thingamajig/calculator.asm

1025 lines
17 KiB
NASM
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org 0
cleq r0, r0, readline
load r0, linelen+0
load r1, linelen+1
cleq r0, r0, pushWord
cleq r0, r0, stDup
cleq r0, r0, stPrinthex
xor r0, r0
xor r1, r1
cleq r0, r0, pushWord
printloop:
cleq r0, r0, stOver
cleq r0, r0, stOver
cleq r0, r0, stSwap
cleq r0, r0, stGtEq
brneq r0, r1, printend
cleq r0, r0, stDup
load r0, linebufStart+0
load r1, linebufStart+1
cleq r0, r0, pushWord
cleq r0, r0, stAdd
cleq r0, r0, stLoadByte
cleq r0, r0, stEmit
cleq r0, r0, stInc
breq r0, r0, printloop
printend:
cleq r0, r0, newline
halt
debug:
store debugr0, r0
store debugr1, r1
store debugr2, r2
store debugr3, r3
debugRegs:
load r0, debugr0
cleq r0, r0, writehexByte
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load r0, #20
store ffff, r0
load r0, debugr1
cleq r0, r0, writehexByte
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load r0, #20
store ffff, r0
load r0, debugr2
cleq r0, r0, writehexByte
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load r0, #20
store ffff, r0
load r0, debugr3
cleq r0, r0, writehexByte
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load r0, #20
store ffff, r0
debugTmpWords:
load r0, tmpWordHigh
load r1, tmpWordLow
cleq r0, r0, writeHexWord
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load r0, #20
store ffff, r0
load r0, tmpWord2High
load r1, tmpWord2Low
cleq r0, r0, writeHexWord
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load r0, #7c
store ffff, r0
load r0, SPStart+0
load r1, SPStart+1
store debugPtr+0, r0
store debugPtr+1, r1
debugLoop:
load r0, debugPtr+0
load r1, debugPtr+1
load r2, SP+0
load r3, SP+1
brneq r0, r2, debugDumpword
breq r1, r3, debugEnd
debugDumpword:
load r0, debugPtr+0
load r1, debugPtr+1
store loadByteHigh, r0
store loadByteLow, r1
cleq r0, r0, loadByte
cleq r0, r0, writehexByte
load r0, debugPtr+0
load r1, debugPtr+1
cleq r0, r0, incWord
store debugPtr+0, r0
store debugPtr+1, r1
load r0, debugPtr+0
load r1, debugPtr+1
store loadByteHigh, r0
store loadByteLow, r1
cleq r0, r0, loadByte
cleq r0, r0, writehexByte
load r0, debugPtr+0
load r1, debugPtr+1
cleq r0, r0, incWord
store debugPtr+0, r0
store debugPtr+1, r1
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load r0, #20
store ffff, r0
breq r0, r0, debugLoop
debugEnd:
cleq r0, r0, newline
load r0, debugr0
load r1, debugr1
load r2, debugr2
load r3, debugr3
ret
debugPtr: addr debugPtr
debugr0: data 0
debugr1: data 0
debugr2: data 0
debugr3: data 0
readline:
; Current index starts at 0
xor r0, r0
xor r1, r1
cleq r0, r0, pushWord
readlineLoop:
; Read a byte of input
cleq r0, r0, stKey
; Is it enter?
cleq r0, r0, peekWord
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load r0, #0d
breq r0, r1, readlineEnter
; Is it backspace?
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load r0, #08
breq r0, r1, readlineBackspace
; Is the buffer full?
cleq r0, r0, stOver
load r0, linebufSize+0
load r1, linebufSize+1
cleq r0, r0, pushWord
cleq r0, r0, stGtEq
brneq r0, r1, readlineBufFull
; Calculate address
cleq r0, r0, stOver
load r0, linebufStart+0
load r1, linebufStart+1
cleq r0, r0, pushWord
cleq r0, r0, stAdd
; Store the read byte
cleq r0, r0, stStoreByte
; Increase index
cleq r0, r0, stInc
breq r0, r0, readlineLoop
readlineEnter:
; Remove the CR byte off the stack, as it's not needed
cleq r0, r0, popWord
cleq r0, r0, popWord
store linelen+0, r0
store linelen+1, r1
breq r0, r0, newline
readlineBackspace:
; Remove the BS byte off the stack
cleq r0, r0, popWord
; Are we at the beginning of the line?
cleq r0, r0, stDup
xor r0, r0
xor r1, r1
cleq r0, r0, pushWord
cleq r0, r0, stSwap
cleq r0, r0, stGtEq
brneq r0, r1, readlineLoop
; Decrease the index and erase the echoed character
; TODO: utf-8
cleq r0, r0, stDec
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load r3, #20
store ffff, r3
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load r3, #08
store ffff, r3
breq r0, r0, readlineLoop
readlineBufFull:
; Drop the input byte and erase the echoed character
; TODO: utf-8
cleq r0, r0, popWord
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load r3, #08
store ffff, r3
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load r3, #20
store ffff, r3
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load r3, #08
store ffff, r3
breq r0, r0, readlineLoop
; ==================================================================
; Stack-based functions
; ==================================================================
; ------------------------------------------------------------------
; Arithmetic
; ------------------------------------------------------------------
; a b -- a+b
stAdd:
cleq r0, r0, popWord
cleq r0, r0, tmpStoreWord01
cleq r0, r0, popWord
cleq r0, r0, tmpLoadWord23
cleq r0, r0, addWord
breq r0, r0, pushWord
; a b -- a-b
stSub:
cleq r0, r0, popWord
cleq r0, r0, tmpStoreWord01
cleq r0, r0, popWord
cleq r0, r0, tmpLoadWord23
cleq r0, r0, subWord
breq r0, r0, pushWord
; a -- a+1
stInc:
cleq r0, r0, popWord
cleq r0, r0, incWord
breq r0, r0, pushWord
; a -- a-1
stDec:
cleq r0, r0, popWord
cleq r0, r0, decWord
breq r0, r0, pushWord
; a b --
; if a >= b then r0:r1 = 0001
; else r0:r1 = 0000
stGtEq:
cleq r0, r0, popWord
cleq r0, r0, tmpStoreWord01
cleq r0, r0, popWord
cleq r0, r0, tmpLoadWord23
cleq r0, r0, subWord
xor r0, r0
xor r1, r1
or r1, r2
ret
; ------------------------------------------------------------------
; I/O
; ------------------------------------------------------------------
; n -- n
stPrinthex:
cleq r0, r0, popWord
cleq r0, r0, writehexWord
breq r0, r0, newline
; -- c
stKey:
xor r0, r0
load r1, ffff
breq r0, r0, pushWord
; c --
stEmit:
cleq r0, r0, popWord
store ffff, r1
ret
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; ------------------------------------------------------------------
; Stack manipulation
; ------------------------------------------------------------------
; a - a a
stDup:
cleq r0, r0, peekWord
breq r0, r0, pushWord
; a b -- a b a
stOver:
cleq r0, r0, popWord
cleq r0, r0, tmpStoreWord01
cleq r0, r0, peekWord
cleq r0, r0, tmp2StoreWord01
cleq r0, r0, tmpLoadWord01
cleq r0, r0, pushWord
cleq r0, r0, tmp2LoadWord01
breq r0, r0, pushWord
; a b -- b a
stSwap:
cleq r0, r0, popWord
cleq r0, r0, tmpStoreWord01
cleq r0, r0, popWord
cleq r0, r0, tmp2StoreWord01
cleq r0, r0, tmpLoadWord01
cleq r0, r0, pushWord
cleq r0, r0, tmp2LoadWord01
breq r0, r0, pushWord
; ------------------------------------------------------------------
; Memory
; ------------------------------------------------------------------
; b ptr --
stStoreByte:
cleq r0, r0, popWord
store storeByteHigh, r0
store storeByteLow, r1
cleq r0, r0, popWord
xor r0, r0
or r0, r1
breq r0, r0, storeByte
; ptr -- b
stLoadByte:
cleq r0, r0, popWord
store loadByteHigh, r0
store loadByteLow, r1
cleq r0, r0, loadByte
xor r1, r1
or r1, r0
xor r0, r0
breq r0, r0, pushWord
; n ptr --
stStoreWord:
cleq r0, r0, popWord
cleq r0, r0, tmpStoreWord01
store storeByteHigh, r0
store storeByteLow, r1
cleq r0, r0, peekWord
cleq r0, r0, storeByte
cleq r0, r0, tmpLoadWord01
cleq r0, r0, incWord
store storeByteHigh, r0
store storeByteLow, r1
cleq r0, r0, popWord
xor r0, r0
or r0, r1
breq r0, r0, storeByte
; ptr -- n
stLoadWord:
cleq r0, r0, peekWord
store loadByteHigh, r0
store loadByteLow, r1
cleq r0, r0, loadByte
cleq r0, r0, tmpStoreWord01
cleq r0, r0, popWord
cleq r0, r0, incWord
store loadByteHigh, r0
store loadByteLow, r1
cleq r0, r0, loadByte
xor r2, r2
or r2, r0
cleq r0, r0, tmpLoadWord01
xor r1, r1
or r1, r2
breq r0, r0, pushWord
; ==================================================================
; Low-level functions
; ==================================================================
; ------------------------------------------------------------------
; Memory
; ------------------------------------------------------------------
tmpWordHigh: data 0
tmpWordLow: data 0
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tmpWord2High: data 0
tmpWord2Low: data 0
; in:
; r0:r1 = word
tmpStoreWord01:
store tmpWordHigh, r0
store tmpWordLow, r1
ret
; out:
; r0:r1 = word
tmpLoadWord01:
load r0, tmpWordHigh
load r1, tmpWordLow
ret
; out:
; r2:r3 = word
tmpLoadWord23:
load r2, tmpWordHigh
load r3, tmpWordLow
ret
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; in:
; r0:r1 = word
tmp2StoreWord01:
store tmpWord2High, r0
store tmpWord2Low, r1
ret
; out:
; r0:r1 = word
tmp2LoadWord01:
load r0, tmpWord2High
load r1, tmpWord2Low
ret
; out:
; r0:r1 = word
; clobbers:
; r2, r3
peekWord:
cleq r0, r0, popWord
store peekWordHigh, r0
store peekWordLow, r1
; Return SP back to where it was
load r0, SP+0
load r1, SP+1
xor r2, r2
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load r3, #02
cleq r0, r0, addWord
store SP+0, r0
store SP+1, r1
load r0, peekWordHigh
load r1, peekWordLow
ret
peekWordHigh: data 0
peekWordLow: data 0
; in:
; r0:r1 = word
; clobbers:
; r0, r1, r2, r3
pushWord:
store pushWordLow, r1
cleq r0, r0, pushByte
load r0, pushWordLow
breq r0, r0, pushByte
pushWordLow: data 0
; out:
; r0:r1
; clobbers:
; r2, r3
popWord:
cleq r0, r0, popByte
store popWordLow, r0
cleq r0, r0, popByte
load r1, popWordLow
ret
popWordLow: data 0
; in:
; r0 = byte
; clobbers:
; r0, r1, r2, r3
pushByte:
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load r2, SP+0
store storeByteHigh, r2
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load r3, SP+1
store storeByteLow, r3
cleq r0, r0, storeByte
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load r0, SP+0
load r1, SP+1
cleq r0, r0, incWord
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store SP+0, r0
store SP+1, r1
ret
; out:
; r0 = byte
; clobbers:
; r1, r2, r3
popByte:
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load r0, SP+0
load r1, SP+1
load r2, SPStart+0
load r3, SPStart+1
brneq r0, r2, popByteNoUnderflow
breq r1, r3, error
popByteNoUnderflow:
cleq r0, r0, decWord
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store SP+0, r0
store SP+1, r1
store loadByteHigh, r0
store loadByteLow, r1
breq r0, r0, loadByte
; in:
; storeByteHigh:storeByteLow = address
; r0 = byte
storeByte:
data b0 ; store addr, r0
storeByteHigh: data 0
storeByteLow: data 0
ret
; in:
; loadByteHigh:loadByteLow = address
; out:
; r0 = byte
loadByte:
data a0 ; load r0, addr
loadByteHigh: data 0
loadByteLow: data 0
ret
; ------------------------------------------------------------------
; Arithmetic
; ------------------------------------------------------------------
; in:
; r0:r1 = first addend
; r2:r3 = second addend
; out:
; r0:r1 = result
; r2 = carryout
; clobbers:
; r3
addWord:
store addWordFirstHigh, r0
store addWordSecondHigh, r2
; Add low bytes
xor r0, r0
or r0, r3
cleq r0, r0, addByte
store addWordResultLow, r0
; Add high bytes and carry (in r1)
load r0, addWordFirstHigh
load r2, addWordSecondHigh
cleq r0, r0, addByte3
; Move carryout to r2
xor r2, r2
or r2, r1
load r1, addWordResultLow
ret
addWordFirstHigh: data 0
addWordSecondHigh: data 0
addWordResultLow: data 0
; in:
; r0:r1 = minuend
; r2:r3 = subtrahend
; out:
; r0:r1 = result
; r2 = carryout
; clobbers:
; r3
subWord:
store subWordMinuendHigh, r0
store subWordSubtrahendHigh, r2
; Subtract low bytes
; a - b = a + (-b) = a + ~b + 1
xor r0, r0
or r0, r3
nand r0, r0
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load r2, #01
cleq r0, r0, addByte3
store subWordResultLow, r0
; Subtract high bytes with carry-in in r1
load r0, subWordMinuendHigh
load r2, subWordSubtrahendHigh
nand r2, r2
cleq r0, r0, addByte3
; Move carryout to r2
xor r2, r2
or r2, r1
load r1, subWordResultLow
ret
subWordMinuendHigh: data 0
subWordSubtrahendHigh: data 0
subWordResultLow: data 0
; in/out:
; r0:r1 = word
; clobbers:
; r2, r3
incWord:
store incWordHigh, r0
; Add 1 to low byte
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load r0, #01
cleq r0, r0, addByte
store incWordLow, r0
; Add carry to high byte
load r0, incWordHigh
cleq r0, r0, addByte
load r1, incWordLow
ret
incWordHigh: data 0
incWordLow: data 0
; in/out:
; r0:r1 = word
; clobbers:
; r2, r3
decWord:
store decWordHigh, r0
; Add ff to low byte
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load r0, #ff
cleq r0, r0, addByte
store decWordLow, r0
; Add ff and carry to high byte
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load r0, #ff
load r2, decWordHigh
cleq r0, r0, addByte3
load r1, decWordLow
ret
decWordHigh: data 0
decWordLow: data 0
; in:
; r0 = first addend
; r1 = second addend
; r2 = third addend
; out:
; r0 = result
; r1 = carryout
; clobbers:
; r2, r3
addByte3:
store addByte3ThirdAddend, r2
cleq r0, r0, addByte
store addByte3Carryout, r1
load r1, addByte3ThirdAddend
cleq r0, r0, addByte
load r3, addByte3Carryout
or r1, r3
ret
addByte3ThirdAddend: data 0
addByte3Carryout: data 0
; in:
; r0 = first addend
; r1 = second addend
; out:
; r0 = result
; r1 = carryout
; clobbers:
; r2, r3
addByte:
; Initiliaze carryout to 0
xor r2, r2
addByteLoop:
; Copy second addend to r3
xor r3, r3
or r3, r1
; Calculate carries in r3
and r3, r0
or r2, r3 ; Accumulate carry into carryout
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shl r3, 1
; Calculate sums in r0
xor r0, r1
; Copy carries into second addend
xor r1, r1
or r1, r3
; Loop until second addend is 0
xor r3, r3
brneq r1, r3, addByteLoop
; Shift carryout, as we want carry from highest place = 1
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shr r2, 4
shr r2, 3
; Move carryout to r1
; (We know r1 is already 0 since it's the loop condition)
or r1, r2
ret
; ------------------------------------------------------------------
; Hex conversion routines
; ------------------------------------------------------------------
; in:
; r0 = number in range [0, 0xf]
; out:
; r0 = ascii character corresponding to input
; clobbers:
; r3
nybble2hex:
xor r3, r3
breq r0, r3, nybble2hex0
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load r3, #01
breq r0, r3, nybble2hex1
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load r3, #02
breq r0, r3, nybble2hex2
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load r3, #03
breq r0, r3, nybble2hex3
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load r3, #04
breq r0, r3, nybble2hex4
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load r3, #05
breq r0, r3, nybble2hex5
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load r3, #06
breq r0, r3, nybble2hex6
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load r3, #07
breq r0, r3, nybble2hex7
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load r3, #08
breq r0, r3, nybble2hex8
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load r3, #09
breq r0, r3, nybble2hex9
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load r3, #0a
breq r0, r3, nybble2hexa
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load r3, #0b
breq r0, r3, nybble2hexb
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load r3, #0c
breq r0, r3, nybble2hexc
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load r3, #0d
breq r0, r3, nybble2hexd
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load r3, #0e
breq r0, r3, nybble2hexe
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load r3, #0f
breq r0, r3, nybble2hexf
breq r0, r0, error
nybble2hex0:
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load r0, #30
ret
nybble2hex1:
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load r0, #31
ret
nybble2hex2:
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load r0, #32
ret
nybble2hex3:
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load r0, #33
ret
nybble2hex4:
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load r0, #34
ret
nybble2hex5:
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load r0, #35
ret
nybble2hex6:
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load r0, #36
ret
nybble2hex7:
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load r0, #37
ret
nybble2hex8:
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load r0, #38
ret
nybble2hex9:
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load r0, #39
ret
nybble2hexa:
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load r0, #61
ret
nybble2hexb:
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load r0, #62
ret
nybble2hexc:
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load r0, #63
ret
nybble2hexd:
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load r0, #64
ret
nybble2hexe:
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load r0, #65
ret
nybble2hexf:
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load r0, #66
ret
; in:
; r0 = ascii hex digit
; out:
; r0 = corresponding nybble
; clobbers:
; r3
hex2nybble:
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load r3, #30
breq r0, r3, hex2nybble0
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load r3, #31
breq r0, r3, hex2nybble1
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load r3, #32
breq r0, r3, hex2nybble2
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load r3, #33
breq r0, r3, hex2nybble3
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load r3, #34
breq r0, r3, hex2nybble4
2022-08-27 16:34:57 +00:00
load r3, #35
breq r0, r3, hex2nybble5
2022-08-27 16:34:57 +00:00
load r3, #36
breq r0, r3, hex2nybble6
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load r3, #37
breq r0, r3, hex2nybble7
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load r3, #38
breq r0, r3, hex2nybble8
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load r3, #39
breq r0, r3, hex2nybble9
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load r3, #61
breq r0, r3, hex2nybblea
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load r3, #62
breq r0, r3, hex2nybbleb
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load r3, #63
breq r0, r3, hex2nybblec
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load r3, #64
breq r0, r3, hex2nybbled
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load r3, #65
breq r0, r3, hex2nybblee
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load r3, #66
breq r0, r3, hex2nybblef
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load r3, #41
breq r0, r3, hex2nybblea
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load r3, #42
breq r0, r3, hex2nybbleb
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load r3, #43
breq r0, r3, hex2nybblec
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load r3, #44
breq r0, r3, hex2nybbled
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load r3, #45
breq r0, r3, hex2nybblee
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load r3, #46
breq r0, r3, hex2nybblef
breq r0, r0, error
hex2nybble0:
xor r0, r0
ret
hex2nybble1:
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load r0, #01
ret
hex2nybble2:
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load r0, #02
ret
hex2nybble3:
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load r0, #03
ret
hex2nybble4:
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load r0, #04
ret
hex2nybble5:
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load r0, #05
ret
hex2nybble6:
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load r0, #06
ret
hex2nybble7:
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load r0, #07