narenas
/
opengnsys_ipxe
mirror of https://github.com/ipxe/ipxe.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[build] Allow genfsimg to be used on third party UEFI binaries 

Extract the PE header offset from the MZ header rather than assuming a
fixed offset as used in the binaries created by the iPXE build system.

This allows genfsimg to be used to create bootable filesystem images
from third party UEFI binaries such as the UEFI shell.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/141/merge
Michael Brown 2021-01-19 23:47:44 +00:00
parent 3a9621a6fb
commit 1173538155
1 changed files with 22 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/util/genfsimg
View File

@ -16,6 +16,18 @@ help() {
echo " -p PAD pad filesystem (in kB)"
}
# Get hex byte from binary file
#
get_byte() {
local FILENAME
local OFFSET
FILENAME="${1}"
OFFSET="${2}"
od -j "${OFFSET}" -N 1 -A n -t x1 -- "${FILENAME}" | tr -d " "
}
# Get hex word from binary file
#
get_word() {
@ -37,12 +49,18 @@ efi_boot_name() {
FILENAME="${1}"
PESIG=$(get_word "${FILENAME}" 192)
if [ "${PESIG}" != "5045" ] ; then
echo "${FILENAME}: not an EFI executable" >&2
MZSIG=$(get_word "${FILENAME}" 0)
if [ "${MZSIG}" != "4d5a" ] ; then
echo "${FILENAME}: invalid MZ header" >&2
exit 1
fi
ARCH=$(get_word "${FILENAME}" 196)
PEOFF=$(get_byte "${FILENAME}" 0x3c)
PESIG=$(get_word "${FILENAME}" "0x${PEOFF}")
if [ "${PESIG}" != "5045" ] ; then
echo "${FILENAME}: invalid PE header" >&2
exit 1
fi
ARCH=$(get_word "${FILENAME}" $(( "0x${PEOFF}" + 4 )) )
case "${ARCH}" in
"4c01" )
echo "BOOTIA32.EFI"