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 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 "hw/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 "hw/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 static int load_uboot_image(const char *filename, hwaddr *ep, hwaddr *loadaddr,
 438                             int *is_linux, uint8_t image_type)
 439 {
 440     int fd;
 441     int size;
 442     hwaddr address;
 443     uboot_image_header_t h;
 444     uboot_image_header_t *hdr = &h;
 445     uint8_t *data = NULL;
 446     int ret = -1;
 447     int do_uncompress = 0;
 448
 449     fd = open(filename, O_RDONLY | O_BINARY);
 450     if (fd < 0)
 451         return -1;
 452
 453     size = read(fd, hdr, sizeof(uboot_image_header_t));
 454     if (size < 0)
 455         goto out;
 456
 457     bswap_uboot_header(hdr);
 458
 459     if (hdr->ih_magic != IH_MAGIC)
 460         goto out;
 461
 462     if (hdr->ih_type != image_type) {
 463         fprintf(stderr, "Wrong image type %d, expected %d\n", hdr->ih_type,
 464                 image_type);
 465         goto out;
 466     }
 467
 468     /* TODO: Implement other image types.  */
 469     switch (hdr->ih_type) {
 470     case IH_TYPE_KERNEL:
 471         address = hdr->ih_load;
 472         if (loadaddr) {
 473             *loadaddr = hdr->ih_load;
 474         }
 475
 476         switch (hdr->ih_comp) {
 477         case IH_COMP_NONE:
 478             break;
 479         case IH_COMP_GZIP:
 480             do_uncompress = 1;
 481             break;
 482         default:
 483             fprintf(stderr,
 484                     "Unable to load u-boot images with compression type %d\n",
 485                     hdr->ih_comp);
 486             goto out;
 487         }
 488
 489         if (ep) {
 490             *ep = hdr->ih_ep;
 491         }
 492
 493         /* TODO: Check CPU type.  */
 494         if (is_linux) {
 495             if (hdr->ih_os == IH_OS_LINUX) {
 496                 *is_linux = 1;
 497             } else {
 498                 *is_linux = 0;
 499             }
 500         }
 501
 502         break;
 503     case IH_TYPE_RAMDISK:
 504         address = *loadaddr;
 505         break;
 506     default:
 507         fprintf(stderr, "Unsupported u-boot image type %d\n", hdr->ih_type);
 508         goto out;
 509     }
 510
 511     data = g_malloc(hdr->ih_size);
 512
 513     if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
 514         fprintf(stderr, "Error reading file\n");
 515         goto out;
 516     }
 517
 518     if (do_uncompress) {
 519         uint8_t *compressed_data;
 520         size_t max_bytes;
 521         ssize_t bytes;
 522
 523         compressed_data = data;
 524         max_bytes = UBOOT_MAX_GUNZIP_BYTES;
 525         data = g_malloc(max_bytes);
 526
 527         bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
 528         g_free(compressed_data);
 529         if (bytes < 0) {
 530             fprintf(stderr, "Unable to decompress gzipped image!\n");
 531             goto out;
 532         }
 533         hdr->ih_size = bytes;
 534     }
 535
 536     rom_add_blob_fixed(filename, data, hdr->ih_size, address);
 537
 538     ret = hdr->ih_size;
 539
 540 out:
 541     if (data)
 542         g_free(data);
 543     close(fd);
 544     return ret;
 545 }
 546
 547 int load_uimage(const char *filename, hwaddr *ep, hwaddr *loadaddr,
 548                 int *is_linux)
 549 {
 550     return load_uboot_image(filename, ep, loadaddr, is_linux, IH_TYPE_KERNEL);
 551 }
 552
 553 /* Load a ramdisk.  */
 554 int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz)
 555 {
 556     return load_uboot_image(filename, NULL, &addr, NULL, IH_TYPE_RAMDISK);
 557 }
 558
 559 /*
 560  * Functions for reboot-persistent memory regions.
 561  *  - used for vga bios and option roms.
 562  *  - also linux kernel (-kernel / -initrd).
 563  */
 564
 565 typedef struct Rom Rom;
 566
 567 struct Rom {
 568     char *name;
 569     char *path;
 570
 571     /* datasize is the amount of memory allocated in "data". If datasize is less
 572      * than romsize, it means that the area from datasize to romsize is filled
 573      * with zeros.
 574      */
 575     size_t romsize;
 576     size_t datasize;
 577
 578     uint8_t *data;
 579     int isrom;
 580     char *fw_dir;
 581     char *fw_file;
 582
 583     hwaddr addr;
 584     QTAILQ_ENTRY(Rom) next;
 585 };
 586
 587 static FWCfgState *fw_cfg;
 588 static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
 589
 590 static void rom_insert(Rom *rom)
 591 {
 592     Rom *item;
 593
 594     if (roms_loaded) {
 595         hw_error ("ROM images must be loaded at startup\n");
 596     }
 597
 598     /* list is ordered by load address */
 599     QTAILQ_FOREACH(item, &roms, next) {
 600         if (rom->addr >= item->addr)
 601             continue;
 602         QTAILQ_INSERT_BEFORE(item, rom, next);
 603         return;
 604     }
 605     QTAILQ_INSERT_TAIL(&roms, rom, next);
 606 }
 607
 608 int rom_add_file(const char *file, const char *fw_dir,
 609                  hwaddr addr, int32_t bootindex)
 610 {
 611     Rom *rom;
 612     int rc, fd = -1;
 613     char devpath[100];
 614
 615     rom = g_malloc0(sizeof(*rom));
 616     rom->name = g_strdup(file);
 617     rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
 618     if (rom->path == NULL) {
 619         rom->path = g_strdup(file);
 620     }
 621
 622     fd = open(rom->path, O_RDONLY | O_BINARY);
 623     if (fd == -1) {
 624         fprintf(stderr, "Could not open option rom '%s': %s\n",
 625                 rom->path, strerror(errno));
 626         goto err;
 627     }
 628
 629     if (fw_dir) {
 630         rom->fw_dir  = g_strdup(fw_dir);
 631         rom->fw_file = g_strdup(file);
 632     }
 633     rom->addr     = addr;
 634     rom->romsize  = lseek(fd, 0, SEEK_END);
 635     rom->datasize = rom->romsize;
 636     rom->data     = g_malloc0(rom->datasize);
 637     lseek(fd, 0, SEEK_SET);
 638     rc = read(fd, rom->data, rom->datasize);
 639     if (rc != rom->datasize) {
 640         fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
 641                 rom->name, rc, rom->datasize);
 642         goto err;
 643     }
 644     close(fd);
 645     rom_insert(rom);
 646     if (rom->fw_file && fw_cfg) {
 647         const char *basename;
 648         char fw_file_name[56];
 649
 650         basename = strrchr(rom->fw_file, '/');
 651         if (basename) {
 652             basename++;
 653         } else {
 654             basename = rom->fw_file;
 655         }
 656         snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
 657                  basename);
 658         fw_cfg_add_file(fw_cfg, fw_file_name, rom->data, rom->romsize);
 659         snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
 660     } else {
 661         snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
 662     }
 663
 664     add_boot_device_path(bootindex, NULL, devpath);
 665     return 0;
 666
 667 err:
 668     if (fd != -1)
 669         close(fd);
 670     g_free(rom->data);
 671     g_free(rom->path);
 672     g_free(rom->name);
 673     g_free(rom);
 674     return -1;
 675 }
 676
 677 int rom_add_blob(const char *name, const void *blob, size_t len,
 678                  hwaddr addr)
 679 {
 680     Rom *rom;
 681
 682     rom           = g_malloc0(sizeof(*rom));
 683     rom->name     = g_strdup(name);
 684     rom->addr     = addr;
 685     rom->romsize  = len;
 686     rom->datasize = len;
 687     rom->data     = g_malloc0(rom->datasize);
 688     memcpy(rom->data, blob, len);
 689     rom_insert(rom);
 690     return 0;
 691 }
 692
 693 /* This function is specific for elf program because we don't need to allocate
 694  * all the rom. We just allocate the first part and the rest is just zeros. This
 695  * is why romsize and datasize are different. Also, this function seize the
 696  * memory ownership of "data", so we don't have to allocate and copy the buffer.
 697  */
 698 int rom_add_elf_program(const char *name, void *data, size_t datasize,
 699                         size_t romsize, hwaddr addr)
 700 {
 701     Rom *rom;
 702
 703     rom           = g_malloc0(sizeof(*rom));
 704     rom->name     = g_strdup(name);
 705     rom->addr     = addr;
 706     rom->datasize = datasize;
 707     rom->romsize  = romsize;
 708     rom->data     = data;
 709     rom_insert(rom);
 710     return 0;
 711 }
 712
 713 int rom_add_vga(const char *file)
 714 {
 715     return rom_add_file(file, "vgaroms", 0, -1);
 716 }
 717
 718 int rom_add_option(const char *file, int32_t bootindex)
 719 {
 720     return rom_add_file(file, "genroms", 0, bootindex);
 721 }
 722
 723 static void rom_reset(void *unused)
 724 {
 725     Rom *rom;
 726
 727     QTAILQ_FOREACH(rom, &roms, next) {
 728         if (rom->fw_file) {
 729             continue;
 730         }
 731         if (rom->data == NULL) {
 732             continue;
 733         }
 734         cpu_physical_memory_write_rom(rom->addr, rom->data, rom->datasize);
 735         if (rom->isrom) {
 736             /* rom needs to be written only once */
 737             g_free(rom->data);
 738             rom->data = NULL;
 739         }
 740     }
 741 }
 742
 743 int rom_load_all(void)
 744 {
 745     hwaddr addr = 0;
 746     MemoryRegionSection section;
 747     Rom *rom;
 748
 749     QTAILQ_FOREACH(rom, &roms, next) {
 750         if (rom->fw_file) {
 751             continue;
 752         }
 753         if (addr > rom->addr) {
 754             fprintf(stderr, "rom: requested regions overlap "
 755                     "(rom %s. free=0x" TARGET_FMT_plx
 756                     ", addr=0x" TARGET_FMT_plx ")\n",
 757                     rom->name, addr, rom->addr);
 758             return -1;
 759         }
 760         addr  = rom->addr;
 761         addr += rom->romsize;
 762         section = memory_region_find(get_system_memory(), rom->addr, 1);
 763         rom->isrom = int128_nz(section.size) && memory_region_is_rom(section.mr);
 764         memory_region_unref(section.mr);
 765     }
 766     qemu_register_reset(rom_reset, NULL);
 767     roms_loaded = 1;
 768     return 0;
 769 }
 770
 771 void rom_set_fw(FWCfgState *f)
 772 {
 773     fw_cfg = f;
 774 }
 775
 776 static Rom *find_rom(hwaddr addr)
 777 {
 778     Rom *rom;
 779
 780     QTAILQ_FOREACH(rom, &roms, next) {
 781         if (rom->fw_file) {
 782             continue;
 783         }
 784         if (rom->addr > addr) {
 785             continue;
 786         }
 787         if (rom->addr + rom->romsize < addr) {
 788             continue;
 789         }
 790         return rom;
 791     }
 792     return NULL;
 793 }
 794
 795 /*
 796  * Copies memory from registered ROMs to dest. Any memory that is contained in
 797  * a ROM between addr and addr + size is copied. Note that this can involve
 798  * multiple ROMs, which need not start at addr and need not end at addr + size.
 799  */
 800 int rom_copy(uint8_t *dest, hwaddr addr, size_t size)
 801 {
 802     hwaddr end = addr + size;
 803     uint8_t *s, *d = dest;
 804     size_t l = 0;
 805     Rom *rom;
 806
 807     QTAILQ_FOREACH(rom, &roms, next) {
 808         if (rom->fw_file) {
 809             continue;
 810         }
 811         if (rom->addr + rom->romsize < addr) {
 812             continue;
 813         }
 814         if (rom->addr > end) {
 815             break;
 816         }
 817
 818         d = dest + (rom->addr - addr);
 819         s = rom->data;
 820         l = rom->datasize;
 821
 822         if ((d + l) > (dest + size)) {
 823             l = dest - d;
 824         }
 825
 826         if (l > 0) {
 827             memcpy(d, s, l);
 828         }
 829
 830         if (rom->romsize > rom->datasize) {
 831             /* If datasize is less than romsize, it means that we didn't
 832              * allocate all the ROM because the trailing data are only zeros.
 833              */
 834
 835             d += l;
 836             l = rom->romsize - rom->datasize;
 837
 838             if ((d + l) > (dest + size)) {
 839                 /* Rom size doesn't fit in the destination area. Adjust to avoid
 840                  * overflow.
 841                  */
 842                 l = dest - d;
 843             }
 844
 845             if (l > 0) {
 846                 memset(d, 0x0, l);
 847             }
 848         }
 849     }
 850
 851     return (d + l) - dest;
 852 }
 853
 854 void *rom_ptr(hwaddr addr)
 855 {
 856     Rom *rom;
 857
 858     rom = find_rom(addr);
 859     if (!rom || !rom->data)
 860         return NULL;
 861     return rom->data + (addr - rom->addr);
 862 }
 863
 864 void do_info_roms(Monitor *mon, const QDict *qdict)
 865 {
 866     Rom *rom;
 867
 868     QTAILQ_FOREACH(rom, &roms, next) {
 869         if (!rom->fw_file) {
 870             monitor_printf(mon, "addr=" TARGET_FMT_plx
 871                            " size=0x%06zx mem=%s name=\"%s\"\n",
 872                            rom->addr, rom->romsize,
 873                            rom->isrom ? "rom" : "ram",
 874                            rom->name);
 875         } else {
 876             monitor_printf(mon, "fw=%s/%s"
 877                            " size=0x%06zx name=\"%s\"\n",
 878                            rom->fw_dir,
 879                            rom->fw_file,
 880                            rom->romsize,
 881                            rom->name);
 882         }
 883     }
 884 }