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Assembly - Help with converting ASM instructions into machine code

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Old June 1st, 2008, 12:38 PM
Swerve1000 Swerve1000 is offline
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Assembly - Help with converting ASM instructions into machine code
Hi,

I am trying to convert the following line of code into machine code, but am stuck with one part.

The original instruction is:-

Quote:
MOVE.L #$D3A5, D2


Starting with:-

Quote:
0000 0000 0000 0000


I added the MOVE part, leaving:-

Quote:
0000 0000 0000 0000


I then added the .L, leaving:-

Quote:
0010 0000 0000 0000


Then I added the destination address (D2):-

Quote:
0010 0100 0000 0000


But now I am stuck, I have the answer which is:-

Quote:
0010 0100 0011 1100


My problem is that I don't see how the remaining L#$D3A5 fits into the answer. I understand that I am moving the data it'self in Hex format, but unfortunately this isn't bridging my gap in knowledge.

Thanks for any help!

Swerve.

P.S.

I have done an easier question shown below if that helps in any way.

Again, thanks!
Quote:

Original instruction :-

Quote:
MOVE.L D3, D1


So starting from :-
Quote:
0000 0000 0000 0000


I added the MOVE command:-

Quote:
0000 0000 0000 0000


Then added the .L :-

Quote:
0010 0000 0000 0000


Then added the source address ( D3):-
Quote:
0010 0000 0000 0011


Then added the destination address:-
Quote:
0010 0010 0000 0011


Which is the final answer.
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Old June 1st, 2008, 05:09 PM
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Schol-R-LEA Schol-R-LEA is offline
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To begin with, can you tell us what processor this is for, and what assembler syntax it is matching? I'm assuming it is MC68K, but I'm not certain.
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Old August 15th, 2008, 05:42 PM
xEchox xEchox is offline
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I assume x86 so the best way is to run some code through an assembler and look at that, you can modify the assembler to assemble anything, including invalid code.

-Echo
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