At first, to be able to write a plugins in Python for radare2 you need to install r2lang plugin. If you're going to use Python 2, then use r2pm -i lang-python2, otherwise (and recommended) - install the Python 3 version: r2pm -i lang-python3. Note - in the following examples there are missing functions of the actual decoding for the sake of readability!
For this you need to do this: 1. import r2lang and from r2lang import R (for constants) 2. Make a function with 2 subfunctions - assemble and disassemble and returning plugin structure - for RAsm plugin
You can combine everything in one file and load it using -i option:
r2 -I mycpu.py some_file.bin
Or you can load it from the r2 shell: #!python mycpu.py
See also:
Implementing new format plugin in Python
Note - in the following examples there are missing functions of the actual decoding for the sake of readability!
For this you need to do this: 1. import r2lang 2. Make a function with subfunctions:
load
load_bytes
destroy
check_bytes
baddr
entries
sections
imports
relocs
binsym
info
and returning plugin structure - for RAsm plugin
def le_format(a):
def load(binf):
return [0]
def check_bytes(buf):
try:
if buf[0] == 77 and buf[1] == 90:
lx_off, = struct.unpack("<I", buf[0x3c:0x40])
if buf[lx_off] == 76 and buf[lx_off+1] == 88:
return [1]
return [0]
except:
return [0]
and so on. Please be sure of the parameters for each function and format of returns. Note, that functions entries, sections, imports, relocs returns a list of special formed dictionaries - each with a different type. Other functions return just a list of numerical values, even if single element one. There is a special function, which returns information about the file - info:
