PyARM-Assembler

Assembler for ARM assembly language.

An assembler is just a simple program that is supposed to convert assembly code to machine code(binary).
A linker may be further implemented for execution. Given an ARM7 assembly code to our assembler, we want it to spit binary.
eg:

MOV R3, R9   # assembly
1110 0001 1010 0000 0011 0000 0000 1001  # binary

An assembler has two passes, coz it skips certain lines in first pass.
Read input line, parse the opcode, check for operands, addressing modes etc,
get all 8 bits and write them to a object text file.
This assembler, however, is an one pass assembler.

How to run ?

python assembler.py -f fileName.s 

For debugging, set the debug variable in source equal to 1.

Some material :

• ARM Assembly: ARM assembly doc.
• Assembler Steps
• see page 32
• Working
• A C based assembly parser
• Standard Assembly book
• ARM7 Instruction Set
• A good resource

Future Work

• Make a 8051 version of this, preferably using Chapel Language.