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