User:Ben Russell
From Esolang
I forgot my password, yet again. GAH! I'm usually pretty good with passwords.
Contents |
[edit] Announcement
If you find some archaic license on any of these languages, disregard it. I don't care what you do with it anymore. I'd like to see it simply used as it should be. I am cleaning up all the licence crap now. --Ben Russell 05:31, 12 August 2008 (UTC)
[edit] Criminal convictions
- HighFive, the first, the worst.
- TheSquare, 2D multitasking language better suited for battle games.
- RETURN, just plain weird.
- MiniScript, something that's actually useful.
- An advanced SKI interpreter.
- A Brainfuck interpreter.
- A Befunge-98 interpreter.
[edit] A
I'm also currently working on a processor architecture, called "A", which I will release as public domain. It's what I will categorise as an "AISC" - Accumulator-based Instruction Set Computer. The objective is to have really really small code. Public domain; I've had problems in the past with people squawking at me.
There are 3 main registers: A,B,C. To load values in, a "D" register is used, which fetches the value after it. There are two others which can't be accessed normally: "PC", program counter, and "SP", stack pointer.
It's a little-endian machine. It has to be 8-bit little-endian, that's standard. Big-endian sucks. PDP-endian sucks even more. 16-bit little-endian is inappropriate for 8-bit opcodes. 4-bit LE is just plain weird. It's 8-bit little endian only. Stack is decrementing.
The basic opcode is in the format iiiidtxx, where i is the instruction, d is the direction, t is the type, and x is the register. However, it doesn't follow this entirely, as you will find out soon. Exceptions will be shown as indented.
[edit] Registers
- 00 - A
- 01 - B
- 10 - C
- 11 - value after opcode
[edit] Instructions
000000xx - MOV A,x 000001xx - MOV A,[x] 000010xx - MOV x,A 000010xx - MOV [x],A 000100xx - XOR A,x 000101xx - XOR A,[x] 000110xx - XOR x,A 000110xx - XOR [x],A 001000xx - OR A,x 001001xx - OR A,[x] 001010xx - OR x,A 001010xx - OR [x],A 001100xx - AND A,x 001101xx - AND A,[x] 001110xx - AND x,A 001110xx - AND [x],A 010000xx - PUSH x 010001xx - SHL x 010010xx - POP x 010011xx - SHR x 010100xx - INC x 010101xx - INC [x] 010110xx - DEC x 010111xx - DEC [x] 0110xxyy - XCHG x,y 01100000 - DI 01100101 - EI 01101010 - [ unused opcode ] 0110xx11 - IN x,[next byte] 011011xx - OUT [next byte],x 01101111 - INT x 011100xx - MOV B,x 011101xx - MOV B,[x] 011110xx - MOV x,B 011111xx - MOV [x],B 100000xx - ADD A,x 100001xx - ADD A,[x] 100010xx - ADD x,A 100010xx - ADD [x],A 100100xx - ADC A,x 100101xx - ADC A,[x] 100110xx - ADC x,A 100110xx - ADC [x],A 101000xx - SUB A,x 101001xx - SUB A,[x] 101010xx - SUB x,A 101010xx - SUB [x],A 101100xx - SBC A,x 101101xx - SBC A,[x] 101110xx - SBC x,A 101110xx - SBC [x],A 110000xx - JMP x 11000100 - RET NZ 11000101 - RET Z 11000110 - RET NC 11000111 - RET C 11001100 - JMP [x] 110011xx - [ unused opcodes ] 110100xx - JNZ x 110101xx - JZ x 110110xx - JNC x 110111xx - JC x 111000xx - CMP A,x 111001xx - MOV SP,x 111010xx - CMP x,A 111011xx - MOV x,SP 111100xx - CALL x 11110100 - RET 11110101 - RETI 11110110 - SYSLD (read on for more info) 11110111 - HALT 111110xx - [ unused opcodes ]
Virtually anywhere there is "X", you can replace it with a data value, and put the data value at the end, e.g:
MOV A,0x12345678 03
When a CALL is issued, it pushes onto the stack in the order PC, B, C.
"A" is not preserved, and it can be used as a return code.
Now, WTF is SYSLD? Well, it's used for extensions. You set C to the SYSLD type, and B and A as any parameters.
The first two (0x00 to 0x01) are reserved for interrupts.
- 0x00: Load Interrupt Handler - B = 8-bit interrupt number, A = handler location. Returns nothing.
- 0x01: Read Interrupt Handler Location - B = 8-bit interrupt number. Returns handler location as A.
The rest you can define to your heart's content. I suggest putting some SIMD stuff in. Heck, you could even stick a GDT in there.
[edit] Compiler progress
Well, it can compile the MOV instruction completely.
