T Michael Turney | 540b8ec | 2020-01-24 08:42:47 -0800 | [diff] [blame] | 1 | #!/usr/bin/env python3 |
Vadim Bendebury | a85a92d | 2014-04-07 13:36:48 -0700 | [diff] [blame] | 2 | # |
Patrick Georgi | 7051707 | 2020-05-10 18:47:05 +0200 | [diff] [blame] | 3 | # SPDX-License-Identifier: BSD-3-Clause |
Vadim Bendebury | a85a92d | 2014-04-07 13:36:48 -0700 | [diff] [blame] | 4 | |
| 5 | import os |
| 6 | import struct |
| 7 | import sys |
| 8 | |
| 9 | PROG_NAME = os.path.basename(sys.argv[0]) |
| 10 | |
| 11 | def create_header(base, size): |
| 12 | """Returns a packed MBN header image with the specified base and size. |
| 13 | |
| 14 | @arg base: integer, specifies the image load address in RAM |
| 15 | @arg size: integer, specifies the size of the image |
| 16 | @returns: string, the MBN header |
| 17 | """ |
| 18 | |
| 19 | # SBLs require size to be 4 bytes aligned. |
| 20 | size = (size + 3) & 0xfffffffc |
| 21 | |
| 22 | # We currently do not support appending certificates. Signing GPL |
| 23 | # code might violate the GPL. So U-Boot will never be signed. So |
| 24 | # this is not required for U-Boot. |
| 25 | |
| 26 | header = [ |
| 27 | 0x5, # Type: APPSBL |
| 28 | 0x3, # Version: 3 |
| 29 | 0x0, # Image source pointer |
| 30 | base, # Image destination pointer |
| 31 | size, # Code Size + Cert Size + Signature Size |
| 32 | size, # Code Size |
| 33 | base + size, # Destination + Code Size |
| 34 | 0x0, # Signature Size |
| 35 | base + size, # Destination + Code Size + Signature Size |
| 36 | 0x0, # Cert Size |
| 37 | ] |
| 38 | |
| 39 | header_packed = struct.pack('<10I', *header) |
| 40 | return header_packed |
| 41 | |
| 42 | def mkheader(base_addr, infname, outfname): |
| 43 | """Prepends the image with the MBN header. |
| 44 | |
| 45 | @arg base_addr: integer, specifies the image load address in RAM |
| 46 | @arg infname: string, image filename |
| 47 | @arg outfname: string, output image with header prepended |
| 48 | @raises IOError: if reading/writing input/output file fails |
| 49 | """ |
| 50 | with open(infname, "rb") as infp: |
| 51 | image = infp.read() |
| 52 | insize = len(image) |
| 53 | |
| 54 | if base_addr > 0xFFFFFFFF: |
| 55 | raise ValueError("invalid base address") |
| 56 | |
| 57 | if base_addr + insize > 0xFFFFFFFF: |
| 58 | raise ValueError("invalid destination range") |
| 59 | |
| 60 | header = create_header(base_addr, insize) |
| 61 | with open(outfname, "wb") as outfp: |
| 62 | outfp.write(header) |
| 63 | outfp.write(image) |
| 64 | |
| 65 | def usage(msg=None): |
| 66 | """Print command usage. |
| 67 | |
| 68 | @arg msg: string, error message if any (default: None) |
| 69 | """ |
| 70 | if msg != None: |
| 71 | sys.stderr.write("%s: %s\n" % (PROG_NAME, msg)) |
| 72 | |
T Michael Turney | 540b8ec | 2020-01-24 08:42:47 -0800 | [diff] [blame] | 73 | print("Usage: %s <base-addr> <input-file> <output-file>" % PROG_NAME) |
Vadim Bendebury | a85a92d | 2014-04-07 13:36:48 -0700 | [diff] [blame] | 74 | |
| 75 | if msg != None: |
| 76 | exit(1) |
| 77 | |
| 78 | def main(): |
| 79 | """Main entry function""" |
| 80 | |
| 81 | if len(sys.argv) != 4: |
| 82 | usage("incorrect number of arguments") |
| 83 | |
| 84 | try: |
| 85 | base_addr = int(sys.argv[1], 0) |
| 86 | infname = sys.argv[2] |
| 87 | outfname = sys.argv[3] |
| 88 | except ValueError as e: |
| 89 | sys.stderr.write("mkheader: invalid base address '%s'\n" % sys.argv[1]) |
| 90 | exit(1) |
| 91 | |
| 92 | try: |
| 93 | mkheader(base_addr, infname, outfname) |
| 94 | except IOError as e: |
| 95 | sys.stderr.write("%s: %s\n" % (PROG_NAME, e)) |
| 96 | exit(1) |
| 97 | except ValueError as e: |
| 98 | sys.stderr.write("%s: %s\n" % (PROG_NAME, e)) |
| 99 | exit(1) |
| 100 | |
| 101 | if __name__ == "__main__": |
| 102 | main() |