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