fox32/encoding.md

46 lines
2.0 KiB
Markdown
Raw Normal View History

# Encoding
```
size instr . cond dest src <src> <dest>
xx xxxxxx 0 xxx xx xx <8,16,32 bits> <8,16,32 bits>
```
# Size table
If the instruction doesn't allow variable sizes or a size was not specified, set the size bits to Word (0b10)
| | |
| :--: | -------------- |
| 0b00 | byte (8 bits) |
| 0b01 | half (16 bits) |
| 0b10 | word (32 bits) |
# Instruction table
| 0x | -0 | -1 | -2 | -3 | -4 | -5 | -6 | -7 | -8 | -9 | -A | -B | -C | -D | -E | -F |
| :-: | ---- | ------------- | ------------- | ------------- | ------------- | ------------- | ------------- | -------------- | ---- | ----- | -------------- | --- | --- | --- | --- | --- |
| 0- | NOP | ADD[.8,16,32] | MUL[.8,16,32] | AND[.8,16,32] | SLA[.8,16,32] | SRA[.8,16,32] | BSE[.8,16,32] | CMP[.8,16,32] | JMP | RJMP | PUSH[.8,16,32] | IN | ISE | | | |
| 1- | HALT | INC[.8,16,32] | POW[.8,16,32] | OR[.8,16,32] | | SRL[.8,16,32] | BCL[.8,16,32] | MOV[.8,16,32] | CALL | RCALL | POP[.8,16,32] | OUT | ICL | | | |
| 2- | BRK | SUB[.8,16,32] | DIV[.8,16,32] | XOR[.8,16,32] | ROL[.8,16,32] | ROR[.8,16,32] | BTS[.8,16,32] | MOVZ[.8,16,32] | LOOP | RLOOP | RET | | | | | |
| 3- | | DEC[.8,16,32] | REM[.8,16,32] | NOT[.8,16,32] | | | | | | RTA | RETI | | | | | |
# Condition table
| | |
| :---: | -------- |
| 0b000 | (always) |
| 0b001 | IFZ |
| 0b010 | IFNZ |
| 0b011 | IFC |
| 0b100 | IFNC |
# Destination table
| | |
| :--: | ------------------- |
| 0b00 | register |
| 0b01 | register (pointer) |
| 0b10 | immediate (pointer) |
# Source table
| | |
| :--: | ------------------- |
| 0b00 | register |
| 0b01 | register (pointer) |
| 0b10 | immediate |
| 0b11 | immediate (pointer) |