FreeBSD/Linux Kernel Cross Reference
sys/scripts/mksysmap

     #!/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 = Common 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
    

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