Artemis Instruction Set Architecture (AISA)
A document outlying the instruction set architecture for Artemis
add.u
Unsigned Addition
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra + Rb]
The addu command takes 2 16-bit source registers Ra, Rb and adds them before storing them into a 16-bit destination register Rd.
add.s
Signed Addition
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 1 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra + Rb]
The adds command takes 2 16-bit source registers Ra, Rb containing signed values and adds them before storing them into a 16-bit destination register Rd.
sub.u
Unsigned Subtraction
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 1 | 0 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra - Rb]
The subu command takes 2 16-bit source registers Ra, Rb and subtracts them before storing them into a 16-bit destination register Rd.
sub.s
Signed Subtraction
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 1 | 1 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra - Rb]
The subs command takes 2 16-bit source registers Ra, Rb containing signed values and subtracts them before storing them into a 16-bit destination register Rd.
or
Bitwise OR operation
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 1 | 0 | X | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra | Rb]
The or command takes 2 16-bit source registers Ra, Rb and does a bitwise or before storing them into a 16-bit destination register Rd.
and
Bitwise AND operation
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 1 | 1 | X | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra & Rb]
The and command takes 2 16-bit source registers Ra, Rb and does a bitwise and before storing them into a 16-bit destination register Rd.
xor
Bitwise XOR operation
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 0 | 0 | X | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: [Rd = Ra ^ Rb]
The xor command takes 2 16-bit source registers Ra, Rb and does a bitwise xor before storing them into a 16-bit destination register Rd.
not
Bitwise NOT operation
Instruction form: RRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 0 | 1 | X | Rd | Rd | Rd | Ra | Ra | Ra | X | X | X | X | X |
Instruction function: [Rd = !Ra]
The not command takes 1 16-bit source register, Ra and does a bitwise not before storing it into a 16-bit destination register Rd.
read
Read Memory
Instruction form: RRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 1 | 0 | X | Rd | Rd | Rd | Ra | Ra | Ra | X | X | X | X | X |
Instruction function: Rd = Mem[Ra]
The read command takes 1 16-bit source register, Ra and reads from the corresponding memory address before storing it into a 16-bit destination register Rd.
write
Write Memory
Instruction form: RR
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 1 | 1 | X | X | X | X | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: Mem[Ra] = Rb
The write command takes 2 16-bit source registers Ra,Rb and writes the value of Rb into memory address Ra.
ldr.h
Load Register (High)
Instruction form: RdImm
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 | Rd | Rd | Rd | Imm | Imm | Imm | Imm | Imm | Imm | Imm | Imm |
Instruction function: Rd = Imm
The ldr.h command takes an 8-bit immediate value, Ra and stores it into the high 8-bits of a 16-bit destination register Rd.
ldr.l
Load Register (Low)
Instruction form: RdImm
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 0 | Rd | Rd | Rd | Imm | Imm | Imm | Imm | Imm | Imm | Imm | Imm |
Instruction function: Rd = Imm
The ldr.h command takes an 8-bit immediate value, Ra and stores it into the low 8-bits of a 16-bit destination register Rd.
cmp.u
Unsigned Compare
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 0 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: Rd = cmp(Ra, Rb)
The cmp.u command takes 2 16-bit source registers Ra,Rb and conducts various unsigned compare operations on them before storing the result into the destination register Rd.
cmp.s
Signed Compare
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 1 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: Rd = cmp(Ra, Rb)
The cmp.s command takes 2 16-bit source registers Ra,Rb and conducts various signed compare operations on them before storing the result into the destination register Rd.
shftl
Shift Left
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 1 | 0 | 0 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: Rd = Ra << Rb
The shftl command takes 2 16-bit source registers Ra,Rb and shifts Ra by Rb to the left before storing the result into the destination register Rd.
shftr
Shift Right
Instruction form: RRRd
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 1 | 1 | 0 | Rd | Rd | Rd | Ra | Ra | Ra | Rb | Rb | Rb | X | X |
Instruction function: Rd = Ra >> Rb
The shftr command takes 2 16-bit source registers Ra,Rb and shifts Ra by Rb to the right before storing the result into the destination register Rd.
jmp.i
Jump (Immediate)
Instruction form: Imm
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 0 | 0 | X | X | X | Imm | Imm | Imm | Imm | Imm | Imm | Imm | Imm |
Instruction function: PC = Imm The jmp.i command takes a 8-bit immediate value and sets the current program counter to that address.
jmp.r
Jump (Register)
Instruction form: R
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 0 | 1 | X | X | X | Ra | Ra | Ra | X | X | X | X | X |
Instruction function: PC = Ra The jmp.r command takes a 16-bit source register, Ra and sets the current program counter to that address.