Creating an ARM Dissassembler Need help on MUL Instruction (ARM Assembly) -


i trying create disassembler arm want learn arm assembly language. have read stackoverflow thread best way it. 1 thing having trouble getting decode of multiply correctly.

here example of disassembled object file.

00008054 <_start>: ==============ommitted irrelevant instructions ====

8064:   e0010092    mul r1, r2, r0

from reference manual (http://www.nyx.net/~troddis/arm.html), multiply instruction should have value of "1001" in bits [4-7] inclusive. however, e0010092 in binary "11100010000000000001000000000010" have 0000 in bits 4-7.

is there obvious missing? using codesourcery's arm 2012.09-64 cross compiler...

how'd convert binary? hex 9 binary 1001.


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