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/disas.h"
  47 #include "monitor/monitor.h"
  48 #include "sysemu/sysemu.h"
  49 #include "uboot_image.h"
  50 #include "loader.h"
  51 #include "fw_cfg.h"
  52 #include "exec/memory.h"
  53 #include "exec/address-spaces.h"
  54
  55 #include <zlib.h>
  56
  57 static int roms_loaded;
  58
  59 /* return the size or -1 if error */
  60 int get_image_size(const char *filename)
  61 {
  62     int fd, size;
  63     fd = open(filename, O_RDONLY | O_BINARY);
  64     if (fd < 0)
  65         return -1;
  66     size = lseek(fd, 0, SEEK_END);
  67     close(fd);
  68     return size;
  69 }
  70
  71 /* return the size or -1 if error */
  72 /* deprecated, because caller does not specify buffer size! */
  73 int load_image(const char *filename, uint8_t *addr)
  74 {
  75     int fd, size;
  76     fd = open(filename, O_RDONLY | O_BINARY);
  77     if (fd < 0)
  78         return -1;
  79     size = lseek(fd, 0, SEEK_END);
  80     lseek(fd, 0, SEEK_SET);
  81     if (read(fd, addr, size) != size) {
  82         close(fd);
  83         return -1;
  84     }
  85     close(fd);
  86     return size;
  87 }
  88
  89 /* read()-like version */
  90 ssize_t read_targphys(const char *name,
  91                       int fd, hwaddr dst_addr, size_t nbytes)
  92 {
  93     uint8_t *buf;
  94     ssize_t did;
  95
  96     buf = g_malloc(nbytes);
  97     did = read(fd, buf, nbytes);
  98     if (did > 0)
  99         rom_add_blob_fixed("read", buf, did, dst_addr);
 100     g_free(buf);
 101     return did;
 102 }
 103
 104 /* return the size or -1 if error */
 105 int load_image_targphys(const char *filename,
 106                         hwaddr addr, uint64_t max_sz)
 107 {
 108     int size;
 109
 110     size = get_image_size(filename);
 111     if (size > max_sz) {
 112         return -1;
 113     }
 114     if (size > 0) {
 115         rom_add_file_fixed(filename, addr, -1);
 116     }
 117     return size;
 118 }
 119
 120 void pstrcpy_targphys(const char *name, hwaddr dest, int buf_size,
 121                       const char *source)
 122 {
 123     const char *nulp;
 124     char *ptr;
 125
 126     if (buf_size <= 0) return;
 127     nulp = memchr(source, 0, buf_size);
 128     if (nulp) {
 129         rom_add_blob_fixed(name, source, (nulp - source) + 1, dest);
 130     } else {
 131         rom_add_blob_fixed(name, source, buf_size, dest);
 132         ptr = rom_ptr(dest + buf_size - 1);
 133         *ptr = 0;
 134     }
 135 }
 136
 137 /* A.OUT loader */
 138
 139 struct exec
 140 {
 141   uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
 142   uint32_t a_text;   /* length of text, in bytes */
 143   uint32_t a_data;   /* length of data, in bytes */
 144   uint32_t a_bss;    /* length of uninitialized data area, in bytes */
 145   uint32_t a_syms;   /* length of symbol table data in file, in bytes */
 146   uint32_t a_entry;  /* start address */
 147   uint32_t a_trsize; /* length of relocation info for text, in bytes */
 148   uint32_t a_drsize; /* length of relocation info for data, in bytes */
 149 };
 150
 151 static void bswap_ahdr(struct exec *e)
 152 {
 153     bswap32s(&e->a_info);
 154     bswap32s(&e->a_text);
 155     bswap32s(&e->a_data);
 156     bswap32s(&e->a_bss);
 157     bswap32s(&e->a_syms);
 158     bswap32s(&e->a_entry);
 159     bswap32s(&e->a_trsize);
 160     bswap32s(&e->a_drsize);
 161 }
 162
 163 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
 164 #define OMAGIC 0407
 165 #define NMAGIC 0410
 166 #define ZMAGIC 0413
 167 #define QMAGIC 0314
 168 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
 169 #define N_TXTOFF(x)                                                     \
 170     (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :     \
 171      (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
 172 #define N_TXTADDR(x, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0)
 173 #define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1))
 174
 175 #define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text)
 176
 177 #define N_DATADDR(x, target_page_size) \
 178     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \
 179      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size)))
 180
 181
 182 int load_aout(const char *filename, hwaddr addr, int max_sz,
 183               int bswap_needed, hwaddr target_page_size)
 184 {
 185     int fd;
 186     ssize_t size, ret;
 187     struct exec e;
 188     uint32_t magic;
 189
 190     fd = open(filename, O_RDONLY | O_BINARY);
 191     if (fd < 0)
 192         return -1;
 193
 194     size = read(fd, &e, sizeof(e));
 195     if (size < 0)
 196         goto fail;
 197
 198     if (bswap_needed) {
 199         bswap_ahdr(&e);
 200     }
 201
 202     magic = N_MAGIC(e);
 203     switch (magic) {
 204     case ZMAGIC:
 205     case QMAGIC:
 206     case OMAGIC:
 207         if (e.a_text + e.a_data > max_sz)
 208             goto fail;
 209         lseek(fd, N_TXTOFF(e), SEEK_SET);
 210         size = read_targphys(filename, fd, addr, e.a_text + e.a_data);
 211         if (size < 0)
 212             goto fail;
 213         break;
 214     case NMAGIC:
 215         if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
 216             goto fail;
 217         lseek(fd, N_TXTOFF(e), SEEK_SET);
 218         size = read_targphys(filename, fd, addr, e.a_text);
 219         if (size < 0)
 220             goto fail;
 221         ret = read_targphys(filename, fd, addr + N_DATADDR(e, target_page_size),
 222                             e.a_data);
 223         if (ret < 0)
 224             goto fail;
 225         size += ret;
 226         break;
 227     default:
 228         goto fail;
 229     }
 230     close(fd);
 231     return size;
 232  fail:
 233     close(fd);
 234     return -1;
 235 }
 236
 237 /* ELF loader */
 238
 239 static void *load_at(int fd, int offset, int size)
 240 {
 241     void *ptr;
 242     if (lseek(fd, offset, SEEK_SET) < 0)
 243         return NULL;
 244     ptr = g_malloc(size);
 245     if (read(fd, ptr, size) != size) {
 246         g_free(ptr);
 247         return NULL;
 248     }
 249     return ptr;
 250 }
 251
 252 #ifdef ELF_CLASS
 253 #undef ELF_CLASS
 254 #endif
 255
 256 #define ELF_CLASS   ELFCLASS32
 257 #include "elf.h"
 258
 259 #define SZ              32
 260 #define elf_word        uint32_t
 261 #define elf_sword        int32_t
 262 #define bswapSZs        bswap32s
 263 #include "elf_ops.h"
 264
 265 #undef elfhdr
 266 #undef elf_phdr
 267 #undef elf_shdr
 268 #undef elf_sym
 269 #undef elf_note
 270 #undef elf_word
 271 #undef elf_sword
 272 #undef bswapSZs
 273 #undef SZ
 274 #define elfhdr          elf64_hdr
 275 #define elf_phdr        elf64_phdr
 276 #define elf_note        elf64_note
 277 #define elf_shdr        elf64_shdr
 278 #define elf_sym         elf64_sym
 279 #define elf_word        uint64_t
 280 #define elf_sword        int64_t
 281 #define bswapSZs        bswap64s
 282 #define SZ              64
 283 #include "elf_ops.h"
 284
 285 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 286 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
 287              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
 288              uint64_t *highaddr, int big_endian, int elf_machine, int clear_lsb)
 289 {
 290     int fd, data_order, target_data_order, must_swab, ret;
 291     uint8_t e_ident[EI_NIDENT];
 292
 293     fd = open(filename, O_RDONLY | O_BINARY);
 294     if (fd < 0) {
 295         perror(filename);
 296         return -1;
 297     }
 298     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 299         goto fail;
 300     if (e_ident[0] != ELFMAG0 ||
 301         e_ident[1] != ELFMAG1 ||
 302         e_ident[2] != ELFMAG2 ||
 303         e_ident[3] != ELFMAG3)
 304         goto fail;
 305 #ifdef HOST_WORDS_BIGENDIAN
 306     data_order = ELFDATA2MSB;
 307 #else
 308     data_order = ELFDATA2LSB;
 309 #endif
 310     must_swab = data_order != e_ident[EI_DATA];
 311     if (big_endian) {
 312         target_data_order = ELFDATA2MSB;
 313     } else {
 314         target_data_order = ELFDATA2LSB;
 315     }
 316
 317     if (target_data_order != e_ident[EI_DATA]) {
 318         goto fail;
 319     }
 320
 321     lseek(fd, 0, SEEK_SET);
 322     if (e_ident[EI_CLASS] == ELFCLASS64) {
 323         ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
 324                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 325     } else {
 326         ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
 327                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 328     }
 329
 330     close(fd);
 331     return ret;
 332
 333  fail:
 334     close(fd);
 335     return -1;
 336 }
 337
 338 static void bswap_uboot_header(uboot_image_header_t *hdr)
 339 {
 340 #ifndef HOST_WORDS_BIGENDIAN
 341     bswap32s(&hdr->ih_magic);
 342     bswap32s(&hdr->ih_hcrc);
 343     bswap32s(&hdr->ih_time);
 344     bswap32s(&hdr->ih_size);
 345     bswap32s(&hdr->ih_load);
 346     bswap32s(&hdr->ih_ep);
 347     bswap32s(&hdr->ih_dcrc);
 348 #endif
 349 }
 350
 351
 352 #define ZALLOC_ALIGNMENT        16
 353
 354 static void *zalloc(void *x, unsigned items, unsigned size)
 355 {
 356     void *p;
 357
 358     size *= items;
 359     size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
 360
 361     p = g_malloc(size);
 362
 363     return (p);
 364 }
 365
 366 static void zfree(void *x, void *addr)
 367 {
 368     g_free(addr);
 369 }
 370
 371
 372 #define HEAD_CRC        2
 373 #define EXTRA_FIELD     4
 374 #define ORIG_NAME       8
 375 #define COMMENT         0x10
 376 #define RESERVED        0xe0
 377
 378 #define DEFLATED        8
 379
 380 /* This is the usual maximum in uboot, so if a uImage overflows this, it would
 381  * overflow on real hardware too. */
 382 #define UBOOT_MAX_GUNZIP_BYTES (64 << 20)
 383
 384 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
 385                       size_t srclen)
 386 {
 387     z_stream s;
 388     ssize_t dstbytes;
 389     int r, i, flags;
 390
 391     /* skip header */
 392     i = 10;
 393     flags = src[3];
 394     if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 395         puts ("Error: Bad gzipped data\n");
 396         return -1;
 397     }
 398     if ((flags & EXTRA_FIELD) != 0)
 399         i = 12 + src[10] + (src[11] << 8);
 400     if ((flags & ORIG_NAME) != 0)
 401         while (src[i++] != 0)
 402             ;
 403     if ((flags & COMMENT) != 0)
 404         while (src[i++] != 0)
 405             ;
 406     if ((flags & HEAD_CRC) != 0)
 407         i += 2;
 408     if (i >= srclen) {
 409         puts ("Error: gunzip out of data in header\n");
 410         return -1;
 411     }
 412
 413     s.zalloc = zalloc;
 414     s.zfree = zfree;
 415
 416     r = inflateInit2(&s, -MAX_WBITS);
 417     if (r != Z_OK) {
 418         printf ("Error: inflateInit2() returned %d\n", r);
 419         return (-1);
 420     }
 421     s.next_in = src + i;
 422     s.avail_in = srclen - i;
 423     s.next_out = dst;
 424     s.avail_out = dstlen;
 425     r = inflate(&s, Z_FINISH);
 426     if (r != Z_OK && r != Z_STREAM_END) {
 427         printf ("Error: inflate() returned %d\n", r);
 428         return -1;
 429     }
 430     dstbytes = s.next_out - (unsigned char *) dst;
 431     inflateEnd(&s);
 432
 433     return dstbytes;
 434 }
 435
 436 /* Load a U-Boot image.  */
 437 int load_uimage(const char *filename, hwaddr *ep,
 438                 hwaddr *loadaddr, int *is_linux)
 439 {
 440     int fd;
 441     int size;
 442     uboot_image_header_t h;
 443     uboot_image_header_t *hdr = &h;
 444     uint8_t *data = NULL;
 445     int ret = -1;
 446
 447     fd = open(filename, O_RDONLY | O_BINARY);
 448     if (fd < 0)
 449         return -1;
 450
 451     size = read(fd, hdr, sizeof(uboot_image_header_t));
 452     if (size < 0)
 453         goto out;
 454
 455     bswap_uboot_header(hdr);
 456
 457     if (hdr->ih_magic != IH_MAGIC)
 458         goto out;
 459
 460     /* TODO: Implement other image types.  */
 461     if (hdr->ih_type != IH_TYPE_KERNEL) {
 462         fprintf(stderr, "Can only load u-boot image type \"kernel\"\n");
 463         goto out;
 464     }
 465
 466     switch (hdr->ih_comp) {
 467     case IH_COMP_NONE:
 468     case IH_COMP_GZIP:
 469         break;
 470     default:
 471         fprintf(stderr,
 472                 "Unable to load u-boot images with compression type %d\n",
 473                 hdr->ih_comp);
 474         goto out;
 475     }
 476
 477     /* TODO: Check CPU type.  */
 478     if (is_linux) {
 479         if (hdr->ih_os == IH_OS_LINUX)
 480             *is_linux = 1;
 481         else
 482             *is_linux = 0;
 483     }
 484
 485     *ep = hdr->ih_ep;
 486     data = g_malloc(hdr->ih_size);
 487
 488     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 489         fprintf(stderr, "Error reading file\n");
 490         goto out;
 491     }
 492
 493     if (hdr->ih_comp == IH_COMP_GZIP) {
 494         uint8_t *compressed_data;
 495         size_t max_bytes;
 496         ssize_t bytes;
 497
 498         compressed_data = data;
 499         max_bytes = UBOOT_MAX_GUNZIP_BYTES;
 500         data = g_malloc(max_bytes);
 501
 502         bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
 503         g_free(compressed_data);
 504         if (bytes < 0) {
 505             fprintf(stderr, "Unable to decompress gzipped image!\n");
 506             goto out;
 507         }
 508         hdr->ih_size = bytes;
 509     }
 510
 511     rom_add_blob_fixed(filename, data, hdr->ih_size, hdr->ih_load);
 512
 513     if (loadaddr)
 514         *loadaddr = hdr->ih_load;
 515
 516     ret = hdr->ih_size;
 517
 518 out:
 519     if (data)
 520         g_free(data);
 521     close(fd);
 522     return ret;
 523 }
 524
 525 /*
 526  * Functions for reboot-persistent memory regions.
 527  *  - used for vga bios and option roms.
 528  *  - also linux kernel (-kernel / -initrd).
 529  */
 530
 531 typedef struct Rom Rom;
 532
 533 struct Rom {
 534     char *name;
 535     char *path;
 536     size_t romsize;
 537     uint8_t *data;
 538     int isrom;
 539     char *fw_dir;
 540     char *fw_file;
 541
 542     hwaddr addr;
 543     QTAILQ_ENTRY(Rom) next;
 544 };
 545
 546 static FWCfgState *fw_cfg;
 547 static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
 548
 549 static void rom_insert(Rom *rom)
 550 {
 551     Rom *item;
 552
 553     if (roms_loaded) {
 554         hw_error ("ROM images must be loaded at startup\n");
 555     }
 556
 557     /* list is ordered by load address */
 558     QTAILQ_FOREACH(item, &roms, next) {
 559         if (rom->addr >= item->addr)
 560             continue;
 561         QTAILQ_INSERT_BEFORE(item, rom, next);
 562         return;
 563     }
 564     QTAILQ_INSERT_TAIL(&roms, rom, next);
 565 }
 566
 567 int rom_add_file(const char *file, const char *fw_dir,
 568                  hwaddr addr, int32_t bootindex)
 569 {
 570     Rom *rom;
 571     int rc, fd = -1;
 572     char devpath[100];
 573
 574     rom = g_malloc0(sizeof(*rom));
 575     rom->name = g_strdup(file);
 576     rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
 577     if (rom->path == NULL) {
 578         rom->path = g_strdup(file);
 579     }
 580
 581     fd = open(rom->path, O_RDONLY | O_BINARY);
 582     if (fd == -1) {
 583         fprintf(stderr, "Could not open option rom '%s': %s\n",
 584                 rom->path, strerror(errno));
 585         goto err;
 586     }
 587
 588     if (fw_dir) {
 589         rom->fw_dir  = g_strdup(fw_dir);
 590         rom->fw_file = g_strdup(file);
 591     }
 592     rom->addr    = addr;
 593     rom->romsize = lseek(fd, 0, SEEK_END);
 594     rom->data    = g_malloc0(rom->romsize);
 595     lseek(fd, 0, SEEK_SET);
 596     rc = read(fd, rom->data, rom->romsize);
 597     if (rc != rom->romsize) {
 598         fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
 599                 rom->name, rc, rom->romsize);
 600         goto err;
 601     }
 602     close(fd);
 603     rom_insert(rom);
 604     if (rom->fw_file && fw_cfg) {
 605         const char *basename;
 606         char fw_file_name[56];
 607
 608         basename = strrchr(rom->fw_file, '/');
 609         if (basename) {
 610             basename++;
 611         } else {
 612             basename = rom->fw_file;
 613         }
 614         snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
 615                  basename);
 616         fw_cfg_add_file(fw_cfg, fw_file_name, rom->data, rom->romsize);
 617         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
 618     } else {
 619         snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
 620     }
 621
 622     add_boot_device_path(bootindex, NULL, devpath);
 623     return 0;
 624
 625 err:
 626     if (fd != -1)
 627         close(fd);
 628     g_free(rom->data);
 629     g_free(rom->path);
 630     g_free(rom->name);
 631     g_free(rom);
 632     return -1;
 633 }
 634
 635 int rom_add_blob(const char *name, const void *blob, size_t len,
 636                  hwaddr addr)
 637 {
 638     Rom *rom;
 639
 640     rom = g_malloc0(sizeof(*rom));
 641     rom->name    = g_strdup(name);
 642     rom->addr    = addr;
 643     rom->romsize = len;
 644     rom->data    = g_malloc0(rom->romsize);
 645     memcpy(rom->data, blob, len);
 646     rom_insert(rom);
 647     return 0;
 648 }
 649
 650 int rom_add_vga(const char *file)
 651 {
 652     return rom_add_file(file, "vgaroms", 0, -1);
 653 }
 654
 655 int rom_add_option(const char *file, int32_t bootindex)
 656 {
 657     return rom_add_file(file, "genroms", 0, bootindex);
 658 }
 659
 660 static void rom_reset(void *unused)
 661 {
 662     Rom *rom;
 663
 664     QTAILQ_FOREACH(rom, &roms, next) {
 665         if (rom->fw_file) {
 666             continue;
 667         }
 668         if (rom->data == NULL) {
 669             continue;
 670         }
 671         cpu_physical_memory_write_rom(rom->addr, rom->data, rom->romsize);
 672         if (rom->isrom) {
 673             /* rom needs to be written only once */
 674             g_free(rom->data);
 675             rom->data = NULL;
 676         }
 677     }
 678 }
 679
 680 int rom_load_all(void)
 681 {
 682     hwaddr addr = 0;
 683     MemoryRegionSection section;
 684     Rom *rom;
 685
 686     QTAILQ_FOREACH(rom, &roms, next) {
 687         if (rom->fw_file) {
 688             continue;
 689         }
 690         if (addr > rom->addr) {
 691             fprintf(stderr, "rom: requested regions overlap "
 692                     "(rom %s. free=0x" TARGET_FMT_plx
 693                     ", addr=0x" TARGET_FMT_plx ")\n",
 694                     rom->name, addr, rom->addr);
 695             return -1;
 696         }
 697         addr  = rom->addr;
 698         addr += rom->romsize;
 699         section = memory_region_find(get_system_memory(), rom->addr, 1);
 700         rom->isrom = section.size && memory_region_is_rom(section.mr);
 701     }
 702     qemu_register_reset(rom_reset, NULL);
 703     roms_loaded = 1;
 704     return 0;
 705 }
 706
 707 void rom_set_fw(void *f)
 708 {
 709     fw_cfg = f;
 710 }
 711
 712 static Rom *find_rom(hwaddr addr)
 713 {
 714     Rom *rom;
 715
 716     QTAILQ_FOREACH(rom, &roms, next) {
 717         if (rom->fw_file) {
 718             continue;
 719         }
 720         if (rom->addr > addr) {
 721             continue;
 722         }
 723         if (rom->addr + rom->romsize < addr) {
 724             continue;
 725         }
 726         return rom;
 727     }
 728     return NULL;
 729 }
 730
 731 /*
 732  * Copies memory from registered ROMs to dest. Any memory that is contained in
 733  * a ROM between addr and addr + size is copied. Note that this can involve
 734  * multiple ROMs, which need not start at addr and need not end at addr + size.
 735  */
 736 int rom_copy(uint8_t *dest, hwaddr addr, size_t size)
 737 {
 738     hwaddr end = addr + size;
 739     uint8_t *s, *d = dest;
 740     size_t l = 0;
 741     Rom *rom;
 742
 743     QTAILQ_FOREACH(rom, &roms, next) {
 744         if (rom->fw_file) {
 745             continue;
 746         }
 747         if (rom->addr + rom->romsize < addr) {
 748             continue;
 749         }
 750         if (rom->addr > end) {
 751             break;
 752         }
 753         if (!rom->data) {
 754             continue;
 755         }
 756
 757         d = dest + (rom->addr - addr);
 758         s = rom->data;
 759         l = rom->romsize;
 760
 761         if ((d + l) > (dest + size)) {
 762             l = dest - d;
 763         }
 764
 765         memcpy(d, s, l);
 766     }
 767
 768     return (d + l) - dest;
 769 }
 770
 771 void *rom_ptr(hwaddr addr)
 772 {
 773     Rom *rom;
 774
 775     rom = find_rom(addr);
 776     if (!rom || !rom->data)
 777         return NULL;
 778     return rom->data + (addr - rom->addr);
 779 }
 780
 781 void do_info_roms(Monitor *mon, const QDict *qdict)
 782 {
 783     Rom *rom;
 784
 785     QTAILQ_FOREACH(rom, &roms, next) {
 786         if (!rom->fw_file) {
 787             monitor_printf(mon, "addr=" TARGET_FMT_plx
 788                            " size=0x%06zx mem=%s name=\"%s\"\n",
 789                            rom->addr, rom->romsize,
 790                            rom->isrom ? "rom" : "ram",
 791                            rom->name);
 792         } else {
 793             monitor_printf(mon, "fw=%s/%s"
 794                            " size=0x%06zx name=\"%s\"\n",
 795                            rom->fw_dir,
 796                            rom->fw_file,
 797                            rom->romsize,
 798                            rom->name);
 799         }
 800     }
 801 }