How to get Python to use Assembly

问题

I am a beginner in assembly, but a master in Python. I have just recently started to learn x86_64 NASM for windows, and I wish to combine the power of assembly, and the flexibility of Python. I have looked all over, and I have not found a way to use a NASM assembly procedure from within Python. By this I do not mean in-line assembly. I wish to write an assembly program, compile it, and then somehow extract the procedure to use in my Python program. Can someone illustrate a simple example of how to do this, as I am completely lost.

回答1:

You could create a C extension wrapper for the functions implemented in assembly and link it to the OBJ file created by nasm.

A dummy example (for 32 bit Python 2; not tested):

myfunc.asm:

;http://www.nasm.us/doc/nasmdoc9.html
global  _myfunc 
section .text
_myfunc: 
    push    ebp 
    mov     ebp,esp 
    sub     esp,0x40        ; 64 bytes of local stack space 
    mov     ebx,[ebp+8]     ; first parameter to function 
    ; some more code 
    leave
    ret

myext.c:

#include <Python.h>

void myfunc(void);

static PyObject*
py_myfunc(PyObject* self, PyObject* args)
{
    if (!PyArg_ParseTuple(args, ""))
        return NULL;
    myfunc();
    Py_RETURN_NONE;
}

static PyMethodDef MyMethods[] =
{
    {"myfunc", py_myfunc, METH_VARARGS, NULL},
    {NULL, NULL, 0, NULL}
};

PyMODINIT_FUNC initmyext(void)
{
    (void) Py_InitModule("myext", MyMethods);
}

setup.py:

from distutils.core import setup, Extension
setup(name='myext', ext_modules=[
    Extension('myext', ['myext.c'], extra_objects=['myfunc.obj'])])

Build and run:

nasm -fwin32 myfunc.asm

python setup.py build_ext --inplace

python -c"import myext;myext.myfunc()"

回答2:

You can also embed assembly directly inside your Python program:

https://github.com/Maratyszcza/PeachPy
https://github.com//pycca/pycca
http://codeflow.org/entries/2009/jul/31/pyasm-python-x86-assembler/
https://github.com/AmihaiN/pyAsm

These work by compiling the assembly and loading it into executable memory at runtime. The first three projects implement x86 assemblers in Python, whereas the last calls out to an external compiler.

回答3:

Not sure about the "power" of assembly, really.

You can start here: https://docs.python.org/2/extending/extending.html

It's about extending python with compiled code, written in C or C++, but the principle should be the same (C is really just a portable macro-assembler).

来源：https://stackoverflow.com/questions/24462681/how-to-get-python-to-use-assembly

标签

python

windows

assembly

64-bit