#!/bin/sh -x
  # Based on the vmlinux file create the System.map file
  # System.map is used by module-init tools and some debugging

  # tools to retrieve the actual addresses of symbols in the kernel.

  #
  # Usage
  # mksysmap vmlinux System.map
  
  
  #####
  # Generate System.map (actual filename passed as second argument)
  
  # $NM produces the following output:
  # f0081e80 T alloc_vfsmnt
  
  #   The second row specify the type of the symbol:
  #   A = Absolute
  #   B = Uninitialised data (.bss)
  #   C = Comon symbol
  #   D = Initialised data
  #   G = Initialised data for small objects
  #   I = Indirect reference to another symbol
  #   N = Debugging symbol
  #   R = Read only
  #   S = Uninitialised data for small objects
  #   T = Text code symbol
  #   U = Undefined symbol
  #   V = Weak symbol
  #   W = Weak symbol
  #   Corresponding small letters are local symbols
  
  # For System.map filter away:
  #   a - local absolute symbols
  #   U - undefined global symbols

  #   N - debugging symbols

  #   w - local weak symbols
  
  # readprofile starts reading symbols when _stext is found, and
  # continue until it finds a symbol which is not either of 'T', 't',

  # 'W' or 'w'. __crc_ are 'A' and placed in the middle
  # so we just ignore them to let readprofile continue to work.
  # (At least sparc64 has __crc_ in the middle).
  
  $NM -n $1 | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $2