def elf2xuv(offset, elf_filename, xuv_filename=None):
"""
Reads an elf file and dumps the loadable sections in an XUV file.
The offset parameter is the number of words by which to shift the address
in the XUV file. This is usually 0.
"""
if xuv_filename is None:
xuv_filename = elf_filename.replace(".elf", ".xuv")
print "Loading elf symbols from %s" % elf_filename
layout_info = Kalimba32CoreInfo().layout_info
elfcode = ElfCodeReader(elf_filename, layout_info)
xuv_file = open(xuv_filename, "w")
xuv_file.write("// Apps Firmware image dumped from ELF by %s\n" %
sys.argv[0])
xuv_encoder = XUVStreamEncoder(xuv_file)
for section in elfcode.sections:
addr = section.paddr
data = section.data
name = section.name
print(" %s block starting at 0x%08x, %d bytes" %
(name, addr, len(data)))
words = bytes_to_words(data)
for value in words:
xuv_encoder.address_value_pair((addr + offset) / 2, value)
addr += 2
xuv_file.close()
print "Done.\nCreated %s" % xuv_filename
def pack_dir(dir_to_pack, out, packfile=DEFAULT_PACKFILE, offset=DEFAULT_OFFSET, appsfs=False):
"""
Create a filesystem image starting at the specified address offset
"""
#1. Run packfile on the specified directory
print("Packing directory...")
handle, tmp_packed_img = tempfile.mkstemp(suffix=".fs")
os.close(handle) # We close this since we need packfile to write to it first
if subprocess.call([packfile, dir_to_pack, tmp_packed_img],
stderr=subprocess.STDOUT) != 0:
raise RuntimeError("%s failed" % packfile)
#2. Translate the XUV file to the offset addresses
print("Translating filesystem image by 0x%06x" % (offset))
with open(tmp_packed_img) as raw_img:
decoder = XUVStreamDecoder(raw_img)
encoder = XUVStreamEncoder(out)
if appsfs:
profs = PackfileReadOnlyFS([(a, v) for a, v in decoder.address_value_pairs])
data = loadable_to_bytes(profs.loadable_le32, verbose=True)
if len(data) & 1:
print("padding odd length with a single byte")
data += bytearray([0xff])
addr = 0
for val in bytes_to_words(data):
encoder.address_value_pair(addr + offset, val)
addr += 1
else:
for addr, val in decoder.address_value_pairs:
encoder.address_value_pair(addr+offset, val)
os.remove(tmp_packed_img)