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hex2tohex0.py
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hex2tohex0.py
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import pprint
import struct
import sys
def main():
hex2path = sys.argv[1]
hex0path = sys.argv[2]
base_address = int(sys.argv[3], 16)
labels = find_labels(hex2path, base_address)
print_replace(hex2path, hex0path, labels, base_address)
for label in ['addr_packet', 'GDT_start', 'IDT_locator_32', 'IDT_locator_16']:
if label in labels and labels[label] % 16 != 0:
print("ERROR: label %s not aligned to 16 byte boundary (%x)!" % (label, labels[label]))
sys.exit(1)
if 'past_MBR' in labels and labels['past_MBR'] != 0x7e00 and labels['past_MBR'] != 0x8000:
print("ERROR: label past_MBR is not 0x7e00 or 0x8000 (%x)" % labels['past_MBR'])
sys.exit(1)
def find_labels(hex2path, base_address):
cur_address = base_address
labels = {}
with open(hex2path, "r") as h2f:
for line in h2f:
if line[0] == ':':
if line[1:].strip() in labels:
print("ERROR: duplicate label: %s" % line[1:])
sys.exit(1)
labels[line[1:].strip()] = cur_address
else:
cur_address += count_hex(line)
return labels
def count_hex(line):
count = 0
pos = 0
while pos < len(line):
if line[pos] in ['#', ';']:
break
if line[pos].isalnum():
pos += 2
count += 1
continue
if line[pos] == '&' or line[pos] == '%':
count += 4
pos += 1
while line[pos].isalnum() or line[pos] == '_':
pos += 1
continue
if line[pos] == '$' or line[pos] == '@':
count += 2
pos += 1
while line[pos].isalnum() or line[pos] == '_':
pos += 1
continue
if line[pos] == '!':
count += 1
pos += 1
while line[pos].isalnum() or line[pos] == '_':
pos += 1
continue
pos += 1
return count
def print_replace(hex2path, hex0path, labels, base_address):
cur_address = base_address
print_header_comment = False
with open(hex2path, "r") as h2f, open(hex0path, "w") as h0f:
for line in h2f:
for label, address in labels.items():
if len(label) + 1 > len(littleendian(address)):
# the label (with &) is long and we need to pad the replaced address with extra spaces
extra_spaces = ' ' * (len(label) + 1 - len(littleendian(address)))
line = line.replace("&" + label + " ", littleendian(address) + extra_spaces + " ")
else:
# the label (with &) is short and we need to remove extra spaces to match the length of the address
extra_spaces = ' ' * (len(littleendian(address)) - (len(label) + 1))
line = line.replace("&" + label + extra_spaces + " ", littleendian(address) + " ")
# if there were no extra spaces make sure the replacement can work anyway
line = line.replace("&" + label + " ", littleendian(address) + " ")
if len(label) + 1 > len(littleendian16(address)):
# the label (with $) is long and we need to pad the replaced address with extra spaces
extra_spaces = ' ' * (len(label) + 1 - len(littleendian16(address)))
line = line.replace("$" + label + " 00 00", littleendian16(address) + " 00 00" + extra_spaces)
line = line.replace("$" + label + " 08 00", littleendian16(address) + " 08 00" + extra_spaces)
line = line.replace("$" + label + " ", littleendian16(address) + extra_spaces + " ")
else:
# the label (with $) is short and we need to remove extra spaces to match the length of the address
extra_spaces = ' ' * (len(littleendian16(address)) - (len(label) + 1))
line = line.replace("$" + label + extra_spaces + " ", littleendian16(address) + " ")
# if there were no extra spaces make sure the replacement can work anyway
line = line.replace("$" + label + " ", littleendian16(address) + " ")
# XXX these functions could probably be unified!
line = relative8bit_replace(line, cur_address, label, address)
line = relative16bit_replace(line, cur_address, label, address)
line = relative32bit_replace(line, cur_address, label, address)
if line[0] == ":" and print_header_comment:
line = line.replace(":" + label + "\n", "#[" + format(address, "04X") + "]\n#:" + label + "\n")
if line[0] == ":":
line = "#" + line
cur_address += count_hex(line)
h0f.write(line)
if line.startswith("#-"):
print_header_comment = True
else:
print_header_comment = False
def littleendian(address):
big_endian = format(address, "08X")
return big_endian[6:8] + ' ' + big_endian[4:6] + ' ' + big_endian[2:4] + ' ' + big_endian[0:2]
def littleendian16(address):
big_endian = format(address, "04X")
return big_endian[2:4] + ' ' + big_endian[0:2]
def relative8bit_replace(line, cur_address, label, address):
pos = 0
while pos < len(line):
if line[pos] in ['#', ';']:
break
if line[pos].isalnum():
pos += 2
cur_address += 1
continue
if line[pos] == '&':
return line
if line[pos] == '%':
return line
if line[pos] == '$':
return line
if line[pos] == '@':
return line
if line[pos] == '!':
cur_address += 1
pos += 1
end_pos = pos
while line[end_pos].isalnum() or line[end_pos] == '_':
end_pos += 1
if label == line[pos:end_pos]:
extra_spaces = ' ' * (end_pos - pos - 1)
if address - cur_address > 0:
line = line.replace("!" + label, format(address - cur_address, "02X") + extra_spaces)
else:
line = line.replace("!" + label, format(0x100 + address - cur_address, "02X") + extra_spaces)
return line
pos += 1
return line
def relative16bit_replace(line, cur_address, label, address):
pos = 0
while pos < len(line):
if line[pos] in ['#', ';']:
break
if line[pos].isalnum():
pos += 2
cur_address += 1
continue
if line[pos] == '&':
return line
if line[pos] == '%':
return line
if line[pos] == '$':
return line
if line[pos] == '!':
return line
if line[pos] == '@':
cur_address += 2
pos += 1
end_pos = pos
while line[end_pos].isalnum() or line[end_pos] == '_':
end_pos += 1
if label == line[pos:end_pos]:
extra_spaces = ' ' * (end_pos - pos - 4)
if address - cur_address > 0:
line = line.replace("@" + label, littleendian16(address - cur_address) + extra_spaces)
else:
line = line.replace("@" + label, littleendian16(0x10000 + address - cur_address) + extra_spaces)
return line
pos += 1
return line
def relative32bit_replace(line, cur_address, label, address):
pos = 0
while pos < len(line):
if line[pos] in ['#', ';']:
break
if line[pos].isalnum():
pos += 2
cur_address += 1
continue
if line[pos] == '&':
return line
if line[pos] == '!':
return line
if line[pos] == '$':
return line
if line[pos] == '@':
return line
if line[pos] == '%':
cur_address += 4
pos += 1
end_pos = pos
while line[end_pos].isalnum() or line[end_pos] == '_':
end_pos += 1
if label == line[pos:end_pos]:
label_len = end_pos - pos + 1
if address - cur_address > 0:
if label_len > 11:
extra_spaces = ' ' * (label_len - 11)
line = line.replace("%" + label, littleendian(address - cur_address) + extra_spaces)
else:
extra_spaces = ' ' * (11 - label_len)
line = line.replace("%" + label + extra_spaces, littleendian(address - cur_address))
else:
if label_len > 11:
extra_spaces = ' ' * (label_len - 11)
line = line.replace("%" + label, littleendian(0x100000000 + address - cur_address) + extra_spaces)
else:
extra_spaces = ' ' * (11 - label_len)
line = line.replace("%" + label + extra_spaces, littleendian(0x100000000 + address - cur_address))
return line
pos += 1
return line
if __name__ == '__main__':
main()