University of California Riverside
Department of Computer Science -- Embedded Systems
Instruction Set Simulator
Files:
simm.cc
simm.h
Makefile
Readme.txt
fib.txt
Instructions:
Download all files and run make using the provided Makefile.
Run by typing at the command line: simm < input file >
Notes:
The < input file > should be a text file containing the binary representations of the Instruction Set and their arguments. Example:
Assume Rn = 1 and direct = 1,
MOV Rn, direct ==> 0000000100000001
Each instruction must be in a separate line.
The first eight characters represent the first byte -> MOV Rn
The second eight characters represent the second byte -> direct
* Note: For JZ instruction, the jump can be forward and backward, which means that the "relative" address can be positive for a forward jump and negative for a backward jump. The way the instruction handles negative values is using twos complement of the desired number.
For example :
To jump forward 10 instructions ( PC = PC + 10 ) then the "relative" address will be "00001010"
To jump backward 10 instructions ( PC = PC + (- 10 )) then the "relative" address will be "11110110"
A test file ( fib.txt ) is provided to demonstrate how the simulator works. The test file calculates the fibonacci number for 10.
The Instruction Code Simulator will work for the following set of Instructions:
MOV Rn, direct => 0000
MOV direct, Rn => 0001
MOV @Rn, Rm => 0010
MOV Rn, #immed => 0011
ADD Rn, Rm => 0100
SUB Rn, Rm => 0101
JZ Rn, relative => 0110
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