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qemu/hw/core/loader.c
Michael S. Tsirkin 04920fc0fa loader: store FW CFG ROM files in RAM 
ROM files that are put in FW CFG are copied to guest ram, by BIOS, but
they are not backed by RAM so they don't get migrated.

Each time we change two bytes in such a ROM this breaks cross-version
migration: since we can migrate after BIOS has read the first byte but
before it has read the second one, getting an inconsistent state.

Future-proof this by creating, for each such ROM,
an MR serving as the backing store.
This MR is never mapped into guest memory, but it's registered
as RAM so it's migrated with the guest.

Naturally, this only helps for -M 1.7 and up, older machine types
will still have the cross-version migration bug.
Luckily the race window for the problem to trigger is very small,
which is also likely why we didn't notice the cross-version
migration bug in testing yet.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2013-08-21 00:18:39 +03:00

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/*
* QEMU Executable loader
*
* Copyright (c) 2006 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* Gunzip functionality in this file is derived from u-boot:
*
* (C) Copyright 2008 Semihalf
*
* (C) Copyright 2000-2005
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw/hw.h"
#include "disas/disas.h"
#include "monitor/monitor.h"
#include "sysemu/sysemu.h"
#include "uboot_image.h"
#include "hw/loader.h"
#include "hw/nvram/fw_cfg.h"
#include "exec/memory.h"
#include "exec/address-spaces.h"
#include <zlib.h>
bool rom_file_in_ram = true;
static int roms_loaded;
/* return the size or -1 if error */
int get_image_size(const char *filename)
{
int fd, size;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = lseek(fd, 0, SEEK_END);
close(fd);
return size;
}
/* return the size or -1 if error */
/* deprecated, because caller does not specify buffer size! */
int load_image(const char *filename, uint8_t *addr)
{
int fd, size;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
if (read(fd, addr, size) != size) {
close(fd);
return -1;
}
close(fd);
return size;
}
/* read()-like version */
ssize_t read_targphys(const char *name,
int fd, hwaddr dst_addr, size_t nbytes)
{
uint8_t *buf;
ssize_t did;
buf = g_malloc(nbytes);
did = read(fd, buf, nbytes);
if (did > 0)
rom_add_blob_fixed("read", buf, did, dst_addr);
g_free(buf);
return did;
}
/* return the size or -1 if error */
int load_image_targphys(const char *filename,
hwaddr addr, uint64_t max_sz)
{
int size;
size = get_image_size(filename);
if (size > max_sz) {
return -1;
}
if (size > 0) {
rom_add_file_fixed(filename, addr, -1);
}
return size;
}
void pstrcpy_targphys(const char *name, hwaddr dest, int buf_size,
const char *source)
{
const char *nulp;
char *ptr;
if (buf_size <= 0) return;
nulp = memchr(source, 0, buf_size);
if (nulp) {
rom_add_blob_fixed(name, source, (nulp - source) + 1, dest);
} else {
rom_add_blob_fixed(name, source, buf_size, dest);
ptr = rom_ptr(dest + buf_size - 1);
*ptr = 0;
}
}
/* A.OUT loader */
struct exec
{
uint32_t a_info; /* Use macros N_MAGIC, etc for access */
uint32_t a_text; /* length of text, in bytes */
uint32_t a_data; /* length of data, in bytes */
uint32_t a_bss; /* length of uninitialized data area, in bytes */
uint32_t a_syms; /* length of symbol table data in file, in bytes */
uint32_t a_entry; /* start address */
uint32_t a_trsize; /* length of relocation info for text, in bytes */
uint32_t a_drsize; /* length of relocation info for data, in bytes */
};
static void bswap_ahdr(struct exec *e)
{
bswap32s(&e->a_info);
bswap32s(&e->a_text);
bswap32s(&e->a_data);
bswap32s(&e->a_bss);
bswap32s(&e->a_syms);
bswap32s(&e->a_entry);
bswap32s(&e->a_trsize);
bswap32s(&e->a_drsize);
}
#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#define OMAGIC 0407
#define NMAGIC 0410
#define ZMAGIC 0413
#define QMAGIC 0314
#define _N_HDROFF(x) (1024 - sizeof (struct exec))
#define N_TXTOFF(x) \
(N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \
(N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
#define N_TXTADDR(x, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0)
#define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1))
#define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text)
#define N_DATADDR(x, target_page_size) \
(N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \
: (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size)))
int load_aout(const char *filename, hwaddr addr, int max_sz,
int bswap_needed, hwaddr target_page_size)
{
int fd;
ssize_t size, ret;
struct exec e;
uint32_t magic;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = read(fd, &e, sizeof(e));
if (size < 0)
goto fail;
if (bswap_needed) {
bswap_ahdr(&e);
}
magic = N_MAGIC(e);
switch (magic) {
case ZMAGIC:
case QMAGIC:
case OMAGIC:
if (e.a_text + e.a_data > max_sz)
goto fail;
lseek(fd, N_TXTOFF(e), SEEK_SET);
size = read_targphys(filename, fd, addr, e.a_text + e.a_data);
if (size < 0)
goto fail;
break;
case NMAGIC:
if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
goto fail;
lseek(fd, N_TXTOFF(e), SEEK_SET);
size = read_targphys(filename, fd, addr, e.a_text);
if (size < 0)
goto fail;
ret = read_targphys(filename, fd, addr + N_DATADDR(e, target_page_size),
e.a_data);
if (ret < 0)
goto fail;
size += ret;
break;
default:
goto fail;
}
close(fd);
return size;
fail:
close(fd);
return -1;
}
/* ELF loader */
static void *load_at(int fd, int offset, int size)
{
void *ptr;
if (lseek(fd, offset, SEEK_SET) < 0)
return NULL;
ptr = g_malloc(size);
if (read(fd, ptr, size) != size) {
g_free(ptr);
return NULL;
}
return ptr;
}
#ifdef ELF_CLASS
#undef ELF_CLASS
#endif
#define ELF_CLASS ELFCLASS32
#include "elf.h"
#define SZ 32
#define elf_word uint32_t
#define elf_sword int32_t
#define bswapSZs bswap32s
#include "hw/elf_ops.h"
#undef elfhdr
#undef elf_phdr
#undef elf_shdr
#undef elf_sym
#undef elf_note
#undef elf_word
#undef elf_sword
#undef bswapSZs
#undef SZ
#define elfhdr elf64_hdr
#define elf_phdr elf64_phdr
#define elf_note elf64_note
#define elf_shdr elf64_shdr
#define elf_sym elf64_sym
#define elf_word uint64_t
#define elf_sword int64_t
#define bswapSZs bswap64s
#define SZ 64
#include "hw/elf_ops.h"
/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, int big_endian, int elf_machine, int clear_lsb)
{
int fd, data_order, target_data_order, must_swab, ret;
uint8_t e_ident[EI_NIDENT];
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
perror(filename);
return -1;
}
if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
goto fail;
if (e_ident[0] != ELFMAG0 ||
e_ident[1] != ELFMAG1 ||
e_ident[2] != ELFMAG2 ||
e_ident[3] != ELFMAG3)
goto fail;
#ifdef HOST_WORDS_BIGENDIAN
data_order = ELFDATA2MSB;
#else
data_order = ELFDATA2LSB;
#endif
must_swab = data_order != e_ident[EI_DATA];
if (big_endian) {
target_data_order = ELFDATA2MSB;
} else {
target_data_order = ELFDATA2LSB;
}
if (target_data_order != e_ident[EI_DATA]) {
goto fail;
}
lseek(fd, 0, SEEK_SET);
if (e_ident[EI_CLASS] == ELFCLASS64) {
ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
pentry, lowaddr, highaddr, elf_machine, clear_lsb);
} else {
ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
pentry, lowaddr, highaddr, elf_machine, clear_lsb);
}
close(fd);
return ret;
fail:
close(fd);
return -1;
}
static void bswap_uboot_header(uboot_image_header_t *hdr)
{
#ifndef HOST_WORDS_BIGENDIAN
bswap32s(&hdr->ih_magic);
bswap32s(&hdr->ih_hcrc);
bswap32s(&hdr->ih_time);
bswap32s(&hdr->ih_size);
bswap32s(&hdr->ih_load);
bswap32s(&hdr->ih_ep);
bswap32s(&hdr->ih_dcrc);
#endif
}
#define ZALLOC_ALIGNMENT 16
static void *zalloc(void *x, unsigned items, unsigned size)
{
void *p;
size *= items;
size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
p = g_malloc(size);
return (p);
}
static void zfree(void *x, void *addr)
{
g_free(addr);
}
#define HEAD_CRC 2
#define EXTRA_FIELD 4
#define ORIG_NAME 8
#define COMMENT 0x10
#define RESERVED 0xe0
#define DEFLATED 8
/* This is the usual maximum in uboot, so if a uImage overflows this, it would
* overflow on real hardware too. */
#define UBOOT_MAX_GUNZIP_BYTES (64 << 20)
static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
size_t srclen)
{
z_stream s;
ssize_t dstbytes;
int r, i, flags;
/* skip header */
i = 10;
flags = src[3];
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
puts ("Error: Bad gzipped data\n");
return -1;
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= srclen) {
puts ("Error: gunzip out of data in header\n");
return -1;
}
s.zalloc = zalloc;
s.zfree = zfree;
r = inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
printf ("Error: inflateInit2() returned %d\n", r);
return (-1);
}
s.next_in = src + i;
s.avail_in = srclen - i;
s.next_out = dst;
s.avail_out = dstlen;
r = inflate(&s, Z_FINISH);
if (r != Z_OK && r != Z_STREAM_END) {
printf ("Error: inflate() returned %d\n", r);
return -1;
}
dstbytes = s.next_out - (unsigned char *) dst;
inflateEnd(&s);
return dstbytes;
}
/* Load a U-Boot image. */
static int load_uboot_image(const char *filename, hwaddr *ep, hwaddr *loadaddr,
int *is_linux, uint8_t image_type)
{
int fd;
int size;
hwaddr address;
uboot_image_header_t h;
uboot_image_header_t *hdr = &h;
uint8_t *data = NULL;
int ret = -1;
int do_uncompress = 0;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = read(fd, hdr, sizeof(uboot_image_header_t));
if (size < 0)
goto out;
bswap_uboot_header(hdr);
if (hdr->ih_magic != IH_MAGIC)
goto out;
if (hdr->ih_type != image_type) {
fprintf(stderr, "Wrong image type %d, expected %d\n", hdr->ih_type,
image_type);
goto out;
}
/* TODO: Implement other image types. */
switch (hdr->ih_type) {
case IH_TYPE_KERNEL:
address = hdr->ih_load;
if (loadaddr) {
*loadaddr = hdr->ih_load;
}
switch (hdr->ih_comp) {
case IH_COMP_NONE:
break;
case IH_COMP_GZIP:
do_uncompress = 1;
break;
default:
fprintf(stderr,
"Unable to load u-boot images with compression type %d\n",
hdr->ih_comp);
goto out;
}
if (ep) {
*ep = hdr->ih_ep;
}
/* TODO: Check CPU type. */
if (is_linux) {
if (hdr->ih_os == IH_OS_LINUX) {
*is_linux = 1;
} else {
*is_linux = 0;
}
}
break;
case IH_TYPE_RAMDISK:
address = *loadaddr;
break;
default:
fprintf(stderr, "Unsupported u-boot image type %d\n", hdr->ih_type);
goto out;
}
data = g_malloc(hdr->ih_size);
if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
fprintf(stderr, "Error reading file\n");
goto out;
}
if (do_uncompress) {
uint8_t *compressed_data;
size_t max_bytes;
ssize_t bytes;
compressed_data = data;
max_bytes = UBOOT_MAX_GUNZIP_BYTES;
data = g_malloc(max_bytes);
bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
g_free(compressed_data);
if (bytes < 0) {
fprintf(stderr, "Unable to decompress gzipped image!\n");
goto out;
}
hdr->ih_size = bytes;
}
rom_add_blob_fixed(filename, data, hdr->ih_size, address);
ret = hdr->ih_size;
out:
if (data)
g_free(data);
close(fd);
return ret;
}
int load_uimage(const char *filename, hwaddr *ep, hwaddr *loadaddr,
int *is_linux)
{
return load_uboot_image(filename, ep, loadaddr, is_linux, IH_TYPE_KERNEL);
}
/* Load a ramdisk. */
int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz)
{
return load_uboot_image(filename, NULL, &addr, NULL, IH_TYPE_RAMDISK);
}
/*
* Functions for reboot-persistent memory regions.
* - used for vga bios and option roms.
* - also linux kernel (-kernel / -initrd).
*/
typedef struct Rom Rom;
struct Rom {
char *name;
char *path;
/* datasize is the amount of memory allocated in "data". If datasize is less
* than romsize, it means that the area from datasize to romsize is filled
* with zeros.
*/
size_t romsize;
size_t datasize;
uint8_t *data;
MemoryRegion *mr;
int isrom;
char *fw_dir;
char *fw_file;
hwaddr addr;
QTAILQ_ENTRY(Rom) next;
};
static FWCfgState *fw_cfg;
static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
static void rom_insert(Rom *rom)
{
Rom *item;
if (roms_loaded) {
hw_error ("ROM images must be loaded at startup\n");
}
/* list is ordered by load address */
QTAILQ_FOREACH(item, &roms, next) {
if (rom->addr >= item->addr)
continue;
QTAILQ_INSERT_BEFORE(item, rom, next);
return;
}
QTAILQ_INSERT_TAIL(&roms, rom, next);
}
static void *rom_set_mr(Rom *rom, Object *owner, const char *name)
{
void *data;
rom->mr = g_malloc(sizeof(*rom->mr));
memory_region_init_ram(rom->mr, owner, name, rom->datasize);
memory_region_set_readonly(rom->mr, true);
vmstate_register_ram_global(rom->mr);
data = memory_region_get_ram_ptr(rom->mr);
memcpy(data, rom->data, rom->datasize);
return data;
}
int rom_add_file(const char *file, const char *fw_dir,
hwaddr addr, int32_t bootindex)
{
Rom *rom;
int rc, fd = -1;
char devpath[100];
rom = g_malloc0(sizeof(*rom));
rom->name = g_strdup(file);
rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
if (rom->path == NULL) {
rom->path = g_strdup(file);
}
fd = open(rom->path, O_RDONLY | O_BINARY);
if (fd == -1) {
fprintf(stderr, "Could not open option rom '%s': %s\n",
rom->path, strerror(errno));
goto err;
}
if (fw_dir) {
rom->fw_dir = g_strdup(fw_dir);
rom->fw_file = g_strdup(file);
}
rom->addr = addr;
rom->romsize = lseek(fd, 0, SEEK_END);
rom->datasize = rom->romsize;
rom->data = g_malloc0(rom->datasize);
lseek(fd, 0, SEEK_SET);
rc = read(fd, rom->data, rom->datasize);
if (rc != rom->datasize) {
fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
rom->name, rc, rom->datasize);
goto err;
}
close(fd);
rom_insert(rom);
if (rom->fw_file && fw_cfg) {
const char *basename;
char fw_file_name[56];
void *data;
basename = strrchr(rom->fw_file, '/');
if (basename) {
basename++;
} else {
basename = rom->fw_file;
}
snprintf(fw_file_name, sizeof(fw_file_name), "%s/%s", rom->fw_dir,
basename);
snprintf(devpath, sizeof(devpath), "/rom@%s", fw_file_name);
if (rom_file_in_ram) {
data = rom_set_mr(rom, OBJECT(fw_cfg), devpath);
} else {
data = rom->data;
}
fw_cfg_add_file(fw_cfg, fw_file_name, data, rom->romsize);
} else {
snprintf(devpath, sizeof(devpath), "/rom@" TARGET_FMT_plx, addr);
}
add_boot_device_path(bootindex, NULL, devpath);
return 0;
err:
if (fd != -1)
close(fd);
g_free(rom->data);
g_free(rom->path);
g_free(rom->name);
g_free(rom);
return -1;
}
int rom_add_blob(const char *name, const void *blob, size_t len,
hwaddr addr)
{
Rom *rom;
rom = g_malloc0(sizeof(*rom));
rom->name = g_strdup(name);
rom->addr = addr;
rom->romsize = len;
rom->datasize = len;
rom->data = g_malloc0(rom->datasize);
memcpy(rom->data, blob, len);
rom_insert(rom);
return 0;
}
/* This function is specific for elf program because we don't need to allocate
* all the rom. We just allocate the first part and the rest is just zeros. This
* is why romsize and datasize are different. Also, this function seize the
* memory ownership of "data", so we don't have to allocate and copy the buffer.
*/
int rom_add_elf_program(const char *name, void *data, size_t datasize,
size_t romsize, hwaddr addr)
{
Rom *rom;
rom = g_malloc0(sizeof(*rom));
rom->name = g_strdup(name);
rom->addr = addr;
rom->datasize = datasize;
rom->romsize = romsize;
rom->data = data;
rom_insert(rom);
return 0;
}
int rom_add_vga(const char *file)
{
return rom_add_file(file, "vgaroms", 0, -1);
}
int rom_add_option(const char *file, int32_t bootindex)
{
return rom_add_file(file, "genroms", 0, bootindex);
}
static void rom_reset(void *unused)
{
Rom *rom;
QTAILQ_FOREACH(rom, &roms, next) {
if (rom->fw_file) {
continue;
}
if (rom->data == NULL) {
continue;
}
if (rom->mr) {
void *host = memory_region_get_ram_ptr(rom->mr);
memcpy(host, rom->data, rom->datasize);
} else {
cpu_physical_memory_write_rom(rom->addr, rom->data, rom->datasize);
}
if (rom->isrom) {
/* rom needs to be written only once */
g_free(rom->data);
rom->data = NULL;
}
}
}
int rom_load_all(void)
{
hwaddr addr = 0;
MemoryRegionSection section;
Rom *rom;
QTAILQ_FOREACH(rom, &roms, next) {
if (rom->fw_file) {
continue;
}
if (addr > rom->addr) {
fprintf(stderr, "rom: requested regions overlap "
"(rom %s. free=0x" TARGET_FMT_plx
", addr=0x" TARGET_FMT_plx ")\n",
rom->name, addr, rom->addr);
return -1;
}
addr = rom->addr;
addr += rom->romsize;
section = memory_region_find(get_system_memory(), rom->addr, 1);
rom->isrom = int128_nz(section.size) && memory_region_is_rom(section.mr);
memory_region_unref(section.mr);
}
qemu_register_reset(rom_reset, NULL);
roms_loaded = 1;
return 0;
}
void rom_set_fw(FWCfgState *f)
{
fw_cfg = f;
}
static Rom *find_rom(hwaddr addr)
{
Rom *rom;
QTAILQ_FOREACH(rom, &roms, next) {
if (rom->fw_file) {
continue;
}
if (rom->mr) {
continue;
}
if (rom->addr > addr) {
continue;
}
if (rom->addr + rom->romsize < addr) {
continue;
}
return rom;
}
return NULL;
}
/*
* Copies memory from registered ROMs to dest. Any memory that is contained in
* a ROM between addr and addr + size is copied. Note that this can involve
* multiple ROMs, which need not start at addr and need not end at addr + size.
*/
int rom_copy(uint8_t *dest, hwaddr addr, size_t size)
{
hwaddr end = addr + size;
uint8_t *s, *d = dest;
size_t l = 0;
Rom *rom;
QTAILQ_FOREACH(rom, &roms, next) {
if (rom->fw_file) {
continue;
}
if (rom->mr) {
continue;
}
if (rom->addr + rom->romsize < addr) {
continue;
}
if (rom->addr > end) {
break;
}
d = dest + (rom->addr - addr);
s = rom->data;
l = rom->datasize;
if ((d + l) > (dest + size)) {
l = dest - d;
}
if (l > 0) {
memcpy(d, s, l);
}
if (rom->romsize > rom->datasize) {
/* If datasize is less than romsize, it means that we didn't
* allocate all the ROM because the trailing data are only zeros.
*/
d += l;
l = rom->romsize - rom->datasize;
if ((d + l) > (dest + size)) {
/* Rom size doesn't fit in the destination area. Adjust to avoid
* overflow.
*/
l = dest - d;
}
if (l > 0) {
memset(d, 0x0, l);
}
}
}
return (d + l) - dest;
}
void *rom_ptr(hwaddr addr)
{
Rom *rom;
rom = find_rom(addr);
if (!rom || !rom->data)
return NULL;
return rom->data + (addr - rom->addr);
}
void do_info_roms(Monitor *mon, const QDict *qdict)
{
Rom *rom;
QTAILQ_FOREACH(rom, &roms, next) {
if (rom->mr) {
monitor_printf(mon, "%s"
" size=0x%06zx name=\"%s\"\n",
rom->mr->name,
rom->romsize,
rom->name);
} else if (!rom->fw_file) {
monitor_printf(mon, "addr=" TARGET_FMT_plx
" size=0x%06zx mem=%s name=\"%s\"\n",
rom->addr, rom->romsize,
rom->isrom ? "rom" : "ram",
rom->name);
} else {
monitor_printf(mon, "fw=%s/%s"
" size=0x%06zx name=\"%s\"\n",
rom->fw_dir,
rom->fw_file,
rom->romsize,
rom->name);
}
}
}
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