Description
This package, for the Atom-Editor, contains a grammar for the assembly language of the Visual-X-TOY-CPU. The grammar is used to provide a syntax-highlighting, in order to improve the overview and correctness, while programming in assembly language, for Visual-X-TOY.
Supported TOY instructions
| # | Assembly | Register-Transfer | C-Language |
|---|---|---|---|
| 0 | HLT | halt | |
| 1 | ADD Rd Rs Rt | Rd ← Rs + Rt | Rd = Rs + Rt |
| 2 | SUB Rd Rs Rt | Rd ← Rs - Rt | Rd = Rs - Rt |
| 3 | AND Rd Rs Rt | Rd ← Rs & Rt | Rd = Rs & Rt |
| 4 | XOR Rd Rs Rt | Rd ← Rs ^ Rt | Rd = Rs ^ Rt |
| 5 | SHL Rd Rs Rt | Rd ← Rs << Rt | Rd = Rs << Rt |
| 6 | SHR Rd Rs Rt | Rd ← Rs >> Rt | Rd = Rs >> Rt |
| 7 | LDA Rd imm | Rd ← imm | Rd = imm |
| 8 | LD Rd addr | Rd ← mem[addr] | Rd = a |
| 9 | ST Rd addr | mem[addr] ← Rd | a = Rd |
| A | LDI Rd Rt | Rd ← mem[Rt] | Rd = *Rt |
| B | STI Rd Rt | mem[Rt] ← Rd | *Rt = Rd |
| C | BZ Rd addr | if(RD==0) IP ← addr | if(RD==0) goto addr |
| D | BP Rd addr | if(RD>0) IP ← addr | if(RD>0) goto addr |
| E | JR Rd | IP ← addr | returning from a function |
| F | JL Rd addr | Rd ← IP; IP ← Rd | calling a function |
Modified HLT: Extended instruction set
| #### | Assembly | Explanation |
|---|---|---|
| 0000 | HLT | halt |
| 010t | PUSH Rt | Increase stack by 1 and copy value from given register to stack. |
| 020t | POP Rt | Copy value from Stack to given address (Rt) and decrease Stack by 1. |
| 03aa | CALL addr | Increase stack by 1, safe return address on stack and call the Subroutine of given address label. |
| 040t | RET | Return to callee-function, by looking up the return address from the Stack. |
