#!/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#   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 '\( [aUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $2