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-rw-r--r--util/cbfstool/cbfs_image.c54
-rw-r--r--util/cbfstool/cbfstool.c120
-rw-r--r--util/cbfstool/common.h7
3 files changed, 107 insertions, 74 deletions
diff --git a/util/cbfstool/cbfs_image.c b/util/cbfstool/cbfs_image.c
index 1f60d68154..0230d8032e 100644
--- a/util/cbfstool/cbfs_image.c
+++ b/util/cbfstool/cbfs_image.c
@@ -66,13 +66,6 @@ static const struct typedesc_t types_cbfs_compression[] = {
{0, NULL},
};
-static uint32_t align_up(uint32_t value, uint32_t align)
-{
- if (value % align)
- value += align - (value % align);
- return value;
-}
-
static const char *lookup_name_by_type(const struct typedesc_t *desc, uint32_t type,
const char *default_value)
{
@@ -180,6 +173,7 @@ int cbfs_image_create(struct cbfs_image *image,
{
struct cbfs_header header;
struct cbfs_file *entry;
+ int32_t *rel_offset;
uint32_t cbfs_len;
size_t entry_header_len;
void *header_loc;
@@ -207,9 +201,6 @@ int cbfs_image_create(struct cbfs_image *image,
"header=0x%x, entries_offset=0x%x\n",
bootblock_offset, header_offset, entries_offset);
- if (align == 0)
- align = 64; // default align size.
-
// Prepare bootblock
if (bootblock_offset + bootblock->size > size) {
ERROR("Bootblock (0x%x+0x%zx) exceed ROM size (0x%zx)\n",
@@ -226,7 +217,7 @@ int cbfs_image_create(struct cbfs_image *image,
bootblock->size);
// Prepare header
- if (header_offset + sizeof(header) > size) {
+ if (header_offset + sizeof(header) > size - sizeof(int32_t)) {
ERROR("Header (0x%x+0x%zx) exceed ROM size (0x%zx)\n",
header_offset, sizeof(header), size);
return -1;
@@ -242,6 +233,14 @@ int cbfs_image_create(struct cbfs_image *image,
header_loc = (image->buffer.data + header_offset);
cbfs_put_header(header_loc, image->header);
+ // The last 4 byte of the image contain the relative offset from the end
+ // of the image to the master header as a 32-bit signed integer. x86
+ // relies on this also being its (memory-mapped, top-aligned) absolute
+ // 32-bit address by virtue of how two's complement numbers work.
+ assert(size % sizeof(int32_t) == 0);
+ rel_offset = (int32_t *)(image->buffer.data + size - sizeof(int32_t));
+ *rel_offset = header_offset - size;
+
// Prepare entries
if (align_up(entries_offset, align) != entries_offset) {
ERROR("Offset (0x%x) must be aligned to 0x%x.\n",
@@ -256,8 +255,8 @@ int cbfs_image_create(struct cbfs_image *image,
}
entry = (struct cbfs_file *)(image->buffer.data + entries_offset);
// To calculate available length, find
- // e = min(bootblock, header, size) where e > entries_offset.
- cbfs_len = size;
+ // e = min(bootblock, header, rel_offset) where e > entries_offset.
+ cbfs_len = size - sizeof(int32_t);
if (bootblock_offset > entries_offset && bootblock_offset < cbfs_len)
cbfs_len = bootblock_offset;
if (header_offset > entries_offset && header_offset < cbfs_len)
@@ -772,17 +771,21 @@ struct cbfs_header *cbfs_find_header(char *data, size_t size)
{
size_t offset;
int found = 0;
- uint32_t x86sig;
+ int32_t rel_offset;
struct cbfs_header *header, *result = NULL;
- // Try x86 style (check signature in bottom) header first.
- x86sig = *(uint32_t *)(data + size - sizeof(uint32_t));
- offset = (x86sig + (uint32_t)size);
- DEBUG("x86sig: 0x%x, offset: 0x%zx\n", x86sig, offset);
+ // Try finding relative offset of master header at end of file first.
+ rel_offset = *(int32_t *)(data + size - sizeof(int32_t));
+ offset = size + rel_offset;
+ DEBUG("relative offset: %#zx(-%#zx), offset: %#zx\n",
+ (size_t)rel_offset, (size_t)-rel_offset, offset);
if (offset >= size - sizeof(*header) ||
ntohl(((struct cbfs_header *)(data + offset))->magic) !=
- CBFS_HEADER_MAGIC)
+ CBFS_HEADER_MAGIC) {
+ // Some use cases append non-CBFS data to the end of the ROM.
+ DEBUG("relative offset seems wrong, scanning whole image...\n");
offset = 0;
+ }
for (; offset + sizeof(*header) < size; offset++) {
header = (struct cbfs_header *)(data + offset);
@@ -793,14 +796,15 @@ struct cbfs_header *cbfs_find_header(char *data, size_t size)
// Probably not a real CBFS header?
continue;
}
- found++;
- result = header;
+ if (!found++)
+ result = header;
}
- if (found > 1) {
- ERROR("multiple (%d) CBFS headers found!\n",
+ if (found > 1)
+ // Top-aligned images usually have a working relative offset
+ // field, so this is more likely to happen on bottom-aligned
+ // ones (where the first header is the "outermost" one)
+ WARN("Multiple (%d) CBFS headers found, using the first one.\n",
found);
- result = NULL;
- }
return result;
}
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c
index f57f288416..9c611197cf 100644
--- a/util/cbfstool/cbfstool.c
+++ b/util/cbfstool/cbfstool.c
@@ -53,7 +53,8 @@ static struct param {
uint32_t size;
uint32_t alignment;
uint32_t pagesize;
- uint32_t offset;
+ uint32_t cbfsoffset;
+ uint32_t cbfsoffset_assigned;
uint32_t top_aligned;
uint32_t arch;
int fit_empty_entries;
@@ -339,40 +340,58 @@ static int cbfs_create(void)
return 1;
}
- if (!param.bootblock) {
- ERROR("You need to specify -B/--bootblock.\n");
- return 1;
- }
-
if (param.arch == CBFS_ARCHITECTURE_UNKNOWN) {
ERROR("You need to specify -m/--machine arch.\n");
return 1;
}
- if (buffer_from_file(&bootblock, param.bootblock) != 0) {
+ if (!param.bootblock) {
+ DEBUG("-B not given, creating image without bootblock.\n");
+ buffer_create(&bootblock, 0, "(dummy)");
+ } else if (buffer_from_file(&bootblock, param.bootblock)) {
return 1;
}
- // Setup default boot offset and header offset.
+ if (!param.alignment)
+ param.alignment = 64; // default CBFS entry alignment
+
+ // Set default offsets. x86, as usual, needs to be a special snowflake.
if (!param.baseaddress_assigned) {
- // put boot block before end of ROM.
- param.baseaddress = param.size - bootblock.size;
- DEBUG("bootblock in end of ROM.\n");
+ if (param.arch == CBFS_ARCHITECTURE_X86) {
+ // Make sure there's at least enough room for rel_offset
+ param.baseaddress = param.size - (
+ bootblock.size > sizeof(int32_t) ?
+ bootblock.size : sizeof(int32_t));
+ DEBUG("x86 -> bootblock lies at end of ROM (%#x).\n",
+ param.baseaddress);
+ } else {
+ param.baseaddress = 0;
+ DEBUG("bootblock starts at address 0x0.\n");
+ }
}
if (!param.headeroffset_assigned) {
- // Put header before bootblock, and make a reference in end of
- // bootblock.
- param.headeroffset = (
- param.baseaddress -
- sizeof(struct cbfs_header));
- if (bootblock.size >= sizeof(uint32_t)) {
- // TODO this only works for 32b top-aligned system now...
- uint32_t ptr = param.headeroffset - param.size;
- uint32_t *sig = (uint32_t *)(bootblock.data +
- bootblock.size -
- sizeof(ptr));
- *sig = ptr;
- DEBUG("CBFS header reference in end of bootblock.\n");
+ if (param.arch == CBFS_ARCHITECTURE_X86) {
+ param.headeroffset = param.baseaddress -
+ sizeof(struct cbfs_header);
+ DEBUG("x86 -> CBFS header before bootblock (%#x).\n",
+ param.headeroffset);
+ } else {
+ param.headeroffset = align_up(param.baseaddress +
+ bootblock.size, sizeof(uint32_t));
+ DEBUG("CBFS header placed behind bootblock (%#x).\n",
+ param.headeroffset);
+ }
+ }
+ if (!param.cbfsoffset_assigned) {
+ if (param.arch == CBFS_ARCHITECTURE_X86) {
+ param.cbfsoffset = 0;
+ DEBUG("x86 -> CBFS entries start at address 0x0.\n");
+ } else {
+ param.cbfsoffset = align_up(param.headeroffset +
+ sizeof(struct cbfs_header),
+ param.alignment);
+ DEBUG("CBFS entries start beind master header (%#x).\n",
+ param.cbfsoffset);
}
}
@@ -383,7 +402,7 @@ static int cbfs_create(void)
&bootblock,
param.baseaddress,
param.headeroffset,
- param.offset) != 0) {
+ param.cbfsoffset) != 0) {
ERROR("Failed to create %s.\n", param.cbfs_name);
return 1;
}
@@ -533,28 +552,29 @@ static const struct command commands[] = {
};
static struct option long_options[] = {
- {"name", required_argument, 0, 'n' },
- {"type", required_argument, 0, 't' },
- {"compression", required_argument, 0, 'c' },
- {"base-address", required_argument, 0, 'b' },
- {"load-address", required_argument, 0, 'l' },
- {"top-aligned", required_argument, 0, 'T' },
- {"entry-point", required_argument, 0, 'e' },
- {"size", required_argument, 0, 's' },
- {"bootblock", required_argument, 0, 'B' },
- {"alignment", required_argument, 0, 'a' },
- {"page-size", required_argument, 0, 'P' },
- {"offset", required_argument, 0, 'o' },
- {"file", required_argument, 0, 'f' },
- {"int", required_argument, 0, 'i' },
- {"machine", required_argument, 0, 'm' },
- {"empty-fits", required_argument, 0, 'x' },
- {"initrd", required_argument, 0, 'I' },
- {"cmdline", required_argument, 0, 'C' },
- {"ignore-sec", required_argument, 0, 'S' },
- {"verbose", no_argument, 0, 'v' },
- {"help", no_argument, 0, 'h' },
- {NULL, 0, 0, 0 }
+ {"name", required_argument, 0, 'n' },
+ {"type", required_argument, 0, 't' },
+ {"compression", required_argument, 0, 'c' },
+ {"base-address", required_argument, 0, 'b' },
+ {"load-address", required_argument, 0, 'l' },
+ {"top-aligned", required_argument, 0, 'T' },
+ {"entry-point", required_argument, 0, 'e' },
+ {"size", required_argument, 0, 's' },
+ {"bootblock", required_argument, 0, 'B' },
+ {"header-offset", required_argument, 0, 'H' },
+ {"alignment", required_argument, 0, 'a' },
+ {"page-size", required_argument, 0, 'P' },
+ {"offset", required_argument, 0, 'o' },
+ {"file", required_argument, 0, 'f' },
+ {"int", required_argument, 0, 'i' },
+ {"machine", required_argument, 0, 'm' },
+ {"empty-fits", required_argument, 0, 'x' },
+ {"initrd", required_argument, 0, 'I' },
+ {"cmdline", required_argument, 0, 'C' },
+ {"ignore-sec", required_argument, 0, 'S' },
+ {"verbose", no_argument, 0, 'v' },
+ {"help", no_argument, 0, 'h' },
+ {NULL, 0, 0, 0 }
};
static void usage(char *name)
@@ -582,7 +602,8 @@ static void usage(char *name)
"Add a raw 64-bit integer value\n"
" remove -n NAME "
"Remove a component\n"
- " create -s size -B bootblock -m ARCH [-a align] [-o offset] "
+ " create -s size -m ARCH [-B bootblock] [-b bootblock offset] \\\n"
+ " [-o CBFS offset] [-H header offset] [-a align] "
"Create a ROM file\n"
" locate -f FILE -n NAME [-P page-size] [-a align] [-T] "
"Find a place for a file of that size\n"
@@ -694,7 +715,8 @@ int main(int argc, char **argv)
param.pagesize = strtoul(optarg, NULL, 0);
break;
case 'o':
- param.offset = strtoul(optarg, NULL, 0);
+ param.cbfsoffset = strtoul(optarg, NULL, 0);
+ param.cbfsoffset_assigned = 1;
break;
case 'f':
param.filename = optarg;
diff --git a/util/cbfstool/common.h b/util/cbfstool/common.h
index 02a1076488..0284742cb4 100644
--- a/util/cbfstool/common.h
+++ b/util/cbfstool/common.h
@@ -47,6 +47,13 @@ extern int verbose;
#define unused __attribute__((unused))
+static inline uint32_t align_up(uint32_t value, uint32_t align)
+{
+ if (value % align)
+ value += align - (value % align);
+ return value;
+}
+
/* Buffer and file I/O */
struct buffer {
char *name;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 21:39:31 +0000