script for dumping the disassambly of specific function from vmlinux

disass-fn.py

#!/usr/bin/env python3
import os, sys

fn = sys.argv[1]

f = open("./System.map")
lines = f.readlines()

candi_lines = []
for l in lines:
    if (fn in l):
        candi_lines.append(lines.index(l))

target = None

for l in candi_lines:
    if lines[l].split()[-1] == fn:
        target = l
        break

if (target):
    start_addr = lines[l].split()[0]
    end_addr = lines[l+1].split()[0]
    os.system('objdump -d ./vmlinux --start-address=0x%s --stop-address=0x%s' %(start_addr, end_addr))
else:
    print("function not found")