hw/core/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/hw.h"
  46 #include "disas/disas.h"
  47 #include "monitor/monitor.h"
  48 #include "sysemu/sysemu.h"
  49 #include "uboot_image.h"
  50 #include "hw/loader.h"
  51 #include "hw/nvram/fw_cfg.h"
  52 #include "exec/memory.h"
  53 #include "exec/address-spaces.h"
  54
  55 #include <zlib.h>
  56
  57 bool option_rom_has_mr = false;
  58 bool rom_file_has_mr = true;
  59
  60 static int roms_loaded;
  61
  62 /* return the size or -1 if error */
  63 int get_image_size(const char *filename)
  64 {
  65     int fd, size;
  66     fd = open(filename, O_RDONLY | O_BINARY);
  67     if (fd < 0)
  68         return -1;
  69     size = lseek(fd, 0, SEEK_END);
  70     close(fd);
  71     return size;
  72 }
  73
  74 /* return the size or -1 if error */
  75 /* deprecated, because caller does not specify buffer size! */
  76 int load_image(const char *filename, uint8_t *addr)
  77 {
  78     int fd, size;
  79     fd = open(filename, O_RDONLY | O_BINARY);
  80     if (fd < 0)
  81         return -1;
  82     size = lseek(fd, 0, SEEK_END);
  83     lseek(fd, 0, SEEK_SET);
  84     if (read(fd, addr, size) != size) {
  85         close(fd);
  86         return -1;
  87     }
  88     close(fd);
  89     return size;
  90 }
  91
  92 /* return the size or -1 if error */
  93 ssize_t load_image_size(const char *filename, void *addr, size_t size)
  94 {
  95     int fd;
  96     ssize_t actsize;
  97
  98     fd = open(filename, O_RDONLY | O_BINARY);
  99     if (fd < 0) {
 100         return -1;
 101     }
 102
 103     actsize = read(fd, addr, size);
 104     if (actsize < 0) {
 105         close(fd);
 106         return -1;
 107     }
 108     close(fd);
 109
 110     return actsize;
 111 }
 112
 113 /* read()-like version */
 114 ssize_t read_targphys(const char *name,
 115                       int fd, hwaddr dst_addr, size_t nbytes)
 116 {
 117     uint8_t *buf;
 118     ssize_t did;
 119
 120     buf = g_malloc(nbytes);
 121     did = read(fd, buf, nbytes);
 122     if (did > 0)
 123         rom_add_blob_fixed("read", buf, did, dst_addr);
 124     g_free(buf);
 125     return did;
 126 }
 127
 128 /* return the size or -1 if error */
 129 int load_image_targphys(const char *filename,
 130                         hwaddr addr, uint64_t max_sz)
 131 {
 132     int size;
 133
 134     size = get_image_size(filename);
 135     if (size > max_sz) {
 136         return -1;
 137     }
 138     if (size > 0) {
 139         rom_add_file_fixed(filename, addr, -1);
 140     }
 141     return size;
 142 }
 143
 144 void pstrcpy_targphys(const char *name, hwaddr dest, int buf_size,
 145                       const char *source)
 146 {
 147     const char *nulp;
 148     char *ptr;
 149
 150     if (buf_size <= 0) return;
 151     nulp = memchr(source, 0, buf_size);
 152     if (nulp) {
 153         rom_add_blob_fixed(name, source, (nulp - source) + 1, dest);
 154     } else {
 155         rom_add_blob_fixed(name, source, buf_size, dest);
 156         ptr = rom_ptr(dest + buf_size - 1);
 157         *ptr = 0;
 158     }
 159 }
 160
 161 /* A.OUT loader */
 162
 163 struct exec
 164 {
 165   uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
 166   uint32_t a_text;   /* length of text, in bytes */
 167   uint32_t a_data;   /* length of data, in bytes */
 168   uint32_t a_bss;    /* length of uninitialized data area, in bytes */
 169   uint32_t a_syms;   /* length of symbol table data in file, in bytes */
 170   uint32_t a_entry;  /* start address */
 171   uint32_t a_trsize; /* length of relocation info for text, in bytes */
 172   uint32_t a_drsize; /* length of relocation info for data, in bytes */
 173 };
 174
 175 static void bswap_ahdr(struct exec *e)
 176 {
 177     bswap32s(&e->a_info);
 178     bswap32s(&e->a_text);
 179     bswap32s(&e->a_data);
 180     bswap32s(&e->a_bss);
 181     bswap32s(&e->a_syms);
 182     bswap32s(&e->a_entry);
 183     bswap32s(&e->a_trsize);
 184     bswap32s(&e->a_drsize);
 185 }
 186
 187 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
 188 #define OMAGIC 0407
 189 #define NMAGIC 0410
 190 #define ZMAGIC 0413
 191 #define QMAGIC 0314
 192 #define _N_HDROFF(x) (1024 - sizeof (struct exec))
 193 #define N_TXTOFF(x)                                                     \
 194     (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :     \
 195      (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
 196 #define N_TXTADDR(x, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0)
 197 #define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1))
 198
 199 #define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text)
 200
 201 #define N_DATADDR(x, target_page_size) \
 202     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \
 203      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size)))
 204
 205
 206 int load_aout(const char *filename, hwaddr addr, int max_sz,
 207               int bswap_needed, hwaddr target_page_size)
 208 {
 209     int fd;
 210     ssize_t size, ret;
 211     struct exec e;
 212     uint32_t magic;
 213
 214     fd = open(filename, O_RDONLY | O_BINARY);
 215     if (fd < 0)
 216         return -1;
 217
 218     size = read(fd, &e, sizeof(e));
 219     if (size < 0)
 220         goto fail;
 221
 222     if (bswap_needed) {
 223         bswap_ahdr(&e);
 224     }
 225
 226     magic = N_MAGIC(e);
 227     switch (magic) {
 228     case ZMAGIC:
 229     case QMAGIC:
 230     case OMAGIC:
 231         if (e.a_text + e.a_data > max_sz)
 232             goto fail;
 233         lseek(fd, N_TXTOFF(e), SEEK_SET);
 234         size = read_targphys(filename, fd, addr, e.a_text + e.a_data);
 235         if (size < 0)
 236             goto fail;
 237         break;
 238     case NMAGIC:
 239         if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
 240             goto fail;
 241         lseek(fd, N_TXTOFF(e), SEEK_SET);
 242         size = read_targphys(filename, fd, addr, e.a_text);
 243         if (size < 0)
 244             goto fail;
 245         ret = read_targphys(filename, fd, addr + N_DATADDR(e, target_page_size),
 246                             e.a_data);
 247         if (ret < 0)
 248             goto fail;
 249         size += ret;
 250         break;
 251     default:
 252         goto fail;
 253     }
 254     close(fd);
 255     return size;
 256  fail:
 257     close(fd);
 258     return -1;
 259 }
 260
 261 /* ELF loader */
 262
 263 static void *load_at(int fd, int offset, int size)
 264 {
 265     void *ptr;
 266     if (lseek(fd, offset, SEEK_SET) < 0)
 267         return NULL;
 268     ptr = g_malloc(size);
 269     if (read(fd, ptr, size) != size) {
 270         g_free(ptr);
 271         return NULL;
 272     }
 273     return ptr;
 274 }
 275
 276 #ifdef ELF_CLASS
 277 #undef ELF_CLASS
 278 #endif
 279
 280 #define ELF_CLASS   ELFCLASS32
 281 #include "elf.h"
 282
 283 #define SZ              32
 284 #define elf_word        uint32_t
 285 #define elf_sword        int32_t
 286 #define bswapSZs        bswap32s
 287 #include "hw/elf_ops.h"
 288
 289 #undef elfhdr
 290 #undef elf_phdr
 291 #undef elf_shdr
 292 #undef elf_sym
 293 #undef elf_note
 294 #undef elf_word
 295 #undef elf_sword
 296 #undef bswapSZs
 297 #undef SZ
 298 #define elfhdr          elf64_hdr
 299 #define elf_phdr        elf64_phdr
 300 #define elf_note        elf64_note
 301 #define elf_shdr        elf64_shdr
 302 #define elf_sym         elf64_sym
 303 #define elf_word        uint64_t
 304 #define elf_sword        int64_t
 305 #define bswapSZs        bswap64s
 306 #define SZ              64
 307 #include "hw/elf_ops.h"
 308
 309 const char *load_elf_strerror(int error)
 310 {
 311     switch (error) {
 312     case 0:
 313         return "No error";
 314     case ELF_LOAD_FAILED:
 315         return "Failed to load ELF";
 316     case ELF_LOAD_NOT_ELF:
 317         return "The image is not ELF";
 318     case ELF_LOAD_WRONG_ARCH:
 319         return "The image is from incompatible architecture";
 320     case ELF_LOAD_WRONG_ENDIAN:
 321         return "The image has incorrect endianness";
 322     default:
 323         return "Unknown error";
 324     }
 325 }
 326
 327 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 328 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
 329              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
 330              uint64_t *highaddr, int big_endian, int elf_machine, int clear_lsb)
 331 {
 332     int fd, data_order, target_data_order, must_swab, ret = ELF_LOAD_FAILED;
 333     uint8_t e_ident[EI_NIDENT];
 334
 335     fd = open(filename, O_RDONLY | O_BINARY);
 336     if (fd < 0) {
 337         perror(filename);
 338         return -1;
 339     }
 340     if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
 341         goto fail;
 342     if (e_ident[0] != ELFMAG0 ||
 343         e_ident[1] != ELFMAG1 ||
 344         e_ident[2] != ELFMAG2 ||
 345         e_ident[3] != ELFMAG3) {
 346         ret = ELF_LOAD_NOT_ELF;
 347         goto fail;
 348     }
 349 #ifdef HOST_WORDS_BIGENDIAN
 350     data_order = ELFDATA2MSB;
 351 #else
 352     data_order = ELFDATA2LSB;
 353 #endif
 354     must_swab = data_order != e_ident[EI_DATA];
 355     if (big_endian) {
 356         target_data_order = ELFDATA2MSB;
 357     } else {
 358         target_data_order = ELFDATA2LSB;
 359     }
 360
 361     if (target_data_order != e_ident[EI_DATA]) {
 362         ret = ELF_LOAD_WRONG_ENDIAN;
 363         goto fail;
 364     }
 365
 366     lseek(fd, 0, SEEK_SET);
 367     if (e_ident[EI_CLASS] == ELFCLASS64) {
 368         ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
 369                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 370     } else {
 371         ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
 372                          pentry, lowaddr, highaddr, elf_machine, clear_lsb);
 373     }
 374
 375  fail:
 376     close(fd);
 377     return ret;
 378 }
 379
 380 static void bswap_uboot_header(uboot_image_header_t *hdr)
 381 {
 382 #ifndef HOST_WORDS_BIGENDIAN
 383     bswap32s(&hdr->ih_magic);
 384     bswap32s(&hdr->ih_hcrc);
 385     bswap32s(&hdr->ih_time);
 386     bswap32s(&hdr->ih_size);
 387     bswap32s(&hdr->ih_load);
 388     bswap32s(&hdr->ih_ep);
 389     bswap32s(&hdr->ih_dcrc);
 390 #endif
 391 }
 392
 393
 394 #define ZALLOC_ALIGNMENT        16
 395
 396 static void *zalloc(void *x, unsigned items, unsigned size)
 397 {
 398     void *p;
 399
 400     size *= items;
 401     size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
 402
 403     p = g_malloc(size);
 404
 405     return (p);
 406 }
 407
 408 static void zfree(void *x, void *addr)
 409 {
 410     g_free(addr);
 411 }
 412
 413
 414 #define HEAD_CRC        2
 415 #define EXTRA_FIELD     4
 416 #define ORIG_NAME       8
 417 #define COMMENT         0x10
 418 #define RESERVED        0xe0
 419
 420 #define DEFLATED        8
 421
 422 /* This is the usual maximum in uboot, so if a uImage overflows this, it would
 423  * overflow on real hardware too. */
 424 #define UBOOT_MAX_GUNZIP_BYTES (64 << 20)
 425
 426 static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
 427                       size_t srclen)
 428 {
 429     z_stream s;
 430     ssize_t dstbytes;
 431     int r, i, flags;
 432
 433     /* skip header */
 434     i = 10;
 435     flags = src[3];
 436     if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 437         puts ("Error: Bad gzipped data\n");
 438         return -1;
 439     }
 440     if ((flags & EXTRA_FIELD) != 0)
 441         i = 12 + src[10] + (src[11] << 8);
 442     if ((flags & ORIG_NAME) != 0)
 443         while (src[i++] != 0)
 444             ;
 445     if ((flags & COMMENT) != 0)
 446         while (src[i++] != 0)
 447             ;
 448     if ((flags & HEAD_CRC) != 0)
 449         i += 2;
 450     if (i >= srclen) {
 451         puts ("Error: gunzip out of data in header\n");
 452         return -1;
 453     }
 454
 455     s.zalloc = zalloc;
 456     s.zfree = zfree;
 457
 458     r = inflateInit2(&s, -MAX_WBITS);
 459     if (r != Z_OK) {
 460         printf ("Error: inflateInit2() returned %d\n", r);
 461         return (-1);
 462     }
 463     s.next_in = src + i;
 464     s.avail_in = srclen - i;
 465     s.next_out = dst;
 466     s.avail_out = dstlen;
 467     r = inflate(&s, Z_FINISH);
 468     if (r != Z_OK && r != Z_STREAM_END) {
 469         printf ("Error: inflate() returned %d\n", r);
 470         return -1;
 471     }
 472     dstbytes = s.next_out - (unsigned char *) dst;
 473     inflateEnd(&s);
 474
 475     return dstbytes;
 476 }
 477
 478 /* Load a U-Boot image.  */
 479 static int load_uboot_image(const char *filename, hwaddr *ep, hwaddr *loadaddr,
 480                             int *is_linux, uint8_t image_type)
 481 {
 482     int fd;
 483     int size;
 484     hwaddr address;
 485     uboot_image_header_t h;
 486     uboot_image_header_t *hdr = &h;
 487     uint8_t *data = NULL;
 488     int ret = -1;
 489     int do_uncompress = 0;
 490
 491     fd = open(filename, O_RDONLY | O_BINARY);
 492     if (fd < 0)
 493         return -1;
 494
 495     size = read(fd, hdr, sizeof(uboot_image_header_t));
 496     if (size < 0)
 497         goto out;
 498
 499     bswap_uboot_header(hdr);
 500
 501     if (hdr->ih_magic != IH_MAGIC)
 502         goto out;
 503
 504     if (hdr->ih_type != image_type) {
 505         fprintf(stderr, "Wrong image type %d, expected %d\n", hdr->ih_type,
 506                 image_type);
 507         goto out;
 508     }
 509
 510     /* TODO: Implement other image types.  */
 511     switch (hdr->ih_type) {
 512     case IH_TYPE_KERNEL:
 513         address = hdr->ih_load;
 514         if (loadaddr) {
 515             *loadaddr = hdr->ih_load;
 516         }
 517
 518         switch (hdr->ih_comp) {
 519         case IH_COMP_NONE:
 520             break;
 521         case IH_COMP_GZIP:
 522             do_uncompress = 1;
 523             break;
 524         default:
 525             fprintf(stderr,
 526                     "Unable to load u-boot images with compression type %d\n",
 527                     hdr->ih_comp);
 528             goto out;
 529         }
 530
 531         if (ep) {
 532             *ep = hdr->ih_ep;
 533         }
 534
 535         /* TODO: Check CPU type.  */
 536         if (is_linux) {
 537             if (hdr->ih_os == IH_OS_LINUX) {
 538                 *is_linux = 1;
 539             } else {
 540                 *is_linux = 0;
 541             }
 542         }
 543
 544         break;
 545     case IH_TYPE_RAMDISK:
 546         address = *loadaddr;
 547         break;
 548     default:
 549         fprintf(stderr, "Unsupported u-boot image type %d\n", hdr->ih_type);
 550         goto out;
 551     }
 552
 553     data = g_malloc(hdr->ih_size);
 554
 555     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 556         fprintf(stderr, "Error reading file\n");
 557         goto out;
 558     }
 559
 560     if (do_uncompress) {
 561         uint8_t *compressed_data;
 562         size_t max_bytes;
 563         ssize_t bytes;
 564
 565         compressed_data = data;
 566         max_bytes = UBOOT_MAX_GUNZIP_BYTES;
 567         data = g_malloc(max_bytes);
 568
 569         bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
 570         g_free(compressed_data);
 571         if (bytes < 0) {
 572             fprintf(stderr, "Unable to decompress gzipped image!\n");
 573             goto out;
 574         }
 575         hdr->ih_size = bytes;
 576     }
 577
 578     rom_add_blob_fixed(filename, data, hdr->ih_size, address);
 579
 580     ret = hdr->ih_size;
 581
 582 out:
 583     if (data)
 584         g_free(data);
 585     close(fd);
 586     return ret;
 587 }
 588
 589 int load_uimage(const char *filename, hwaddr *ep, hwaddr *loadaddr,
 590                 int *is_linux)
 591 {
 592     return load_uboot_image(filename, ep, loadaddr, is_linux, IH_TYPE_KERNEL);
 593 }
 594
 595 /* Load a ramdisk.  */
 596 int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz)
 597 {
 598     return load_uboot_image(filename, NULL, &addr, NULL, IH_TYPE_RAMDISK);
 599 }
 600
 601 /* This simply prevents g_malloc in the function below from allocating
 602  * a huge amount of memory, by placing a limit on the maximum
 603  * uncompressed image size that load_image_gzipped will read.
 604  */
 605 #define LOAD_IMAGE_MAX_GUNZIP_BYTES (256 << 20)
 606
 607 /* Load a gzip-compressed kernel. */
 608 int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz)
 609 {
 610     uint8_t *compressed_data = NULL;
 611     uint8_t *data = NULL;
 612     gsize len;
 613     ssize_t bytes;
 614     int ret = -1;
 615
 616     if (!g_file_get_contents(filename, (char **) &compressed_data, &len,
 617                              NULL)) {
 618         goto out;
 619     }
 620
 621     /* Is it a gzip-compressed file? */
 622     if (len < 2 ||
 623         compressed_data[0] != 0x1f ||
 624         compressed_data[1] != 0x8b) {
 625         goto out;
 626     }
 627
 628     if (max_sz > LOAD_IMAGE_MAX_GUNZIP_BYTES) {
 629         max_sz = LOAD_IMAGE_MAX_GUNZIP_BYTES;
 630     }
 631
 632     data = g_malloc(max_sz);
 633     bytes = gunzip(data, max_sz, compressed_data, len);
 634     if (bytes < 0) {
 635         fprintf(stderr, "%s: unable to decompress gzipped kernel file\n",
 636                 filename);
 637         goto out;
 638     }
 639
 640     rom_add_blob_fixed(filename, data, bytes, addr);
 641     ret = bytes;
 642
 643  out:
 644     g_free(compressed_data);
 645     g_free(data);
 646     return ret;
 647 }
 648
 649 /*
 650  * Functions for reboot-persistent memory regions.
 651  *  - used for vga bios and option roms.
 652  *  - also linux kernel (-kernel / -initrd).
 653  */
 654
 655 typedef struct Rom Rom;
 656
 657 struct Rom {
 658     char *name;
 659     char *path;
 660
 661     /* datasize is the amount of memory allocated in "data". If datasize is less
 662      * than romsize, it means that the area from datasize to romsize is filled
 663      * with zeros.
 664      */
 665     size_t romsize;
 666     size_t datasize;
 667
 668     uint8_t *data;
 669     MemoryRegion *mr;
 670     int isrom;
 671     char *fw_dir;
 672     char *fw_file;
 673
 674     hwaddr addr;
 675     QTAILQ_ENTRY(Rom) next;
 676 };
 677
 678 static FWCfgState *fw_cfg;
 679 static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
 680
 681 static void rom_insert(Rom *rom)
 682 {
 683     Rom *item;
 684
 685     if (roms_loaded) {
 686         hw_error ("ROM images must be loaded at startup\n");
 687     }
 688
 689     /* list is ordered by load address */
 690     QTAILQ_FOREACH(item, &roms, next) {
 691         if (rom->addr >= item->addr)
 692             continue;
 693         QTAILQ_INSERT_BEFORE(item, rom, next);
 694         return;
 695     }
 696     QTAILQ_INSERT_TAIL(&roms, rom, next);
 697 }
 698
 699 static void *rom_set_mr(Rom *rom, Object *owner, const char *name)
 700 {
 701     void *data;
 702
 703     rom->mr = g_malloc(sizeof(*rom->mr));
 704     memory_region_init_ram(rom->mr, owner, name, rom->datasize, &error_abort);
 705     memory_region_set_readonly(rom->mr, true);
 706     vmstate_register_ram_global(rom->mr);
 707
 708     data = memory_region_get_ram_ptr(rom->mr);
 709     memcpy(data, rom->data, rom->datasize);
 710
 711     return data;
 712 }
 713
 714 int rom_add_file(const char *file, const char *fw_dir,
 715                  hwaddr addr, int32_t bootindex,
 716                  bool option_rom)
 717 {
 718     Rom *rom;
 719     int rc, fd = -1;
 720     char devpath[100];
 721
 722     rom = g_malloc0(sizeof(*rom));
 723     rom->name = g_strdup(file);
 724     rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
 725     if (rom->path == NULL) {
 726         rom->path = g_strdup(file);
 727     }
 728
 729     fd = open(rom->path, O_RDONLY | O_BINARY);
 730     if (fd == -1) {
 731         fprintf(stderr, "Could not open option rom '%s': %s\n",
 732                 rom->path, strerror(errno));
 733         goto err;
 734     }
 735
 736     if (fw_dir) {
 737         rom->fw_dir  = g_strdup(fw_dir);
 738         rom->fw_file = g_strdup(file);
 739     }
 740     rom->addr     = addr;
 741     rom->romsize  = lseek(fd, 0, SEEK_END);
 742     rom->datasize = rom->romsize;
 743     rom->data     = g_malloc0(rom->datasize);
 744     lseek(fd, 0, SEEK_SET);
 745     rc = read(fd, rom->data, rom->datasize);
 746     if (rc != rom->datasize) {
 747         fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
 748                 rom->name, rc, rom->datasize);
 749         goto err;
 750     }
 751     close(fd);
 752     rom_insert(rom);
 753     if (rom->fw_file && fw_cfg) {
 754         const char *basename;
 755         char fw_file_name[FW_CFG_MAX_FILE_PATH];
 756         void *data;
 757
 758         basename = strrchr(rom->fw_file, '/');
 759         if (basename) {
 760             basename++;
 761         } else {
 762             basename = rom->fw_file;
 763         }
 764         snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
 765                  basename);
 766         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
 767
 768         if ((!option_rom || option_rom_has_mr) && rom_file_has_mr) {
 769             data = rom_set_mr(rom, OBJECT(fw_cfg), devpath);
 770         } else {
 771             data = rom->data;
 772         }
 773
 774         fw_cfg_add_file(fw_cfg, fw_file_name, data, rom->romsize);
 775     } else {
 776         snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
 777     }
 778
 779     add_boot_device_path(bootindex, NULL, devpath);
 780     return 0;
 781
 782 err:
 783     if (fd != -1)
 784         close(fd);
 785     g_free(rom->data);
 786     g_free(rom->path);
 787     g_free(rom->name);
 788     g_free(rom);
 789     return -1;
 790 }
 791
 792 void *rom_add_blob(const char *name, const void *blob, size_t len,
 793                    hwaddr addr, const char *fw_file_name,
 794                    FWCfgReadCallback fw_callback, void *callback_opaque)
 795 {
 796     Rom *rom;
 797     void *data = NULL;
 798
 799     rom           = g_malloc0(sizeof(*rom));
 800     rom->name     = g_strdup(name);
 801     rom->addr     = addr;
 802     rom->romsize  = len;
 803     rom->datasize = len;
 804     rom->data     = g_malloc0(rom->datasize);
 805     memcpy(rom->data, blob, len);
 806     rom_insert(rom);
 807     if (fw_file_name && fw_cfg) {
 808         char devpath[100];
 809
 810         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
 811
 812         if (rom_file_has_mr) {
 813             data = rom_set_mr(rom, OBJECT(fw_cfg), devpath);
 814         } else {
 815             data = rom->data;
 816         }
 817
 818         fw_cfg_add_file_callback(fw_cfg, fw_file_name,
 819                                  fw_callback, callback_opaque,
 820                                  data, rom->romsize);
 821     }
 822     return data;
 823 }
 824
 825 /* This function is specific for elf program because we don't need to allocate
 826  * all the rom. We just allocate the first part and the rest is just zeros. This
 827  * is why romsize and datasize are different. Also, this function seize the
 828  * memory ownership of "data", so we don't have to allocate and copy the buffer.
 829  */
 830 int rom_add_elf_program(const char *name, void *data, size_t datasize,
 831                         size_t romsize, hwaddr addr)
 832 {
 833     Rom *rom;
 834
 835     rom           = g_malloc0(sizeof(*rom));
 836     rom->name     = g_strdup(name);
 837     rom->addr     = addr;
 838     rom->datasize = datasize;
 839     rom->romsize  = romsize;
 840     rom->data     = data;
 841     rom_insert(rom);
 842     return 0;
 843 }
 844
 845 int rom_add_vga(const char *file)
 846 {
 847     return rom_add_file(file, "vgaroms", 0, -1, true);
 848 }
 849
 850 int rom_add_option(const char *file, int32_t bootindex)
 851 {
 852     return rom_add_file(file, "genroms", 0, bootindex, true);
 853 }
 854
 855 static void rom_reset(void *unused)
 856 {
 857     Rom *rom;
 858
 859     QTAILQ_FOREACH(rom, &roms, next) {
 860         if (rom->fw_file) {
 861             continue;
 862         }
 863         if (rom->data == NULL) {
 864             continue;
 865         }
 866         if (rom->mr) {
 867             void *host = memory_region_get_ram_ptr(rom->mr);
 868             memcpy(host, rom->data, rom->datasize);
 869         } else {
 870             cpu_physical_memory_write_rom(&address_space_memory,
 871                                           rom->addr, rom->data, rom->datasize);
 872         }
 873         if (rom->isrom) {
 874             /* rom needs to be written only once */
 875             g_free(rom->data);
 876             rom->data = NULL;
 877         }
 878         /*
 879          * The rom loader is really on the same level as firmware in the guest
 880          * shadowing a ROM into RAM. Such a shadowing mechanism needs to ensure
 881          * that the instruction cache for that new region is clear, so that the
 882          * CPU definitely fetches its instructions from the just written data.
 883          */
 884         cpu_flush_icache_range(rom->addr, rom->datasize);
 885     }
 886 }
 887
 888 int rom_load_all(void)
 889 {
 890     hwaddr addr = 0;
 891     MemoryRegionSection section;
 892     Rom *rom;
 893
 894     QTAILQ_FOREACH(rom, &roms, next) {
 895         if (rom->fw_file) {
 896             continue;
 897         }
 898         if (addr > rom->addr) {
 899             fprintf(stderr, "rom: requested regions overlap "
 900                     "(rom %s. free=0x" TARGET_FMT_plx
 901                     ", addr=0x" TARGET_FMT_plx ")\n",
 902                     rom->name, addr, rom->addr);
 903             return -1;
 904         }
 905         addr  = rom->addr;
 906         addr += rom->romsize;
 907         section = memory_region_find(get_system_memory(), rom->addr, 1);
 908         rom->isrom = int128_nz(section.size) && memory_region_is_rom(section.mr);
 909         memory_region_unref(section.mr);
 910     }
 911     qemu_register_reset(rom_reset, NULL);
 912     return 0;
 913 }
 914
 915 void rom_load_done(void)
 916 {
 917     roms_loaded = 1;
 918 }
 919
 920 void rom_set_fw(FWCfgState *f)
 921 {
 922     fw_cfg = f;
 923 }
 924
 925 static Rom *find_rom(hwaddr addr)
 926 {
 927     Rom *rom;
 928
 929     QTAILQ_FOREACH(rom, &roms, next) {
 930         if (rom->fw_file) {
 931             continue;
 932         }
 933         if (rom->mr) {
 934             continue;
 935         }
 936         if (rom->addr > addr) {
 937             continue;
 938         }
 939         if (rom->addr + rom->romsize < addr) {
 940             continue;
 941         }
 942         return rom;
 943     }
 944     return NULL;
 945 }
 946
 947 /*
 948  * Copies memory from registered ROMs to dest. Any memory that is contained in
 949  * a ROM between addr and addr + size is copied. Note that this can involve
 950  * multiple ROMs, which need not start at addr and need not end at addr + size.
 951  */
 952 int rom_copy(uint8_t *dest, hwaddr addr, size_t size)
 953 {
 954     hwaddr end = addr + size;
 955     uint8_t *s, *d = dest;
 956     size_t l = 0;
 957     Rom *rom;
 958
 959     QTAILQ_FOREACH(rom, &roms, next) {
 960         if (rom->fw_file) {
 961             continue;
 962         }
 963         if (rom->mr) {
 964             continue;
 965         }
 966         if (rom->addr + rom->romsize < addr) {
 967             continue;
 968         }
 969         if (rom->addr > end) {
 970             break;
 971         }
 972
 973         d = dest + (rom->addr - addr);
 974         s = rom->data;
 975         l = rom->datasize;
 976
 977         if ((d + l) > (dest + size)) {
 978             l = dest - d;
 979         }
 980
 981         if (l > 0) {
 982             memcpy(d, s, l);
 983         }
 984
 985         if (rom->romsize > rom->datasize) {
 986             /* If datasize is less than romsize, it means that we didn't
 987              * allocate all the ROM because the trailing data are only zeros.
 988              */
 989
 990             d += l;
 991             l = rom->romsize - rom->datasize;
 992
 993             if ((d + l) > (dest + size)) {
 994                 /* Rom size doesn't fit in the destination area. Adjust to avoid
 995                  * overflow.
 996                  */
 997                 l = dest - d;
 998             }
 999
1000             if (l > 0) {
1001                 memset(d, 0x0, l);
1002             }
1003         }
1004     }
1005
1006     return (d + l) - dest;
1007 }
1008
1009 void *rom_ptr(hwaddr addr)
1010 {
1011     Rom *rom;
1012
1013     rom = find_rom(addr);
1014     if (!rom || !rom->data)
1015         return NULL;
1016     return rom->data + (addr - rom->addr);
1017 }
1018
1019 void do_info_roms(Monitor *mon, const QDict *qdict)
1020 {
1021     Rom *rom;
1022
1023     QTAILQ_FOREACH(rom, &roms, next) {
1024         if (rom->mr) {
1025             monitor_printf(mon, "%s"
1026                            " size=0x%06zx name=\"%s\"\n",
1027                            memory_region_name(rom->mr),
1028                            rom->romsize,
1029                            rom->name);
1030         } else if (!rom->fw_file) {
1031             monitor_printf(mon, "addr=" TARGET_FMT_plx
1032                            " size=0x%06zx mem=%s name=\"%s\"\n",
1033                            rom->addr, rom->romsize,
1034                            rom->isrom ? "rom" : "ram",
1035                            rom->name);
1036         } else {
1037             monitor_printf(mon, "fw=%s/%s"
1038                            " size=0x%06zx name=\"%s\"\n",
1039                            rom->fw_dir,
1040                            rom->fw_file,
1041                            rom->romsize,
1042                            rom->name);
1043         }
1044     }
1045 }