| 1 | /* $NetBSD: subr_kobj.c,v 1.59 2016/08/02 12:23:08 martin Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software developed for The NetBSD Foundation |
| 8 | * by Andrew Doran. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /*- |
| 33 | * Copyright (c) 1998-2000 Doug Rabson |
| 34 | * Copyright (c) 2004 Peter Wemm |
| 35 | * All rights reserved. |
| 36 | * |
| 37 | * Redistribution and use in source and binary forms, with or without |
| 38 | * modification, are permitted provided that the following conditions |
| 39 | * are met: |
| 40 | * 1. Redistributions of source code must retain the above copyright |
| 41 | * notice, this list of conditions and the following disclaimer. |
| 42 | * 2. Redistributions in binary form must reproduce the above copyright |
| 43 | * notice, this list of conditions and the following disclaimer in the |
| 44 | * documentation and/or other materials provided with the distribution. |
| 45 | * |
| 46 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 47 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 49 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 52 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 53 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 54 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 55 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 56 | * SUCH DAMAGE. |
| 57 | */ |
| 58 | |
| 59 | /* |
| 60 | * Kernel loader for ELF objects. |
| 61 | * |
| 62 | * TODO: adjust kmem_alloc() calls to avoid needless fragmentation. |
| 63 | */ |
| 64 | |
| 65 | #include <sys/cdefs.h> |
| 66 | __KERNEL_RCSID(0, "$NetBSD: subr_kobj.c,v 1.59 2016/08/02 12:23:08 martin Exp $" ); |
| 67 | |
| 68 | #ifdef _KERNEL_OPT |
| 69 | #include "opt_modular.h" |
| 70 | #endif |
| 71 | |
| 72 | #include <sys/kobj_impl.h> |
| 73 | |
| 74 | #ifdef MODULAR |
| 75 | |
| 76 | #include <sys/param.h> |
| 77 | #include <sys/kernel.h> |
| 78 | #include <sys/kmem.h> |
| 79 | #include <sys/proc.h> |
| 80 | #include <sys/ksyms.h> |
| 81 | #include <sys/module.h> |
| 82 | |
| 83 | #include <uvm/uvm_extern.h> |
| 84 | |
| 85 | #define kobj_error(_kobj, ...) \ |
| 86 | kobj_out(__func__, __LINE__, _kobj, __VA_ARGS__) |
| 87 | |
| 88 | static int kobj_relocate(kobj_t, bool); |
| 89 | static int kobj_checksyms(kobj_t, bool); |
| 90 | static void kobj_out(const char *, int, kobj_t, const char *, ...) |
| 91 | __printflike(4, 5); |
| 92 | static void kobj_jettison(kobj_t); |
| 93 | static void kobj_free(kobj_t, void *, size_t); |
| 94 | static void kobj_close(kobj_t); |
| 95 | static int kobj_read_mem(kobj_t, void **, size_t, off_t, bool); |
| 96 | static void kobj_close_mem(kobj_t); |
| 97 | |
| 98 | extern struct vm_map *module_map; |
| 99 | |
| 100 | /* |
| 101 | * kobj_load_mem: |
| 102 | * |
| 103 | * Load an object already resident in memory. If size is not -1, |
| 104 | * the complete size of the object is known. |
| 105 | */ |
| 106 | int |
| 107 | kobj_load_mem(kobj_t *kop, const char *name, void *base, ssize_t size) |
| 108 | { |
| 109 | kobj_t ko; |
| 110 | |
| 111 | ko = kmem_zalloc(sizeof(*ko), KM_SLEEP); |
| 112 | if (ko == NULL) { |
| 113 | return ENOMEM; |
| 114 | } |
| 115 | |
| 116 | ko->ko_type = KT_MEMORY; |
| 117 | kobj_setname(ko, name); |
| 118 | ko->ko_source = base; |
| 119 | ko->ko_memsize = size; |
| 120 | ko->ko_read = kobj_read_mem; |
| 121 | ko->ko_close = kobj_close_mem; |
| 122 | |
| 123 | *kop = ko; |
| 124 | return kobj_load(ko); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * kobj_close: |
| 129 | * |
| 130 | * Close an open ELF object. |
| 131 | */ |
| 132 | static void |
| 133 | kobj_close(kobj_t ko) |
| 134 | { |
| 135 | |
| 136 | if (ko->ko_source == NULL) { |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | ko->ko_close(ko); |
| 141 | ko->ko_source = NULL; |
| 142 | } |
| 143 | |
| 144 | static void |
| 145 | kobj_close_mem(kobj_t ko) |
| 146 | { |
| 147 | |
| 148 | return; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * kobj_load: |
| 153 | * |
| 154 | * Load an ELF object and prepare to link into the running kernel |
| 155 | * image. |
| 156 | */ |
| 157 | int |
| 158 | kobj_load(kobj_t ko) |
| 159 | { |
| 160 | Elf_Ehdr *hdr; |
| 161 | Elf_Shdr *shdr; |
| 162 | Elf_Sym *es; |
| 163 | vaddr_t map_text_base; |
| 164 | vaddr_t map_data_base; |
| 165 | vaddr_t map_rodata_base; |
| 166 | size_t map_text_size; |
| 167 | size_t map_data_size; |
| 168 | size_t map_rodata_size; |
| 169 | int error; |
| 170 | int symtabindex; |
| 171 | int symstrindex; |
| 172 | int nsym; |
| 173 | int pb, rl, ra; |
| 174 | int alignmask; |
| 175 | int i, j; |
| 176 | void *addr; |
| 177 | |
| 178 | KASSERT(ko->ko_type != KT_UNSET); |
| 179 | KASSERT(ko->ko_source != NULL); |
| 180 | |
| 181 | shdr = NULL; |
| 182 | error = 0; |
| 183 | hdr = NULL; |
| 184 | |
| 185 | /* |
| 186 | * Read the elf header from the file. |
| 187 | */ |
| 188 | error = ko->ko_read(ko, (void **)&hdr, sizeof(*hdr), 0, true); |
| 189 | if (error != 0) { |
| 190 | kobj_error(ko, "read failed %d" , error); |
| 191 | goto out; |
| 192 | } |
| 193 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) { |
| 194 | kobj_error(ko, "not an ELF object" ); |
| 195 | error = ENOEXEC; |
| 196 | goto out; |
| 197 | } |
| 198 | |
| 199 | if (hdr->e_ident[EI_VERSION] != EV_CURRENT || |
| 200 | hdr->e_version != EV_CURRENT) { |
| 201 | kobj_error(ko, "unsupported file version %d" , |
| 202 | hdr->e_ident[EI_VERSION]); |
| 203 | error = ENOEXEC; |
| 204 | goto out; |
| 205 | } |
| 206 | if (hdr->e_type != ET_REL) { |
| 207 | kobj_error(ko, "unsupported file type %d" , hdr->e_type); |
| 208 | error = ENOEXEC; |
| 209 | goto out; |
| 210 | } |
| 211 | switch (hdr->e_machine) { |
| 212 | #if ELFSIZE == 32 |
| 213 | ELF32_MACHDEP_ID_CASES |
| 214 | #elif ELFSIZE == 64 |
| 215 | ELF64_MACHDEP_ID_CASES |
| 216 | #else |
| 217 | #error not defined |
| 218 | #endif |
| 219 | default: |
| 220 | kobj_error(ko, "unsupported machine %d" , hdr->e_machine); |
| 221 | error = ENOEXEC; |
| 222 | goto out; |
| 223 | } |
| 224 | |
| 225 | ko->ko_nprogtab = 0; |
| 226 | ko->ko_shdr = 0; |
| 227 | ko->ko_nrel = 0; |
| 228 | ko->ko_nrela = 0; |
| 229 | |
| 230 | /* |
| 231 | * Allocate and read in the section header. |
| 232 | */ |
| 233 | if (hdr->e_shnum == 0 || hdr->e_shnum > ELF_MAXSHNUM || |
| 234 | hdr->e_shoff == 0 || hdr->e_shentsize != sizeof(Elf_Shdr)) { |
| 235 | kobj_error(ko, "bad sizes" ); |
| 236 | error = ENOEXEC; |
| 237 | goto out; |
| 238 | } |
| 239 | ko->ko_shdrsz = hdr->e_shnum * sizeof(Elf_Shdr); |
| 240 | error = ko->ko_read(ko, (void **)&shdr, ko->ko_shdrsz, hdr->e_shoff, |
| 241 | true); |
| 242 | if (error != 0) { |
| 243 | kobj_error(ko, "read failed %d" , error); |
| 244 | goto out; |
| 245 | } |
| 246 | ko->ko_shdr = shdr; |
| 247 | |
| 248 | /* |
| 249 | * Scan the section header for information and table sizing. |
| 250 | */ |
| 251 | nsym = 0; |
| 252 | symtabindex = symstrindex = -1; |
| 253 | for (i = 0; i < hdr->e_shnum; i++) { |
| 254 | switch (shdr[i].sh_type) { |
| 255 | case SHT_PROGBITS: |
| 256 | case SHT_NOBITS: |
| 257 | ko->ko_nprogtab++; |
| 258 | break; |
| 259 | case SHT_SYMTAB: |
| 260 | nsym++; |
| 261 | symtabindex = i; |
| 262 | symstrindex = shdr[i].sh_link; |
| 263 | break; |
| 264 | case SHT_REL: |
| 265 | if (shdr[shdr[i].sh_info].sh_type != SHT_PROGBITS) |
| 266 | continue; |
| 267 | ko->ko_nrel++; |
| 268 | break; |
| 269 | case SHT_RELA: |
| 270 | if (shdr[shdr[i].sh_info].sh_type != SHT_PROGBITS) |
| 271 | continue; |
| 272 | ko->ko_nrela++; |
| 273 | break; |
| 274 | case SHT_STRTAB: |
| 275 | break; |
| 276 | } |
| 277 | } |
| 278 | if (ko->ko_nprogtab == 0) { |
| 279 | kobj_error(ko, "file has no contents" ); |
| 280 | error = ENOEXEC; |
| 281 | goto out; |
| 282 | } |
| 283 | if (nsym != 1) { |
| 284 | /* Only allow one symbol table for now */ |
| 285 | kobj_error(ko, "file has no valid symbol table" ); |
| 286 | error = ENOEXEC; |
| 287 | goto out; |
| 288 | } |
| 289 | KASSERT(symtabindex != -1); |
| 290 | KASSERT(symstrindex != -1); |
| 291 | |
| 292 | if (symstrindex == SHN_UNDEF || symstrindex >= hdr->e_shnum || |
| 293 | shdr[symstrindex].sh_type != SHT_STRTAB) { |
| 294 | kobj_error(ko, "file has invalid symbol strings" ); |
| 295 | error = ENOEXEC; |
| 296 | goto out; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Allocate space for tracking the load chunks. |
| 301 | */ |
| 302 | if (ko->ko_nprogtab != 0) { |
| 303 | ko->ko_progtab = kmem_zalloc(ko->ko_nprogtab * |
| 304 | sizeof(*ko->ko_progtab), KM_SLEEP); |
| 305 | if (ko->ko_progtab == NULL) { |
| 306 | error = ENOMEM; |
| 307 | kobj_error(ko, "out of memory" ); |
| 308 | goto out; |
| 309 | } |
| 310 | } |
| 311 | if (ko->ko_nrel != 0) { |
| 312 | ko->ko_reltab = kmem_zalloc(ko->ko_nrel * |
| 313 | sizeof(*ko->ko_reltab), KM_SLEEP); |
| 314 | if (ko->ko_reltab == NULL) { |
| 315 | error = ENOMEM; |
| 316 | kobj_error(ko, "out of memory" ); |
| 317 | goto out; |
| 318 | } |
| 319 | } |
| 320 | if (ko->ko_nrela != 0) { |
| 321 | ko->ko_relatab = kmem_zalloc(ko->ko_nrela * |
| 322 | sizeof(*ko->ko_relatab), KM_SLEEP); |
| 323 | if (ko->ko_relatab == NULL) { |
| 324 | error = ENOMEM; |
| 325 | kobj_error(ko, "out of memory" ); |
| 326 | goto out; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Allocate space for and load the symbol table. |
| 332 | */ |
| 333 | ko->ko_symcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym); |
| 334 | if (ko->ko_symcnt == 0) { |
| 335 | kobj_error(ko, "no symbol table" ); |
| 336 | error = ENOEXEC; |
| 337 | goto out; |
| 338 | } |
| 339 | error = ko->ko_read(ko, (void **)&ko->ko_symtab, |
| 340 | ko->ko_symcnt * sizeof(Elf_Sym), |
| 341 | shdr[symtabindex].sh_offset, true); |
| 342 | if (error != 0) { |
| 343 | kobj_error(ko, "read failed %d" , error); |
| 344 | goto out; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Allocate space for and load the symbol strings. |
| 349 | */ |
| 350 | ko->ko_strtabsz = shdr[symstrindex].sh_size; |
| 351 | if (ko->ko_strtabsz == 0) { |
| 352 | kobj_error(ko, "no symbol strings" ); |
| 353 | error = ENOEXEC; |
| 354 | goto out; |
| 355 | } |
| 356 | error = ko->ko_read(ko, (void *)&ko->ko_strtab, ko->ko_strtabsz, |
| 357 | shdr[symstrindex].sh_offset, true); |
| 358 | if (error != 0) { |
| 359 | kobj_error(ko, "read failed %d" , error); |
| 360 | goto out; |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Adjust module symbol namespace, if necessary (e.g. with rump) |
| 365 | */ |
| 366 | error = kobj_renamespace(ko->ko_symtab, ko->ko_symcnt, |
| 367 | &ko->ko_strtab, &ko->ko_strtabsz); |
| 368 | if (error != 0) { |
| 369 | kobj_error(ko, "renamespace failed %d" , error); |
| 370 | goto out; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Do we have a string table for the section names? |
| 375 | */ |
| 376 | if (hdr->e_shstrndx != SHN_UNDEF) { |
| 377 | if (hdr->e_shstrndx >= hdr->e_shnum) { |
| 378 | kobj_error(ko, "bad shstrndx" ); |
| 379 | error = ENOEXEC; |
| 380 | goto out; |
| 381 | } |
| 382 | if (shdr[hdr->e_shstrndx].sh_size != 0 && |
| 383 | shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) { |
| 384 | ko->ko_shstrtabsz = shdr[hdr->e_shstrndx].sh_size; |
| 385 | error = ko->ko_read(ko, (void **)&ko->ko_shstrtab, |
| 386 | shdr[hdr->e_shstrndx].sh_size, |
| 387 | shdr[hdr->e_shstrndx].sh_offset, true); |
| 388 | if (error != 0) { |
| 389 | kobj_error(ko, "read failed %d" , error); |
| 390 | goto out; |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Size up code/data(progbits) and bss(nobits). |
| 397 | */ |
| 398 | alignmask = 0; |
| 399 | map_text_size = 0; |
| 400 | map_data_size = 0; |
| 401 | map_rodata_size = 0; |
| 402 | for (i = 0; i < hdr->e_shnum; i++) { |
| 403 | if (shdr[i].sh_type != SHT_PROGBITS && |
| 404 | shdr[i].sh_type != SHT_NOBITS) |
| 405 | continue; |
| 406 | alignmask = shdr[i].sh_addralign - 1; |
| 407 | if ((shdr[i].sh_flags & SHF_EXECINSTR)) { |
| 408 | map_text_size += alignmask; |
| 409 | map_text_size &= ~alignmask; |
| 410 | map_text_size += shdr[i].sh_size; |
| 411 | } else if (!(shdr[i].sh_flags & SHF_WRITE)) { |
| 412 | map_rodata_size += alignmask; |
| 413 | map_rodata_size &= ~alignmask; |
| 414 | map_rodata_size += shdr[i].sh_size; |
| 415 | } else { |
| 416 | map_data_size += alignmask; |
| 417 | map_data_size &= ~alignmask; |
| 418 | map_data_size += shdr[i].sh_size; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | if (map_text_size == 0) { |
| 423 | kobj_error(ko, "no text" ); |
| 424 | error = ENOEXEC; |
| 425 | goto out; |
| 426 | } |
| 427 | |
| 428 | if (map_data_size != 0) { |
| 429 | map_data_base = uvm_km_alloc(module_map, round_page(map_data_size), |
| 430 | 0, UVM_KMF_WIRED); |
| 431 | if (map_data_base == 0) { |
| 432 | kobj_error(ko, "out of memory" ); |
| 433 | error = ENOMEM; |
| 434 | goto out; |
| 435 | } |
| 436 | ko->ko_data_address = map_data_base; |
| 437 | ko->ko_data_size = map_data_size; |
| 438 | } else { |
| 439 | map_data_base = 0; |
| 440 | ko->ko_data_address = 0; |
| 441 | ko->ko_data_size = 0; |
| 442 | } |
| 443 | |
| 444 | if (map_rodata_size != 0) { |
| 445 | map_rodata_base = uvm_km_alloc(module_map, round_page(map_rodata_size), |
| 446 | 0, UVM_KMF_WIRED); |
| 447 | if (map_rodata_base == 0) { |
| 448 | kobj_error(ko, "out of memory" ); |
| 449 | error = ENOMEM; |
| 450 | goto out; |
| 451 | } |
| 452 | ko->ko_rodata_address = map_rodata_base; |
| 453 | ko->ko_rodata_size = map_rodata_size; |
| 454 | } else { |
| 455 | map_rodata_base = 0; |
| 456 | ko->ko_rodata_address = 0; |
| 457 | ko->ko_rodata_size = 0; |
| 458 | } |
| 459 | |
| 460 | map_text_base = uvm_km_alloc(module_map, round_page(map_text_size), |
| 461 | 0, UVM_KMF_WIRED | UVM_KMF_EXEC); |
| 462 | if (map_text_base == 0) { |
| 463 | kobj_error(ko, "out of memory" ); |
| 464 | error = ENOMEM; |
| 465 | goto out; |
| 466 | } |
| 467 | ko->ko_text_address = map_text_base; |
| 468 | ko->ko_text_size = map_text_size; |
| 469 | |
| 470 | /* |
| 471 | * Now load code/data(progbits), zero bss(nobits), allocate space |
| 472 | * for and load relocs |
| 473 | */ |
| 474 | pb = 0; |
| 475 | rl = 0; |
| 476 | ra = 0; |
| 477 | alignmask = 0; |
| 478 | for (i = 0; i < hdr->e_shnum; i++) { |
| 479 | switch (shdr[i].sh_type) { |
| 480 | case SHT_PROGBITS: |
| 481 | case SHT_NOBITS: |
| 482 | alignmask = shdr[i].sh_addralign - 1; |
| 483 | if ((shdr[i].sh_flags & SHF_EXECINSTR)) { |
| 484 | map_text_base += alignmask; |
| 485 | map_text_base &= ~alignmask; |
| 486 | addr = (void *)map_text_base; |
| 487 | map_text_base += shdr[i].sh_size; |
| 488 | } else if (!(shdr[i].sh_flags & SHF_WRITE)) { |
| 489 | map_rodata_base += alignmask; |
| 490 | map_rodata_base &= ~alignmask; |
| 491 | addr = (void *)map_rodata_base; |
| 492 | map_rodata_base += shdr[i].sh_size; |
| 493 | } else { |
| 494 | map_data_base += alignmask; |
| 495 | map_data_base &= ~alignmask; |
| 496 | addr = (void *)map_data_base; |
| 497 | map_data_base += shdr[i].sh_size; |
| 498 | } |
| 499 | |
| 500 | ko->ko_progtab[pb].addr = addr; |
| 501 | if (shdr[i].sh_type == SHT_PROGBITS) { |
| 502 | ko->ko_progtab[pb].name = "<<PROGBITS>>" ; |
| 503 | error = ko->ko_read(ko, &addr, |
| 504 | shdr[i].sh_size, shdr[i].sh_offset, false); |
| 505 | if (error != 0) { |
| 506 | kobj_error(ko, "read failed %d" , error); |
| 507 | goto out; |
| 508 | } |
| 509 | } else { /* SHT_NOBITS */ |
| 510 | ko->ko_progtab[pb].name = "<<NOBITS>>" ; |
| 511 | memset(addr, 0, shdr[i].sh_size); |
| 512 | } |
| 513 | |
| 514 | ko->ko_progtab[pb].size = shdr[i].sh_size; |
| 515 | ko->ko_progtab[pb].sec = i; |
| 516 | if (ko->ko_shstrtab != NULL && shdr[i].sh_name != 0) { |
| 517 | ko->ko_progtab[pb].name = |
| 518 | ko->ko_shstrtab + shdr[i].sh_name; |
| 519 | } |
| 520 | |
| 521 | /* Update all symbol values with the offset. */ |
| 522 | for (j = 0; j < ko->ko_symcnt; j++) { |
| 523 | es = &ko->ko_symtab[j]; |
| 524 | if (es->st_shndx != i) { |
| 525 | continue; |
| 526 | } |
| 527 | es->st_value += (Elf_Addr)addr; |
| 528 | } |
| 529 | pb++; |
| 530 | break; |
| 531 | case SHT_REL: |
| 532 | if (shdr[shdr[i].sh_info].sh_type != SHT_PROGBITS) |
| 533 | break; |
| 534 | ko->ko_reltab[rl].size = shdr[i].sh_size; |
| 535 | ko->ko_reltab[rl].size -= |
| 536 | shdr[i].sh_size % sizeof(Elf_Rel); |
| 537 | if (ko->ko_reltab[rl].size != 0) { |
| 538 | ko->ko_reltab[rl].nrel = |
| 539 | shdr[i].sh_size / sizeof(Elf_Rel); |
| 540 | ko->ko_reltab[rl].sec = shdr[i].sh_info; |
| 541 | error = ko->ko_read(ko, |
| 542 | (void **)&ko->ko_reltab[rl].rel, |
| 543 | ko->ko_reltab[rl].size, |
| 544 | shdr[i].sh_offset, true); |
| 545 | if (error != 0) { |
| 546 | kobj_error(ko, "read failed %d" , |
| 547 | error); |
| 548 | goto out; |
| 549 | } |
| 550 | } |
| 551 | rl++; |
| 552 | break; |
| 553 | case SHT_RELA: |
| 554 | if (shdr[shdr[i].sh_info].sh_type != SHT_PROGBITS) |
| 555 | break; |
| 556 | ko->ko_relatab[ra].size = shdr[i].sh_size; |
| 557 | ko->ko_relatab[ra].size -= |
| 558 | shdr[i].sh_size % sizeof(Elf_Rela); |
| 559 | if (ko->ko_relatab[ra].size != 0) { |
| 560 | ko->ko_relatab[ra].nrela = |
| 561 | shdr[i].sh_size / sizeof(Elf_Rela); |
| 562 | ko->ko_relatab[ra].sec = shdr[i].sh_info; |
| 563 | error = ko->ko_read(ko, |
| 564 | (void **)&ko->ko_relatab[ra].rela, |
| 565 | shdr[i].sh_size, |
| 566 | shdr[i].sh_offset, true); |
| 567 | if (error != 0) { |
| 568 | kobj_error(ko, "read failed %d" , error); |
| 569 | goto out; |
| 570 | } |
| 571 | } |
| 572 | ra++; |
| 573 | break; |
| 574 | default: |
| 575 | break; |
| 576 | } |
| 577 | } |
| 578 | if (pb != ko->ko_nprogtab) { |
| 579 | panic("%s:%d: %s: lost progbits" , __func__, __LINE__, |
| 580 | ko->ko_name); |
| 581 | } |
| 582 | if (rl != ko->ko_nrel) { |
| 583 | panic("%s:%d: %s: lost rel" , __func__, __LINE__, |
| 584 | ko->ko_name); |
| 585 | } |
| 586 | if (ra != ko->ko_nrela) { |
| 587 | panic("%s:%d: %s: lost rela" , __func__, __LINE__, |
| 588 | ko->ko_name); |
| 589 | } |
| 590 | if (map_text_base != ko->ko_text_address + map_text_size) { |
| 591 | panic("%s:%d: %s: map_text_base 0x%lx != address %lx " |
| 592 | "+ map_text_size %ld (0x%lx)\n" , |
| 593 | __func__, __LINE__, ko->ko_name, (long)map_text_base, |
| 594 | (long)ko->ko_text_address, (long)map_text_size, |
| 595 | (long)ko->ko_text_address + map_text_size); |
| 596 | } |
| 597 | if (map_data_base != ko->ko_data_address + map_data_size) { |
| 598 | panic("%s:%d: %s: map_data_base 0x%lx != address %lx " |
| 599 | "+ map_data_size %ld (0x%lx)\n" , |
| 600 | __func__, __LINE__, ko->ko_name, (long)map_data_base, |
| 601 | (long)ko->ko_data_address, (long)map_data_size, |
| 602 | (long)ko->ko_data_address + map_data_size); |
| 603 | } |
| 604 | if (map_rodata_base != ko->ko_rodata_address + map_rodata_size) { |
| 605 | panic("%s:%d: %s: map_rodata_base 0x%lx != address %lx " |
| 606 | "+ map_rodata_size %ld (0x%lx)\n" , |
| 607 | __func__, __LINE__, ko->ko_name, (long)map_rodata_base, |
| 608 | (long)ko->ko_rodata_address, (long)map_rodata_size, |
| 609 | (long)ko->ko_rodata_address + map_rodata_size); |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * Perform local relocations only. Relocations relating to global |
| 614 | * symbols will be done by kobj_affix(). |
| 615 | */ |
| 616 | error = kobj_checksyms(ko, false); |
| 617 | if (error == 0) { |
| 618 | error = kobj_relocate(ko, true); |
| 619 | } |
| 620 | out: |
| 621 | if (hdr != NULL) { |
| 622 | kobj_free(ko, hdr, sizeof(*hdr)); |
| 623 | } |
| 624 | kobj_close(ko); |
| 625 | if (error != 0) { |
| 626 | kobj_unload(ko); |
| 627 | } |
| 628 | |
| 629 | return error; |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * kobj_unload: |
| 634 | * |
| 635 | * Unload an object previously loaded by kobj_load(). |
| 636 | */ |
| 637 | void |
| 638 | kobj_unload(kobj_t ko) |
| 639 | { |
| 640 | int error; |
| 641 | |
| 642 | kobj_close(ko); |
| 643 | kobj_jettison(ko); |
| 644 | |
| 645 | /* |
| 646 | * Notify MD code that a module has been unloaded. |
| 647 | */ |
| 648 | if (ko->ko_loaded) { |
| 649 | error = kobj_machdep(ko, (void *)ko->ko_text_address, |
| 650 | ko->ko_text_size, false); |
| 651 | if (error != 0) |
| 652 | kobj_error(ko, "machine dependent deinit failed (text) %d" , |
| 653 | error); |
| 654 | |
| 655 | if (ko->ko_data_address != 0) { |
| 656 | error = kobj_machdep(ko, (void *)ko->ko_data_address, |
| 657 | ko->ko_data_size, false); |
| 658 | if (error != 0) |
| 659 | kobj_error(ko, "machine dependent deinit failed" |
| 660 | "(data) %d" , error); |
| 661 | } |
| 662 | |
| 663 | if (ko->ko_rodata_address != 0) { |
| 664 | error = kobj_machdep(ko, (void *)ko->ko_rodata_address, |
| 665 | ko->ko_rodata_size, false); |
| 666 | if (error != 0) |
| 667 | kobj_error(ko, "machine dependent deinit failed" |
| 668 | "(rodata) %d" , error); |
| 669 | } |
| 670 | } |
| 671 | if (ko->ko_text_address != 0) { |
| 672 | uvm_km_free(module_map, ko->ko_text_address, |
| 673 | round_page(ko->ko_text_size), UVM_KMF_WIRED); |
| 674 | } |
| 675 | if (ko->ko_data_address != 0) { |
| 676 | uvm_km_free(module_map, ko->ko_data_address, |
| 677 | round_page(ko->ko_data_size), UVM_KMF_WIRED); |
| 678 | } |
| 679 | if (ko->ko_rodata_address != 0) { |
| 680 | uvm_km_free(module_map, ko->ko_rodata_address, |
| 681 | round_page(ko->ko_rodata_size), UVM_KMF_WIRED); |
| 682 | } |
| 683 | if (ko->ko_ksyms == true) { |
| 684 | ksyms_modunload(ko->ko_name); |
| 685 | } |
| 686 | if (ko->ko_symtab != NULL) { |
| 687 | kobj_free(ko, ko->ko_symtab, ko->ko_symcnt * sizeof(Elf_Sym)); |
| 688 | } |
| 689 | if (ko->ko_strtab != NULL) { |
| 690 | kobj_free(ko, ko->ko_strtab, ko->ko_strtabsz); |
| 691 | } |
| 692 | if (ko->ko_progtab != NULL) { |
| 693 | kobj_free(ko, ko->ko_progtab, ko->ko_nprogtab * |
| 694 | sizeof(*ko->ko_progtab)); |
| 695 | ko->ko_progtab = NULL; |
| 696 | } |
| 697 | if (ko->ko_shstrtab) { |
| 698 | kobj_free(ko, ko->ko_shstrtab, ko->ko_shstrtabsz); |
| 699 | ko->ko_shstrtab = NULL; |
| 700 | } |
| 701 | |
| 702 | kmem_free(ko, sizeof(*ko)); |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * kobj_stat: |
| 707 | * |
| 708 | * Return size and load address of an object. |
| 709 | */ |
| 710 | int |
| 711 | kobj_stat(kobj_t ko, vaddr_t *address, size_t *size) |
| 712 | { |
| 713 | |
| 714 | if (address != NULL) { |
| 715 | *address = ko->ko_text_address; |
| 716 | } |
| 717 | if (size != NULL) { |
| 718 | *size = ko->ko_text_size; |
| 719 | } |
| 720 | return 0; |
| 721 | } |
| 722 | |
| 723 | /* |
| 724 | * kobj_affix: |
| 725 | * |
| 726 | * Set an object's name and perform global relocs. May only be |
| 727 | * called after the module and any requisite modules are loaded. |
| 728 | */ |
| 729 | int |
| 730 | kobj_affix(kobj_t ko, const char *name) |
| 731 | { |
| 732 | int error; |
| 733 | |
| 734 | KASSERT(ko->ko_ksyms == false); |
| 735 | KASSERT(ko->ko_loaded == false); |
| 736 | |
| 737 | kobj_setname(ko, name); |
| 738 | |
| 739 | /* Cache addresses of undefined symbols. */ |
| 740 | error = kobj_checksyms(ko, true); |
| 741 | |
| 742 | /* Now do global relocations. */ |
| 743 | if (error == 0) |
| 744 | error = kobj_relocate(ko, false); |
| 745 | |
| 746 | /* |
| 747 | * Now that we know the name, register the symbol table. |
| 748 | * Do after global relocations because ksyms will pack |
| 749 | * the table. |
| 750 | */ |
| 751 | if (error == 0) { |
| 752 | ksyms_modload(ko->ko_name, ko->ko_symtab, ko->ko_symcnt * |
| 753 | sizeof(Elf_Sym), ko->ko_strtab, ko->ko_strtabsz); |
| 754 | ko->ko_ksyms = true; |
| 755 | } |
| 756 | |
| 757 | /* Jettison unneeded memory post-link. */ |
| 758 | kobj_jettison(ko); |
| 759 | |
| 760 | /* |
| 761 | * Notify MD code that a module has been loaded. |
| 762 | * |
| 763 | * Most architectures use this opportunity to flush their caches. |
| 764 | */ |
| 765 | if (error == 0) { |
| 766 | error = kobj_machdep(ko, (void *)ko->ko_text_address, |
| 767 | ko->ko_text_size, true); |
| 768 | if (error != 0) |
| 769 | kobj_error(ko, "machine dependent init failed (text) %d" , |
| 770 | error); |
| 771 | |
| 772 | if (ko->ko_data_address != 0) { |
| 773 | error = kobj_machdep(ko, (void *)ko->ko_data_address, |
| 774 | ko->ko_data_size, true); |
| 775 | if (error != 0) |
| 776 | kobj_error(ko, "machine dependent init failed" |
| 777 | "(data) %d" , error); |
| 778 | } |
| 779 | |
| 780 | if (ko->ko_rodata_address != 0) { |
| 781 | error = kobj_machdep(ko, (void *)ko->ko_rodata_address, |
| 782 | ko->ko_rodata_size, true); |
| 783 | if (error != 0) |
| 784 | kobj_error(ko, "machine dependent init failed" |
| 785 | "(rodata) %d" , error); |
| 786 | } |
| 787 | |
| 788 | ko->ko_loaded = true; |
| 789 | } |
| 790 | |
| 791 | if (error == 0) { |
| 792 | /* Change the memory protections, when needed. */ |
| 793 | uvm_km_protect(module_map, ko->ko_text_address, |
| 794 | ko->ko_text_size, VM_PROT_READ|VM_PROT_EXECUTE); |
| 795 | if (ko->ko_rodata_address != 0) { |
| 796 | uvm_km_protect(module_map, ko->ko_rodata_address, |
| 797 | ko->ko_rodata_size, VM_PROT_READ); |
| 798 | } |
| 799 | } else { |
| 800 | /* If there was an error, destroy the whole object. */ |
| 801 | kobj_unload(ko); |
| 802 | } |
| 803 | |
| 804 | return error; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * kobj_find_section: |
| 809 | * |
| 810 | * Given a section name, search the loaded object and return |
| 811 | * virtual address if present and loaded. |
| 812 | */ |
| 813 | int |
| 814 | kobj_find_section(kobj_t ko, const char *name, void **addr, size_t *size) |
| 815 | { |
| 816 | int i; |
| 817 | |
| 818 | KASSERT(ko->ko_progtab != NULL); |
| 819 | |
| 820 | for (i = 0; i < ko->ko_nprogtab; i++) { |
| 821 | if (strcmp(ko->ko_progtab[i].name, name) == 0) { |
| 822 | if (addr != NULL) { |
| 823 | *addr = ko->ko_progtab[i].addr; |
| 824 | } |
| 825 | if (size != NULL) { |
| 826 | *size = ko->ko_progtab[i].size; |
| 827 | } |
| 828 | return 0; |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | return ENOENT; |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * kobj_jettison: |
| 837 | * |
| 838 | * Release object data not needed after performing relocations. |
| 839 | */ |
| 840 | static void |
| 841 | kobj_jettison(kobj_t ko) |
| 842 | { |
| 843 | int i; |
| 844 | |
| 845 | if (ko->ko_reltab != NULL) { |
| 846 | for (i = 0; i < ko->ko_nrel; i++) { |
| 847 | if (ko->ko_reltab[i].rel) { |
| 848 | kobj_free(ko, ko->ko_reltab[i].rel, |
| 849 | ko->ko_reltab[i].size); |
| 850 | } |
| 851 | } |
| 852 | kobj_free(ko, ko->ko_reltab, ko->ko_nrel * |
| 853 | sizeof(*ko->ko_reltab)); |
| 854 | ko->ko_reltab = NULL; |
| 855 | ko->ko_nrel = 0; |
| 856 | } |
| 857 | if (ko->ko_relatab != NULL) { |
| 858 | for (i = 0; i < ko->ko_nrela; i++) { |
| 859 | if (ko->ko_relatab[i].rela) { |
| 860 | kobj_free(ko, ko->ko_relatab[i].rela, |
| 861 | ko->ko_relatab[i].size); |
| 862 | } |
| 863 | } |
| 864 | kobj_free(ko, ko->ko_relatab, ko->ko_nrela * |
| 865 | sizeof(*ko->ko_relatab)); |
| 866 | ko->ko_relatab = NULL; |
| 867 | ko->ko_nrela = 0; |
| 868 | } |
| 869 | if (ko->ko_shdr != NULL) { |
| 870 | kobj_free(ko, ko->ko_shdr, ko->ko_shdrsz); |
| 871 | ko->ko_shdr = NULL; |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | /* |
| 876 | * kobj_sym_lookup: |
| 877 | * |
| 878 | * Symbol lookup function to be used when the symbol index |
| 879 | * is known (ie during relocation). |
| 880 | */ |
| 881 | uintptr_t |
| 882 | kobj_sym_lookup(kobj_t ko, uintptr_t symidx) |
| 883 | { |
| 884 | const Elf_Sym *sym; |
| 885 | const char *symbol; |
| 886 | |
| 887 | /* Don't even try to lookup the symbol if the index is bogus. */ |
| 888 | if (symidx >= ko->ko_symcnt) |
| 889 | return 0; |
| 890 | |
| 891 | sym = ko->ko_symtab + symidx; |
| 892 | |
| 893 | /* Quick answer if there is a definition included. */ |
| 894 | if (sym->st_shndx != SHN_UNDEF) { |
| 895 | return (uintptr_t)sym->st_value; |
| 896 | } |
| 897 | |
| 898 | /* If we get here, then it is undefined and needs a lookup. */ |
| 899 | switch (ELF_ST_BIND(sym->st_info)) { |
| 900 | case STB_LOCAL: |
| 901 | /* Local, but undefined? huh? */ |
| 902 | kobj_error(ko, "local symbol undefined" ); |
| 903 | return 0; |
| 904 | |
| 905 | case STB_GLOBAL: |
| 906 | /* Relative to Data or Function name */ |
| 907 | symbol = ko->ko_strtab + sym->st_name; |
| 908 | |
| 909 | /* Force a lookup failure if the symbol name is bogus. */ |
| 910 | if (*symbol == 0) { |
| 911 | kobj_error(ko, "bad symbol name" ); |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | return (uintptr_t)sym->st_value; |
| 916 | |
| 917 | case STB_WEAK: |
| 918 | kobj_error(ko, "weak symbols not supported" ); |
| 919 | return 0; |
| 920 | |
| 921 | default: |
| 922 | return 0; |
| 923 | } |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * kobj_findbase: |
| 928 | * |
| 929 | * Return base address of the given section. |
| 930 | */ |
| 931 | static uintptr_t |
| 932 | kobj_findbase(kobj_t ko, int sec) |
| 933 | { |
| 934 | int i; |
| 935 | |
| 936 | for (i = 0; i < ko->ko_nprogtab; i++) { |
| 937 | if (sec == ko->ko_progtab[i].sec) { |
| 938 | return (uintptr_t)ko->ko_progtab[i].addr; |
| 939 | } |
| 940 | } |
| 941 | return 0; |
| 942 | } |
| 943 | |
| 944 | /* |
| 945 | * kobj_checksyms: |
| 946 | * |
| 947 | * Scan symbol table for duplicates or resolve references to |
| 948 | * exernal symbols. |
| 949 | */ |
| 950 | static int |
| 951 | kobj_checksyms(kobj_t ko, bool undefined) |
| 952 | { |
| 953 | unsigned long rval; |
| 954 | Elf_Sym *sym, *ms; |
| 955 | const char *name; |
| 956 | int error; |
| 957 | |
| 958 | error = 0; |
| 959 | |
| 960 | for (ms = (sym = ko->ko_symtab) + ko->ko_symcnt; sym < ms; sym++) { |
| 961 | /* Check validity of the symbol. */ |
| 962 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL || |
| 963 | sym->st_name == 0) |
| 964 | continue; |
| 965 | if (undefined != (sym->st_shndx == SHN_UNDEF)) { |
| 966 | continue; |
| 967 | } |
| 968 | |
| 969 | /* |
| 970 | * Look it up. Don't need to lock, as it is known that |
| 971 | * the symbol tables aren't going to change (we hold |
| 972 | * module_lock). |
| 973 | */ |
| 974 | name = ko->ko_strtab + sym->st_name; |
| 975 | if (ksyms_getval_unlocked(NULL, name, &rval, |
| 976 | KSYMS_EXTERN) != 0) { |
| 977 | if (undefined) { |
| 978 | kobj_error(ko, "symbol `%s' not found" , |
| 979 | name); |
| 980 | error = ENOEXEC; |
| 981 | } |
| 982 | continue; |
| 983 | } |
| 984 | |
| 985 | /* Save values of undefined globals. */ |
| 986 | if (undefined) { |
| 987 | sym->st_value = (Elf_Addr)rval; |
| 988 | continue; |
| 989 | } |
| 990 | |
| 991 | /* Check (and complain) about differing values. */ |
| 992 | if (sym->st_value == rval) { |
| 993 | continue; |
| 994 | } |
| 995 | if (strcmp(name, "_bss_start" ) == 0 || |
| 996 | strcmp(name, "__bss_start" ) == 0 || |
| 997 | strcmp(name, "_bss_end__" ) == 0 || |
| 998 | strcmp(name, "__bss_end__" ) == 0 || |
| 999 | strcmp(name, "_edata" ) == 0 || |
| 1000 | strcmp(name, "_end" ) == 0 || |
| 1001 | strcmp(name, "__end" ) == 0 || |
| 1002 | strcmp(name, "__end__" ) == 0 || |
| 1003 | strncmp(name, "__start_link_set_" , 17) == 0 || |
| 1004 | strncmp(name, "__stop_link_set_" , 16) == 0) { |
| 1005 | continue; |
| 1006 | } |
| 1007 | kobj_error(ko, "global symbol `%s' redefined" , |
| 1008 | name); |
| 1009 | error = ENOEXEC; |
| 1010 | } |
| 1011 | |
| 1012 | return error; |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * kobj_relocate: |
| 1017 | * |
| 1018 | * Resolve relocations for the loaded object. |
| 1019 | */ |
| 1020 | static int |
| 1021 | kobj_relocate(kobj_t ko, bool local) |
| 1022 | { |
| 1023 | const Elf_Rel *rellim; |
| 1024 | const Elf_Rel *rel; |
| 1025 | const Elf_Rela *relalim; |
| 1026 | const Elf_Rela *rela; |
| 1027 | const Elf_Sym *sym; |
| 1028 | uintptr_t base; |
| 1029 | int i, error; |
| 1030 | uintptr_t symidx; |
| 1031 | |
| 1032 | /* |
| 1033 | * Perform relocations without addend if there are any. |
| 1034 | */ |
| 1035 | for (i = 0; i < ko->ko_nrel; i++) { |
| 1036 | rel = ko->ko_reltab[i].rel; |
| 1037 | if (rel == NULL) { |
| 1038 | continue; |
| 1039 | } |
| 1040 | rellim = rel + ko->ko_reltab[i].nrel; |
| 1041 | base = kobj_findbase(ko, ko->ko_reltab[i].sec); |
| 1042 | if (base == 0) { |
| 1043 | panic("%s:%d: %s: lost base for e_reltab[%d] sec %d" , |
| 1044 | __func__, __LINE__, ko->ko_name, i, |
| 1045 | ko->ko_reltab[i].sec); |
| 1046 | } |
| 1047 | for (; rel < rellim; rel++) { |
| 1048 | symidx = ELF_R_SYM(rel->r_info); |
| 1049 | if (symidx >= ko->ko_symcnt) { |
| 1050 | continue; |
| 1051 | } |
| 1052 | sym = ko->ko_symtab + symidx; |
| 1053 | if (local != (ELF_ST_BIND(sym->st_info) == STB_LOCAL)) { |
| 1054 | continue; |
| 1055 | } |
| 1056 | error = kobj_reloc(ko, base, rel, false, local); |
| 1057 | if (error != 0) { |
| 1058 | return ENOENT; |
| 1059 | } |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | /* |
| 1064 | * Perform relocations with addend if there are any. |
| 1065 | */ |
| 1066 | for (i = 0; i < ko->ko_nrela; i++) { |
| 1067 | rela = ko->ko_relatab[i].rela; |
| 1068 | if (rela == NULL) { |
| 1069 | continue; |
| 1070 | } |
| 1071 | relalim = rela + ko->ko_relatab[i].nrela; |
| 1072 | base = kobj_findbase(ko, ko->ko_relatab[i].sec); |
| 1073 | if (base == 0) { |
| 1074 | panic("%s:%d: %s: lost base for e_relatab[%d] sec %d" , |
| 1075 | __func__, __LINE__, ko->ko_name, i, |
| 1076 | ko->ko_relatab[i].sec); |
| 1077 | } |
| 1078 | for (; rela < relalim; rela++) { |
| 1079 | symidx = ELF_R_SYM(rela->r_info); |
| 1080 | if (symidx >= ko->ko_symcnt) { |
| 1081 | continue; |
| 1082 | } |
| 1083 | sym = ko->ko_symtab + symidx; |
| 1084 | if (local != (ELF_ST_BIND(sym->st_info) == STB_LOCAL)) { |
| 1085 | continue; |
| 1086 | } |
| 1087 | error = kobj_reloc(ko, base, rela, true, local); |
| 1088 | if (error != 0) { |
| 1089 | return ENOENT; |
| 1090 | } |
| 1091 | } |
| 1092 | } |
| 1093 | |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * kobj_out: |
| 1099 | * |
| 1100 | * Utility function: log an error. |
| 1101 | */ |
| 1102 | static void |
| 1103 | kobj_out(const char *fname, int lnum, kobj_t ko, const char *fmt, ...) |
| 1104 | { |
| 1105 | va_list ap; |
| 1106 | |
| 1107 | printf("%s, %d: [%s]: linker error: " , fname, lnum, ko->ko_name); |
| 1108 | va_start(ap, fmt); |
| 1109 | vprintf(fmt, ap); |
| 1110 | va_end(ap); |
| 1111 | printf("\n" ); |
| 1112 | } |
| 1113 | |
| 1114 | static int |
| 1115 | kobj_read_mem(kobj_t ko, void **basep, size_t size, off_t off, |
| 1116 | bool allocate) |
| 1117 | { |
| 1118 | void *base = *basep; |
| 1119 | int error; |
| 1120 | |
| 1121 | KASSERT(ko->ko_source != NULL); |
| 1122 | |
| 1123 | if (ko->ko_memsize != -1 && off + size > ko->ko_memsize) { |
| 1124 | kobj_error(ko, "preloaded object short" ); |
| 1125 | error = EINVAL; |
| 1126 | base = NULL; |
| 1127 | } else if (allocate) { |
| 1128 | base = kmem_alloc(size, KM_SLEEP); |
| 1129 | error = 0; |
| 1130 | } else { |
| 1131 | error = 0; |
| 1132 | } |
| 1133 | |
| 1134 | if (error == 0) { |
| 1135 | /* Copy the section */ |
| 1136 | memcpy(base, (uint8_t *)ko->ko_source + off, size); |
| 1137 | } |
| 1138 | |
| 1139 | if (allocate && error != 0) { |
| 1140 | kmem_free(base, size); |
| 1141 | base = NULL; |
| 1142 | } |
| 1143 | |
| 1144 | if (allocate) |
| 1145 | *basep = base; |
| 1146 | |
| 1147 | return error; |
| 1148 | } |
| 1149 | |
| 1150 | /* |
| 1151 | * kobj_free: |
| 1152 | * |
| 1153 | * Utility function: free memory if it was allocated from the heap. |
| 1154 | */ |
| 1155 | static void |
| 1156 | kobj_free(kobj_t ko, void *base, size_t size) |
| 1157 | { |
| 1158 | |
| 1159 | kmem_free(base, size); |
| 1160 | } |
| 1161 | |
| 1162 | extern char module_base[]; |
| 1163 | |
| 1164 | void |
| 1165 | kobj_setname(kobj_t ko, const char *name) |
| 1166 | { |
| 1167 | const char *d = name, *dots = "" ; |
| 1168 | size_t len, dlen; |
| 1169 | |
| 1170 | for (char *s = module_base; *d == *s; d++, s++) |
| 1171 | continue; |
| 1172 | |
| 1173 | if (d == name) |
| 1174 | name = "" ; |
| 1175 | else |
| 1176 | name = "%M" ; |
| 1177 | dlen = strlen(d); |
| 1178 | len = dlen + strlen(name); |
| 1179 | if (len >= sizeof(ko->ko_name)) { |
| 1180 | len = (len - sizeof(ko->ko_name)) + 5; /* dots + NUL */ |
| 1181 | if (dlen >= len) { |
| 1182 | d += len; |
| 1183 | dots = "/..." ; |
| 1184 | } |
| 1185 | } |
| 1186 | snprintf(ko->ko_name, sizeof(ko->ko_name), "%s%s%s" , name, dots, d); |
| 1187 | } |
| 1188 | |
| 1189 | #else /* MODULAR */ |
| 1190 | |
| 1191 | int |
| 1192 | kobj_load_mem(kobj_t *kop, const char *name, void *base, ssize_t size) |
| 1193 | { |
| 1194 | |
| 1195 | return ENOSYS; |
| 1196 | } |
| 1197 | |
| 1198 | void |
| 1199 | kobj_unload(kobj_t ko) |
| 1200 | { |
| 1201 | |
| 1202 | panic("not modular" ); |
| 1203 | } |
| 1204 | |
| 1205 | int |
| 1206 | kobj_stat(kobj_t ko, vaddr_t *base, size_t *size) |
| 1207 | { |
| 1208 | |
| 1209 | return ENOSYS; |
| 1210 | } |
| 1211 | |
| 1212 | int |
| 1213 | kobj_affix(kobj_t ko, const char *name) |
| 1214 | { |
| 1215 | |
| 1216 | panic("not modular" ); |
| 1217 | } |
| 1218 | |
| 1219 | int |
| 1220 | kobj_find_section(kobj_t ko, const char *name, void **addr, size_t *size) |
| 1221 | { |
| 1222 | |
| 1223 | panic("not modular" ); |
| 1224 | } |
| 1225 | |
| 1226 | void |
| 1227 | kobj_setname(kobj_t ko, const char *name) |
| 1228 | { |
| 1229 | |
| 1230 | panic("not modular" ); |
| 1231 | } |
| 1232 | |
| 1233 | #endif /* MODULAR */ |
| 1234 | |