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authorPatrick Georgi <pgeorgi@chromium.org>2015-09-10 15:28:27 +0200
committerPatrick Georgi <pgeorgi@google.com>2015-09-21 16:03:48 +0000
commit59e52b975e3ffe29709f82e57849ccf8254b9cd1 (patch)
tree97d07360c5d1a51f54a9e2c7c8afdc35dbb2926b
parenta9992d3da5d28dc9f8423fe17497231f894fa9d9 (diff)
downloadcoreboot-59e52b975e3ffe29709f82e57849ccf8254b9cd1.tar.xz
cbfstool: add new add-master-header command
The command adds a new cbfs file, fills in the CBFS meta data in cbfs master header format, then points the master header pointer (which resides at the last 4 bytes of the CBFS region) to the data area of the new file. This can leak some space in CBFS if an old-style CBFS with native master header gets the treatment, because a new header is created and pointed at. flashmap based images have no such header, and the attempt to create a second file with the (hardcoded) name will fail. Change-Id: I5bc7fbcb5962b35a95261f30f0c93008e760680d Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11628 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
-rw-r--r--util/cbfstool/cbfstool.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c
index c45f316f6f..ed6e898f5d 100644
--- a/util/cbfstool/cbfstool.c
+++ b/util/cbfstool/cbfstool.c
@@ -19,6 +19,7 @@
* Foundation, Inc.
*/
+#include <endian.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -211,6 +212,76 @@ done:
return ret;
}
+static int cbfs_add_master_header(void)
+{
+ const char * const name = "cbfs master header";
+ struct cbfs_image image;
+ struct cbfs_file *header = NULL;
+ struct buffer buffer;
+ int ret = 1;
+
+ if (cbfs_image_from_buffer(&image, param.image_region,
+ param.headeroffset)) {
+ ERROR("Selected image region is not a CBFS.\n");
+ return 1;
+ }
+
+ if (cbfs_get_entry(&image, name)) {
+ ERROR("'%s' already in ROM image.\n", name);
+ return 1;
+ }
+
+ if (buffer_create(&buffer, sizeof(struct cbfs_header), name) != 0)
+ return 1;
+
+ struct cbfs_header *h = (struct cbfs_header *)buffer.data;
+ h->magic = htonl(CBFS_HEADER_MAGIC);
+ h->version = htonl(CBFS_HEADER_VERSION);
+ h->romsize = htonl(param.image_region->size);
+ /* The 4 bytes are left out for two reasons:
+ * 1. the cbfs master header pointer resides there
+ * 2. some cbfs implementations assume that an image that resides
+ * below 4GB has a bootblock and get confused when the end of the
+ * image is at 4GB == 0.
+ */
+ h->bootblocksize = htonl(4);
+ h->align = htonl(CBFS_ENTRY_ALIGNMENT);
+ /* offset relative to romsize above, which covers precisely the CBFS
+ * region.
+ */
+ h->offset = htonl(0);
+ h->architecture = htonl(CBFS_ARCHITECTURE_UNKNOWN);
+
+ header = cbfs_create_file_header(CBFS_COMPONENT_CBFSHEADER,
+ buffer_size(&buffer), name);
+ if (cbfs_add_entry(&image, &buffer, 0, header) != 0) {
+ ERROR("Failed to add cbfs master header into ROM image.\n");
+ goto done;
+ }
+
+ struct cbfs_file *entry;
+ if ((entry = cbfs_get_entry(&image, name)) == NULL) {
+ ERROR("'%s' not in ROM image?!?\n", name);
+ goto done;
+ }
+
+ uint32_t header_offset = CBFS_SUBHEADER(entry) -
+ buffer_get(&image.buffer);
+ header_offset = -(buffer_size(&image.buffer) - header_offset);
+
+ // TODO: when we have a BE target, we'll need to store this as BE
+ *(uint32_t *)(buffer_get(&image.buffer) +
+ buffer_size(&image.buffer) - 4) =
+ htole32(header_offset);
+
+ ret = 0;
+
+done:
+ free(header);
+ buffer_delete(&buffer);
+ return ret;
+}
+
static int cbfs_add_component(const char *filename,
const char *name,
uint32_t type,
@@ -831,6 +902,7 @@ static const struct command commands[] = {
{"add-payload", "H:r:f:n:t:c:b:C:I:vh?", cbfs_add_payload, true, true},
{"add-stage", "a:H:r:f:n:t:c:b:P:S:yvh?", cbfs_add_stage, true, true},
{"add-int", "H:r:i:n:b:vh?", cbfs_add_integer, true, true},
+ {"add-master-header", "H:r:vh?", cbfs_add_master_header, true, true},
{"copy", "H:D:s:h?", cbfs_copy, true, true},
{"create", "M:r:s:B:b:H:o:m:vh?", cbfs_create, true, true},
{"extract", "H:r:n:f:vh?", cbfs_extract, true, false},
@@ -956,6 +1028,8 @@ static void usage(char *name)
"Add a 32bit flat mode binary\n"
" add-int [-r image,regions] -i INTEGER -n NAME [-b base] "
"Add a raw 64-bit integer value\n"
+ " add-master-header [-r image,regions] "
+ "Add a legacy CBFS master header\n"
" remove [-r image,regions] -n NAME "
"Remove a component\n"
" copy -D new_header_offset -s region size \\\n"