linux-kernel-module-cheat/trace-boot

#!/usr/bin/env python3

import imp
import os
import subprocess
import re

import common
run = imp.load_source('run', os.path.join(common.root_dir, 'run'))
qemu_trace2txt = imp.load_source('qemu_trace2txt', os.path.join(common.root_dir, 'qemu-trace2txt'))

parser = common.get_argparse(argparse_args={
    'description': '''Trace the PIC addresses executed on a Linux kernel boot.

More information at: https://github.com/cirosantilli/linux-kernel-module-cheat#tracing
'''
})
parser.add_argument(
    'extra_emulator_args', nargs='*',
    help='Extra options to append at the end of the emulator command line'
)
args = common.setup(parser)
extra_args = {
    'extra_emulator_args': args.extra_emulator_args,
}
if args.gem5:
    extra_args.update({
        'eval': 'm5 exit',
        'trace': 'Exec,-ExecSymbol,-ExecMicro',
    })
    run.main(args, extra_args)
else:
    extra_args.update({
        'kernel_cli_extra': 'init=/poweroff.out',
        'trace': 'exec_tb',
    })
    run.main(args, extra_args)
    qemu_trace2txt.main()
    # Instruction count.
    # We could put this on a separate script, but it just adds more arch boilerplate to a new script.
    # So let's just leave it here for now since it did not add a significant processing time.
    kernel_entry_addr = hex(common.get_elf_entry(common.vmlinux))
    nlines = 0
    nlines_firmware = 0
    with open(common.qemu_trace_txt_file, 'r') as trace_file:
        in_firmware = True
        for line in trace_file:
            line = line.rstrip()
            nlines += 1
            pc = line.split('=')[-1]
            if pc == kernel_entry_addr:
                in_firmware = False
            if in_firmware:
                nlines_firmware += 1
    print('''\
instructions {}
entry_address {}
instructions_firmware {}\
'''.format(
        nlines,
        kernel_entry_addr,
        nlines_firmware
    ))