Re: assembler design

macluvitch@hotmail.com (macluvitch) wrote
> Well I'm trying to write a simple assembler with intel syntax.
> I've got a look at gasm source (the gnu assembler) to get an idea on
> how it's implemented or especially how it translates mnemonics into
> opcodes, it's so complicated the way he does .
> it uses a struct table representing the mnemonic token, it's
> equivalent opcode,
> how many arguments...
>
> for example these following statements haven't the same opcodes
> mov ah, mem
> mov mem, h
>
> so we have to say invent a way to handle all different possible ways
>
> please can anybody clear things up for me


Hi ,
    I feel taking a look at SoftWire Dynamic Assembler Project (
http://softwire.sourceforge.net/ ) will give u a better idea of how to
translate the mnemonic sequence into code. The Source code is readable
( as it is written in C++ as opposed to C ). I have used the source
code there to study about instruction encoding for pentium processor.
( And has written a
dynamic compiler for a high level basic like language thanks to that )


                                                                                                    Praseed Pai
                                                                                                    praseedpai@yahoo.com

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