GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cbfstool: Deserialize CBFS master header when reading image 

Rather than  using [hn]to[nh] whenever accessing a member of the CBFS
header, deserialize the header when opening the CBFS image. The header
is no longer a pointer inside the CBFS buffer, but a separate struct,
a copy of the original header in a host-friendly format. This kills
more of the ntohl usage.

Change-Id: I5f8a5818b9d5a2d1152b1906249c4a5847d02bac
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5121
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Alexandru Gagniuc 2014-02-05 01:10:08 -06:00
parent 2516f2e467
commit c1d1fd850e
3 changed files with 58 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
util/cbfstool/cbfs_image.c
View File

@ -113,7 +113,7 @@ static int cbfs_calculate_file_header_size(const char *name)
align_up(strlen(name) + 1, CBFS_FILENAME_ALIGN));
}
static int cbfs_fix_legacy_size(struct cbfs_image *image)
static int cbfs_fix_legacy_size(struct cbfs_image *image, char *hdr_loc)
{
// A bug in old cbfstool may produce extra few bytes (by alignment) and
// cause cbfstool to overwrite things after free space -- which is
@ -125,12 +125,11 @@ static int cbfs_fix_legacy_size(struct cbfs_image *image)
entry = cbfs_find_next_entry(image, entry)) {
last = entry;
}
if ((char *)first < (char *)image->header &&
(char *)entry > (char *)image->header) {
if ((char *)first < (char *)hdr_loc &&
(char *)entry > (char *)hdr_loc) {
WARN("CBFS image was created with old cbfstool with size bug. "
"Fixing size in last entry...\n");
last->len = htonl(ntohl(last->len) -
ntohl(image->header->align));
last->len = htonl(ntohl(last->len) - image->header->align);
DEBUG("Last entry has been changed from 0x%x to 0x%x.\n",
cbfs_get_entry_addr(image, entry),
cbfs_get_entry_addr(image,
@ -154,6 +153,23 @@ void cbfs_put_header(void *dest, const struct cbfs_header *header)
xdr_be.put32(&outheader, header->offset);
xdr_be.put32(&outheader, header->architecture);
}
void cbfs_get_header(struct cbfs_header *header, const void *src)
{
struct buffer outheader;
outheader.data = (void *)src; /* We're not modifying the data */
outheader.size = 0;
header->magic = xdr_be.get32(&outheader);
header->version = xdr_be.get32(&outheader);
header->romsize = xdr_be.get32(&outheader);
header->bootblocksize = xdr_be.get32(&outheader);
header->align = xdr_be.get32(&outheader);
header->offset = xdr_be.get32(&outheader);
header->architecture = xdr_be.get32(&outheader);
}
int cbfs_image_create(struct cbfs_image *image,
uint32_t myarch,
size_t size,
@ -167,6 +183,7 @@ int cbfs_image_create(struct cbfs_image *image,
struct cbfs_file *entry;
uint32_t cbfs_len;
size_t entry_header_len;
void *header_loc;
DEBUG("cbfs_image_create: bootblock=0x%x+0x%zx, "
"header=0x%x+0x%zx, entries_offset=0x%x\n",
@ -175,7 +192,8 @@ int cbfs_image_create(struct cbfs_image *image,
if (buffer_create(&image->buffer, size, "(new)") != 0)
return -1;
image->header = NULL;
if ((image->header = malloc(sizeof(*image->header))) == NULL)
return -1;
memset(image->buffer.data, CBFS_CONTENT_DEFAULT_VALUE, size);
// Adjust legcay top-aligned address to ROM offset.
@ -214,15 +232,16 @@ int cbfs_image_create(struct cbfs_image *image,
header_offset, sizeof(header), size);
return -1;
}
image->header = (struct cbfs_header *)(image->buffer.data + header_offset);
header.magic = CBFS_HEADER_MAGIC;
header.version = CBFS_HEADER_VERSION;
header.romsize = size;
header.bootblocksize = bootblock->size;
header.align = align;
header.offset = entries_offset;
header.architecture = myarch;
cbfs_put_header(image->header, &header);
image->header->magic = CBFS_HEADER_MAGIC;
image->header->version = CBFS_HEADER_VERSION;
image->header->romsize = size;
image->header->bootblocksize = bootblock->size;
image->header->align = align;
image->header->offset = entries_offset;
image->header->architecture = myarch;
header_loc = (image->buffer.data + header_offset);
cbfs_put_header(header_loc, image->header);
// Prepare entries
if (align_up(entries_offset, align) != entries_offset) {
@ -252,18 +271,24 @@ int cbfs_image_create(struct cbfs_image *image,
int cbfs_image_from_file(struct cbfs_image *image, const char *filename)
{
void *header_loc;
if (buffer_from_file(&image->buffer, filename) != 0)
return -1;
DEBUG("read_cbfs_image: %s (%zd bytes)\n", image->buffer.name,
image->buffer.size);
image->header = cbfs_find_header(image->buffer.data,
image->buffer.size);
if (!image->header) {
header_loc = cbfs_find_header(image->buffer.data, image->buffer.size);
if (!header_loc) {
ERROR("%s does not have CBFS master header.\n", filename);
cbfs_image_delete(image);
return -1;
}
cbfs_fix_legacy_size(image);
if ((image->header = malloc(sizeof(*image->header))) == NULL)
return -1;
cbfs_get_header(image->header, header_loc);
cbfs_fix_legacy_size(image, header_loc);
return 0;
}
@ -296,7 +321,7 @@ static int cbfs_add_entry_at(struct cbfs_image *image,
uint32_t header_size = cbfs_calculate_file_header_size(name),
min_entry_size = cbfs_calculate_file_header_size("");
uint32_t len, target;
uint32_t align = ntohl(image->header->align);
uint32_t align = image->header->align;
target = content_offset - header_size;
if (target % align)
@ -372,7 +397,7 @@ int cbfs_add_entry(struct cbfs_image *image, struct buffer *buffer,
if (IS_TOP_ALIGNED_ADDRESS(content_offset)) {
// legacy cbfstool takes top-aligned address.
uint32_t theromsize = ntohl(image->header->romsize);
uint32_t theromsize = image->header->romsize;
INFO("Converting top-aligned address 0x%x to offset: 0x%x\n",
content_offset, content_offset + theromsize);
content_offset += theromsize;
@ -546,10 +571,10 @@ int cbfs_print_header_info(struct cbfs_image *image)
"alignment: %d bytes\n\n",
basename(name),
image->buffer.size / 1024,
ntohl(image->header->bootblocksize),
ntohl(image->header->romsize),
ntohl(image->header->offset),
ntohl(image->header->align));
image->header->bootblocksize,
image->header->romsize,
image->header->offset,
image->header->align);
free(name);
return 0;
}
@ -779,14 +804,14 @@ struct cbfs_file *cbfs_find_first_entry(struct cbfs_image *image)
{
assert(image && image->header);
return (struct cbfs_file *)(image->buffer.data +
ntohl(image->header->offset));
image->header->offset);
}
struct cbfs_file *cbfs_find_next_entry(struct cbfs_image *image,
struct cbfs_file *entry)
{
uint32_t addr = cbfs_get_entry_addr(image, entry);
int align = ntohl(image->header->align);
int align = image->header->align;
assert(entry && cbfs_is_valid_entry(image, entry));
addr += ntohl(entry->offset) + ntohl(entry->len);
addr = align_up(addr, align);
@ -850,7 +875,7 @@ int32_t cbfs_locate_entry(struct cbfs_image *image, const char *name,
/* Default values: allow fitting anywhere in ROM. */
if (!page_size)
page_size = ntohl(image->header->romsize);
page_size = image->header->romsize;
if (!align)
align = 1;
@ -858,9 +883,9 @@ int32_t cbfs_locate_entry(struct cbfs_image *image, const char *name,
ERROR("Input file size (%d) greater than page size (%d).\n",
size, page_size);
if (page_size % ntohl(image->header->align))
if (page_size % image->header->align)
WARN("%s: Page size (%#x) not aligned with CBFS image (%#x).\n",
__func__, page_size, ntohl(image->header->align));
__func__, page_size, image->header->align);
/* TODO Old cbfstool always assume input is a stage file (and adding
* sizeof(cbfs_stage) for header. We should fix that by adding "-t"

2
util/cbfstool/cbfs_image.h
View File

@ -34,6 +34,8 @@ struct cbfs_image {
/* Given a pointer, serialize the header from host-native byte format
* to cbfs format, i.e. big-endian. */
void cbfs_put_header(void *dest, const struct cbfs_header *header);
/* Or deserialize into host-native format */
void cbfs_get_header(struct cbfs_header *header, const void *src);
/* Creates an empty CBFS image by given size, and description to its content
* (bootblock, align, header location, starting offset of CBFS entries.

2
util/cbfstool/cbfstool.c
View File

@ -436,7 +436,7 @@ static int cbfs_locate(void)
}
if (param.top_aligned)
address = address - ntohl(image.header->romsize);
address = address - image.header->romsize;
cbfs_image_delete(&image);
printf("0x%x\n", address);