| 1 | /* X86-64 specific support for ELF |
| 2 | Copyright (C) 2000-2018 Free Software Foundation, Inc. |
| 3 | Contributed by Jan Hubicka <jh@suse.cz>. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "elfxx-x86.h" |
| 23 | #include "elf-nacl.h" |
| 24 | #include "dwarf2.h" |
| 25 | #include "libiberty.h" |
| 26 | |
| 27 | #include "opcode/i386.h" |
| 28 | #include "elf/x86-64.h" |
| 29 | |
| 30 | #ifdef CORE_HEADER |
| 31 | #include <stdarg.h> |
| 32 | #include CORE_HEADER |
| 33 | #endif |
| 34 | |
| 35 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ |
| 36 | #define MINUS_ONE (~ (bfd_vma) 0) |
| 37 | |
| 38 | /* Since both 32-bit and 64-bit x86-64 encode relocation type in the |
| 39 | identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get |
| 40 | relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE |
| 41 | since they are the same. */ |
| 42 | |
| 43 | /* The relocation "howto" table. Order of fields: |
| 44 | type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, |
| 45 | special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ |
| 46 | static reloc_howto_type x86_64_elf_howto_table[] = |
| 47 | { |
| 48 | HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont, |
| 49 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, |
| 50 | FALSE), |
| 51 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 52 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, |
| 53 | FALSE), |
| 54 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 55 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, |
| 56 | TRUE), |
| 57 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 58 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, |
| 59 | FALSE), |
| 60 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 61 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, |
| 62 | TRUE), |
| 63 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 64 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, |
| 65 | FALSE), |
| 66 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 67 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, |
| 68 | MINUS_ONE, FALSE), |
| 69 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 70 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, |
| 71 | MINUS_ONE, FALSE), |
| 72 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 73 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, |
| 74 | MINUS_ONE, FALSE), |
| 75 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 76 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, |
| 77 | 0xffffffff, TRUE), |
| 78 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 79 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 80 | FALSE), |
| 81 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 82 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, |
| 83 | FALSE), |
| 84 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 85 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), |
| 86 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 87 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), |
| 88 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 89 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), |
| 90 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 91 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), |
| 92 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 93 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, |
| 94 | MINUS_ONE, FALSE), |
| 95 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 96 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, |
| 97 | MINUS_ONE, FALSE), |
| 98 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 99 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, |
| 100 | MINUS_ONE, FALSE), |
| 101 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 102 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, |
| 103 | 0xffffffff, TRUE), |
| 104 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 105 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, |
| 106 | 0xffffffff, TRUE), |
| 107 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 108 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, |
| 109 | 0xffffffff, FALSE), |
| 110 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 111 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, |
| 112 | 0xffffffff, TRUE), |
| 113 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 114 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, |
| 115 | 0xffffffff, FALSE), |
| 116 | HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, |
| 117 | bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, |
| 118 | TRUE), |
| 119 | HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 120 | bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", |
| 121 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 122 | HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 123 | bfd_elf_generic_reloc, "R_X86_64_GOTPC32", |
| 124 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 125 | HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 126 | bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, |
| 127 | FALSE), |
| 128 | HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 129 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, |
| 130 | MINUS_ONE, TRUE), |
| 131 | HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 132 | bfd_elf_generic_reloc, "R_X86_64_GOTPC64", |
| 133 | FALSE, MINUS_ONE, MINUS_ONE, TRUE), |
| 134 | HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 135 | bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, |
| 136 | MINUS_ONE, FALSE), |
| 137 | HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 138 | bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, |
| 139 | MINUS_ONE, FALSE), |
| 140 | HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 141 | bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff, |
| 142 | FALSE), |
| 143 | HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned, |
| 144 | bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE, |
| 145 | FALSE), |
| 146 | HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, |
| 147 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 148 | "R_X86_64_GOTPC32_TLSDESC", |
| 149 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 150 | HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, |
| 151 | complain_overflow_dont, bfd_elf_generic_reloc, |
| 152 | "R_X86_64_TLSDESC_CALL", |
| 153 | FALSE, 0, 0, FALSE), |
| 154 | HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, |
| 155 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 156 | "R_X86_64_TLSDESC", |
| 157 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 158 | HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 159 | bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE, |
| 160 | MINUS_ONE, FALSE), |
| 161 | HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 162 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE, |
| 163 | MINUS_ONE, FALSE), |
| 164 | HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 165 | bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff, |
| 166 | TRUE), |
| 167 | HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 168 | bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff, |
| 169 | TRUE), |
| 170 | HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 171 | bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff, |
| 172 | 0xffffffff, TRUE), |
| 173 | HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 174 | bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff, |
| 175 | 0xffffffff, TRUE), |
| 176 | |
| 177 | /* We have a gap in the reloc numbers here. |
| 178 | R_X86_64_standard counts the number up to this point, and |
| 179 | R_X86_64_vt_offset is the value to subtract from a reloc type of |
| 180 | R_X86_64_GNU_VT* to form an index into this table. */ |
| 181 | #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1) |
| 182 | #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) |
| 183 | |
| 184 | /* GNU extension to record C++ vtable hierarchy. */ |
| 185 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 186 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), |
| 187 | |
| 188 | /* GNU extension to record C++ vtable member usage. */ |
| 189 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 190 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, |
| 191 | FALSE), |
| 192 | |
| 193 | /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */ |
| 194 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 195 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 196 | FALSE) |
| 197 | }; |
| 198 | |
| 199 | /* Set if a relocation is converted from a GOTPCREL relocation. */ |
| 200 | #define R_X86_64_converted_reloc_bit (1 << 7) |
| 201 | |
| 202 | #define X86_PCREL_TYPE_P(TYPE) \ |
| 203 | ( ((TYPE) == R_X86_64_PC8) \ |
| 204 | || ((TYPE) == R_X86_64_PC16) \ |
| 205 | || ((TYPE) == R_X86_64_PC32) \ |
| 206 | || ((TYPE) == R_X86_64_PC32_BND) \ |
| 207 | || ((TYPE) == R_X86_64_PC64)) |
| 208 | |
| 209 | #define X86_SIZE_TYPE_P(TYPE) \ |
| 210 | ((TYPE) == R_X86_64_SIZE32 || (TYPE) == R_X86_64_SIZE64) |
| 211 | |
| 212 | /* Map BFD relocs to the x86_64 elf relocs. */ |
| 213 | struct elf_reloc_map |
| 214 | { |
| 215 | bfd_reloc_code_real_type bfd_reloc_val; |
| 216 | unsigned char elf_reloc_val; |
| 217 | }; |
| 218 | |
| 219 | static const struct elf_reloc_map x86_64_reloc_map[] = |
| 220 | { |
| 221 | { BFD_RELOC_NONE, R_X86_64_NONE, }, |
| 222 | { BFD_RELOC_64, R_X86_64_64, }, |
| 223 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, |
| 224 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, |
| 225 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, |
| 226 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, |
| 227 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, |
| 228 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, |
| 229 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, |
| 230 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, |
| 231 | { BFD_RELOC_32, R_X86_64_32, }, |
| 232 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, |
| 233 | { BFD_RELOC_16, R_X86_64_16, }, |
| 234 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, |
| 235 | { BFD_RELOC_8, R_X86_64_8, }, |
| 236 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, |
| 237 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, |
| 238 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, |
| 239 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, |
| 240 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, |
| 241 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, |
| 242 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, |
| 243 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, |
| 244 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, |
| 245 | { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, |
| 246 | { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, |
| 247 | { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, |
| 248 | { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, |
| 249 | { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, |
| 250 | { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, |
| 251 | { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, |
| 252 | { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, |
| 253 | { BFD_RELOC_SIZE32, R_X86_64_SIZE32, }, |
| 254 | { BFD_RELOC_SIZE64, R_X86_64_SIZE64, }, |
| 255 | { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, |
| 256 | { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, |
| 257 | { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, |
| 258 | { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, |
| 259 | { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, }, |
| 260 | { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, }, |
| 261 | { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, }, |
| 262 | { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, }, |
| 263 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
| 264 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, |
| 265 | }; |
| 266 | |
| 267 | static reloc_howto_type * |
| 268 | elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) |
| 269 | { |
| 270 | unsigned i; |
| 271 | |
| 272 | if (r_type == (unsigned int) R_X86_64_32) |
| 273 | { |
| 274 | if (ABI_64_P (abfd)) |
| 275 | i = r_type; |
| 276 | else |
| 277 | i = ARRAY_SIZE (x86_64_elf_howto_table) - 1; |
| 278 | } |
| 279 | else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT |
| 280 | || r_type >= (unsigned int) R_X86_64_max) |
| 281 | { |
| 282 | if (r_type >= (unsigned int) R_X86_64_standard) |
| 283 | { |
| 284 | /* xgettext:c-format */ |
| 285 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 286 | abfd, r_type); |
| 287 | bfd_set_error (bfd_error_bad_value); |
| 288 | return NULL; |
| 289 | } |
| 290 | i = r_type; |
| 291 | } |
| 292 | else |
| 293 | i = r_type - (unsigned int) R_X86_64_vt_offset; |
| 294 | BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); |
| 295 | return &x86_64_elf_howto_table[i]; |
| 296 | } |
| 297 | |
| 298 | /* Given a BFD reloc type, return a HOWTO structure. */ |
| 299 | static reloc_howto_type * |
| 300 | elf_x86_64_reloc_type_lookup (bfd *abfd, |
| 301 | bfd_reloc_code_real_type code) |
| 302 | { |
| 303 | unsigned int i; |
| 304 | |
| 305 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); |
| 306 | i++) |
| 307 | { |
| 308 | if (x86_64_reloc_map[i].bfd_reloc_val == code) |
| 309 | return elf_x86_64_rtype_to_howto (abfd, |
| 310 | x86_64_reloc_map[i].elf_reloc_val); |
| 311 | } |
| 312 | return NULL; |
| 313 | } |
| 314 | |
| 315 | static reloc_howto_type * |
| 316 | elf_x86_64_reloc_name_lookup (bfd *abfd, |
| 317 | const char *r_name) |
| 318 | { |
| 319 | unsigned int i; |
| 320 | |
| 321 | if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0) |
| 322 | { |
| 323 | /* Get x32 R_X86_64_32. */ |
| 324 | reloc_howto_type *reloc |
| 325 | = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1]; |
| 326 | BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32); |
| 327 | return reloc; |
| 328 | } |
| 329 | |
| 330 | for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++) |
| 331 | if (x86_64_elf_howto_table[i].name != NULL |
| 332 | && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) |
| 333 | return &x86_64_elf_howto_table[i]; |
| 334 | |
| 335 | return NULL; |
| 336 | } |
| 337 | |
| 338 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
| 339 | |
| 340 | static bfd_boolean |
| 341 | elf_x86_64_info_to_howto (bfd *abfd, arelent *cache_ptr, |
| 342 | Elf_Internal_Rela *dst) |
| 343 | { |
| 344 | unsigned r_type; |
| 345 | |
| 346 | r_type = ELF32_R_TYPE (dst->r_info); |
| 347 | cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type); |
| 348 | if (cache_ptr->howto == NULL) |
| 349 | return FALSE; |
| 350 | BFD_ASSERT (r_type == cache_ptr->howto->type || cache_ptr->howto->type == R_X86_64_NONE); |
| 351 | return TRUE; |
| 352 | } |
| 353 | \f |
| 354 | /* Support for core dump NOTE sections. */ |
| 355 | static bfd_boolean |
| 356 | elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 357 | { |
| 358 | int offset; |
| 359 | size_t size; |
| 360 | |
| 361 | switch (note->descsz) |
| 362 | { |
| 363 | default: |
| 364 | return FALSE; |
| 365 | |
| 366 | case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */ |
| 367 | /* pr_cursig */ |
| 368 | elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); |
| 369 | |
| 370 | /* pr_pid */ |
| 371 | elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); |
| 372 | |
| 373 | /* pr_reg */ |
| 374 | offset = 72; |
| 375 | size = 216; |
| 376 | |
| 377 | break; |
| 378 | |
| 379 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ |
| 380 | /* pr_cursig */ |
| 381 | elf_tdata (abfd)->core->signal |
| 382 | = bfd_get_16 (abfd, note->descdata + 12); |
| 383 | |
| 384 | /* pr_pid */ |
| 385 | elf_tdata (abfd)->core->lwpid |
| 386 | = bfd_get_32 (abfd, note->descdata + 32); |
| 387 | |
| 388 | /* pr_reg */ |
| 389 | offset = 112; |
| 390 | size = 216; |
| 391 | |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | /* Make a ".reg/999" section. */ |
| 396 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 397 | size, note->descpos + offset); |
| 398 | } |
| 399 | |
| 400 | static bfd_boolean |
| 401 | elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 402 | { |
| 403 | switch (note->descsz) |
| 404 | { |
| 405 | default: |
| 406 | return FALSE; |
| 407 | |
| 408 | case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */ |
| 409 | elf_tdata (abfd)->core->pid |
| 410 | = bfd_get_32 (abfd, note->descdata + 12); |
| 411 | elf_tdata (abfd)->core->program |
| 412 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 413 | elf_tdata (abfd)->core->command |
| 414 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 415 | break; |
| 416 | |
| 417 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ |
| 418 | elf_tdata (abfd)->core->pid |
| 419 | = bfd_get_32 (abfd, note->descdata + 24); |
| 420 | elf_tdata (abfd)->core->program |
| 421 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); |
| 422 | elf_tdata (abfd)->core->command |
| 423 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); |
| 424 | } |
| 425 | |
| 426 | /* Note that for some reason, a spurious space is tacked |
| 427 | onto the end of the args in some (at least one anyway) |
| 428 | implementations, so strip it off if it exists. */ |
| 429 | |
| 430 | { |
| 431 | char *command = elf_tdata (abfd)->core->command; |
| 432 | int n = strlen (command); |
| 433 | |
| 434 | if (0 < n && command[n - 1] == ' ') |
| 435 | command[n - 1] = '\0'; |
| 436 | } |
| 437 | |
| 438 | return TRUE; |
| 439 | } |
| 440 | |
| 441 | #ifdef CORE_HEADER |
| 442 | # if GCC_VERSION >= 8000 |
| 443 | # pragma GCC diagnostic push |
| 444 | # pragma GCC diagnostic ignored "-Wstringop-truncation" |
| 445 | # endif |
| 446 | static char * |
| 447 | elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz, |
| 448 | int note_type, ...) |
| 449 | { |
| 450 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 451 | va_list ap; |
| 452 | const char *fname, *psargs; |
| 453 | long pid; |
| 454 | int cursig; |
| 455 | const void *gregs; |
| 456 | |
| 457 | switch (note_type) |
| 458 | { |
| 459 | default: |
| 460 | return NULL; |
| 461 | |
| 462 | case NT_PRPSINFO: |
| 463 | va_start (ap, note_type); |
| 464 | fname = va_arg (ap, const char *); |
| 465 | psargs = va_arg (ap, const char *); |
| 466 | va_end (ap); |
| 467 | |
| 468 | if (bed->s->elfclass == ELFCLASS32) |
| 469 | { |
| 470 | prpsinfo32_t data; |
| 471 | memset (&data, 0, sizeof (data)); |
| 472 | strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); |
| 473 | strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); |
| 474 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 475 | &data, sizeof (data)); |
| 476 | } |
| 477 | else |
| 478 | { |
| 479 | prpsinfo64_t data; |
| 480 | memset (&data, 0, sizeof (data)); |
| 481 | strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); |
| 482 | strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); |
| 483 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 484 | &data, sizeof (data)); |
| 485 | } |
| 486 | /* NOTREACHED */ |
| 487 | |
| 488 | case NT_PRSTATUS: |
| 489 | va_start (ap, note_type); |
| 490 | pid = va_arg (ap, long); |
| 491 | cursig = va_arg (ap, int); |
| 492 | gregs = va_arg (ap, const void *); |
| 493 | va_end (ap); |
| 494 | |
| 495 | if (bed->s->elfclass == ELFCLASS32) |
| 496 | { |
| 497 | if (bed->elf_machine_code == EM_X86_64) |
| 498 | { |
| 499 | prstatusx32_t prstat; |
| 500 | memset (&prstat, 0, sizeof (prstat)); |
| 501 | prstat.pr_pid = pid; |
| 502 | prstat.pr_cursig = cursig; |
| 503 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); |
| 504 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 505 | &prstat, sizeof (prstat)); |
| 506 | } |
| 507 | else |
| 508 | { |
| 509 | prstatus32_t prstat; |
| 510 | memset (&prstat, 0, sizeof (prstat)); |
| 511 | prstat.pr_pid = pid; |
| 512 | prstat.pr_cursig = cursig; |
| 513 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); |
| 514 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 515 | &prstat, sizeof (prstat)); |
| 516 | } |
| 517 | } |
| 518 | else |
| 519 | { |
| 520 | prstatus64_t prstat; |
| 521 | memset (&prstat, 0, sizeof (prstat)); |
| 522 | prstat.pr_pid = pid; |
| 523 | prstat.pr_cursig = cursig; |
| 524 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); |
| 525 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 526 | &prstat, sizeof (prstat)); |
| 527 | } |
| 528 | } |
| 529 | /* NOTREACHED */ |
| 530 | } |
| 531 | # if GCC_VERSION >= 8000 |
| 532 | # pragma GCC diagnostic pop |
| 533 | # endif |
| 534 | #endif |
| 535 | \f |
| 536 | /* Functions for the x86-64 ELF linker. */ |
| 537 | |
| 538 | /* The size in bytes of an entry in the global offset table. */ |
| 539 | |
| 540 | #define GOT_ENTRY_SIZE 8 |
| 541 | |
| 542 | /* The size in bytes of an entry in the lazy procedure linkage table. */ |
| 543 | |
| 544 | #define LAZY_PLT_ENTRY_SIZE 16 |
| 545 | |
| 546 | /* The size in bytes of an entry in the non-lazy procedure linkage |
| 547 | table. */ |
| 548 | |
| 549 | #define NON_LAZY_PLT_ENTRY_SIZE 8 |
| 550 | |
| 551 | /* The first entry in a lazy procedure linkage table looks like this. |
| 552 | See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this |
| 553 | works. */ |
| 554 | |
| 555 | static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] = |
| 556 | { |
| 557 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 558 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ |
| 559 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ |
| 560 | }; |
| 561 | |
| 562 | /* Subsequent entries in a lazy procedure linkage table look like this. */ |
| 563 | |
| 564 | static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 565 | { |
| 566 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 567 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 568 | 0x68, /* pushq immediate */ |
| 569 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 570 | 0xe9, /* jmp relative */ |
| 571 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ |
| 572 | }; |
| 573 | |
| 574 | /* The first entry in a lazy procedure linkage table with BND prefix |
| 575 | like this. */ |
| 576 | |
| 577 | static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] = |
| 578 | { |
| 579 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 580 | 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */ |
| 581 | 0x0f, 0x1f, 0 /* nopl (%rax) */ |
| 582 | }; |
| 583 | |
| 584 | /* Subsequent entries for branches with BND prefx in a lazy procedure |
| 585 | linkage table look like this. */ |
| 586 | |
| 587 | static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 588 | { |
| 589 | 0x68, 0, 0, 0, 0, /* pushq immediate */ |
| 590 | 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ |
| 591 | 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */ |
| 592 | }; |
| 593 | |
| 594 | /* The first entry in the IBT-enabled lazy procedure linkage table is the |
| 595 | the same as the lazy PLT with BND prefix so that bound registers are |
| 596 | preserved when control is passed to dynamic linker. Subsequent |
| 597 | entries for a IBT-enabled lazy procedure linkage table look like |
| 598 | this. */ |
| 599 | |
| 600 | static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 601 | { |
| 602 | 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ |
| 603 | 0x68, 0, 0, 0, 0, /* pushq immediate */ |
| 604 | 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ |
| 605 | 0x90 /* nop */ |
| 606 | }; |
| 607 | |
| 608 | /* The first entry in the x32 IBT-enabled lazy procedure linkage table |
| 609 | is the same as the normal lazy PLT. Subsequent entries for an |
| 610 | x32 IBT-enabled lazy procedure linkage table look like this. */ |
| 611 | |
| 612 | static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 613 | { |
| 614 | 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ |
| 615 | 0x68, 0, 0, 0, 0, /* pushq immediate */ |
| 616 | 0xe9, 0, 0, 0, 0, /* jmpq relative */ |
| 617 | 0x66, 0x90 /* xchg %ax,%ax */ |
| 618 | }; |
| 619 | |
| 620 | /* Entries in the non-lazey procedure linkage table look like this. */ |
| 621 | |
| 622 | static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = |
| 623 | { |
| 624 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 625 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 626 | 0x66, 0x90 /* xchg %ax,%ax */ |
| 627 | }; |
| 628 | |
| 629 | /* Entries for branches with BND prefix in the non-lazey procedure |
| 630 | linkage table look like this. */ |
| 631 | |
| 632 | static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = |
| 633 | { |
| 634 | 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ |
| 635 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 636 | 0x90 /* nop */ |
| 637 | }; |
| 638 | |
| 639 | /* Entries for branches with IBT-enabled in the non-lazey procedure |
| 640 | linkage table look like this. They have the same size as the lazy |
| 641 | PLT entry. */ |
| 642 | |
| 643 | static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 644 | { |
| 645 | 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ |
| 646 | 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ |
| 647 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 648 | 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */ |
| 649 | }; |
| 650 | |
| 651 | /* Entries for branches with IBT-enabled in the x32 non-lazey procedure |
| 652 | linkage table look like this. They have the same size as the lazy |
| 653 | PLT entry. */ |
| 654 | |
| 655 | static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 656 | { |
| 657 | 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ |
| 658 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 659 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 660 | 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ |
| 661 | }; |
| 662 | |
| 663 | /* The TLSDESC entry in a lazy procedure linkage table. */ |
| 664 | static const bfd_byte elf_x86_64_tlsdesc_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 665 | { |
| 666 | 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ |
| 667 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 668 | 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */ |
| 669 | }; |
| 670 | |
| 671 | /* .eh_frame covering the lazy .plt section. */ |
| 672 | |
| 673 | static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] = |
| 674 | { |
| 675 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 676 | 0, 0, 0, 0, /* CIE ID */ |
| 677 | 1, /* CIE version */ |
| 678 | 'z', 'R', 0, /* Augmentation string */ |
| 679 | 1, /* Code alignment factor */ |
| 680 | 0x78, /* Data alignment factor */ |
| 681 | 16, /* Return address column */ |
| 682 | 1, /* Augmentation size */ |
| 683 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 684 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 685 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 686 | DW_CFA_nop, DW_CFA_nop, |
| 687 | |
| 688 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 689 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 690 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 691 | 0, 0, 0, 0, /* .plt size goes here */ |
| 692 | 0, /* Augmentation size */ |
| 693 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 694 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 695 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 696 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 697 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 698 | 11, /* Block length */ |
| 699 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 700 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 701 | DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, |
| 702 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 703 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 704 | }; |
| 705 | |
| 706 | /* .eh_frame covering the lazy BND .plt section. */ |
| 707 | |
| 708 | static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] = |
| 709 | { |
| 710 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 711 | 0, 0, 0, 0, /* CIE ID */ |
| 712 | 1, /* CIE version */ |
| 713 | 'z', 'R', 0, /* Augmentation string */ |
| 714 | 1, /* Code alignment factor */ |
| 715 | 0x78, /* Data alignment factor */ |
| 716 | 16, /* Return address column */ |
| 717 | 1, /* Augmentation size */ |
| 718 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 719 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 720 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 721 | DW_CFA_nop, DW_CFA_nop, |
| 722 | |
| 723 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 724 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 725 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 726 | 0, 0, 0, 0, /* .plt size goes here */ |
| 727 | 0, /* Augmentation size */ |
| 728 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 729 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 730 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 731 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 732 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 733 | 11, /* Block length */ |
| 734 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 735 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 736 | DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge, |
| 737 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 738 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 739 | }; |
| 740 | |
| 741 | /* .eh_frame covering the lazy .plt section with IBT-enabled. */ |
| 742 | |
| 743 | static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] = |
| 744 | { |
| 745 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 746 | 0, 0, 0, 0, /* CIE ID */ |
| 747 | 1, /* CIE version */ |
| 748 | 'z', 'R', 0, /* Augmentation string */ |
| 749 | 1, /* Code alignment factor */ |
| 750 | 0x78, /* Data alignment factor */ |
| 751 | 16, /* Return address column */ |
| 752 | 1, /* Augmentation size */ |
| 753 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 754 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 755 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 756 | DW_CFA_nop, DW_CFA_nop, |
| 757 | |
| 758 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 759 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 760 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 761 | 0, 0, 0, 0, /* .plt size goes here */ |
| 762 | 0, /* Augmentation size */ |
| 763 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 764 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 765 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 766 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 767 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 768 | 11, /* Block length */ |
| 769 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 770 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 771 | DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge, |
| 772 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 773 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 774 | }; |
| 775 | |
| 776 | /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */ |
| 777 | |
| 778 | static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] = |
| 779 | { |
| 780 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 781 | 0, 0, 0, 0, /* CIE ID */ |
| 782 | 1, /* CIE version */ |
| 783 | 'z', 'R', 0, /* Augmentation string */ |
| 784 | 1, /* Code alignment factor */ |
| 785 | 0x78, /* Data alignment factor */ |
| 786 | 16, /* Return address column */ |
| 787 | 1, /* Augmentation size */ |
| 788 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 789 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 790 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 791 | DW_CFA_nop, DW_CFA_nop, |
| 792 | |
| 793 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 794 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 795 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 796 | 0, 0, 0, 0, /* .plt size goes here */ |
| 797 | 0, /* Augmentation size */ |
| 798 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 799 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 800 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 801 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 802 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 803 | 11, /* Block length */ |
| 804 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 805 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 806 | DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge, |
| 807 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 808 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 809 | }; |
| 810 | |
| 811 | /* .eh_frame covering the non-lazy .plt section. */ |
| 812 | |
| 813 | static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] = |
| 814 | { |
| 815 | #define PLT_GOT_FDE_LENGTH 20 |
| 816 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 817 | 0, 0, 0, 0, /* CIE ID */ |
| 818 | 1, /* CIE version */ |
| 819 | 'z', 'R', 0, /* Augmentation string */ |
| 820 | 1, /* Code alignment factor */ |
| 821 | 0x78, /* Data alignment factor */ |
| 822 | 16, /* Return address column */ |
| 823 | 1, /* Augmentation size */ |
| 824 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 825 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 826 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 827 | DW_CFA_nop, DW_CFA_nop, |
| 828 | |
| 829 | PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 830 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 831 | 0, 0, 0, 0, /* the start of non-lazy .plt goes here */ |
| 832 | 0, 0, 0, 0, /* non-lazy .plt size goes here */ |
| 833 | 0, /* Augmentation size */ |
| 834 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, |
| 835 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 836 | }; |
| 837 | |
| 838 | /* These are the standard parameters. */ |
| 839 | static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt = |
| 840 | { |
| 841 | elf_x86_64_lazy_plt0_entry, /* plt0_entry */ |
| 842 | LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ |
| 843 | elf_x86_64_lazy_plt_entry, /* plt_entry */ |
| 844 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 845 | elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ |
| 846 | LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ |
| 847 | 6, /* plt_tlsdesc_got1_offset */ |
| 848 | 12, /* plt_tlsdesc_got2_offset */ |
| 849 | 10, /* plt_tlsdesc_got1_insn_end */ |
| 850 | 16, /* plt_tlsdesc_got2_insn_end */ |
| 851 | 2, /* plt0_got1_offset */ |
| 852 | 8, /* plt0_got2_offset */ |
| 853 | 12, /* plt0_got2_insn_end */ |
| 854 | 2, /* plt_got_offset */ |
| 855 | 7, /* plt_reloc_offset */ |
| 856 | 12, /* plt_plt_offset */ |
| 857 | 6, /* plt_got_insn_size */ |
| 858 | LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */ |
| 859 | 6, /* plt_lazy_offset */ |
| 860 | elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */ |
| 861 | elf_x86_64_lazy_plt_entry, /* pic_plt_entry */ |
| 862 | elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */ |
| 863 | sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */ |
| 864 | }; |
| 865 | |
| 866 | static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt = |
| 867 | { |
| 868 | elf_x86_64_non_lazy_plt_entry, /* plt_entry */ |
| 869 | elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */ |
| 870 | NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 871 | 2, /* plt_got_offset */ |
| 872 | 6, /* plt_got_insn_size */ |
| 873 | elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ |
| 874 | sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ |
| 875 | }; |
| 876 | |
| 877 | static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt = |
| 878 | { |
| 879 | elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */ |
| 880 | LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ |
| 881 | elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */ |
| 882 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 883 | elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ |
| 884 | LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ |
| 885 | 6, /* plt_tlsdesc_got1_offset */ |
| 886 | 12, /* plt_tlsdesc_got2_offset */ |
| 887 | 10, /* plt_tlsdesc_got1_insn_end */ |
| 888 | 16, /* plt_tlsdesc_got2_insn_end */ |
| 889 | 2, /* plt0_got1_offset */ |
| 890 | 1+8, /* plt0_got2_offset */ |
| 891 | 1+12, /* plt0_got2_insn_end */ |
| 892 | 1+2, /* plt_got_offset */ |
| 893 | 1, /* plt_reloc_offset */ |
| 894 | 7, /* plt_plt_offset */ |
| 895 | 1+6, /* plt_got_insn_size */ |
| 896 | 11, /* plt_plt_insn_end */ |
| 897 | 0, /* plt_lazy_offset */ |
| 898 | elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */ |
| 899 | elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */ |
| 900 | elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */ |
| 901 | sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */ |
| 902 | }; |
| 903 | |
| 904 | static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt = |
| 905 | { |
| 906 | elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */ |
| 907 | elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */ |
| 908 | NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 909 | 1+2, /* plt_got_offset */ |
| 910 | 1+6, /* plt_got_insn_size */ |
| 911 | elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ |
| 912 | sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ |
| 913 | }; |
| 914 | |
| 915 | static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt = |
| 916 | { |
| 917 | elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */ |
| 918 | LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ |
| 919 | elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */ |
| 920 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 921 | elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ |
| 922 | LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ |
| 923 | 6, /* plt_tlsdesc_got1_offset */ |
| 924 | 12, /* plt_tlsdesc_got2_offset */ |
| 925 | 10, /* plt_tlsdesc_got1_insn_end */ |
| 926 | 16, /* plt_tlsdesc_got2_insn_end */ |
| 927 | 2, /* plt0_got1_offset */ |
| 928 | 1+8, /* plt0_got2_offset */ |
| 929 | 1+12, /* plt0_got2_insn_end */ |
| 930 | 4+1+2, /* plt_got_offset */ |
| 931 | 4+1, /* plt_reloc_offset */ |
| 932 | 4+1+6, /* plt_plt_offset */ |
| 933 | 4+1+6, /* plt_got_insn_size */ |
| 934 | 4+1+5+5, /* plt_plt_insn_end */ |
| 935 | 0, /* plt_lazy_offset */ |
| 936 | elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */ |
| 937 | elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */ |
| 938 | elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ |
| 939 | sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ |
| 940 | }; |
| 941 | |
| 942 | static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt = |
| 943 | { |
| 944 | elf_x86_64_lazy_plt0_entry, /* plt0_entry */ |
| 945 | LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ |
| 946 | elf_x32_lazy_ibt_plt_entry, /* plt_entry */ |
| 947 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 948 | elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ |
| 949 | LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ |
| 950 | 6, /* plt_tlsdesc_got1_offset */ |
| 951 | 12, /* plt_tlsdesc_got2_offset */ |
| 952 | 10, /* plt_tlsdesc_got1_insn_end */ |
| 953 | 16, /* plt_tlsdesc_got2_insn_end */ |
| 954 | 2, /* plt0_got1_offset */ |
| 955 | 8, /* plt0_got2_offset */ |
| 956 | 12, /* plt0_got2_insn_end */ |
| 957 | 4+2, /* plt_got_offset */ |
| 958 | 4+1, /* plt_reloc_offset */ |
| 959 | 4+6, /* plt_plt_offset */ |
| 960 | 4+6, /* plt_got_insn_size */ |
| 961 | 4+5+5, /* plt_plt_insn_end */ |
| 962 | 0, /* plt_lazy_offset */ |
| 963 | elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */ |
| 964 | elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */ |
| 965 | elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ |
| 966 | sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ |
| 967 | }; |
| 968 | |
| 969 | static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt = |
| 970 | { |
| 971 | elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */ |
| 972 | elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */ |
| 973 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 974 | 4+1+2, /* plt_got_offset */ |
| 975 | 4+1+6, /* plt_got_insn_size */ |
| 976 | elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ |
| 977 | sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ |
| 978 | }; |
| 979 | |
| 980 | static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt = |
| 981 | { |
| 982 | elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */ |
| 983 | elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */ |
| 984 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 985 | 4+2, /* plt_got_offset */ |
| 986 | 4+6, /* plt_got_insn_size */ |
| 987 | elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ |
| 988 | sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ |
| 989 | }; |
| 990 | |
| 991 | static const struct elf_x86_backend_data elf_x86_64_arch_bed = |
| 992 | { |
| 993 | is_normal /* os */ |
| 994 | }; |
| 995 | |
| 996 | #define elf_backend_arch_data &elf_x86_64_arch_bed |
| 997 | |
| 998 | static bfd_boolean |
| 999 | elf64_x86_64_elf_object_p (bfd *abfd) |
| 1000 | { |
| 1001 | /* Set the right machine number for an x86-64 elf64 file. */ |
| 1002 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); |
| 1003 | return TRUE; |
| 1004 | } |
| 1005 | |
| 1006 | static bfd_boolean |
| 1007 | elf32_x86_64_elf_object_p (bfd *abfd) |
| 1008 | { |
| 1009 | /* Set the right machine number for an x86-64 elf32 file. */ |
| 1010 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32); |
| 1011 | return TRUE; |
| 1012 | } |
| 1013 | |
| 1014 | /* Return TRUE if the TLS access code sequence support transition |
| 1015 | from R_TYPE. */ |
| 1016 | |
| 1017 | static bfd_boolean |
| 1018 | elf_x86_64_check_tls_transition (bfd *abfd, |
| 1019 | struct bfd_link_info *info, |
| 1020 | asection *sec, |
| 1021 | bfd_byte *contents, |
| 1022 | Elf_Internal_Shdr *symtab_hdr, |
| 1023 | struct elf_link_hash_entry **sym_hashes, |
| 1024 | unsigned int r_type, |
| 1025 | const Elf_Internal_Rela *rel, |
| 1026 | const Elf_Internal_Rela *relend) |
| 1027 | { |
| 1028 | unsigned int val; |
| 1029 | unsigned long r_symndx; |
| 1030 | bfd_boolean largepic = FALSE; |
| 1031 | struct elf_link_hash_entry *h; |
| 1032 | bfd_vma offset; |
| 1033 | struct elf_x86_link_hash_table *htab; |
| 1034 | bfd_byte *call; |
| 1035 | bfd_boolean indirect_call; |
| 1036 | |
| 1037 | htab = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 1038 | offset = rel->r_offset; |
| 1039 | switch (r_type) |
| 1040 | { |
| 1041 | case R_X86_64_TLSGD: |
| 1042 | case R_X86_64_TLSLD: |
| 1043 | if ((rel + 1) >= relend) |
| 1044 | return FALSE; |
| 1045 | |
| 1046 | if (r_type == R_X86_64_TLSGD) |
| 1047 | { |
| 1048 | /* Check transition from GD access model. For 64bit, only |
| 1049 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 1050 | .word 0x6666; rex64; call __tls_get_addr@PLT |
| 1051 | or |
| 1052 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 1053 | .byte 0x66; rex64 |
| 1054 | call *__tls_get_addr@GOTPCREL(%rip) |
| 1055 | which may be converted to |
| 1056 | addr32 call __tls_get_addr |
| 1057 | can transit to different access model. For 32bit, only |
| 1058 | leaq foo@tlsgd(%rip), %rdi |
| 1059 | .word 0x6666; rex64; call __tls_get_addr@PLT |
| 1060 | or |
| 1061 | leaq foo@tlsgd(%rip), %rdi |
| 1062 | .byte 0x66; rex64 |
| 1063 | call *__tls_get_addr@GOTPCREL(%rip) |
| 1064 | which may be converted to |
| 1065 | addr32 call __tls_get_addr |
| 1066 | can transit to different access model. For largepic, |
| 1067 | we also support: |
| 1068 | leaq foo@tlsgd(%rip), %rdi |
| 1069 | movabsq $__tls_get_addr@pltoff, %rax |
| 1070 | addq $r15, %rax |
| 1071 | call *%rax |
| 1072 | or |
| 1073 | leaq foo@tlsgd(%rip), %rdi |
| 1074 | movabsq $__tls_get_addr@pltoff, %rax |
| 1075 | addq $rbx, %rax |
| 1076 | call *%rax */ |
| 1077 | |
| 1078 | static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d }; |
| 1079 | |
| 1080 | if ((offset + 12) > sec->size) |
| 1081 | return FALSE; |
| 1082 | |
| 1083 | call = contents + offset + 4; |
| 1084 | if (call[0] != 0x66 |
| 1085 | || !((call[1] == 0x48 |
| 1086 | && call[2] == 0xff |
| 1087 | && call[3] == 0x15) |
| 1088 | || (call[1] == 0x48 |
| 1089 | && call[2] == 0x67 |
| 1090 | && call[3] == 0xe8) |
| 1091 | || (call[1] == 0x66 |
| 1092 | && call[2] == 0x48 |
| 1093 | && call[3] == 0xe8))) |
| 1094 | { |
| 1095 | if (!ABI_64_P (abfd) |
| 1096 | || (offset + 19) > sec->size |
| 1097 | || offset < 3 |
| 1098 | || memcmp (call - 7, leaq + 1, 3) != 0 |
| 1099 | || memcmp (call, "\x48\xb8", 2) != 0 |
| 1100 | || call[11] != 0x01 |
| 1101 | || call[13] != 0xff |
| 1102 | || call[14] != 0xd0 |
| 1103 | || !((call[10] == 0x48 && call[12] == 0xd8) |
| 1104 | || (call[10] == 0x4c && call[12] == 0xf8))) |
| 1105 | return FALSE; |
| 1106 | largepic = TRUE; |
| 1107 | } |
| 1108 | else if (ABI_64_P (abfd)) |
| 1109 | { |
| 1110 | if (offset < 4 |
| 1111 | || memcmp (contents + offset - 4, leaq, 4) != 0) |
| 1112 | return FALSE; |
| 1113 | } |
| 1114 | else |
| 1115 | { |
| 1116 | if (offset < 3 |
| 1117 | || memcmp (contents + offset - 3, leaq + 1, 3) != 0) |
| 1118 | return FALSE; |
| 1119 | } |
| 1120 | indirect_call = call[2] == 0xff; |
| 1121 | } |
| 1122 | else |
| 1123 | { |
| 1124 | /* Check transition from LD access model. Only |
| 1125 | leaq foo@tlsld(%rip), %rdi; |
| 1126 | call __tls_get_addr@PLT |
| 1127 | or |
| 1128 | leaq foo@tlsld(%rip), %rdi; |
| 1129 | call *__tls_get_addr@GOTPCREL(%rip) |
| 1130 | which may be converted to |
| 1131 | addr32 call __tls_get_addr |
| 1132 | can transit to different access model. For largepic |
| 1133 | we also support: |
| 1134 | leaq foo@tlsld(%rip), %rdi |
| 1135 | movabsq $__tls_get_addr@pltoff, %rax |
| 1136 | addq $r15, %rax |
| 1137 | call *%rax |
| 1138 | or |
| 1139 | leaq foo@tlsld(%rip), %rdi |
| 1140 | movabsq $__tls_get_addr@pltoff, %rax |
| 1141 | addq $rbx, %rax |
| 1142 | call *%rax */ |
| 1143 | |
| 1144 | static const unsigned char lea[] = { 0x48, 0x8d, 0x3d }; |
| 1145 | |
| 1146 | if (offset < 3 || (offset + 9) > sec->size) |
| 1147 | return FALSE; |
| 1148 | |
| 1149 | if (memcmp (contents + offset - 3, lea, 3) != 0) |
| 1150 | return FALSE; |
| 1151 | |
| 1152 | call = contents + offset + 4; |
| 1153 | if (!(call[0] == 0xe8 |
| 1154 | || (call[0] == 0xff && call[1] == 0x15) |
| 1155 | || (call[0] == 0x67 && call[1] == 0xe8))) |
| 1156 | { |
| 1157 | if (!ABI_64_P (abfd) |
| 1158 | || (offset + 19) > sec->size |
| 1159 | || memcmp (call, "\x48\xb8", 2) != 0 |
| 1160 | || call[11] != 0x01 |
| 1161 | || call[13] != 0xff |
| 1162 | || call[14] != 0xd0 |
| 1163 | || !((call[10] == 0x48 && call[12] == 0xd8) |
| 1164 | || (call[10] == 0x4c && call[12] == 0xf8))) |
| 1165 | return FALSE; |
| 1166 | largepic = TRUE; |
| 1167 | } |
| 1168 | indirect_call = call[0] == 0xff; |
| 1169 | } |
| 1170 | |
| 1171 | r_symndx = htab->r_sym (rel[1].r_info); |
| 1172 | if (r_symndx < symtab_hdr->sh_info) |
| 1173 | return FALSE; |
| 1174 | |
| 1175 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1176 | if (h == NULL |
| 1177 | || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr) |
| 1178 | return FALSE; |
| 1179 | else |
| 1180 | { |
| 1181 | r_type = (ELF32_R_TYPE (rel[1].r_info) |
| 1182 | & ~R_X86_64_converted_reloc_bit); |
| 1183 | if (largepic) |
| 1184 | return r_type == R_X86_64_PLTOFF64; |
| 1185 | else if (indirect_call) |
| 1186 | return r_type == R_X86_64_GOTPCRELX; |
| 1187 | else |
| 1188 | return (r_type == R_X86_64_PC32 || r_type == R_X86_64_PLT32); |
| 1189 | } |
| 1190 | |
| 1191 | case R_X86_64_GOTTPOFF: |
| 1192 | /* Check transition from IE access model: |
| 1193 | mov foo@gottpoff(%rip), %reg |
| 1194 | add foo@gottpoff(%rip), %reg |
| 1195 | */ |
| 1196 | |
| 1197 | /* Check REX prefix first. */ |
| 1198 | if (offset >= 3 && (offset + 4) <= sec->size) |
| 1199 | { |
| 1200 | val = bfd_get_8 (abfd, contents + offset - 3); |
| 1201 | if (val != 0x48 && val != 0x4c) |
| 1202 | { |
| 1203 | /* X32 may have 0x44 REX prefix or no REX prefix. */ |
| 1204 | if (ABI_64_P (abfd)) |
| 1205 | return FALSE; |
| 1206 | } |
| 1207 | } |
| 1208 | else |
| 1209 | { |
| 1210 | /* X32 may not have any REX prefix. */ |
| 1211 | if (ABI_64_P (abfd)) |
| 1212 | return FALSE; |
| 1213 | if (offset < 2 || (offset + 3) > sec->size) |
| 1214 | return FALSE; |
| 1215 | } |
| 1216 | |
| 1217 | val = bfd_get_8 (abfd, contents + offset - 2); |
| 1218 | if (val != 0x8b && val != 0x03) |
| 1219 | return FALSE; |
| 1220 | |
| 1221 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1222 | return (val & 0xc7) == 5; |
| 1223 | |
| 1224 | case R_X86_64_GOTPC32_TLSDESC: |
| 1225 | /* Check transition from GDesc access model: |
| 1226 | leaq x@tlsdesc(%rip), %rax |
| 1227 | |
| 1228 | Make sure it's a leaq adding rip to a 32-bit offset |
| 1229 | into any register, although it's probably almost always |
| 1230 | going to be rax. */ |
| 1231 | |
| 1232 | if (offset < 3 || (offset + 4) > sec->size) |
| 1233 | return FALSE; |
| 1234 | |
| 1235 | val = bfd_get_8 (abfd, contents + offset - 3); |
| 1236 | if ((val & 0xfb) != 0x48) |
| 1237 | return FALSE; |
| 1238 | |
| 1239 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) |
| 1240 | return FALSE; |
| 1241 | |
| 1242 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1243 | return (val & 0xc7) == 0x05; |
| 1244 | |
| 1245 | case R_X86_64_TLSDESC_CALL: |
| 1246 | /* Check transition from GDesc access model: |
| 1247 | call *x@tlsdesc(%rax) |
| 1248 | */ |
| 1249 | if (offset + 2 <= sec->size) |
| 1250 | { |
| 1251 | /* Make sure that it's a call *x@tlsdesc(%rax). */ |
| 1252 | call = contents + offset; |
| 1253 | return call[0] == 0xff && call[1] == 0x10; |
| 1254 | } |
| 1255 | |
| 1256 | return FALSE; |
| 1257 | |
| 1258 | default: |
| 1259 | abort (); |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | /* Return TRUE if the TLS access transition is OK or no transition |
| 1264 | will be performed. Update R_TYPE if there is a transition. */ |
| 1265 | |
| 1266 | static bfd_boolean |
| 1267 | elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, |
| 1268 | asection *sec, bfd_byte *contents, |
| 1269 | Elf_Internal_Shdr *symtab_hdr, |
| 1270 | struct elf_link_hash_entry **sym_hashes, |
| 1271 | unsigned int *r_type, int tls_type, |
| 1272 | const Elf_Internal_Rela *rel, |
| 1273 | const Elf_Internal_Rela *relend, |
| 1274 | struct elf_link_hash_entry *h, |
| 1275 | unsigned long r_symndx, |
| 1276 | bfd_boolean from_relocate_section) |
| 1277 | { |
| 1278 | unsigned int from_type = *r_type; |
| 1279 | unsigned int to_type = from_type; |
| 1280 | bfd_boolean check = TRUE; |
| 1281 | |
| 1282 | /* Skip TLS transition for functions. */ |
| 1283 | if (h != NULL |
| 1284 | && (h->type == STT_FUNC |
| 1285 | || h->type == STT_GNU_IFUNC)) |
| 1286 | return TRUE; |
| 1287 | |
| 1288 | switch (from_type) |
| 1289 | { |
| 1290 | case R_X86_64_TLSGD: |
| 1291 | case R_X86_64_GOTPC32_TLSDESC: |
| 1292 | case R_X86_64_TLSDESC_CALL: |
| 1293 | case R_X86_64_GOTTPOFF: |
| 1294 | if (bfd_link_executable (info)) |
| 1295 | { |
| 1296 | if (h == NULL) |
| 1297 | to_type = R_X86_64_TPOFF32; |
| 1298 | else |
| 1299 | to_type = R_X86_64_GOTTPOFF; |
| 1300 | } |
| 1301 | |
| 1302 | /* When we are called from elf_x86_64_relocate_section, there may |
| 1303 | be additional transitions based on TLS_TYPE. */ |
| 1304 | if (from_relocate_section) |
| 1305 | { |
| 1306 | unsigned int new_to_type = to_type; |
| 1307 | |
| 1308 | if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type)) |
| 1309 | new_to_type = R_X86_64_TPOFF32; |
| 1310 | |
| 1311 | if (to_type == R_X86_64_TLSGD |
| 1312 | || to_type == R_X86_64_GOTPC32_TLSDESC |
| 1313 | || to_type == R_X86_64_TLSDESC_CALL) |
| 1314 | { |
| 1315 | if (tls_type == GOT_TLS_IE) |
| 1316 | new_to_type = R_X86_64_GOTTPOFF; |
| 1317 | } |
| 1318 | |
| 1319 | /* We checked the transition before when we were called from |
| 1320 | elf_x86_64_check_relocs. We only want to check the new |
| 1321 | transition which hasn't been checked before. */ |
| 1322 | check = new_to_type != to_type && from_type == to_type; |
| 1323 | to_type = new_to_type; |
| 1324 | } |
| 1325 | |
| 1326 | break; |
| 1327 | |
| 1328 | case R_X86_64_TLSLD: |
| 1329 | if (bfd_link_executable (info)) |
| 1330 | to_type = R_X86_64_TPOFF32; |
| 1331 | break; |
| 1332 | |
| 1333 | default: |
| 1334 | return TRUE; |
| 1335 | } |
| 1336 | |
| 1337 | /* Return TRUE if there is no transition. */ |
| 1338 | if (from_type == to_type) |
| 1339 | return TRUE; |
| 1340 | |
| 1341 | /* Check if the transition can be performed. */ |
| 1342 | if (check |
| 1343 | && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents, |
| 1344 | symtab_hdr, sym_hashes, |
| 1345 | from_type, rel, relend)) |
| 1346 | { |
| 1347 | reloc_howto_type *from, *to; |
| 1348 | const char *name; |
| 1349 | |
| 1350 | from = elf_x86_64_rtype_to_howto (abfd, from_type); |
| 1351 | to = elf_x86_64_rtype_to_howto (abfd, to_type); |
| 1352 | |
| 1353 | if (from == NULL || to == NULL) |
| 1354 | return FALSE; |
| 1355 | |
| 1356 | if (h) |
| 1357 | name = h->root.root.string; |
| 1358 | else |
| 1359 | { |
| 1360 | struct elf_x86_link_hash_table *htab; |
| 1361 | |
| 1362 | htab = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 1363 | if (htab == NULL) |
| 1364 | name = "*unknown*"; |
| 1365 | else |
| 1366 | { |
| 1367 | Elf_Internal_Sym *isym; |
| 1368 | |
| 1369 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1370 | abfd, r_symndx); |
| 1371 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1372 | } |
| 1373 | } |
| 1374 | |
| 1375 | _bfd_error_handler |
| 1376 | /* xgettext:c-format */ |
| 1377 | (_("%pB: TLS transition from %s to %s against `%s' at %#" PRIx64 |
| 1378 | " in section `%pA' failed"), |
| 1379 | abfd, from->name, to->name, name, (uint64_t) rel->r_offset, sec); |
| 1380 | bfd_set_error (bfd_error_bad_value); |
| 1381 | return FALSE; |
| 1382 | } |
| 1383 | |
| 1384 | *r_type = to_type; |
| 1385 | return TRUE; |
| 1386 | } |
| 1387 | |
| 1388 | /* Rename some of the generic section flags to better document how they |
| 1389 | are used here. */ |
| 1390 | #define check_relocs_failed sec_flg0 |
| 1391 | |
| 1392 | static bfd_boolean |
| 1393 | elf_x86_64_need_pic (struct bfd_link_info *info, |
| 1394 | bfd *input_bfd, asection *sec, |
| 1395 | struct elf_link_hash_entry *h, |
| 1396 | Elf_Internal_Shdr *symtab_hdr, |
| 1397 | Elf_Internal_Sym *isym, |
| 1398 | reloc_howto_type *howto) |
| 1399 | { |
| 1400 | const char *v = ""; |
| 1401 | const char *und = ""; |
| 1402 | const char *pic = ""; |
| 1403 | const char *object; |
| 1404 | |
| 1405 | const char *name; |
| 1406 | if (h) |
| 1407 | { |
| 1408 | name = h->root.root.string; |
| 1409 | switch (ELF_ST_VISIBILITY (h->other)) |
| 1410 | { |
| 1411 | case STV_HIDDEN: |
| 1412 | v = _("hidden symbol "); |
| 1413 | break; |
| 1414 | case STV_INTERNAL: |
| 1415 | v = _("internal symbol "); |
| 1416 | break; |
| 1417 | case STV_PROTECTED: |
| 1418 | v = _("protected symbol "); |
| 1419 | break; |
| 1420 | default: |
| 1421 | if (((struct elf_x86_link_hash_entry *) h)->def_protected) |
| 1422 | v = _("protected symbol "); |
| 1423 | else |
| 1424 | v = _("symbol "); |
| 1425 | pic = _("; recompile with -fPIC"); |
| 1426 | break; |
| 1427 | } |
| 1428 | |
| 1429 | if (!h->def_regular && !h->def_dynamic) |
| 1430 | und = _("undefined "); |
| 1431 | } |
| 1432 | else |
| 1433 | { |
| 1434 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL); |
| 1435 | pic = _("; recompile with -fPIC"); |
| 1436 | } |
| 1437 | |
| 1438 | if (bfd_link_dll (info)) |
| 1439 | object = _("a shared object"); |
| 1440 | else if (bfd_link_pie (info)) |
| 1441 | object = _("a PIE object"); |
| 1442 | else |
| 1443 | object = _("a PDE object"); |
| 1444 | |
| 1445 | /* xgettext:c-format */ |
| 1446 | _bfd_error_handler (_("%pB: relocation %s against %s%s`%s' can " |
| 1447 | "not be used when making %s%s"), |
| 1448 | input_bfd, howto->name, und, v, name, |
| 1449 | object, pic); |
| 1450 | bfd_set_error (bfd_error_bad_value); |
| 1451 | sec->check_relocs_failed = 1; |
| 1452 | return FALSE; |
| 1453 | } |
| 1454 | |
| 1455 | /* With the local symbol, foo, we convert |
| 1456 | mov foo@GOTPCREL(%rip), %reg |
| 1457 | to |
| 1458 | lea foo(%rip), %reg |
| 1459 | and convert |
| 1460 | call/jmp *foo@GOTPCREL(%rip) |
| 1461 | to |
| 1462 | nop call foo/jmp foo nop |
| 1463 | When PIC is false, convert |
| 1464 | test %reg, foo@GOTPCREL(%rip) |
| 1465 | to |
| 1466 | test $foo, %reg |
| 1467 | and convert |
| 1468 | binop foo@GOTPCREL(%rip), %reg |
| 1469 | to |
| 1470 | binop $foo, %reg |
| 1471 | where binop is one of adc, add, and, cmp, or, sbb, sub, xor |
| 1472 | instructions. */ |
| 1473 | |
| 1474 | static bfd_boolean |
| 1475 | elf_x86_64_convert_load_reloc (bfd *abfd, |
| 1476 | bfd_byte *contents, |
| 1477 | unsigned int *r_type_p, |
| 1478 | Elf_Internal_Rela *irel, |
| 1479 | struct elf_link_hash_entry *h, |
| 1480 | bfd_boolean *converted, |
| 1481 | struct bfd_link_info *link_info) |
| 1482 | { |
| 1483 | struct elf_x86_link_hash_table *htab; |
| 1484 | bfd_boolean is_pic; |
| 1485 | bfd_boolean no_overflow; |
| 1486 | bfd_boolean relocx; |
| 1487 | bfd_boolean to_reloc_pc32; |
| 1488 | asection *tsec; |
| 1489 | bfd_signed_vma raddend; |
| 1490 | unsigned int opcode; |
| 1491 | unsigned int modrm; |
| 1492 | unsigned int r_type = *r_type_p; |
| 1493 | unsigned int r_symndx; |
| 1494 | bfd_vma roff = irel->r_offset; |
| 1495 | |
| 1496 | if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2)) |
| 1497 | return TRUE; |
| 1498 | |
| 1499 | raddend = irel->r_addend; |
| 1500 | /* Addend for 32-bit PC-relative relocation must be -4. */ |
| 1501 | if (raddend != -4) |
| 1502 | return TRUE; |
| 1503 | |
| 1504 | htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA); |
| 1505 | is_pic = bfd_link_pic (link_info); |
| 1506 | |
| 1507 | relocx = (r_type == R_X86_64_GOTPCRELX |
| 1508 | || r_type == R_X86_64_REX_GOTPCRELX); |
| 1509 | |
| 1510 | /* TRUE if --no-relax is used. */ |
| 1511 | no_overflow = link_info->disable_target_specific_optimizations > 1; |
| 1512 | |
| 1513 | r_symndx = htab->r_sym (irel->r_info); |
| 1514 | |
| 1515 | opcode = bfd_get_8 (abfd, contents + roff - 2); |
| 1516 | |
| 1517 | /* Convert mov to lea since it has been done for a while. */ |
| 1518 | if (opcode != 0x8b) |
| 1519 | { |
| 1520 | /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX |
| 1521 | for call, jmp or one of adc, add, and, cmp, or, sbb, sub, |
| 1522 | test, xor instructions. */ |
| 1523 | if (!relocx) |
| 1524 | return TRUE; |
| 1525 | } |
| 1526 | |
| 1527 | /* We convert only to R_X86_64_PC32: |
| 1528 | 1. Branch. |
| 1529 | 2. R_X86_64_GOTPCREL since we can't modify REX byte. |
| 1530 | 3. no_overflow is true. |
| 1531 | 4. PIC. |
| 1532 | */ |
| 1533 | to_reloc_pc32 = (opcode == 0xff |
| 1534 | || !relocx |
| 1535 | || no_overflow |
| 1536 | || is_pic); |
| 1537 | |
| 1538 | /* Get the symbol referred to by the reloc. */ |
| 1539 | if (h == NULL) |
| 1540 | { |
| 1541 | Elf_Internal_Sym *isym |
| 1542 | = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx); |
| 1543 | |
| 1544 | /* Skip relocation against undefined symbols. */ |
| 1545 | if (isym->st_shndx == SHN_UNDEF) |
| 1546 | return TRUE; |
| 1547 | |
| 1548 | if (isym->st_shndx == SHN_ABS) |
| 1549 | tsec = bfd_abs_section_ptr; |
| 1550 | else if (isym->st_shndx == SHN_COMMON) |
| 1551 | tsec = bfd_com_section_ptr; |
| 1552 | else if (isym->st_shndx == SHN_X86_64_LCOMMON) |
| 1553 | tsec = &_bfd_elf_large_com_section; |
| 1554 | else |
| 1555 | tsec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1556 | } |
| 1557 | else |
| 1558 | { |
| 1559 | /* Undefined weak symbol is only bound locally in executable |
| 1560 | and its reference is resolved as 0 without relocation |
| 1561 | overflow. We can only perform this optimization for |
| 1562 | GOTPCRELX relocations since we need to modify REX byte. |
| 1563 | It is OK convert mov with R_X86_64_GOTPCREL to |
| 1564 | R_X86_64_PC32. */ |
| 1565 | bfd_boolean local_ref; |
| 1566 | struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h); |
| 1567 | |
| 1568 | /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */ |
| 1569 | local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h); |
| 1570 | if ((relocx || opcode == 0x8b) |
| 1571 | && (h->root.type == bfd_link_hash_undefweak |
| 1572 | && !eh->linker_def |
| 1573 | && local_ref)) |
| 1574 | { |
| 1575 | if (opcode == 0xff) |
| 1576 | { |
| 1577 | /* Skip for branch instructions since R_X86_64_PC32 |
| 1578 | may overflow. */ |
| 1579 | if (no_overflow) |
| 1580 | return TRUE; |
| 1581 | } |
| 1582 | else if (relocx) |
| 1583 | { |
| 1584 | /* For non-branch instructions, we can convert to |
| 1585 | R_X86_64_32/R_X86_64_32S since we know if there |
| 1586 | is a REX byte. */ |
| 1587 | to_reloc_pc32 = FALSE; |
| 1588 | } |
| 1589 | |
| 1590 | /* Since we don't know the current PC when PIC is true, |
| 1591 | we can't convert to R_X86_64_PC32. */ |
| 1592 | if (to_reloc_pc32 && is_pic) |
| 1593 | return TRUE; |
| 1594 | |
| 1595 | goto convert; |
| 1596 | } |
| 1597 | /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since |
| 1598 | ld.so may use its link-time address. */ |
| 1599 | else if (h->start_stop |
| 1600 | || eh->linker_def |
| 1601 | || ((h->def_regular |
| 1602 | || h->root.type == bfd_link_hash_defined |
| 1603 | || h->root.type == bfd_link_hash_defweak) |
| 1604 | && h != htab->elf.hdynamic |
| 1605 | && local_ref)) |
| 1606 | { |
| 1607 | /* bfd_link_hash_new or bfd_link_hash_undefined is |
| 1608 | set by an assignment in a linker script in |
| 1609 | bfd_elf_record_link_assignment. start_stop is set |
| 1610 | on __start_SECNAME/__stop_SECNAME which mark section |
| 1611 | SECNAME. */ |
| 1612 | if (h->start_stop |
| 1613 | || eh->linker_def |
| 1614 | || (h->def_regular |
| 1615 | && (h->root.type == bfd_link_hash_new |
| 1616 | || h->root.type == bfd_link_hash_undefined |
| 1617 | || ((h->root.type == bfd_link_hash_defined |
| 1618 | || h->root.type == bfd_link_hash_defweak) |
| 1619 | && h->root.u.def.section == bfd_und_section_ptr)))) |
| 1620 | { |
| 1621 | /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */ |
| 1622 | if (no_overflow) |
| 1623 | return TRUE; |
| 1624 | goto convert; |
| 1625 | } |
| 1626 | tsec = h->root.u.def.section; |
| 1627 | } |
| 1628 | else |
| 1629 | return TRUE; |
| 1630 | } |
| 1631 | |
| 1632 | /* Don't convert GOTPCREL relocation against large section. */ |
| 1633 | if (elf_section_data (tsec) != NULL |
| 1634 | && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0) |
| 1635 | return TRUE; |
| 1636 | |
| 1637 | /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */ |
| 1638 | if (no_overflow) |
| 1639 | return TRUE; |
| 1640 | |
| 1641 | convert: |
| 1642 | if (opcode == 0xff) |
| 1643 | { |
| 1644 | /* We have "call/jmp *foo@GOTPCREL(%rip)". */ |
| 1645 | unsigned int nop; |
| 1646 | unsigned int disp; |
| 1647 | bfd_vma nop_offset; |
| 1648 | |
| 1649 | /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to |
| 1650 | R_X86_64_PC32. */ |
| 1651 | modrm = bfd_get_8 (abfd, contents + roff - 1); |
| 1652 | if (modrm == 0x25) |
| 1653 | { |
| 1654 | /* Convert to "jmp foo nop". */ |
| 1655 | modrm = 0xe9; |
| 1656 | nop = NOP_OPCODE; |
| 1657 | nop_offset = irel->r_offset + 3; |
| 1658 | disp = bfd_get_32 (abfd, contents + irel->r_offset); |
| 1659 | irel->r_offset -= 1; |
| 1660 | bfd_put_32 (abfd, disp, contents + irel->r_offset); |
| 1661 | } |
| 1662 | else |
| 1663 | { |
| 1664 | struct elf_x86_link_hash_entry *eh |
| 1665 | = (struct elf_x86_link_hash_entry *) h; |
| 1666 | |
| 1667 | /* Convert to "nop call foo". ADDR_PREFIX_OPCODE |
| 1668 | is a nop prefix. */ |
| 1669 | modrm = 0xe8; |
| 1670 | /* To support TLS optimization, always use addr32 prefix for |
| 1671 | "call *__tls_get_addr@GOTPCREL(%rip)". */ |
| 1672 | if (eh && eh->tls_get_addr) |
| 1673 | { |
| 1674 | nop = 0x67; |
| 1675 | nop_offset = irel->r_offset - 2; |
| 1676 | } |
| 1677 | else |
| 1678 | { |
| 1679 | nop = link_info->call_nop_byte; |
| 1680 | if (link_info->call_nop_as_suffix) |
| 1681 | { |
| 1682 | nop_offset = irel->r_offset + 3; |
| 1683 | disp = bfd_get_32 (abfd, contents + irel->r_offset); |
| 1684 | irel->r_offset -= 1; |
| 1685 | bfd_put_32 (abfd, disp, contents + irel->r_offset); |
| 1686 | } |
| 1687 | else |
| 1688 | nop_offset = irel->r_offset - 2; |
| 1689 | } |
| 1690 | } |
| 1691 | bfd_put_8 (abfd, nop, contents + nop_offset); |
| 1692 | bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); |
| 1693 | r_type = R_X86_64_PC32; |
| 1694 | } |
| 1695 | else |
| 1696 | { |
| 1697 | unsigned int rex; |
| 1698 | unsigned int rex_mask = REX_R; |
| 1699 | |
| 1700 | if (r_type == R_X86_64_REX_GOTPCRELX) |
| 1701 | rex = bfd_get_8 (abfd, contents + roff - 3); |
| 1702 | else |
| 1703 | rex = 0; |
| 1704 | |
| 1705 | if (opcode == 0x8b) |
| 1706 | { |
| 1707 | if (to_reloc_pc32) |
| 1708 | { |
| 1709 | /* Convert "mov foo@GOTPCREL(%rip), %reg" to |
| 1710 | "lea foo(%rip), %reg". */ |
| 1711 | opcode = 0x8d; |
| 1712 | r_type = R_X86_64_PC32; |
| 1713 | } |
| 1714 | else |
| 1715 | { |
| 1716 | /* Convert "mov foo@GOTPCREL(%rip), %reg" to |
| 1717 | "mov $foo, %reg". */ |
| 1718 | opcode = 0xc7; |
| 1719 | modrm = bfd_get_8 (abfd, contents + roff - 1); |
| 1720 | modrm = 0xc0 | (modrm & 0x38) >> 3; |
| 1721 | if ((rex & REX_W) != 0 |
| 1722 | && ABI_64_P (link_info->output_bfd)) |
| 1723 | { |
| 1724 | /* Keep the REX_W bit in REX byte for LP64. */ |
| 1725 | r_type = R_X86_64_32S; |
| 1726 | goto rewrite_modrm_rex; |
| 1727 | } |
| 1728 | else |
| 1729 | { |
| 1730 | /* If the REX_W bit in REX byte isn't needed, |
| 1731 | use R_X86_64_32 and clear the W bit to avoid |
| 1732 | sign-extend imm32 to imm64. */ |
| 1733 | r_type = R_X86_64_32; |
| 1734 | /* Clear the W bit in REX byte. */ |
| 1735 | rex_mask |= REX_W; |
| 1736 | goto rewrite_modrm_rex; |
| 1737 | } |
| 1738 | } |
| 1739 | } |
| 1740 | else |
| 1741 | { |
| 1742 | /* R_X86_64_PC32 isn't supported. */ |
| 1743 | if (to_reloc_pc32) |
| 1744 | return TRUE; |
| 1745 | |
| 1746 | modrm = bfd_get_8 (abfd, contents + roff - 1); |
| 1747 | if (opcode == 0x85) |
| 1748 | { |
| 1749 | /* Convert "test %reg, foo@GOTPCREL(%rip)" to |
| 1750 | "test $foo, %reg". */ |
| 1751 | modrm = 0xc0 | (modrm & 0x38) >> 3; |
| 1752 | opcode = 0xf7; |
| 1753 | } |
| 1754 | else |
| 1755 | { |
| 1756 | /* Convert "binop foo@GOTPCREL(%rip), %reg" to |
| 1757 | "binop $foo, %reg". */ |
| 1758 | modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c); |
| 1759 | opcode = 0x81; |
| 1760 | } |
| 1761 | |
| 1762 | /* Use R_X86_64_32 with 32-bit operand to avoid relocation |
| 1763 | overflow when sign-extending imm32 to imm64. */ |
| 1764 | r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32; |
| 1765 | |
| 1766 | rewrite_modrm_rex: |
| 1767 | bfd_put_8 (abfd, modrm, contents + roff - 1); |
| 1768 | |
| 1769 | if (rex) |
| 1770 | { |
| 1771 | /* Move the R bit to the B bit in REX byte. */ |
| 1772 | rex = (rex & ~rex_mask) | (rex & REX_R) >> 2; |
| 1773 | bfd_put_8 (abfd, rex, contents + roff - 3); |
| 1774 | } |
| 1775 | |
| 1776 | /* No addend for R_X86_64_32/R_X86_64_32S relocations. */ |
| 1777 | irel->r_addend = 0; |
| 1778 | } |
| 1779 | |
| 1780 | bfd_put_8 (abfd, opcode, contents + roff - 2); |
| 1781 | } |
| 1782 | |
| 1783 | *r_type_p = r_type; |
| 1784 | irel->r_info = htab->r_info (r_symndx, |
| 1785 | r_type | R_X86_64_converted_reloc_bit); |
| 1786 | |
| 1787 | *converted = TRUE; |
| 1788 | |
| 1789 | return TRUE; |
| 1790 | } |
| 1791 | |
| 1792 | /* Look through the relocs for a section during the first phase, and |
| 1793 | calculate needed space in the global offset table, procedure |
| 1794 | linkage table, and dynamic reloc sections. */ |
| 1795 | |
| 1796 | static bfd_boolean |
| 1797 | elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, |
| 1798 | asection *sec, |
| 1799 | const Elf_Internal_Rela *relocs) |
| 1800 | { |
| 1801 | struct elf_x86_link_hash_table *htab; |
| 1802 | Elf_Internal_Shdr *symtab_hdr; |
| 1803 | struct elf_link_hash_entry **sym_hashes; |
| 1804 | const Elf_Internal_Rela *rel; |
| 1805 | const Elf_Internal_Rela *rel_end; |
| 1806 | asection *sreloc; |
| 1807 | bfd_byte *contents; |
| 1808 | bfd_boolean converted; |
| 1809 | |
| 1810 | if (bfd_link_relocatable (info)) |
| 1811 | return TRUE; |
| 1812 | |
| 1813 | /* Don't do anything special with non-loaded, non-alloced sections. |
| 1814 | In particular, any relocs in such sections should not affect GOT |
| 1815 | and PLT reference counting (ie. we don't allow them to create GOT |
| 1816 | or PLT entries), there's no possibility or desire to optimize TLS |
| 1817 | relocs, and there's not much point in propagating relocs to shared |
| 1818 | libs that the dynamic linker won't relocate. */ |
| 1819 | if ((sec->flags & SEC_ALLOC) == 0) |
| 1820 | return TRUE; |
| 1821 | |
| 1822 | htab = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 1823 | if (htab == NULL) |
| 1824 | { |
| 1825 | sec->check_relocs_failed = 1; |
| 1826 | return FALSE; |
| 1827 | } |
| 1828 | |
| 1829 | BFD_ASSERT (is_x86_elf (abfd, htab)); |
| 1830 | |
| 1831 | /* Get the section contents. */ |
| 1832 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1833 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1834 | else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1835 | { |
| 1836 | sec->check_relocs_failed = 1; |
| 1837 | return FALSE; |
| 1838 | } |
| 1839 | |
| 1840 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1841 | sym_hashes = elf_sym_hashes (abfd); |
| 1842 | |
| 1843 | converted = FALSE; |
| 1844 | |
| 1845 | sreloc = NULL; |
| 1846 | |
| 1847 | rel_end = relocs + sec->reloc_count; |
| 1848 | for (rel = relocs; rel < rel_end; rel++) |
| 1849 | { |
| 1850 | unsigned int r_type; |
| 1851 | unsigned int r_symndx; |
| 1852 | struct elf_link_hash_entry *h; |
| 1853 | struct elf_x86_link_hash_entry *eh; |
| 1854 | Elf_Internal_Sym *isym; |
| 1855 | const char *name; |
| 1856 | bfd_boolean size_reloc; |
| 1857 | bfd_boolean converted_reloc; |
| 1858 | |
| 1859 | r_symndx = htab->r_sym (rel->r_info); |
| 1860 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1861 | |
| 1862 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 1863 | { |
| 1864 | /* xgettext:c-format */ |
| 1865 | _bfd_error_handler (_("%pB: bad symbol index: %d"), |
| 1866 | abfd, r_symndx); |
| 1867 | goto error_return; |
| 1868 | } |
| 1869 | |
| 1870 | if (r_symndx < symtab_hdr->sh_info) |
| 1871 | { |
| 1872 | /* A local symbol. */ |
| 1873 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1874 | abfd, r_symndx); |
| 1875 | if (isym == NULL) |
| 1876 | goto error_return; |
| 1877 | |
| 1878 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 1879 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 1880 | { |
| 1881 | h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, |
| 1882 | TRUE); |
| 1883 | if (h == NULL) |
| 1884 | goto error_return; |
| 1885 | |
| 1886 | /* Fake a STT_GNU_IFUNC symbol. */ |
| 1887 | h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, |
| 1888 | isym, NULL); |
| 1889 | h->type = STT_GNU_IFUNC; |
| 1890 | h->def_regular = 1; |
| 1891 | h->ref_regular = 1; |
| 1892 | h->forced_local = 1; |
| 1893 | h->root.type = bfd_link_hash_defined; |
| 1894 | } |
| 1895 | else |
| 1896 | h = NULL; |
| 1897 | } |
| 1898 | else |
| 1899 | { |
| 1900 | isym = NULL; |
| 1901 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1902 | while (h->root.type == bfd_link_hash_indirect |
| 1903 | || h->root.type == bfd_link_hash_warning) |
| 1904 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1905 | } |
| 1906 | |
| 1907 | /* Check invalid x32 relocations. */ |
| 1908 | if (!ABI_64_P (abfd)) |
| 1909 | switch (r_type) |
| 1910 | { |
| 1911 | default: |
| 1912 | break; |
| 1913 | |
| 1914 | case R_X86_64_DTPOFF64: |
| 1915 | case R_X86_64_TPOFF64: |
| 1916 | case R_X86_64_PC64: |
| 1917 | case R_X86_64_GOTOFF64: |
| 1918 | case R_X86_64_GOT64: |
| 1919 | case R_X86_64_GOTPCREL64: |
| 1920 | case R_X86_64_GOTPC64: |
| 1921 | case R_X86_64_GOTPLT64: |
| 1922 | case R_X86_64_PLTOFF64: |
| 1923 | { |
| 1924 | if (h) |
| 1925 | name = h->root.root.string; |
| 1926 | else |
| 1927 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1928 | NULL); |
| 1929 | _bfd_error_handler |
| 1930 | /* xgettext:c-format */ |
| 1931 | (_("%pB: relocation %s against symbol `%s' isn't " |
| 1932 | "supported in x32 mode"), abfd, |
| 1933 | x86_64_elf_howto_table[r_type].name, name); |
| 1934 | bfd_set_error (bfd_error_bad_value); |
| 1935 | goto error_return; |
| 1936 | } |
| 1937 | break; |
| 1938 | } |
| 1939 | |
| 1940 | if (h != NULL) |
| 1941 | { |
| 1942 | /* It is referenced by a non-shared object. */ |
| 1943 | h->ref_regular = 1; |
| 1944 | |
| 1945 | if (h->type == STT_GNU_IFUNC) |
| 1946 | elf_tdata (info->output_bfd)->has_gnu_symbols |
| 1947 | |= elf_gnu_symbol_ifunc; |
| 1948 | } |
| 1949 | |
| 1950 | converted_reloc = FALSE; |
| 1951 | if ((r_type == R_X86_64_GOTPCREL |
| 1952 | || r_type == R_X86_64_GOTPCRELX |
| 1953 | || r_type == R_X86_64_REX_GOTPCRELX) |
| 1954 | && (h == NULL || h->type != STT_GNU_IFUNC)) |
| 1955 | { |
| 1956 | Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel; |
| 1957 | if (!elf_x86_64_convert_load_reloc (abfd, contents, &r_type, |
| 1958 | irel, h, &converted_reloc, |
| 1959 | info)) |
| 1960 | goto error_return; |
| 1961 | |
| 1962 | if (converted_reloc) |
| 1963 | converted = TRUE; |
| 1964 | } |
| 1965 | |
| 1966 | if (! elf_x86_64_tls_transition (info, abfd, sec, contents, |
| 1967 | symtab_hdr, sym_hashes, |
| 1968 | &r_type, GOT_UNKNOWN, |
| 1969 | rel, rel_end, h, r_symndx, FALSE)) |
| 1970 | goto error_return; |
| 1971 | |
| 1972 | /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ |
| 1973 | if (h == htab->elf.hgot) |
| 1974 | htab->got_referenced = TRUE; |
| 1975 | |
| 1976 | eh = (struct elf_x86_link_hash_entry *) h; |
| 1977 | switch (r_type) |
| 1978 | { |
| 1979 | case R_X86_64_TLSLD: |
| 1980 | htab->tls_ld_or_ldm_got.refcount = 1; |
| 1981 | goto create_got; |
| 1982 | |
| 1983 | case R_X86_64_TPOFF32: |
| 1984 | if (!bfd_link_executable (info) && ABI_64_P (abfd)) |
| 1985 | return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym, |
| 1986 | &x86_64_elf_howto_table[r_type]); |
| 1987 | if (eh != NULL) |
| 1988 | eh->zero_undefweak &= 0x2; |
| 1989 | break; |
| 1990 | |
| 1991 | case R_X86_64_GOTTPOFF: |
| 1992 | if (!bfd_link_executable (info)) |
| 1993 | info->flags |= DF_STATIC_TLS; |
| 1994 | /* Fall through */ |
| 1995 | |
| 1996 | case R_X86_64_GOT32: |
| 1997 | case R_X86_64_GOTPCREL: |
| 1998 | case R_X86_64_GOTPCRELX: |
| 1999 | case R_X86_64_REX_GOTPCRELX: |
| 2000 | case R_X86_64_TLSGD: |
| 2001 | case R_X86_64_GOT64: |
| 2002 | case R_X86_64_GOTPCREL64: |
| 2003 | case R_X86_64_GOTPLT64: |
| 2004 | case R_X86_64_GOTPC32_TLSDESC: |
| 2005 | case R_X86_64_TLSDESC_CALL: |
| 2006 | /* This symbol requires a global offset table entry. */ |
| 2007 | { |
| 2008 | int tls_type, old_tls_type; |
| 2009 | |
| 2010 | switch (r_type) |
| 2011 | { |
| 2012 | default: tls_type = GOT_NORMAL; break; |
| 2013 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; |
| 2014 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; |
| 2015 | case R_X86_64_GOTPC32_TLSDESC: |
| 2016 | case R_X86_64_TLSDESC_CALL: |
| 2017 | tls_type = GOT_TLS_GDESC; break; |
| 2018 | } |
| 2019 | |
| 2020 | if (h != NULL) |
| 2021 | { |
| 2022 | h->got.refcount = 1; |
| 2023 | old_tls_type = eh->tls_type; |
| 2024 | } |
| 2025 | else |
| 2026 | { |
| 2027 | bfd_signed_vma *local_got_refcounts; |
| 2028 | |
| 2029 | /* This is a global offset table entry for a local symbol. */ |
| 2030 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 2031 | if (local_got_refcounts == NULL) |
| 2032 | { |
| 2033 | bfd_size_type size; |
| 2034 | |
| 2035 | size = symtab_hdr->sh_info; |
| 2036 | size *= sizeof (bfd_signed_vma) |
| 2037 | + sizeof (bfd_vma) + sizeof (char); |
| 2038 | local_got_refcounts = ((bfd_signed_vma *) |
| 2039 | bfd_zalloc (abfd, size)); |
| 2040 | if (local_got_refcounts == NULL) |
| 2041 | goto error_return; |
| 2042 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 2043 | elf_x86_local_tlsdesc_gotent (abfd) |
| 2044 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 2045 | elf_x86_local_got_tls_type (abfd) |
| 2046 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 2047 | } |
| 2048 | local_got_refcounts[r_symndx] = 1; |
| 2049 | old_tls_type |
| 2050 | = elf_x86_local_got_tls_type (abfd) [r_symndx]; |
| 2051 | } |
| 2052 | |
| 2053 | /* If a TLS symbol is accessed using IE at least once, |
| 2054 | there is no point to use dynamic model for it. */ |
| 2055 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 2056 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 2057 | || tls_type != GOT_TLS_IE)) |
| 2058 | { |
| 2059 | if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) |
| 2060 | tls_type = old_tls_type; |
| 2061 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 2062 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 2063 | tls_type |= old_tls_type; |
| 2064 | else |
| 2065 | { |
| 2066 | if (h) |
| 2067 | name = h->root.root.string; |
| 2068 | else |
| 2069 | name = bfd_elf_sym_name (abfd, symtab_hdr, |
| 2070 | isym, NULL); |
| 2071 | _bfd_error_handler |
| 2072 | /* xgettext:c-format */ |
| 2073 | (_("%pB: '%s' accessed both as normal and" |
| 2074 | " thread local symbol"), |
| 2075 | abfd, name); |
| 2076 | bfd_set_error (bfd_error_bad_value); |
| 2077 | goto error_return; |
| 2078 | } |
| 2079 | } |
| 2080 | |
| 2081 | if (old_tls_type != tls_type) |
| 2082 | { |
| 2083 | if (eh != NULL) |
| 2084 | eh->tls_type = tls_type; |
| 2085 | else |
| 2086 | elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 2087 | } |
| 2088 | } |
| 2089 | /* Fall through */ |
| 2090 | |
| 2091 | case R_X86_64_GOTOFF64: |
| 2092 | case R_X86_64_GOTPC32: |
| 2093 | case R_X86_64_GOTPC64: |
| 2094 | create_got: |
| 2095 | if (eh != NULL) |
| 2096 | eh->zero_undefweak &= 0x2; |
| 2097 | break; |
| 2098 | |
| 2099 | case R_X86_64_PLT32: |
| 2100 | case R_X86_64_PLT32_BND: |
| 2101 | /* This symbol requires a procedure linkage table entry. We |
| 2102 | actually build the entry in adjust_dynamic_symbol, |
| 2103 | because this might be a case of linking PIC code which is |
| 2104 | never referenced by a dynamic object, in which case we |
| 2105 | don't need to generate a procedure linkage table entry |
| 2106 | after all. */ |
| 2107 | |
| 2108 | /* If this is a local symbol, we resolve it directly without |
| 2109 | creating a procedure linkage table entry. */ |
| 2110 | if (h == NULL) |
| 2111 | continue; |
| 2112 | |
| 2113 | eh->zero_undefweak &= 0x2; |
| 2114 | h->needs_plt = 1; |
| 2115 | h->plt.refcount = 1; |
| 2116 | break; |
| 2117 | |
| 2118 | case R_X86_64_PLTOFF64: |
| 2119 | /* This tries to form the 'address' of a function relative |
| 2120 | to GOT. For global symbols we need a PLT entry. */ |
| 2121 | if (h != NULL) |
| 2122 | { |
| 2123 | h->needs_plt = 1; |
| 2124 | h->plt.refcount = 1; |
| 2125 | } |
| 2126 | goto create_got; |
| 2127 | |
| 2128 | case R_X86_64_SIZE32: |
| 2129 | case R_X86_64_SIZE64: |
| 2130 | size_reloc = TRUE; |
| 2131 | goto do_size; |
| 2132 | |
| 2133 | case R_X86_64_32: |
| 2134 | if (!ABI_64_P (abfd)) |
| 2135 | goto pointer; |
| 2136 | /* Fall through. */ |
| 2137 | case R_X86_64_8: |
| 2138 | case R_X86_64_16: |
| 2139 | case R_X86_64_32S: |
| 2140 | /* Check relocation overflow as these relocs may lead to |
| 2141 | run-time relocation overflow. Don't error out for |
| 2142 | sections we don't care about, such as debug sections or |
| 2143 | when relocation overflow check is disabled. */ |
| 2144 | if (!info->no_reloc_overflow_check |
| 2145 | && !converted_reloc |
| 2146 | && (bfd_link_pic (info) |
| 2147 | || (bfd_link_executable (info) |
| 2148 | && h != NULL |
| 2149 | && !h->def_regular |
| 2150 | && h->def_dynamic |
| 2151 | && (sec->flags & SEC_READONLY) == 0))) |
| 2152 | return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym, |
| 2153 | &x86_64_elf_howto_table[r_type]); |
| 2154 | /* Fall through. */ |
| 2155 | |
| 2156 | case R_X86_64_PC8: |
| 2157 | case R_X86_64_PC16: |
| 2158 | case R_X86_64_PC32: |
| 2159 | case R_X86_64_PC32_BND: |
| 2160 | case R_X86_64_PC64: |
| 2161 | case R_X86_64_64: |
| 2162 | pointer: |
| 2163 | if (eh != NULL && (sec->flags & SEC_CODE) != 0) |
| 2164 | eh->zero_undefweak |= 0x2; |
| 2165 | /* We are called after all symbols have been resolved. Only |
| 2166 | relocation against STT_GNU_IFUNC symbol must go through |
| 2167 | PLT. */ |
| 2168 | if (h != NULL |
| 2169 | && (bfd_link_executable (info) |
| 2170 | || h->type == STT_GNU_IFUNC)) |
| 2171 | { |
| 2172 | bfd_boolean func_pointer_ref = FALSE; |
| 2173 | |
| 2174 | if (r_type == R_X86_64_PC32) |
| 2175 | { |
| 2176 | /* Since something like ".long foo - ." may be used |
| 2177 | as pointer, make sure that PLT is used if foo is |
| 2178 | a function defined in a shared library. */ |
| 2179 | if ((sec->flags & SEC_CODE) == 0) |
| 2180 | { |
| 2181 | h->pointer_equality_needed = 1; |
| 2182 | if (bfd_link_pie (info) |
| 2183 | && h->type == STT_FUNC |
| 2184 | && !h->def_regular |
| 2185 | && h->def_dynamic) |
| 2186 | { |
| 2187 | h->needs_plt = 1; |
| 2188 | h->plt.refcount = 1; |
| 2189 | } |
| 2190 | } |
| 2191 | } |
| 2192 | else if (r_type != R_X86_64_PC32_BND |
| 2193 | && r_type != R_X86_64_PC64) |
| 2194 | { |
| 2195 | h->pointer_equality_needed = 1; |
| 2196 | /* At run-time, R_X86_64_64 can be resolved for both |
| 2197 | x86-64 and x32. But R_X86_64_32 and R_X86_64_32S |
| 2198 | can only be resolved for x32. */ |
| 2199 | if ((sec->flags & SEC_READONLY) == 0 |
| 2200 | && (r_type == R_X86_64_64 |
| 2201 | || (!ABI_64_P (abfd) |
| 2202 | && (r_type == R_X86_64_32 |
| 2203 | || r_type == R_X86_64_32S)))) |
| 2204 | func_pointer_ref = TRUE; |
| 2205 | } |
| 2206 | |
| 2207 | if (!func_pointer_ref) |
| 2208 | { |
| 2209 | /* If this reloc is in a read-only section, we might |
| 2210 | need a copy reloc. We can't check reliably at this |
| 2211 | stage whether the section is read-only, as input |
| 2212 | sections have not yet been mapped to output sections. |
| 2213 | Tentatively set the flag for now, and correct in |
| 2214 | adjust_dynamic_symbol. */ |
| 2215 | h->non_got_ref = 1; |
| 2216 | |
| 2217 | /* We may need a .plt entry if the symbol is a function |
| 2218 | defined in a shared lib or is a function referenced |
| 2219 | from the code or read-only section. */ |
| 2220 | if (!h->def_regular |
| 2221 | || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) |
| 2222 | h->plt.refcount = 1; |
| 2223 | } |
| 2224 | } |
| 2225 | |
| 2226 | size_reloc = FALSE; |
| 2227 | do_size: |
| 2228 | if (NEED_DYNAMIC_RELOCATION_P (info, TRUE, h, sec, r_type, |
| 2229 | htab->pointer_r_type)) |
| 2230 | { |
| 2231 | struct elf_dyn_relocs *p; |
| 2232 | struct elf_dyn_relocs **head; |
| 2233 | |
| 2234 | /* We must copy these reloc types into the output file. |
| 2235 | Create a reloc section in dynobj and make room for |
| 2236 | this reloc. */ |
| 2237 | if (sreloc == NULL) |
| 2238 | { |
| 2239 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 2240 | (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2, |
| 2241 | abfd, /*rela?*/ TRUE); |
| 2242 | |
| 2243 | if (sreloc == NULL) |
| 2244 | goto error_return; |
| 2245 | } |
| 2246 | |
| 2247 | /* If this is a global symbol, we count the number of |
| 2248 | relocations we need for this symbol. */ |
| 2249 | if (h != NULL) |
| 2250 | head = &eh->dyn_relocs; |
| 2251 | else |
| 2252 | { |
| 2253 | /* Track dynamic relocs needed for local syms too. |
| 2254 | We really need local syms available to do this |
| 2255 | easily. Oh well. */ |
| 2256 | asection *s; |
| 2257 | void **vpp; |
| 2258 | |
| 2259 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 2260 | abfd, r_symndx); |
| 2261 | if (isym == NULL) |
| 2262 | goto error_return; |
| 2263 | |
| 2264 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 2265 | if (s == NULL) |
| 2266 | s = sec; |
| 2267 | |
| 2268 | /* Beware of type punned pointers vs strict aliasing |
| 2269 | rules. */ |
| 2270 | vpp = &(elf_section_data (s)->local_dynrel); |
| 2271 | head = (struct elf_dyn_relocs **)vpp; |
| 2272 | } |
| 2273 | |
| 2274 | p = *head; |
| 2275 | if (p == NULL || p->sec != sec) |
| 2276 | { |
| 2277 | bfd_size_type amt = sizeof *p; |
| 2278 | |
| 2279 | p = ((struct elf_dyn_relocs *) |
| 2280 | bfd_alloc (htab->elf.dynobj, amt)); |
| 2281 | if (p == NULL) |
| 2282 | goto error_return; |
| 2283 | p->next = *head; |
| 2284 | *head = p; |
| 2285 | p->sec = sec; |
| 2286 | p->count = 0; |
| 2287 | p->pc_count = 0; |
| 2288 | } |
| 2289 | |
| 2290 | p->count += 1; |
| 2291 | /* Count size relocation as PC-relative relocation. */ |
| 2292 | if (X86_PCREL_TYPE_P (r_type) || size_reloc) |
| 2293 | p->pc_count += 1; |
| 2294 | } |
| 2295 | break; |
| 2296 | |
| 2297 | /* This relocation describes the C++ object vtable hierarchy. |
| 2298 | Reconstruct it for later use during GC. */ |
| 2299 | case R_X86_64_GNU_VTINHERIT: |
| 2300 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 2301 | goto error_return; |
| 2302 | break; |
| 2303 | |
| 2304 | /* This relocation describes which C++ vtable entries are actually |
| 2305 | used. Record for later use during GC. */ |
| 2306 | case R_X86_64_GNU_VTENTRY: |
| 2307 | BFD_ASSERT (h != NULL); |
| 2308 | if (h != NULL |
| 2309 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 2310 | goto error_return; |
| 2311 | break; |
| 2312 | |
| 2313 | default: |
| 2314 | break; |
| 2315 | } |
| 2316 | } |
| 2317 | |
| 2318 | if (elf_section_data (sec)->this_hdr.contents != contents) |
| 2319 | { |
| 2320 | if (!converted && !info->keep_memory) |
| 2321 | free (contents); |
| 2322 | else |
| 2323 | { |
| 2324 | /* Cache the section contents for elf_link_input_bfd if any |
| 2325 | load is converted or --no-keep-memory isn't used. */ |
| 2326 | elf_section_data (sec)->this_hdr.contents = contents; |
| 2327 | } |
| 2328 | } |
| 2329 | |
| 2330 | /* Cache relocations if any load is converted. */ |
| 2331 | if (elf_section_data (sec)->relocs != relocs && converted) |
| 2332 | elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; |
| 2333 | |
| 2334 | return TRUE; |
| 2335 | |
| 2336 | error_return: |
| 2337 | if (elf_section_data (sec)->this_hdr.contents != contents) |
| 2338 | free (contents); |
| 2339 | sec->check_relocs_failed = 1; |
| 2340 | return FALSE; |
| 2341 | } |
| 2342 | |
| 2343 | /* Return the relocation value for @tpoff relocation |
| 2344 | if STT_TLS virtual address is ADDRESS. */ |
| 2345 | |
| 2346 | static bfd_vma |
| 2347 | elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) |
| 2348 | { |
| 2349 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 2350 | const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); |
| 2351 | bfd_vma static_tls_size; |
| 2352 | |
| 2353 | /* If tls_segment is NULL, we should have signalled an error already. */ |
| 2354 | if (htab->tls_sec == NULL) |
| 2355 | return 0; |
| 2356 | |
| 2357 | /* Consider special static TLS alignment requirements. */ |
| 2358 | static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); |
| 2359 | return address - static_tls_size - htab->tls_sec->vma; |
| 2360 | } |
| 2361 | |
| 2362 | /* Relocate an x86_64 ELF section. */ |
| 2363 | |
| 2364 | static bfd_boolean |
| 2365 | elf_x86_64_relocate_section (bfd *output_bfd, |
| 2366 | struct bfd_link_info *info, |
| 2367 | bfd *input_bfd, |
| 2368 | asection *input_section, |
| 2369 | bfd_byte *contents, |
| 2370 | Elf_Internal_Rela *relocs, |
| 2371 | Elf_Internal_Sym *local_syms, |
| 2372 | asection **local_sections) |
| 2373 | { |
| 2374 | struct elf_x86_link_hash_table *htab; |
| 2375 | Elf_Internal_Shdr *symtab_hdr; |
| 2376 | struct elf_link_hash_entry **sym_hashes; |
| 2377 | bfd_vma *local_got_offsets; |
| 2378 | bfd_vma *local_tlsdesc_gotents; |
| 2379 | Elf_Internal_Rela *rel; |
| 2380 | Elf_Internal_Rela *wrel; |
| 2381 | Elf_Internal_Rela *relend; |
| 2382 | unsigned int plt_entry_size; |
| 2383 | |
| 2384 | /* Skip if check_relocs failed. */ |
| 2385 | if (input_section->check_relocs_failed) |
| 2386 | return FALSE; |
| 2387 | |
| 2388 | htab = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 2389 | if (htab == NULL) |
| 2390 | return FALSE; |
| 2391 | |
| 2392 | if (!is_x86_elf (input_bfd, htab)) |
| 2393 | { |
| 2394 | bfd_set_error (bfd_error_wrong_format); |
| 2395 | return FALSE; |
| 2396 | } |
| 2397 | |
| 2398 | plt_entry_size = htab->plt.plt_entry_size; |
| 2399 | symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 2400 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2401 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2402 | local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd); |
| 2403 | |
| 2404 | _bfd_x86_elf_set_tls_module_base (info); |
| 2405 | |
| 2406 | rel = wrel = relocs; |
| 2407 | relend = relocs + input_section->reloc_count; |
| 2408 | for (; rel < relend; wrel++, rel++) |
| 2409 | { |
| 2410 | unsigned int r_type, r_type_tls; |
| 2411 | reloc_howto_type *howto; |
| 2412 | unsigned long r_symndx; |
| 2413 | struct elf_link_hash_entry *h; |
| 2414 | struct elf_x86_link_hash_entry *eh; |
| 2415 | Elf_Internal_Sym *sym; |
| 2416 | asection *sec; |
| 2417 | bfd_vma off, offplt, plt_offset; |
| 2418 | bfd_vma relocation; |
| 2419 | bfd_boolean unresolved_reloc; |
| 2420 | bfd_reloc_status_type r; |
| 2421 | int tls_type; |
| 2422 | asection *base_got, *resolved_plt; |
| 2423 | bfd_vma st_size; |
| 2424 | bfd_boolean resolved_to_zero; |
| 2425 | bfd_boolean relative_reloc; |
| 2426 | bfd_boolean converted_reloc; |
| 2427 | bfd_boolean need_copy_reloc_in_pie; |
| 2428 | |
| 2429 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2430 | if (r_type == (int) R_X86_64_GNU_VTINHERIT |
| 2431 | || r_type == (int) R_X86_64_GNU_VTENTRY) |
| 2432 | { |
| 2433 | if (wrel != rel) |
| 2434 | *wrel = *rel; |
| 2435 | continue; |
| 2436 | } |
| 2437 | |
| 2438 | r_symndx = htab->r_sym (rel->r_info); |
| 2439 | converted_reloc = (r_type & R_X86_64_converted_reloc_bit) != 0; |
| 2440 | if (converted_reloc) |
| 2441 | { |
| 2442 | r_type &= ~R_X86_64_converted_reloc_bit; |
| 2443 | rel->r_info = htab->r_info (r_symndx, r_type); |
| 2444 | } |
| 2445 | |
| 2446 | if (r_type >= (int) R_X86_64_standard) |
| 2447 | return _bfd_unrecognized_reloc (input_bfd, input_section, r_type); |
| 2448 | |
| 2449 | if (r_type != (int) R_X86_64_32 |
| 2450 | || ABI_64_P (output_bfd)) |
| 2451 | howto = x86_64_elf_howto_table + r_type; |
| 2452 | else |
| 2453 | howto = (x86_64_elf_howto_table |
| 2454 | + ARRAY_SIZE (x86_64_elf_howto_table) - 1); |
| 2455 | h = NULL; |
| 2456 | sym = NULL; |
| 2457 | sec = NULL; |
| 2458 | unresolved_reloc = FALSE; |
| 2459 | if (r_symndx < symtab_hdr->sh_info) |
| 2460 | { |
| 2461 | sym = local_syms + r_symndx; |
| 2462 | sec = local_sections[r_symndx]; |
| 2463 | |
| 2464 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, |
| 2465 | &sec, rel); |
| 2466 | st_size = sym->st_size; |
| 2467 | |
| 2468 | /* Relocate against local STT_GNU_IFUNC symbol. */ |
| 2469 | if (!bfd_link_relocatable (info) |
| 2470 | && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) |
| 2471 | { |
| 2472 | h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, |
| 2473 | rel, FALSE); |
| 2474 | if (h == NULL) |
| 2475 | abort (); |
| 2476 | |
| 2477 | /* Set STT_GNU_IFUNC symbol value. */ |
| 2478 | h->root.u.def.value = sym->st_value; |
| 2479 | h->root.u.def.section = sec; |
| 2480 | } |
| 2481 | } |
| 2482 | else |
| 2483 | { |
| 2484 | bfd_boolean warned ATTRIBUTE_UNUSED; |
| 2485 | bfd_boolean ignored ATTRIBUTE_UNUSED; |
| 2486 | |
| 2487 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2488 | r_symndx, symtab_hdr, sym_hashes, |
| 2489 | h, sec, relocation, |
| 2490 | unresolved_reloc, warned, ignored); |
| 2491 | st_size = h->size; |
| 2492 | } |
| 2493 | |
| 2494 | if (sec != NULL && discarded_section (sec)) |
| 2495 | { |
| 2496 | _bfd_clear_contents (howto, input_bfd, input_section, |
| 2497 | contents, rel->r_offset); |
| 2498 | wrel->r_offset = rel->r_offset; |
| 2499 | wrel->r_info = 0; |
| 2500 | wrel->r_addend = 0; |
| 2501 | |
| 2502 | /* For ld -r, remove relocations in debug sections against |
| 2503 | sections defined in discarded sections. Not done for |
| 2504 | eh_frame editing code expects to be present. */ |
| 2505 | if (bfd_link_relocatable (info) |
| 2506 | && (input_section->flags & SEC_DEBUGGING)) |
| 2507 | wrel--; |
| 2508 | |
| 2509 | continue; |
| 2510 | } |
| 2511 | |
| 2512 | if (bfd_link_relocatable (info)) |
| 2513 | { |
| 2514 | if (wrel != rel) |
| 2515 | *wrel = *rel; |
| 2516 | continue; |
| 2517 | } |
| 2518 | |
| 2519 | if (rel->r_addend == 0 && !ABI_64_P (output_bfd)) |
| 2520 | { |
| 2521 | if (r_type == R_X86_64_64) |
| 2522 | { |
| 2523 | /* For x32, treat R_X86_64_64 like R_X86_64_32 and |
| 2524 | zero-extend it to 64bit if addend is zero. */ |
| 2525 | r_type = R_X86_64_32; |
| 2526 | memset (contents + rel->r_offset + 4, 0, 4); |
| 2527 | } |
| 2528 | else if (r_type == R_X86_64_SIZE64) |
| 2529 | { |
| 2530 | /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and |
| 2531 | zero-extend it to 64bit if addend is zero. */ |
| 2532 | r_type = R_X86_64_SIZE32; |
| 2533 | memset (contents + rel->r_offset + 4, 0, 4); |
| 2534 | } |
| 2535 | } |
| 2536 | |
| 2537 | eh = (struct elf_x86_link_hash_entry *) h; |
| 2538 | |
| 2539 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 2540 | it here if it is defined in a non-shared object. */ |
| 2541 | if (h != NULL |
| 2542 | && h->type == STT_GNU_IFUNC |
| 2543 | && h->def_regular) |
| 2544 | { |
| 2545 | bfd_vma plt_index; |
| 2546 | const char *name; |
| 2547 | |
| 2548 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2549 | { |
| 2550 | /* If this is a SHT_NOTE section without SHF_ALLOC, treat |
| 2551 | STT_GNU_IFUNC symbol as STT_FUNC. */ |
| 2552 | if (elf_section_type (input_section) == SHT_NOTE) |
| 2553 | goto skip_ifunc; |
| 2554 | /* Dynamic relocs are not propagated for SEC_DEBUGGING |
| 2555 | sections because such sections are not SEC_ALLOC and |
| 2556 | thus ld.so will not process them. */ |
| 2557 | if ((input_section->flags & SEC_DEBUGGING) != 0) |
| 2558 | continue; |
| 2559 | abort (); |
| 2560 | } |
| 2561 | |
| 2562 | switch (r_type) |
| 2563 | { |
| 2564 | default: |
| 2565 | break; |
| 2566 | |
| 2567 | case R_X86_64_GOTPCREL: |
| 2568 | case R_X86_64_GOTPCRELX: |
| 2569 | case R_X86_64_REX_GOTPCRELX: |
| 2570 | case R_X86_64_GOTPCREL64: |
| 2571 | base_got = htab->elf.sgot; |
| 2572 | off = h->got.offset; |
| 2573 | |
| 2574 | if (base_got == NULL) |
| 2575 | abort (); |
| 2576 | |
| 2577 | if (off == (bfd_vma) -1) |
| 2578 | { |
| 2579 | /* We can't use h->got.offset here to save state, or |
| 2580 | even just remember the offset, as finish_dynamic_symbol |
| 2581 | would use that as offset into .got. */ |
| 2582 | |
| 2583 | if (h->plt.offset == (bfd_vma) -1) |
| 2584 | abort (); |
| 2585 | |
| 2586 | if (htab->elf.splt != NULL) |
| 2587 | { |
| 2588 | plt_index = (h->plt.offset / plt_entry_size |
| 2589 | - htab->plt.has_plt0); |
| 2590 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 2591 | base_got = htab->elf.sgotplt; |
| 2592 | } |
| 2593 | else |
| 2594 | { |
| 2595 | plt_index = h->plt.offset / plt_entry_size; |
| 2596 | off = plt_index * GOT_ENTRY_SIZE; |
| 2597 | base_got = htab->elf.igotplt; |
| 2598 | } |
| 2599 | |
| 2600 | if (h->dynindx == -1 |
| 2601 | || h->forced_local |
| 2602 | || info->symbolic) |
| 2603 | { |
| 2604 | /* This references the local defitionion. We must |
| 2605 | initialize this entry in the global offset table. |
| 2606 | Since the offset must always be a multiple of 8, |
| 2607 | we use the least significant bit to record |
| 2608 | whether we have initialized it already. |
| 2609 | |
| 2610 | When doing a dynamic link, we create a .rela.got |
| 2611 | relocation entry to initialize the value. This |
| 2612 | is done in the finish_dynamic_symbol routine. */ |
| 2613 | if ((off & 1) != 0) |
| 2614 | off &= ~1; |
| 2615 | else |
| 2616 | { |
| 2617 | bfd_put_64 (output_bfd, relocation, |
| 2618 | base_got->contents + off); |
| 2619 | /* Note that this is harmless for the GOTPLT64 |
| 2620 | case, as -1 | 1 still is -1. */ |
| 2621 | h->got.offset |= 1; |
| 2622 | } |
| 2623 | } |
| 2624 | } |
| 2625 | |
| 2626 | relocation = (base_got->output_section->vma |
| 2627 | + base_got->output_offset + off); |
| 2628 | |
| 2629 | goto do_relocation; |
| 2630 | } |
| 2631 | |
| 2632 | if (h->plt.offset == (bfd_vma) -1) |
| 2633 | { |
| 2634 | /* Handle static pointers of STT_GNU_IFUNC symbols. */ |
| 2635 | if (r_type == htab->pointer_r_type |
| 2636 | && (input_section->flags & SEC_CODE) == 0) |
| 2637 | goto do_ifunc_pointer; |
| 2638 | goto bad_ifunc_reloc; |
| 2639 | } |
| 2640 | |
| 2641 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 2642 | if (htab->elf.splt != NULL) |
| 2643 | { |
| 2644 | if (htab->plt_second != NULL) |
| 2645 | { |
| 2646 | resolved_plt = htab->plt_second; |
| 2647 | plt_offset = eh->plt_second.offset; |
| 2648 | } |
| 2649 | else |
| 2650 | { |
| 2651 | resolved_plt = htab->elf.splt; |
| 2652 | plt_offset = h->plt.offset; |
| 2653 | } |
| 2654 | } |
| 2655 | else |
| 2656 | { |
| 2657 | resolved_plt = htab->elf.iplt; |
| 2658 | plt_offset = h->plt.offset; |
| 2659 | } |
| 2660 | |
| 2661 | relocation = (resolved_plt->output_section->vma |
| 2662 | + resolved_plt->output_offset + plt_offset); |
| 2663 | |
| 2664 | switch (r_type) |
| 2665 | { |
| 2666 | default: |
| 2667 | bad_ifunc_reloc: |
| 2668 | if (h->root.root.string) |
| 2669 | name = h->root.root.string; |
| 2670 | else |
| 2671 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, |
| 2672 | NULL); |
| 2673 | _bfd_error_handler |
| 2674 | /* xgettext:c-format */ |
| 2675 | (_("%pB: relocation %s against STT_GNU_IFUNC " |
| 2676 | "symbol `%s' isn't supported"), input_bfd, |
| 2677 | howto->name, name); |
| 2678 | bfd_set_error (bfd_error_bad_value); |
| 2679 | return FALSE; |
| 2680 | |
| 2681 | case R_X86_64_32S: |
| 2682 | if (bfd_link_pic (info)) |
| 2683 | abort (); |
| 2684 | goto do_relocation; |
| 2685 | |
| 2686 | case R_X86_64_32: |
| 2687 | if (ABI_64_P (output_bfd)) |
| 2688 | goto do_relocation; |
| 2689 | /* FALLTHROUGH */ |
| 2690 | case R_X86_64_64: |
| 2691 | do_ifunc_pointer: |
| 2692 | if (rel->r_addend != 0) |
| 2693 | { |
| 2694 | if (h->root.root.string) |
| 2695 | name = h->root.root.string; |
| 2696 | else |
| 2697 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, |
| 2698 | sym, NULL); |
| 2699 | _bfd_error_handler |
| 2700 | /* xgettext:c-format */ |
| 2701 | (_("%pB: relocation %s against STT_GNU_IFUNC " |
| 2702 | "symbol `%s' has non-zero addend: %" PRId64), |
| 2703 | input_bfd, howto->name, name, (int64_t) rel->r_addend); |
| 2704 | bfd_set_error (bfd_error_bad_value); |
| 2705 | return FALSE; |
| 2706 | } |
| 2707 | |
| 2708 | /* Generate dynamic relcoation only when there is a |
| 2709 | non-GOT reference in a shared object or there is no |
| 2710 | PLT. */ |
| 2711 | if ((bfd_link_pic (info) && h->non_got_ref) |
| 2712 | || h->plt.offset == (bfd_vma) -1) |
| 2713 | { |
| 2714 | Elf_Internal_Rela outrel; |
| 2715 | asection *sreloc; |
| 2716 | |
| 2717 | /* Need a dynamic relocation to get the real function |
| 2718 | address. */ |
| 2719 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, |
| 2720 | info, |
| 2721 | input_section, |
| 2722 | rel->r_offset); |
| 2723 | if (outrel.r_offset == (bfd_vma) -1 |
| 2724 | || outrel.r_offset == (bfd_vma) -2) |
| 2725 | abort (); |
| 2726 | |
| 2727 | outrel.r_offset += (input_section->output_section->vma |
| 2728 | + input_section->output_offset); |
| 2729 | |
| 2730 | if (POINTER_LOCAL_IFUNC_P (info, h)) |
| 2731 | { |
| 2732 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), |
| 2733 | h->root.root.string, |
| 2734 | h->root.u.def.section->owner); |
| 2735 | |
| 2736 | /* This symbol is resolved locally. */ |
| 2737 | outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE); |
| 2738 | outrel.r_addend = (h->root.u.def.value |
| 2739 | + h->root.u.def.section->output_section->vma |
| 2740 | + h->root.u.def.section->output_offset); |
| 2741 | } |
| 2742 | else |
| 2743 | { |
| 2744 | outrel.r_info = htab->r_info (h->dynindx, r_type); |
| 2745 | outrel.r_addend = 0; |
| 2746 | } |
| 2747 | |
| 2748 | /* Dynamic relocations are stored in |
| 2749 | 1. .rela.ifunc section in PIC object. |
| 2750 | 2. .rela.got section in dynamic executable. |
| 2751 | 3. .rela.iplt section in static executable. */ |
| 2752 | if (bfd_link_pic (info)) |
| 2753 | sreloc = htab->elf.irelifunc; |
| 2754 | else if (htab->elf.splt != NULL) |
| 2755 | sreloc = htab->elf.srelgot; |
| 2756 | else |
| 2757 | sreloc = htab->elf.irelplt; |
| 2758 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 2759 | |
| 2760 | /* If this reloc is against an external symbol, we |
| 2761 | do not want to fiddle with the addend. Otherwise, |
| 2762 | we need to include the symbol value so that it |
| 2763 | becomes an addend for the dynamic reloc. For an |
| 2764 | internal symbol, we have updated addend. */ |
| 2765 | continue; |
| 2766 | } |
| 2767 | /* FALLTHROUGH */ |
| 2768 | case R_X86_64_PC32: |
| 2769 | case R_X86_64_PC32_BND: |
| 2770 | case R_X86_64_PC64: |
| 2771 | case R_X86_64_PLT32: |
| 2772 | case R_X86_64_PLT32_BND: |
| 2773 | goto do_relocation; |
| 2774 | } |
| 2775 | } |
| 2776 | |
| 2777 | skip_ifunc: |
| 2778 | resolved_to_zero = (eh != NULL |
| 2779 | && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); |
| 2780 | |
| 2781 | /* When generating a shared object, the relocations handled here are |
| 2782 | copied into the output file to be resolved at run time. */ |
| 2783 | switch (r_type) |
| 2784 | { |
| 2785 | case R_X86_64_GOT32: |
| 2786 | case R_X86_64_GOT64: |
| 2787 | /* Relocation is to the entry for this symbol in the global |
| 2788 | offset table. */ |
| 2789 | case R_X86_64_GOTPCREL: |
| 2790 | case R_X86_64_GOTPCRELX: |
| 2791 | case R_X86_64_REX_GOTPCRELX: |
| 2792 | case R_X86_64_GOTPCREL64: |
| 2793 | /* Use global offset table entry as symbol value. */ |
| 2794 | case R_X86_64_GOTPLT64: |
| 2795 | /* This is obsolete and treated the same as GOT64. */ |
| 2796 | base_got = htab->elf.sgot; |
| 2797 | |
| 2798 | if (htab->elf.sgot == NULL) |
| 2799 | abort (); |
| 2800 | |
| 2801 | relative_reloc = FALSE; |
| 2802 | if (h != NULL) |
| 2803 | { |
| 2804 | off = h->got.offset; |
| 2805 | if (h->needs_plt |
| 2806 | && h->plt.offset != (bfd_vma)-1 |
| 2807 | && off == (bfd_vma)-1) |
| 2808 | { |
| 2809 | /* We can't use h->got.offset here to save |
| 2810 | state, or even just remember the offset, as |
| 2811 | finish_dynamic_symbol would use that as offset into |
| 2812 | .got. */ |
| 2813 | bfd_vma plt_index = (h->plt.offset / plt_entry_size |
| 2814 | - htab->plt.has_plt0); |
| 2815 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 2816 | base_got = htab->elf.sgotplt; |
| 2817 | } |
| 2818 | |
| 2819 | if (RESOLVED_LOCALLY_P (info, h, htab)) |
| 2820 | { |
| 2821 | /* We must initialize this entry in the global offset |
| 2822 | table. Since the offset must always be a multiple |
| 2823 | of 8, we use the least significant bit to record |
| 2824 | whether we have initialized it already. |
| 2825 | |
| 2826 | When doing a dynamic link, we create a .rela.got |
| 2827 | relocation entry to initialize the value. This is |
| 2828 | done in the finish_dynamic_symbol routine. */ |
| 2829 | if ((off & 1) != 0) |
| 2830 | off &= ~1; |
| 2831 | else |
| 2832 | { |
| 2833 | bfd_put_64 (output_bfd, relocation, |
| 2834 | base_got->contents + off); |
| 2835 | /* Note that this is harmless for the GOTPLT64 case, |
| 2836 | as -1 | 1 still is -1. */ |
| 2837 | h->got.offset |= 1; |
| 2838 | |
| 2839 | if (GENERATE_RELATIVE_RELOC_P (info, h)) |
| 2840 | { |
| 2841 | /* If this symbol isn't dynamic in PIC, |
| 2842 | generate R_X86_64_RELATIVE here. */ |
| 2843 | eh->no_finish_dynamic_symbol = 1; |
| 2844 | relative_reloc = TRUE; |
| 2845 | } |
| 2846 | } |
| 2847 | } |
| 2848 | else |
| 2849 | unresolved_reloc = FALSE; |
| 2850 | } |
| 2851 | else |
| 2852 | { |
| 2853 | if (local_got_offsets == NULL) |
| 2854 | abort (); |
| 2855 | |
| 2856 | off = local_got_offsets[r_symndx]; |
| 2857 | |
| 2858 | /* The offset must always be a multiple of 8. We use |
| 2859 | the least significant bit to record whether we have |
| 2860 | already generated the necessary reloc. */ |
| 2861 | if ((off & 1) != 0) |
| 2862 | off &= ~1; |
| 2863 | else |
| 2864 | { |
| 2865 | bfd_put_64 (output_bfd, relocation, |
| 2866 | base_got->contents + off); |
| 2867 | local_got_offsets[r_symndx] |= 1; |
| 2868 | |
| 2869 | if (bfd_link_pic (info)) |
| 2870 | relative_reloc = TRUE; |
| 2871 | } |
| 2872 | } |
| 2873 | |
| 2874 | if (relative_reloc) |
| 2875 | { |
| 2876 | asection *s; |
| 2877 | Elf_Internal_Rela outrel; |
| 2878 | |
| 2879 | /* We need to generate a R_X86_64_RELATIVE reloc |
| 2880 | for the dynamic linker. */ |
| 2881 | s = htab->elf.srelgot; |
| 2882 | if (s == NULL) |
| 2883 | abort (); |
| 2884 | |
| 2885 | outrel.r_offset = (base_got->output_section->vma |
| 2886 | + base_got->output_offset |
| 2887 | + off); |
| 2888 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 2889 | outrel.r_addend = relocation; |
| 2890 | elf_append_rela (output_bfd, s, &outrel); |
| 2891 | } |
| 2892 | |
| 2893 | if (off >= (bfd_vma) -2) |
| 2894 | abort (); |
| 2895 | |
| 2896 | relocation = base_got->output_section->vma |
| 2897 | + base_got->output_offset + off; |
| 2898 | if (r_type != R_X86_64_GOTPCREL |
| 2899 | && r_type != R_X86_64_GOTPCRELX |
| 2900 | && r_type != R_X86_64_REX_GOTPCRELX |
| 2901 | && r_type != R_X86_64_GOTPCREL64) |
| 2902 | relocation -= htab->elf.sgotplt->output_section->vma |
| 2903 | - htab->elf.sgotplt->output_offset; |
| 2904 | |
| 2905 | break; |
| 2906 | |
| 2907 | case R_X86_64_GOTOFF64: |
| 2908 | /* Relocation is relative to the start of the global offset |
| 2909 | table. */ |
| 2910 | |
| 2911 | /* Check to make sure it isn't a protected function or data |
| 2912 | symbol for shared library since it may not be local when |
| 2913 | used as function address or with copy relocation. We also |
| 2914 | need to make sure that a symbol is referenced locally. */ |
| 2915 | if (bfd_link_pic (info) && h) |
| 2916 | { |
| 2917 | if (!h->def_regular) |
| 2918 | { |
| 2919 | const char *v; |
| 2920 | |
| 2921 | switch (ELF_ST_VISIBILITY (h->other)) |
| 2922 | { |
| 2923 | case STV_HIDDEN: |
| 2924 | v = _("hidden symbol"); |
| 2925 | break; |
| 2926 | case STV_INTERNAL: |
| 2927 | v = _("internal symbol"); |
| 2928 | break; |
| 2929 | case STV_PROTECTED: |
| 2930 | v = _("protected symbol"); |
| 2931 | break; |
| 2932 | default: |
| 2933 | v = _("symbol"); |
| 2934 | break; |
| 2935 | } |
| 2936 | |
| 2937 | _bfd_error_handler |
| 2938 | /* xgettext:c-format */ |
| 2939 | (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s" |
| 2940 | " `%s' can not be used when making a shared object"), |
| 2941 | input_bfd, v, h->root.root.string); |
| 2942 | bfd_set_error (bfd_error_bad_value); |
| 2943 | return FALSE; |
| 2944 | } |
| 2945 | else if (!bfd_link_executable (info) |
| 2946 | && !SYMBOL_REFERENCES_LOCAL_P (info, h) |
| 2947 | && (h->type == STT_FUNC |
| 2948 | || h->type == STT_OBJECT) |
| 2949 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 2950 | { |
| 2951 | _bfd_error_handler |
| 2952 | /* xgettext:c-format */ |
| 2953 | (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s" |
| 2954 | " `%s' can not be used when making a shared object"), |
| 2955 | input_bfd, |
| 2956 | h->type == STT_FUNC ? "function" : "data", |
| 2957 | h->root.root.string); |
| 2958 | bfd_set_error (bfd_error_bad_value); |
| 2959 | return FALSE; |
| 2960 | } |
| 2961 | } |
| 2962 | |
| 2963 | /* Note that sgot is not involved in this |
| 2964 | calculation. We always want the start of .got.plt. If we |
| 2965 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 2966 | permitted by the ABI, we might have to change this |
| 2967 | calculation. */ |
| 2968 | relocation -= htab->elf.sgotplt->output_section->vma |
| 2969 | + htab->elf.sgotplt->output_offset; |
| 2970 | break; |
| 2971 | |
| 2972 | case R_X86_64_GOTPC32: |
| 2973 | case R_X86_64_GOTPC64: |
| 2974 | /* Use global offset table as symbol value. */ |
| 2975 | relocation = htab->elf.sgotplt->output_section->vma |
| 2976 | + htab->elf.sgotplt->output_offset; |
| 2977 | unresolved_reloc = FALSE; |
| 2978 | break; |
| 2979 | |
| 2980 | case R_X86_64_PLTOFF64: |
| 2981 | /* Relocation is PLT entry relative to GOT. For local |
| 2982 | symbols it's the symbol itself relative to GOT. */ |
| 2983 | if (h != NULL |
| 2984 | /* See PLT32 handling. */ |
| 2985 | && (h->plt.offset != (bfd_vma) -1 |
| 2986 | || eh->plt_got.offset != (bfd_vma) -1) |
| 2987 | && htab->elf.splt != NULL) |
| 2988 | { |
| 2989 | if (eh->plt_got.offset != (bfd_vma) -1) |
| 2990 | { |
| 2991 | /* Use the GOT PLT. */ |
| 2992 | resolved_plt = htab->plt_got; |
| 2993 | plt_offset = eh->plt_got.offset; |
| 2994 | } |
| 2995 | else if (htab->plt_second != NULL) |
| 2996 | { |
| 2997 | resolved_plt = htab->plt_second; |
| 2998 | plt_offset = eh->plt_second.offset; |
| 2999 | } |
| 3000 | else |
| 3001 | { |
| 3002 | resolved_plt = htab->elf.splt; |
| 3003 | plt_offset = h->plt.offset; |
| 3004 | } |
| 3005 | |
| 3006 | relocation = (resolved_plt->output_section->vma |
| 3007 | + resolved_plt->output_offset |
| 3008 | + plt_offset); |
| 3009 | unresolved_reloc = FALSE; |
| 3010 | } |
| 3011 | |
| 3012 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3013 | + htab->elf.sgotplt->output_offset; |
| 3014 | break; |
| 3015 | |
| 3016 | case R_X86_64_PLT32: |
| 3017 | case R_X86_64_PLT32_BND: |
| 3018 | /* Relocation is to the entry for this symbol in the |
| 3019 | procedure linkage table. */ |
| 3020 | |
| 3021 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 3022 | without using the procedure linkage table. */ |
| 3023 | if (h == NULL) |
| 3024 | break; |
| 3025 | |
| 3026 | if ((h->plt.offset == (bfd_vma) -1 |
| 3027 | && eh->plt_got.offset == (bfd_vma) -1) |
| 3028 | || htab->elf.splt == NULL) |
| 3029 | { |
| 3030 | /* We didn't make a PLT entry for this symbol. This |
| 3031 | happens when statically linking PIC code, or when |
| 3032 | using -Bsymbolic. */ |
| 3033 | break; |
| 3034 | } |
| 3035 | |
| 3036 | use_plt: |
| 3037 | if (h->plt.offset != (bfd_vma) -1) |
| 3038 | { |
| 3039 | if (htab->plt_second != NULL) |
| 3040 | { |
| 3041 | resolved_plt = htab->plt_second; |
| 3042 | plt_offset = eh->plt_second.offset; |
| 3043 | } |
| 3044 | else |
| 3045 | { |
| 3046 | resolved_plt = htab->elf.splt; |
| 3047 | plt_offset = h->plt.offset; |
| 3048 | } |
| 3049 | } |
| 3050 | else |
| 3051 | { |
| 3052 | /* Use the GOT PLT. */ |
| 3053 | resolved_plt = htab->plt_got; |
| 3054 | plt_offset = eh->plt_got.offset; |
| 3055 | } |
| 3056 | |
| 3057 | relocation = (resolved_plt->output_section->vma |
| 3058 | + resolved_plt->output_offset |
| 3059 | + plt_offset); |
| 3060 | unresolved_reloc = FALSE; |
| 3061 | break; |
| 3062 | |
| 3063 | case R_X86_64_SIZE32: |
| 3064 | case R_X86_64_SIZE64: |
| 3065 | /* Set to symbol size. */ |
| 3066 | relocation = st_size; |
| 3067 | goto direct; |
| 3068 | |
| 3069 | case R_X86_64_PC8: |
| 3070 | case R_X86_64_PC16: |
| 3071 | case R_X86_64_PC32: |
| 3072 | case R_X86_64_PC32_BND: |
| 3073 | /* Don't complain about -fPIC if the symbol is undefined when |
| 3074 | building executable unless it is unresolved weak symbol, |
| 3075 | references a dynamic definition in PIE or -z nocopyreloc |
| 3076 | is used. */ |
| 3077 | if ((input_section->flags & SEC_ALLOC) != 0 |
| 3078 | && (input_section->flags & SEC_READONLY) != 0 |
| 3079 | && h != NULL |
| 3080 | && ((bfd_link_executable (info) |
| 3081 | && ((h->root.type == bfd_link_hash_undefweak |
| 3082 | && !resolved_to_zero) |
| 3083 | || (bfd_link_pie (info) |
| 3084 | && !h->def_regular |
| 3085 | && h->def_dynamic) |
| 3086 | || ((info->nocopyreloc |
| 3087 | || (eh->def_protected |
| 3088 | && elf_has_no_copy_on_protected (h->root.u.def.section->owner))) |
| 3089 | && h->def_dynamic |
| 3090 | && !(h->root.u.def.section->flags & SEC_CODE)))) |
| 3091 | || bfd_link_dll (info))) |
| 3092 | { |
| 3093 | bfd_boolean fail = FALSE; |
| 3094 | if (SYMBOL_REFERENCES_LOCAL_P (info, h)) |
| 3095 | { |
| 3096 | /* Symbol is referenced locally. Make sure it is |
| 3097 | defined locally. */ |
| 3098 | fail = !(h->def_regular || ELF_COMMON_DEF_P (h)); |
| 3099 | } |
| 3100 | else if (!(bfd_link_pie (info) |
| 3101 | && (h->needs_copy || eh->needs_copy))) |
| 3102 | { |
| 3103 | /* Symbol doesn't need copy reloc and isn't referenced |
| 3104 | locally. Address of protected function may not be |
| 3105 | reachable at run-time. */ |
| 3106 | fail = (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 3107 | || (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED |
| 3108 | && h->type == STT_FUNC)); |
| 3109 | } |
| 3110 | |
| 3111 | if (fail) |
| 3112 | return elf_x86_64_need_pic (info, input_bfd, input_section, |
| 3113 | h, NULL, NULL, howto); |
| 3114 | } |
| 3115 | /* Since x86-64 has PC-relative PLT, we can use PLT in PIE |
| 3116 | as function address. */ |
| 3117 | else if (h != NULL |
| 3118 | && (input_section->flags & SEC_CODE) == 0 |
| 3119 | && bfd_link_pie (info) |
| 3120 | && h->type == STT_FUNC |
| 3121 | && !h->def_regular |
| 3122 | && h->def_dynamic) |
| 3123 | goto use_plt; |
| 3124 | /* Fall through. */ |
| 3125 | |
| 3126 | case R_X86_64_8: |
| 3127 | case R_X86_64_16: |
| 3128 | case R_X86_64_32: |
| 3129 | case R_X86_64_PC64: |
| 3130 | case R_X86_64_64: |
| 3131 | /* FIXME: The ABI says the linker should make sure the value is |
| 3132 | the same when it's zeroextended to 64 bit. */ |
| 3133 | |
| 3134 | direct: |
| 3135 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 3136 | break; |
| 3137 | |
| 3138 | need_copy_reloc_in_pie = (bfd_link_pie (info) |
| 3139 | && h != NULL |
| 3140 | && (h->needs_copy |
| 3141 | || eh->needs_copy |
| 3142 | || (h->root.type |
| 3143 | == bfd_link_hash_undefined)) |
| 3144 | && (X86_PCREL_TYPE_P (r_type) |
| 3145 | || X86_SIZE_TYPE_P (r_type))); |
| 3146 | |
| 3147 | if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, |
| 3148 | need_copy_reloc_in_pie, |
| 3149 | resolved_to_zero, FALSE)) |
| 3150 | { |
| 3151 | Elf_Internal_Rela outrel; |
| 3152 | bfd_boolean skip, relocate; |
| 3153 | asection *sreloc; |
| 3154 | |
| 3155 | /* When generating a shared object, these relocations |
| 3156 | are copied into the output file to be resolved at run |
| 3157 | time. */ |
| 3158 | skip = FALSE; |
| 3159 | relocate = FALSE; |
| 3160 | |
| 3161 | outrel.r_offset = |
| 3162 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 3163 | rel->r_offset); |
| 3164 | if (outrel.r_offset == (bfd_vma) -1) |
| 3165 | skip = TRUE; |
| 3166 | else if (outrel.r_offset == (bfd_vma) -2) |
| 3167 | skip = TRUE, relocate = TRUE; |
| 3168 | |
| 3169 | outrel.r_offset += (input_section->output_section->vma |
| 3170 | + input_section->output_offset); |
| 3171 | |
| 3172 | if (skip) |
| 3173 | memset (&outrel, 0, sizeof outrel); |
| 3174 | |
| 3175 | else if (COPY_INPUT_RELOC_P (info, h, r_type)) |
| 3176 | { |
| 3177 | outrel.r_info = htab->r_info (h->dynindx, r_type); |
| 3178 | outrel.r_addend = rel->r_addend; |
| 3179 | } |
| 3180 | else |
| 3181 | { |
| 3182 | /* This symbol is local, or marked to become local. |
| 3183 | When relocation overflow check is disabled, we |
| 3184 | convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */ |
| 3185 | if (r_type == htab->pointer_r_type |
| 3186 | || (r_type == R_X86_64_32 |
| 3187 | && info->no_reloc_overflow_check)) |
| 3188 | { |
| 3189 | relocate = TRUE; |
| 3190 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 3191 | outrel.r_addend = relocation + rel->r_addend; |
| 3192 | } |
| 3193 | else if (r_type == R_X86_64_64 |
| 3194 | && !ABI_64_P (output_bfd)) |
| 3195 | { |
| 3196 | relocate = TRUE; |
| 3197 | outrel.r_info = htab->r_info (0, |
| 3198 | R_X86_64_RELATIVE64); |
| 3199 | outrel.r_addend = relocation + rel->r_addend; |
| 3200 | /* Check addend overflow. */ |
| 3201 | if ((outrel.r_addend & 0x80000000) |
| 3202 | != (rel->r_addend & 0x80000000)) |
| 3203 | { |
| 3204 | const char *name; |
| 3205 | int addend = rel->r_addend; |
| 3206 | if (h && h->root.root.string) |
| 3207 | name = h->root.root.string; |
| 3208 | else |
| 3209 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, |
| 3210 | sym, NULL); |
| 3211 | _bfd_error_handler |
| 3212 | /* xgettext:c-format */ |
| 3213 | (_("%pB: addend %s%#x in relocation %s against " |
| 3214 | "symbol `%s' at %#" PRIx64 |
| 3215 | " in section `%pA' is out of range"), |
| 3216 | input_bfd, addend < 0 ? "-" : "", addend, |
| 3217 | howto->name, name, (uint64_t) rel->r_offset, |
| 3218 | input_section); |
| 3219 | bfd_set_error (bfd_error_bad_value); |
| 3220 | return FALSE; |
| 3221 | } |
| 3222 | } |
| 3223 | else |
| 3224 | { |
| 3225 | long sindx; |
| 3226 | |
| 3227 | if (bfd_is_abs_section (sec)) |
| 3228 | sindx = 0; |
| 3229 | else if (sec == NULL || sec->owner == NULL) |
| 3230 | { |
| 3231 | bfd_set_error (bfd_error_bad_value); |
| 3232 | return FALSE; |
| 3233 | } |
| 3234 | else |
| 3235 | { |
| 3236 | asection *osec; |
| 3237 | |
| 3238 | /* We are turning this relocation into one |
| 3239 | against a section symbol. It would be |
| 3240 | proper to subtract the symbol's value, |
| 3241 | osec->vma, from the emitted reloc addend, |
| 3242 | but ld.so expects buggy relocs. */ |
| 3243 | osec = sec->output_section; |
| 3244 | sindx = elf_section_data (osec)->dynindx; |
| 3245 | if (sindx == 0) |
| 3246 | { |
| 3247 | asection *oi = htab->elf.text_index_section; |
| 3248 | sindx = elf_section_data (oi)->dynindx; |
| 3249 | } |
| 3250 | BFD_ASSERT (sindx != 0); |
| 3251 | } |
| 3252 | |
| 3253 | outrel.r_info = htab->r_info (sindx, r_type); |
| 3254 | outrel.r_addend = relocation + rel->r_addend; |
| 3255 | } |
| 3256 | } |
| 3257 | |
| 3258 | sreloc = elf_section_data (input_section)->sreloc; |
| 3259 | |
| 3260 | if (sreloc == NULL || sreloc->contents == NULL) |
| 3261 | { |
| 3262 | r = bfd_reloc_notsupported; |
| 3263 | goto check_relocation_error; |
| 3264 | } |
| 3265 | |
| 3266 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3267 | |
| 3268 | /* If this reloc is against an external symbol, we do |
| 3269 | not want to fiddle with the addend. Otherwise, we |
| 3270 | need to include the symbol value so that it becomes |
| 3271 | an addend for the dynamic reloc. */ |
| 3272 | if (! relocate) |
| 3273 | continue; |
| 3274 | } |
| 3275 | |
| 3276 | break; |
| 3277 | |
| 3278 | case R_X86_64_TLSGD: |
| 3279 | case R_X86_64_GOTPC32_TLSDESC: |
| 3280 | case R_X86_64_TLSDESC_CALL: |
| 3281 | case R_X86_64_GOTTPOFF: |
| 3282 | tls_type = GOT_UNKNOWN; |
| 3283 | if (h == NULL && local_got_offsets) |
| 3284 | tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx]; |
| 3285 | else if (h != NULL) |
| 3286 | tls_type = elf_x86_hash_entry (h)->tls_type; |
| 3287 | |
| 3288 | r_type_tls = r_type; |
| 3289 | if (! elf_x86_64_tls_transition (info, input_bfd, |
| 3290 | input_section, contents, |
| 3291 | symtab_hdr, sym_hashes, |
| 3292 | &r_type_tls, tls_type, rel, |
| 3293 | relend, h, r_symndx, TRUE)) |
| 3294 | return FALSE; |
| 3295 | |
| 3296 | if (r_type_tls == R_X86_64_TPOFF32) |
| 3297 | { |
| 3298 | bfd_vma roff = rel->r_offset; |
| 3299 | |
| 3300 | BFD_ASSERT (! unresolved_reloc); |
| 3301 | |
| 3302 | if (r_type == R_X86_64_TLSGD) |
| 3303 | { |
| 3304 | /* GD->LE transition. For 64bit, change |
| 3305 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 3306 | .word 0x6666; rex64; call __tls_get_addr@PLT |
| 3307 | or |
| 3308 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 3309 | .byte 0x66; rex64 |
| 3310 | call *__tls_get_addr@GOTPCREL(%rip) |
| 3311 | which may be converted to |
| 3312 | addr32 call __tls_get_addr |
| 3313 | into: |
| 3314 | movq %fs:0, %rax |
| 3315 | leaq foo@tpoff(%rax), %rax |
| 3316 | For 32bit, change |
| 3317 | leaq foo@tlsgd(%rip), %rdi |
| 3318 | .word 0x6666; rex64; call __tls_get_addr@PLT |
| 3319 | or |
| 3320 | leaq foo@tlsgd(%rip), %rdi |
| 3321 | .byte 0x66; rex64 |
| 3322 | call *__tls_get_addr@GOTPCREL(%rip) |
| 3323 | which may be converted to |
| 3324 | addr32 call __tls_get_addr |
| 3325 | into: |
| 3326 | movl %fs:0, %eax |
| 3327 | leaq foo@tpoff(%rax), %rax |
| 3328 | For largepic, change: |
| 3329 | leaq foo@tlsgd(%rip), %rdi |
| 3330 | movabsq $__tls_get_addr@pltoff, %rax |
| 3331 | addq %r15, %rax |
| 3332 | call *%rax |
| 3333 | into: |
| 3334 | movq %fs:0, %rax |
| 3335 | leaq foo@tpoff(%rax), %rax |
| 3336 | nopw 0x0(%rax,%rax,1) */ |
| 3337 | int largepic = 0; |
| 3338 | if (ABI_64_P (output_bfd)) |
| 3339 | { |
| 3340 | if (contents[roff + 5] == 0xb8) |
| 3341 | { |
| 3342 | memcpy (contents + roff - 3, |
| 3343 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80" |
| 3344 | "\0\0\0\0\x66\x0f\x1f\x44\0", 22); |
| 3345 | largepic = 1; |
| 3346 | } |
| 3347 | else |
| 3348 | memcpy (contents + roff - 4, |
| 3349 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 3350 | 16); |
| 3351 | } |
| 3352 | else |
| 3353 | memcpy (contents + roff - 3, |
| 3354 | "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 3355 | 15); |
| 3356 | bfd_put_32 (output_bfd, |
| 3357 | elf_x86_64_tpoff (info, relocation), |
| 3358 | contents + roff + 8 + largepic); |
| 3359 | /* Skip R_X86_64_PC32, R_X86_64_PLT32, |
| 3360 | R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */ |
| 3361 | rel++; |
| 3362 | wrel++; |
| 3363 | continue; |
| 3364 | } |
| 3365 | else if (r_type == R_X86_64_GOTPC32_TLSDESC) |
| 3366 | { |
| 3367 | /* GDesc -> LE transition. |
| 3368 | It's originally something like: |
| 3369 | leaq x@tlsdesc(%rip), %rax |
| 3370 | |
| 3371 | Change it to: |
| 3372 | movl $x@tpoff, %rax. */ |
| 3373 | |
| 3374 | unsigned int val, type; |
| 3375 | |
| 3376 | type = bfd_get_8 (input_bfd, contents + roff - 3); |
| 3377 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 3378 | bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), |
| 3379 | contents + roff - 3); |
| 3380 | bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); |
| 3381 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 3382 | contents + roff - 1); |
| 3383 | bfd_put_32 (output_bfd, |
| 3384 | elf_x86_64_tpoff (info, relocation), |
| 3385 | contents + roff); |
| 3386 | continue; |
| 3387 | } |
| 3388 | else if (r_type == R_X86_64_TLSDESC_CALL) |
| 3389 | { |
| 3390 | /* GDesc -> LE transition. |
| 3391 | It's originally: |
| 3392 | call *(%rax) |
| 3393 | Turn it into: |
| 3394 | xchg %ax,%ax. */ |
| 3395 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3396 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3397 | continue; |
| 3398 | } |
| 3399 | else if (r_type == R_X86_64_GOTTPOFF) |
| 3400 | { |
| 3401 | /* IE->LE transition: |
| 3402 | For 64bit, originally it can be one of: |
| 3403 | movq foo@gottpoff(%rip), %reg |
| 3404 | addq foo@gottpoff(%rip), %reg |
| 3405 | We change it into: |
| 3406 | movq $foo, %reg |
| 3407 | leaq foo(%reg), %reg |
| 3408 | addq $foo, %reg. |
| 3409 | For 32bit, originally it can be one of: |
| 3410 | movq foo@gottpoff(%rip), %reg |
| 3411 | addl foo@gottpoff(%rip), %reg |
| 3412 | We change it into: |
| 3413 | movq $foo, %reg |
| 3414 | leal foo(%reg), %reg |
| 3415 | addl $foo, %reg. */ |
| 3416 | |
| 3417 | unsigned int val, type, reg; |
| 3418 | |
| 3419 | if (roff >= 3) |
| 3420 | val = bfd_get_8 (input_bfd, contents + roff - 3); |
| 3421 | else |
| 3422 | val = 0; |
| 3423 | type = bfd_get_8 (input_bfd, contents + roff - 2); |
| 3424 | reg = bfd_get_8 (input_bfd, contents + roff - 1); |
| 3425 | reg >>= 3; |
| 3426 | if (type == 0x8b) |
| 3427 | { |
| 3428 | /* movq */ |
| 3429 | if (val == 0x4c) |
| 3430 | bfd_put_8 (output_bfd, 0x49, |
| 3431 | contents + roff - 3); |
| 3432 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 3433 | bfd_put_8 (output_bfd, 0x41, |
| 3434 | contents + roff - 3); |
| 3435 | bfd_put_8 (output_bfd, 0xc7, |
| 3436 | contents + roff - 2); |
| 3437 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 3438 | contents + roff - 1); |
| 3439 | } |
| 3440 | else if (reg == 4) |
| 3441 | { |
| 3442 | /* addq/addl -> addq/addl - addressing with %rsp/%r12 |
| 3443 | is special */ |
| 3444 | if (val == 0x4c) |
| 3445 | bfd_put_8 (output_bfd, 0x49, |
| 3446 | contents + roff - 3); |
| 3447 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 3448 | bfd_put_8 (output_bfd, 0x41, |
| 3449 | contents + roff - 3); |
| 3450 | bfd_put_8 (output_bfd, 0x81, |
| 3451 | contents + roff - 2); |
| 3452 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 3453 | contents + roff - 1); |
| 3454 | } |
| 3455 | else |
| 3456 | { |
| 3457 | /* addq/addl -> leaq/leal */ |
| 3458 | if (val == 0x4c) |
| 3459 | bfd_put_8 (output_bfd, 0x4d, |
| 3460 | contents + roff - 3); |
| 3461 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 3462 | bfd_put_8 (output_bfd, 0x45, |
| 3463 | contents + roff - 3); |
| 3464 | bfd_put_8 (output_bfd, 0x8d, |
| 3465 | contents + roff - 2); |
| 3466 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), |
| 3467 | contents + roff - 1); |
| 3468 | } |
| 3469 | bfd_put_32 (output_bfd, |
| 3470 | elf_x86_64_tpoff (info, relocation), |
| 3471 | contents + roff); |
| 3472 | continue; |
| 3473 | } |
| 3474 | else |
| 3475 | BFD_ASSERT (FALSE); |
| 3476 | } |
| 3477 | |
| 3478 | if (htab->elf.sgot == NULL) |
| 3479 | abort (); |
| 3480 | |
| 3481 | if (h != NULL) |
| 3482 | { |
| 3483 | off = h->got.offset; |
| 3484 | offplt = elf_x86_hash_entry (h)->tlsdesc_got; |
| 3485 | } |
| 3486 | else |
| 3487 | { |
| 3488 | if (local_got_offsets == NULL) |
| 3489 | abort (); |
| 3490 | |
| 3491 | off = local_got_offsets[r_symndx]; |
| 3492 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 3493 | } |
| 3494 | |
| 3495 | if ((off & 1) != 0) |
| 3496 | off &= ~1; |
| 3497 | else |
| 3498 | { |
| 3499 | Elf_Internal_Rela outrel; |
| 3500 | int dr_type, indx; |
| 3501 | asection *sreloc; |
| 3502 | |
| 3503 | if (htab->elf.srelgot == NULL) |
| 3504 | abort (); |
| 3505 | |
| 3506 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 3507 | |
| 3508 | if (GOT_TLS_GDESC_P (tls_type)) |
| 3509 | { |
| 3510 | outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC); |
| 3511 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt |
| 3512 | + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); |
| 3513 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 3514 | + htab->elf.sgotplt->output_offset |
| 3515 | + offplt |
| 3516 | + htab->sgotplt_jump_table_size); |
| 3517 | sreloc = htab->elf.srelplt; |
| 3518 | if (indx == 0) |
| 3519 | outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info); |
| 3520 | else |
| 3521 | outrel.r_addend = 0; |
| 3522 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3523 | } |
| 3524 | |
| 3525 | sreloc = htab->elf.srelgot; |
| 3526 | |
| 3527 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3528 | + htab->elf.sgot->output_offset + off); |
| 3529 | |
| 3530 | if (GOT_TLS_GD_P (tls_type)) |
| 3531 | dr_type = R_X86_64_DTPMOD64; |
| 3532 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 3533 | goto dr_done; |
| 3534 | else |
| 3535 | dr_type = R_X86_64_TPOFF64; |
| 3536 | |
| 3537 | bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); |
| 3538 | outrel.r_addend = 0; |
| 3539 | if ((dr_type == R_X86_64_TPOFF64 |
| 3540 | || dr_type == R_X86_64_TLSDESC) && indx == 0) |
| 3541 | outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info); |
| 3542 | outrel.r_info = htab->r_info (indx, dr_type); |
| 3543 | |
| 3544 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3545 | |
| 3546 | if (GOT_TLS_GD_P (tls_type)) |
| 3547 | { |
| 3548 | if (indx == 0) |
| 3549 | { |
| 3550 | BFD_ASSERT (! unresolved_reloc); |
| 3551 | bfd_put_64 (output_bfd, |
| 3552 | relocation - _bfd_x86_elf_dtpoff_base (info), |
| 3553 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 3554 | } |
| 3555 | else |
| 3556 | { |
| 3557 | bfd_put_64 (output_bfd, 0, |
| 3558 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 3559 | outrel.r_info = htab->r_info (indx, |
| 3560 | R_X86_64_DTPOFF64); |
| 3561 | outrel.r_offset += GOT_ENTRY_SIZE; |
| 3562 | elf_append_rela (output_bfd, sreloc, |
| 3563 | &outrel); |
| 3564 | } |
| 3565 | } |
| 3566 | |
| 3567 | dr_done: |
| 3568 | if (h != NULL) |
| 3569 | h->got.offset |= 1; |
| 3570 | else |
| 3571 | local_got_offsets[r_symndx] |= 1; |
| 3572 | } |
| 3573 | |
| 3574 | if (off >= (bfd_vma) -2 |
| 3575 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 3576 | abort (); |
| 3577 | if (r_type_tls == r_type) |
| 3578 | { |
| 3579 | if (r_type == R_X86_64_GOTPC32_TLSDESC |
| 3580 | || r_type == R_X86_64_TLSDESC_CALL) |
| 3581 | relocation = htab->elf.sgotplt->output_section->vma |
| 3582 | + htab->elf.sgotplt->output_offset |
| 3583 | + offplt + htab->sgotplt_jump_table_size; |
| 3584 | else |
| 3585 | relocation = htab->elf.sgot->output_section->vma |
| 3586 | + htab->elf.sgot->output_offset + off; |
| 3587 | unresolved_reloc = FALSE; |
| 3588 | } |
| 3589 | else |
| 3590 | { |
| 3591 | bfd_vma roff = rel->r_offset; |
| 3592 | |
| 3593 | if (r_type == R_X86_64_TLSGD) |
| 3594 | { |
| 3595 | /* GD->IE transition. For 64bit, change |
| 3596 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 3597 | .word 0x6666; rex64; call __tls_get_addr@PLT |
| 3598 | or |
| 3599 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 3600 | .byte 0x66; rex64 |
| 3601 | call *__tls_get_addr@GOTPCREL(%rip |
| 3602 | which may be converted to |
| 3603 | addr32 call __tls_get_addr |
| 3604 | into: |
| 3605 | movq %fs:0, %rax |
| 3606 | addq foo@gottpoff(%rip), %rax |
| 3607 | For 32bit, change |
| 3608 | leaq foo@tlsgd(%rip), %rdi |
| 3609 | .word 0x6666; rex64; call __tls_get_addr@PLT |
| 3610 | or |
| 3611 | leaq foo@tlsgd(%rip), %rdi |
| 3612 | .byte 0x66; rex64; |
| 3613 | call *__tls_get_addr@GOTPCREL(%rip) |
| 3614 | which may be converted to |
| 3615 | addr32 call __tls_get_addr |
| 3616 | into: |
| 3617 | movl %fs:0, %eax |
| 3618 | addq foo@gottpoff(%rip), %rax |
| 3619 | For largepic, change: |
| 3620 | leaq foo@tlsgd(%rip), %rdi |
| 3621 | movabsq $__tls_get_addr@pltoff, %rax |
| 3622 | addq %r15, %rax |
| 3623 | call *%rax |
| 3624 | into: |
| 3625 | movq %fs:0, %rax |
| 3626 | addq foo@gottpoff(%rax), %rax |
| 3627 | nopw 0x0(%rax,%rax,1) */ |
| 3628 | int largepic = 0; |
| 3629 | if (ABI_64_P (output_bfd)) |
| 3630 | { |
| 3631 | if (contents[roff + 5] == 0xb8) |
| 3632 | { |
| 3633 | memcpy (contents + roff - 3, |
| 3634 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05" |
| 3635 | "\0\0\0\0\x66\x0f\x1f\x44\0", 22); |
| 3636 | largepic = 1; |
| 3637 | } |
| 3638 | else |
| 3639 | memcpy (contents + roff - 4, |
| 3640 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 3641 | 16); |
| 3642 | } |
| 3643 | else |
| 3644 | memcpy (contents + roff - 3, |
| 3645 | "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 3646 | 15); |
| 3647 | |
| 3648 | relocation = (htab->elf.sgot->output_section->vma |
| 3649 | + htab->elf.sgot->output_offset + off |
| 3650 | - roff |
| 3651 | - largepic |
| 3652 | - input_section->output_section->vma |
| 3653 | - input_section->output_offset |
| 3654 | - 12); |
| 3655 | bfd_put_32 (output_bfd, relocation, |
| 3656 | contents + roff + 8 + largepic); |
| 3657 | /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */ |
| 3658 | rel++; |
| 3659 | wrel++; |
| 3660 | continue; |
| 3661 | } |
| 3662 | else if (r_type == R_X86_64_GOTPC32_TLSDESC) |
| 3663 | { |
| 3664 | /* GDesc -> IE transition. |
| 3665 | It's originally something like: |
| 3666 | leaq x@tlsdesc(%rip), %rax |
| 3667 | |
| 3668 | Change it to: |
| 3669 | movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */ |
| 3670 | |
| 3671 | /* Now modify the instruction as appropriate. To |
| 3672 | turn a leaq into a movq in the form we use it, it |
| 3673 | suffices to change the second byte from 0x8d to |
| 3674 | 0x8b. */ |
| 3675 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 3676 | |
| 3677 | bfd_put_32 (output_bfd, |
| 3678 | htab->elf.sgot->output_section->vma |
| 3679 | + htab->elf.sgot->output_offset + off |
| 3680 | - rel->r_offset |
| 3681 | - input_section->output_section->vma |
| 3682 | - input_section->output_offset |
| 3683 | - 4, |
| 3684 | contents + roff); |
| 3685 | continue; |
| 3686 | } |
| 3687 | else if (r_type == R_X86_64_TLSDESC_CALL) |
| 3688 | { |
| 3689 | /* GDesc -> IE transition. |
| 3690 | It's originally: |
| 3691 | call *(%rax) |
| 3692 | |
| 3693 | Change it to: |
| 3694 | xchg %ax, %ax. */ |
| 3695 | |
| 3696 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3697 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3698 | continue; |
| 3699 | } |
| 3700 | else |
| 3701 | BFD_ASSERT (FALSE); |
| 3702 | } |
| 3703 | break; |
| 3704 | |
| 3705 | case R_X86_64_TLSLD: |
| 3706 | if (! elf_x86_64_tls_transition (info, input_bfd, |
| 3707 | input_section, contents, |
| 3708 | symtab_hdr, sym_hashes, |
| 3709 | &r_type, GOT_UNKNOWN, rel, |
| 3710 | relend, h, r_symndx, TRUE)) |
| 3711 | return FALSE; |
| 3712 | |
| 3713 | if (r_type != R_X86_64_TLSLD) |
| 3714 | { |
| 3715 | /* LD->LE transition: |
| 3716 | leaq foo@tlsld(%rip), %rdi |
| 3717 | call __tls_get_addr@PLT |
| 3718 | For 64bit, we change it into: |
| 3719 | .word 0x6666; .byte 0x66; movq %fs:0, %rax |
| 3720 | For 32bit, we change it into: |
| 3721 | nopl 0x0(%rax); movl %fs:0, %eax |
| 3722 | Or |
| 3723 | leaq foo@tlsld(%rip), %rdi; |
| 3724 | call *__tls_get_addr@GOTPCREL(%rip) |
| 3725 | which may be converted to |
| 3726 | addr32 call __tls_get_addr |
| 3727 | For 64bit, we change it into: |
| 3728 | .word 0x6666; .word 0x6666; movq %fs:0, %rax |
| 3729 | For 32bit, we change it into: |
| 3730 | nopw 0x0(%rax); movl %fs:0, %eax |
| 3731 | For largepic, change: |
| 3732 | leaq foo@tlsgd(%rip), %rdi |
| 3733 | movabsq $__tls_get_addr@pltoff, %rax |
| 3734 | addq %rbx, %rax |
| 3735 | call *%rax |
| 3736 | into |
| 3737 | data16 data16 data16 nopw %cs:0x0(%rax,%rax,1) |
| 3738 | movq %fs:0, %eax */ |
| 3739 | |
| 3740 | BFD_ASSERT (r_type == R_X86_64_TPOFF32); |
| 3741 | if (ABI_64_P (output_bfd)) |
| 3742 | { |
| 3743 | if (contents[rel->r_offset + 5] == 0xb8) |
| 3744 | memcpy (contents + rel->r_offset - 3, |
| 3745 | "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0" |
| 3746 | "\x64\x48\x8b\x04\x25\0\0\0", 22); |
| 3747 | else if (contents[rel->r_offset + 4] == 0xff |
| 3748 | || contents[rel->r_offset + 4] == 0x67) |
| 3749 | memcpy (contents + rel->r_offset - 3, |
| 3750 | "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", |
| 3751 | 13); |
| 3752 | else |
| 3753 | memcpy (contents + rel->r_offset - 3, |
| 3754 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); |
| 3755 | } |
| 3756 | else |
| 3757 | { |
| 3758 | if (contents[rel->r_offset + 4] == 0xff) |
| 3759 | memcpy (contents + rel->r_offset - 3, |
| 3760 | "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", |
| 3761 | 13); |
| 3762 | else |
| 3763 | memcpy (contents + rel->r_offset - 3, |
| 3764 | "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12); |
| 3765 | } |
| 3766 | /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX |
| 3767 | and R_X86_64_PLTOFF64. */ |
| 3768 | rel++; |
| 3769 | wrel++; |
| 3770 | continue; |
| 3771 | } |
| 3772 | |
| 3773 | if (htab->elf.sgot == NULL) |
| 3774 | abort (); |
| 3775 | |
| 3776 | off = htab->tls_ld_or_ldm_got.offset; |
| 3777 | if (off & 1) |
| 3778 | off &= ~1; |
| 3779 | else |
| 3780 | { |
| 3781 | Elf_Internal_Rela outrel; |
| 3782 | |
| 3783 | if (htab->elf.srelgot == NULL) |
| 3784 | abort (); |
| 3785 | |
| 3786 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3787 | + htab->elf.sgot->output_offset + off); |
| 3788 | |
| 3789 | bfd_put_64 (output_bfd, 0, |
| 3790 | htab->elf.sgot->contents + off); |
| 3791 | bfd_put_64 (output_bfd, 0, |
| 3792 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 3793 | outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64); |
| 3794 | outrel.r_addend = 0; |
| 3795 | elf_append_rela (output_bfd, htab->elf.srelgot, |
| 3796 | &outrel); |
| 3797 | htab->tls_ld_or_ldm_got.offset |= 1; |
| 3798 | } |
| 3799 | relocation = htab->elf.sgot->output_section->vma |
| 3800 | + htab->elf.sgot->output_offset + off; |
| 3801 | unresolved_reloc = FALSE; |
| 3802 | break; |
| 3803 | |
| 3804 | case R_X86_64_DTPOFF32: |
| 3805 | if (!bfd_link_executable (info) |
| 3806 | || (input_section->flags & SEC_CODE) == 0) |
| 3807 | relocation -= _bfd_x86_elf_dtpoff_base (info); |
| 3808 | else |
| 3809 | relocation = elf_x86_64_tpoff (info, relocation); |
| 3810 | break; |
| 3811 | |
| 3812 | case R_X86_64_TPOFF32: |
| 3813 | case R_X86_64_TPOFF64: |
| 3814 | BFD_ASSERT (bfd_link_executable (info)); |
| 3815 | relocation = elf_x86_64_tpoff (info, relocation); |
| 3816 | break; |
| 3817 | |
| 3818 | case R_X86_64_DTPOFF64: |
| 3819 | BFD_ASSERT ((input_section->flags & SEC_CODE) == 0); |
| 3820 | relocation -= _bfd_x86_elf_dtpoff_base (info); |
| 3821 | break; |
| 3822 | |
| 3823 | default: |
| 3824 | break; |
| 3825 | } |
| 3826 | |
| 3827 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 3828 | because such sections are not SEC_ALLOC and thus ld.so will |
| 3829 | not process them. */ |
| 3830 | if (unresolved_reloc |
| 3831 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 3832 | && h->def_dynamic) |
| 3833 | && _bfd_elf_section_offset (output_bfd, info, input_section, |
| 3834 | rel->r_offset) != (bfd_vma) -1) |
| 3835 | { |
| 3836 | switch (r_type) |
| 3837 | { |
| 3838 | case R_X86_64_32S: |
| 3839 | sec = h->root.u.def.section; |
| 3840 | if ((info->nocopyreloc |
| 3841 | || (eh->def_protected |
| 3842 | && elf_has_no_copy_on_protected (h->root.u.def.section->owner))) |
| 3843 | && !(h->root.u.def.section->flags & SEC_CODE)) |
| 3844 | return elf_x86_64_need_pic (info, input_bfd, input_section, |
| 3845 | h, NULL, NULL, howto); |
| 3846 | /* Fall through. */ |
| 3847 | |
| 3848 | default: |
| 3849 | _bfd_error_handler |
| 3850 | /* xgettext:c-format */ |
| 3851 | (_("%pB(%pA+%#" PRIx64 "): " |
| 3852 | "unresolvable %s relocation against symbol `%s'"), |
| 3853 | input_bfd, |
| 3854 | input_section, |
| 3855 | (uint64_t) rel->r_offset, |
| 3856 | howto->name, |
| 3857 | h->root.root.string); |
| 3858 | return FALSE; |
| 3859 | } |
| 3860 | } |
| 3861 | |
| 3862 | do_relocation: |
| 3863 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3864 | contents, rel->r_offset, |
| 3865 | relocation, rel->r_addend); |
| 3866 | |
| 3867 | check_relocation_error: |
| 3868 | if (r != bfd_reloc_ok) |
| 3869 | { |
| 3870 | const char *name; |
| 3871 | |
| 3872 | if (h != NULL) |
| 3873 | name = h->root.root.string; |
| 3874 | else |
| 3875 | { |
| 3876 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 3877 | symtab_hdr->sh_link, |
| 3878 | sym->st_name); |
| 3879 | if (name == NULL) |
| 3880 | return FALSE; |
| 3881 | if (*name == '\0') |
| 3882 | name = bfd_section_name (input_bfd, sec); |
| 3883 | } |
| 3884 | |
| 3885 | if (r == bfd_reloc_overflow) |
| 3886 | { |
| 3887 | if (converted_reloc) |
| 3888 | { |
| 3889 | info->callbacks->einfo |
| 3890 | (_("%F%P: failed to convert GOTPCREL relocation; relink with --no-relax\n")); |
| 3891 | return FALSE; |
| 3892 | } |
| 3893 | (*info->callbacks->reloc_overflow) |
| 3894 | (info, (h ? &h->root : NULL), name, howto->name, |
| 3895 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 3896 | } |
| 3897 | else |
| 3898 | { |
| 3899 | _bfd_error_handler |
| 3900 | /* xgettext:c-format */ |
| 3901 | (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), |
| 3902 | input_bfd, input_section, |
| 3903 | (uint64_t) rel->r_offset, name, (int) r); |
| 3904 | return FALSE; |
| 3905 | } |
| 3906 | } |
| 3907 | |
| 3908 | if (wrel != rel) |
| 3909 | *wrel = *rel; |
| 3910 | } |
| 3911 | |
| 3912 | if (wrel != rel) |
| 3913 | { |
| 3914 | Elf_Internal_Shdr *rel_hdr; |
| 3915 | size_t deleted = rel - wrel; |
| 3916 | |
| 3917 | rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); |
| 3918 | rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; |
| 3919 | if (rel_hdr->sh_size == 0) |
| 3920 | { |
| 3921 | /* It is too late to remove an empty reloc section. Leave |
| 3922 | one NONE reloc. |
| 3923 | ??? What is wrong with an empty section??? */ |
| 3924 | rel_hdr->sh_size = rel_hdr->sh_entsize; |
| 3925 | deleted -= 1; |
| 3926 | } |
| 3927 | rel_hdr = _bfd_elf_single_rel_hdr (input_section); |
| 3928 | rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; |
| 3929 | input_section->reloc_count -= deleted; |
| 3930 | } |
| 3931 | |
| 3932 | return TRUE; |
| 3933 | } |
| 3934 | |
| 3935 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3936 | dynamic sections here. */ |
| 3937 | |
| 3938 | static bfd_boolean |
| 3939 | elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, |
| 3940 | struct bfd_link_info *info, |
| 3941 | struct elf_link_hash_entry *h, |
| 3942 | Elf_Internal_Sym *sym) |
| 3943 | { |
| 3944 | struct elf_x86_link_hash_table *htab; |
| 3945 | bfd_boolean use_plt_second; |
| 3946 | struct elf_x86_link_hash_entry *eh; |
| 3947 | bfd_boolean local_undefweak; |
| 3948 | |
| 3949 | htab = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 3950 | if (htab == NULL) |
| 3951 | return FALSE; |
| 3952 | |
| 3953 | /* Use the second PLT section only if there is .plt section. */ |
| 3954 | use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL; |
| 3955 | |
| 3956 | eh = (struct elf_x86_link_hash_entry *) h; |
| 3957 | if (eh->no_finish_dynamic_symbol) |
| 3958 | abort (); |
| 3959 | |
| 3960 | /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for |
| 3961 | resolved undefined weak symbols in executable so that their |
| 3962 | references have value 0 at run-time. */ |
| 3963 | local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); |
| 3964 | |
| 3965 | if (h->plt.offset != (bfd_vma) -1) |
| 3966 | { |
| 3967 | bfd_vma plt_index; |
| 3968 | bfd_vma got_offset, plt_offset; |
| 3969 | Elf_Internal_Rela rela; |
| 3970 | bfd_byte *loc; |
| 3971 | asection *plt, *gotplt, *relplt, *resolved_plt; |
| 3972 | const struct elf_backend_data *bed; |
| 3973 | bfd_vma plt_got_pcrel_offset; |
| 3974 | |
| 3975 | /* When building a static executable, use .iplt, .igot.plt and |
| 3976 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ |
| 3977 | if (htab->elf.splt != NULL) |
| 3978 | { |
| 3979 | plt = htab->elf.splt; |
| 3980 | gotplt = htab->elf.sgotplt; |
| 3981 | relplt = htab->elf.srelplt; |
| 3982 | } |
| 3983 | else |
| 3984 | { |
| 3985 | plt = htab->elf.iplt; |
| 3986 | gotplt = htab->elf.igotplt; |
| 3987 | relplt = htab->elf.irelplt; |
| 3988 | } |
| 3989 | |
| 3990 | VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak) |
| 3991 | |
| 3992 | /* Get the index in the procedure linkage table which |
| 3993 | corresponds to this symbol. This is the index of this symbol |
| 3994 | in all the symbols for which we are making plt entries. The |
| 3995 | first entry in the procedure linkage table is reserved. |
| 3996 | |
| 3997 | Get the offset into the .got table of the entry that |
| 3998 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
| 3999 | bytes. The first three are reserved for the dynamic linker. |
| 4000 | |
| 4001 | For static executables, we don't reserve anything. */ |
| 4002 | |
| 4003 | if (plt == htab->elf.splt) |
| 4004 | { |
| 4005 | got_offset = (h->plt.offset / htab->plt.plt_entry_size |
| 4006 | - htab->plt.has_plt0); |
| 4007 | got_offset = (got_offset + 3) * GOT_ENTRY_SIZE; |
| 4008 | } |
| 4009 | else |
| 4010 | { |
| 4011 | got_offset = h->plt.offset / htab->plt.plt_entry_size; |
| 4012 | got_offset = got_offset * GOT_ENTRY_SIZE; |
| 4013 | } |
| 4014 | |
| 4015 | /* Fill in the entry in the procedure linkage table. */ |
| 4016 | memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry, |
| 4017 | htab->plt.plt_entry_size); |
| 4018 | if (use_plt_second) |
| 4019 | { |
| 4020 | memcpy (htab->plt_second->contents + eh->plt_second.offset, |
| 4021 | htab->non_lazy_plt->plt_entry, |
| 4022 | htab->non_lazy_plt->plt_entry_size); |
| 4023 | |
| 4024 | resolved_plt = htab->plt_second; |
| 4025 | plt_offset = eh->plt_second.offset; |
| 4026 | } |
| 4027 | else |
| 4028 | { |
| 4029 | resolved_plt = plt; |
| 4030 | plt_offset = h->plt.offset; |
| 4031 | } |
| 4032 | |
| 4033 | /* Insert the relocation positions of the plt section. */ |
| 4034 | |
| 4035 | /* Put offset the PC-relative instruction referring to the GOT entry, |
| 4036 | subtracting the size of that instruction. */ |
| 4037 | plt_got_pcrel_offset = (gotplt->output_section->vma |
| 4038 | + gotplt->output_offset |
| 4039 | + got_offset |
| 4040 | - resolved_plt->output_section->vma |
| 4041 | - resolved_plt->output_offset |
| 4042 | - plt_offset |
| 4043 | - htab->plt.plt_got_insn_size); |
| 4044 | |
| 4045 | /* Check PC-relative offset overflow in PLT entry. */ |
| 4046 | if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff) |
| 4047 | /* xgettext:c-format */ |
| 4048 | info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"), |
| 4049 | output_bfd, h->root.root.string); |
| 4050 | |
| 4051 | bfd_put_32 (output_bfd, plt_got_pcrel_offset, |
| 4052 | (resolved_plt->contents + plt_offset |
| 4053 | + htab->plt.plt_got_offset)); |
| 4054 | |
| 4055 | /* Fill in the entry in the global offset table, initially this |
| 4056 | points to the second part of the PLT entry. Leave the entry |
| 4057 | as zero for undefined weak symbol in PIE. No PLT relocation |
| 4058 | against undefined weak symbol in PIE. */ |
| 4059 | if (!local_undefweak) |
| 4060 | { |
| 4061 | if (htab->plt.has_plt0) |
| 4062 | bfd_put_64 (output_bfd, (plt->output_section->vma |
| 4063 | + plt->output_offset |
| 4064 | + h->plt.offset |
| 4065 | + htab->lazy_plt->plt_lazy_offset), |
| 4066 | gotplt->contents + got_offset); |
| 4067 | |
| 4068 | /* Fill in the entry in the .rela.plt section. */ |
| 4069 | rela.r_offset = (gotplt->output_section->vma |
| 4070 | + gotplt->output_offset |
| 4071 | + got_offset); |
| 4072 | if (PLT_LOCAL_IFUNC_P (info, h)) |
| 4073 | { |
| 4074 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), |
| 4075 | h->root.root.string, |
| 4076 | h->root.u.def.section->owner); |
| 4077 | |
| 4078 | /* If an STT_GNU_IFUNC symbol is locally defined, generate |
| 4079 | R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ |
| 4080 | rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); |
| 4081 | rela.r_addend = (h->root.u.def.value |
| 4082 | + h->root.u.def.section->output_section->vma |
| 4083 | + h->root.u.def.section->output_offset); |
| 4084 | /* R_X86_64_IRELATIVE comes last. */ |
| 4085 | plt_index = htab->next_irelative_index--; |
| 4086 | } |
| 4087 | else |
| 4088 | { |
| 4089 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); |
| 4090 | rela.r_addend = 0; |
| 4091 | plt_index = htab->next_jump_slot_index++; |
| 4092 | } |
| 4093 | |
| 4094 | /* Don't fill the second and third slots in PLT entry for |
| 4095 | static executables nor without PLT0. */ |
| 4096 | if (plt == htab->elf.splt && htab->plt.has_plt0) |
| 4097 | { |
| 4098 | bfd_vma plt0_offset |
| 4099 | = h->plt.offset + htab->lazy_plt->plt_plt_insn_end; |
| 4100 | |
| 4101 | /* Put relocation index. */ |
| 4102 | bfd_put_32 (output_bfd, plt_index, |
| 4103 | (plt->contents + h->plt.offset |
| 4104 | + htab->lazy_plt->plt_reloc_offset)); |
| 4105 | |
| 4106 | /* Put offset for jmp .PLT0 and check for overflow. We don't |
| 4107 | check relocation index for overflow since branch displacement |
| 4108 | will overflow first. */ |
| 4109 | if (plt0_offset > 0x80000000) |
| 4110 | /* xgettext:c-format */ |
| 4111 | info->callbacks->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"), |
| 4112 | output_bfd, h->root.root.string); |
| 4113 | bfd_put_32 (output_bfd, - plt0_offset, |
| 4114 | (plt->contents + h->plt.offset |
| 4115 | + htab->lazy_plt->plt_plt_offset)); |
| 4116 | } |
| 4117 | |
| 4118 | bed = get_elf_backend_data (output_bfd); |
| 4119 | loc = relplt->contents + plt_index * bed->s->sizeof_rela; |
| 4120 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
| 4121 | } |
| 4122 | } |
| 4123 | else if (eh->plt_got.offset != (bfd_vma) -1) |
| 4124 | { |
| 4125 | bfd_vma got_offset, plt_offset; |
| 4126 | asection *plt, *got; |
| 4127 | bfd_boolean got_after_plt; |
| 4128 | int32_t got_pcrel_offset; |
| 4129 | |
| 4130 | /* Set the entry in the GOT procedure linkage table. */ |
| 4131 | plt = htab->plt_got; |
| 4132 | got = htab->elf.sgot; |
| 4133 | got_offset = h->got.offset; |
| 4134 | |
| 4135 | if (got_offset == (bfd_vma) -1 |
| 4136 | || (h->type == STT_GNU_IFUNC && h->def_regular) |
| 4137 | || plt == NULL |
| 4138 | || got == NULL) |
| 4139 | abort (); |
| 4140 | |
| 4141 | /* Use the non-lazy PLT entry template for the GOT PLT since they |
| 4142 | are the identical. */ |
| 4143 | /* Fill in the entry in the GOT procedure linkage table. */ |
| 4144 | plt_offset = eh->plt_got.offset; |
| 4145 | memcpy (plt->contents + plt_offset, |
| 4146 | htab->non_lazy_plt->plt_entry, |
| 4147 | htab->non_lazy_plt->plt_entry_size); |
| 4148 | |
| 4149 | /* Put offset the PC-relative instruction referring to the GOT |
| 4150 | entry, subtracting the size of that instruction. */ |
| 4151 | got_pcrel_offset = (got->output_section->vma |
| 4152 | + got->output_offset |
| 4153 | + got_offset |
| 4154 | - plt->output_section->vma |
| 4155 | - plt->output_offset |
| 4156 | - plt_offset |
| 4157 | - htab->non_lazy_plt->plt_got_insn_size); |
| 4158 | |
| 4159 | /* Check PC-relative offset overflow in GOT PLT entry. */ |
| 4160 | got_after_plt = got->output_section->vma > plt->output_section->vma; |
| 4161 | if ((got_after_plt && got_pcrel_offset < 0) |
| 4162 | || (!got_after_plt && got_pcrel_offset > 0)) |
| 4163 | /* xgettext:c-format */ |
| 4164 | info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"), |
| 4165 | output_bfd, h->root.root.string); |
| 4166 | |
| 4167 | bfd_put_32 (output_bfd, got_pcrel_offset, |
| 4168 | (plt->contents + plt_offset |
| 4169 | + htab->non_lazy_plt->plt_got_offset)); |
| 4170 | } |
| 4171 | |
| 4172 | if (!local_undefweak |
| 4173 | && !h->def_regular |
| 4174 | && (h->plt.offset != (bfd_vma) -1 |
| 4175 | || eh->plt_got.offset != (bfd_vma) -1)) |
| 4176 | { |
| 4177 | /* Mark the symbol as undefined, rather than as defined in |
| 4178 | the .plt section. Leave the value if there were any |
| 4179 | relocations where pointer equality matters (this is a clue |
| 4180 | for the dynamic linker, to make function pointer |
| 4181 | comparisons work between an application and shared |
| 4182 | library), otherwise set it to zero. If a function is only |
| 4183 | called from a binary, there is no need to slow down |
| 4184 | shared libraries because of that. */ |
| 4185 | sym->st_shndx = SHN_UNDEF; |
| 4186 | if (!h->pointer_equality_needed) |
| 4187 | sym->st_value = 0; |
| 4188 | } |
| 4189 | |
| 4190 | _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym); |
| 4191 | |
| 4192 | /* Don't generate dynamic GOT relocation against undefined weak |
| 4193 | symbol in executable. */ |
| 4194 | if (h->got.offset != (bfd_vma) -1 |
| 4195 | && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type) |
| 4196 | && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE |
| 4197 | && !local_undefweak) |
| 4198 | { |
| 4199 | Elf_Internal_Rela rela; |
| 4200 | asection *relgot = htab->elf.srelgot; |
| 4201 | |
| 4202 | /* This symbol has an entry in the global offset table. Set it |
| 4203 | up. */ |
| 4204 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) |
| 4205 | abort (); |
| 4206 | |
| 4207 | rela.r_offset = (htab->elf.sgot->output_section->vma |
| 4208 | + htab->elf.sgot->output_offset |
| 4209 | + (h->got.offset &~ (bfd_vma) 1)); |
| 4210 | |
| 4211 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 4212 | symbol is defined locally or was forced to be local because |
| 4213 | of a version file, we just want to emit a RELATIVE reloc. |
| 4214 | The entry in the global offset table will already have been |
| 4215 | initialized in the relocate_section function. */ |
| 4216 | if (h->def_regular |
| 4217 | && h->type == STT_GNU_IFUNC) |
| 4218 | { |
| 4219 | if (h->plt.offset == (bfd_vma) -1) |
| 4220 | { |
| 4221 | /* STT_GNU_IFUNC is referenced without PLT. */ |
| 4222 | if (htab->elf.splt == NULL) |
| 4223 | { |
| 4224 | /* use .rel[a].iplt section to store .got relocations |
| 4225 | in static executable. */ |
| 4226 | relgot = htab->elf.irelplt; |
| 4227 | } |
| 4228 | if (SYMBOL_REFERENCES_LOCAL_P (info, h)) |
| 4229 | { |
| 4230 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), |
| 4231 | h->root.root.string, |
| 4232 | h->root.u.def.section->owner); |
| 4233 | |
| 4234 | rela.r_info = htab->r_info (0, |
| 4235 | R_X86_64_IRELATIVE); |
| 4236 | rela.r_addend = (h->root.u.def.value |
| 4237 | + h->root.u.def.section->output_section->vma |
| 4238 | + h->root.u.def.section->output_offset); |
| 4239 | } |
| 4240 | else |
| 4241 | goto do_glob_dat; |
| 4242 | } |
| 4243 | else if (bfd_link_pic (info)) |
| 4244 | { |
| 4245 | /* Generate R_X86_64_GLOB_DAT. */ |
| 4246 | goto do_glob_dat; |
| 4247 | } |
| 4248 | else |
| 4249 | { |
| 4250 | asection *plt; |
| 4251 | bfd_vma plt_offset; |
| 4252 | |
| 4253 | if (!h->pointer_equality_needed) |
| 4254 | abort (); |
| 4255 | |
| 4256 | /* For non-shared object, we can't use .got.plt, which |
| 4257 | contains the real function addres if we need pointer |
| 4258 | equality. We load the GOT entry with the PLT entry. */ |
| 4259 | if (htab->plt_second != NULL) |
| 4260 | { |
| 4261 | plt = htab->plt_second; |
| 4262 | plt_offset = eh->plt_second.offset; |
| 4263 | } |
| 4264 | else |
| 4265 | { |
| 4266 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; |
| 4267 | plt_offset = h->plt.offset; |
| 4268 | } |
| 4269 | bfd_put_64 (output_bfd, (plt->output_section->vma |
| 4270 | + plt->output_offset |
| 4271 | + plt_offset), |
| 4272 | htab->elf.sgot->contents + h->got.offset); |
| 4273 | return TRUE; |
| 4274 | } |
| 4275 | } |
| 4276 | else if (bfd_link_pic (info) |
| 4277 | && SYMBOL_REFERENCES_LOCAL_P (info, h)) |
| 4278 | { |
| 4279 | if (!(h->def_regular || ELF_COMMON_DEF_P (h))) |
| 4280 | return FALSE; |
| 4281 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 4282 | rela.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 4283 | rela.r_addend = (h->root.u.def.value |
| 4284 | + h->root.u.def.section->output_section->vma |
| 4285 | + h->root.u.def.section->output_offset); |
| 4286 | } |
| 4287 | else |
| 4288 | { |
| 4289 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 4290 | do_glob_dat: |
| 4291 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 4292 | htab->elf.sgot->contents + h->got.offset); |
| 4293 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT); |
| 4294 | rela.r_addend = 0; |
| 4295 | } |
| 4296 | |
| 4297 | elf_append_rela (output_bfd, relgot, &rela); |
| 4298 | } |
| 4299 | |
| 4300 | if (h->needs_copy) |
| 4301 | { |
| 4302 | Elf_Internal_Rela rela; |
| 4303 | asection *s; |
| 4304 | |
| 4305 | /* This symbol needs a copy reloc. Set it up. */ |
| 4306 | VERIFY_COPY_RELOC (h, htab) |
| 4307 | |
| 4308 | rela.r_offset = (h->root.u.def.value |
| 4309 | + h->root.u.def.section->output_section->vma |
| 4310 | + h->root.u.def.section->output_offset); |
| 4311 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY); |
| 4312 | rela.r_addend = 0; |
| 4313 | if (h->root.u.def.section == htab->elf.sdynrelro) |
| 4314 | s = htab->elf.sreldynrelro; |
| 4315 | else |
| 4316 | s = htab->elf.srelbss; |
| 4317 | elf_append_rela (output_bfd, s, &rela); |
| 4318 | } |
| 4319 | |
| 4320 | return TRUE; |
| 4321 | } |
| 4322 | |
| 4323 | /* Finish up local dynamic symbol handling. We set the contents of |
| 4324 | various dynamic sections here. */ |
| 4325 | |
| 4326 | static bfd_boolean |
| 4327 | elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) |
| 4328 | { |
| 4329 | struct elf_link_hash_entry *h |
| 4330 | = (struct elf_link_hash_entry *) *slot; |
| 4331 | struct bfd_link_info *info |
| 4332 | = (struct bfd_link_info *) inf; |
| 4333 | |
| 4334 | return elf_x86_64_finish_dynamic_symbol (info->output_bfd, |
| 4335 | info, h, NULL); |
| 4336 | } |
| 4337 | |
| 4338 | /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry |
| 4339 | here since undefined weak symbol may not be dynamic and may not be |
| 4340 | called for elf_x86_64_finish_dynamic_symbol. */ |
| 4341 | |
| 4342 | static bfd_boolean |
| 4343 | elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, |
| 4344 | void *inf) |
| 4345 | { |
| 4346 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; |
| 4347 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 4348 | |
| 4349 | if (h->root.type != bfd_link_hash_undefweak |
| 4350 | || h->dynindx != -1) |
| 4351 | return TRUE; |
| 4352 | |
| 4353 | return elf_x86_64_finish_dynamic_symbol (info->output_bfd, |
| 4354 | info, h, NULL); |
| 4355 | } |
| 4356 | |
| 4357 | /* Used to decide how to sort relocs in an optimal manner for the |
| 4358 | dynamic linker, before writing them out. */ |
| 4359 | |
| 4360 | static enum elf_reloc_type_class |
| 4361 | elf_x86_64_reloc_type_class (const struct bfd_link_info *info, |
| 4362 | const asection *rel_sec ATTRIBUTE_UNUSED, |
| 4363 | const Elf_Internal_Rela *rela) |
| 4364 | { |
| 4365 | bfd *abfd = info->output_bfd; |
| 4366 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 4367 | struct elf_x86_link_hash_table *htab |
| 4368 | = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 4369 | |
| 4370 | if (htab->elf.dynsym != NULL |
| 4371 | && htab->elf.dynsym->contents != NULL) |
| 4372 | { |
| 4373 | /* Check relocation against STT_GNU_IFUNC symbol if there are |
| 4374 | dynamic symbols. */ |
| 4375 | unsigned long r_symndx = htab->r_sym (rela->r_info); |
| 4376 | if (r_symndx != STN_UNDEF) |
| 4377 | { |
| 4378 | Elf_Internal_Sym sym; |
| 4379 | if (!bed->s->swap_symbol_in (abfd, |
| 4380 | (htab->elf.dynsym->contents |
| 4381 | + r_symndx * bed->s->sizeof_sym), |
| 4382 | 0, &sym)) |
| 4383 | abort (); |
| 4384 | |
| 4385 | if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) |
| 4386 | return reloc_class_ifunc; |
| 4387 | } |
| 4388 | } |
| 4389 | |
| 4390 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 4391 | { |
| 4392 | case R_X86_64_IRELATIVE: |
| 4393 | return reloc_class_ifunc; |
| 4394 | case R_X86_64_RELATIVE: |
| 4395 | case R_X86_64_RELATIVE64: |
| 4396 | return reloc_class_relative; |
| 4397 | case R_X86_64_JUMP_SLOT: |
| 4398 | return reloc_class_plt; |
| 4399 | case R_X86_64_COPY: |
| 4400 | return reloc_class_copy; |
| 4401 | default: |
| 4402 | return reloc_class_normal; |
| 4403 | } |
| 4404 | } |
| 4405 | |
| 4406 | /* Finish up the dynamic sections. */ |
| 4407 | |
| 4408 | static bfd_boolean |
| 4409 | elf_x86_64_finish_dynamic_sections (bfd *output_bfd, |
| 4410 | struct bfd_link_info *info) |
| 4411 | { |
| 4412 | struct elf_x86_link_hash_table *htab; |
| 4413 | |
| 4414 | htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info); |
| 4415 | if (htab == NULL) |
| 4416 | return FALSE; |
| 4417 | |
| 4418 | if (! htab->elf.dynamic_sections_created) |
| 4419 | return TRUE; |
| 4420 | |
| 4421 | if (htab->elf.splt && htab->elf.splt->size > 0) |
| 4422 | { |
| 4423 | elf_section_data (htab->elf.splt->output_section) |
| 4424 | ->this_hdr.sh_entsize = htab->plt.plt_entry_size; |
| 4425 | |
| 4426 | if (htab->plt.has_plt0) |
| 4427 | { |
| 4428 | /* Fill in the special first entry in the procedure linkage |
| 4429 | table. */ |
| 4430 | memcpy (htab->elf.splt->contents, |
| 4431 | htab->lazy_plt->plt0_entry, |
| 4432 | htab->lazy_plt->plt0_entry_size); |
| 4433 | /* Add offset for pushq GOT+8(%rip), since the instruction |
| 4434 | uses 6 bytes subtract this value. */ |
| 4435 | bfd_put_32 (output_bfd, |
| 4436 | (htab->elf.sgotplt->output_section->vma |
| 4437 | + htab->elf.sgotplt->output_offset |
| 4438 | + 8 |
| 4439 | - htab->elf.splt->output_section->vma |
| 4440 | - htab->elf.splt->output_offset |
| 4441 | - 6), |
| 4442 | (htab->elf.splt->contents |
| 4443 | + htab->lazy_plt->plt0_got1_offset)); |
| 4444 | /* Add offset for the PC-relative instruction accessing |
| 4445 | GOT+16, subtracting the offset to the end of that |
| 4446 | instruction. */ |
| 4447 | bfd_put_32 (output_bfd, |
| 4448 | (htab->elf.sgotplt->output_section->vma |
| 4449 | + htab->elf.sgotplt->output_offset |
| 4450 | + 16 |
| 4451 | - htab->elf.splt->output_section->vma |
| 4452 | - htab->elf.splt->output_offset |
| 4453 | - htab->lazy_plt->plt0_got2_insn_end), |
| 4454 | (htab->elf.splt->contents |
| 4455 | + htab->lazy_plt->plt0_got2_offset)); |
| 4456 | } |
| 4457 | |
| 4458 | if (htab->tlsdesc_plt) |
| 4459 | { |
| 4460 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 4461 | htab->elf.sgot->contents + htab->tlsdesc_got); |
| 4462 | |
| 4463 | memcpy (htab->elf.splt->contents + htab->tlsdesc_plt, |
| 4464 | htab->lazy_plt->plt_tlsdesc_entry, |
| 4465 | htab->lazy_plt->plt_tlsdesc_entry_size); |
| 4466 | |
| 4467 | /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4 |
| 4468 | bytes and the instruction uses 6 bytes, subtract these |
| 4469 | values. */ |
| 4470 | bfd_put_32 (output_bfd, |
| 4471 | (htab->elf.sgotplt->output_section->vma |
| 4472 | + htab->elf.sgotplt->output_offset |
| 4473 | + 8 |
| 4474 | - htab->elf.splt->output_section->vma |
| 4475 | - htab->elf.splt->output_offset |
| 4476 | - htab->tlsdesc_plt |
| 4477 | - htab->lazy_plt->plt_tlsdesc_got1_insn_end), |
| 4478 | (htab->elf.splt->contents |
| 4479 | + htab->tlsdesc_plt |
| 4480 | + htab->lazy_plt->plt_tlsdesc_got1_offset)); |
| 4481 | /* Add offset for indirect branch via GOT+TDG, where TDG |
| 4482 | stands for htab->tlsdesc_got, subtracting the offset |
| 4483 | to the end of that instruction. */ |
| 4484 | bfd_put_32 (output_bfd, |
| 4485 | (htab->elf.sgot->output_section->vma |
| 4486 | + htab->elf.sgot->output_offset |
| 4487 | + htab->tlsdesc_got |
| 4488 | - htab->elf.splt->output_section->vma |
| 4489 | - htab->elf.splt->output_offset |
| 4490 | - htab->tlsdesc_plt |
| 4491 | - htab->lazy_plt->plt_tlsdesc_got2_insn_end), |
| 4492 | (htab->elf.splt->contents |
| 4493 | + htab->tlsdesc_plt |
| 4494 | + htab->lazy_plt->plt_tlsdesc_got2_offset)); |
| 4495 | } |
| 4496 | } |
| 4497 | |
| 4498 | /* Fill PLT entries for undefined weak symbols in PIE. */ |
| 4499 | if (bfd_link_pie (info)) |
| 4500 | bfd_hash_traverse (&info->hash->table, |
| 4501 | elf_x86_64_pie_finish_undefweak_symbol, |
| 4502 | info); |
| 4503 | |
| 4504 | return TRUE; |
| 4505 | } |
| 4506 | |
| 4507 | /* Fill PLT/GOT entries and allocate dynamic relocations for local |
| 4508 | STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. |
| 4509 | It has to be done before elf_link_sort_relocs is called so that |
| 4510 | dynamic relocations are properly sorted. */ |
| 4511 | |
| 4512 | static bfd_boolean |
| 4513 | elf_x86_64_output_arch_local_syms |
| 4514 | (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 4515 | struct bfd_link_info *info, |
| 4516 | void *flaginfo ATTRIBUTE_UNUSED, |
| 4517 | int (*func) (void *, const char *, |
| 4518 | Elf_Internal_Sym *, |
| 4519 | asection *, |
| 4520 | struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) |
| 4521 | { |
| 4522 | struct elf_x86_link_hash_table *htab |
| 4523 | = elf_x86_hash_table (info, X86_64_ELF_DATA); |
| 4524 | if (htab == NULL) |
| 4525 | return FALSE; |
| 4526 | |
| 4527 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
| 4528 | htab_traverse (htab->loc_hash_table, |
| 4529 | elf_x86_64_finish_local_dynamic_symbol, |
| 4530 | info); |
| 4531 | |
| 4532 | return TRUE; |
| 4533 | } |
| 4534 | |
| 4535 | /* Forward declaration. */ |
| 4536 | static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt; |
| 4537 | |
| 4538 | /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all |
| 4539 | dynamic relocations. */ |
| 4540 | |
| 4541 | static long |
| 4542 | elf_x86_64_get_synthetic_symtab (bfd *abfd, |
| 4543 | long symcount ATTRIBUTE_UNUSED, |
| 4544 | asymbol **syms ATTRIBUTE_UNUSED, |
| 4545 | long dynsymcount, |
| 4546 | asymbol **dynsyms, |
| 4547 | asymbol **ret) |
| 4548 | { |
| 4549 | long count, i, n; |
| 4550 | int j; |
| 4551 | bfd_byte *plt_contents; |
| 4552 | long relsize; |
| 4553 | const struct elf_x86_lazy_plt_layout *lazy_plt; |
| 4554 | const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; |
| 4555 | const struct elf_x86_lazy_plt_layout *lazy_bnd_plt; |
| 4556 | const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt; |
| 4557 | const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; |
| 4558 | const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; |
| 4559 | asection *plt; |
| 4560 | enum elf_x86_plt_type plt_type; |
| 4561 | struct elf_x86_plt plts[] = |
| 4562 | { |
| 4563 | { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 }, |
| 4564 | { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }, |
| 4565 | { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 }, |
| 4566 | { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 }, |
| 4567 | { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 } |
| 4568 | }; |
| 4569 | |
| 4570 | *ret = NULL; |
| 4571 | |
| 4572 | if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) |
| 4573 | return 0; |
| 4574 | |
| 4575 | if (dynsymcount <= 0) |
| 4576 | return 0; |
| 4577 | |
| 4578 | relsize = bfd_get_dynamic_reloc_upper_bound (abfd); |
| 4579 | if (relsize <= 0) |
| 4580 | return -1; |
| 4581 | |
| 4582 | if (get_elf_x86_backend_data (abfd)->target_os != is_nacl) |
| 4583 | { |
| 4584 | lazy_plt = &elf_x86_64_lazy_plt; |
| 4585 | non_lazy_plt = &elf_x86_64_non_lazy_plt; |
| 4586 | lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt; |
| 4587 | non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt; |
| 4588 | if (ABI_64_P (abfd)) |
| 4589 | { |
| 4590 | lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt; |
| 4591 | non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt; |
| 4592 | } |
| 4593 | else |
| 4594 | { |
| 4595 | lazy_ibt_plt = &elf_x32_lazy_ibt_plt; |
| 4596 | non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt; |
| 4597 | } |
| 4598 | } |
| 4599 | else |
| 4600 | { |
| 4601 | lazy_plt = &elf_x86_64_nacl_plt; |
| 4602 | non_lazy_plt = NULL; |
| 4603 | lazy_bnd_plt = NULL; |
| 4604 | non_lazy_bnd_plt = NULL; |
| 4605 | lazy_ibt_plt = NULL; |
| 4606 | non_lazy_ibt_plt = NULL; |
| 4607 | } |
| 4608 | |
| 4609 | count = 0; |
| 4610 | for (j = 0; plts[j].name != NULL; j++) |
| 4611 | { |
| 4612 | plt = bfd_get_section_by_name (abfd, plts[j].name); |
| 4613 | if (plt == NULL || plt->size == 0) |
| 4614 | continue; |
| 4615 | |
| 4616 | /* Get the PLT section contents. */ |
| 4617 | plt_contents = (bfd_byte *) bfd_malloc (plt->size); |
| 4618 | if (plt_contents == NULL) |
| 4619 | break; |
| 4620 | if (!bfd_get_section_contents (abfd, (asection *) plt, |
| 4621 | plt_contents, 0, plt->size)) |
| 4622 | { |
| 4623 | free (plt_contents); |
| 4624 | break; |
| 4625 | } |
| 4626 | |
| 4627 | /* Check what kind of PLT it is. */ |
| 4628 | plt_type = plt_unknown; |
| 4629 | if (plts[j].type == plt_unknown |
| 4630 | && (plt->size >= (lazy_plt->plt_entry_size |
| 4631 | + lazy_plt->plt_entry_size))) |
| 4632 | { |
| 4633 | /* Match lazy PLT first. Need to check the first two |
| 4634 | instructions. */ |
| 4635 | if ((memcmp (plt_contents, lazy_plt->plt0_entry, |
| 4636 | lazy_plt->plt0_got1_offset) == 0) |
| 4637 | && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6, |
| 4638 | 2) == 0)) |
| 4639 | plt_type = plt_lazy; |
| 4640 | else if (lazy_bnd_plt != NULL |
| 4641 | && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry, |
| 4642 | lazy_bnd_plt->plt0_got1_offset) == 0) |
| 4643 | && (memcmp (plt_contents + 6, |
| 4644 | lazy_bnd_plt->plt0_entry + 6, 3) == 0)) |
| 4645 | { |
| 4646 | plt_type = plt_lazy | plt_second; |
| 4647 | /* The fist entry in the lazy IBT PLT is the same as the |
| 4648 | lazy BND PLT. */ |
| 4649 | if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size, |
| 4650 | lazy_ibt_plt->plt_entry, |
| 4651 | lazy_ibt_plt->plt_got_offset) == 0)) |
| 4652 | lazy_plt = lazy_ibt_plt; |
| 4653 | else |
| 4654 | lazy_plt = lazy_bnd_plt; |
| 4655 | } |
| 4656 | } |
| 4657 | |
| 4658 | if (non_lazy_plt != NULL |
| 4659 | && (plt_type == plt_unknown || plt_type == plt_non_lazy) |
| 4660 | && plt->size >= non_lazy_plt->plt_entry_size) |
| 4661 | { |
| 4662 | /* Match non-lazy PLT. */ |
| 4663 | if (memcmp (plt_contents, non_lazy_plt->plt_entry, |
| 4664 | non_lazy_plt->plt_got_offset) == 0) |
| 4665 | plt_type = plt_non_lazy; |
| 4666 | } |
| 4667 | |
| 4668 | if (plt_type == plt_unknown || plt_type == plt_second) |
| 4669 | { |
| 4670 | if (non_lazy_bnd_plt != NULL |
| 4671 | && plt->size >= non_lazy_bnd_plt->plt_entry_size |
| 4672 | && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry, |
| 4673 | non_lazy_bnd_plt->plt_got_offset) == 0)) |
| 4674 | { |
| 4675 | /* Match BND PLT. */ |
| 4676 | plt_type = plt_second; |
| 4677 | non_lazy_plt = non_lazy_bnd_plt; |
| 4678 | } |
| 4679 | else if (non_lazy_ibt_plt != NULL |
| 4680 | && plt->size >= non_lazy_ibt_plt->plt_entry_size |
| 4681 | && (memcmp (plt_contents, |
| 4682 | non_lazy_ibt_plt->plt_entry, |
| 4683 | non_lazy_ibt_plt->plt_got_offset) == 0)) |
| 4684 | { |
| 4685 | /* Match IBT PLT. */ |
| 4686 | plt_type = plt_second; |
| 4687 | non_lazy_plt = non_lazy_ibt_plt; |
| 4688 | } |
| 4689 | } |
| 4690 | |
| 4691 | if (plt_type == plt_unknown) |
| 4692 | { |
| 4693 | free (plt_contents); |
| 4694 | continue; |
| 4695 | } |
| 4696 | |
| 4697 | plts[j].sec = plt; |
| 4698 | plts[j].type = plt_type; |
| 4699 | |
| 4700 | if ((plt_type & plt_lazy)) |
| 4701 | { |
| 4702 | plts[j].plt_got_offset = lazy_plt->plt_got_offset; |
| 4703 | plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size; |
| 4704 | plts[j].plt_entry_size = lazy_plt->plt_entry_size; |
| 4705 | /* Skip PLT0 in lazy PLT. */ |
| 4706 | i = 1; |
| 4707 | } |
| 4708 | else |
| 4709 | { |
| 4710 | plts[j].plt_got_offset = non_lazy_plt->plt_got_offset; |
| 4711 | plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size; |
| 4712 | plts[j].plt_entry_size = non_lazy_plt->plt_entry_size; |
| 4713 | i = 0; |
| 4714 | } |
| 4715 | |
| 4716 | /* Skip lazy PLT when the second PLT is used. */ |
| 4717 | if (plt_type == (plt_lazy | plt_second)) |
| 4718 | plts[j].count = 0; |
| 4719 | else |
| 4720 | { |
| 4721 | n = plt->size / plts[j].plt_entry_size; |
| 4722 | plts[j].count = n; |
| 4723 | count += n - i; |
| 4724 | } |
| 4725 | |
| 4726 | plts[j].contents = plt_contents; |
| 4727 | } |
| 4728 | |
| 4729 | return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize, |
| 4730 | (bfd_vma) 0, plts, dynsyms, |
| 4731 | ret); |
| 4732 | } |
| 4733 | |
| 4734 | /* Handle an x86-64 specific section when reading an object file. This |
| 4735 | is called when elfcode.h finds a section with an unknown type. */ |
| 4736 | |
| 4737 | static bfd_boolean |
| 4738 | elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr, |
| 4739 | const char *name, int shindex) |
| 4740 | { |
| 4741 | if (hdr->sh_type != SHT_X86_64_UNWIND) |
| 4742 | return FALSE; |
| 4743 | |
| 4744 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) |
| 4745 | return FALSE; |
| 4746 | |
| 4747 | return TRUE; |
| 4748 | } |
| 4749 | |
| 4750 | /* Hook called by the linker routine which adds symbols from an object |
| 4751 | file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead |
| 4752 | of .bss. */ |
| 4753 | |
| 4754 | static bfd_boolean |
| 4755 | elf_x86_64_add_symbol_hook (bfd *abfd, |
| 4756 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 4757 | Elf_Internal_Sym *sym, |
| 4758 | const char **namep ATTRIBUTE_UNUSED, |
| 4759 | flagword *flagsp ATTRIBUTE_UNUSED, |
| 4760 | asection **secp, |
| 4761 | bfd_vma *valp) |
| 4762 | { |
| 4763 | asection *lcomm; |
| 4764 | |
| 4765 | switch (sym->st_shndx) |
| 4766 | { |
| 4767 | case SHN_X86_64_LCOMMON: |
| 4768 | lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); |
| 4769 | if (lcomm == NULL) |
| 4770 | { |
| 4771 | lcomm = bfd_make_section_with_flags (abfd, |
| 4772 | "LARGE_COMMON", |
| 4773 | (SEC_ALLOC |
| 4774 | | SEC_IS_COMMON |
| 4775 | | SEC_LINKER_CREATED)); |
| 4776 | if (lcomm == NULL) |
| 4777 | return FALSE; |
| 4778 | elf_section_flags (lcomm) |= SHF_X86_64_LARGE; |
| 4779 | } |
| 4780 | *secp = lcomm; |
| 4781 | *valp = sym->st_size; |
| 4782 | return TRUE; |
| 4783 | } |
| 4784 | |
| 4785 | return TRUE; |
| 4786 | } |
| 4787 | |
| 4788 | |
| 4789 | /* Given a BFD section, try to locate the corresponding ELF section |
| 4790 | index. */ |
| 4791 | |
| 4792 | static bfd_boolean |
| 4793 | elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, |
| 4794 | asection *sec, int *index_return) |
| 4795 | { |
| 4796 | if (sec == &_bfd_elf_large_com_section) |
| 4797 | { |
| 4798 | *index_return = SHN_X86_64_LCOMMON; |
| 4799 | return TRUE; |
| 4800 | } |
| 4801 | return FALSE; |
| 4802 | } |
| 4803 | |
| 4804 | /* Process a symbol. */ |
| 4805 | |
| 4806 | static void |
| 4807 | elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, |
| 4808 | asymbol *asym) |
| 4809 | { |
| 4810 | elf_symbol_type *elfsym = (elf_symbol_type *) asym; |
| 4811 | |
| 4812 | switch (elfsym->internal_elf_sym.st_shndx) |
| 4813 | { |
| 4814 | case SHN_X86_64_LCOMMON: |
| 4815 | asym->section = &_bfd_elf_large_com_section; |
| 4816 | asym->value = elfsym->internal_elf_sym.st_size; |
| 4817 | /* Common symbol doesn't set BSF_GLOBAL. */ |
| 4818 | asym->flags &= ~BSF_GLOBAL; |
| 4819 | break; |
| 4820 | } |
| 4821 | } |
| 4822 | |
| 4823 | static bfd_boolean |
| 4824 | elf_x86_64_common_definition (Elf_Internal_Sym *sym) |
| 4825 | { |
| 4826 | return (sym->st_shndx == SHN_COMMON |
| 4827 | || sym->st_shndx == SHN_X86_64_LCOMMON); |
| 4828 | } |
| 4829 | |
| 4830 | static unsigned int |
| 4831 | elf_x86_64_common_section_index (asection *sec) |
| 4832 | { |
| 4833 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 4834 | return SHN_COMMON; |
| 4835 | else |
| 4836 | return SHN_X86_64_LCOMMON; |
| 4837 | } |
| 4838 | |
| 4839 | static asection * |
| 4840 | elf_x86_64_common_section (asection *sec) |
| 4841 | { |
| 4842 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 4843 | return bfd_com_section_ptr; |
| 4844 | else |
| 4845 | return &_bfd_elf_large_com_section; |
| 4846 | } |
| 4847 | |
| 4848 | static bfd_boolean |
| 4849 | elf_x86_64_merge_symbol (struct elf_link_hash_entry *h, |
| 4850 | const Elf_Internal_Sym *sym, |
| 4851 | asection **psec, |
| 4852 | bfd_boolean newdef, |
| 4853 | bfd_boolean olddef, |
| 4854 | bfd *oldbfd, |
| 4855 | const asection *oldsec) |
| 4856 | { |
| 4857 | /* A normal common symbol and a large common symbol result in a |
| 4858 | normal common symbol. We turn the large common symbol into a |
| 4859 | normal one. */ |
| 4860 | if (!olddef |
| 4861 | && h->root.type == bfd_link_hash_common |
| 4862 | && !newdef |
| 4863 | && bfd_is_com_section (*psec) |
| 4864 | && oldsec != *psec) |
| 4865 | { |
| 4866 | if (sym->st_shndx == SHN_COMMON |
| 4867 | && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0) |
| 4868 | { |
| 4869 | h->root.u.c.p->section |
| 4870 | = bfd_make_section_old_way (oldbfd, "COMMON"); |
| 4871 | h->root.u.c.p->section->flags = SEC_ALLOC; |
| 4872 | } |
| 4873 | else if (sym->st_shndx == SHN_X86_64_LCOMMON |
| 4874 | && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0) |
| 4875 | *psec = bfd_com_section_ptr; |
| 4876 | } |
| 4877 | |
| 4878 | return TRUE; |
| 4879 | } |
| 4880 | |
| 4881 | static int |
| 4882 | elf_x86_64_additional_program_headers (bfd *abfd, |
| 4883 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 4884 | { |
| 4885 | asection *s; |
| 4886 | int count = 0; |
| 4887 | |
| 4888 | /* Check to see if we need a large readonly segment. */ |
| 4889 | s = bfd_get_section_by_name (abfd, ".lrodata"); |
| 4890 | if (s && (s->flags & SEC_LOAD)) |
| 4891 | count++; |
| 4892 | |
| 4893 | /* Check to see if we need a large data segment. Since .lbss sections |
| 4894 | is placed right after the .bss section, there should be no need for |
| 4895 | a large data segment just because of .lbss. */ |
| 4896 | s = bfd_get_section_by_name (abfd, ".ldata"); |
| 4897 | if (s && (s->flags & SEC_LOAD)) |
| 4898 | count++; |
| 4899 | |
| 4900 | return count; |
| 4901 | } |
| 4902 | |
| 4903 | /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */ |
| 4904 | |
| 4905 | static bfd_boolean |
| 4906 | elf_x86_64_relocs_compatible (const bfd_target *input, |
| 4907 | const bfd_target *output) |
| 4908 | { |
| 4909 | return ((xvec_get_elf_backend_data (input)->s->elfclass |
| 4910 | == xvec_get_elf_backend_data (output)->s->elfclass) |
| 4911 | && _bfd_elf_relocs_compatible (input, output)); |
| 4912 | } |
| 4913 | |
| 4914 | /* Set up x86-64 GNU properties. Return the first relocatable ELF input |
| 4915 | with GNU properties if found. Otherwise, return NULL. */ |
| 4916 | |
| 4917 | static bfd * |
| 4918 | elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info) |
| 4919 | { |
| 4920 | struct elf_x86_init_table init_table; |
| 4921 | |
| 4922 | if ((int) R_X86_64_standard >= (int) R_X86_64_converted_reloc_bit |
| 4923 | || (int) R_X86_64_max <= (int) R_X86_64_converted_reloc_bit |
| 4924 | || ((int) (R_X86_64_GNU_VTINHERIT | R_X86_64_converted_reloc_bit) |
| 4925 | != (int) R_X86_64_GNU_VTINHERIT) |
| 4926 | || ((int) (R_X86_64_GNU_VTENTRY | R_X86_64_converted_reloc_bit) |
| 4927 | != (int) R_X86_64_GNU_VTENTRY)) |
| 4928 | abort (); |
| 4929 | |
| 4930 | /* This is unused for x86-64. */ |
| 4931 | init_table.plt0_pad_byte = 0x90; |
| 4932 | |
| 4933 | if (get_elf_x86_backend_data (info->output_bfd)->target_os != is_nacl) |
| 4934 | { |
| 4935 | if (info->bndplt) |
| 4936 | { |
| 4937 | init_table.lazy_plt = &elf_x86_64_lazy_bnd_plt; |
| 4938 | init_table.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt; |
| 4939 | } |
| 4940 | else |
| 4941 | { |
| 4942 | init_table.lazy_plt = &elf_x86_64_lazy_plt; |
| 4943 | init_table.non_lazy_plt = &elf_x86_64_non_lazy_plt; |
| 4944 | } |
| 4945 | |
| 4946 | if (ABI_64_P (info->output_bfd)) |
| 4947 | { |
| 4948 | init_table.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt; |
| 4949 | init_table.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt; |
| 4950 | } |
| 4951 | else |
| 4952 | { |
| 4953 | init_table.lazy_ibt_plt = &elf_x32_lazy_ibt_plt; |
| 4954 | init_table.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt; |
| 4955 | } |
| 4956 | } |
| 4957 | else |
| 4958 | { |
| 4959 | init_table.lazy_plt = &elf_x86_64_nacl_plt; |
| 4960 | init_table.non_lazy_plt = NULL; |
| 4961 | init_table.lazy_ibt_plt = NULL; |
| 4962 | init_table.non_lazy_ibt_plt = NULL; |
| 4963 | } |
| 4964 | |
| 4965 | if (ABI_64_P (info->output_bfd)) |
| 4966 | { |
| 4967 | init_table.r_info = elf64_r_info; |
| 4968 | init_table.r_sym = elf64_r_sym; |
| 4969 | } |
| 4970 | else |
| 4971 | { |
| 4972 | init_table.r_info = elf32_r_info; |
| 4973 | init_table.r_sym = elf32_r_sym; |
| 4974 | } |
| 4975 | |
| 4976 | return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table); |
| 4977 | } |
| 4978 | |
| 4979 | static const struct bfd_elf_special_section |
| 4980 | elf_x86_64_special_sections[]= |
| 4981 | { |
| 4982 | { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 4983 | { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 4984 | { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, |
| 4985 | { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 4986 | { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 4987 | { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 4988 | { NULL, 0, 0, 0, 0 } |
| 4989 | }; |
| 4990 | |
| 4991 | #define TARGET_LITTLE_SYM x86_64_elf64_vec |
| 4992 | #define TARGET_LITTLE_NAME "elf64-x86-64" |
| 4993 | #define ELF_ARCH bfd_arch_i386 |
| 4994 | #define ELF_TARGET_ID X86_64_ELF_DATA |
| 4995 | #define ELF_MACHINE_CODE EM_X86_64 |
| 4996 | #if DEFAULT_LD_Z_SEPARATE_CODE |
| 4997 | # define ELF_MAXPAGESIZE 0x1000 |
| 4998 | #else |
| 4999 | # define ELF_MAXPAGESIZE 0x200000 |
| 5000 | #endif |
| 5001 | #define ELF_MINPAGESIZE 0x1000 |
| 5002 | #define ELF_COMMONPAGESIZE 0x1000 |
| 5003 | |
| 5004 | #define elf_backend_can_gc_sections 1 |
| 5005 | #define elf_backend_can_refcount 1 |
| 5006 | #define elf_backend_want_got_plt 1 |
| 5007 | #define elf_backend_plt_readonly 1 |
| 5008 | #define elf_backend_want_plt_sym 0 |
| 5009 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) |
| 5010 | #define elf_backend_rela_normal 1 |
| 5011 | #define elf_backend_plt_alignment 4 |
| 5012 | #define elf_backend_extern_protected_data 1 |
| 5013 | #define elf_backend_caches_rawsize 1 |
| 5014 | #define elf_backend_dtrel_excludes_plt 1 |
| 5015 | #define elf_backend_want_dynrelro 1 |
| 5016 | |
| 5017 | #define elf_info_to_howto elf_x86_64_info_to_howto |
| 5018 | |
| 5019 | #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup |
| 5020 | #define bfd_elf64_bfd_reloc_name_lookup \ |
| 5021 | elf_x86_64_reloc_name_lookup |
| 5022 | |
| 5023 | #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible |
| 5024 | #define elf_backend_check_relocs elf_x86_64_check_relocs |
| 5025 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections |
| 5026 | #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections |
| 5027 | #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol |
| 5028 | #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms |
| 5029 | #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus |
| 5030 | #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo |
| 5031 | #ifdef CORE_HEADER |
| 5032 | #define elf_backend_write_core_note elf_x86_64_write_core_note |
| 5033 | #endif |
| 5034 | #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class |
| 5035 | #define elf_backend_relocate_section elf_x86_64_relocate_section |
| 5036 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 5037 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 5038 | #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab |
| 5039 | |
| 5040 | #define elf_backend_section_from_shdr \ |
| 5041 | elf_x86_64_section_from_shdr |
| 5042 | |
| 5043 | #define elf_backend_section_from_bfd_section \ |
| 5044 | elf_x86_64_elf_section_from_bfd_section |
| 5045 | #define elf_backend_add_symbol_hook \ |
| 5046 | elf_x86_64_add_symbol_hook |
| 5047 | #define elf_backend_symbol_processing \ |
| 5048 | elf_x86_64_symbol_processing |
| 5049 | #define elf_backend_common_section_index \ |
| 5050 | elf_x86_64_common_section_index |
| 5051 | #define elf_backend_common_section \ |
| 5052 | elf_x86_64_common_section |
| 5053 | #define elf_backend_common_definition \ |
| 5054 | elf_x86_64_common_definition |
| 5055 | #define elf_backend_merge_symbol \ |
| 5056 | elf_x86_64_merge_symbol |
| 5057 | #define elf_backend_special_sections \ |
| 5058 | elf_x86_64_special_sections |
| 5059 | #define elf_backend_additional_program_headers \ |
| 5060 | elf_x86_64_additional_program_headers |
| 5061 | #define elf_backend_setup_gnu_properties \ |
| 5062 | elf_x86_64_link_setup_gnu_properties |
| 5063 | #define elf_backend_hide_symbol \ |
| 5064 | _bfd_x86_elf_hide_symbol |
| 5065 | |
| 5066 | #undef elf64_bed |
| 5067 | #define elf64_bed elf64_x86_64_bed |
| 5068 | |
| 5069 | #include "elf64-target.h" |
| 5070 | |
| 5071 | /* CloudABI support. */ |
| 5072 | |
| 5073 | #undef TARGET_LITTLE_SYM |
| 5074 | #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec |
| 5075 | #undef TARGET_LITTLE_NAME |
| 5076 | #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi" |
| 5077 | |
| 5078 | #undef ELF_OSABI |
| 5079 | #define ELF_OSABI ELFOSABI_CLOUDABI |
| 5080 | |
| 5081 | #undef elf64_bed |
| 5082 | #define elf64_bed elf64_x86_64_cloudabi_bed |
| 5083 | |
| 5084 | #include "elf64-target.h" |
| 5085 | |
| 5086 | /* FreeBSD support. */ |
| 5087 | |
| 5088 | #undef TARGET_LITTLE_SYM |
| 5089 | #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec |
| 5090 | #undef TARGET_LITTLE_NAME |
| 5091 | #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" |
| 5092 | |
| 5093 | #undef ELF_OSABI |
| 5094 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 5095 | |
| 5096 | #undef elf64_bed |
| 5097 | #define elf64_bed elf64_x86_64_fbsd_bed |
| 5098 | |
| 5099 | #include "elf64-target.h" |
| 5100 | |
| 5101 | /* Solaris 2 support. */ |
| 5102 | |
| 5103 | #undef TARGET_LITTLE_SYM |
| 5104 | #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec |
| 5105 | #undef TARGET_LITTLE_NAME |
| 5106 | #define TARGET_LITTLE_NAME "elf64-x86-64-sol2" |
| 5107 | |
| 5108 | static const struct elf_x86_backend_data elf_x86_64_solaris_arch_bed = |
| 5109 | { |
| 5110 | is_solaris /* os */ |
| 5111 | }; |
| 5112 | |
| 5113 | #undef elf_backend_arch_data |
| 5114 | #define elf_backend_arch_data &elf_x86_64_solaris_arch_bed |
| 5115 | |
| 5116 | /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE |
| 5117 | objects won't be recognized. */ |
| 5118 | #undef ELF_OSABI |
| 5119 | |
| 5120 | #undef elf64_bed |
| 5121 | #define elf64_bed elf64_x86_64_sol2_bed |
| 5122 | |
| 5123 | /* The 64-bit static TLS arena size is rounded to the nearest 16-byte |
| 5124 | boundary. */ |
| 5125 | #undef elf_backend_static_tls_alignment |
| 5126 | #define elf_backend_static_tls_alignment 16 |
| 5127 | |
| 5128 | /* The Solaris 2 ABI requires a plt symbol on all platforms. |
| 5129 | |
| 5130 | Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output |
| 5131 | File, p.63. */ |
| 5132 | #undef elf_backend_want_plt_sym |
| 5133 | #define elf_backend_want_plt_sym 1 |
| 5134 | |
| 5135 | #undef elf_backend_strtab_flags |
| 5136 | #define elf_backend_strtab_flags SHF_STRINGS |
| 5137 | |
| 5138 | static bfd_boolean |
| 5139 | elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, |
| 5140 | bfd *obfd ATTRIBUTE_UNUSED, |
| 5141 | const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, |
| 5142 | Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) |
| 5143 | { |
| 5144 | /* PR 19938: FIXME: Need to add code for setting the sh_info |
| 5145 | and sh_link fields of Solaris specific section types. */ |
| 5146 | return FALSE; |
| 5147 | } |
| 5148 | |
| 5149 | #undef elf_backend_copy_special_section_fields |
| 5150 | #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields |
| 5151 | |
| 5152 | #include "elf64-target.h" |
| 5153 | |
| 5154 | /* Native Client support. */ |
| 5155 | |
| 5156 | static bfd_boolean |
| 5157 | elf64_x86_64_nacl_elf_object_p (bfd *abfd) |
| 5158 | { |
| 5159 | /* Set the right machine number for a NaCl x86-64 ELF64 file. */ |
| 5160 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl); |
| 5161 | return TRUE; |
| 5162 | } |
| 5163 | |
| 5164 | #undef TARGET_LITTLE_SYM |
| 5165 | #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec |
| 5166 | #undef TARGET_LITTLE_NAME |
| 5167 | #define TARGET_LITTLE_NAME "elf64-x86-64-nacl" |
| 5168 | #undef elf64_bed |
| 5169 | #define elf64_bed elf64_x86_64_nacl_bed |
| 5170 | |
| 5171 | #undef ELF_MAXPAGESIZE |
| 5172 | #undef ELF_MINPAGESIZE |
| 5173 | #undef ELF_COMMONPAGESIZE |
| 5174 | #define ELF_MAXPAGESIZE 0x10000 |
| 5175 | #define ELF_MINPAGESIZE 0x10000 |
| 5176 | #define ELF_COMMONPAGESIZE 0x10000 |
| 5177 | |
| 5178 | /* Restore defaults. */ |
| 5179 | #undef ELF_OSABI |
| 5180 | #undef elf_backend_static_tls_alignment |
| 5181 | #undef elf_backend_want_plt_sym |
| 5182 | #define elf_backend_want_plt_sym 0 |
| 5183 | #undef elf_backend_strtab_flags |
| 5184 | #undef elf_backend_copy_special_section_fields |
| 5185 | |
| 5186 | /* NaCl uses substantially different PLT entries for the same effects. */ |
| 5187 | |
| 5188 | #undef elf_backend_plt_alignment |
| 5189 | #define elf_backend_plt_alignment 5 |
| 5190 | #define NACL_PLT_ENTRY_SIZE 64 |
| 5191 | #define NACLMASK 0xe0 /* 32-byte alignment mask. */ |
| 5192 | |
| 5193 | static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] = |
| 5194 | { |
| 5195 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 5196 | 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */ |
| 5197 | 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ |
| 5198 | 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ |
| 5199 | 0x41, 0xff, 0xe3, /* jmpq *%r11 */ |
| 5200 | |
| 5201 | /* 9-byte nop sequence to pad out to the next 32-byte boundary. */ |
| 5202 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */ |
| 5203 | |
| 5204 | /* 32 bytes of nop to pad out to the standard size. */ |
| 5205 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ |
| 5206 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5207 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ |
| 5208 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5209 | 0x66, /* excess data16 prefix */ |
| 5210 | 0x90 /* nop */ |
| 5211 | }; |
| 5212 | |
| 5213 | static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = |
| 5214 | { |
| 5215 | 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */ |
| 5216 | 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ |
| 5217 | 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ |
| 5218 | 0x41, 0xff, 0xe3, /* jmpq *%r11 */ |
| 5219 | |
| 5220 | /* 15-byte nop sequence to pad out to the next 32-byte boundary. */ |
| 5221 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ |
| 5222 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5223 | |
| 5224 | /* Lazy GOT entries point here (32-byte aligned). */ |
| 5225 | 0x68, /* pushq immediate */ |
| 5226 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 5227 | 0xe9, /* jmp relative */ |
| 5228 | 0, 0, 0, 0, /* replaced with offset to start of .plt0. */ |
| 5229 | |
| 5230 | /* 22 bytes of nop to pad out to the standard size. */ |
| 5231 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ |
| 5232 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5233 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */ |
| 5234 | }; |
| 5235 | |
| 5236 | /* .eh_frame covering the .plt section. */ |
| 5237 | |
| 5238 | static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] = |
| 5239 | { |
| 5240 | #if (PLT_CIE_LENGTH != 20 \ |
| 5241 | || PLT_FDE_LENGTH != 36 \ |
| 5242 | || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ |
| 5243 | || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) |
| 5244 | # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!" |
| 5245 | #endif |
| 5246 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 5247 | 0, 0, 0, 0, /* CIE ID */ |
| 5248 | 1, /* CIE version */ |
| 5249 | 'z', 'R', 0, /* Augmentation string */ |
| 5250 | 1, /* Code alignment factor */ |
| 5251 | 0x78, /* Data alignment factor */ |
| 5252 | 16, /* Return address column */ |
| 5253 | 1, /* Augmentation size */ |
| 5254 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 5255 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 5256 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 5257 | DW_CFA_nop, DW_CFA_nop, |
| 5258 | |
| 5259 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 5260 | PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */ |
| 5261 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 5262 | 0, 0, 0, 0, /* .plt size goes here */ |
| 5263 | 0, /* Augmentation size */ |
| 5264 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 5265 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 5266 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 5267 | DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ |
| 5268 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 5269 | 13, /* Block length */ |
| 5270 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 5271 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 5272 | DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, |
| 5273 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 5274 | DW_CFA_nop, DW_CFA_nop |
| 5275 | }; |
| 5276 | |
| 5277 | static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt = |
| 5278 | { |
| 5279 | elf_x86_64_nacl_plt0_entry, /* plt0_entry */ |
| 5280 | NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */ |
| 5281 | elf_x86_64_nacl_plt_entry, /* plt_entry */ |
| 5282 | NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 5283 | elf_x86_64_nacl_plt0_entry, /* plt_tlsdesc_entry */ |
| 5284 | NACL_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ |
| 5285 | 2, /* plt_tlsdesc_got1_offset */ |
| 5286 | 9, /* plt_tlsdesc_got2_offset */ |
| 5287 | 6, /* plt_tlsdesc_got1_insn_end */ |
| 5288 | 13, /* plt_tlsdesc_got2_insn_end */ |
| 5289 | 2, /* plt0_got1_offset */ |
| 5290 | 9, /* plt0_got2_offset */ |
| 5291 | 13, /* plt0_got2_insn_end */ |
| 5292 | 3, /* plt_got_offset */ |
| 5293 | 33, /* plt_reloc_offset */ |
| 5294 | 38, /* plt_plt_offset */ |
| 5295 | 7, /* plt_got_insn_size */ |
| 5296 | 42, /* plt_plt_insn_end */ |
| 5297 | 32, /* plt_lazy_offset */ |
| 5298 | elf_x86_64_nacl_plt0_entry, /* pic_plt0_entry */ |
| 5299 | elf_x86_64_nacl_plt_entry, /* pic_plt_entry */ |
| 5300 | elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */ |
| 5301 | sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */ |
| 5302 | }; |
| 5303 | |
| 5304 | static const struct elf_x86_backend_data elf_x86_64_nacl_arch_bed = |
| 5305 | { |
| 5306 | is_nacl /* os */ |
| 5307 | }; |
| 5308 | |
| 5309 | #undef elf_backend_arch_data |
| 5310 | #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed |
| 5311 | |
| 5312 | #undef elf_backend_object_p |
| 5313 | #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p |
| 5314 | #undef elf_backend_modify_segment_map |
| 5315 | #define elf_backend_modify_segment_map nacl_modify_segment_map |
| 5316 | #undef elf_backend_modify_program_headers |
| 5317 | #define elf_backend_modify_program_headers nacl_modify_program_headers |
| 5318 | #undef elf_backend_final_write_processing |
| 5319 | #define elf_backend_final_write_processing nacl_final_write_processing |
| 5320 | |
| 5321 | #include "elf64-target.h" |
| 5322 | |
| 5323 | /* Native Client x32 support. */ |
| 5324 | |
| 5325 | static bfd_boolean |
| 5326 | elf32_x86_64_nacl_elf_object_p (bfd *abfd) |
| 5327 | { |
| 5328 | /* Set the right machine number for a NaCl x86-64 ELF32 file. */ |
| 5329 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl); |
| 5330 | return TRUE; |
| 5331 | } |
| 5332 | |
| 5333 | #undef TARGET_LITTLE_SYM |
| 5334 | #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec |
| 5335 | #undef TARGET_LITTLE_NAME |
| 5336 | #define TARGET_LITTLE_NAME "elf32-x86-64-nacl" |
| 5337 | #undef elf32_bed |
| 5338 | #define elf32_bed elf32_x86_64_nacl_bed |
| 5339 | |
| 5340 | #define bfd_elf32_bfd_reloc_type_lookup \ |
| 5341 | elf_x86_64_reloc_type_lookup |
| 5342 | #define bfd_elf32_bfd_reloc_name_lookup \ |
| 5343 | elf_x86_64_reloc_name_lookup |
| 5344 | #define bfd_elf32_get_synthetic_symtab \ |
| 5345 | elf_x86_64_get_synthetic_symtab |
| 5346 | |
| 5347 | #undef elf_backend_object_p |
| 5348 | #define elf_backend_object_p \ |
| 5349 | elf32_x86_64_nacl_elf_object_p |
| 5350 | |
| 5351 | #undef elf_backend_bfd_from_remote_memory |
| 5352 | #define elf_backend_bfd_from_remote_memory \ |
| 5353 | _bfd_elf32_bfd_from_remote_memory |
| 5354 | |
| 5355 | #undef elf_backend_size_info |
| 5356 | #define elf_backend_size_info \ |
| 5357 | _bfd_elf32_size_info |
| 5358 | |
| 5359 | #undef elf32_bed |
| 5360 | #define elf32_bed elf32_x86_64_bed |
| 5361 | |
| 5362 | #include "elf32-target.h" |
| 5363 | |
| 5364 | /* Restore defaults. */ |
| 5365 | #undef elf_backend_object_p |
| 5366 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 5367 | #undef elf_backend_bfd_from_remote_memory |
| 5368 | #undef elf_backend_size_info |
| 5369 | #undef elf_backend_modify_segment_map |
| 5370 | #undef elf_backend_modify_program_headers |
| 5371 | #undef elf_backend_final_write_processing |
| 5372 | |
| 5373 | /* Intel L1OM support. */ |
| 5374 | |
| 5375 | static bfd_boolean |
| 5376 | elf64_l1om_elf_object_p (bfd *abfd) |
| 5377 | { |
| 5378 | /* Set the right machine number for an L1OM elf64 file. */ |
| 5379 | bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om); |
| 5380 | return TRUE; |
| 5381 | } |
| 5382 | |
| 5383 | #undef TARGET_LITTLE_SYM |
| 5384 | #define TARGET_LITTLE_SYM l1om_elf64_vec |
| 5385 | #undef TARGET_LITTLE_NAME |
| 5386 | #define TARGET_LITTLE_NAME "elf64-l1om" |
| 5387 | #undef ELF_ARCH |
| 5388 | #define ELF_ARCH bfd_arch_l1om |
| 5389 | |
| 5390 | #undef ELF_MACHINE_CODE |
| 5391 | #define ELF_MACHINE_CODE EM_L1OM |
| 5392 | |
| 5393 | #undef ELF_OSABI |
| 5394 | |
| 5395 | #undef elf64_bed |
| 5396 | #define elf64_bed elf64_l1om_bed |
| 5397 | |
| 5398 | #undef elf_backend_object_p |
| 5399 | #define elf_backend_object_p elf64_l1om_elf_object_p |
| 5400 | |
| 5401 | /* Restore defaults. */ |
| 5402 | #undef ELF_MAXPAGESIZE |
| 5403 | #undef ELF_MINPAGESIZE |
| 5404 | #undef ELF_COMMONPAGESIZE |
| 5405 | #if DEFAULT_LD_Z_SEPARATE_CODE |
| 5406 | # define ELF_MAXPAGESIZE 0x1000 |
| 5407 | #else |
| 5408 | # define ELF_MAXPAGESIZE 0x200000 |
| 5409 | #endif |
| 5410 | #define ELF_MINPAGESIZE 0x1000 |
| 5411 | #define ELF_COMMONPAGESIZE 0x1000 |
| 5412 | #undef elf_backend_plt_alignment |
| 5413 | #define elf_backend_plt_alignment 4 |
| 5414 | #undef elf_backend_arch_data |
| 5415 | #define elf_backend_arch_data &elf_x86_64_arch_bed |
| 5416 | |
| 5417 | #include "elf64-target.h" |
| 5418 | |
| 5419 | /* FreeBSD L1OM support. */ |
| 5420 | |
| 5421 | #undef TARGET_LITTLE_SYM |
| 5422 | #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec |
| 5423 | #undef TARGET_LITTLE_NAME |
| 5424 | #define TARGET_LITTLE_NAME "elf64-l1om-freebsd" |
| 5425 | |
| 5426 | #undef ELF_OSABI |
| 5427 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 5428 | |
| 5429 | #undef elf64_bed |
| 5430 | #define elf64_bed elf64_l1om_fbsd_bed |
| 5431 | |
| 5432 | #include "elf64-target.h" |
| 5433 | |
| 5434 | /* Intel K1OM support. */ |
| 5435 | |
| 5436 | static bfd_boolean |
| 5437 | elf64_k1om_elf_object_p (bfd *abfd) |
| 5438 | { |
| 5439 | /* Set the right machine number for an K1OM elf64 file. */ |
| 5440 | bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om); |
| 5441 | return TRUE; |
| 5442 | } |
| 5443 | |
| 5444 | #undef TARGET_LITTLE_SYM |
| 5445 | #define TARGET_LITTLE_SYM k1om_elf64_vec |
| 5446 | #undef TARGET_LITTLE_NAME |
| 5447 | #define TARGET_LITTLE_NAME "elf64-k1om" |
| 5448 | #undef ELF_ARCH |
| 5449 | #define ELF_ARCH bfd_arch_k1om |
| 5450 | |
| 5451 | #undef ELF_MACHINE_CODE |
| 5452 | #define ELF_MACHINE_CODE EM_K1OM |
| 5453 | |
| 5454 | #undef ELF_OSABI |
| 5455 | |
| 5456 | #undef elf64_bed |
| 5457 | #define elf64_bed elf64_k1om_bed |
| 5458 | |
| 5459 | #undef elf_backend_object_p |
| 5460 | #define elf_backend_object_p elf64_k1om_elf_object_p |
| 5461 | |
| 5462 | #undef elf_backend_static_tls_alignment |
| 5463 | |
| 5464 | #undef elf_backend_want_plt_sym |
| 5465 | #define elf_backend_want_plt_sym 0 |
| 5466 | |
| 5467 | #include "elf64-target.h" |
| 5468 | |
| 5469 | /* FreeBSD K1OM support. */ |
| 5470 | |
| 5471 | #undef TARGET_LITTLE_SYM |
| 5472 | #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec |
| 5473 | #undef TARGET_LITTLE_NAME |
| 5474 | #define TARGET_LITTLE_NAME "elf64-k1om-freebsd" |
| 5475 | |
| 5476 | #undef ELF_OSABI |
| 5477 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 5478 | |
| 5479 | #undef elf64_bed |
| 5480 | #define elf64_bed elf64_k1om_fbsd_bed |
| 5481 | |
| 5482 | #include "elf64-target.h" |
| 5483 | |
| 5484 | /* 32bit x86-64 support. */ |
| 5485 | |
| 5486 | #undef TARGET_LITTLE_SYM |
| 5487 | #define TARGET_LITTLE_SYM x86_64_elf32_vec |
| 5488 | #undef TARGET_LITTLE_NAME |
| 5489 | #define TARGET_LITTLE_NAME "elf32-x86-64" |
| 5490 | #undef elf32_bed |
| 5491 | |
| 5492 | #undef ELF_ARCH |
| 5493 | #define ELF_ARCH bfd_arch_i386 |
| 5494 | |
| 5495 | #undef ELF_MACHINE_CODE |
| 5496 | #define ELF_MACHINE_CODE EM_X86_64 |
| 5497 | |
| 5498 | #undef ELF_OSABI |
| 5499 | |
| 5500 | #undef elf_backend_object_p |
| 5501 | #define elf_backend_object_p \ |
| 5502 | elf32_x86_64_elf_object_p |
| 5503 | |
| 5504 | #undef elf_backend_bfd_from_remote_memory |
| 5505 | #define elf_backend_bfd_from_remote_memory \ |
| 5506 | _bfd_elf32_bfd_from_remote_memory |
| 5507 | |
| 5508 | #undef elf_backend_size_info |
| 5509 | #define elf_backend_size_info \ |
| 5510 | _bfd_elf32_size_info |
| 5511 | |
| 5512 | #include "elf32-target.h" |