linux/scripts/mksysmap
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   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 retrieve 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# $NM produces the following output:
  14# f0081e80 T alloc_vfsmnt
  15
  16#   The second row specify the type of the symbol:
  17#   A = Absolute
  18#   B = Uninitialised data (.bss)
  19#   C = Comon symbol
  20#   D = Initialised data
  21#   G = Initialised data for small objects
  22#   I = Indirect reference to another symbol
  23#   N = Debugging symbol
  24#   R = Read only
  25#   S = Uninitialised data for small objects
  26#   T = Text code symbol
  27#   U = Undefined symbol
  28#   V = Weak symbol
  29#   W = Weak symbol
  30#   Corresponding small letters are local symbols
  31
  32# For System.map filter away:
  33#   a - local absolute symbols
  34#   U - undefined global symbols
  35#   N - debugging symbols
  36#   w - local weak symbols
  37
  38# readprofile starts reading symbols when _stext is found, and
  39# continue until it finds a symbol which is not either of 'T', 't',
  40# 'W' or 'w'. __crc_ are 'A' and placed in the middle
  41# so we just ignore them to let readprofile continue to work.
  42# (At least sparc64 has __crc_ in the middle).
  43
  44$NM -n $1 | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $2
  45
  46
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