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26550d1cf2
esp-idf/components/partition_table/gen_esp32part.py
Sagar Bijwe 68a9d1168f nvs_flash: Add support for nvs encryption
2018-10-04 19:25:12 +05:30

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18 KiB
Python
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#!/usr/bin/env python
#
# ESP32 partition table generation tool
#
# Converts partition tables to/from CSV and binary formats.
#
# See https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/partition-tables.html
# for explanation of partition table structure and uses.
#
# Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http:#www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function, division
import argparse
import os
import re
import struct
import sys
import hashlib
import binascii
MAX_PARTITION_LENGTH = 0xC00 # 3K for partition data (96 entries) leaves 1K in a 4K sector for signature
MD5_PARTITION_BEGIN = b"\xEB\xEB" + b"\xFF" * 14 # The first 2 bytes are like magic numbers for MD5 sum
PARTITION_TABLE_SIZE = 0x1000 # Size of partition table
__version__ = '1.1'
quiet = False
md5sum = True
secure = False
offset_part_table = 0
def status(msg):
""" Print status message to stderr """
if not quiet:
critical(msg)
def critical(msg):
""" Print critical message to stderr """
if not quiet:
sys.stderr.write(msg)
sys.stderr.write('\n')
class PartitionTable(list):
def __init__(self):
super(PartitionTable, self).__init__(self)
@classmethod
def from_csv(cls, csv_contents):
res = PartitionTable()
lines = csv_contents.splitlines()
def expand_vars(f):
f = os.path.expandvars(f)
m = re.match(r'(?<!\\)\$([A-Za-z_][A-Za-z0-9_]*)', f)
if m:
raise InputError("unknown variable '%s'" % m.group(1))
return f
for line_no in range(len(lines)):
line = expand_vars(lines[line_no]).strip()
if line.startswith("#") or len(line) == 0:
continue
try:
res.append(PartitionDefinition.from_csv(line))
except InputError as e:
raise InputError("Error at line %d: %s" % (line_no+1, e))
except Exception:
critical("Unexpected error parsing line %d: %s" % (line_no+1, line))
raise
# fix up missing offsets & negative sizes
last_end = offset_part_table + PARTITION_TABLE_SIZE # first offset after partition table
for e in res:
if offset_part_table != 0 and e.offset is not None and e.offset < last_end:
critical("WARNING: 0x%x address in the partition table is below 0x%x" % (e.offset, last_end))
e.offset = None
if e.offset is None:
pad_to = 0x10000 if e.type == PartitionDefinition.APP_TYPE else 4
if last_end % pad_to != 0:
last_end += pad_to - (last_end % pad_to)
e.offset = last_end
if e.size < 0:
e.size = -e.size - e.offset
last_end = e.offset + e.size
return res
def __getitem__(self, item):
""" Allow partition table access via name as well as by
numeric index. """
if isinstance(item, str):
for x in self:
if x.name == item:
return x
raise ValueError("No partition entry named '%s'" % item)
else:
return super(PartitionTable, self).__getitem__(item)
def find_by_type(self, ptype, subtype):
""" Return a partition by type & subtype, returns
None if not found """
TYPES = PartitionDefinition.TYPES
SUBTYPES = PartitionDefinition.SUBTYPES
# convert ptype & subtypes names (if supplied this way) to integer values
try:
ptype = TYPES[ptype]
except KeyError:
try:
ptypes = int(ptype, 0)
except TypeError:
pass
try:
subtype = SUBTYPES[int(ptype)][subtype]
except KeyError:
try:
ptypes = int(ptype, 0)
except TypeError:
pass
for p in self:
if p.type == ptype and p.subtype == subtype:
return p
return None
def find_by_name(self, name):
for p in self:
if p.name == name:
return p
return None
def verify(self):
# verify each partition individually
for p in self:
p.verify()
# check for overlaps
last = None
for p in sorted(self, key=lambda x:x.offset):
if p.offset < offset_part_table + PARTITION_TABLE_SIZE:
raise InputError("Partition offset 0x%x is below 0x%x" % (p.offset, offset_part_table + PARTITION_TABLE_SIZE))
if last is not None and p.offset < last.offset + last.size:
raise InputError("Partition at 0x%x overlaps 0x%x-0x%x" % (p.offset, last.offset, last.offset+last.size-1))
last = p
def flash_size(self):
""" Return the size that partitions will occupy in flash
(ie the offset the last partition ends at)
"""
try:
last = sorted(self, reverse=True)[0]
except IndexError:
return 0 # empty table!
return last.offset + last.size
@classmethod
def from_binary(cls, b):
md5 = hashlib.md5();
result = cls()
for o in range(0,len(b),32):
data = b[o:o+32]
if len(data) != 32:
raise InputError("Partition table length must be a multiple of 32 bytes")
if data == b'\xFF'*32:
return result # got end marker
if md5sum and data[:2] == MD5_PARTITION_BEGIN[:2]: #check only the magic number part
if data[16:] == md5.digest():
continue # the next iteration will check for the end marker
else:
raise InputError("MD5 checksums don't match! (computed: 0x%s, parsed: 0x%s)" % (md5.hexdigest(), binascii.hexlify(data[16:])))
else:
md5.update(data)
result.append(PartitionDefinition.from_binary(data))
raise InputError("Partition table is missing an end-of-table marker")
def to_binary(self):
result = b"".join(e.to_binary() for e in self)
if md5sum:
result += MD5_PARTITION_BEGIN + hashlib.md5(result).digest()
if len(result )>= MAX_PARTITION_LENGTH:
raise InputError("Binary partition table length (%d) longer than max" % len(result))
result += b"\xFF" * (MAX_PARTITION_LENGTH - len(result)) # pad the sector, for signing
return result
def to_csv(self, simple_formatting=False):
rows = [ "# Espressif ESP32 Partition Table",
"# Name, Type, SubType, Offset, Size, Flags" ]
rows += [ x.to_csv(simple_formatting) for x in self ]
return "\n".join(rows) + "\n"
class PartitionDefinition(object):
APP_TYPE = 0x00
DATA_TYPE = 0x01
TYPES = {
"app" : APP_TYPE,
"data" : DATA_TYPE,
}
# Keep this map in sync with esp_partition_subtype_t enum in esp_partition.h
SUBTYPES = {
APP_TYPE : {
"factory" : 0x00,
"test" : 0x20,
},
DATA_TYPE : {
"ota" : 0x00,
"phy" : 0x01,
"nvs" : 0x02,
"coredump" : 0x03,
"nvs_keys" : 0x04,
"esphttpd" : 0x80,
"fat" : 0x81,
"spiffs" : 0x82,
},
}
MAGIC_BYTES = b"\xAA\x50"
ALIGNMENT = {
APP_TYPE : 0x10000,
DATA_TYPE : 0x04,
}
# dictionary maps flag name (as used in CSV flags list, property name)
# to bit set in flags words in binary format
FLAGS = {
"encrypted" : 0
}
# add subtypes for the 16 OTA slot values ("ota_XX, etc.")
for ota_slot in range(16):
SUBTYPES[TYPES["app"]]["ota_%d" % ota_slot] = 0x10 + ota_slot
def __init__(self):
self.name = ""
self.type = None
self.subtype = None
self.offset = None
self.size = None
self.encrypted = False
@classmethod
def from_csv(cls, line):
""" Parse a line from the CSV """
line_w_defaults = line + ",,,," # lazy way to support default fields
fields = [ f.strip() for f in line_w_defaults.split(",") ]
res = PartitionDefinition()
res.name = fields[0]
res.type = res.parse_type(fields[1])
res.subtype = res.parse_subtype(fields[2])
res.offset = res.parse_address(fields[3])
res.size = res.parse_address(fields[4])
if res.size is None:
raise InputError("Size field can't be empty")
flags = fields[5].split(":")
for flag in flags:
if flag in cls.FLAGS:
setattr(res, flag, True)
elif len(flag) > 0:
raise InputError("CSV flag column contains unknown flag '%s'" % (flag))
return res
def __eq__(self, other):
return self.name == other.name and self.type == other.type \
and self.subtype == other.subtype and self.offset == other.offset \
and self.size == other.size
def __repr__(self):
def maybe_hex(x):
return "0x%x" % x if x is not None else "None"
return "PartitionDefinition('%s', 0x%x, 0x%x, %s, %s)" % (self.name, self.type, self.subtype or 0,
maybe_hex(self.offset), maybe_hex(self.size))
def __str__(self):
return "Part '%s' %d/%d @ 0x%x size 0x%x" % (self.name, self.type, self.subtype, self.offset or -1, self.size or -1)
def __cmp__(self, other):
return self.offset - other.offset
def __lt__(self, other):
return self.offset < other.offset
def __gt__(self, other):
return self.offset > other.offset
def __le__(self, other):
return self.offset <= other.offset
def __ge__(self, other):
return self.offset >= other.offset
def parse_type(self, strval):
if strval == "":
raise InputError("Field 'type' can't be left empty.")
return parse_int(strval, self.TYPES)
def parse_subtype(self, strval):
if strval == "":
return 0 # default
return parse_int(strval, self.SUBTYPES.get(self.type, {}))
def parse_address(self, strval):
if strval == "":
return None # PartitionTable will fill in default
return parse_int(strval)
def verify(self):
if self.type is None:
raise ValidationError(self, "Type field is not set")
if self.subtype is None:
raise ValidationError(self, "Subtype field is not set")
if self.offset is None:
raise ValidationError(self, "Offset field is not set")
align = self.ALIGNMENT.get(self.type, 4)
if self.offset % align:
raise ValidationError(self, "Offset 0x%x is not aligned to 0x%x" % (self.offset, align))
if self.size % align and secure:
raise ValidationError(self, "Size 0x%x is not aligned to 0x%x" % (self.size, align))
if self.size is None:
raise ValidationError(self, "Size field is not set")
STRUCT_FORMAT = "<2sBBLL16sL"
@classmethod
def from_binary(cls, b):
if len(b) != 32:
raise InputError("Partition definition length must be exactly 32 bytes. Got %d bytes." % len(b))
res = cls()
(magic, res.type, res.subtype, res.offset,
res.size, res.name, flags) = struct.unpack(cls.STRUCT_FORMAT, b)
if b"\x00" in res.name: # strip null byte padding from name string
res.name = res.name[:res.name.index(b"\x00")]
res.name = res.name.decode()
if magic != cls.MAGIC_BYTES:
raise InputError("Invalid magic bytes (%r) for partition definition" % magic)
for flag,bit in cls.FLAGS.items():
if flags & (1<<bit):
setattr(res, flag, True)
flags &= ~(1<<bit)
if flags != 0:
critical("WARNING: Partition definition had unknown flag(s) 0x%08x. Newer binary format?" % flags)
return res
def get_flags_list(self):
return [ flag for flag in self.FLAGS.keys() if getattr(self, flag) ]
def to_binary(self):
flags = sum((1 << self.FLAGS[flag]) for flag in self.get_flags_list())
return struct.pack(self.STRUCT_FORMAT,
self.MAGIC_BYTES,
self.type, self.subtype,
self.offset, self.size,
self.name.encode(),
flags)
def to_csv(self, simple_formatting=False):
def addr_format(a, include_sizes):
if not simple_formatting and include_sizes:
for (val, suffix) in [ (0x100000, "M"), (0x400, "K") ]:
if a % val == 0:
return "%d%s" % (a // val, suffix)
return "0x%x" % a
def lookup_keyword(t, keywords):
for k,v in keywords.items():
if simple_formatting == False and t == v:
return k
return "%d" % t
def generate_text_flags():
""" colon-delimited list of flags """
return ":".join(self.get_flags_list())
return ",".join([ self.name,
lookup_keyword(self.type, self.TYPES),
lookup_keyword(self.subtype, self.SUBTYPES.get(self.type, {})),
addr_format(self.offset, False),
addr_format(self.size, True),
generate_text_flags()])
def parse_int(v, keywords={}):
"""Generic parser for integer fields - int(x,0) with provision for
k/m/K/M suffixes and 'keyword' value lookup.
"""
try:
for letter, multiplier in [ ("k",1024), ("m",1024*1024) ]:
if v.lower().endswith(letter):
return parse_int(v[:-1], keywords) * multiplier
return int(v, 0)
except ValueError:
if len(keywords) == 0:
raise InputError("Invalid field value %s" % v)
try:
return keywords[v.lower()]
except KeyError:
raise InputError("Value '%s' is not valid. Known keywords: %s" % (v, ", ".join(keywords)))
def main():
global quiet
global md5sum
global offset_part_table
global secure
parser = argparse.ArgumentParser(description='ESP32 partition table utility')
parser.add_argument('--flash-size', help='Optional flash size limit, checks partition table fits in flash',
nargs='?', choices=[ '1MB', '2MB', '4MB', '8MB', '16MB' ])
parser.add_argument('--disable-md5sum', help='Disable md5 checksum for the partition table', default=False, action='store_true')
parser.add_argument('--verify', '-v', help='Verify partition table fields', default=True, action='store_false')
parser.add_argument('--quiet', '-q', help="Don't print status messages to stderr", action='store_true')
parser.add_argument('--offset', '-o', help='Set offset partition table', default='0x8000')
parser.add_argument('--secure', help="Require app partitions to be suitable for secure boot", action='store_true')
parser.add_argument('input', help='Path to CSV or binary file to parse. Will use stdin if omitted.', type=argparse.FileType('rb'), default=sys.stdin)
parser.add_argument('output', help='Path to output converted binary or CSV file. Will use stdout if omitted, unless the --display argument is also passed (in which case only the summary is printed.)',
nargs='?',
default='-')
args = parser.parse_args()
quiet = args.quiet
md5sum = not args.disable_md5sum
secure = args.secure
offset_part_table = int(args.offset, 0)
input = args.input.read()
input_is_binary = input[0:2] == PartitionDefinition.MAGIC_BYTES
if input_is_binary:
status("Parsing binary partition input...")
table = PartitionTable.from_binary(input)
else:
input = input.decode()
status("Parsing CSV input...")
table = PartitionTable.from_csv(input)
if args.verify:
status("Verifying table...")
table.verify()
if args.flash_size:
size_mb = int(args.flash_size.replace("MB", ""))
size = size_mb * 1024 * 1024 # flash memory uses honest megabytes!
table_size = table.flash_size()
if size < table_size:
raise InputError("Partitions defined in '%s' occupy %.1fMB of flash (%d bytes) which does not fit in configured flash size %dMB. Change the flash size in menuconfig under the 'Serial Flasher Config' menu." %
(args.input.name, table_size / 1024.0 / 1024.0, table_size, size_mb))
if input_is_binary:
output = table.to_csv()
with sys.stdout if args.output == '-' else open(args.output, 'w') as f:
f.write(output)
else:
output = table.to_binary()
with sys.stdout.buffer if args.output == '-' else open(args.output, 'wb') as f:
f.write(output)
class InputError(RuntimeError):
def __init__(self, e):
super(InputError, self).__init__(e)
class ValidationError(InputError):
def __init__(self, partition, message):
super(ValidationError, self).__init__(
"Partition %s invalid: %s" % (partition.name, message))
if __name__ == '__main__':
try:
main()
except InputError as e:
print(e, file=sys.stderr)
sys.exit(2)
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