linux/scripts/mksysmap

#!/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)
# The following refers to the symbol type as per nm(1).

# 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'.
#

${NM} -n ${1} | sed >${2} -e "
# ---------------------------------------------------------------------------
# Ignored symbol types
#

# a: local absolute symbols
# N: debugging symbols
# U: undefined global symbols
# w: local weak symbols
/ [aNUw] /d

# ---------------------------------------------------------------------------
# Ignored prefixes
#  (do not forget a space before each pattern)

# local symbols for ARM, MIPS, etc.
/ \$/d

# local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc.
/ \.L/d

# CRC from modversions
/ __crc_/d

# EXPORT_SYMBOL (symbol name)
/ __kstrtab_/d

# EXPORT_SYMBOL (namespace)
/ __kstrtabns_/d

# ---------------------------------------------------------------------------
# Ignored symbols (exact match)
#  (do not forget a space before and '$' after each pattern)

# for LoongArch?
/ L0$/d
"