linux/scripts/mksysmap at master · fabgithub/linux · GitHub

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#!/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 = Common 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

# N - debugging 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 $1 | grep -v '$ [aNUw] $\|$__crc_$\|$ \$[adt]$' > $2

linux/scripts/mksysmap at master · fabgithub/linux · GitHub

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