Finish the Java implementation of a functional simulator for a simple instruction set architecture.
The instruction set architecture: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Our architecture has:
- 4 8-bit registers R0, R1, R2, and R3 - an 8-bit PC - an 8-bit result register
All registers are initialized to 0.
Instructions are either 1 or 2 byte long. Here are the defined instructions:
binary encoding instruction description
00000000 halt stop the processor
000011dd jle Rdd branch to the address in Rdd if the value in the result register is less than or equal to zero
000110dd outch Rdd print the character whose ASCII code is in Rdd
000111dd show Rdd print the value in Rdd as both hexadecimal and decimal integer
001000dd vvvvvvvv movi vvvvvvvv,Rdd move the 8 bit immediate value vvvvvvvv to Rdd
1000ssdd add Rss,Rdd add the contents of Rss and Rdd and store the result in Rdd
1011ssdd cmp Rss,Rdd subtract the contents of Rss from Rdd and store the result in the result register
The simulator terminates if it encounters an invalid instruction
To compile: ~~~~~~~~~~~
make
To run: ~~~~~~~
make test
File: ~~~~~
src/cs429/Main.java The main program (don't change it) test.ok Expected output (don't change it) src/cs429/Simulator.java The simulator test.out The output produced by running "make test"
