util/ipqheader/ipqheader.py

   1 #!/usr/bin/python
   2 #
   3 # Copyright (c) 2013 The Linux Foundation. All rights reserved.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are met:
   7 #
   8 # 1. Redistributions of source code must retain the above copyright notice,
   9 #    this list of conditions and the following disclaimer.
  10 #
  11 # 2. Redistributions in binary form must reproduce the above copyright notice,
  12 #    this list of conditions and the following disclaimer in the documentation
  13 #    and/or other materials provided with the distribution.
  14 #
  15 # 3. Neither the name of the copyright holder nor the names of its
  16 #    contributors may be used to endorse or promote products derived from this
  17 #    software without specific prior written permission.
  18 #
  19 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  23 # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29 # POSSIBILITY OF SUCH DAMAGE.
  30 #
  31
  32 import os
  33 import struct
  34 import sys
  35
  36 PROG_NAME = os.path.basename(sys.argv[0])
  37
  38 def create_header(base, size):
  39     """Returns a packed MBN header image with the specified base and size.
  40
  41     @arg base: integer, specifies the image load address in RAM
  42     @arg size: integer, specifies the size of the image
  43     @returns: string, the MBN header
  44     """
  45
  46     # SBLs require size to be 4 bytes aligned.
  47     size = (size + 3) & 0xfffffffc
  48
  49     # We currently do not support appending certificates. Signing GPL
  50     # code might violate the GPL. So U-Boot will never be signed. So
  51     # this is not required for U-Boot.
  52
  53     header = [
  54         0x5,         # Type: APPSBL
  55         0x3,         # Version: 3
  56         0x0,         # Image source pointer
  57         base,        # Image destination pointer
  58         size,        # Code Size + Cert Size + Signature Size
  59         size,        # Code Size
  60         base + size, # Destination + Code Size
  61         0x0,         # Signature Size
  62         base + size, # Destination + Code Size + Signature Size
  63         0x0,         # Cert Size
  64     ]
  65
  66     header_packed = struct.pack('<10I', *header)
  67     return header_packed
  68
  69 def mkheader(base_addr, infname, outfname):
  70     """Prepends the image with the MBN header.
  71
  72     @arg base_addr: integer, specifies the image load address in RAM
  73     @arg infname: string, image filename
  74     @arg outfname: string, output image with header prepended
  75     @raises IOError: if reading/writing input/output file fails
  76     """
  77     with open(infname, "rb") as infp:
  78         image = infp.read()
  79         insize = len(image)
  80
  81     if base_addr > 0xFFFFFFFF:
  82         raise ValueError("invalid base address")
  83
  84     if base_addr + insize > 0xFFFFFFFF:
  85         raise ValueError("invalid destination range")
  86
  87     header = create_header(base_addr, insize)
  88     with open(outfname, "wb") as outfp:
  89         outfp.write(header)
  90         outfp.write(image)
  91
  92 def usage(msg=None):
  93     """Print command usage.
  94
  95     @arg msg: string, error message if any (default: None)
  96     """
  97     if msg != None:
  98         sys.stderr.write("%s: %s\n" % (PROG_NAME, msg))
  99
 100     print "Usage: %s <base-addr> <input-file> <output-file>" % PROG_NAME
 101
 102     if msg != None:
 103         exit(1)
 104
 105 def main():
 106     """Main entry function"""
 107
 108     if len(sys.argv) != 4:
 109         usage("incorrect number of arguments")
 110
 111     try:
 112         base_addr = int(sys.argv[1], 0)
 113         infname = sys.argv[2]
 114         outfname = sys.argv[3]
 115     except ValueError as e:
 116         sys.stderr.write("mkheader: invalid base address '%s'\n" % sys.argv[1])
 117         exit(1)
 118
 119     try:
 120         mkheader(base_addr, infname, outfname)
 121     except IOError as e:
 122         sys.stderr.write("%s: %s\n" % (PROG_NAME, e))
 123         exit(1)
 124     except ValueError as e:
 125         sys.stderr.write("%s: %s\n" % (PROG_NAME, e))
 126         exit(1)
 127
 128 if __name__ == "__main__":
 129     main()
 130