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#!/usr/bin/env python3
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2017, 2020, Linaro Limited
# Copyright (c) 2020-2023, Arm Limited.
#
import argparse
import array
from elftools.elf.elffile import ELFFile, ELFError
from elftools.elf.sections import SymbolTableSection
import os
import re
import struct
import uuid
import zlib
def get_args():
parser = argparse.ArgumentParser(
description='Converts a Trusted '
'Application ELF file into a C source file, ready for '
'inclusion in the TEE binary as an "early TA".')
parser.add_argument('--out', required=True,
help='Name of the output C file')
parser.add_argument(
'--ta',
required=False,
help='Path to the TA binary. File name has to be: <uuid>.* '
'such as: 8aaaf200-2450-11e4-abe2-0002a5d5c51b.stripped.elf')
parser.add_argument(
'--sp',
required=False,
help='Path to the SP binary. File name has to be: <uuid>.* '
'such as: 8aaaf200-2450-11e4-abe2-0002a5d5c51b.stripped.elf')
parser.add_argument(
'--compress',
dest="compress",
action="store_true",
help='Compress the image using the DEFLATE '
'algorithm')
parser.add_argument(
'--manifest',
dest="manifest",
required=False,
help='path to the SP manifest file')
return parser.parse_args()
def get_name(obj):
# Symbol or section .name can be a byte array or a string, we want a string
try:
name = obj.name.decode()
except (UnicodeDecodeError, AttributeError):
name = obj.name
return name
def ta_get_flags(ta_f):
with open(ta_f, 'rb') as f:
elffile = ELFFile(f)
for s in elffile.iter_sections():
if isinstance(s, SymbolTableSection):
for symbol in s.iter_symbols():
if symbol.name == 'ta_head':
# Get the section containing the symbol
s2 = elffile.get_section(symbol.entry['st_shndx'])
offs = s2.header['sh_offset'] - s2.header['sh_addr']
# ta_head offset into ELF binary
offs = offs + symbol.entry['st_value']
offs = offs + 20 # Flags offset in ta_head
f.seek(offs)
flags = struct.unpack('<I', f.read(4))[0]
return flags
# For compatibility with older TAs
for s in elffile.iter_sections():
if get_name(s) == '.ta_head':
return struct.unpack('<16x4xI', s.data()[:24])[0]
raise Exception('.ta_head section not found')
def sp_get_flags(sp_f):
with open(sp_f, 'rb') as f:
try:
elffile = ELFFile(f)
except ELFError:
# Binary format SP, return zero flags
return 0
for s in elffile.iter_sections():
if get_name(s) == '.sp_head':
return struct.unpack('<16x4xI', s.data()[:24])[0]
raise Exception('.sp_head section not found')
def dump_bin(f, ts, compress):
with open(ts, 'rb') as _ts:
bytes = _ts.read()
uncompressed_size = len(bytes)
if compress:
bytes = zlib.compress(bytes)
size = len(bytes)
i = 0
while i < size:
if i % 8 == 0:
f.write('\t\t')
f.write(hex(bytes[i]) + ',')
i = i + 1
if i % 8 == 0 or i == size:
f.write('\n')
else:
f.write(' ')
return (size, uncompressed_size)
def main():
args = get_args()
is_sp = False
if args.ta is None and args.sp is None:
raise Exception('The --ta or the --sp flag is required')
if args.ta is not None and args.sp is not None:
raise Exception('The --ta and the --sp can\'t be combined')
if args.ta is not None:
ts = args.ta
is_sp = False
if args.sp is not None:
ts = args.sp
is_sp = True
ts_uuid = uuid.UUID(re.sub(r'\..*', '', os.path.basename(ts)))
f = open(args.out, 'w')
f.write('/* Generated from ' + ts + ' by ' +
os.path.basename(__file__) + ' */\n\n')
f.write('#include <kernel/embedded_ts.h>\n\n')
f.write('#include <scattered_array.h>\n\n')
f.write('const uint8_t ts_bin_' + ts_uuid.hex + '[] = {\n')
ts_size, ts_uncompressed_size = dump_bin(f, ts, args.compress)
f.write('};\n')
if is_sp:
f.write('#include <kernel/secure_partition.h>\n\n')
f.write('const uint8_t fdt_bin_' + ts_uuid.hex + '[] = {\n')
dump_bin(f, args.manifest, False)
f.write('};\n')
f.write('SCATTERED_ARRAY_DEFINE_PG_ITEM(sp_images, struct \
sp_image) = {\n')
f.write('\t.fdt = fdt_bin_' + ts_uuid.hex + ',\n')
f.write('. image = {')
f.write('\t.flags = 0x{:04x},\n'.format(sp_get_flags(ts)))
else:
f.write('SCATTERED_ARRAY_DEFINE_PG_ITEM(early_tas, struct \
embedded_ts) = {\n')
f.write('\t.flags = 0x{:04x},\n'.format(ta_get_flags(ts)))
f.write('\t.uuid = {\n')
f.write('\t\t.timeLow = 0x{:08x},\n'.format(ts_uuid.time_low))
f.write('\t\t.timeMid = 0x{:04x},\n'.format(ts_uuid.time_mid))
f.write('\t\t.timeHiAndVersion = ' +
'0x{:04x},\n'.format(ts_uuid.time_hi_version))
f.write('\t\t.clockSeqAndNode = {\n')
csn = '{0:02x}{1:02x}{2:012x}'.format(ts_uuid.clock_seq_hi_variant,
ts_uuid.clock_seq_low, ts_uuid.node)
f.write('\t\t\t')
f.write(', '.join('0x' + csn[i:i + 2] for i in range(0, len(csn), 2)))
f.write('\n\t\t},\n\t},\n')
f.write('\t.size = sizeof(ts_bin_' + ts_uuid.hex +
'), /* {:d} */\n'.format(ts_size))
f.write('\t.ts = ts_bin_' + ts_uuid.hex + ',\n')
if args.compress:
f.write('\t.uncompressed_size = '
'{:d},\n'.format(ts_uncompressed_size))
if is_sp:
f.write('}\n')
f.write('};\n')
f.close()
if __name__ == "__main__":
main()
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