loader.c

   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@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_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
 203 #define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1))
 204
 205 #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text)
 206
 207 #define N_DATADDR(x) \
 208     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
 209      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))
 210
 211
 212 int load_aout(const char *filename, target_phys_addr_t addr, int max_sz)
 213 {
 214     int fd, size, ret;
 215     struct exec e;
 216     uint32_t magic;
 217
 218     fd = open(filename, O_RDONLY | O_BINARY);
 219     if (fd < 0)
 220         return -1;
 221
 222     size = read(fd, &e, sizeof(e));
 223     if (size < 0)
 224         goto fail;
 225
 226     bswap_ahdr(&e);
 227
 228     magic = N_MAGIC(e);
 229     switch (magic) {
 230     case ZMAGIC:
 231     case QMAGIC:
 232     case OMAGIC:
 233         if (e.a_text + e.a_data > max_sz)
 234             goto fail;
 235         lseek(fd, N_TXTOFF(e), SEEK_SET);
 236         size = read_targphys(fd, addr, e.a_text + e.a_data);
 237         if (size < 0)
 238             goto fail;
 239         break;
 240     case NMAGIC:
 241         if (N_DATADDR(e) + e.a_data > max_sz)
 242             goto fail;
 243         lseek(fd, N_TXTOFF(e), SEEK_SET);
 244         size = read_targphys(fd, addr, e.a_text);
 245         if (size < 0)
 246             goto fail;
 247         ret = read_targphys(fd, addr + N_DATADDR(e), e.a_data);
 248         if (ret < 0)
 249             goto fail;
 250         size += ret;
 251         break;
 252     default:
 253         goto fail;
 254     }
 255     close(fd);
 256     return size;
 257  fail:
 258     close(fd);
 259     return -1;
 260 }
 261
 262 /* ELF loader */
 263
 264 static void *load_at(int fd, int offset, int size)
 265 {
 266     void *ptr;
 267     if (lseek(fd, offset, SEEK_SET) < 0)
 268         return NULL;
 269     ptr = qemu_malloc(size);
 270     if (read(fd, ptr, size) != size) {
 271         qemu_free(ptr);
 272         return NULL;
 273     }
 274     return ptr;
 275 }
 276
 277
 278 #define ELF_CLASS   ELFCLASS32
 279 #include "elf.h"
 280
 281 #define SZ              32
 282 #define elf_word        uint32_t
 283 #define elf_sword        int32_t
 284 #define bswapSZs        bswap32s
 285 #include "elf_ops.h"
 286
 287 #undef elfhdr
 288 #undef elf_phdr
 289 #undef elf_shdr
 290 #undef elf_sym
 291 #undef elf_note
 292 #undef elf_word
 293 #undef elf_sword
 294 #undef bswapSZs
 295 #undef SZ
 296 #define elfhdr          elf64_hdr
 297 #define elf_phdr        elf64_phdr
 298 #define elf_note        elf64_note
 299 #define elf_shdr        elf64_shdr
 300 #define elf_sym         elf64_sym
 301 #define elf_word        uint64_t
 302 #define elf_sword        int64_t
 303 #define bswapSZs        bswap64s
 304 #define SZ              64
 305 #include "elf_ops.h"
 306
 307 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 308 int load_elf(const char *filename, int64_t address_offset,
 309              uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr)
 310 {
 311     int fd, data_order, host_data_order, must_swab, ret;
 312     uint8_t e_ident[EI_NIDENT];
 313
 314     fd = open(filename, O_RDONLY | O_BINARY);
 315     if (fd < 0) {
 316         perror(filename);
 317         return -1;
 318     }
 319     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 320         goto fail;
 321     if (e_ident[0] != ELFMAG0 ||
 322         e_ident[1] != ELFMAG1 ||
 323         e_ident[2] != ELFMAG2 ||
 324         e_ident[3] != ELFMAG3)
 325         goto fail;
 326 #ifdef WORDS_BIGENDIAN
 327     data_order = ELFDATA2MSB;
 328 #else
 329     data_order = ELFDATA2LSB;
 330 #endif
 331     must_swab = data_order != e_ident[EI_DATA];
 332
 333 #ifdef TARGET_WORDS_BIGENDIAN
 334     host_data_order = ELFDATA2MSB;
 335 #else
 336     host_data_order = ELFDATA2LSB;
 337 #endif
 338     if (host_data_order != e_ident[EI_DATA])
 339         return -1;
 340
 341     lseek(fd, 0, SEEK_SET);
 342     if (e_ident[EI_CLASS] == ELFCLASS64) {
 343         ret = load_elf64(fd, address_offset, must_swab, pentry,
 344                          lowaddr, highaddr);
 345     } else {
 346         ret = load_elf32(fd, address_offset, must_swab, pentry,
 347                          lowaddr, highaddr);
 348     }
 349
 350     close(fd);
 351     return ret;
 352
 353  fail:
 354     close(fd);
 355     return -1;
 356 }
 357
 358 static void bswap_uboot_header(uboot_image_header_t *hdr)
 359 {
 360 #ifndef WORDS_BIGENDIAN
 361     bswap32s(&hdr->ih_magic);
 362     bswap32s(&hdr->ih_hcrc);
 363     bswap32s(&hdr->ih_time);
 364     bswap32s(&hdr->ih_size);
 365     bswap32s(&hdr->ih_load);
 366     bswap32s(&hdr->ih_ep);
 367     bswap32s(&hdr->ih_dcrc);
 368 #endif
 369 }
 370
 371
 372 #define ZALLOC_ALIGNMENT        16
 373
 374 static void *zalloc(void *x, unsigned items, unsigned size)
 375 {
 376     void *p;
 377
 378     size *= items;
 379     size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
 380
 381     p = qemu_malloc(size);
 382
 383     return (p);
 384 }
 385
 386 static void zfree(void *x, void *addr, unsigned nb)
 387 {
 388     qemu_free(addr);
 389 }
 390
 391
 392 #define HEAD_CRC        2
 393 #define EXTRA_FIELD     4
 394 #define ORIG_NAME       8
 395 #define COMMENT         0x10
 396 #define RESERVED        0xe0
 397
 398 #define DEFLATED        8
 399
 400 /* This is the maximum in uboot, so if a uImage overflows this, it would
 401  * overflow on real hardware too. */
 402 #define UBOOT_MAX_GUNZIP_BYTES 0x800000
 403
 404 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
 405                       size_t srclen)
 406 {
 407     z_stream s;
 408     ssize_t dstbytes;
 409     int r, i, flags;
 410
 411     /* skip header */
 412     i = 10;
 413     flags = src[3];
 414     if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 415         puts ("Error: Bad gzipped data\n");
 416         return -1;
 417     }
 418     if ((flags & EXTRA_FIELD) != 0)
 419         i = 12 + src[10] + (src[11] << 8);
 420     if ((flags & ORIG_NAME) != 0)
 421         while (src[i++] != 0)
 422             ;
 423     if ((flags & COMMENT) != 0)
 424         while (src[i++] != 0)
 425             ;
 426     if ((flags & HEAD_CRC) != 0)
 427         i += 2;
 428     if (i >= srclen) {
 429         puts ("Error: gunzip out of data in header\n");
 430         return -1;
 431     }
 432
 433     s.zalloc = zalloc;
 434     s.zfree = (free_func)zfree;
 435
 436     r = inflateInit2(&s, -MAX_WBITS);
 437     if (r != Z_OK) {
 438         printf ("Error: inflateInit2() returned %d\n", r);
 439         return (-1);
 440     }
 441     s.next_in = src + i;
 442     s.avail_in = srclen - i;
 443     s.next_out = dst;
 444     s.avail_out = dstlen;
 445     r = inflate(&s, Z_FINISH);
 446     if (r != Z_OK && r != Z_STREAM_END) {
 447         printf ("Error: inflate() returned %d\n", r);
 448         return -1;
 449     }
 450     dstbytes = s.next_out - (unsigned char *) dst;
 451     inflateEnd(&s);
 452
 453     return dstbytes;
 454 }
 455
 456 /* Load a U-Boot image.  */
 457 int load_uimage(const char *filename, target_ulong *ep, target_ulong *loadaddr,
 458                 int *is_linux)
 459 {
 460     int fd;
 461     int size;
 462     uboot_image_header_t h;
 463     uboot_image_header_t *hdr = &h;
 464     uint8_t *data = NULL;
 465     int ret = -1;
 466
 467     fd = open(filename, O_RDONLY | O_BINARY);
 468     if (fd < 0)
 469         return -1;
 470
 471     size = read(fd, hdr, sizeof(uboot_image_header_t));
 472     if (size < 0)
 473         goto out;
 474
 475     bswap_uboot_header(hdr);
 476
 477     if (hdr->ih_magic != IH_MAGIC)
 478         goto out;
 479
 480     /* TODO: Implement other image types.  */
 481     if (hdr->ih_type != IH_TYPE_KERNEL) {
 482         fprintf(stderr, "Can only load u-boot image type \"kernel\"\n");
 483         goto out;
 484     }
 485
 486     switch (hdr->ih_comp) {
 487     case IH_COMP_NONE:
 488     case IH_COMP_GZIP:
 489         break;
 490     default:
 491         fprintf(stderr,
 492                 "Unable to load u-boot images with compression type %d\n",
 493                 hdr->ih_comp);
 494         goto out;
 495     }
 496
 497     /* TODO: Check CPU type.  */
 498     if (is_linux) {
 499         if (hdr->ih_os == IH_OS_LINUX)
 500             *is_linux = 1;
 501         else
 502             *is_linux = 0;
 503     }
 504
 505     *ep = hdr->ih_ep;
 506     data = qemu_malloc(hdr->ih_size);
 507
 508     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 509         fprintf(stderr, "Error reading file\n");
 510         goto out;
 511     }
 512
 513     if (hdr->ih_comp == IH_COMP_GZIP) {
 514         uint8_t *compressed_data;
 515         size_t max_bytes;
 516         ssize_t bytes;
 517
 518         compressed_data = data;
 519         max_bytes = UBOOT_MAX_GUNZIP_BYTES;
 520         data = qemu_malloc(max_bytes);
 521
 522         bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
 523         qemu_free(compressed_data);
 524         if (bytes < 0) {
 525             fprintf(stderr, "Unable to decompress gzipped image!\n");
 526             goto out;
 527         }
 528         hdr->ih_size = bytes;
 529     }
 530
 531     cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
 532
 533     if (loadaddr)
 534         *loadaddr = hdr->ih_load;
 535
 536     ret = hdr->ih_size;
 537
 538 out:
 539     if (data)
 540         qemu_free(data);
 541     close(fd);
 542     return ret;
 543 }