Take-Home Preparation for the
CST222 Final Exam

ARC instructions

Write ARC assembly language instructions that will cause the following sequence of events to occur:

Set the lowest-numbered programmable register to contain ASCII string "NoTe".
[Note that the N and the T are UPPER-CASE, but the vowels are lower-case.]
Store the value into memory at location 0x800.
Now, set the same register to contain a string of four blanks.
Add the value 0x10101 to the value in memory at location 0x800.
Fetch the (modified) value at memory location 0x800 into the highest-numbered programmable register.
Perform an exclusive OR between these two registers, with the result going into register 7 (seven), and then store this result into memory location 0x400.

NOTE:

Contents of the memory and the registers are unknown at the start of this sequence.
Use only these three programmable registers.
Some of these steps may require more than one instruction
Avoid adding unnecessary instructions.
write the instructions in ARC assembly language, and also in hexadecimal if you can.

ALSO:

Add a label for each "task" letter (see above).
(This will help you keep track of which is which.)
For each instruction, add a comment describing what is changed (the register number or the memory location), and exactly what value (in hex) is stored into it.

EXAMPLE:

!(This is an example of the STYLE to be used; the instructions are incorrect.)

    A:
        sethi    66666666,  %r0    ! register r32 is set to 0x12345678
        mov      ax, ds            ! 0x9999 is stored in [0x444]
    B:  ld       %sp, %r3          ! 0x8888 is stored in register 3
    C:
        ...

TAKE-HOME PREPARATION FOR THE FINAL EXAM

Prior to the final exam (in class, on Tuesday 5/19), be sure to UPLOAD this code to your folder at http://suffolk.li/ with the file name "final-xyz.asm" (where "xyz" are YOUR initials!)

For the in-class final, you will be asked to modify these instructions, and re-upload the result.
There will also be further questions about how the processor actually decodes and executes these instructions, using the "microarchitecture" (as described in chapter 5 of the textbook), as well as some questions on other topics.

You MAY use the ARC simulator for this take-home preparation.
(No simulator on Tuesday, but the in-class exam will be open-book & open-notes.)