hw/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, see <http://www.gnu.org/licenses/>.
  43  */
  44
  45 #include "hw.h"
  46 #include "disas.h"
  47 #include "monitor.h"
  48 #include "sysemu.h"
  49 #include "uboot_image.h"
  50 #include "loader.h"
  51 #include "fw_cfg.h"
  52
  53 #include <zlib.h>
  54
  55 static int roms_loaded;
  56
  57 /* return the size or -1 if error */
  58 int get_image_size(const char *filename)
  59 {
  60     int fd, size;
  61     fd = open(filename, O_RDONLY | O_BINARY);
  62     if (fd < 0)
  63         return -1;
  64     size = lseek(fd, 0, SEEK_END);
  65     close(fd);
  66     return size;
  67 }
  68
  69 /* return the size or -1 if error */
  70 /* deprecated, because caller does not specify buffer size! */
  71 int load_image(const char *filename, uint8_t *addr)
  72 {
  73     int fd, size;
  74     fd = open(filename, O_RDONLY | O_BINARY);
  75     if (fd < 0)
  76         return -1;
  77     size = lseek(fd, 0, SEEK_END);
  78     lseek(fd, 0, SEEK_SET);
  79     if (read(fd, addr, size) != size) {
  80         close(fd);
  81         return -1;
  82     }
  83     close(fd);
  84     return size;
  85 }
  86
  87 /* read()-like version */
  88 int read_targphys(const char *name,
  89                   int fd, target_phys_addr_t dst_addr, size_t nbytes)
  90 {
  91     uint8_t *buf;
  92     size_t did;
  93
  94     buf = qemu_malloc(nbytes);
  95     did = read(fd, buf, nbytes);
  96     if (did > 0)
  97         rom_add_blob_fixed("read", buf, did, dst_addr);
  98     qemu_free(buf);
  99     return did;
 100 }
 101
 102 /* return the size or -1 if error */
 103 int load_image_targphys(const char *filename,
 104                         target_phys_addr_t addr, int max_sz)
 105 {
 106     int size;
 107
 108     size = get_image_size(filename);
 109     if (size > 0)
 110         rom_add_file_fixed(filename, addr, -1);
 111     return size;
 112 }
 113
 114 void pstrcpy_targphys(const char *name, target_phys_addr_t dest, int buf_size,
 115                       const char *source)
 116 {
 117     const char *nulp;
 118     char *ptr;
 119
 120     if (buf_size <= 0) return;
 121     nulp = memchr(source, 0, buf_size);
 122     if (nulp) {
 123         rom_add_blob_fixed(name, source, (nulp - source) + 1, dest);
 124     } else {
 125         rom_add_blob_fixed(name, source, buf_size, dest);
 126         ptr = rom_ptr(dest + buf_size - 1);
 127         *ptr = 0;
 128     }
 129 }
 130
 131 /* A.OUT loader */
 132
 133 struct exec
 134 {
 135   uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
 136   uint32_t a_text;   /* length of text, in bytes */
 137   uint32_t a_data;   /* length of data, in bytes */
 138   uint32_t a_bss;    /* length of uninitialized data area, in bytes */
 139   uint32_t a_syms;   /* length of symbol table data in file, in bytes */
 140   uint32_t a_entry;  /* start address */
 141   uint32_t a_trsize; /* length of relocation info for text, in bytes */
 142   uint32_t a_drsize; /* length of relocation info for data, in bytes */
 143 };
 144
 145 static void bswap_ahdr(struct exec *e)
 146 {
 147     bswap32s(&e->a_info);
 148     bswap32s(&e->a_text);
 149     bswap32s(&e->a_data);
 150     bswap32s(&e->a_bss);
 151     bswap32s(&e->a_syms);
 152     bswap32s(&e->a_entry);
 153     bswap32s(&e->a_trsize);
 154     bswap32s(&e->a_drsize);
 155 }
 156
 157 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
 158 #define OMAGIC 0407
 159 #define NMAGIC 0410
 160 #define ZMAGIC 0413
 161 #define QMAGIC 0314
 162 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
 163 #define N_TXTOFF(x)                                                     \
 164     (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :     \
 165      (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
 166 #define N_TXTADDR(x, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0)
 167 #define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1))
 168
 169 #define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text)
 170
 171 #define N_DATADDR(x, target_page_size) \
 172     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \
 173      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size)))
 174
 175
 176 int load_aout(const char *filename, target_phys_addr_t addr, int max_sz,
 177               int bswap_needed, target_phys_addr_t target_page_size)
 178 {
 179     int fd, size, ret;
 180     struct exec e;
 181     uint32_t magic;
 182
 183     fd = open(filename, O_RDONLY | O_BINARY);
 184     if (fd < 0)
 185         return -1;
 186
 187     size = read(fd, &e, sizeof(e));
 188     if (size < 0)
 189         goto fail;
 190
 191     if (bswap_needed) {
 192         bswap_ahdr(&e);
 193     }
 194
 195     magic = N_MAGIC(e);
 196     switch (magic) {
 197     case ZMAGIC:
 198     case QMAGIC:
 199     case OMAGIC:
 200         if (e.a_text + e.a_data > max_sz)
 201             goto fail;
 202         lseek(fd, N_TXTOFF(e), SEEK_SET);
 203         size = read_targphys(filename, fd, addr, e.a_text + e.a_data);
 204         if (size < 0)
 205             goto fail;
 206         break;
 207     case NMAGIC:
 208         if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
 209             goto fail;
 210         lseek(fd, N_TXTOFF(e), SEEK_SET);
 211         size = read_targphys(filename, fd, addr, e.a_text);
 212         if (size < 0)
 213             goto fail;
 214         ret = read_targphys(filename, fd, addr + N_DATADDR(e, target_page_size),
 215                             e.a_data);
 216         if (ret < 0)
 217             goto fail;
 218         size += ret;
 219         break;
 220     default:
 221         goto fail;
 222     }
 223     close(fd);
 224     return size;
 225  fail:
 226     close(fd);
 227     return -1;
 228 }
 229
 230 /* ELF loader */
 231
 232 static void *load_at(int fd, int offset, int size)
 233 {
 234     void *ptr;
 235     if (lseek(fd, offset, SEEK_SET) < 0)
 236         return NULL;
 237     ptr = qemu_malloc(size);
 238     if (read(fd, ptr, size) != size) {
 239         qemu_free(ptr);
 240         return NULL;
 241     }
 242     return ptr;
 243 }
 244
 245 #ifdef ELF_CLASS
 246 #undef ELF_CLASS
 247 #endif
 248
 249 #define ELF_CLASS   ELFCLASS32
 250 #include "elf.h"
 251
 252 #define SZ              32
 253 #define elf_word        uint32_t
 254 #define elf_sword        int32_t
 255 #define bswapSZs        bswap32s
 256 #include "elf_ops.h"
 257
 258 #undef elfhdr
 259 #undef elf_phdr
 260 #undef elf_shdr
 261 #undef elf_sym
 262 #undef elf_note
 263 #undef elf_word
 264 #undef elf_sword
 265 #undef bswapSZs
 266 #undef SZ
 267 #define elfhdr          elf64_hdr
 268 #define elf_phdr        elf64_phdr
 269 #define elf_note        elf64_note
 270 #define elf_shdr        elf64_shdr
 271 #define elf_sym         elf64_sym
 272 #define elf_word        uint64_t
 273 #define elf_sword        int64_t
 274 #define bswapSZs        bswap64s
 275 #define SZ              64
 276 #include "elf_ops.h"
 277
 278 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 279 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
 280              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
 281              uint64_t *highaddr, int big_endian, int elf_machine, int clear_lsb)
 282 {
 283     int fd, data_order, target_data_order, must_swab, ret;
 284     uint8_t e_ident[EI_NIDENT];
 285
 286     fd = open(filename, O_RDONLY | O_BINARY);
 287     if (fd < 0) {
 288         perror(filename);
 289         return -1;
 290     }
 291     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 292         goto fail;
 293     if (e_ident[0] != ELFMAG0 ||
 294         e_ident[1] != ELFMAG1 ||
 295         e_ident[2] != ELFMAG2 ||
 296         e_ident[3] != ELFMAG3)
 297         goto fail;
 298 #ifdef HOST_WORDS_BIGENDIAN
 299     data_order = ELFDATA2MSB;
 300 #else
 301     data_order = ELFDATA2LSB;
 302 #endif
 303     must_swab = data_order != e_ident[EI_DATA];
 304     if (big_endian) {
 305         target_data_order = ELFDATA2MSB;
 306     } else {
 307         target_data_order = ELFDATA2LSB;
 308     }
 309
 310     if (target_data_order != e_ident[EI_DATA])
 311         return -1;
 312
 313     lseek(fd, 0, SEEK_SET);
 314     if (e_ident[EI_CLASS] == ELFCLASS64) {
 315         ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
 316                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 317     } else {
 318         ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
 319                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 320     }
 321
 322     close(fd);
 323     return ret;
 324
 325  fail:
 326     close(fd);
 327     return -1;
 328 }
 329
 330 static void bswap_uboot_header(uboot_image_header_t *hdr)
 331 {
 332 #ifndef HOST_WORDS_BIGENDIAN
 333     bswap32s(&hdr->ih_magic);
 334     bswap32s(&hdr->ih_hcrc);
 335     bswap32s(&hdr->ih_time);
 336     bswap32s(&hdr->ih_size);
 337     bswap32s(&hdr->ih_load);
 338     bswap32s(&hdr->ih_ep);
 339     bswap32s(&hdr->ih_dcrc);
 340 #endif
 341 }
 342
 343
 344 #define ZALLOC_ALIGNMENT        16
 345
 346 static void *zalloc(void *x, unsigned items, unsigned size)
 347 {
 348     void *p;
 349
 350     size *= items;
 351     size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
 352
 353     p = qemu_malloc(size);
 354
 355     return (p);
 356 }
 357
 358 static void zfree(void *x, void *addr)
 359 {
 360     qemu_free(addr);
 361 }
 362
 363
 364 #define HEAD_CRC        2
 365 #define EXTRA_FIELD     4
 366 #define ORIG_NAME       8
 367 #define COMMENT         0x10
 368 #define RESERVED        0xe0
 369
 370 #define DEFLATED        8
 371
 372 /* This is the maximum in uboot, so if a uImage overflows this, it would
 373  * overflow on real hardware too. */
 374 #define UBOOT_MAX_GUNZIP_BYTES 0x800000
 375
 376 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
 377                       size_t srclen)
 378 {
 379     z_stream s;
 380     ssize_t dstbytes;
 381     int r, i, flags;
 382
 383     /* skip header */
 384     i = 10;
 385     flags = src[3];
 386     if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 387         puts ("Error: Bad gzipped data\n");
 388         return -1;
 389     }
 390     if ((flags & EXTRA_FIELD) != 0)
 391         i = 12 + src[10] + (src[11] << 8);
 392     if ((flags & ORIG_NAME) != 0)
 393         while (src[i++] != 0)
 394             ;
 395     if ((flags & COMMENT) != 0)
 396         while (src[i++] != 0)
 397             ;
 398     if ((flags & HEAD_CRC) != 0)
 399         i += 2;
 400     if (i >= srclen) {
 401         puts ("Error: gunzip out of data in header\n");
 402         return -1;
 403     }
 404
 405     s.zalloc = zalloc;
 406     s.zfree = zfree;
 407
 408     r = inflateInit2(&s, -MAX_WBITS);
 409     if (r != Z_OK) {
 410         printf ("Error: inflateInit2() returned %d\n", r);
 411         return (-1);
 412     }
 413     s.next_in = src + i;
 414     s.avail_in = srclen - i;
 415     s.next_out = dst;
 416     s.avail_out = dstlen;
 417     r = inflate(&s, Z_FINISH);
 418     if (r != Z_OK && r != Z_STREAM_END) {
 419         printf ("Error: inflate() returned %d\n", r);
 420         return -1;
 421     }
 422     dstbytes = s.next_out - (unsigned char *) dst;
 423     inflateEnd(&s);
 424
 425     return dstbytes;
 426 }
 427
 428 /* Load a U-Boot image.  */
 429 int load_uimage(const char *filename, target_phys_addr_t *ep,
 430                 target_phys_addr_t *loadaddr, int *is_linux)
 431 {
 432     int fd;
 433     int size;
 434     uboot_image_header_t h;
 435     uboot_image_header_t *hdr = &h;
 436     uint8_t *data = NULL;
 437     int ret = -1;
 438
 439     fd = open(filename, O_RDONLY | O_BINARY);
 440     if (fd < 0)
 441         return -1;
 442
 443     size = read(fd, hdr, sizeof(uboot_image_header_t));
 444     if (size < 0)
 445         goto out;
 446
 447     bswap_uboot_header(hdr);
 448
 449     if (hdr->ih_magic != IH_MAGIC)
 450         goto out;
 451
 452     /* TODO: Implement other image types.  */
 453     if (hdr->ih_type != IH_TYPE_KERNEL) {
 454         fprintf(stderr, "Can only load u-boot image type \"kernel\"\n");
 455         goto out;
 456     }
 457
 458     switch (hdr->ih_comp) {
 459     case IH_COMP_NONE:
 460     case IH_COMP_GZIP:
 461         break;
 462     default:
 463         fprintf(stderr,
 464                 "Unable to load u-boot images with compression type %d\n",
 465                 hdr->ih_comp);
 466         goto out;
 467     }
 468
 469     /* TODO: Check CPU type.  */
 470     if (is_linux) {
 471         if (hdr->ih_os == IH_OS_LINUX)
 472             *is_linux = 1;
 473         else
 474             *is_linux = 0;
 475     }
 476
 477     *ep = hdr->ih_ep;
 478     data = qemu_malloc(hdr->ih_size);
 479
 480     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 481         fprintf(stderr, "Error reading file\n");
 482         goto out;
 483     }
 484
 485     if (hdr->ih_comp == IH_COMP_GZIP) {
 486         uint8_t *compressed_data;
 487         size_t max_bytes;
 488         ssize_t bytes;
 489
 490         compressed_data = data;
 491         max_bytes = UBOOT_MAX_GUNZIP_BYTES;
 492         data = qemu_malloc(max_bytes);
 493
 494         bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
 495         qemu_free(compressed_data);
 496         if (bytes < 0) {
 497             fprintf(stderr, "Unable to decompress gzipped image!\n");
 498             goto out;
 499         }
 500         hdr->ih_size = bytes;
 501     }
 502
 503     rom_add_blob_fixed(filename, data, hdr->ih_size, hdr->ih_load);
 504
 505     if (loadaddr)
 506         *loadaddr = hdr->ih_load;
 507
 508     ret = hdr->ih_size;
 509
 510 out:
 511     if (data)
 512         qemu_free(data);
 513     close(fd);
 514     return ret;
 515 }
 516
 517 /*
 518  * Functions for reboot-persistent memory regions.
 519  *  - used for vga bios and option roms.
 520  *  - also linux kernel (-kernel / -initrd).
 521  */
 522
 523 typedef struct Rom Rom;
 524
 525 struct Rom {
 526     char *name;
 527     char *path;
 528     size_t romsize;
 529     uint8_t *data;
 530     int isrom;
 531     char *fw_dir;
 532     char *fw_file;
 533
 534     target_phys_addr_t addr;
 535     QTAILQ_ENTRY(Rom) next;
 536 };
 537
 538 static FWCfgState *fw_cfg;
 539 static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
 540
 541 static void rom_insert(Rom *rom)
 542 {
 543     Rom *item;
 544
 545     if (roms_loaded) {
 546         hw_error ("ROM images must be loaded at startup\n");
 547     }
 548
 549     /* list is ordered by load address */
 550     QTAILQ_FOREACH(item, &roms, next) {
 551         if (rom->addr >= item->addr)
 552             continue;
 553         QTAILQ_INSERT_BEFORE(item, rom, next);
 554         return;
 555     }
 556     QTAILQ_INSERT_TAIL(&roms, rom, next);
 557 }
 558
 559 int rom_add_file(const char *file, const char *fw_dir,
 560                  target_phys_addr_t addr, int32_t bootindex)
 561 {
 562     Rom *rom;
 563     int rc, fd = -1;
 564     char devpath[100];
 565
 566     rom = qemu_mallocz(sizeof(*rom));
 567     rom->name = qemu_strdup(file);
 568     rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
 569     if (rom->path == NULL) {
 570         rom->path = qemu_strdup(file);
 571     }
 572
 573     fd = open(rom->path, O_RDONLY | O_BINARY);
 574     if (fd == -1) {
 575         fprintf(stderr, "Could not open option rom '%s': %s\n",
 576                 rom->path, strerror(errno));
 577         goto err;
 578     }
 579
 580     if (fw_dir) {
 581         rom->fw_dir  = qemu_strdup(fw_dir);
 582         rom->fw_file = qemu_strdup(file);
 583     }
 584     rom->addr    = addr;
 585     rom->romsize = lseek(fd, 0, SEEK_END);
 586     rom->data    = qemu_mallocz(rom->romsize);
 587     lseek(fd, 0, SEEK_SET);
 588     rc = read(fd, rom->data, rom->romsize);
 589     if (rc != rom->romsize) {
 590         fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
 591                 rom->name, rc, rom->romsize);
 592         goto err;
 593     }
 594     close(fd);
 595     rom_insert(rom);
 596     if (rom->fw_file && fw_cfg) {
 597         const char *basename;
 598         char fw_file_name[56];
 599
 600         basename = strrchr(rom->fw_file, '/');
 601         if (basename) {
 602             basename++;
 603         } else {
 604             basename = rom->fw_file;
 605         }
 606         snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
 607                  basename);
 608         fw_cfg_add_file(fw_cfg, fw_file_name, rom->data, rom->romsize);
 609         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
 610     } else {
 611         snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
 612     }
 613
 614     add_boot_device_path(bootindex, NULL, devpath);
 615     return 0;
 616
 617 err:
 618     if (fd != -1)
 619         close(fd);
 620     qemu_free(rom->data);
 621     qemu_free(rom->path);
 622     qemu_free(rom->name);
 623     qemu_free(rom);
 624     return -1;
 625 }
 626
 627 int rom_add_blob(const char *name, const void *blob, size_t len,
 628                  target_phys_addr_t addr)
 629 {
 630     Rom *rom;
 631
 632     rom = qemu_mallocz(sizeof(*rom));
 633     rom->name    = qemu_strdup(name);
 634     rom->addr    = addr;
 635     rom->romsize = len;
 636     rom->data    = qemu_mallocz(rom->romsize);
 637     memcpy(rom->data, blob, len);
 638     rom_insert(rom);
 639     return 0;
 640 }
 641
 642 int rom_add_vga(const char *file)
 643 {
 644     return rom_add_file(file, "vgaroms", 0, -1);
 645 }
 646
 647 int rom_add_option(const char *file, int32_t bootindex)
 648 {
 649     return rom_add_file(file, "genroms", 0, bootindex);
 650 }
 651
 652 static void rom_reset(void *unused)
 653 {
 654     Rom *rom;
 655
 656     QTAILQ_FOREACH(rom, &roms, next) {
 657         if (rom->fw_file) {
 658             continue;
 659         }
 660         if (rom->data == NULL) {
 661             continue;
 662         }
 663         cpu_physical_memory_write_rom(rom->addr, rom->data, rom->romsize);
 664         if (rom->isrom) {
 665             /* rom needs to be written only once */
 666             qemu_free(rom->data);
 667             rom->data = NULL;
 668         }
 669     }
 670 }
 671
 672 int rom_load_all(void)
 673 {
 674     target_phys_addr_t addr = 0;
 675     int memtype;
 676     Rom *rom;
 677
 678     QTAILQ_FOREACH(rom, &roms, next) {
 679         if (rom->fw_file) {
 680             continue;
 681         }
 682         if (addr > rom->addr) {
 683             fprintf(stderr, "rom: requested regions overlap "
 684                     "(rom %s. free=0x" TARGET_FMT_plx
 685                     ", addr=0x" TARGET_FMT_plx ")\n",
 686                     rom->name, addr, rom->addr);
 687             return -1;
 688         }
 689         addr  = rom->addr;
 690         addr += rom->romsize;
 691         memtype = cpu_get_physical_page_desc(rom->addr) & (3 << IO_MEM_SHIFT);
 692         if (memtype == IO_MEM_ROM)
 693             rom->isrom = 1;
 694     }
 695     qemu_register_reset(rom_reset, NULL);
 696     roms_loaded = 1;
 697     return 0;
 698 }
 699
 700 void rom_set_fw(void *f)
 701 {
 702     fw_cfg = f;
 703 }
 704
 705 static Rom *find_rom(target_phys_addr_t addr)
 706 {
 707     Rom *rom;
 708
 709     QTAILQ_FOREACH(rom, &roms, next) {
 710         if (rom->fw_file) {
 711             continue;
 712         }
 713         if (rom->addr > addr) {
 714             continue;
 715         }
 716         if (rom->addr + rom->romsize < addr) {
 717             continue;
 718         }
 719         return rom;
 720     }
 721     return NULL;
 722 }
 723
 724 /*
 725  * Copies memory from registered ROMs to dest. Any memory that is contained in
 726  * a ROM between addr and addr + size is copied. Note that this can involve
 727  * multiple ROMs, which need not start at addr and need not end at addr + size.
 728  */
 729 int rom_copy(uint8_t *dest, target_phys_addr_t addr, size_t size)
 730 {
 731     target_phys_addr_t end = addr + size;
 732     uint8_t *s, *d = dest;
 733     size_t l = 0;
 734     Rom *rom;
 735
 736     QTAILQ_FOREACH(rom, &roms, next) {
 737         if (rom->fw_file) {
 738             continue;
 739         }
 740         if (rom->addr + rom->romsize < addr) {
 741             continue;
 742         }
 743         if (rom->addr > end) {
 744             break;
 745         }
 746         if (!rom->data) {
 747             continue;
 748         }
 749
 750         d = dest + (rom->addr - addr);
 751         s = rom->data;
 752         l = rom->romsize;
 753
 754         if ((d + l) > (dest + size)) {
 755             l = dest - d;
 756         }
 757
 758         memcpy(d, s, l);
 759     }
 760
 761     return (d + l) - dest;
 762 }
 763
 764 void *rom_ptr(target_phys_addr_t addr)
 765 {
 766     Rom *rom;
 767
 768     rom = find_rom(addr);
 769     if (!rom || !rom->data)
 770         return NULL;
 771     return rom->data + (addr - rom->addr);
 772 }
 773
 774 void do_info_roms(Monitor *mon)
 775 {
 776     Rom *rom;
 777
 778     QTAILQ_FOREACH(rom, &roms, next) {
 779         if (!rom->fw_file) {
 780             monitor_printf(mon, "addr=" TARGET_FMT_plx
 781                            " size=0x%06zx mem=%s name=\"%s\" \n",
 782                            rom->addr, rom->romsize,
 783                            rom->isrom ? "rom" : "ram",
 784                            rom->name);
 785         } else {
 786             monitor_printf(mon, "fw=%s/%s"
 787                            " size=0x%06zx name=\"%s\" \n",
 788                            rom->fw_dir,
 789                            rom->fw_file,
 790                            rom->romsize,
 791                            rom->name);
 792         }
 793     }
 794 }