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'.
41#
42# Ignored prefixes:
43#  $                    - local symbols for ARM, MIPS, etc.
44#  .L                   - local labels, .LBB,.Ltmpxxx,.L__unnamed_xx,.LASANPC, etc.
45#  __crc_               - modversions
46#  __kstrtab_           - EXPORT_SYMBOL (symbol name)
47#  __kstrtabns_         - EXPORT_SYMBOL (namespace)
48#
49# Ignored symbols:
50#  L0                   - for LoongArch?
51
52$NM -n $1 | grep -v		\
53	-e ' [aNUw] '		\
54	-e ' \$'		\
55	-e ' \.L'		\
56	-e ' __crc_'		\
57	-e ' __kstrtab_'	\
58	-e ' __kstrtabns_'	\
59	-e ' L0$'		\
60> $2
61