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 #include "memory.h"
  53 #include "exec-memory.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, target_phys_addr_t 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                         target_phys_addr_t addr, int max_sz)
 107 {
 108     int size;
 109
 110     size = get_image_size(filename);
 111     if (size > 0)
 112         rom_add_file_fixed(filename, addr, -1);
 113     return size;
 114 }
 115
 116 void pstrcpy_targphys(const char *name, target_phys_addr_t dest, int buf_size,
 117                       const char *source)
 118 {
 119     const char *nulp;
 120     char *ptr;
 121
 122     if (buf_size <= 0) return;
 123     nulp = memchr(source, 0, buf_size);
 124     if (nulp) {
 125         rom_add_blob_fixed(name, source, (nulp - source) + 1, dest);
 126     } else {
 127         rom_add_blob_fixed(name, source, buf_size, dest);
 128         ptr = rom_ptr(dest + buf_size - 1);
 129         *ptr = 0;
 130     }
 131 }
 132
 133 /* A.OUT loader */
 134
 135 struct exec
 136 {
 137   uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
 138   uint32_t a_text;   /* length of text, in bytes */
 139   uint32_t a_data;   /* length of data, in bytes */
 140   uint32_t a_bss;    /* length of uninitialized data area, in bytes */
 141   uint32_t a_syms;   /* length of symbol table data in file, in bytes */
 142   uint32_t a_entry;  /* start address */
 143   uint32_t a_trsize; /* length of relocation info for text, in bytes */
 144   uint32_t a_drsize; /* length of relocation info for data, in bytes */
 145 };
 146
 147 static void bswap_ahdr(struct exec *e)
 148 {
 149     bswap32s(&e->a_info);
 150     bswap32s(&e->a_text);
 151     bswap32s(&e->a_data);
 152     bswap32s(&e->a_bss);
 153     bswap32s(&e->a_syms);
 154     bswap32s(&e->a_entry);
 155     bswap32s(&e->a_trsize);
 156     bswap32s(&e->a_drsize);
 157 }
 158
 159 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
 160 #define OMAGIC 0407
 161 #define NMAGIC 0410
 162 #define ZMAGIC 0413
 163 #define QMAGIC 0314
 164 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
 165 #define N_TXTOFF(x)                                                     \
 166     (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :     \
 167      (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
 168 #define N_TXTADDR(x, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0)
 169 #define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1))
 170
 171 #define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text)
 172
 173 #define N_DATADDR(x, target_page_size) \
 174     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \
 175      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size)))
 176
 177
 178 int load_aout(const char *filename, target_phys_addr_t addr, int max_sz,
 179               int bswap_needed, target_phys_addr_t target_page_size)
 180 {
 181     int fd;
 182     ssize_t size, ret;
 183     struct exec e;
 184     uint32_t magic;
 185
 186     fd = open(filename, O_RDONLY | O_BINARY);
 187     if (fd < 0)
 188         return -1;
 189
 190     size = read(fd, &e, sizeof(e));
 191     if (size < 0)
 192         goto fail;
 193
 194     if (bswap_needed) {
 195         bswap_ahdr(&e);
 196     }
 197
 198     magic = N_MAGIC(e);
 199     switch (magic) {
 200     case ZMAGIC:
 201     case QMAGIC:
 202     case OMAGIC:
 203         if (e.a_text + e.a_data > max_sz)
 204             goto fail;
 205         lseek(fd, N_TXTOFF(e), SEEK_SET);
 206         size = read_targphys(filename, fd, addr, e.a_text + e.a_data);
 207         if (size < 0)
 208             goto fail;
 209         break;
 210     case NMAGIC:
 211         if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
 212             goto fail;
 213         lseek(fd, N_TXTOFF(e), SEEK_SET);
 214         size = read_targphys(filename, fd, addr, e.a_text);
 215         if (size < 0)
 216             goto fail;
 217         ret = read_targphys(filename, fd, addr + N_DATADDR(e, target_page_size),
 218                             e.a_data);
 219         if (ret < 0)
 220             goto fail;
 221         size += ret;
 222         break;
 223     default:
 224         goto fail;
 225     }
 226     close(fd);
 227     return size;
 228  fail:
 229     close(fd);
 230     return -1;
 231 }
 232
 233 /* ELF loader */
 234
 235 static void *load_at(int fd, int offset, int size)
 236 {
 237     void *ptr;
 238     if (lseek(fd, offset, SEEK_SET) < 0)
 239         return NULL;
 240     ptr = g_malloc(size);
 241     if (read(fd, ptr, size) != size) {
 242         g_free(ptr);
 243         return NULL;
 244     }
 245     return ptr;
 246 }
 247
 248 #ifdef ELF_CLASS
 249 #undef ELF_CLASS
 250 #endif
 251
 252 #define ELF_CLASS   ELFCLASS32
 253 #include "elf.h"
 254
 255 #define SZ              32
 256 #define elf_word        uint32_t
 257 #define elf_sword        int32_t
 258 #define bswapSZs        bswap32s
 259 #include "elf_ops.h"
 260
 261 #undef elfhdr
 262 #undef elf_phdr
 263 #undef elf_shdr
 264 #undef elf_sym
 265 #undef elf_note
 266 #undef elf_word
 267 #undef elf_sword
 268 #undef bswapSZs
 269 #undef SZ
 270 #define elfhdr          elf64_hdr
 271 #define elf_phdr        elf64_phdr
 272 #define elf_note        elf64_note
 273 #define elf_shdr        elf64_shdr
 274 #define elf_sym         elf64_sym
 275 #define elf_word        uint64_t
 276 #define elf_sword        int64_t
 277 #define bswapSZs        bswap64s
 278 #define SZ              64
 279 #include "elf_ops.h"
 280
 281 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 282 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
 283              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
 284              uint64_t *highaddr, int big_endian, int elf_machine, int clear_lsb)
 285 {
 286     int fd, data_order, target_data_order, must_swab, ret;
 287     uint8_t e_ident[EI_NIDENT];
 288
 289     fd = open(filename, O_RDONLY | O_BINARY);
 290     if (fd < 0) {
 291         perror(filename);
 292         return -1;
 293     }
 294     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 295         goto fail;
 296     if (e_ident[0] != ELFMAG0 ||
 297         e_ident[1] != ELFMAG1 ||
 298         e_ident[2] != ELFMAG2 ||
 299         e_ident[3] != ELFMAG3)
 300         goto fail;
 301 #ifdef HOST_WORDS_BIGENDIAN
 302     data_order = ELFDATA2MSB;
 303 #else
 304     data_order = ELFDATA2LSB;
 305 #endif
 306     must_swab = data_order != e_ident[EI_DATA];
 307     if (big_endian) {
 308         target_data_order = ELFDATA2MSB;
 309     } else {
 310         target_data_order = ELFDATA2LSB;
 311     }
 312
 313     if (target_data_order != e_ident[EI_DATA]) {
 314         goto fail;
 315     }
 316
 317     lseek(fd, 0, SEEK_SET);
 318     if (e_ident[EI_CLASS] == ELFCLASS64) {
 319         ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
 320                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 321     } else {
 322         ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
 323                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 324     }
 325
 326     close(fd);
 327     return ret;
 328
 329  fail:
 330     close(fd);
 331     return -1;
 332 }
 333
 334 static void bswap_uboot_header(uboot_image_header_t *hdr)
 335 {
 336 #ifndef HOST_WORDS_BIGENDIAN
 337     bswap32s(&hdr->ih_magic);
 338     bswap32s(&hdr->ih_hcrc);
 339     bswap32s(&hdr->ih_time);
 340     bswap32s(&hdr->ih_size);
 341     bswap32s(&hdr->ih_load);
 342     bswap32s(&hdr->ih_ep);
 343     bswap32s(&hdr->ih_dcrc);
 344 #endif
 345 }
 346
 347
 348 #define ZALLOC_ALIGNMENT        16
 349
 350 static void *zalloc(void *x, unsigned items, unsigned size)
 351 {
 352     void *p;
 353
 354     size *= items;
 355     size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
 356
 357     p = g_malloc(size);
 358
 359     return (p);
 360 }
 361
 362 static void zfree(void *x, void *addr)
 363 {
 364     g_free(addr);
 365 }
 366
 367
 368 #define HEAD_CRC        2
 369 #define EXTRA_FIELD     4
 370 #define ORIG_NAME       8
 371 #define COMMENT         0x10
 372 #define RESERVED        0xe0
 373
 374 #define DEFLATED        8
 375
 376 /* This is the maximum in uboot, so if a uImage overflows this, it would
 377  * overflow on real hardware too. */
 378 #define UBOOT_MAX_GUNZIP_BYTES 0x800000
 379
 380 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
 381                       size_t srclen)
 382 {
 383     z_stream s;
 384     ssize_t dstbytes;
 385     int r, i, flags;
 386
 387     /* skip header */
 388     i = 10;
 389     flags = src[3];
 390     if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 391         puts ("Error: Bad gzipped data\n");
 392         return -1;
 393     }
 394     if ((flags & EXTRA_FIELD) != 0)
 395         i = 12 + src[10] + (src[11] << 8);
 396     if ((flags & ORIG_NAME) != 0)
 397         while (src[i++] != 0)
 398             ;
 399     if ((flags & COMMENT) != 0)
 400         while (src[i++] != 0)
 401             ;
 402     if ((flags & HEAD_CRC) != 0)
 403         i += 2;
 404     if (i >= srclen) {
 405         puts ("Error: gunzip out of data in header\n");
 406         return -1;
 407     }
 408
 409     s.zalloc = zalloc;
 410     s.zfree = zfree;
 411
 412     r = inflateInit2(&s, -MAX_WBITS);
 413     if (r != Z_OK) {
 414         printf ("Error: inflateInit2() returned %d\n", r);
 415         return (-1);
 416     }
 417     s.next_in = src + i;
 418     s.avail_in = srclen - i;
 419     s.next_out = dst;
 420     s.avail_out = dstlen;
 421     r = inflate(&s, Z_FINISH);
 422     if (r != Z_OK && r != Z_STREAM_END) {
 423         printf ("Error: inflate() returned %d\n", r);
 424         return -1;
 425     }
 426     dstbytes = s.next_out - (unsigned char *) dst;
 427     inflateEnd(&s);
 428
 429     return dstbytes;
 430 }
 431
 432 /* Load a U-Boot image.  */
 433 int load_uimage(const char *filename, target_phys_addr_t *ep,
 434                 target_phys_addr_t *loadaddr, int *is_linux)
 435 {
 436     int fd;
 437     int size;
 438     uboot_image_header_t h;
 439     uboot_image_header_t *hdr = &h;
 440     uint8_t *data = NULL;
 441     int ret = -1;
 442
 443     fd = open(filename, O_RDONLY | O_BINARY);
 444     if (fd < 0)
 445         return -1;
 446
 447     size = read(fd, hdr, sizeof(uboot_image_header_t));
 448     if (size < 0)
 449         goto out;
 450
 451     bswap_uboot_header(hdr);
 452
 453     if (hdr->ih_magic != IH_MAGIC)
 454         goto out;
 455
 456     /* TODO: Implement other image types.  */
 457     if (hdr->ih_type != IH_TYPE_KERNEL) {
 458         fprintf(stderr, "Can only load u-boot image type \"kernel\"\n");
 459         goto out;
 460     }
 461
 462     switch (hdr->ih_comp) {
 463     case IH_COMP_NONE:
 464     case IH_COMP_GZIP:
 465         break;
 466     default:
 467         fprintf(stderr,
 468                 "Unable to load u-boot images with compression type %d\n",
 469                 hdr->ih_comp);
 470         goto out;
 471     }
 472
 473     /* TODO: Check CPU type.  */
 474     if (is_linux) {
 475         if (hdr->ih_os == IH_OS_LINUX)
 476             *is_linux = 1;
 477         else
 478             *is_linux = 0;
 479     }
 480
 481     *ep = hdr->ih_ep;
 482     data = g_malloc(hdr->ih_size);
 483
 484     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 485         fprintf(stderr, "Error reading file\n");
 486         goto out;
 487     }
 488
 489     if (hdr->ih_comp == IH_COMP_GZIP) {
 490         uint8_t *compressed_data;
 491         size_t max_bytes;
 492         ssize_t bytes;
 493
 494         compressed_data = data;
 495         max_bytes = UBOOT_MAX_GUNZIP_BYTES;
 496         data = g_malloc(max_bytes);
 497
 498         bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
 499         g_free(compressed_data);
 500         if (bytes < 0) {
 501             fprintf(stderr, "Unable to decompress gzipped image!\n");
 502             goto out;
 503         }
 504         hdr->ih_size = bytes;
 505     }
 506
 507     rom_add_blob_fixed(filename, data, hdr->ih_size, hdr->ih_load);
 508
 509     if (loadaddr)
 510         *loadaddr = hdr->ih_load;
 511
 512     ret = hdr->ih_size;
 513
 514 out:
 515     if (data)
 516         g_free(data);
 517     close(fd);
 518     return ret;
 519 }
 520
 521 /*
 522  * Functions for reboot-persistent memory regions.
 523  *  - used for vga bios and option roms.
 524  *  - also linux kernel (-kernel / -initrd).
 525  */
 526
 527 typedef struct Rom Rom;
 528
 529 struct Rom {
 530     char *name;
 531     char *path;
 532     size_t romsize;
 533     uint8_t *data;
 534     int isrom;
 535     char *fw_dir;
 536     char *fw_file;
 537
 538     target_phys_addr_t addr;
 539     QTAILQ_ENTRY(Rom) next;
 540 };
 541
 542 static FWCfgState *fw_cfg;
 543 static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
 544
 545 static void rom_insert(Rom *rom)
 546 {
 547     Rom *item;
 548
 549     if (roms_loaded) {
 550         hw_error ("ROM images must be loaded at startup\n");
 551     }
 552
 553     /* list is ordered by load address */
 554     QTAILQ_FOREACH(item, &roms, next) {
 555         if (rom->addr >= item->addr)
 556             continue;
 557         QTAILQ_INSERT_BEFORE(item, rom, next);
 558         return;
 559     }
 560     QTAILQ_INSERT_TAIL(&roms, rom, next);
 561 }
 562
 563 int rom_add_file(const char *file, const char *fw_dir,
 564                  target_phys_addr_t addr, int32_t bootindex)
 565 {
 566     Rom *rom;
 567     int rc, fd = -1;
 568     char devpath[100];
 569
 570     rom = g_malloc0(sizeof(*rom));
 571     rom->name = g_strdup(file);
 572     rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
 573     if (rom->path == NULL) {
 574         rom->path = g_strdup(file);
 575     }
 576
 577     fd = open(rom->path, O_RDONLY | O_BINARY);
 578     if (fd == -1) {
 579         fprintf(stderr, "Could not open option rom '%s': %s\n",
 580                 rom->path, strerror(errno));
 581         goto err;
 582     }
 583
 584     if (fw_dir) {
 585         rom->fw_dir  = g_strdup(fw_dir);
 586         rom->fw_file = g_strdup(file);
 587     }
 588     rom->addr    = addr;
 589     rom->romsize = lseek(fd, 0, SEEK_END);
 590     rom->data    = g_malloc0(rom->romsize);
 591     lseek(fd, 0, SEEK_SET);
 592     rc = read(fd, rom->data, rom->romsize);
 593     if (rc != rom->romsize) {
 594         fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
 595                 rom->name, rc, rom->romsize);
 596         goto err;
 597     }
 598     close(fd);
 599     rom_insert(rom);
 600     if (rom->fw_file && fw_cfg) {
 601         const char *basename;
 602         char fw_file_name[56];
 603
 604         basename = strrchr(rom->fw_file, '/');
 605         if (basename) {
 606             basename++;
 607         } else {
 608             basename = rom->fw_file;
 609         }
 610         snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
 611                  basename);
 612         fw_cfg_add_file(fw_cfg, fw_file_name, rom->data, rom->romsize);
 613         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
 614     } else {
 615         snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
 616     }
 617
 618     add_boot_device_path(bootindex, NULL, devpath);
 619     return 0;
 620
 621 err:
 622     if (fd != -1)
 623         close(fd);
 624     g_free(rom->data);
 625     g_free(rom->path);
 626     g_free(rom->name);
 627     g_free(rom);
 628     return -1;
 629 }
 630
 631 int rom_add_blob(const char *name, const void *blob, size_t len,
 632                  target_phys_addr_t addr)
 633 {
 634     Rom *rom;
 635
 636     rom = g_malloc0(sizeof(*rom));
 637     rom->name    = g_strdup(name);
 638     rom->addr    = addr;
 639     rom->romsize = len;
 640     rom->data    = g_malloc0(rom->romsize);
 641     memcpy(rom->data, blob, len);
 642     rom_insert(rom);
 643     return 0;
 644 }
 645
 646 int rom_add_vga(const char *file)
 647 {
 648     return rom_add_file(file, "vgaroms", 0, -1);
 649 }
 650
 651 int rom_add_option(const char *file, int32_t bootindex)
 652 {
 653     return rom_add_file(file, "genroms", 0, bootindex);
 654 }
 655
 656 static void rom_reset(void *unused)
 657 {
 658     Rom *rom;
 659
 660     QTAILQ_FOREACH(rom, &roms, next) {
 661         if (rom->fw_file) {
 662             continue;
 663         }
 664         if (rom->data == NULL) {
 665             continue;
 666         }
 667         cpu_physical_memory_write_rom(rom->addr, rom->data, rom->romsize);
 668         if (rom->isrom) {
 669             /* rom needs to be written only once */
 670             g_free(rom->data);
 671             rom->data = NULL;
 672         }
 673     }
 674 }
 675
 676 int rom_load_all(void)
 677 {
 678     target_phys_addr_t addr = 0;
 679     MemoryRegionSection section;
 680     Rom *rom;
 681
 682     QTAILQ_FOREACH(rom, &roms, next) {
 683         if (rom->fw_file) {
 684             continue;
 685         }
 686         if (addr > rom->addr) {
 687             fprintf(stderr, "rom: requested regions overlap "
 688                     "(rom %s. free=0x" TARGET_FMT_plx
 689                     ", addr=0x" TARGET_FMT_plx ")\n",
 690                     rom->name, addr, rom->addr);
 691             return -1;
 692         }
 693         addr  = rom->addr;
 694         addr += rom->romsize;
 695         section = memory_region_find(get_system_memory(), rom->addr, 1);
 696         rom->isrom = section.size && memory_region_is_rom(section.mr);
 697     }
 698     qemu_register_reset(rom_reset, NULL);
 699     roms_loaded = 1;
 700     return 0;
 701 }
 702
 703 void rom_set_fw(void *f)
 704 {
 705     fw_cfg = f;
 706 }
 707
 708 static Rom *find_rom(target_phys_addr_t addr)
 709 {
 710     Rom *rom;
 711
 712     QTAILQ_FOREACH(rom, &roms, next) {
 713         if (rom->fw_file) {
 714             continue;
 715         }
 716         if (rom->addr > addr) {
 717             continue;
 718         }
 719         if (rom->addr + rom->romsize < addr) {
 720             continue;
 721         }
 722         return rom;
 723     }
 724     return NULL;
 725 }
 726
 727 /*
 728  * Copies memory from registered ROMs to dest. Any memory that is contained in
 729  * a ROM between addr and addr + size is copied. Note that this can involve
 730  * multiple ROMs, which need not start at addr and need not end at addr + size.
 731  */
 732 int rom_copy(uint8_t *dest, target_phys_addr_t addr, size_t size)
 733 {
 734     target_phys_addr_t end = addr + size;
 735     uint8_t *s, *d = dest;
 736     size_t l = 0;
 737     Rom *rom;
 738
 739     QTAILQ_FOREACH(rom, &roms, next) {
 740         if (rom->fw_file) {
 741             continue;
 742         }
 743         if (rom->addr + rom->romsize < addr) {
 744             continue;
 745         }
 746         if (rom->addr > end) {
 747             break;
 748         }
 749         if (!rom->data) {
 750             continue;
 751         }
 752
 753         d = dest + (rom->addr - addr);
 754         s = rom->data;
 755         l = rom->romsize;
 756
 757         if ((d + l) > (dest + size)) {
 758             l = dest - d;
 759         }
 760
 761         memcpy(d, s, l);
 762     }
 763
 764     return (d + l) - dest;
 765 }
 766
 767 void *rom_ptr(target_phys_addr_t addr)
 768 {
 769     Rom *rom;
 770
 771     rom = find_rom(addr);
 772     if (!rom || !rom->data)
 773         return NULL;
 774     return rom->data + (addr - rom->addr);
 775 }
 776
 777 void do_info_roms(Monitor *mon)
 778 {
 779     Rom *rom;
 780
 781     QTAILQ_FOREACH(rom, &roms, next) {
 782         if (!rom->fw_file) {
 783             monitor_printf(mon, "addr=" TARGET_FMT_plx
 784                            " size=0x%06zx mem=%s name=\"%s\"\n",
 785                            rom->addr, rom->romsize,
 786                            rom->isrom ? "rom" : "ram",
 787                            rom->name);
 788         } else {
 789             monitor_printf(mon, "fw=%s/%s"
 790                            " size=0x%06zx name=\"%s\"\n",
 791                            rom->fw_dir,
 792                            rom->fw_file,
 793                            rom->romsize,
 794                            rom->name);
 795         }
 796     }
 797 }