1 /* 2 * QEMU Executable loader 3 * 4 * Copyright (c) 2006 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 * 24 * Gunzip functionality in this file is derived from u-boot: 25 * 26 * (C) Copyright 2008 Semihalf 27 * 28 * (C) Copyright 2000-2005 29 * Wolfgang Denk, DENX Software Engineering, wd (at) denx.de. 30 * 31 * This program is free software; you can redistribute it and/or 32 * modify it under the terms of the GNU General Public License as 33 * published by the Free Software Foundation; either version 2 of 34 * the License, or (at your option) any later version. 35 * 36 * This program is distributed in the hope that it will be useful, 37 * but WITHOUT ANY WARRANTY; without even the implied warranty of 38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 39 * GNU General Public License for more details. 40 * 41 * You should have received a copy of the GNU General Public License along 42 * with this program; if not, write to the Free Software Foundation, Inc., 43 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 44 */ 45 46 #include "qemu-common.h" 47 #include "disas.h" 48 #include "sysemu.h" 49 #include "uboot_image.h" 50 51 #include <zlib.h> 52 53 /* return the size or -1 if error */ 54 int get_image_size(const char *filename) 55 { 56 int fd, size; 57 fd = open(filename, O_RDONLY | O_BINARY); 58 if (fd < 0) 59 return -1; 60 size = lseek(fd, 0, SEEK_END); 61 close(fd); 62 return size; 63 } 64 65 /* return the size or -1 if error */ 66 /* deprecated, because caller does not specify buffer size! */ 67 int load_image(const char *filename, uint8_t *addr) 68 { 69 int fd, size; 70 fd = open(filename, O_RDONLY | O_BINARY); 71 if (fd < 0) 72 return -1; 73 size = lseek(fd, 0, SEEK_END); 74 lseek(fd, 0, SEEK_SET); 75 if (read(fd, addr, size) != size) { 76 close(fd); 77 return -1; 78 } 79 close(fd); 80 return size; 81 } 82 83 /* return the amount read, just like fread. 0 may mean error or eof */ 84 int fread_targphys(target_phys_addr_t dst_addr, size_t nbytes, FILE *f) 85 { 86 uint8_t buf[4096]; 87 target_phys_addr_t dst_begin = dst_addr; 88 size_t want, did; 89 90 while (nbytes) { 91 want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes; 92 did = fread(buf, 1, want, f); 93 94 cpu_physical_memory_write_rom(dst_addr, buf, did); 95 dst_addr += did; 96 nbytes -= did; 97 if (did != want) 98 break; 99 } 100 return dst_addr - dst_begin; 101 } 102 103 /* returns 0 on error, 1 if ok */ 104 int fread_targphys_ok(target_phys_addr_t dst_addr, size_t nbytes, FILE *f) 105 { 106 return fread_targphys(dst_addr, nbytes, f) == nbytes; 107 } 108 109 /* read()-like version */ 110 int read_targphys(int fd, target_phys_addr_t dst_addr, size_t nbytes) 111 { 112 uint8_t buf[4096]; 113 target_phys_addr_t dst_begin = dst_addr; 114 size_t want, did; 115 116 while (nbytes) { 117 want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes; 118 did = read(fd, buf, want); 119 if (did != want) break; 120 121 cpu_physical_memory_write_rom(dst_addr, buf, did); 122 dst_addr += did; 123 nbytes -= did; 124 } 125 return dst_addr - dst_begin; 126 } 127 128 /* return the size or -1 if error */ 129 int load_image_targphys(const char *filename, 130 target_phys_addr_t addr, int max_sz) 131 { 132 FILE *f; 133 size_t got; 134 135 f = fopen(filename, "rb"); 136 if (!f) return -1; 137 138 got = fread_targphys(addr, max_sz, f); 139 if (ferror(f)) { fclose(f); return -1; } 140 fclose(f); 141 142 return got; 143 } 144 145 void pstrcpy_targphys(target_phys_addr_t dest, int buf_size, 146 const char *source) 147 { 148 static const uint8_t nul_byte = 0; 149 const char *nulp; 150 151 if (buf_size <= 0) return; 152 nulp = memchr(source, 0, buf_size); 153 if (nulp) { 154 cpu_physical_memory_write_rom(dest, (uint8_t *)source, 155 (nulp - source) + 1); 156 } else { 157 cpu_physical_memory_write_rom(dest, (uint8_t *)source, buf_size - 1); 158 cpu_physical_memory_write_rom(dest, &nul_byte, 1); 159 } 160 } 161 162 /* A.OUT loader */ 163 164 struct exec 165 { 166 uint32_t a_info; /* Use macros N_MAGIC, etc for access */ 167 uint32_t a_text; /* length of text, in bytes */ 168 uint32_t a_data; /* length of data, in bytes */ 169 uint32_t a_bss; /* length of uninitialized data area, in bytes */ 170 uint32_t a_syms; /* length of symbol table data in file, in bytes */ 171 uint32_t a_entry; /* start address */ 172 uint32_t a_trsize; /* length of relocation info for text, in bytes */ 173 uint32_t a_drsize; /* length of relocation info for data, in bytes */ 174 }; 175 176 #ifdef BSWAP_NEEDED 177 static void bswap_ahdr(struct exec *e) 178 { 179 bswap32s(&e->a_info); 180 bswap32s(&e->a_text); 181 bswap32s(&e->a_data); 182 bswap32s(&e->a_bss); 183 bswap32s(&e->a_syms); 184 bswap32s(&e->a_entry); 185 bswap32s(&e->a_trsize); 186 bswap32s(&e->a_drsize); 187 } 188 #else 189 #define bswap_ahdr(x) do { } while (0) 190 #endif 191 192 #define N_MAGIC(exec) ((exec).a_info & 0xffff) 193 #define OMAGIC 0407 194 #define NMAGIC 0410 195 #define ZMAGIC 0413 196 #define QMAGIC 0314 197 #define _N_HDROFF(x) (1024 - sizeof (struct exec)) 198 #define N_TXTOFF(x) \ 199 (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \ 200 (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec))) 201 #define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0) 202 #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1)) 203 204 #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text) 205 206 #define N_DATADDR(x) \ 207 (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \ 208 : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x)))) 209 210 211 int load_aout(const char *filename, target_phys_addr_t addr, int max_sz) 212 { 213 int fd, size, ret; 214 struct exec e; 215 uint32_t magic; 216 217 fd = open(filename, O_RDONLY | O_BINARY); 218 if (fd < 0) 219 return -1; 220 221 size = read(fd, &e, sizeof(e)); 222 if (size < 0) 223 goto fail; 224 225 bswap_ahdr(&e); 226 227 magic = N_MAGIC(e); 228 switch (magic) { 229 case ZMAGIC: 230 case QMAGIC: 231 case OMAGIC: 232 if (e.a_text + e.a_data > max_sz) 233 goto fail; 234 lseek(fd, N_TXTOFF(e), SEEK_SET); 235 size = read_targphys(fd, addr, e.a_text + e.a_data); 236 if (size < 0) 237 goto fail; 238 break; 239 case NMAGIC: 240 if (N_DATADDR(e) + e.a_data > max_sz) 241 goto fail; 242 lseek(fd, N_TXTOFF(e), SEEK_SET); 243 size = read_targphys(fd, addr, e.a_text); 244 if (size < 0) 245 goto fail; 246 ret = read_targphys(fd, addr + N_DATADDR(e), e.a_data); 247 if (ret < 0) 248 goto fail; 249 size += ret; 250 break; 251 default: 252 goto fail; 253 } 254 close(fd); 255 return size; 256 fail: 257 close(fd); 258 return -1; 259 } 260 261 /* ELF loader */ 262 263 static void *load_at(int fd, int offset, int size) 264 { 265 void *ptr; 266 if (lseek(fd, offset, SEEK_SET) < 0) 267 return NULL; 268 ptr = qemu_malloc(size); 269 if (read(fd, ptr, size) != size) { 270 qemu_free(ptr); 271 return NULL; 272 } 273 return ptr; 274 } 275 276 277 #define ELF_CLASS ELFCLASS32 278 #include "elf.h" 279 280 #define SZ 32 281 #define elf_word uint32_t 282 #define elf_sword int32_t 283 #define bswapSZs bswap32s 284 #include "elf_ops.h" 285 286 #undef elfhdr 287 #undef elf_phdr 288 #undef elf_shdr 289 #undef elf_sym 290 #undef elf_note 291 #undef elf_word 292 #undef elf_sword 293 #undef bswapSZs 294 #undef SZ 295 #define elfhdr elf64_hdr 296 #define elf_phdr elf64_phdr 297 #define elf_note elf64_note 298 #define elf_shdr elf64_shdr 299 #define elf_sym elf64_sym 300 #define elf_word uint64_t 301 #define elf_sword int64_t 302 #define bswapSZs bswap64s 303 #define SZ 64 304 #include "elf_ops.h" 305 306 /* return < 0 if error, otherwise the number of bytes loaded in memory */ 307 int load_elf(const char *filename, int64_t address_offset, 308 uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr) 309 { 310 int fd, data_order, host_data_order, must_swab, ret; 311 uint8_t e_ident[EI_NIDENT]; 312 313 fd = open(filename, O_RDONLY | O_BINARY); 314 if (fd < 0) { 315 perror(filename); 316 return -1; 317 } 318 if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident)) 319 goto fail; 320 if (e_ident[0] != ELFMAG0 || 321 e_ident[1] != ELFMAG1 || 322 e_ident[2] != ELFMAG2 || 323 e_ident[3] != ELFMAG3) 324 goto fail; 325 #ifdef HOST_WORDS_BIGENDIAN 326 data_order = ELFDATA2MSB; 327 #else 328 data_order = ELFDATA2LSB; 329 #endif 330 must_swab = data_order != e_ident[EI_DATA]; 331 332 #ifdef TARGET_WORDS_BIGENDIAN 333 host_data_order = ELFDATA2MSB; 334 #else 335 host_data_order = ELFDATA2LSB; 336 #endif 337 if (host_data_order != e_ident[EI_DATA]) 338 return -1; 339 340 lseek(fd, 0, SEEK_SET); 341 if (e_ident[EI_CLASS] == ELFCLASS64) { 342 ret = load_elf64(fd, address_offset, must_swab, pentry, 343 lowaddr, highaddr); 344 } else { 345 ret = load_elf32(fd, address_offset, must_swab, pentry, 346 lowaddr, highaddr); 347 } 348 349 close(fd); 350 return ret; 351 352 fail: 353 close(fd); 354 return -1; 355 } 356 357 static void bswap_uboot_header(uboot_image_header_t *hdr) 358 { 359 #ifndef HOST_WORDS_BIGENDIAN 360 bswap32s(&hdr->ih_magic); 361 bswap32s(&hdr->ih_hcrc); 362 bswap32s(&hdr->ih_time); 363 bswap32s(&hdr->ih_size); 364 bswap32s(&hdr->ih_load); 365 bswap32s(&hdr->ih_ep); 366 bswap32s(&hdr->ih_dcrc); 367 #endif 368 } 369 370 371 #define ZALLOC_ALIGNMENT 16 372 373 static void *zalloc(void *x, unsigned items, unsigned size) 374 { 375 void *p; 376 377 size *= items; 378 size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); 379 380 p = qemu_malloc(size); 381 382 return (p); 383 } 384 385 static void zfree(void *x, void *addr) 386 { 387 qemu_free(addr); 388 } 389 390 391 #define HEAD_CRC 2 392 #define EXTRA_FIELD 4 393 #define ORIG_NAME 8 394 #define COMMENT 0x10 395 #define RESERVED 0xe0 396 397 #define DEFLATED 8 398 399 /* This is the maximum in uboot, so if a uImage overflows this, it would 400 * overflow on real hardware too. */ 401 #define UBOOT_MAX_GUNZIP_BYTES 0x800000 402 403 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src, 404 size_t srclen) 405 { 406 z_stream s; 407 ssize_t dstbytes; 408 int r, i, flags; 409 410 /* skip header */ 411 i = 10; 412 flags = src[3]; 413 if (src[2] != DEFLATED || (flags & RESERVED) != 0) { 414 puts ("Error: Bad gzipped data\n"); 415 return -1; 416 } 417 if ((flags & EXTRA_FIELD) != 0) 418 i = 12 + src[10] + (src[11] << 8); 419 if ((flags & ORIG_NAME) != 0) 420 while (src[i++] != 0) 421 ; 422 if ((flags & COMMENT) != 0) 423 while (src[i++] != 0) 424 ; 425 if ((flags & HEAD_CRC) != 0) 426 i += 2; 427 if (i >= srclen) { 428 puts ("Error: gunzip out of data in header\n"); 429 return -1; 430 } 431 432 s.zalloc = zalloc; 433 s.zfree = zfree; 434 435 r = inflateInit2(&s, -MAX_WBITS); 436 if (r != Z_OK) { 437 printf ("Error: inflateInit2() returned %d\n", r); 438 return (-1); 439 } 440 s.next_in = src + i; 441 s.avail_in = srclen - i; 442 s.next_out = dst; 443 s.avail_out = dstlen; 444 r = inflate(&s, Z_FINISH); 445 if (r != Z_OK && r != Z_STREAM_END) { 446 printf ("Error: inflate() returned %d\n", r); 447 return -1; 448 } 449 dstbytes = s.next_out - (unsigned char *) dst; 450 inflateEnd(&s); 451 452 return dstbytes; 453 } 454 455 /* Load a U-Boot image. */ 456 int load_uimage(const char *filename, target_ulong *ep, target_ulong *loadaddr, 457 int *is_linux) 458 { 459 int fd; 460 int size; 461 uboot_image_header_t h; 462 uboot_image_header_t *hdr = &h; 463 uint8_t *data = NULL; 464 int ret = -1; 465 466 fd = open(filename, O_RDONLY | O_BINARY); 467 if (fd < 0) 468 return -1; 469 470 size = read(fd, hdr, sizeof(uboot_image_header_t)); 471 if (size < 0) 472 goto out; 473 474 bswap_uboot_header(hdr); 475 476 if (hdr->ih_magic != IH_MAGIC) 477 goto out; 478 479 /* TODO: Implement other image types. */ 480 if (hdr->ih_type != IH_TYPE_KERNEL) { 481 fprintf(stderr, "Can only load u-boot image type \"kernel\"\n"); 482 goto out; 483 } 484 485 switch (hdr->ih_comp) { 486 case IH_COMP_NONE: 487 case IH_COMP_GZIP: 488 break; 489 default: 490 fprintf(stderr, 491 "Unable to load u-boot images with compression type %d\n", 492 hdr->ih_comp); 493 goto out; 494 } 495 496 /* TODO: Check CPU type. */ 497 if (is_linux) { 498 if (hdr->ih_os == IH_OS_LINUX) 499 *is_linux = 1; 500 else 501 *is_linux = 0; 502 } 503 504 *ep = hdr->ih_ep; 505 data = qemu_malloc(hdr->ih_size); 506 507 if (read(fd, data, hdr->ih_size) != hdr->ih_size) { 508 fprintf(stderr, "Error reading file\n"); 509 goto out; 510 } 511 512 if (hdr->ih_comp == IH_COMP_GZIP) { 513 uint8_t *compressed_data; 514 size_t max_bytes; 515 ssize_t bytes; 516 517 compressed_data = data; 518 max_bytes = UBOOT_MAX_GUNZIP_BYTES; 519 data = qemu_malloc(max_bytes); 520 521 bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size); 522 qemu_free(compressed_data); 523 if (bytes < 0) { 524 fprintf(stderr, "Unable to decompress gzipped image!\n"); 525 goto out; 526 } 527 hdr->ih_size = bytes; 528 } 529 530 cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size); 531 532 if (loadaddr) 533 *loadaddr = hdr->ih_load; 534 535 ret = hdr->ih_size; 536 537 out: 538 if (data) 539 qemu_free(data); 540 close(fd); 541 return ret; 542 } 543
