_390_GLOB_DAT: 209 return &elf_howto_table[(int) R_390_GLOB_DAT]; 210 case BFD_RELOC_390_JMP_SLOT: 211 return &elf_howto_table[(int) R_390_JMP_SLOT]; 212 case BFD_RELOC_390_RELATIVE: 213 return &elf_howto_table[(int) R_390_RELATIVE]; 214 case BFD_RELOC_32_GOTOFF: 215 return &elf_howto_table[(int) R_390_GOTOFF32]; 216 case BFD_RELOC_390_GOTPC: 217 return &elf_howto_table[(int) R_390_GOTPC]; 218 case BFD_RELOC_390_GOT16: 219 return &elf_howto_table[(int) R_390_GOT16]; 220 case BFD_RELOC_16_PCREL: 221 return &elf_howto_table[(int) R_390_PC16]; 222 case BFD_RELOC_390_PC12DBL: 223 return &elf_howto_table[(int) R_390_PC12DBL]; 224 case BFD_RELOC_390_PLT12DBL: 225 return &elf_howto_table[(int) R_390_PLT12DBL]; 226 case BFD_RELOC_390_PC16DBL: 227 return &elf_howto_table[(int) R_390_PC16DBL]; 228 case BFD_RELOC_390_PLT16DBL: 229 return &elf_howto_table[(int) R_390_PLT16DBL]; 230 case BFD_RELOC_390_PC24DBL: 231 return &elf_howto_table[(int) R_390_PC24DBL]; 232 case BFD_RELOC_390_PLT24DBL: 233 return &elf_howto_table[(int) R_390_PLT24DBL]; 234 case BFD_RELOC_390_PC32DBL: 235 return &elf_howto_table[(int) R_390_PC32DBL]; 236 case BFD_RELOC_390_PLT32DBL: 237 return &elf_howto_table[(int) R_390_PLT32DBL]; 238 case BFD_RELOC_390_GOTPCDBL: 239 return &elf_howto_table[(int) R_390_GOTPCDBL]; 240 case BFD_RELOC_390_GOTENT: 241 return &elf_howto_table[(int) R_390_GOTENT]; 242 case BFD_RELOC_16_GOTOFF: 243 return &elf_howto_table[(int) R_390_GOTOFF16]; 244 case BFD_RELOC_390_GOTPLT12: 245 return &elf_howto_table[(int) R_390_GOTPLT12]; 246 case BFD_RELOC_390_GOTPLT16: 247 return &elf_howto_table[(int) R_390_GOTPLT16]; 248 case BFD_RELOC_390_GOTPLT32: 249 return &elf_howto_table[(int) R_390_GOTPLT32]; 250 case BFD_RELOC_390_GOTPLTENT: 251 return &elf_howto_table[(int) R_390_GOTPLTENT]; 252 case BFD_RELOC_390_PLTOFF16: 253 return &elf_howto_table[(int) R_390_PLTOFF16]; 254 case BFD_RELOC_390_PLTOFF32: 255 return &elf_howto_table[(int) R_390_PLTOFF32]; 256 case BFD_RELOC_390_TLS_LOAD: 257 return &elf_howto_table[(int) R_390_TLS_LOAD]; 258 case BFD_RELOC_390_TLS_GDCALL: 259 return &elf_howto_table[(int) R_390_TLS_GDCALL]; 260 case BFD_RELOC_390_TLS_LDCALL: 261 return &elf_howto_table[(int) R_390_TLS_LDCALL]; 262 case BFD_RELOC_390_TLS_GD32: 263 return &elf_howto_table[(int) R_390_TLS_GD32]; 264 case BFD_RELOC_390_TLS_GOTIE12: 265 return &elf_howto_table[(int) R_390_TLS_GOTIE12]; 266 case BFD_RELOC_390_TLS_GOTIE32: 267 return &elf_howto_table[(int) R_390_TLS_GOTIE32]; 268 case BFD_RELOC_390_TLS_LDM32: 269 return &elf_howto_table[(int) R_390_TLS_LDM32]; 270 case BFD_RELOC_390_TLS_IE32: 271 return &elf_howto_table[(int) R_390_TLS_IE32]; 272 case BFD_RELOC_390_TLS_IEENT: 273 return &elf_howto_table[(int) R_390_TLS_IEENT]; 274 case BFD_RELOC_390_TLS_LE32: 275 return &elf_howto_table[(int) R_390_TLS_LE32]; 276 case BFD_RELOC_390_TLS_LDO32: 277 return &elf_howto_table[(int) R_390_TLS_LDO32]; 278 case BFD_RELOC_390_TLS_DTPMOD: 279 return &elf_howto_table[(int) R_390_TLS_DTPMOD]; 280 case BFD_RELOC_390_TLS_DTPOFF: 281 return &elf_howto_table[(int) R_390_TLS_DTPOFF]; 282 case BFD_RELOC_390_TLS_TPOFF: 283 return &elf_howto_table[(int) R_390_TLS_TPOFF]; 284 case BFD_RELOC_390_20: 285 return &elf_howto_table[(int) R_390_20]; 286 case BFD_RELOC_390_GOT20: 287 return &elf_howto_table[(int) R_390_GOT20]; 288 case BFD_RELOC_390_GOTPLT20: 289 return &elf_howto_table[(int) R_390_GOTPLT20]; 290 case BFD_RELOC_390_TLS_GOTIE20: 291 return &elf_howto_table[(int) R_390_TLS_GOTIE20]; 292 case BFD_RELOC_390_IRELATIVE: 293 return &elf_howto_table[(int) R_390_IRELATIVE]; 294 case BFD_RELOC_VTABLE_INHERIT: 295 return &elf32_s390_vtinherit_howto; 296 case BFD_RELOC_VTABLE_ENTRY: 297 return &elf32_s390_vtentry_howto; 298 default: 299 break; 300 } 301 return 0; 302 } 303 304 static reloc_howto_type * 305 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 306 const char *r_name) 307 { 308 unsigned int i; 309 310 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 311 if (elf_howto_table[i].name != NULL 312 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 313 return &elf_howto_table[i]; 314 315 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0) 316 return &elf32_s390_vtinherit_howto; 317 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0) 318 return &elf32_s390_vtentry_howto; 319 320 return NULL; 321 } 322 323 /* We need to use ELF32_R_TYPE so we have our own copy of this function, 324 and elf32-s390.c has its own copy. */ 325 326 static void 327 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 328 arelent *cache_ptr, 329 Elf_Internal_Rela *dst) 330 { 331 unsigned int r_type = ELF32_R_TYPE(dst->r_info); 332 switch (r_type) 333 { 334 case R_390_GNU_VTINHERIT: 335 cache_ptr->howto = &elf32_s390_vtinherit_howto; 336 break; 337 338 case R_390_GNU_VTENTRY: 339 cache_ptr->howto = &elf32_s390_vtentry_howto; 340 break; 341 342 default: 343 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0])) 344 { 345 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 346 abfd, (int) r_type); 347 r_type = R_390_NONE; 348 } 349 cache_ptr->howto = &elf_howto_table[r_type]; 350 } 351 } 352 353 /* A relocation function which doesn't do anything. */ 354 static bfd_reloc_status_type 355 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED, 356 arelent *reloc_entry, 357 asymbol *symbol ATTRIBUTE_UNUSED, 358 void * data ATTRIBUTE_UNUSED, 359 asection *input_section, 360 bfd *output_bfd, 361 char **error_message ATTRIBUTE_UNUSED) 362 { 363 if (output_bfd) 364 reloc_entry->address += input_section->output_offset; 365 return bfd_reloc_ok; 366 } 367 368 /* Handle the large displacement relocs. */ 369 static bfd_reloc_status_type 370 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED, 371 arelent *reloc_entry, 372 asymbol *symbol, 373 void * data ATTRIBUTE_UNUSED, 374 asection *input_section, 375 bfd *output_bfd, 376 char **error_message ATTRIBUTE_UNUSED) 377 { 378 reloc_howto_type *howto = reloc_entry->howto; 379 bfd_vma relocation; 380 bfd_vma insn; 381 382 if (output_bfd != (bfd *) NULL 383 && (symbol->flags & BSF_SECTION_SYM) == 0 384 && (! howto->partial_inplace 385 || reloc_entry->addend == 0)) 386 { 387 reloc_entry->address += input_section->output_offset; 388 return bfd_reloc_ok; 389 } 390 391 if (output_bfd != NULL) 392 return bfd_reloc_continue; 393 394 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 395 return bfd_reloc_outofrange; 396 397 relocation = (symbol->value 398 + symbol->section->output_section->vma 399 + symbol->section->output_offset); 400 relocation += reloc_entry->addend; 401 if (howto->pc_relative) 402 { 403 relocation -= (input_section->output_section->vma 404 + input_section->output_offset); 405 relocation -= reloc_entry->address; 406 } 407 408 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 409 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4; 410 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); 411 412 if ((bfd_signed_vma) relocation < - 0x80000 413 || (bfd_signed_vma) relocation > 0x7ffff) 414 return bfd_reloc_overflow; 415 else 416 return bfd_reloc_ok; 417 } 418 419 static bfd_boolean 420 elf_s390_is_local_label_name (bfd *abfd, const char *name) 421 { 422 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L')) 423 return TRUE; 424 425 return _bfd_elf_is_local_label_name (abfd, name); 426 } 427 428 /* Functions for the 390 ELF linker. */ 429 430 /* The name of the dynamic interpreter. This is put in the .interp 431 section. */ 432 433 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 434 435 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 436 copying dynamic variables from a shared lib into an app's dynbss 437 section, and instead use a dynamic relocation to point into the 438 shared lib. */ 439 #define ELIMINATE_COPY_RELOCS 1 440 441 /* The size in bytes of the first entry in the procedure linkage table. */ 442 #define PLT_FIRST_ENTRY_SIZE 32 443 /* The size in bytes of an entry in the procedure linkage table. */ 444 #define PLT_ENTRY_SIZE 32 445 446 #define GOT_ENTRY_SIZE 4 447 448 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela) 449 450 /* The first three entries in a procedure linkage table are reserved, 451 and the initial contents are unimportant (we zero them out). 452 Subsequent entries look like this. See the SVR4 ABI 386 453 supplement to see how this works. */ 454 455 /* For the s390, simple addr offset can only be 0 - 4096. 456 To use the full 2 GB address space, several instructions 457 are needed to load an address in a register and execute 458 a branch( or just saving the address) 459 460 Furthermore, only r 0 and 1 are free to use!!! */ 461 462 /* The first 3 words in the GOT are then reserved. 463 Word 0 is the address of the dynamic table. 464 Word 1 is a pointer to a structure describing the object 465 Word 2 is used to point to the loader entry address. 466 467 The code for position independent PLT entries looks like this: 468 469 r12 holds addr of the current GOT at entry to the PLT 470 471 The GOT holds the address in the PLT to be executed. 472 The loader then gets: 473 24(15) = Pointer to the structure describing the object. 474 28(15) = Offset into rela.plt 475 476 The loader must then find the module where the function is 477 and insert the address in the GOT. 478 479 Note: 390 can only address +- 64 K relative. 480 We check if offset > 65536, then make a relative branch -64xxx 481 back to a previous defined branch 482 483 PLT1: BASR 1,0 # 2 bytes 484 L 1,22(1) # 4 bytes Load offset in GOT in r 1 485 L 1,(1,12) # 4 bytes Load address from GOT in r1 486 BCR 15,1 # 2 bytes Jump to address 487 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 488 L 1,14(1) # 4 bytes Load offset in symol table in r1 489 BRC 15,-x # 4 bytes Jump to start of PLT 490 .word 0 # 2 bytes filler 491 .long ? # 4 bytes offset in GOT 492 .long ? # 4 bytes offset into rela.plt 493 494 This was the general case. There are two additional, optimizes PLT 495 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768. 496 First the one for GOT offsets < 4096: 497 498 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1 499 BCR 15,1 # 2 bytes Jump to address 500 .word 0,0,0 # 6 bytes filler 501 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 502 L 1,14(1) # 4 bytes Load offset in rela.plt in r1 503 BRC 15,-x # 4 bytes Jump to start of PLT 504 .word 0,0,0 # 6 bytes filler 505 .long ? # 4 bytes offset into rela.plt 506 507 Second the one for GOT offsets < 32768: 508 509 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1 510 L 1,(1,12) # 4 bytes Load address from GOT to r1 511 BCR 15,1 # 2 bytes Jump to address 512 .word 0 # 2 bytes filler 513 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 514 L 1,14(1) # 4 bytes Load offset in rela.plt in r1 515 BRC 15,-x # 4 bytes Jump to start of PLT 516 .word 0,0,0 # 6 bytes filler 517 .long ? # 4 bytes offset into rela.plt 518 519 Total = 32 bytes per PLT entry 520 521 The code for static build PLT entries looks like this: 522 523 PLT1: BASR 1,0 # 2 bytes 524 L 1,22(1) # 4 bytes Load address of GOT entry 525 L 1,0(0,1) # 4 bytes Load address from GOT in r1 526 BCR 15,1 # 2 bytes Jump to address 527 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time 528 L 1,14(1) # 4 bytes Load offset in symbol table in r1 529 BRC 15,-x # 4 bytes Jump to start of PLT 530 .word 0 # 2 bytes filler 531 .long ? # 4 bytes address of GOT entry 532 .long ? # 4 bytes offset into rela.plt */ 533 534 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] = 535 { 536 0x0d, 0x10, /* basr %r1,%r0 */ 537 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */ 538 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */ 539 0x07, 0xf1, /* br %r1 */ 540 0x0d, 0x10, /* basr %r1,%r0 */ 541 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 542 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 543 0x00, 0x00, /* padding */ 544 0x00, 0x00, 0x00, 0x00, /* GOT offset */ 545 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */ 546 }; 547 548 /* Generic PLT pic entry. */ 549 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] = 550 { 551 0x0d, 0x10, /* basr %r1,%r0 */ 552 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */ 553 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */ 554 0x07, 0xf1, /* br %r1 */ 555 0x0d, 0x10, /* basr %r1,%r0 */ 556 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 557 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 558 0x00, 0x00, /* padding */ 559 0x00, 0x00, 0x00, 0x00, /* GOT offset */ 560 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */ 561 }; 562 563 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced 564 when generating the PLT slot with the GOT offset. */ 565 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] = 566 { 567 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */ 568 0x07, 0xf1, /* br %r1 */ 569 0x00, 0x00, 0x00, 0x00, /* padding */ 570 0x00, 0x00, 571 0x0d, 0x10, /* basr %r1,%r0 */ 572 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 573 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 574 0x00, 0x00, 0x00, 0x00, 575 0x00, 0x00, 0x00, 0x00 576 }; 577 578 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced 579 when generating the PLT slot with the GOT offset. */ 580 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] = 581 { 582 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */ 583 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */ 584 0x07, 0xf1, /* br %r1 */ 585 0x00, 0x00, 586 0x0d, 0x10, /* basr %r1,%r0 */ 587 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */ 588 0xa7, 0xf4, 0x00, 0x00, /* j first plt */ 589 0x00, 0x00, 0x00, 0x00, 590 0x00, 0x00, 0x00, 0x00, 591 0x00, 0x00 592 }; 593 594 /* The first PLT entry pushes the offset into the rela.plt 595 from R1 onto the stack at 8(15) and the loader object info 596 at 12(15), loads the loader address in R1 and jumps to it. */ 597 598 /* The first entry in the PLT for PIC code: 599 600 PLT0: 601 ST 1,28(15) # R1 has offset into rela.plt 602 L 1,4(12) # Get loader ino(object struct address) 603 ST 1,24(15) # Store address 604 L 1,8(12) # Entry address of loader in R1 605 BR 1 # Jump to loader 606 607 The first entry in the PLT for static code: 608 609 PLT0: 610 ST 1,28(15) # R1 has offset into rela.plt 611 BASR 1,0 612 L 1,18(0,1) # Get address of GOT 613 MVC 24(4,15),4(1) # Move loader ino to stack 614 L 1,8(1) # Get address of loader 615 BR 1 # Jump to loader 616 .word 0 # filler 617 .long got # address of GOT */ 618 619 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] = 620 { 621 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */ 622 0x0d, 0x10, /* basr %r1,%r0 */ 623 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */ 624 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */ 625 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */ 626 0x07, 0xf1, /* br %r1 */ 627 0x00, 0x00, 0x00, 0x00, 628 0x00, 0x00, 0x00, 0x00, 629 0x00, 0x00 630 }; 631 632 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] = 633 { 634 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */ 635 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */ 636 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */ 637 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */ 638 0x07, 0xf1, /* br %r1 */ 639 0x00, 0x00, 0x00, 0x00, 640 0x00, 0x00, 0x00, 0x00, 641 0x00, 0x00, 0x00, 0x00, 642 0x00, 0x00 643 }; 644 645 646 /* s390 ELF linker hash entry. */ 647 648 struct elf_s390_link_hash_entry 649 { 650 struct elf_link_hash_entry elf; 651 652 /* Track dynamic relocs copied for this symbol. */ 653 struct elf_dyn_relocs *dyn_relocs; 654 655 /* Number of GOTPLT references for a function. */ 656 bfd_signed_vma gotplt_refcount; 657 658 #define GOT_UNKNOWN 0 659 #define GOT_NORMAL 1 660 #define GOT_TLS_GD 2 661 #define GOT_TLS_IE 3 662 #define GOT_TLS_IE_NLT 4 663 unsigned char tls_type; 664 665 /* For pointer equality reasons we might need to change the symbol 666 type from STT_GNU_IFUNC to STT_FUNC together with its value and 667 section entry. So after alloc_dynrelocs only these values should 668 be used. In order to check whether a symbol is IFUNC use 669 s390_is_ifunc_symbol_p. */ 670 bfd_vma ifunc_resolver_address; 671 asection *ifunc_resolver_section; 672 }; 673 674 #define elf_s390_hash_entry(ent) \ 675 ((struct elf_s390_link_hash_entry *)(ent)) 676 677 /* This structure represents an entry in the local PLT list needed for 678 local IFUNC symbols. */ 679 struct plt_entry 680 { 681 /* The section of the local symbol. 682 Set in relocate_section and used in finish_dynamic_sections. */ 683 asection *sec; 684 685 union 686 { 687 bfd_signed_vma refcount; 688 bfd_vma offset; 689 } plt; 690 }; 691 692 /* NOTE: Keep this structure in sync with 693 the one declared in elf64-s390.c. */ 694 struct elf_s390_obj_tdata 695 { 696 struct elf_obj_tdata root; 697 698 /* A local PLT is needed for ifunc symbols. */ 699 struct plt_entry *local_plt; 700 701 /* TLS type for each local got entry. */ 702 char *local_got_tls_type; 703 }; 704 705 #define elf_s390_tdata(abfd) \ 706 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any) 707 708 #define elf_s390_local_plt(abfd) \ 709 (elf_s390_tdata (abfd)->local_plt) 710 711 #define elf_s390_local_got_tls_type(abfd) \ 712 (elf_s390_tdata (abfd)->local_got_tls_type) 713 714 #define is_s390_elf(bfd) \ 715 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 716 && elf_tdata (bfd) != NULL \ 717 && elf_object_id (bfd) == S390_ELF_DATA) 718 719 static bfd_boolean 720 elf_s390_mkobject (bfd *abfd) 721 { 722 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata), 723 S390_ELF_DATA); 724 } 725 726 static bfd_boolean 727 elf_s390_object_p (bfd *abfd) 728 { 729 /* Set the right machine number for an s390 elf32 file. */ 730 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31); 731 } 732 733 /* s390 ELF linker hash table. */ 734 735 struct elf_s390_link_hash_table 736 { 737 struct elf_link_hash_table elf; 738 739 /* Short-cuts to get to dynamic linker sections. */ 740 asection *sdynbss; 741 asection *srelbss; 742 asection *irelifunc; 743 744 union 745 { 746 bfd_signed_vma refcount; 747 bfd_vma offset; 748 } tls_ldm_got; 749 750 /* Small local sym cache. */ 751 struct sym_cache sym_cache; 752 }; 753 754 /* Get the s390 ELF linker hash table from a link_info structure. */ 755 756 #define elf_s390_hash_table(p) \ 757 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 758 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL) 759 760 #undef ELF64 761 #include "elf-s390-common.c" 762 763 /* Create an entry in an s390 ELF linker hash table. */ 764 765 static struct bfd_hash_entry * 766 link_hash_newfunc (struct bfd_hash_entry *entry, 767 struct bfd_hash_table *table, 768 const char *string) 769 { 770 /* Allocate the structure if it has not already been allocated by a 771 subclass. */ 772 if (entry == NULL) 773 { 774 entry = bfd_hash_allocate (table, 775 sizeof (struct elf_s390_link_hash_entry)); 776 if (entry == NULL) 777 return entry; 778 } 779 780 /* Call the allocation method of the superclass. */ 781 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 782 if (entry != NULL) 783 { 784 struct elf_s390_link_hash_entry *eh; 785 786 eh = (struct elf_s390_link_hash_entry *) entry; 787 eh->dyn_relocs = NULL; 788 eh->gotplt_refcount = 0; 789 eh->tls_type = GOT_UNKNOWN; 790 eh->ifunc_resolver_address = 0; 791 eh->ifunc_resolver_section = NULL; 792 } 793 794 return entry; 795 } 796 797 /* Create an s390 ELF linker hash table. */ 798 799 static struct bfd_link_hash_table * 800 elf_s390_link_hash_table_create (bfd *abfd) 801 { 802 struct elf_s390_link_hash_table *ret; 803 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table); 804 805 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt); 806 if (ret == NULL) 807 return NULL; 808 809 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 810 sizeof (struct elf_s390_link_hash_entry), 811 S390_ELF_DATA)) 812 { 813 free (ret); 814 return NULL; 815 } 816 817 return &ret->elf.root; 818 } 819 820 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 821 shortcuts to them in our hash table. */ 822 823 static bfd_boolean 824 create_got_section (bfd *dynobj, struct bfd_link_info *info) 825 { 826 struct elf_s390_link_hash_table *htab; 827 828 if (! _bfd_elf_create_got_section (dynobj, info)) 829 return FALSE; 830 831 htab = elf_s390_hash_table (info); 832 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got"); 833 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); 834 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 835 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot) 836 abort (); 837 838 return TRUE; 839 } 840 841 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 842 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 843 hash table. */ 844 845 static bfd_boolean 846 elf_s390_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 847 { 848 struct elf_s390_link_hash_table *htab; 849 850 htab = elf_s390_hash_table (info); 851 if (!htab->elf.sgot && !create_got_section (dynobj, info)) 852 return FALSE; 853 854 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 855 return FALSE; 856 857 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt"); 858 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt"); 859 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); 860 if (!info->shared) 861 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); 862 863 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss 864 || (!info->shared && !htab->srelbss)) 865 abort (); 866 867 return TRUE; 868 } 869 870 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 871 872 static void 873 elf_s390_copy_indirect_symbol (struct bfd_link_info *info, 874 struct elf_link_hash_entry *dir, 875 struct elf_link_hash_entry *ind) 876 { 877 struct elf_s390_link_hash_entry *edir, *eind; 878 879 edir = (struct elf_s390_link_hash_entry *) dir; 880 eind = (struct elf_s390_link_hash_entry *) ind; 881 882 if (eind->dyn_relocs != NULL) 883 { 884 if (edir->dyn_relocs != NULL) 885 { 886 struct elf_dyn_relocs **pp; 887 struct elf_dyn_relocs *p; 888 889 /* Add reloc counts against the indirect sym to the direct sym 890 list. Merge any entries against the same section. */ 891 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 892 { 893 struct elf_dyn_relocs *q; 894 895 for (q = edir->dyn_relocs; q != NULL; q = q->next) 896 if (q->sec == p->sec) 897 { 898 q->pc_count += p->pc_count; 899 q->count += p->count; 900 *pp = p->next; 901 break; 902 } 903 if (q == NULL) 904 pp = &p->next; 905 } 906 *pp = edir->dyn_relocs; 907 } 908 909 edir->dyn_relocs = eind->dyn_relocs; 910 eind->dyn_relocs = NULL; 911 } 912 913 if (ind->root.type == bfd_link_hash_indirect 914 && dir->got.refcount <= 0) 915 { 916 edir->tls_type = eind->tls_type; 917 eind->tls_type = GOT_UNKNOWN; 918 } 919 920 if (ELIMINATE_COPY_RELOCS 921 && ind->root.type != bfd_link_hash_indirect 922 && dir->dynamic_adjusted) 923 { 924 /* If called to transfer flags for a weakdef during processing 925 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 926 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 927 dir->ref_dynamic |= ind->ref_dynamic; 928 dir->ref_regular |= ind->ref_regular; 929 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 930 dir->needs_plt |= ind->needs_plt; 931 } 932 else 933 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 934 } 935 936 static int 937 elf_s390_tls_transition (struct bfd_link_info *info, 938 int r_type, 939 int is_local) 940 { 941 if (info->shared) 942 return r_type; 943 944 switch (r_type) 945 { 946 case R_390_TLS_GD32: 947 case R_390_TLS_IE32: 948 if (is_local) 949 return R_390_TLS_LE32; 950 return R_390_TLS_IE32; 951 case R_390_TLS_GOTIE32: 952 if (is_local) 953 return R_390_TLS_LE32; 954 return R_390_TLS_GOTIE32; 955 case R_390_TLS_LDM32: 956 return R_390_TLS_LE32; 957 } 958 959 return r_type; 960 } 961 962 /* Look through the relocs for a section during the first phase, and 963 allocate space in the global offset table or procedure linkage 964 table. */ 965 966 static bfd_boolean 967 elf_s390_check_relocs (bfd *abfd, 968 struct bfd_link_info *info, 969 asection *sec, 970 const Elf_Internal_Rela *relocs) 971 { 972 struct elf_s390_link_hash_table *htab; 973 Elf_Internal_Shdr *symtab_hdr; 974 struct elf_link_hash_entry **sym_hashes; 975 const Elf_Internal_Rela *rel; 976 const Elf_Internal_Rela *rel_end; 977 asection *sreloc; 978 bfd_signed_vma *local_got_refcounts; 979 int tls_type, old_tls_type; 980 Elf_Internal_Sym *isym; 981 982 if (info->relocatable) 983 return TRUE; 984 985 BFD_ASSERT (is_s390_elf (abfd)); 986 987 htab = elf_s390_hash_table (info); 988 symtab_hdr = &elf_symtab_hdr (abfd); 989 sym_hashes = elf_sym_hashes (abfd); 990 local_got_refcounts = elf_local_got_refcounts (abfd); 991 992 sreloc = NULL; 993 994 rel_end = relocs + sec->reloc_count; 995 for (rel = relocs; rel < rel_end; rel++) 996 { 997 unsigned int r_type; 998 unsigned long r_symndx; 999 struct elf_link_hash_entry *h; 1000 1001 r_symndx = ELF32_R_SYM (rel->r_info); 1002 1003 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1004 { 1005 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 1006 abfd, r_symndx); 1007 return FALSE; 1008 } 1009 1010 if (r_symndx < symtab_hdr->sh_info) 1011 { 1012 /* A local symbol. */ 1013 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1014 abfd, r_symndx); 1015 if (isym == NULL) 1016 return FALSE; 1017 1018 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1019 { 1020 struct plt_entry *plt; 1021 1022 if (htab->elf.dynobj == NULL) 1023 htab->elf.dynobj = abfd; 1024 1025 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1026 return FALSE; 1027 1028 if (local_got_refcounts == NULL) 1029 { 1030 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 1031 return FALSE; 1032 local_got_refcounts = elf_local_got_refcounts (abfd); 1033 } 1034 plt = elf_s390_local_plt (abfd); 1035 plt[r_symndx].plt.refcount++; 1036 } 1037 h = NULL; 1038 } 1039 else 1040 { 1041 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1042 while (h->root.type == bfd_link_hash_indirect 1043 || h->root.type == bfd_link_hash_warning) 1044 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1045 1046 /* PR15323, ref flags aren't set for references in the same 1047 object. */ 1048 h->root.non_ir_ref = 1; 1049 } 1050 1051 /* Create got section and local_got_refcounts array if they 1052 are needed. */ 1053 r_type = elf_s390_tls_transition (info, 1054 ELF32_R_TYPE (rel->r_info), 1055 h == NULL); 1056 switch (r_type) 1057 { 1058 case R_390_GOT12: 1059 case R_390_GOT16: 1060 case R_390_GOT20: 1061 case R_390_GOT32: 1062 case R_390_GOTENT: 1063 case R_390_GOTPLT12: 1064 case R_390_GOTPLT16: 1065 case R_390_GOTPLT20: 1066 case R_390_GOTPLT32: 1067 case R_390_GOTPLTENT: 1068 case R_390_TLS_GD32: 1069 case R_390_TLS_GOTIE12: 1070 case R_390_TLS_GOTIE20: 1071 case R_390_TLS_GOTIE32: 1072 case R_390_TLS_IEENT: 1073 case R_390_TLS_IE32: 1074 case R_390_TLS_LDM32: 1075 if (h == NULL 1076 && local_got_refcounts == NULL) 1077 { 1078 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr)) 1079 return FALSE; 1080 local_got_refcounts = elf_local_got_refcounts (abfd); 1081 } 1082 /* Fall through. */ 1083 case R_390_GOTOFF16: 1084 case R_390_GOTOFF32: 1085 case R_390_GOTPC: 1086 case R_390_GOTPCDBL: 1087 if (htab->elf.sgot == NULL) 1088 { 1089 if (htab->elf.dynobj == NULL) 1090 htab->elf.dynobj = abfd; 1091 if (!create_got_section (htab->elf.dynobj, info)) 1092 return FALSE; 1093 } 1094 } 1095 1096 if (h != NULL) 1097 { 1098 if (htab->elf.dynobj == NULL) 1099 htab->elf.dynobj = abfd; 1100 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1101 return FALSE; 1102 1103 /* Make sure an IFUNC symbol defined in a non-shared object 1104 always gets a PLT slot. */ 1105 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1106 { 1107 /* The symbol is called by the dynamic loader in order 1108 to resolve the relocation. So it is in fact also 1109 referenced. */ 1110 h->ref_regular = 1; 1111 h->needs_plt = 1; 1112 } 1113 } 1114 switch (r_type) 1115 { 1116 case R_390_GOTOFF16: 1117 case R_390_GOTOFF32: 1118 case R_390_GOTPC: 1119 case R_390_GOTPCDBL: 1120 /* These relocs do not need a GOT slot. They just load the 1121 GOT pointer itself or address something else relative to 1122 the GOT. Since the GOT pointer has been set up above we 1123 are done. */ 1124 break; 1125 1126 case R_390_PLT12DBL: 1127 case R_390_PLT16DBL: 1128 case R_390_PLT24DBL: 1129 case R_390_PLT32DBL: 1130 case R_390_PLT32: 1131 case R_390_PLTOFF16: 1132 case R_390_PLTOFF32: 1133 /* This symbol requires a procedure linkage table entry. We 1134 actually build the entry in adjust_dynamic_symbol, 1135 because this might be a case of linking PIC code which is 1136 never referenced by a dynamic object, in which case we 1137 don't need to generate a procedure linkage table entry 1138 after all. */ 1139 1140 /* If this is a local symbol, we resolve it directly without 1141 creating a procedure linkage table entry. */ 1142 if (h != NULL) 1143 { 1144 h->needs_plt = 1; 1145 h->plt.refcount += 1; 1146 } 1147 break; 1148 1149 case R_390_GOTPLT12: 1150 case R_390_GOTPLT16: 1151 case R_390_GOTPLT20: 1152 case R_390_GOTPLT32: 1153 case R_390_GOTPLTENT: 1154 /* This symbol requires either a procedure linkage table entry 1155 or an entry in the local got. We actually build the entry 1156 in adjust_dynamic_symbol because whether this is really a 1157 global reference can change and with it the fact if we have 1158 to create a plt entry or a local got entry. To be able to 1159 make a once global symbol a local one we have to keep track 1160 of the number of gotplt references that exist for this 1161 symbol. */ 1162 if (h != NULL) 1163 { 1164 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++; 1165 h->needs_plt = 1; 1166 h->plt.refcount += 1; 1167 } 1168 else 1169 local_got_refcounts[r_symndx] += 1; 1170 break; 1171 1172 case R_390_TLS_LDM32: 1173 htab->tls_ldm_got.refcount += 1; 1174 break; 1175 1176 case R_390_TLS_IE32: 1177 case R_390_TLS_GOTIE12: 1178 case R_390_TLS_GOTIE20: 1179 case R_390_TLS_GOTIE32: 1180 case R_390_TLS_IEENT: 1181 if (info->shared) 1182 info->flags |= DF_STATIC_TLS; 1183 /* Fall through. */ 1184 1185 case R_390_GOT12: 1186 case R_390_GOT16: 1187 case R_390_GOT20: 1188 case R_390_GOT32: 1189 case R_390_GOTENT: 1190 case R_390_TLS_GD32: 1191 /* This symbol requires a global offset table entry. */ 1192 switch (r_type) 1193 { 1194 default: 1195 case R_390_GOT12: 1196 case R_390_GOT16: 1197 case R_390_GOT20: 1198 case R_390_GOT32: 1199 case R_390_GOTENT: 1200 tls_type = GOT_NORMAL; 1201 break; 1202 case R_390_TLS_GD32: 1203 tls_type = GOT_TLS_GD; 1204 break; 1205 case R_390_TLS_IE32: 1206 case R_390_TLS_GOTIE32: 1207 tls_type = GOT_TLS_IE; 1208 break; 1209 case R_390_TLS_GOTIE12: 1210 case R_390_TLS_GOTIE20: 1211 case R_390_TLS_IEENT: 1212 tls_type = GOT_TLS_IE_NLT; 1213 break; 1214 } 1215 1216 if (h != NULL) 1217 { 1218 h->got.refcount += 1; 1219 old_tls_type = elf_s390_hash_entry(h)->tls_type; 1220 } 1221 else 1222 { 1223 local_got_refcounts[r_symndx] += 1; 1224 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx]; 1225 } 1226 /* If a TLS symbol is accessed using IE at least once, 1227 there is no point to use dynamic model for it. */ 1228 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN) 1229 { 1230 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL) 1231 { 1232 (*_bfd_error_handler) 1233 (_("%B: `%s' accessed both as normal and thread local symbol"), 1234 abfd, h->root.root.string); 1235 return FALSE; 1236 } 1237 if (old_tls_type > tls_type) 1238 tls_type = old_tls_type; 1239 } 1240 1241 if (old_tls_type != tls_type) 1242 { 1243 if (h != NULL) 1244 elf_s390_hash_entry (h)->tls_type = tls_type; 1245 else 1246 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type; 1247 } 1248 1249 if (r_type != R_390_TLS_IE32) 1250 break; 1251 /* Fall through. */ 1252 1253 case R_390_TLS_LE32: 1254 if (!info->shared) 1255 break; 1256 info->flags |= DF_STATIC_TLS; 1257 /* Fall through. */ 1258 1259 case R_390_8: 1260 case R_390_16: 1261 case R_390_32: 1262 case R_390_PC16: 1263 case R_390_PC12DBL: 1264 case R_390_PC16DBL: 1265 case R_390_PC24DBL: 1266 case R_390_PC32DBL: 1267 case R_390_PC32: 1268 if (h != NULL) 1269 { 1270 /* If this reloc is in a read-only section, we might 1271 need a copy reloc. We can't check reliably at this 1272 stage whether the section is read-only, as input 1273 sections have not yet been mapped to output sections. 1274 Tentatively set the flag for now, and correct in 1275 adjust_dynamic_symbol. */ 1276 h->non_got_ref = 1; 1277 1278 if (!info->shared) 1279 { 1280 /* We may need a .plt entry if the function this reloc 1281 refers to is in a shared lib. */ 1282 h->plt.refcount += 1; 1283 } 1284 } 1285 1286 /* If we are creating a shared library, and this is a reloc 1287 against a global symbol, or a non PC relative reloc 1288 against a local symbol, then we need to copy the reloc 1289 into the shared library. However, if we are linking with 1290 -Bsymbolic, we do not need to copy a reloc against a 1291 global symbol which is defined in an object we are 1292 including in the link (i.e., DEF_REGULAR is set). At 1293 this point we have not seen all the input files, so it is 1294 possible that DEF_REGULAR is not set now but will be set 1295 later (it is never cleared). In case of a weak definition, 1296 DEF_REGULAR may be cleared later by a strong definition in 1297 a shared library. We account for that possibility below by 1298 storing information in the relocs_copied field of the hash 1299 table entry. A similar situation occurs when creating 1300 shared libraries and symbol visibility changes render the 1301 symbol local. 1302 1303 If on the other hand, we are creating an executable, we 1304 may need to keep relocations for symbols satisfied by a 1305 dynamic library if we manage to avoid copy relocs for the 1306 symbol. */ 1307 if ((info->shared 1308 && (sec->flags & SEC_ALLOC) != 0 1309 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 1310 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL 1311 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL 1312 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL 1313 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL 1314 && ELF32_R_TYPE (rel->r_info) != R_390_PC32) 1315 || (h != NULL 1316 && (! SYMBOLIC_BIND (info, h) 1317 || h->root.type == bfd_link_hash_defweak 1318 || !h->def_regular)))) 1319 || (ELIMINATE_COPY_RELOCS 1320 && !info->shared 1321 && (sec->flags & SEC_ALLOC) != 0 1322 && h != NULL 1323 && (h->root.type == bfd_link_hash_defweak 1324 || !h->def_regular))) 1325 { 1326 struct elf_dyn_relocs *p; 1327 struct elf_dyn_relocs **head; 1328 1329 /* We must copy these reloc types into the output file. 1330 Create a reloc section in dynobj and make room for 1331 this reloc. */ 1332 if (sreloc == NULL) 1333 { 1334 if (htab->elf.dynobj == NULL) 1335 htab->elf.dynobj = abfd; 1336 1337 sreloc = _bfd_elf_make_dynamic_reloc_section 1338 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE); 1339 1340 if (sreloc == NULL) 1341 return FALSE; 1342 } 1343 1344 /* If this is a global symbol, we count the number of 1345 relocations we need for this symbol. */ 1346 if (h != NULL) 1347 { 1348 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs; 1349 } 1350 else 1351 { 1352 /* Track dynamic relocs needed for local syms too. 1353 We really need local syms available to do this 1354 easily. Oh well. */ 1355 asection *s; 1356 void *vpp; 1357 1358 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1359 abfd, r_symndx); 1360 if (isym == NULL) 1361 return FALSE; 1362 1363 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1364 if (s == NULL) 1365 s = sec; 1366 1367 vpp = &elf_section_data (s)->local_dynrel; 1368 head = (struct elf_dyn_relocs **) vpp; 1369 } 1370 1371 p = *head; 1372 if (p == NULL || p->sec != sec) 1373 { 1374 bfd_size_type amt = sizeof *p; 1375 1376 p = ((struct elf_dyn_relocs *) 1377 bfd_alloc (htab->elf.dynobj, amt)); 1378 if (p == NULL) 1379 return FALSE; 1380 p->next = *head; 1381 *head = p; 1382 p->sec = sec; 1383 p->count = 0; 1384 p->pc_count = 0; 1385 } 1386 1387 p->count += 1; 1388 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16 1389 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL 1390 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL 1391 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL 1392 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL 1393 || ELF32_R_TYPE (rel->r_info) == R_390_PC32) 1394 p->pc_count += 1; 1395 } 1396 break; 1397 1398 /* This relocation describes the C++ object vtable hierarchy. 1399 Reconstruct it for later use during GC. */ 1400 case R_390_GNU_VTINHERIT: 1401 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1402 return FALSE; 1403 break; 1404 1405 /* This relocation describes which C++ vtable entries are actually 1406 used. Record for later use during GC. */ 1407 case R_390_GNU_VTENTRY: 1408 BFD_ASSERT (h != NULL); 1409 if (h != NULL 1410 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1411 return FALSE; 1412 break; 1413 1414 default: 1415 break; 1416 } 1417 } 1418 1419 return TRUE; 1420 } 1421 1422 /* Return the section that should be marked against GC for a given 1423 relocation. */ 1424 1425 static asection * 1426 elf_s390_gc_mark_hook (asection *sec, 1427 struct bfd_link_info *info, 1428 Elf_Internal_Rela *rel, 1429 struct elf_link_hash_entry *h, 1430 Elf_Internal_Sym *sym) 1431 { 1432 if (h != NULL) 1433 switch (ELF32_R_TYPE (rel->r_info)) 1434 { 1435 case R_390_GNU_VTINHERIT: 1436 case R_390_GNU_VTENTRY: 1437 return NULL; 1438 } 1439 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1440 1441 } 1442 1443 /* Update the got entry reference counts for the section being removed. */ 1444 1445 static bfd_boolean 1446 elf_s390_gc_sweep_hook (bfd *abfd, 1447 struct bfd_link_info *info, 1448 asection *sec, 1449 const Elf_Internal_Rela *relocs) 1450 { 1451 struct elf_s390_link_hash_table *htab; 1452 Elf_Internal_Shdr *symtab_hdr; 1453 struct elf_link_hash_entry **sym_hashes; 1454 bfd_signed_vma *local_got_refcounts; 1455 const Elf_Internal_Rela *rel, *relend; 1456 1457 if (info->relocatable) 1458 return TRUE; 1459 1460 htab = elf_s390_hash_table (info); 1461 if (htab == NULL) 1462 return FALSE; 1463 1464 elf_section_data (sec)->local_dynrel = NULL; 1465 1466 symtab_hdr = &elf_symtab_hdr (abfd); 1467 sym_hashes = elf_sym_hashes (abfd); 1468 local_got_refcounts = elf_local_got_refcounts (abfd); 1469 1470 relend = relocs + sec->reloc_count; 1471 for (rel = relocs; rel < relend; rel++) 1472 { 1473 unsigned long r_symndx; 1474 unsigned int r_type; 1475 struct elf_link_hash_entry *h = NULL; 1476 1477 r_symndx = ELF32_R_SYM (rel->r_info); 1478 if (r_symndx >= symtab_hdr->sh_info) 1479 { 1480 struct elf_s390_link_hash_entry *eh; 1481 struct elf_dyn_relocs **pp; 1482 struct elf_dyn_relocs *p; 1483 1484 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1485 while (h->root.type == bfd_link_hash_indirect 1486 || h->root.type == bfd_link_hash_warning) 1487 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1488 eh = (struct elf_s390_link_hash_entry *) h; 1489 1490 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1491 if (p->sec == sec) 1492 { 1493 /* Everything must go for SEC. */ 1494 *pp = p->next; 1495 break; 1496 } 1497 } 1498 else 1499 { 1500 Elf_Internal_Sym *isym; 1501 1502 /* A local symbol. */ 1503 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1504 abfd, r_symndx); 1505 if (isym == NULL) 1506 return FALSE; 1507 1508 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1509 { 1510 struct plt_entry *plt = elf_s390_local_plt (abfd); 1511 if (plt[r_symndx].plt.refcount > 0) 1512 plt[r_symndx].plt.refcount--; 1513 } 1514 } 1515 1516 r_type = ELF32_R_TYPE (rel->r_info); 1517 r_type = elf_s390_tls_transition (info, r_type, h != NULL); 1518 switch (r_type) 1519 { 1520 case R_390_TLS_LDM32: 1521 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0) 1522 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1; 1523 break; 1524 1525 case R_390_TLS_GD32: 1526 case R_390_TLS_IE32: 1527 case R_390_TLS_GOTIE12: 1528 case R_390_TLS_GOTIE20: 1529 case R_390_TLS_GOTIE32: 1530 case R_390_TLS_IEENT: 1531 case R_390_GOT12: 1532 case R_390_GOT16: 1533 case R_390_GOT20: 1534 case R_390_GOT32: 1535 case R_390_GOTOFF16: 1536 case R_390_GOTOFF32: 1537 case R_390_GOTPC: 1538 case R_390_GOTPCDBL: 1539 case R_390_GOTENT: 1540 if (h != NULL) 1541 { 1542 if (h->got.refcount > 0) 1543 h->got.refcount -= 1; 1544 } 1545 else if (local_got_refcounts != NULL) 1546 { 1547 if (local_got_refcounts[r_symndx] > 0) 1548 local_got_refcounts[r_symndx] -= 1; 1549 } 1550 break; 1551 1552 case R_390_8: 1553 case R_390_12: 1554 case R_390_16: 1555 case R_390_20: 1556 case R_390_32: 1557 case R_390_PC16: 1558 case R_390_PC12DBL: 1559 case R_390_PC16DBL: 1560 case R_390_PC24DBL: 1561 case R_390_PC32DBL: 1562 case R_390_PC32: 1563 if (info->shared) 1564 break; 1565 /* Fall through. */ 1566 1567 case R_390_PLT12DBL: 1568 case R_390_PLT16DBL: 1569 case R_390_PLT24DBL: 1570 case R_390_PLT32DBL: 1571 case R_390_PLT32: 1572 case R_390_PLTOFF16: 1573 case R_390_PLTOFF32: 1574 if (h != NULL) 1575 { 1576 if (h->plt.refcount > 0) 1577 h->plt.refcount -= 1; 1578 } 1579 break; 1580 1581 case R_390_GOTPLT12: 1582 case R_390_GOTPLT16: 1583 case R_390_GOTPLT20: 1584 case R_390_GOTPLT32: 1585 case R_390_GOTPLTENT: 1586 if (h != NULL) 1587 { 1588 if (h->plt.refcount > 0) 1589 { 1590 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--; 1591 h->plt.refcount -= 1; 1592 } 1593 } 1594 else if (local_got_refcounts != NULL) 1595 { 1596 if (local_got_refcounts[r_symndx] > 0) 1597 local_got_refcounts[r_symndx] -= 1; 1598 } 1599 break; 1600 1601 default: 1602 break; 1603 } 1604 } 1605 1606 return TRUE; 1607 } 1608 1609 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT 1610 entry but we found we will not create any. Called when we find we will 1611 not have any PLT for this symbol, by for example 1612 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link, 1613 or elf_s390_size_dynamic_sections if no dynamic sections will be 1614 created (we're only linking static objects). */ 1615 1616 static void 1617 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h) 1618 { 1619 if (h->elf.root.type == bfd_link_hash_warning) 1620 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link; 1621 1622 if (h->gotplt_refcount <= 0) 1623 return; 1624 1625 /* We simply add the number of gotplt references to the number 1626 * of got references for this symbol. */ 1627 h->elf.got.refcount += h->gotplt_refcount; 1628 h->gotplt_refcount = -1; 1629 } 1630 1631 /* Adjust a symbol defined by a dynamic object and referenced by a 1632 regular object. The current definition is in some section of the 1633 dynamic object, but we're not including those sections. We have to 1634 change the definition to something the rest of the link can 1635 understand. */ 1636 1637 static bfd_boolean 1638 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info, 1639 struct elf_link_hash_entry *h) 1640 { 1641 struct elf_s390_link_hash_table *htab; 1642 asection *s; 1643 1644 /* STT_GNU_IFUNC symbol must go through PLT. */ 1645 if (s390_is_ifunc_symbol_p (h)) 1646 return TRUE; 1647 1648 /* If this is a function, put it in the procedure linkage table. We 1649 will fill in the contents of the procedure linkage table later 1650 (although we could actually do it here). */ 1651 if (h->type == STT_FUNC 1652 || h->needs_plt) 1653 { 1654 if (h->plt.refcount <= 0 1655 || SYMBOL_CALLS_LOCAL (info, h) 1656 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1657 && h->root.type != bfd_link_hash_undefweak)) 1658 { 1659 /* This case can occur if we saw a PLT32 reloc in an input 1660 file, but the symbol was never referred to by a dynamic 1661 object, or if all references were garbage collected. In 1662 such a case, we don't actually need to build a procedure 1663 linkage table, and we can just do a PC32 reloc instead. */ 1664 h->plt.offset = (bfd_vma) -1; 1665 h->needs_plt = 0; 1666 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1667 } 1668 1669 return TRUE; 1670 } 1671 else 1672 /* It's possible that we incorrectly decided a .plt reloc was 1673 needed for an R_390_PC32 reloc to a non-function sym in 1674 check_relocs. We can't decide accurately between function and 1675 non-function syms in check-relocs; Objects loaded later in 1676 the link may change h->type. So fix it now. */ 1677 h->plt.offset = (bfd_vma) -1; 1678 1679 /* If this is a weak symbol, and there is a real definition, the 1680 processor independent code will have arranged for us to see the 1681 real definition first, and we can just use the same value. */ 1682 if (h->u.weakdef != NULL) 1683 { 1684 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1685 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1686 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1687 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1688 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1689 h->non_got_ref = h->u.weakdef->non_got_ref; 1690 return TRUE; 1691 } 1692 1693 /* This is a reference to a symbol defined by a dynamic object which 1694 is not a function. */ 1695 1696 /* If we are creating a shared library, we must presume that the 1697 only references to the symbol are via the global offset table. 1698 For such cases we need not do anything here; the relocations will 1699 be handled correctly by relocate_section. */ 1700 if (info->shared) 1701 return TRUE; 1702 1703 /* If there are no references to this symbol that do not use the 1704 GOT, we don't need to generate a copy reloc. */ 1705 if (!h->non_got_ref) 1706 return TRUE; 1707 1708 /* If -z nocopyreloc was given, we won't generate them either. */ 1709 if (info->nocopyreloc) 1710 { 1711 h->non_got_ref = 0; 1712 return TRUE; 1713 } 1714 1715 if (ELIMINATE_COPY_RELOCS) 1716 { 1717 struct elf_s390_link_hash_entry * eh; 1718 struct elf_dyn_relocs *p; 1719 1720 eh = (struct elf_s390_link_hash_entry *) h; 1721 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1722 { 1723 s = p->sec->output_section; 1724 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1725 break; 1726 } 1727 1728 /* If we didn't find any dynamic relocs in read-only sections, then 1729 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1730 if (p == NULL) 1731 { 1732 h->non_got_ref = 0; 1733 return TRUE; 1734 } 1735 } 1736 1737 /* We must allocate the symbol in our .dynbss section, which will 1738 become part of the .bss section of the executable. There will be 1739 an entry for this symbol in the .dynsym section. The dynamic 1740 object will contain position independent code, so all references 1741 from the dynamic object to this symbol will go through the global 1742 offset table. The dynamic linker will use the .dynsym entry to 1743 determine the address it must put in the global offset table, so 1744 both the dynamic object and the regular object will refer to the 1745 same memory location for the variable. */ 1746 1747 htab = elf_s390_hash_table (info); 1748 1749 /* We must generate a R_390_COPY reloc to tell the dynamic linker to 1750 copy the initial value out of the dynamic object and into the 1751 runtime process image. */ 1752 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1753 { 1754 htab->srelbss->size += sizeof (Elf32_External_Rela); 1755 h->needs_copy = 1; 1756 } 1757 1758 s = htab->sdynbss; 1759 1760 return _bfd_elf_adjust_dynamic_copy (h, s); 1761 } 1762 1763 /* Allocate space in .plt, .got and associated reloc sections for 1764 dynamic relocs. */ 1765 1766 static bfd_boolean 1767 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1768 { 1769 struct bfd_link_info *info; 1770 struct elf_s390_link_hash_table *htab; 1771 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h; 1772 struct elf_dyn_relocs *p; 1773 1774 if (h->root.type == bfd_link_hash_indirect) 1775 return TRUE; 1776 1777 info = (struct bfd_link_info *) inf; 1778 htab = elf_s390_hash_table (info); 1779 1780 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 1781 here if it is defined and referenced in a non-shared object. */ 1782 if (s390_is_ifunc_symbol_p (h) && h->def_regular) 1783 return s390_elf_allocate_ifunc_dyn_relocs (info, h, 1784 &eh->dyn_relocs); 1785 else if (htab->elf.dynamic_sections_created 1786 && h->plt.refcount > 0) 1787 { 1788 /* Make sure this symbol is output as a dynamic symbol. 1789 Undefined weak syms won't yet be marked as dynamic. */ 1790 if (h->dynindx == -1 1791 && !h->forced_local) 1792 { 1793 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1794 return FALSE; 1795 } 1796 1797 if (info->shared 1798 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1799 { 1800 asection *s = htab->elf.splt; 1801 1802 /* If this is the first .plt entry, make room for the special 1803 first entry. */ 1804 if (s->size == 0) 1805 s->size += PLT_FIRST_ENTRY_SIZE; 1806 1807 h->plt.offset = s->size; 1808 1809 /* If this symbol is not defined in a regular file, and we are 1810 not generating a shared library, then set the symbol to this 1811 location in the .plt. This is required to make function 1812 pointers compare as equal between the normal executable and 1813 the shared library. */ 1814 if (! info->shared 1815 && !h->def_regular) 1816 { 1817 h->root.u.def.section = s; 1818 h->root.u.def.value = h->plt.offset; 1819 } 1820 1821 /* Make room for this entry. */ 1822 s->size += PLT_ENTRY_SIZE; 1823 1824 /* We also need to make an entry in the .got.plt section, which 1825 will be placed in the .got section by the linker script. */ 1826 htab->elf.sgotplt->size += GOT_ENTRY_SIZE; 1827 1828 /* We also need to make an entry in the .rela.plt section. */ 1829 htab->elf.srelplt->size += sizeof (Elf32_External_Rela); 1830 } 1831 else 1832 { 1833 h->plt.offset = (bfd_vma) -1; 1834 h->needs_plt = 0; 1835 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1836 } 1837 } 1838 else 1839 { 1840 h->plt.offset = (bfd_vma) -1; 1841 h->needs_plt = 0; 1842 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h); 1843 } 1844 1845 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to 1846 the binary, we can optimize a bit. IE32 and GOTIE32 get converted 1847 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT 1848 we can save the dynamic TLS relocation. */ 1849 if (h->got.refcount > 0 1850 && !info->shared 1851 && h->dynindx == -1 1852 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE) 1853 { 1854 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT) 1855 /* For the GOTIE access without a literal pool entry the offset has 1856 to be stored somewhere. The immediate value in the instruction 1857 is not bit enough so the value is stored in the got. */ 1858 { 1859 h->got.offset = htab->elf.sgot->size; 1860 htab->elf.sgot->size += GOT_ENTRY_SIZE; 1861 } 1862 else 1863 h->got.offset = (bfd_vma) -1; 1864 } 1865 else if (h->got.refcount > 0) 1866 { 1867 asection *s; 1868 bfd_boolean dyn; 1869 int tls_type = elf_s390_hash_entry(h)->tls_type; 1870 1871 /* Make sure this symbol is output as a dynamic symbol. 1872 Undefined weak syms won't yet be marked as dynamic. */ 1873 if (h->dynindx == -1 1874 && !h->forced_local) 1875 { 1876 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1877 return FALSE; 1878 } 1879 1880 s = htab->elf.sgot; 1881 h->got.offset = s->size; 1882 s->size += GOT_ENTRY_SIZE; 1883 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */ 1884 if (tls_type == GOT_TLS_GD) 1885 s->size += GOT_ENTRY_SIZE; 1886 dyn = htab->elf.dynamic_sections_created; 1887 /* R_390_TLS_IE32 needs one dynamic relocation, 1888 R_390_TLS_GD32 needs one if local symbol and two if global. */ 1889 if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1890 || tls_type >= GOT_TLS_IE) 1891 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1892 else if (tls_type == GOT_TLS_GD) 1893 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela); 1894 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1895 || h->root.type != bfd_link_hash_undefweak) 1896 && (info->shared 1897 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1898 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 1899 } 1900 else 1901 h->got.offset = (bfd_vma) -1; 1902 1903 if (eh->dyn_relocs == NULL) 1904 return TRUE; 1905 1906 /* In the shared -Bsymbolic case, discard space allocated for 1907 dynamic pc-relative relocs against symbols which turn out to be 1908 defined in regular objects. For the normal shared case, discard 1909 space for pc-relative relocs that have become local due to symbol 1910 visibility changes. */ 1911 1912 if (info->shared) 1913 { 1914 if (SYMBOL_CALLS_LOCAL (info, h)) 1915 { 1916 struct elf_dyn_relocs **pp; 1917 1918 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1919 { 1920 p->count -= p->pc_count; 1921 p->pc_count = 0; 1922 if (p->count == 0) 1923 *pp = p->next; 1924 else 1925 pp = &p->next; 1926 } 1927 } 1928 1929 /* Also discard relocs on undefined weak syms with non-default 1930 visibility. */ 1931 if (eh->dyn_relocs != NULL 1932 && h->root.type == bfd_link_hash_undefweak) 1933 { 1934 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1935 eh->dyn_relocs = NULL; 1936 1937 /* Make sure undefined weak symbols are output as a dynamic 1938 symbol in PIEs. */ 1939 else if (h->dynindx == -1 1940 && !h->forced_local) 1941 { 1942 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1943 return FALSE; 1944 } 1945 } 1946 } 1947 else if (ELIMINATE_COPY_RELOCS) 1948 { 1949 /* For the non-shared case, discard space for relocs against 1950 symbols which turn out to need copy relocs or are not 1951 dynamic. */ 1952 1953 if (!h->non_got_ref 1954 && ((h->def_dynamic 1955 && !h->def_regular) 1956 || (htab->elf.dynamic_sections_created 1957 && (h->root.type == bfd_link_hash_undefweak 1958 || h->root.type == bfd_link_hash_undefined)))) 1959 { 1960 /* Make sure this symbol is output as a dynamic symbol. 1961 Undefined weak syms won't yet be marked as dynamic. */ 1962 if (h->dynindx == -1 1963 && !h->forced_local) 1964 { 1965 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1966 return FALSE; 1967 } 1968 1969 /* If that succeeded, we know we'll be keeping all the 1970 relocs. */ 1971 if (h->dynindx != -1) 1972 goto keep; 1973 } 1974 1975 eh->dyn_relocs = NULL; 1976 1977 keep: ; 1978 } 1979 1980 /* Finally, allocate space. */ 1981 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1982 { 1983 asection *sreloc = elf_section_data (p->sec)->sreloc; 1984 1985 sreloc->size += p->count * sizeof (Elf32_External_Rela); 1986 } 1987 1988 return TRUE; 1989 } 1990 1991 /* Find any dynamic relocs that apply to read-only sections. */ 1992 1993 static bfd_boolean 1994 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1995 { 1996 struct elf_s390_link_hash_entry *eh; 1997 struct elf_dyn_relocs *p; 1998 1999 eh = (struct elf_s390_link_hash_entry *) h; 2000 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2001 { 2002 asection *s = p->sec->output_section; 2003 2004 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2005 { 2006 struct bfd_link_info *info = (struct bfd_link_info *) inf; 2007 2008 info->flags |= DF_TEXTREL; 2009 2010 /* Not an error, just cut short the traversal. */ 2011 return FALSE; 2012 } 2013 } 2014 return TRUE; 2015 } 2016 2017 /* Set the sizes of the dynamic sections. */ 2018 2019 static bfd_boolean 2020 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 2021 struct bfd_link_info *info) 2022 { 2023 struct elf_s390_link_hash_table *htab; 2024 bfd *dynobj; 2025 asection *s; 2026 bfd_boolean relocs; 2027 bfd *ibfd; 2028 2029 htab = elf_s390_hash_table (info); 2030 dynobj = htab->elf.dynobj; 2031 if (dynobj == NULL) 2032 abort (); 2033 2034 if (htab->elf.dynamic_sections_created) 2035 { 2036 /* Set the contents of the .interp section to the interpreter. */ 2037 if (info->executable) 2038 { 2039 s = bfd_get_linker_section (dynobj, ".interp"); 2040 if (s == NULL) 2041 abort (); 2042 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2043 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2044 } 2045 } 2046 2047 /* Set up .got offsets for local syms, and space for local dynamic 2048 relocs. */ 2049 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2050 { 2051 bfd_signed_vma *local_got; 2052 bfd_signed_vma *end_local_got; 2053 char *local_tls_type; 2054 bfd_size_type locsymcount; 2055 Elf_Internal_Shdr *symtab_hdr; 2056 asection *srela; 2057 struct plt_entry *local_plt; 2058 unsigned int i; 2059 2060 if (! is_s390_elf (ibfd)) 2061 continue; 2062 2063 for (s = ibfd->sections; s != NULL; s = s->next) 2064 { 2065 struct elf_dyn_relocs *p; 2066 2067 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 2068 { 2069 if (!bfd_is_abs_section (p->sec) 2070 && bfd_is_abs_section (p->sec->output_section)) 2071 { 2072 /* Input section has been discarded, either because 2073 it is a copy of a linkonce section or due to 2074 linker script /DISCARD/, so we'll be discarding 2075 the relocs too. */ 2076 } 2077 else if (p->count != 0) 2078 { 2079 srela = elf_section_data (p->sec)->sreloc; 2080 srela->size += p->count * sizeof (Elf32_External_Rela); 2081 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 2082 info->flags |= DF_TEXTREL; 2083 } 2084 } 2085 } 2086 2087 local_got = elf_local_got_refcounts (ibfd); 2088 if (!local_got) 2089 continue; 2090 2091 symtab_hdr = &elf_symtab_hdr (ibfd); 2092 locsymcount = symtab_hdr->sh_info; 2093 end_local_got = local_got + locsymcount; 2094 local_tls_type = elf_s390_local_got_tls_type (ibfd); 2095 s = htab->elf.sgot; 2096 srela = htab->elf.srelgot; 2097 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 2098 { 2099 if (*local_got > 0) 2100 { 2101 *local_got = s->size; 2102 s->size += GOT_ENTRY_SIZE; 2103 if (*local_tls_type == GOT_TLS_GD) 2104 s->size += GOT_ENTRY_SIZE; 2105 if (info->shared) 2106 srela->size += sizeof (Elf32_External_Rela); 2107 } 2108 else 2109 *local_got = (bfd_vma) -1; 2110 } 2111 local_plt = elf_s390_local_plt (ibfd); 2112 for (i = 0; i < symtab_hdr->sh_info; i++) 2113 { 2114 if (local_plt[i].plt.refcount > 0) 2115 { 2116 local_plt[i].plt.offset = htab->elf.iplt->size; 2117 htab->elf.iplt->size += PLT_ENTRY_SIZE; 2118 htab->elf.igotplt->size += GOT_ENTRY_SIZE; 2119 htab->elf.irelplt->size += RELA_ENTRY_SIZE; 2120 } 2121 else 2122 local_plt[i].plt.offset = (bfd_vma) -1; 2123 } 2124 } 2125 2126 if (htab->tls_ldm_got.refcount > 0) 2127 { 2128 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32 2129 relocs. */ 2130 htab->tls_ldm_got.offset = htab->elf.sgot->size; 2131 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; 2132 htab->elf.srelgot->size += sizeof (Elf32_External_Rela); 2133 } 2134 else 2135 htab->tls_ldm_got.offset = -1; 2136 2137 /* Allocate global sym .plt and .got entries, and space for global 2138 sym dynamic relocs. */ 2139 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 2140 2141 /* We now have determined the sizes of the various dynamic sections. 2142 Allocate memory for them. */ 2143 relocs = FALSE; 2144 for (s = dynobj->sections; s != NULL; s = s->next) 2145 { 2146 if ((s->flags & SEC_LINKER_CREATED) == 0) 2147 continue; 2148 2149 if (s == htab->elf.splt 2150 || s == htab->elf.sgot 2151 || s == htab->elf.sgotplt 2152 || s == htab->sdynbss 2153 || s == htab->elf.iplt 2154 || s == htab->elf.igotplt 2155 || s == htab->irelifunc) 2156 { 2157 /* Strip this section if we don't need it; see the 2158 comment below. */ 2159 } 2160 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2161 { 2162 if (s->size != 0) 2163 relocs = TRUE; 2164 2165 /* We use the reloc_count field as a counter if we need 2166 to copy relocs into the output file. */ 2167 s->reloc_count = 0; 2168 } 2169 else 2170 { 2171 /* It's not one of our sections, so don't allocate space. */ 2172 continue; 2173 } 2174 2175 if (s->size == 0) 2176 { 2177 /* If we don't need this section, strip it from the 2178 output file. This is to handle .rela.bss and 2179 .rela.plt. We must create it in 2180 create_dynamic_sections, because it must be created 2181 before the linker maps input sections to output 2182 sections. The linker does that before 2183 adjust_dynamic_symbol is called, and it is that 2184 function which decides whether anything needs to go 2185 into these sections. */ 2186 2187 s->flags |= SEC_EXCLUDE; 2188 continue; 2189 } 2190 2191 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2192 continue; 2193 2194 /* Allocate memory for the section contents. We use bfd_zalloc 2195 here in case unused entries are not reclaimed before the 2196 section's contents are written out. This should not happen, 2197 but this way if it does, we get a R_390_NONE reloc instead 2198 of garbage. */ 2199 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2200 if (s->contents == NULL) 2201 return FALSE; 2202 } 2203 2204 if (htab->elf.dynamic_sections_created) 2205 { 2206 /* Add some entries to the .dynamic section. We fill in the 2207 values later, in elf_s390_finish_dynamic_sections, but we 2208 must add the entries now so that we get the correct size for 2209 the .dynamic section. The DT_DEBUG entry is filled in by the 2210 dynamic linker and used by the debugger. */ 2211 #define add_dynamic_entry(TAG, VAL) \ 2212 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2213 2214 if (info->executable) 2215 { 2216 if (!add_dynamic_entry (DT_DEBUG, 0)) 2217 return FALSE; 2218 } 2219 2220 if (htab->elf.splt->size != 0) 2221 { 2222 if (!add_dynamic_entry (DT_PLTGOT, 0) 2223 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2224 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 2225 || !add_dynamic_entry (DT_JMPREL, 0)) 2226 return FALSE; 2227 } 2228 2229 if (relocs) 2230 { 2231 if (!add_dynamic_entry (DT_RELA, 0) 2232 || !add_dynamic_entry (DT_RELASZ, 0) 2233 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 2234 return FALSE; 2235 2236 /* If any dynamic relocs apply to a read-only section, 2237 then we need a DT_TEXTREL entry. */ 2238 if ((info->flags & DF_TEXTREL) == 0) 2239 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); 2240 2241 if ((info->flags & DF_TEXTREL) != 0) 2242 { 2243 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2244 return FALSE; 2245 } 2246 } 2247 } 2248 #undef add_dynamic_entry 2249 2250 return TRUE; 2251 } 2252 2253 /* Return the base VMA address which should be subtracted from real addresses 2254 when resolving @dtpoff relocation. 2255 This is PT_TLS segment p_vaddr. */ 2256 2257 static bfd_vma 2258 dtpoff_base (struct bfd_link_info *info) 2259 { 2260 /* If tls_sec is NULL, we should have signalled an error already. */ 2261 if (elf_hash_table (info)->tls_sec == NULL) 2262 return 0; 2263 return elf_hash_table (info)->tls_sec->vma; 2264 } 2265 2266 /* Return the relocation value for @tpoff relocation 2267 if STT_TLS virtual address is ADDRESS. */ 2268 2269 static bfd_vma 2270 tpoff (struct bfd_link_info *info, bfd_vma address) 2271 { 2272 struct elf_link_hash_table *htab = elf_hash_table (info); 2273 2274 /* If tls_sec is NULL, we should have signalled an error already. */ 2275 if (htab->tls_sec == NULL) 2276 return 0; 2277 return htab->tls_size + htab->tls_sec->vma - address; 2278 } 2279 2280 /* Complain if TLS instruction relocation is against an invalid 2281 instruction. */ 2282 2283 static void 2284 invalid_tls_insn (bfd *input_bfd, 2285 asection *input_section, 2286 Elf_Internal_Rela *rel) 2287 { 2288 reloc_howto_type *howto; 2289 2290 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info); 2291 (*_bfd_error_handler) 2292 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"), 2293 input_bfd, 2294 input_section, 2295 (long) rel->r_offset, 2296 howto->name); 2297 bfd_set_error (bfd_error_bad_value); 2298 } 2299 2300 /* Relocate a 390 ELF section. */ 2301 2302 static bfd_boolean 2303 elf_s390_relocate_section (bfd *output_bfd, 2304 struct bfd_link_info *info, 2305 bfd *input_bfd, 2306 asection *input_section, 2307 bfd_byte *contents, 2308 Elf_Internal_Rela *relocs, 2309 Elf_Internal_Sym *local_syms, 2310 asection **local_sections) 2311 { 2312 struct elf_s390_link_hash_table *htab; 2313 Elf_Internal_Shdr *symtab_hdr; 2314 struct elf_link_hash_entry **sym_hashes; 2315 bfd_vma *local_got_offsets; 2316 Elf_Internal_Rela *rel; 2317 Elf_Internal_Rela *relend; 2318 2319 BFD_ASSERT (is_s390_elf (input_bfd)); 2320 2321 htab = elf_s390_hash_table (info); 2322 symtab_hdr = &elf_symtab_hdr (input_bfd); 2323 sym_hashes = elf_sym_hashes (input_bfd); 2324 local_got_offsets = elf_local_got_offsets (input_bfd); 2325 2326 rel = relocs; 2327 relend = relocs + input_section->reloc_count; 2328 for (; rel < relend; rel++) 2329 { 2330 unsigned int r_type; 2331 reloc_howto_type *howto; 2332 unsigned long r_symndx; 2333 struct elf_link_hash_entry *h; 2334 Elf_Internal_Sym *sym; 2335 asection *sec; 2336 bfd_vma off; 2337 bfd_vma relocation; 2338 bfd_boolean unresolved_reloc; 2339 bfd_reloc_status_type r; 2340 int tls_type; 2341 asection *base_got = htab->elf.sgot; 2342 2343 r_type = ELF32_R_TYPE (rel->r_info); 2344 if (r_type == (int) R_390_GNU_VTINHERIT 2345 || r_type == (int) R_390_GNU_VTENTRY) 2346 continue; 2347 if (r_type >= (int) R_390_max) 2348 { 2349 bfd_set_error (bfd_error_bad_value); 2350 return FALSE; 2351 } 2352 2353 howto = elf_howto_table + r_type; 2354 r_symndx = ELF32_R_SYM (rel->r_info); 2355 2356 h = NULL; 2357 sym = NULL; 2358 sec = NULL; 2359 unresolved_reloc = FALSE; 2360 if (r_symndx < symtab_hdr->sh_info) 2361 { 2362 sym = local_syms + r_symndx; 2363 sec = local_sections[r_symndx]; 2364 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2365 { 2366 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd); 2367 if (local_plt == NULL) 2368 return FALSE; 2369 2370 /* Address of the PLT slot. */ 2371 relocation = (htab->elf.iplt->output_section->vma 2372 + htab->elf.iplt->output_offset 2373 + local_plt[r_symndx].plt.offset); 2374 2375 switch (r_type) 2376 { 2377 case R_390_PLTOFF16: 2378 case R_390_PLTOFF32: 2379 relocation -= htab->elf.sgot->output_section->vma; 2380 break; 2381 case R_390_GOTPLT12: 2382 case R_390_GOTPLT16: 2383 case R_390_GOTPLT20: 2384 case R_390_GOTPLT32: 2385 case R_390_GOTPLTENT: 2386 case R_390_GOT12: 2387 case R_390_GOT16: 2388 case R_390_GOT20: 2389 case R_390_GOT32: 2390 case R_390_GOTENT: 2391 { 2392 /* Write the PLT slot address into the GOT slot. */ 2393 bfd_put_32 (output_bfd, relocation, 2394 htab->elf.sgot->contents + 2395 local_got_offsets[r_symndx]); 2396 relocation = (local_got_offsets[r_symndx] + 2397 htab->elf.sgot->output_offset); 2398 2399 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) 2400 relocation += htab->elf.sgot->output_section->vma; 2401 break; 2402 } 2403 default: 2404 break; 2405 } 2406 /* The output section is needed later in 2407 finish_dynamic_section when creating the dynamic 2408 relocation. */ 2409 local_plt[r_symndx].sec = sec; 2410 goto do_relocation; 2411 } 2412 else 2413 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2414 } 2415 else 2416 { 2417 bfd_boolean warned ATTRIBUTE_UNUSED; 2418 bfd_boolean ignored ATTRIBUTE_UNUSED; 2419 2420 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2421 r_symndx, symtab_hdr, sym_hashes, 2422 h, sec, relocation, 2423 unresolved_reloc, warned, ignored); 2424 } 2425 2426 if (sec != NULL && discarded_section (sec)) 2427 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2428 rel, 1, relend, howto, 0, contents); 2429 2430 if (info->relocatable) 2431 continue; 2432 2433 switch (r_type) 2434 { 2435 case R_390_GOTPLT12: 2436 case R_390_GOTPLT16: 2437 case R_390_GOTPLT20: 2438 case R_390_GOTPLT32: 2439 case R_390_GOTPLTENT: 2440 /* There are three cases for a GOTPLT relocation. 1) The 2441 relocation is against the jump slot entry of a plt that 2442 will get emitted to the output file. 2) The relocation 2443 is against the jump slot of a plt entry that has been 2444 removed. elf_s390_adjust_gotplt has created a GOT entry 2445 as replacement. 3) The relocation is against a local symbol. 2446 Cases 2) and 3) are the same as the GOT relocation code 2447 so we just have to test for case 1 and fall through for 2448 the other two. */ 2449 if (h != NULL && h->plt.offset != (bfd_vma) -1) 2450 { 2451 bfd_vma plt_index; 2452 2453 if (s390_is_ifunc_symbol_p (h)) 2454 { 2455 plt_index = h->plt.offset / PLT_ENTRY_SIZE; 2456 relocation = (plt_index * GOT_ENTRY_SIZE + 2457 htab->elf.igotplt->output_offset); 2458 if (r_type == R_390_GOTPLTENT) 2459 relocation += htab->elf.igotplt->output_section->vma; 2460 } 2461 else 2462 { 2463 /* Calc. index no. 2464 Current offset - size first entry / entry size. */ 2465 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / 2466 PLT_ENTRY_SIZE; 2467 2468 /* Offset in GOT is PLT index plus GOT headers(3) 2469 times 4, addr & GOT addr. */ 2470 relocation = (plt_index + 3) * GOT_ENTRY_SIZE; 2471 if (r_type == R_390_GOTPLTENT) 2472 relocation += htab->elf.sgot->output_section->vma; 2473 } 2474 unresolved_reloc = FALSE; 2475 2476 } 2477 /* Fall through. */ 2478 2479 case R_390_GOT12: 2480 case R_390_GOT16: 2481 case R_390_GOT20: 2482 case R_390_GOT32: 2483 case R_390_GOTENT: 2484 /* Relocation is to the entry for this symbol in the global 2485 offset table. */ 2486 if (base_got == NULL) 2487 abort (); 2488 2489 if (h != NULL) 2490 { 2491 bfd_boolean dyn; 2492 2493 off = h->got.offset; 2494 dyn = htab->elf.dynamic_sections_created; 2495 2496 if (s390_is_ifunc_symbol_p (h)) 2497 { 2498 BFD_ASSERT (h->plt.offset != (bfd_vma) -1); 2499 if (off == (bfd_vma)-1) 2500 { 2501 /* No explicit GOT usage so redirect to the 2502 got.iplt slot. */ 2503 base_got = htab->elf.igotplt; 2504 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE; 2505 } 2506 else 2507 { 2508 /* Explicit GOT slots must contain the address 2509 of the PLT slot. This will be handled in 2510 finish_dynamic_symbol. */ 2511 } 2512 } 2513 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2514 || (info->shared 2515 && SYMBOL_REFERENCES_LOCAL (info, h)) 2516 || (ELF_ST_VISIBILITY (h->other) 2517 && h->root.type == bfd_link_hash_undefweak)) 2518 2519 { 2520 /* This is actually a static link, or it is a 2521 -Bsymbolic link and the symbol is defined 2522 locally, or the symbol was forced to be local 2523 because of a version file. We must initialize 2524 this entry in the global offset table. Since the 2525 offset must always be a multiple of 2, we use the 2526 least significant bit to record whether we have 2527 initialized it already. 2528 2529 When doing a dynamic link, we create a .rel.got 2530 relocation entry to initialize the value. This 2531 is done in the finish_dynamic_symbol routine. */ 2532 if ((off & 1) != 0) 2533 off &= ~1; 2534 else 2535 { 2536 bfd_put_32 (output_bfd, relocation, 2537 base_got->contents + off); 2538 h->got.offset |= 1; 2539 } 2540 2541 if ((h->def_regular 2542 && info->shared 2543 && SYMBOL_REFERENCES_LOCAL (info, h)) 2544 /* lrl rx,sym@GOTENT -> larl rx, sym */ 2545 && ((r_type == R_390_GOTENT 2546 && (bfd_get_16 (input_bfd, 2547 contents + rel->r_offset - 2) 2548 & 0xff0f) == 0xc40d) 2549 /* ly rx, sym@GOT(r12) -> larl rx, sym */ 2550 || (r_type == R_390_GOT20 2551 && (bfd_get_32 (input_bfd, 2552 contents + rel->r_offset - 2) 2553 & 0xff00f000) == 0xe300c000 2554 && bfd_get_8 (input_bfd, 2555 contents + rel->r_offset + 3) == 0x58))) 2556 { 2557 unsigned short new_insn = 2558 (0xc000 | (bfd_get_8 (input_bfd, 2559 contents + rel->r_offset - 1) & 0xf0)); 2560 bfd_put_16 (output_bfd, new_insn, 2561 contents + rel->r_offset - 2); 2562 r_type = R_390_PC32DBL; 2563 rel->r_addend = 2; 2564 howto = elf_howto_table + r_type; 2565 relocation = h->root.u.def.value 2566 + h->root.u.def.section->output_section->vma 2567 + h->root.u.def.section->output_offset; 2568 goto do_relocation; 2569 } 2570 } 2571 else 2572 unresolved_reloc = FALSE; 2573 } 2574 else 2575 { 2576 if (local_got_offsets == NULL) 2577 abort (); 2578 2579 off = local_got_offsets[r_symndx]; 2580 2581 /* The offset must always be a multiple of 4. We use 2582 the least significant bit to record whether we have 2583 already generated the necessary reloc. */ 2584 if ((off & 1) != 0) 2585 off &= ~1; 2586 else 2587 { 2588 bfd_put_32 (output_bfd, relocation, 2589 htab->elf.sgot->contents + off); 2590 2591 if (info->shared) 2592 { 2593 asection *srelgot; 2594 Elf_Internal_Rela outrel; 2595 bfd_byte *loc; 2596 2597 srelgot = htab->elf.srelgot; 2598 if (srelgot == NULL) 2599 abort (); 2600 2601 outrel.r_offset = (htab->elf.sgot->output_section->vma 2602 + htab->elf.sgot->output_offset 2603 + off); 2604 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2605 outrel.r_addend = relocation; 2606 loc = srelgot->contents; 2607 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 2608 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2609 } 2610 2611 local_got_offsets[r_symndx] |= 1; 2612 } 2613 } 2614 2615 if (off >= (bfd_vma) -2) 2616 abort (); 2617 2618 relocation = base_got->output_offset + off; 2619 2620 /* For @GOTENT the relocation is against the offset between 2621 the instruction and the symbols entry in the GOT and not 2622 between the start of the GOT and the symbols entry. We 2623 add the vma of the GOT to get the correct value. */ 2624 if ( r_type == R_390_GOTENT 2625 || r_type == R_390_GOTPLTENT) 2626 relocation += base_got->output_section->vma; 2627 2628 break; 2629 2630 case R_390_GOTOFF16: 2631 case R_390_GOTOFF32: 2632 /* Relocation is relative to the start of the global offset 2633 table. */ 2634 2635 /* Note that sgot->output_offset is not involved in this 2636 calculation. We always want the start of .got. If we 2637 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2638 permitted by the ABI, we might have to change this 2639 calculation. */ 2640 relocation -= htab->elf.sgot->output_section->vma; 2641 break; 2642 2643 case R_390_GOTPC: 2644 case R_390_GOTPCDBL: 2645 /* Use global offset table as symbol value. */ 2646 relocation = htab->elf.sgot->output_section->vma; 2647 unresolved_reloc = FALSE; 2648 break; 2649 2650 case R_390_PLT12DBL: 2651 case R_390_PLT16DBL: 2652 case R_390_PLT24DBL: 2653 case R_390_PLT32DBL: 2654 case R_390_PLT32: 2655 /* Relocation is to the entry for this symbol in the 2656 procedure linkage table. */ 2657 2658 /* Resolve a PLT32 reloc against a local symbol directly, 2659 without using the procedure linkage table. */ 2660 if (h == NULL) 2661 break; 2662 2663 if (h->plt.offset == (bfd_vma) -1 2664 || (htab->elf.splt == NULL && htab->elf.iplt == NULL)) 2665 { 2666 /* We didn't make a PLT entry for this symbol. This 2667 happens when statically linking PIC code, or when 2668 using -Bsymbolic. */ 2669 break; 2670 } 2671 2672 if (s390_is_ifunc_symbol_p (h)) 2673 relocation = (htab->elf.iplt->output_section->vma 2674 + htab->elf.iplt->output_offset 2675 + h->plt.offset); 2676 else 2677 relocation = (htab->elf.splt->output_section->vma 2678 + htab->elf.splt->output_offset 2679 + h->plt.offset); 2680 unresolved_reloc = FALSE; 2681 break; 2682 2683 case R_390_PLTOFF16: 2684 case R_390_PLTOFF32: 2685 /* Relocation is to the entry for this symbol in the 2686 procedure linkage table relative to the start of the GOT. */ 2687 2688 /* For local symbols or if we didn't make a PLT entry for 2689 this symbol resolve the symbol directly. */ 2690 if (h == NULL 2691 || h->plt.offset == (bfd_vma) -1 2692 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h))) 2693 { 2694 relocation -= htab->elf.sgot->output_section->vma; 2695 break; 2696 } 2697 2698 if (s390_is_ifunc_symbol_p (h)) 2699 relocation = (htab->elf.iplt->output_section->vma 2700 + htab->elf.iplt->output_offset 2701 + h->plt.offset 2702 - htab->elf.sgot->output_section->vma); 2703 else 2704 relocation = (htab->elf.splt->output_section->vma 2705 + htab->elf.splt->output_offset 2706 + h->plt.offset 2707 - htab->elf.sgot->output_section->vma); 2708 unresolved_reloc = FALSE; 2709 break; 2710 2711 case R_390_8: 2712 case R_390_16: 2713 case R_390_32: 2714 case R_390_PC16: 2715 case R_390_PC12DBL: 2716 case R_390_PC16DBL: 2717 case R_390_PC24DBL: 2718 case R_390_PC32DBL: 2719 case R_390_PC32: 2720 if (h != NULL 2721 && s390_is_ifunc_symbol_p (h) 2722 && h->def_regular) 2723 { 2724 if (!info->shared || !h->non_got_ref) 2725 { 2726 /* For a non-shared object STT_GNU_IFUNC symbol must 2727 go through PLT. */ 2728 relocation = (htab->elf.iplt->output_section->vma 2729 + htab->elf.iplt->output_offset 2730 + h ->plt.offset); 2731 goto do_relocation; 2732 } 2733 else 2734 { 2735 /* For shared objects a runtime relocation is needed. */ 2736 2737 Elf_Internal_Rela outrel; 2738 asection *sreloc; 2739 2740 /* Need a dynamic relocation to get the real function 2741 address. */ 2742 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2743 info, 2744 input_section, 2745 rel->r_offset); 2746 if (outrel.r_offset == (bfd_vma) -1 2747 || outrel.r_offset == (bfd_vma) -2) 2748 abort (); 2749 2750 outrel.r_offset += (input_section->output_section->vma 2751 + input_section->output_offset); 2752 2753 if (h->dynindx == -1 2754 || h->forced_local 2755 || info->executable) 2756 { 2757 /* This symbol is resolved locally. */ 2758 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 2759 outrel.r_addend = (h->root.u.def.value 2760 + h->root.u.def.section->output_section->vma 2761 + h->root.u.def.section->output_offset); 2762 } 2763 else 2764 { 2765 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2766 outrel.r_addend = 0; 2767 } 2768 2769 sreloc = htab->elf.irelifunc; 2770 elf_append_rela (output_bfd, sreloc, &outrel); 2771 2772 /* If this reloc is against an external symbol, we 2773 do not want to fiddle with the addend. Otherwise, 2774 we need to include the symbol value so that it 2775 becomes an addend for the dynamic reloc. For an 2776 internal symbol, we have updated addend. */ 2777 continue; 2778 } 2779 } 2780 2781 if ((input_section->flags & SEC_ALLOC) == 0) 2782 break; 2783 2784 if ((info->shared 2785 && (h == NULL 2786 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2787 || h->root.type != bfd_link_hash_undefweak) 2788 && ((r_type != R_390_PC16 2789 && r_type != R_390_PC12DBL 2790 && r_type != R_390_PC16DBL 2791 && r_type != R_390_PC24DBL 2792 && r_type != R_390_PC32DBL 2793 && r_type != R_390_PC32) 2794 || !SYMBOL_CALLS_LOCAL (info, h))) 2795 || (ELIMINATE_COPY_RELOCS 2796 && !info->shared 2797 && h != NULL 2798 && h->dynindx != -1 2799 && !h->non_got_ref 2800 && ((h->def_dynamic 2801 && !h->def_regular) 2802 || h->root.type == bfd_link_hash_undefweak 2803 || h->root.type == bfd_link_hash_undefined))) 2804 { 2805 Elf_Internal_Rela outrel; 2806 bfd_boolean skip, relocate; 2807 asection *sreloc; 2808 bfd_byte *loc; 2809 2810 /* When generating a shared object, these relocations 2811 are copied into the output file to be resolved at run 2812 time. */ 2813 2814 skip = FALSE; 2815 relocate = FALSE; 2816 2817 outrel.r_offset = 2818 _bfd_elf_section_offset (output_bfd, info, input_section, 2819 rel->r_offset); 2820 if (outrel.r_offset == (bfd_vma) -1) 2821 skip = TRUE; 2822 else if (outrel.r_offset == (bfd_vma) -2) 2823 skip = TRUE, relocate = TRUE; 2824 outrel.r_offset += (input_section->output_section->vma 2825 + input_section->output_offset); 2826 2827 if (skip) 2828 memset (&outrel, 0, sizeof outrel); 2829 else if (h != NULL 2830 && h->dynindx != -1 2831 && (r_type == R_390_PC16 2832 || r_type == R_390_PC12DBL 2833 || r_type == R_390_PC16DBL 2834 || r_type == R_390_PC24DBL 2835 || r_type == R_390_PC32DBL 2836 || r_type == R_390_PC32 2837 || !info->shared 2838 || !SYMBOLIC_BIND (info, h) 2839 || !h->def_regular)) 2840 { 2841 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2842 outrel.r_addend = rel->r_addend; 2843 } 2844 else 2845 { 2846 /* This symbol is local, or marked to become local. */ 2847 outrel.r_addend = relocation + rel->r_addend; 2848 if (r_type == R_390_32) 2849 { 2850 relocate = TRUE; 2851 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2852 } 2853 else 2854 { 2855 long sindx; 2856 2857 if (bfd_is_abs_section (sec)) 2858 sindx = 0; 2859 else if (sec == NULL || sec->owner == NULL) 2860 { 2861 bfd_set_error(bfd_error_bad_value); 2862 return FALSE; 2863 } 2864 else 2865 { 2866 asection *osec; 2867 2868 osec = sec->output_section; 2869 sindx = elf_section_data (osec)->dynindx; 2870 if (sindx == 0) 2871 { 2872 osec = htab->elf.text_index_section; 2873 sindx = elf_section_data (osec)->dynindx; 2874 } 2875 BFD_ASSERT (sindx != 0); 2876 2877 /* We are turning this relocation into one 2878 against a section symbol, so subtract out 2879 the output section's address but not the 2880 offset of the input section in the output 2881 section. */ 2882 outrel.r_addend -= osec->vma; 2883 } 2884 outrel.r_info = ELF32_R_INFO (sindx, r_type); 2885 } 2886 } 2887 2888 sreloc = elf_section_data (input_section)->sreloc; 2889 if (sreloc == NULL) 2890 abort (); 2891 2892 loc = sreloc->contents; 2893 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2894 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2895 2896 /* If this reloc is against an external symbol, we do 2897 not want to fiddle with the addend. Otherwise, we 2898 need to include the symbol value so that it becomes 2899 an addend for the dynamic reloc. */ 2900 if (! relocate) 2901 continue; 2902 } 2903 break; 2904 2905 /* Relocations for tls literal pool entries. */ 2906 case R_390_TLS_IE32: 2907 if (info->shared) 2908 { 2909 Elf_Internal_Rela outrel; 2910 asection *sreloc; 2911 bfd_byte *loc; 2912 2913 outrel.r_offset = rel->r_offset 2914 + input_section->output_section->vma 2915 + input_section->output_offset; 2916 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 2917 sreloc = elf_section_data (input_section)->sreloc; 2918 if (sreloc == NULL) 2919 abort (); 2920 loc = sreloc->contents; 2921 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 2922 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2923 } 2924 /* Fall through. */ 2925 2926 case R_390_TLS_GD32: 2927 case R_390_TLS_GOTIE32: 2928 r_type = elf_s390_tls_transition (info, r_type, h == NULL); 2929 tls_type = GOT_UNKNOWN; 2930 if (h == NULL && local_got_offsets) 2931 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 2932 else if (h != NULL) 2933 { 2934 tls_type = elf_s390_hash_entry(h)->tls_type; 2935 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE) 2936 r_type = R_390_TLS_LE32; 2937 } 2938 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE) 2939 r_type = R_390_TLS_IE32; 2940 2941 if (r_type == R_390_TLS_LE32) 2942 { 2943 /* This relocation gets optimized away by the local exec 2944 access optimization. */ 2945 BFD_ASSERT (! unresolved_reloc); 2946 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2947 contents + rel->r_offset); 2948 continue; 2949 } 2950 2951 if (htab->elf.sgot == NULL) 2952 abort (); 2953 2954 if (h != NULL) 2955 off = h->got.offset; 2956 else 2957 { 2958 if (local_got_offsets == NULL) 2959 abort (); 2960 2961 off = local_got_offsets[r_symndx]; 2962 } 2963 2964 emit_tls_relocs: 2965 2966 if ((off & 1) != 0) 2967 off &= ~1; 2968 else 2969 { 2970 Elf_Internal_Rela outrel; 2971 bfd_byte *loc; 2972 int dr_type, indx; 2973 2974 if (htab->elf.srelgot == NULL) 2975 abort (); 2976 2977 outrel.r_offset = (htab->elf.sgot->output_section->vma 2978 + htab->elf.sgot->output_offset + off); 2979 2980 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2981 if (r_type == R_390_TLS_GD32) 2982 dr_type = R_390_TLS_DTPMOD; 2983 else 2984 dr_type = R_390_TLS_TPOFF; 2985 if (dr_type == R_390_TLS_TPOFF && indx == 0) 2986 outrel.r_addend = relocation - dtpoff_base (info); 2987 else 2988 outrel.r_addend = 0; 2989 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2990 loc = htab->elf.srelgot->contents; 2991 loc += htab->elf.srelgot->reloc_count++ 2992 * sizeof (Elf32_External_Rela); 2993 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 2994 2995 if (r_type == R_390_TLS_GD32) 2996 { 2997 if (indx == 0) 2998 { 2999 BFD_ASSERT (! unresolved_reloc); 3000 bfd_put_32 (output_bfd, 3001 relocation - dtpoff_base (info), 3002 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3003 } 3004 else 3005 { 3006 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF); 3007 outrel.r_offset += GOT_ENTRY_SIZE; 3008 outrel.r_addend = 0; 3009 htab->elf.srelgot->reloc_count++; 3010 loc += sizeof (Elf32_External_Rela); 3011 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3012 } 3013 } 3014 3015 if (h != NULL) 3016 h->got.offset |= 1; 3017 else 3018 local_got_offsets[r_symndx] |= 1; 3019 } 3020 3021 if (off >= (bfd_vma) -2) 3022 abort (); 3023 if (r_type == ELF32_R_TYPE (rel->r_info)) 3024 { 3025 relocation = htab->elf.sgot->output_offset + off; 3026 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT) 3027 relocation += htab->elf.sgot->output_section->vma; 3028 unresolved_reloc = FALSE; 3029 } 3030 else 3031 { 3032 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off, 3033 contents + rel->r_offset); 3034 continue; 3035 } 3036 break; 3037 3038 case R_390_TLS_GOTIE12: 3039 case R_390_TLS_GOTIE20: 3040 case R_390_TLS_IEENT: 3041 if (h == NULL) 3042 { 3043 if (local_got_offsets == NULL) 3044 abort(); 3045 off = local_got_offsets[r_symndx]; 3046 if (info->shared) 3047 goto emit_tls_relocs; 3048 } 3049 else 3050 { 3051 off = h->got.offset; 3052 tls_type = elf_s390_hash_entry(h)->tls_type; 3053 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE) 3054 goto emit_tls_relocs; 3055 } 3056 3057 if (htab->elf.sgot == NULL) 3058 abort (); 3059 3060 BFD_ASSERT (! unresolved_reloc); 3061 bfd_put_32 (output_bfd, -tpoff (info, relocation), 3062 htab->elf.sgot->contents + off); 3063 relocation = htab->elf.sgot->output_offset + off; 3064 if (r_type == R_390_TLS_IEENT) 3065 relocation += htab->elf.sgot->output_section->vma; 3066 unresolved_reloc = FALSE; 3067 break; 3068 3069 case R_390_TLS_LDM32: 3070 if (! info->shared) 3071 /* The literal pool entry this relocation refers to gets ignored 3072 by the optimized code of the local exec model. Do nothing 3073 and the value will turn out zero. */ 3074 continue; 3075 3076 if (htab->elf.sgot == NULL) 3077 abort (); 3078 3079 off = htab->tls_ldm_got.offset; 3080 if (off & 1) 3081 off &= ~1; 3082 else 3083 { 3084 Elf_Internal_Rela outrel; 3085 bfd_byte *loc; 3086 3087 if (htab->elf.srelgot == NULL) 3088 abort (); 3089 3090 outrel.r_offset = (htab->elf.sgot->output_section->vma 3091 + htab->elf.sgot->output_offset + off); 3092 3093 bfd_put_32 (output_bfd, 0, 3094 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3095 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD); 3096 outrel.r_addend = 0; 3097 loc = htab->elf.srelgot->contents; 3098 loc += htab->elf.srelgot->reloc_count++ 3099 * sizeof (Elf32_External_Rela); 3100 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3101 htab->tls_ldm_got.offset |= 1; 3102 } 3103 relocation = htab->elf.sgot->output_offset + off; 3104 unresolved_reloc = FALSE; 3105 break; 3106 3107 case R_390_TLS_LE32: 3108 if (info->shared) 3109 { 3110 /* Linking a shared library with non-fpic code requires 3111 a R_390_TLS_TPOFF relocation. */ 3112 Elf_Internal_Rela outrel; 3113 asection *sreloc; 3114 bfd_byte *loc; 3115 int indx; 3116 3117 outrel.r_offset = rel->r_offset 3118 + input_section->output_section->vma 3119 + input_section->output_offset; 3120 if (h != NULL && h->dynindx != -1) 3121 indx = h->dynindx; 3122 else 3123 indx = 0; 3124 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF); 3125 if (indx == 0) 3126 outrel.r_addend = relocation - dtpoff_base (info); 3127 else 3128 outrel.r_addend = 0; 3129 sreloc = elf_section_data (input_section)->sreloc; 3130 if (sreloc == NULL) 3131 abort (); 3132 loc = sreloc->contents; 3133 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 3134 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3135 } 3136 else 3137 { 3138 BFD_ASSERT (! unresolved_reloc); 3139 bfd_put_32 (output_bfd, -tpoff (info, relocation), 3140 contents + rel->r_offset); 3141 } 3142 continue; 3143 3144 case R_390_TLS_LDO32: 3145 if (info->shared || (input_section->flags & SEC_DEBUGGING)) 3146 relocation -= dtpoff_base (info); 3147 else 3148 /* When converting LDO to LE, we must negate. */ 3149 relocation = -tpoff (info, relocation); 3150 break; 3151 3152 /* Relocations for tls instructions. */ 3153 case R_390_TLS_LOAD: 3154 case R_390_TLS_GDCALL: 3155 case R_390_TLS_LDCALL: 3156 tls_type = GOT_UNKNOWN; 3157 if (h == NULL && local_got_offsets) 3158 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx]; 3159 else if (h != NULL) 3160 tls_type = elf_s390_hash_entry(h)->tls_type; 3161 3162 if (tls_type == GOT_TLS_GD) 3163 continue; 3164 3165 if (r_type == R_390_TLS_LOAD) 3166 { 3167 if (!info->shared && (h == NULL || h->dynindx == -1)) 3168 { 3169 /* IE->LE transition. Four valid cases: 3170 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 3171 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 3172 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 3173 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 3174 unsigned int insn, ry; 3175 3176 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3177 ry = 0; 3178 if ((insn & 0xff00f000) == 0x58000000) 3179 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */ 3180 ry = (insn & 0x000f0000); 3181 else if ((insn & 0xff0f0000) == 0x58000000) 3182 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */ 3183 ry = (insn & 0x0000f000) << 4; 3184 else if ((insn & 0xff00f000) == 0x5800c000) 3185 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */ 3186 ry = (insn & 0x000f0000); 3187 else if ((insn & 0xff0f0000) == 0x580c0000) 3188 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */ 3189 ry = (insn & 0x0000f000) << 4; 3190 else 3191 invalid_tls_insn (input_bfd, input_section, rel); 3192 insn = 0x18000700 | (insn & 0x00f00000) | ry; 3193 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3194 } 3195 } 3196 else if (r_type == R_390_TLS_GDCALL) 3197 { 3198 unsigned int insn; 3199 3200 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3201 if ((insn & 0xff000fff) != 0x4d000000 && 3202 (insn & 0xffff0000) != 0xc0e50000 && 3203 (insn & 0xff000000) != 0x0d000000) 3204 invalid_tls_insn (input_bfd, input_section, rel); 3205 if (!info->shared && (h == NULL || h->dynindx == -1)) 3206 { 3207 if ((insn & 0xff000000) == 0x0d000000) 3208 { 3209 /* GD->LE transition. 3210 basr rx, ry -> nopr r7 */ 3211 insn = 0x07070000 | (insn & 0xffff); 3212 } 3213 else if ((insn & 0xff000000) == 0x4d000000) 3214 { 3215 /* GD->LE transition. 3216 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3217 insn = 0x47000000; 3218 } 3219 else 3220 { 3221 /* GD->LE transition. 3222 brasl %r14,_tls_get_offset@plt -> brcl 0,. */ 3223 insn = 0xc0040000; 3224 bfd_put_16 (output_bfd, 0x0000, 3225 contents + rel->r_offset + 4); 3226 } 3227 } 3228 else 3229 { 3230 /* If basr is used in the pic case to invoke 3231 _tls_get_offset, something went wrong before. */ 3232 if ((insn & 0xff000000) == 0x0d000000) 3233 invalid_tls_insn (input_bfd, input_section, rel); 3234 3235 if ((insn & 0xff000000) == 0x4d000000) 3236 { 3237 /* GD->IE transition. 3238 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */ 3239 insn = 0x5822c000; 3240 } 3241 else 3242 { 3243 /* GD->IE transition. 3244 brasl %r14,__tls_get_addr@plt -> 3245 l %r2,0(%r2,%r12) ; bcr 0,0 */ 3246 insn = 0x5822c000; 3247 bfd_put_16 (output_bfd, 0x0700, 3248 contents + rel->r_offset + 4); 3249 } 3250 } 3251 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3252 } 3253 else if (r_type == R_390_TLS_LDCALL) 3254 { 3255 if (!info->shared) 3256 { 3257 unsigned int insn; 3258 3259 insn = bfd_get_32 (input_bfd, contents + rel->r_offset); 3260 if ((insn & 0xff000fff) != 0x4d000000 && 3261 (insn & 0xffff0000) != 0xc0e50000 && 3262 (insn & 0xff000000) != 0x0d000000) 3263 invalid_tls_insn (input_bfd, input_section, rel); 3264 3265 if ((insn & 0xff000000) == 0x0d000000) 3266 { 3267 /* LD->LE transition. 3268 basr rx, ry -> nopr r7 */ 3269 insn = 0x07070000 | (insn & 0xffff); 3270 } 3271 else if ((insn & 0xff000000) == 0x4d000000) 3272 { 3273 /* LD->LE transition. 3274 bas %r14,0(%rx,%r13) -> bc 0,0 */ 3275 insn = 0x47000000; 3276 } 3277 else 3278 { 3279 /* LD->LE transition. 3280 brasl %r14,__tls_get_offset@plt -> brcl 0,. */ 3281 insn = 0xc0040000; 3282 bfd_put_16 (output_bfd, 0x0000, 3283 contents + rel->r_offset + 4); 3284 } 3285 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 3286 } 3287 } 3288 continue; 3289 3290 default: 3291 break; 3292 } 3293 3294 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3295 because such sections are not SEC_ALLOC and thus ld.so will 3296 not process them. */ 3297 if (unresolved_reloc 3298 && !((input_section->flags & SEC_DEBUGGING) != 0 3299 && h->def_dynamic) 3300 && _bfd_elf_section_offset (output_bfd, info, input_section, 3301 rel->r_offset) != (bfd_vma) -1) 3302 (*_bfd_error_handler) 3303 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3304 input_bfd, 3305 input_section, 3306 (long) rel->r_offset, 3307 howto->name, 3308 h->root.root.string); 3309 3310 do_relocation: 3311 3312 /* When applying a 24 bit reloc we need to start one byte 3313 earlier. Otherwise the 32 bit get/put bfd operations might 3314 access a byte after the actual section. */ 3315 if (r_type == R_390_PC24DBL 3316 || r_type == R_390_PLT24DBL) 3317 rel->r_offset--; 3318 3319 if (r_type == R_390_20 3320 || r_type == R_390_GOT20 3321 || r_type == R_390_GOTPLT20 3322 || r_type == R_390_TLS_GOTIE20) 3323 { 3324 relocation += rel->r_addend; 3325 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12; 3326 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3327 contents, rel->r_offset, 3328 relocation, 0); 3329 } 3330 else 3331 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3332 contents, rel->r_offset, 3333 relocation, rel->r_addend); 3334 3335 if (r != bfd_reloc_ok) 3336 { 3337 const char *name; 3338 3339 if (h != NULL) 3340 name = h->root.root.string; 3341 else 3342 { 3343 name = bfd_elf_string_from_elf_section (input_bfd, 3344 symtab_hdr->sh_link, 3345 sym->st_name); 3346 if (name == NULL) 3347 return FALSE; 3348 if (*name == '\0') 3349 name = bfd_section_name (input_bfd, sec); 3350 } 3351 3352 if (r == bfd_reloc_overflow) 3353 { 3354 3355 if (! ((*info->callbacks->reloc_overflow) 3356 (info, (h ? &h->root : NULL), name, howto->name, 3357 (bfd_vma) 0, input_bfd, input_section, 3358 rel->r_offset))) 3359 return FALSE; 3360 } 3361 else 3362 { 3363 (*_bfd_error_handler) 3364 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3365 input_bfd, input_section, 3366 (long) rel->r_offset, name, (int) r); 3367 return FALSE; 3368 } 3369 } 3370 } 3371 3372 return TRUE; 3373 } 3374 3375 /* Generate the PLT slots together with the dynamic relocations needed 3376 for IFUNC symbols. */ 3377 3378 static void 3379 elf_s390_finish_ifunc_symbol (bfd *output_bfd, 3380 struct bfd_link_info *info, 3381 struct elf_link_hash_entry *h, 3382 struct elf_s390_link_hash_table *htab, 3383 bfd_vma iplt_offset, 3384 bfd_vma resolver_address) 3385 { 3386 bfd_vma iplt_index; 3387 bfd_vma got_offset; 3388 bfd_vma igotiplt_offset; 3389 Elf_Internal_Rela rela; 3390 bfd_byte *loc; 3391 asection *plt, *gotplt, *relplt; 3392 bfd_vma relative_offset; 3393 3394 if (htab->elf.iplt == NULL 3395 || htab->elf.igotplt == NULL 3396 || htab->elf.irelplt == NULL) 3397 abort (); 3398 3399 gotplt = htab->elf.igotplt; 3400 relplt = htab->elf.irelplt; 3401 3402 /* Index of the PLT slot within iplt section. */ 3403 iplt_index = iplt_offset / PLT_ENTRY_SIZE; 3404 plt = htab->elf.iplt; 3405 /* Offset into the igot.plt section. */ 3406 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE; 3407 /* Offset into the got section. */ 3408 got_offset = igotiplt_offset + gotplt->output_offset; 3409 3410 /* S390 uses halfwords for relative branch calc! */ 3411 relative_offset = - (plt->output_offset + 3412 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2; 3413 /* If offset is > 32768, branch to a previous branch 3414 390 can only handle +-64 K jumps. */ 3415 if ( -32768 > (int) relative_offset ) 3416 relative_offset 3417 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3418 3419 /* Fill in the entry in the procedure linkage table. */ 3420 if (!info->shared) 3421 { 3422 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry, 3423 PLT_ENTRY_SIZE); 3424 3425 /* Adjust jump to the first plt entry. */ 3426 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3427 plt->contents + iplt_offset + 20); 3428 3429 /* Push the GOT offset field. */ 3430 bfd_put_32 (output_bfd, 3431 (gotplt->output_section->vma 3432 + got_offset), 3433 plt->contents + iplt_offset + 24); 3434 } 3435 else if (got_offset < 4096) 3436 { 3437 /* The GOT offset is small enough to be used directly as 3438 displacement. */ 3439 memcpy (plt->contents + iplt_offset, 3440 elf_s390_plt_pic12_entry, 3441 PLT_ENTRY_SIZE); 3442 3443 /* Put in the GOT offset as displacement value. The 0xc000 3444 value comes from the first word of the plt entry. Look 3445 at the elf_s390_plt_pic16_entry content. */ 3446 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3447 plt->contents + iplt_offset + 2); 3448 3449 /* Adjust the jump to the first plt entry. */ 3450 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3451 plt->contents + iplt_offset + 20); 3452 } 3453 else if (got_offset < 32768) 3454 { 3455 /* The GOT offset is too big for a displacement but small 3456 enough to be a signed 16 bit immediate value as it can be 3457 used in an lhi instruction. */ 3458 memcpy (plt->contents + iplt_offset, 3459 elf_s390_plt_pic16_entry, 3460 PLT_ENTRY_SIZE); 3461 3462 /* Put in the GOT offset for the lhi instruction. */ 3463 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3464 plt->contents + iplt_offset + 2); 3465 3466 /* Adjust the jump to the first plt entry. */ 3467 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3468 plt->contents + iplt_offset + 20); 3469 } 3470 else 3471 { 3472 memcpy (plt->contents + iplt_offset, 3473 elf_s390_plt_pic_entry, 3474 PLT_ENTRY_SIZE); 3475 3476 /* Adjust the jump to the first plt entry. */ 3477 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3478 plt->contents + iplt_offset + 20); 3479 3480 /* Push the GOT offset field. */ 3481 bfd_put_32 (output_bfd, got_offset, 3482 plt->contents + iplt_offset + 24); 3483 } 3484 /* Insert offset into reloc. table here. */ 3485 bfd_put_32 (output_bfd, relplt->output_offset + 3486 iplt_index * RELA_ENTRY_SIZE, 3487 plt->contents + iplt_offset + 28); 3488 3489 /* Fill in the entry in the global offset table. 3490 Points to instruction after GOT offset. */ 3491 bfd_put_32 (output_bfd, 3492 (plt->output_section->vma 3493 + plt->output_offset 3494 + iplt_offset 3495 + 12), 3496 gotplt->contents + igotiplt_offset); 3497 3498 /* Fill in the entry in the .rela.plt section. */ 3499 rela.r_offset = gotplt->output_section->vma + got_offset; 3500 3501 if (!h 3502 || h->dynindx == -1 3503 || ((info->executable 3504 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 3505 && h->def_regular)) 3506 { 3507 /* The symbol can be locally resolved. */ 3508 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE); 3509 rela.r_addend = resolver_address; 3510 } 3511 else 3512 { 3513 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3514 rela.r_addend = 0; 3515 } 3516 3517 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE; 3518 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3519 } 3520 3521 /* Finish up dynamic symbol handling. We set the contents of various 3522 dynamic sections here. */ 3523 3524 static bfd_boolean 3525 elf_s390_finish_dynamic_symbol (bfd *output_bfd, 3526 struct bfd_link_info *info, 3527 struct elf_link_hash_entry *h, 3528 Elf_Internal_Sym *sym) 3529 { 3530 struct elf_s390_link_hash_table *htab; 3531 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; 3532 3533 htab = elf_s390_hash_table (info); 3534 3535 if (h->plt.offset != (bfd_vma) -1) 3536 { 3537 bfd_vma plt_index; 3538 bfd_vma got_offset; 3539 Elf_Internal_Rela rela; 3540 bfd_byte *loc; 3541 bfd_vma relative_offset; 3542 3543 /* This symbol has an entry in the procedure linkage table. Set 3544 it up. */ 3545 if (s390_is_ifunc_symbol_p (h)) 3546 { 3547 /* If we can resolve the IFUNC symbol locally we generate an 3548 IRELATIVE reloc. */ 3549 elf_s390_finish_ifunc_symbol (output_bfd, info, h, htab, h->plt.offset, 3550 eh->ifunc_resolver_address + 3551 eh->ifunc_resolver_section->output_offset + 3552 eh->ifunc_resolver_section->output_section->vma); 3553 /* Fallthrough. Handling of explicit GOT slots of IFUNC 3554 symbols is below. */ 3555 } 3556 else 3557 { 3558 if (h->dynindx == -1 3559 || htab->elf.splt == NULL 3560 || htab->elf.sgotplt == NULL 3561 || htab->elf.srelplt == NULL) 3562 abort (); 3563 3564 /* Calc. index no. 3565 Current offset - size first entry / entry size. */ 3566 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3567 3568 /* Offset in GOT is PLT index plus GOT headers(3) times 4, 3569 addr & GOT addr. */ 3570 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3571 3572 /* S390 uses halfwords for relative branch calc! */ 3573 relative_offset = - ((PLT_FIRST_ENTRY_SIZE + 3574 (PLT_ENTRY_SIZE * plt_index) + 18) / 2); 3575 /* If offset is > 32768, branch to a previous branch 3576 390 can only handle +-64 K jumps. */ 3577 if ( -32768 > (int) relative_offset ) 3578 relative_offset 3579 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2); 3580 3581 /* Fill in the entry in the procedure linkage table. */ 3582 if (!info->shared) 3583 { 3584 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry, 3585 PLT_ENTRY_SIZE); 3586 3587 /* Adjust jump to the first plt entry. */ 3588 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3589 htab->elf.splt->contents + h->plt.offset + 20); 3590 3591 /* Push the GOT offset field. */ 3592 bfd_put_32 (output_bfd, 3593 (htab->elf.sgotplt->output_section->vma 3594 + htab->elf.sgotplt->output_offset 3595 + got_offset), 3596 htab->elf.splt->contents + h->plt.offset + 24); 3597 } 3598 else if (got_offset < 4096) 3599 { 3600 /* The GOT offset is small enough to be used directly as 3601 displacement. */ 3602 memcpy (htab->elf.splt->contents + h->plt.offset, 3603 elf_s390_plt_pic12_entry, 3604 PLT_ENTRY_SIZE); 3605 3606 /* Put in the GOT offset as displacement value. The 0xc000 3607 value comes from the first word of the plt entry. Look 3608 at the elf_s390_plt_pic16_entry content. */ 3609 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset, 3610 htab->elf.splt->contents + h->plt.offset + 2); 3611 3612 /* Adjust the jump to the first plt entry. */ 3613 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3614 htab->elf.splt->contents + h->plt.offset + 20); 3615 } 3616 else if (got_offset < 32768) 3617 { 3618 /* The GOT offset is too big for a displacement but small 3619 enough to be a signed 16 bit immediate value as it can be 3620 used in an lhi instruction. */ 3621 memcpy (htab->elf.splt->contents + h->plt.offset, 3622 elf_s390_plt_pic16_entry, 3623 PLT_ENTRY_SIZE); 3624 3625 /* Put in the GOT offset for the lhi instruction. */ 3626 bfd_put_16 (output_bfd, (bfd_vma)got_offset, 3627 htab->elf.splt->contents + h->plt.offset + 2); 3628 3629 /* Adjust the jump to the first plt entry. */ 3630 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3631 htab->elf.splt->contents + h->plt.offset + 20); 3632 } 3633 else 3634 { 3635 memcpy (htab->elf.splt->contents + h->plt.offset, 3636 elf_s390_plt_pic_entry, 3637 PLT_ENTRY_SIZE); 3638 3639 /* Adjust the jump to the first plt entry. */ 3640 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16), 3641 htab->elf.splt->contents + h->plt.offset + 20); 3642 3643 /* Push the GOT offset field. */ 3644 bfd_put_32 (output_bfd, got_offset, 3645 htab->elf.splt->contents + h->plt.offset + 24); 3646 } 3647 /* Insert offset into reloc. table here. */ 3648 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 3649 htab->elf.splt->contents + h->plt.offset + 28); 3650 3651 /* Fill in the entry in the global offset table. 3652 Points to instruction after GOT offset. */ 3653 bfd_put_32 (output_bfd, 3654 (htab->elf.splt->output_section->vma 3655 + htab->elf.splt->output_offset 3656 + h->plt.offset 3657 + 12), 3658 htab->elf.sgotplt->contents + got_offset); 3659 3660 /* Fill in the entry in the .rela.plt section. */ 3661 rela.r_offset = (htab->elf.sgotplt->output_section->vma 3662 + htab->elf.sgotplt->output_offset 3663 + got_offset); 3664 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT); 3665 rela.r_addend = 0; 3666 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela); 3667 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3668 3669 if (!h->def_regular) 3670 { 3671 /* Mark the symbol as undefined, rather than as defined in 3672 the .plt section. Leave the value alone. This is a clue 3673 for the dynamic linker, to make function pointer 3674 comparisons work between an application and shared 3675 library. */ 3676 sym->st_shndx = SHN_UNDEF; 3677 } 3678 } 3679 } 3680 3681 if (h->got.offset != (bfd_vma) -1 3682 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD 3683 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE 3684 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT) 3685 { 3686 Elf_Internal_Rela rela; 3687 bfd_byte *loc; 3688 3689 /* This symbol has an entry in the global offset table. Set it 3690 up. */ 3691 3692 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3693 abort (); 3694 3695 rela.r_offset = (htab->elf.sgot->output_section->vma 3696 + htab->elf.sgot->output_offset 3697 + (h->got.offset &~ (bfd_vma) 1)); 3698 3699 /* If this is a static link, or it is a -Bsymbolic link and the 3700 symbol is defined locally or was forced to be local because 3701 of a version file, we just want to emit a RELATIVE reloc. 3702 The entry in the global offset table will already have been 3703 initialized in the relocate_section function. */ 3704 if (h->def_regular && s390_is_ifunc_symbol_p (h)) 3705 { 3706 if (info->shared) 3707 { 3708 /* An explicit GOT slot usage needs GLOB_DAT. If the 3709 symbol references local the implicit got.iplt slot 3710 will be used and the IRELATIVE reloc has been created 3711 above. */ 3712 goto do_glob_dat; 3713 } 3714 else 3715 { 3716 /* For non-shared objects explicit GOT slots must be 3717 filled with the PLT slot address for pointer 3718 equality reasons. */ 3719 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma 3720 + htab->elf.iplt->output_offset 3721 + h->plt.offset), 3722 htab->elf.sgot->contents + h->got.offset); 3723 return TRUE; 3724 } 3725 } 3726 else if (info->shared 3727 && SYMBOL_REFERENCES_LOCAL (info, h)) 3728 { 3729 /* If this is a static link, or it is a -Bsymbolic link and 3730 the symbol is defined locally or was forced to be local 3731 because of a version file, we just want to emit a 3732 RELATIVE reloc. The entry in the global offset table 3733 will already have been initialized in the 3734 relocate_section function. */ 3735 if (!h->def_regular) 3736 return FALSE; 3737 BFD_ASSERT((h->got.offset & 1) != 0); 3738 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE); 3739 rela.r_addend = (h->root.u.def.value 3740 + h->root.u.def.section->output_section->vma 3741 + h->root.u.def.section->output_offset); 3742 } 3743 else 3744 { 3745 BFD_ASSERT((h->got.offset & 1) == 0); 3746 do_glob_dat: 3747 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset); 3748 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT); 3749 rela.r_addend = 0; 3750 } 3751 3752 loc = htab->elf.srelgot->contents; 3753 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3754 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3755 } 3756 3757 if (h->needs_copy) 3758 { 3759 Elf_Internal_Rela rela; 3760 bfd_byte *loc; 3761 3762 /* This symbols needs a copy reloc. Set it up. */ 3763 3764 if (h->dynindx == -1 3765 || (h->root.type != bfd_link_hash_defined 3766 && h->root.type != bfd_link_hash_defweak) 3767 || htab->srelbss == NULL) 3768 abort (); 3769 3770 rela.r_offset = (h->root.u.def.value 3771 + h->root.u.def.section->output_section->vma 3772 + h->root.u.def.section->output_offset); 3773 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY); 3774 rela.r_addend = 0; 3775 loc = htab->srelbss->contents; 3776 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela); 3777 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3778 } 3779 3780 /* Mark some specially defined symbols as absolute. */ 3781 if (h == htab->elf.hdynamic 3782 || h == htab->elf.hgot 3783 || h == htab->elf.hplt) 3784 sym->st_shndx = SHN_ABS; 3785 3786 return TRUE; 3787 } 3788 3789 /* Used to decide how to sort relocs in an optimal manner for the 3790 dynamic linker, before writing them out. */ 3791 3792 static enum elf_reloc_type_class 3793 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3794 const asection *rel_sec ATTRIBUTE_UNUSED, 3795 const Elf_Internal_Rela *rela) 3796 { 3797 switch ((int) ELF32_R_TYPE (rela->r_info)) 3798 { 3799 case R_390_RELATIVE: 3800 return reloc_class_relative; 3801 case R_390_JMP_SLOT: 3802 return reloc_class_plt; 3803 case R_390_COPY: 3804 return reloc_class_copy; 3805 default: 3806 return reloc_class_normal; 3807 } 3808 } 3809 3810 /* Finish up the dynamic sections. */ 3811 3812 static bfd_boolean 3813 elf_s390_finish_dynamic_sections (bfd *output_bfd, 3814 struct bfd_link_info *info) 3815 { 3816 struct elf_s390_link_hash_table *htab; 3817 bfd *dynobj; 3818 asection *sdyn; 3819 bfd *ibfd; 3820 unsigned int i; 3821 3822 htab = elf_s390_hash_table (info); 3823 dynobj = htab->elf.dynobj; 3824 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3825 3826 if (htab->elf.dynamic_sections_created) 3827 { 3828 Elf32_External_Dyn *dyncon, *dynconend; 3829 3830 if (sdyn == NULL || htab->elf.sgot == NULL) 3831 abort (); 3832 3833 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3834 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3835 for (; dyncon < dynconend; dyncon++) 3836 { 3837 Elf_Internal_Dyn dyn; 3838 asection *s; 3839 3840 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3841 3842 switch (dyn.d_tag) 3843 { 3844 default: 3845 continue; 3846 3847 case DT_PLTGOT: 3848 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma; 3849 break; 3850 3851 case DT_JMPREL: 3852 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; 3853 break; 3854 3855 case DT_PLTRELSZ: 3856 s = htab->elf.srelplt->output_section; 3857 dyn.d_un.d_val = s->size; 3858 break; 3859 } 3860 3861 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3862 } 3863 3864 /* Fill in the special first entry in the procedure linkage table. */ 3865 if (htab->elf.splt && htab->elf.splt->size > 0) 3866 { 3867 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE); 3868 if (info->shared) 3869 { 3870 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry, 3871 PLT_FIRST_ENTRY_SIZE); 3872 } 3873 else 3874 { 3875 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry, 3876 PLT_FIRST_ENTRY_SIZE); 3877 bfd_put_32 (output_bfd, 3878 htab->elf.sgotplt->output_section->vma 3879 + htab->elf.sgotplt->output_offset, 3880 htab->elf.splt->contents + 24); 3881 } 3882 elf_section_data (htab->elf.splt->output_section) 3883 ->this_hdr.sh_entsize = 4; 3884 } 3885 3886 } 3887 3888 if (htab->elf.sgotplt) 3889 { 3890 /* Fill in the first three entries in the global offset table. */ 3891 if (htab->elf.sgotplt->size > 0) 3892 { 3893 bfd_put_32 (output_bfd, 3894 (sdyn == NULL ? (bfd_vma) 0 3895 : sdyn->output_section->vma + sdyn->output_offset), 3896 htab->elf.sgotplt->contents); 3897 /* One entry for shared object struct ptr. */ 3898 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4); 3899 /* One entry for _dl_runtime_resolve. */ 3900 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8); 3901 } 3902 3903 elf_section_data (htab->elf.sgotplt->output_section) 3904 ->this_hdr.sh_entsize = 4; 3905 } 3906 /* Finish dynamic symbol for local IFUNC symbols. */ 3907 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 3908 { 3909 struct plt_entry *local_plt; 3910 Elf_Internal_Sym *isym; 3911 Elf_Internal_Shdr *symtab_hdr; 3912 3913 symtab_hdr = &elf_symtab_hdr (ibfd); 3914 3915 local_plt = elf_s390_local_plt (ibfd); 3916 if (local_plt != NULL) 3917 for (i = 0; i < symtab_hdr->sh_info; i++) 3918 { 3919 if (local_plt[i].plt.offset != (bfd_vma) -1) 3920 { 3921 asection *sec = local_plt[i].sec; 3922 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i); 3923 if (isym == NULL) 3924 return FALSE; 3925 3926 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 3927 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab, 3928 local_plt[i].plt.offset, 3929 isym->st_value 3930 + sec->output_section->vma 3931 + sec->output_offset); 3932 3933 } 3934 } 3935 } 3936 return TRUE; 3937 } 3938 3939 static bfd_boolean 3940 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note) 3941 { 3942 int offset; 3943 unsigned int size; 3944 3945 switch (note->descsz) 3946 { 3947 default: 3948 return FALSE; 3949 3950 case 224: /* S/390 Linux. */ 3951 /* pr_cursig */ 3952 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 3953 3954 /* pr_pid */ 3955 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 3956 3957 /* pr_reg */ 3958 offset = 72; 3959 size = 144; 3960 break; 3961 } 3962 3963 /* Make a ".reg/999" section. */ 3964 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 3965 size, note->descpos + offset); 3966 } 3967 3968 /* Return address for Ith PLT stub in section PLT, for relocation REL 3969 or (bfd_vma) -1 if it should not be included. */ 3970 3971 static bfd_vma 3972 elf_s390_plt_sym_val (bfd_vma i, const asection *plt, 3973 const arelent *rel ATTRIBUTE_UNUSED) 3974 { 3975 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE; 3976 } 3977 3978 static bfd_boolean 3979 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 3980 { 3981 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags; 3982 return TRUE; 3983 } 3984 3985 3986 #define TARGET_BIG_SYM bfd_elf32_s390_vec 3987 #define TARGET_BIG_NAME "elf32-s390" 3988 #define ELF_ARCH bfd_arch_s390 3989 #define ELF_TARGET_ID S390_ELF_DATA 3990 #define ELF_MACHINE_CODE EM_S390 3991 #define ELF_MACHINE_ALT1 EM_S390_OLD 3992 #define ELF_MAXPAGESIZE 0x1000 3993 3994 #define elf_backend_can_gc_sections 1 3995 #define elf_backend_can_refcount 1 3996 #define elf_backend_want_got_plt 1 3997 #define elf_backend_plt_readonly 1 3998 #define elf_backend_want_plt_sym 0 3999 #define elf_backend_got_header_size 12 4000 #define elf_backend_rela_normal 1 4001 4002 #define elf_info_to_howto elf_s390_info_to_howto 4003 4004 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name 4005 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create 4006 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup 4007 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup 4008 4009 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data 4010 4011 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol 4012 #define elf_backend_check_relocs elf_s390_check_relocs 4013 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol 4014 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections 4015 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections 4016 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol 4017 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook 4018 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook 4019 #define elf_backend_reloc_type_class elf_s390_reloc_type_class 4020 #define elf_backend_relocate_section elf_s390_relocate_section 4021 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections 4022 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4023 #define elf_backend_grok_prstatus elf_s390_grok_prstatus 4024 #define elf_backend_plt_sym_val elf_s390_plt_sym_val 4025 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook 4026 4027 #define bfd_elf32_mkobject elf_s390_mkobject 4028 #define elf_backend_object_p elf_s390_object_p 4029 4030 #include "elf32-target.h" 4031
Indexes created Thu Apr 16 00:22:31 UTC 2026