1 /* $OpenBSD: rtld_machine.c,v 1.20 2013/06/13 04:13:47 brad Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Dale Rahn 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #define _DYN_LOADER 30 #define LDSO_ARCH_IS_RELA_ 31 32 #include <sys/types.h> 33 #include <sys/mman.h> 34 35 #include <nlist.h> 36 #include <link.h> 37 #include <signal.h> 38 39 #include "syscall.h" 40 #include "archdep.h" 41 #include "resolve.h" 42 43 void _dl_bind_start(void); /* XXX */ 44 Elf_Addr _dl_bind(elf_object_t *object, int reloff); 45 #define _RF_S 0x80000000 /* Resolve symbol */ 46 #define _RF_A 0x40000000 /* Use addend */ 47 #define _RF_P 0x20000000 /* Location relative */ 48 #define _RF_G 0x10000000 /* GOT offset */ 49 #define _RF_B 0x08000000 /* Load address relative */ 50 #define _RF_U 0x04000000 /* Unaligned */ 51 #define _RF_E 0x02000000 /* ERROR */ 52 #define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ 53 #define _RF_RS(s) ((s) & 0xff) /* right shift */ 54 static int reloc_target_flags[] = { 55 0, /* 0 R_SH_NONE */ 56 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 1 R_SH_DIR32 */ 57 _RF_S|_RF_P|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 2 REL32 */ 58 _RF_E, /* 3 R_SH_DIR8WPN */ 59 _RF_E, /* 4 R_SH_IND12W */ 60 _RF_E, /* 5 R_SH_DIR8WPL */ 61 _RF_E, /* 6 R_SH_DIR8WPZ */ 62 _RF_E, /* 7 R_SH_DIR8BP */ 63 _RF_E, /* 8 R_SH_DIR8W */ 64 _RF_E, /* 9 R_SH_DIR8L */ 65 _RF_E, /* 10 R_SH_LOOP_START */ 66 _RF_E, /* 11 R_SH_LOOP_END */ 67 _RF_E, /* 12 Unused */ 68 _RF_E, /* 13 Unused */ 69 _RF_E, /* 14 Unused */ 70 _RF_E, /* 15 Unused */ 71 _RF_E, /* 16 Unused */ 72 _RF_E, /* 17 Unused */ 73 _RF_E, /* 18 Unused */ 74 _RF_E, /* 19 Unused */ 75 _RF_E, /* 20 Unused */ 76 _RF_E, /* 21 Unused */ 77 _RF_E, /* 22 R_SH_GNU_VTINHERIT */ 78 _RF_E, /* 23 R_SH_GNU_VTENTRY */ 79 _RF_E, /* 24 R_SH_SWITCH8 */ 80 _RF_E, /* 25 R_SH_SWITCH16 */ 81 _RF_E, /* 26 R_SH_SWITCH32 */ 82 _RF_E, /* 27 R_SH_USES */ 83 _RF_E, /* 28 R_SH_COUNT */ 84 _RF_E, /* 29 R_SH_ALIGN */ 85 _RF_E, /* 30 R_SH_CODE */ 86 _RF_E, /* 31 R_SH_DATA */ 87 _RF_E, /* 32 R_SH_LABEL */ 88 _RF_E, /* 33 R_SH_DIR16 */ 89 _RF_E, /* 34 R_SH_DIR8 */ 90 _RF_E, /* 35 R_SH_DIR8UL */ 91 _RF_E, /* 36 R_SH_DIR8UW */ 92 _RF_E, /* 37 R_SH_DIR8U */ 93 _RF_E, /* 38 R_SH_DIR8SW */ 94 _RF_E, /* 39 R_SH_DIR8S */ 95 _RF_E, /* 40 R_SH_DIR4UL */ 96 _RF_E, /* 41 R_SH_DIR4UW */ 97 _RF_E, /* 42 R_SH_DIR4U */ 98 _RF_E, /* 43 R_SH_PSHA */ 99 _RF_E, /* 44 R_SH_PSHL */ 100 _RF_E, /* 45 R_SH_DIR5U */ 101 _RF_E, /* 46 R_SH_DIR6U */ 102 _RF_E, /* 47 R_SH_DIR6S */ 103 _RF_E, /* 48 R_SH_DIR10S */ 104 _RF_E, /* 49 R_SH_DIR10SW */ 105 _RF_E, /* 50 R_SH_DIR10SL */ 106 _RF_E, /* 51 R_SH_DIR10SQ */ 107 _RF_E, /* 52 XXXX */ 108 _RF_E, /* 53 R_SH_DIR16S */ 109 _RF_E, /* 54 Unused */ 110 _RF_E, /* 55 Unused */ 111 _RF_E, /* 56 Unused */ 112 _RF_E, /* 57 Unused */ 113 _RF_E, /* 58 Unused */ 114 _RF_E, /* 59 Unused */ 115 _RF_E, /* 60 Unused */ 116 _RF_E, /* 61 Unused */ 117 _RF_E, /* 62 Unused */ 118 _RF_E, /* 63 Unused */ 119 _RF_E, /* 64 Unused */ 120 _RF_E, /* 65 Unused */ 121 _RF_E, /* 66 Unused */ 122 _RF_E, /* 67 Unused */ 123 _RF_E, /* 68 Unused */ 124 _RF_E, /* 69 Unused */ 125 _RF_E, /* 70 Unused */ 126 _RF_E, /* 71 Unused */ 127 _RF_E, /* 72 Unused */ 128 _RF_E, /* 73 Unused */ 129 _RF_E, /* 74 Unused */ 130 _RF_E, /* 75 Unused */ 131 _RF_E, /* 76 Unused */ 132 _RF_E, /* 77 Unused */ 133 _RF_E, /* 78 Unused */ 134 _RF_E, /* 79 Unused */ 135 _RF_E, /* 80 Unused */ 136 _RF_E, /* 81 Unused */ 137 _RF_E, /* 82 Unused */ 138 _RF_E, /* 83 Unused */ 139 _RF_E, /* 84 Unused */ 140 _RF_E, /* 85 Unused */ 141 _RF_E, /* 86 Unused */ 142 _RF_E, /* 87 Unused */ 143 _RF_E, /* 88 Unused */ 144 _RF_E, /* 89 Unused */ 145 _RF_E, /* 90 Unused */ 146 _RF_E, /* 91 Unused */ 147 _RF_E, /* 92 Unused */ 148 _RF_E, /* 93 Unused */ 149 _RF_E, /* 94 Unused */ 150 _RF_E, /* 95 Unused */ 151 _RF_E, /* 96 Unused */ 152 _RF_E, /* 97 Unused */ 153 _RF_E, /* 98 Unused */ 154 _RF_E, /* 99 Unused */ 155 _RF_E, /* 100 Unused */ 156 _RF_E, /* 101 Unused */ 157 _RF_E, /* 102 Unused */ 158 _RF_E, /* 103 Unused */ 159 _RF_E, /* 104 Unused */ 160 _RF_E, /* 105 Unused */ 161 _RF_E, /* 106 Unused */ 162 _RF_E, /* 107 Unused */ 163 _RF_E, /* 108 Unused */ 164 _RF_E, /* 109 Unused */ 165 _RF_E, /* 110 Unused */ 166 _RF_E, /* 111 Unused */ 167 _RF_E, /* 112 Unused */ 168 _RF_E, /* 113 Unused */ 169 _RF_E, /* 114 Unused */ 170 _RF_E, /* 115 Unused */ 171 _RF_E, /* 116 Unused */ 172 _RF_E, /* 117 Unused */ 173 _RF_E, /* 118 Unused */ 174 _RF_E, /* 119 Unused */ 175 _RF_E, /* 120 Unused */ 176 _RF_E, /* 121 Unused */ 177 _RF_E, /* 122 Unused */ 178 _RF_E, /* 123 Unused */ 179 _RF_E, /* 124 Unused */ 180 _RF_E, /* 125 Unused */ 181 _RF_E, /* 126 Unused */ 182 _RF_E, /* 127 Unused */ 183 _RF_E, /* 128 Unused */ 184 _RF_E, /* 129 Unused */ 185 _RF_E, /* 130 Unused */ 186 _RF_E, /* 131 Unused */ 187 _RF_E, /* 132 Unused */ 188 _RF_E, /* 133 Unused */ 189 _RF_E, /* 134 Unused */ 190 _RF_E, /* 135 Unused */ 191 _RF_E, /* 136 Unused */ 192 _RF_E, /* 137 Unused */ 193 _RF_E, /* 138 Unused */ 194 _RF_E, /* 139 Unused */ 195 _RF_E, /* 140 Unused */ 196 _RF_E, /* 141 Unused */ 197 _RF_E, /* 142 Unused */ 198 _RF_E, /* 143 Unused */ 199 _RF_E, /* 144 R_SH_TLS_GD_32 */ 200 _RF_E, /* 145 R_SH_TLS_LD_32 */ 201 _RF_E, /* 146 R_SH_TLS_LDO_32 */ 202 _RF_E, /* 147 R_SH_TLS_IE_32 */ 203 _RF_E, /* 148 R_SH_TLS_LE_32 */ 204 _RF_E, /* 149 R_SH_TLS_DTPMOD32 */ 205 _RF_E, /* 150 R_SH_TLS_DTPOFF32 */ 206 _RF_E, /* 151 R_SH_TLS_TPOFF32 */ 207 _RF_E, /* 152 Unused */ 208 _RF_E, /* 153 Unused */ 209 _RF_E, /* 154 Unused */ 210 _RF_E, /* 155 Unused */ 211 _RF_E, /* 156 Unused */ 212 _RF_E, /* 157 Unused */ 213 _RF_E, /* 158 Unused */ 214 _RF_E, /* 159 Unused */ 215 _RF_E, /* 160 R_SH_GOT32 */ 216 _RF_E, /* 161 R_SH_PLT32 */ 217 _RF_S| _RF_SZ(32) | _RF_RS(0), /* 162 COPY */ 218 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 163 GLOB_DAT */ 219 _RF_S| _RF_SZ(32) | _RF_RS(0), /* 164 JMP_SLOT */ 220 _RF_A| _RF_B| _RF_SZ(32) | _RF_RS(0), /* 165 RELATIVE */ 221 _RF_E, /* 166 R_SH_GOTOFF */ 222 _RF_E, /* 167 R_SH_GOTPC */ 223 _RF_E, /* 168 R_SH_GOTPLT32 */ 224 _RF_E, /* 169 R_SH_GOT_LOW16 */ 225 _RF_E, /* 170 R_SH_GOT_MEDLOW16 */ 226 _RF_E, /* 171 R_SH_GOT_MEDHI16 */ 227 _RF_E, /* 172 R_SH_GOT_HI16 */ 228 _RF_E, /* 173 R_SH_GOTPLT_LOW16 */ 229 _RF_E, /* 174 R_SH_GOTPLT_MEDLOW16 */ 230 _RF_E, /* 175 R_SH_GOTPLT_MEDHI16 */ 231 _RF_E, /* 176 R_SH_GOTPLT_HI16 */ 232 _RF_E, /* 177 R_SH_PLT_LOW16 */ 233 _RF_E, /* 178 R_SH_PLT_MEDLOW16 */ 234 _RF_E, /* 179 R_SH_PLT_MEDHI16 */ 235 _RF_E, /* 180 R_SH_PLT_HI16 */ 236 _RF_E, /* 181 R_SH_GOTOFF_LOW16 */ 237 _RF_E, /* 182 R_SH_GOTOFF_MEDLOW16 */ 238 _RF_E, /* 183 R_SH_GOTOFF_MEDHI16 */ 239 _RF_E, /* 184 R_SH_GOTOFF_HI16 */ 240 _RF_E, /* 185 R_SH_GOTPC_LOW16 */ 241 _RF_E, /* 186 R_SH_GOTPC_MEDLOW16 */ 242 _RF_E, /* 187 R_SH_GOTPC_MEDHI16 */ 243 _RF_E, /* 188 R_SH_GOTPC_HI16 */ 244 _RF_E, /* 189 R_SH_GOT10BY4 */ 245 _RF_E, /* 190 R_SH_GOTPLT10BY4 */ 246 _RF_E, /* 191 R_SH_GOT10BY8 */ 247 _RF_E, /* 192 R_SH_GOTPLT10BY8 */ 248 #ifdef SH_SUPPORT_64_BIT 249 _RF_E, /* 193 R_SH_COPY64 */ 250 _RF_E, /* 194 R_SH_GLOB_DAT64 */ 251 _RF_E, /* 195 R_SH_JMP_SLOT64 */ 252 _RF_E, /* 196 R_SH_RELATIVE64 */ 253 _RF_E, /* 197 Unused */ 254 _RF_E, /* 198 Unused */ 255 _RF_E, /* 199 Unused */ 256 _RF_E, /* 200 Unused */ 257 _RF_E, /* 201 Unused */ 258 _RF_E, /* 202 Unused */ 259 _RF_E, /* 203 Unused */ 260 _RF_E, /* 204 Unused */ 261 _RF_E, /* 205 Unused */ 262 _RF_E, /* 206 Unused */ 263 _RF_E, /* 207 Unused */ 264 _RF_E, /* 208 Unused */ 265 _RF_E, /* 209 Unused */ 266 _RF_E, /* 210 Unused */ 267 _RF_E, /* 211 Unused */ 268 _RF_E, /* 212 Unused */ 269 _RF_E, /* 213 Unused */ 270 _RF_E, /* 214 Unused */ 271 _RF_E, /* 215 Unused */ 272 _RF_E, /* 216 Unused */ 273 _RF_E, /* 217 Unused */ 274 _RF_E, /* 218 Unused */ 275 _RF_E, /* 219 Unused */ 276 _RF_E, /* 220 Unused */ 277 _RF_E, /* 221 Unused */ 278 _RF_E, /* 222 Unused */ 279 _RF_E, /* 223 Unused */ 280 _RF_E, /* 224 Unused */ 281 _RF_E, /* 225 Unused */ 282 _RF_E, /* 226 Unused */ 283 _RF_E, /* 227 Unused */ 284 _RF_E, /* 228 Unused */ 285 _RF_E, /* 229 Unused */ 286 _RF_E, /* 230 Unused */ 287 _RF_E, /* 231 Unused */ 288 _RF_E, /* 232 Unused */ 289 _RF_E, /* 233 Unused */ 290 _RF_E, /* 234 Unused */ 291 _RF_E, /* 235 Unused */ 292 _RF_E, /* 236 Unused */ 293 _RF_E, /* 237 Unused */ 294 _RF_E, /* 238 Unused */ 295 _RF_E, /* 239 Unused */ 296 _RF_E, /* 240 Unused */ 297 _RF_E, /* 241 Unused */ 298 _RF_E, /* 242 R_SH_SHMEDIA_CODE */ 299 _RF_E, /* 243 R_SH_PT_16 */ 300 _RF_E, /* 244 R_SH_IMMS16 */ 301 _RF_E, /* 245 R_SH_IMMU16 */ 302 _RF_E, /* 246 R_SH_IMM_LOW16 */ 303 _RF_E, /* 247 R_SH_IMM_LOW16_PCREL */ 304 _RF_E, /* 248 R_SH_IMM_MEDLOW16 */ 305 _RF_E, /* 249 R_SH_IMM_MEDLOW16_PCREL */ 306 _RF_E, /* 250 R_SH_IMM_MEDHI16 */ 307 _RF_E, /* 251 R_SH_IMM_MEDHI16_PCREL */ 308 _RF_E, /* 252 R_SH_IMM_HI16 */ 309 _RF_E, /* 253 R_SH_IMM_HI16_PCREL */ 310 _RF_E, /* 254 R_SH_64 */ 311 _RF_E, /* 255 R_SH_64_PCREL */ 312 0 313 #endif 314 }; 315 316 #define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0) 317 #define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0) 318 #define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0) 319 #define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0) 320 #define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0) 321 #define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) 322 #define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) 323 static int reloc_target_bitmask[] = { 324 #define _BM(x) (x == 32? ~0 : ~(-(1UL << (x)))) 325 _BM(0), /* 0 R_SH_NONE */ 326 _BM(32), /* 1 R_SH_DIR32 */ 327 _BM(32), /* 2 R_SH_REL32 */ 328 _BM(8), /* 3 R_SH_DIR8WPN */ 329 _BM(12), /* 4 R_SH_IND12W */ 330 _BM(8), /* 5 R_SH_DIR8WPL */ 331 _BM(8), /* 6 R_SH_DIR8WPZ */ 332 _BM(8), /* 7 R_SH_DIR8BP */ 333 _BM(8), /* 8 R_SH_DIR8W */ 334 _BM(8), /* 9 R_SH_DIR8L */ 335 _BM(0), /* 10 R_SH_LOOP_START */ 336 _BM(0), /* 11 R_SH_LOOP_END */ 337 _BM(0), /* 12 Unused */ 338 _BM(0), /* 13 Unused */ 339 _BM(0), /* 14 Unused */ 340 _BM(0), /* 15 Unused */ 341 _BM(0), /* 16 Unused */ 342 _BM(0), /* 17 Unused */ 343 _BM(0), /* 18 Unused */ 344 _BM(0), /* 19 Unused */ 345 _BM(0), /* 20 Unused */ 346 _BM(0), /* 21 Unused */ 347 _BM(0), /* 22 R_SH_GNU_VTINHERIT */ 348 _BM(0), /* 23 R_SH_GNU_VTENTRY */ 349 _BM(0), /* 24 R_SH_SWITCH8 */ 350 _BM(0), /* 25 R_SH_SWITCH16 */ 351 _BM(0), /* 26 R_SH_SWITCH32 */ 352 _BM(0), /* 27 R_SH_USES */ 353 _BM(0), /* 28 R_SH_COUNT */ 354 _BM(0), /* 29 R_SH_ALIGN */ 355 _BM(0), /* 30 R_SH_CODE */ 356 _BM(0), /* 31 R_SH_DATA */ 357 _BM(0), /* 32 R_SH_LABEL */ 358 _BM(0), /* 33 R_SH_DIR16 */ 359 _BM(0), /* 34 R_SH_DIR8 */ 360 _BM(0), /* 35 R_SH_DIR8UL */ 361 _BM(0), /* 36 R_SH_DIR8UW */ 362 _BM(0), /* 37 R_SH_DIR8U */ 363 _BM(0), /* 38 R_SH_DIR8SW */ 364 _BM(0), /* 39 R_SH_DIR8S */ 365 _BM(0), /* 40 R_SH_DIR4UL */ 366 _BM(0), /* 41 R_SH_DIR4UW */ 367 _BM(0), /* 42 R_SH_DIR4U */ 368 _BM(0), /* 43 R_SH_PSHA */ 369 _BM(0), /* 44 R_SH_PSHL */ 370 _BM(0), /* 45 R_SH_DIR5U */ 371 _BM(0), /* 46 R_SH_DIR6U */ 372 _BM(0), /* 47 R_SH_DIR6S */ 373 _BM(0), /* 48 R_SH_DIR10S */ 374 _BM(0), /* 49 R_SH_DIR10SW */ 375 _BM(0), /* 50 R_SH_DIR10SL */ 376 _BM(0), /* 51 R_SH_DIR10SQ */ 377 _BM(0), /* 52 xxx */ 378 _BM(0), /* 53 R_SH_DIR16S */ 379 _BM(0), /* 54 Unused */ 380 _BM(0), /* 55 Unused */ 381 _BM(0), /* 56 Unused */ 382 _BM(0), /* 57 Unused */ 383 _BM(0), /* 58 Unused */ 384 _BM(0), /* 59 Unused */ 385 _BM(0), /* 60 Unused */ 386 _BM(0), /* 61 Unused */ 387 _BM(0), /* 62 Unused */ 388 _BM(0), /* 63 Unused */ 389 _BM(0), /* 64 Unused */ 390 _BM(0), /* 65 Unused */ 391 _BM(0), /* 66 Unused */ 392 _BM(0), /* 67 Unused */ 393 _BM(0), /* 68 Unused */ 394 _BM(0), /* 69 Unused */ 395 _BM(0), /* 70 Unused */ 396 _BM(0), /* 71 Unused */ 397 _BM(0), /* 72 Unused */ 398 _BM(0), /* 73 Unused */ 399 _BM(0), /* 74 Unused */ 400 _BM(0), /* 75 Unused */ 401 _BM(0), /* 76 Unused */ 402 _BM(0), /* 77 Unused */ 403 _BM(0), /* 78 Unused */ 404 _BM(0), /* 79 Unused */ 405 _BM(0), /* 80 Unused */ 406 _BM(0), /* 81 Unused */ 407 _BM(0), /* 82 Unused */ 408 _BM(0), /* 83 Unused */ 409 _BM(0), /* 84 Unused */ 410 _BM(0), /* 85 Unused */ 411 _BM(0), /* 86 Unused */ 412 _BM(0), /* 87 Unused */ 413 _BM(0), /* 88 Unused */ 414 _BM(0), /* 89 Unused */ 415 _BM(0), /* 90 Unused */ 416 _BM(0), /* 91 Unused */ 417 _BM(0), /* 92 Unused */ 418 _BM(0), /* 93 Unused */ 419 _BM(0), /* 94 Unused */ 420 _BM(0), /* 95 Unused */ 421 _BM(0), /* 96 Unused */ 422 _BM(0), /* 97 Unused */ 423 _BM(0), /* 98 Unused */ 424 _BM(0), /* 99 Unused */ 425 _BM(0), /* 100 Unused */ 426 _BM(0), /* 101 Unused */ 427 _BM(0), /* 102 Unused */ 428 _BM(0), /* 103 Unused */ 429 _BM(0), /* 104 Unused */ 430 _BM(0), /* 105 Unused */ 431 _BM(0), /* 106 Unused */ 432 _BM(0), /* 107 Unused */ 433 _BM(0), /* 108 Unused */ 434 _BM(0), /* 109 Unused */ 435 _BM(0), /* 110 Unused */ 436 _BM(0), /* 111 Unused */ 437 _BM(0), /* 112 Unused */ 438 _BM(0), /* 113 Unused */ 439 _BM(0), /* 114 Unused */ 440 _BM(0), /* 115 Unused */ 441 _BM(0), /* 116 Unused */ 442 _BM(0), /* 117 Unused */ 443 _BM(0), /* 118 Unused */ 444 _BM(0), /* 119 Unused */ 445 _BM(0), /* 120 Unused */ 446 _BM(0), /* 121 Unused */ 447 _BM(0), /* 122 Unused */ 448 _BM(0), /* 123 Unused */ 449 _BM(0), /* 124 Unused */ 450 _BM(0), /* 125 Unused */ 451 _BM(0), /* 126 Unused */ 452 _BM(0), /* 127 Unused */ 453 _BM(0), /* 128 Unused */ 454 _BM(0), /* 129 Unused */ 455 _BM(0), /* 130 Unused */ 456 _BM(0), /* 131 Unused */ 457 _BM(0), /* 132 Unused */ 458 _BM(0), /* 133 Unused */ 459 _BM(0), /* 134 Unused */ 460 _BM(0), /* 135 Unused */ 461 _BM(0), /* 136 Unused */ 462 _BM(0), /* 137 Unused */ 463 _BM(0), /* 138 Unused */ 464 _BM(0), /* 139 Unused */ 465 _BM(0), /* 140 Unused */ 466 _BM(0), /* 141 Unused */ 467 _BM(0), /* 142 Unused */ 468 _BM(0), /* 143 Unused */ 469 _BM(0), /* 144 R_SH_TLS_GD_32 */ 470 _BM(0), /* 145 R_SH_TLS_LD_32 */ 471 _BM(0), /* 146 R_SH_TLS_LDO_32 */ 472 _BM(0), /* 147 R_SH_TLS_IE_32 */ 473 _BM(0), /* 148 R_SH_TLS_LE_32 */ 474 _BM(0), /* 149 R_SH_TLS_DTPMOD32 */ 475 _BM(0), /* 150 R_SH_TLS_DTPOFF32 */ 476 _BM(0), /* 151 R_SH_TLS_TPOFF32 */ 477 _BM(0), /* 152 xxx */ 478 _BM(0), /* 153 xxx */ 479 _BM(0), /* 154 xxx */ 480 _BM(0), /* 155 xxx */ 481 _BM(0), /* 156 xxx */ 482 _BM(0), /* 157 xxx */ 483 _BM(0), /* 158 xxx */ 484 _BM(0), /* 159 xxx */ 485 _BM(0), /* 160 R_SH_GOT32 */ 486 _BM(0), /* 161 R_SH_PLT32 */ 487 _BM(0), /* 162 R_SH_COPY */ 488 _BM(32), /* 163 R_SH_GLOB_DAT */ 489 _BM(0), /* 164 R_SH_JMP_SLOT */ 490 _BM(32), /* 165 R_SH_RELATIVE */ 491 _BM(0), /* 166 R_SH_GOTOFF */ 492 _BM(0), /* 167 R_SH_GOTPC */ 493 _BM(0), /* 168 R_SH_GOTPLT32 */ 494 _BM(0), /* 169 R_SH_GOT_LOW16 */ 495 _BM(0), /* 170 R_SH_GOT_MEDLOW16 */ 496 _BM(0), /* 171 R_SH_GOT_MEDHI16 */ 497 _BM(0), /* 172 R_SH_GOT_HI16 */ 498 _BM(0), /* 173 R_SH_GOTPLT_LOW16 */ 499 _BM(0), /* 174 R_SH_GOTPLT_MEDLOW16 */ 500 _BM(0), /* 175 R_SH_GOTPLT_MEDHI16 */ 501 _BM(0), /* 176 R_SH_GOTPLT_HI16 */ 502 _BM(0), /* 177 R_SH_PLT_LOW16 */ 503 _BM(0), /* 178 R_SH_PLT_MEDLOW16 */ 504 _BM(0), /* 179 R_SH_PLT_MEDHI16 */ 505 _BM(0), /* 180 R_SH_PLT_HI16 */ 506 _BM(0), /* 181 R_SH_GOTOFF_LOW16 */ 507 _BM(0), /* 182 R_SH_GOTOFF_MEDLOW16 */ 508 _BM(0), /* 183 R_SH_GOTOFF_MEDHI16 */ 509 _BM(0), /* 184 R_SH_GOTOFF_HI16 */ 510 _BM(0), /* 185 R_SH_GOTPC_LOW16 */ 511 _BM(0), /* 186 R_SH_GOTPC_MEDLOW16 */ 512 _BM(0), /* 187 R_SH_GOTPC_MEDHI16 */ 513 _BM(0), /* 188 R_SH_GOTPC_HI16 */ 514 _BM(0), /* 189 R_SH_GOT10BY4 */ 515 _BM(0), /* 190 R_SH_GOTPLT10BY4 */ 516 _BM(0), /* 191 R_SH_GOT10BY8 */ 517 _BM(0), /* 192 R_SH_GOTPLT10BY8 */ 518 #ifdef SH_SUPPORT_64_BIT 519 _BM(0), /* 193 R_SH_COPY64 */ 520 _BM(0), /* 194 R_SH_GLOB_DAT64 */ 521 _BM(0), /* 195 R_SH_JMP_SLOT64 */ 522 _BM(0), /* 196 R_SH_RELATIVE64 */ 523 _BM(0), /* 197 xxx */ 524 _BM(0), /* 198 xxx */ 525 _BM(0), /* 199 xxx */ 526 _BM(0), /* 200 xxx */ 527 _BM(0), /* 201 xxx */ 528 _BM(0), /* 202 xxx */ 529 _BM(0), /* 203 xxx */ 530 _BM(0), /* 204 xxx */ 531 _BM(0), /* 205 xxx */ 532 _BM(0), /* 206 xxx */ 533 _BM(0), /* 207 xxx */ 534 _BM(0), /* 208 xxx */ 535 _BM(0), /* 209 xxx */ 536 _BM(0), /* 210 xxx */ 537 _BM(0), /* 211 xxx */ 538 _BM(0), /* 212 xxx */ 539 _BM(0), /* 213 xxx */ 540 _BM(0), /* 214 xxx */ 541 _BM(0), /* 215 xxx */ 542 _BM(0), /* 216 xxx */ 543 _BM(0), /* 217 xxx */ 544 _BM(0), /* 218 xxx */ 545 _BM(0), /* 219 xxx */ 546 _BM(0), /* 220 xxx */ 547 _BM(0), /* 221 xxx */ 548 _BM(0), /* 222 xxx */ 549 _BM(0), /* 223 xxx */ 550 _BM(0), /* 224 xxx */ 551 _BM(0), /* 225 xxx */ 552 _BM(0), /* 226 xxx */ 553 _BM(0), /* 227 xxx */ 554 _BM(0), /* 228 xxx */ 555 _BM(0), /* 229 xxx */ 556 _BM(0), /* 230 xxx */ 557 _BM(0), /* 231 xxx */ 558 _BM(0), /* 232 xxx */ 559 _BM(0), /* 233 xxx */ 560 _BM(0), /* 234 xxx */ 561 _BM(0), /* 235 xxx */ 562 _BM(0), /* 236 xxx */ 563 _BM(0), /* 237 xxx */ 564 _BM(0), /* 238 xxx */ 565 _BM(0), /* 239 xxx */ 566 _BM(0), /* 240 xxx */ 567 _BM(0), /* 241 xxx */ 568 _BM(0), /* 242 R_SH_SHMEDIA_CODE */ 569 _BM(0), /* 243 R_SH_PT_16 */ 570 _BM(0), /* 244 R_SH_IMMS16 */ 571 _BM(0), /* 245 R_SH_IMMU16 */ 572 _BM(0), /* 246 R_SH_IMM_LOW16 */ 573 _BM(0), /* 247 R_SH_IMM_LOW16_PCREL */ 574 _BM(0), /* 248 R_SH_IMM_MEDLOW16 */ 575 _BM(0), /* 249 R_SH_IMM_MEDLOW16_PCREL */ 576 _BM(0), /* 250 R_SH_IMM_MEDHI16 */ 577 _BM(0), /* 251 R_SH_IMM_MEDHI16_PCREL */ 578 _BM(0), /* 252 R_SH_IMM_HI16 */ 579 _BM(0), /* 253 R_SH_IMM_HI16_PCREL */ 580 _BM(0), /* 254 R_SH_64 */ 581 _BM(0), /* 255 R_SH_64_PCREL */ 582 #endif 583 #undef _BM 584 }; 585 #define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) 586 587 #define R_TYPE(x) R_SH_ ## x 588 589 void _dl_reloc_plt(Elf_Word *where, Elf_Addr value, Elf_RelA *rel); 590 591 void 592 _dl_reloc_plt(Elf_Word *where, Elf_Addr value, Elf_RelA *rel) 593 { 594 *where = value + rel->r_addend; 595 } 596 597 int 598 _dl_md_reloc(elf_object_t *object, int rel, int relasz) 599 { 600 long i; 601 long numrela; 602 long relrel; 603 int fails = 0; 604 Elf_Addr loff; 605 Elf_Addr prev_value = 0; 606 const Elf_Sym *prev_sym = NULL; 607 Elf_RelA *rels; 608 struct load_list *llist; 609 610 loff = object->obj_base; 611 numrela = object->Dyn.info[relasz] / sizeof(Elf_RelA); 612 relrel = rel == DT_RELA ? object->relacount : 0; 613 rels = (Elf_RelA *)(object->Dyn.info[rel]); 614 615 if (rels == NULL) 616 return(0); 617 618 if (relrel > numrela) { 619 _dl_printf("relacount > numrel: %ld > %ld\n", relrel, numrela); 620 _dl_exit(20); 621 } 622 623 /* 624 * unprotect some segments if we need it. 625 */ 626 if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) { 627 for (llist = object->load_list; 628 llist != NULL; 629 llist = llist->next) { 630 if (!(llist->prot & PROT_WRITE)) 631 _dl_mprotect(llist->start, llist->size, 632 llist->prot|PROT_WRITE); 633 } 634 } 635 636 /* tight loop for leading RELATIVE relocs */ 637 for (i = 0; i < relrel; i++, rels++) { 638 Elf_Addr *where; 639 640 #ifdef DEBUG 641 if (ELF_R_TYPE(rels->r_info) != R_TYPE(RELATIVE)) { 642 _dl_printf("RELACOUNT wrong\n"); 643 _dl_exit(20); 644 } 645 #endif 646 where = (Elf_Addr *)(rels->r_offset + loff); 647 *where = rels->r_addend + loff; 648 } 649 for (; i < numrela; i++, rels++) { 650 Elf_Addr *where, value, ooff, mask; 651 Elf_Word type; 652 const Elf_Sym *sym, *this; 653 const char *symn; 654 655 type = ELF_R_TYPE(rels->r_info); 656 657 if (reloc_target_flags[type] & _RF_E) { 658 _dl_printf(" bad relocation obj %s %d %d\n", object->load_name, i, type); 659 _dl_exit(1); 660 } 661 if (type == R_TYPE(NONE)) 662 continue; 663 664 if (type == R_TYPE(JMP_SLOT) && rel != DT_JMPREL) 665 continue; 666 667 where = (Elf_Addr *)(rels->r_offset + loff); 668 669 if (RELOC_USE_ADDEND(type)) 670 #ifdef LDSO_ARCH_IS_RELA_ 671 value = rels->r_addend; 672 #else 673 value = *where & RELOC_VALUE_BITMASK(type); 674 #endif 675 else 676 value = 0; 677 678 679 sym = NULL; 680 symn = NULL; 681 if (RELOC_RESOLVE_SYMBOL(type)) { 682 sym = object->dyn.symtab; 683 sym += ELF_R_SYM(rels->r_info); 684 symn = object->dyn.strtab + sym->st_name; 685 686 if (sym->st_shndx != SHN_UNDEF && 687 ELF_ST_BIND(sym->st_info) == STB_LOCAL) { 688 value += loff; 689 } else if (sym == prev_sym) { 690 value += prev_value; 691 } else { 692 this = NULL; 693 #if 1 694 ooff = _dl_find_symbol_bysym(object, 695 ELF_R_SYM(rels->r_info), &this, 696 SYM_SEARCH_ALL|SYM_WARNNOTFOUND| 697 ((type == R_TYPE(JMP_SLOT)) ? 698 SYM_PLT : SYM_NOTPLT), 699 sym, NULL); 700 #else 701 ooff = _dl_find_symbol_bysym(object, 702 ELF_R_SYM(rels->r_info), &this, 703 SYM_SEARCH_ALL|SYM_WARNNOTFOUND| 704 SYM_PLT, 705 sym, NULL); 706 #endif 707 if (this == NULL) { 708 resolve_failed: 709 if (ELF_ST_BIND(sym->st_info) != 710 STB_WEAK) 711 fails++; 712 continue; 713 } 714 prev_sym = sym; 715 prev_value = (Elf_Addr)(ooff + this->st_value); 716 value += prev_value; 717 } 718 } 719 720 if (type == R_TYPE(JMP_SLOT)) { 721 _dl_reloc_plt((Elf_Word *)where, value, rels); 722 continue; 723 } 724 725 if (type == R_TYPE(COPY)) { 726 void *dstaddr = where; 727 const void *srcaddr; 728 const Elf_Sym *dstsym = sym, *srcsym = NULL; 729 Elf_Addr soff; 730 731 soff = _dl_find_symbol(symn, &srcsym, 732 SYM_SEARCH_OTHER|SYM_WARNNOTFOUND|SYM_NOTPLT, 733 dstsym, object, NULL); 734 if (srcsym == NULL) 735 goto resolve_failed; 736 737 srcaddr = (void *)(soff + srcsym->st_value); 738 _dl_bcopy(srcaddr, dstaddr, dstsym->st_size); 739 continue; 740 } 741 742 if (RELOC_PC_RELATIVE(type)) 743 value -= (Elf_Addr)where; 744 if (RELOC_BASE_RELATIVE(type)) 745 value += loff; 746 747 mask = RELOC_VALUE_BITMASK(type); 748 value >>= RELOC_VALUE_RIGHTSHIFT(type); 749 value &= mask; 750 751 if (RELOC_UNALIGNED(type)) { 752 /* Handle unaligned relocations. */ 753 Elf_Addr tmp = 0; 754 char *ptr = (char *)where; 755 int i, size = RELOC_TARGET_SIZE(type)/8; 756 757 /* Read it in one byte at a time. */ 758 for (i=0; i<size; i++) 759 tmp = (tmp << 8) | ptr[i]; 760 761 tmp &= ~mask; 762 tmp |= value; 763 764 /* Write it back out. */ 765 for (i=0; i<size; i++) 766 ptr[i] = ((tmp >> (8*i)) & 0xff); 767 } else { 768 *where &= ~mask; 769 *where |= value; 770 } 771 } 772 773 /* reprotect the unprotected segments */ 774 if ((object->dyn.textrel == 1) && (rel == DT_REL || rel == DT_RELA)) { 775 for (llist = object->load_list; 776 llist != NULL; 777 llist = llist->next) { 778 if (!(llist->prot & PROT_WRITE)) 779 _dl_mprotect(llist->start, llist->size, 780 llist->prot); 781 } 782 } 783 784 return (fails); 785 } 786 787 /* 788 * Relocate the Global Offset Table (GOT). 789 * This is done by calling _dl_md_reloc on DT_JUMPREL for DL_BIND_NOW, 790 * otherwise the lazy binding plt initialization is performed. 791 */ 792 int 793 _dl_md_reloc_got(elf_object_t *object, int lazy) 794 { 795 int fails = 0; 796 Elf_Addr *pltgot = (Elf_Addr *)object->Dyn.info[DT_PLTGOT]; 797 Elf_Addr ooff; 798 const Elf_Sym *this; 799 int i, num; 800 Elf_RelA *rel; 801 802 if (object->Dyn.info[DT_PLTREL] != DT_RELA) 803 return (0); 804 805 object->got_addr = 0; 806 object->got_size = 0; 807 this = NULL; 808 ooff = _dl_find_symbol("__got_start", &this, 809 SYM_SEARCH_OBJ|SYM_NOWARNNOTFOUND|SYM_PLT, NULL, object, NULL); 810 if (this != NULL) 811 object->got_addr = ooff + this->st_value; 812 813 this = NULL; 814 ooff = _dl_find_symbol("__got_end", &this, 815 SYM_SEARCH_OBJ|SYM_NOWARNNOTFOUND|SYM_PLT, NULL, object, NULL); 816 if (this != NULL) 817 object->got_size = ooff + this->st_value - object->got_addr; 818 819 if (object->got_addr == 0) 820 object->got_start = 0; 821 else { 822 object->got_start = ELF_TRUNC(object->got_addr, _dl_pagesz); 823 object->got_size += object->got_addr - object->got_start; 824 object->got_size = ELF_ROUND(object->got_size, _dl_pagesz); 825 } 826 object->plt_start = 0; 827 object->plt_size = 0; 828 829 if (object->traced) 830 lazy = 1; 831 832 if (!lazy) { 833 fails = _dl_md_reloc(object, DT_JMPREL, DT_PLTRELSZ); 834 } else { 835 rel = (Elf_RelA *)(object->Dyn.info[DT_JMPREL]); 836 num = (object->Dyn.info[DT_PLTRELSZ]) / sizeof(Elf_RelA); 837 838 for (i = 0; i < num; i++, rel++) { 839 Elf_Addr *where, value; 840 Elf_Word type; 841 842 where = (Elf_Addr *)(rel->r_offset + object->obj_base); 843 type = ELF_R_TYPE(rel->r_info); 844 if (RELOC_USE_ADDEND(type)) 845 value = rel->r_addend; 846 else 847 value = 0; 848 *where += object->obj_base + value; 849 } 850 851 pltgot[1] = (Elf_Addr)object; 852 pltgot[2] = (Elf_Addr)_dl_bind_start; 853 } 854 if (object->got_size != 0) 855 _dl_mprotect((void*)object->got_start, object->got_size, 856 PROT_READ); 857 858 return (fails); 859 } 860 861 Elf_Addr 862 _dl_bind(elf_object_t *object, int reloff) 863 { 864 Elf_RelA *rel; 865 Elf_Word *addr; 866 const Elf_Sym *sym, *this; 867 const char *symn; 868 const elf_object_t *sobj; 869 Elf_Addr ooff, newval; 870 sigset_t savedmask; 871 872 rel = (Elf_RelA *)(object->Dyn.info[DT_JMPREL] + reloff); 873 874 sym = object->dyn.symtab; 875 sym += ELF_R_SYM(rel->r_info); 876 symn = object->dyn.strtab + sym->st_name; 877 878 this = NULL; 879 ooff = _dl_find_symbol(symn, &this, 880 SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_PLT, sym, object, &sobj); 881 if (this == NULL) { 882 _dl_printf("lazy binding failed!\n"); 883 *(volatile int *)0 = 0; /* XXX */ 884 } 885 886 newval = ooff + this->st_value; 887 888 if (sobj->traced && _dl_trace_plt(sobj, symn)) 889 return newval; 890 891 addr = (Elf_Addr *)(object->obj_base + rel->r_offset); 892 893 /* if GOT is protected, allow the write */ 894 if (object->got_size != 0) { 895 _dl_thread_bind_lock(0, &savedmask); 896 _dl_mprotect((void*)object->got_start, object->got_size, 897 PROT_READ|PROT_WRITE); 898 } 899 900 if (*addr != newval) 901 *addr = newval; 902 903 /* put the GOT back to RO */ 904 if (object->got_size != 0) { 905 _dl_mprotect((void*)object->got_start, object->got_size, 906 PROT_READ); 907 _dl_thread_bind_lock(1, &savedmask); 908 } 909 return newval; 910 } 911