scripts/mksysmap

   1 #!/bin/sh -x
   2 # Based on the vmlinux file create the System.map file
   3 # System.map is used by module-init tools and some debugging
   4 # tools to retreive the actual addresses of symbols in the kernel.
   5 #
   6 # Usage
   7 # mksysmap vmlinux System.map
   8
   9
  10 #####
  11 # Generate System.map (actual filename passed as second argument)
  12
  13 # $NM produces the following output:
  14 # f0081e80 T alloc_vfsmnt
  15
  16 #   The second row specify the type of the symbol:
  17 #   A = Absolute
  18 #   B = Uninitialised data (.bss)
  19 #   C = Comon symbol
  20 #   D = Initialised data
  21 #   G = Initialised data for small objects
  22 #   I = Indirect reference to another symbol
  23 #   N = Debugging symbol
  24 #   R = Read only
  25 #   S = Uninitialised data for small objects
  26 #   T = Text code symbol
  27 #   U = Undefined symbol
  28 #   V = Weak symbol
  29 #   W = Weak symbol
  30 #   Corresponding small letters are local symbols
  31
  32 # For System.map filter away:
  33 #   a - local absolute symbols
  34 #   U - undefined global symbols
  35 #   w - local weak symbols
  36
  37 # readprofile starts reading symbols when _stext is found, and
  38 # continue until it finds a symbol which is not either of 'T', 't',
  39 # 'W' or 'w'. __crc_ are 'A' and placed in the middle
  40 # so we just ignore them to let readprofile continue to work.
  41 # (At least sparc64 has __crc_ in the middle).
  42
  43 $NM -n $1 | grep -v '\( [aUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $2
  44