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avra: refactor instruction tbl 

The instruction table is now beefier and has redundant data, but
this simplifies processing. This should simplify upcoming work.
This commit is contained in:
Virgil Dupras 2019-12-15 15:53:28 -05:00
parent aa8df95f7d
commit 62eb5589c3
1 changed files with 127 additions and 135 deletions
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262
apps/zasm/avr.asm
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@ -31,7 +31,7 @@ instrNames:
.equ I_BRBS 16
.db "BRBS", 0
.db "BRBC", 0
; Rd(5) + Rr(5) (from here, instrUpMasks1)
; Rd(5) + Rr(5) (from here, instrTbl8)
.equ I_ADC 18
.db "ADC", 0
.db "ADD", 0
@ -66,7 +66,7 @@ instrNames:
.db "IN", 0
.equ I_OUT 45
.db "OUT", 0
; no arg (from here, instrUpMasks2)
; no arg (from here, instrTbl16)
.equ I_BREAK 46
.db "BREAK", 0
.db "CLC", 0
@ -112,90 +112,95 @@ instrNames:
.db "XCH", 0
.db 0xff
; Instruction table
;
; A table row starts with the "argspecs+flags" byte, followed by two upcode
; bytes.
;
; The argspecs+flags byte is separated in two nibbles: Low nibble is a 4bit
; index (1-based, 0 means no arg) in the argSpecs table. High nibble is for
; flags. Meaning:
;
; (None for now)
; 8-bit constant masks associated with each instruction. In the same order as
; in instrNames
instrUpMasks1:
; In the same order as in instrNames
instrTbl:
; Rd(5) + Rd(5): XXXXXXrd ddddrrrr
.db 0b00011100 ; ADC
.db 0b00001100 ; ADD
.db 0b00100000 ; AND
.db 0b00100100 ; CLR
.db 0b00010100 ; CP
.db 0b00000100 ; CPC
.db 0b00010000 ; CPSE
.db 0b00100100 ; EOR
.db 0b00101100 ; MOV
.db 0b10011100 ; MUL
.db 0b00101000 ; OR
.db 0b00001000 ; SBC
.db 0b00011000 ; SUB
.db 0x02, 0b00011100, 0x00 ; ADC
.db 0x02, 0b00001100, 0x00 ; ADD
.db 0x02, 0b00100000, 0x00 ; AND
.db 0x02, 0b00100100, 0x00 ; CLR
.db 0x02, 0b00010100, 0x00 ; CP
.db 0x02, 0b00000100, 0x00 ; CPC
.db 0x02, 0b00010000, 0x00 ; CPSE
.db 0x02, 0b00100100, 0x00 ; EOR
.db 0x02, 0b00101100, 0x00 ; MOV
.db 0x02, 0b10011100, 0x00 ; MUL
.db 0x02, 0b00101000, 0x00 ; OR
.db 0x02, 0b00001000, 0x00 ; SBC
.db 0x02, 0b00011000, 0x00 ; SUB
; Rd(4) + K(8): XXXXKKKK ddddKKKK
.db 0b01110000 ; ANDI
.db 0b00110000 ; CPI
.db 0b11100000 ; LDI
.db 0b01100000 ; ORI
.db 0b01000000 ; SBCI
.db 0b01100000 ; SBR
.db 0b01010000 ; SUBI
.db 0x04, 0b01110000, 0x00 ; ANDI
.db 0x04, 0b00110000, 0x00 ; CPI
.db 0x04, 0b11100000, 0x00 ; LDI
.db 0x04, 0b01100000, 0x00 ; ORI
.db 0x04, 0b01000000, 0x00 ; SBCI
.db 0x04, 0b01100000, 0x00 ; SBR
.db 0x04, 0b01010000, 0x00 ; SUBI
; Rd(5) + bit: XXXXXXXd ddddXbbb: lonely bit in LSB is 0 in all cases, so we
; ignore it.
.db 0b11111000 ; BLD
.db 0b11111010 ; BST
.db 0b11111100 ; SBRC
.db 0b11111110 ; SBRS
.db 0x05, 0b11111000, 0x00 ; BLD
.db 0x05, 0b11111010, 0x00 ; BST
.db 0x05, 0b11111100, 0x00 ; SBRC
.db 0x05, 0b11111110, 0x00 ; SBRS
; k(12): XXXXkkkk kkkkkkkk
.db 0b11010000 ; RCALL
.db 0b11000000 ; RJMP
.db 0x00, 0b11010000, 0x00 ; RCALL
.db 0x00, 0b11000000, 0x00 ; RJMP
; IN and OUT
.db 0b10110000 ; IN
.db 0b10111000 ; OUT
; 16-bit constant masks associated with each instruction. In the same order as
; in instrNames
instrUpMasks2:
.db 0x08, 0b10110000, 0x00 ; IN
.db 0x07, 0b10111000, 0x00 ; OUT
; no arg
.db 0b10010101, 0b10011000 ; BREAK
.db 0b10010100, 0b10001000 ; CLC
.db 0b10010100, 0b11011000 ; CLH
.db 0b10010100, 0b11111000 ; CLI
.db 0b10010100, 0b10101000 ; CLN
.db 0b10010100, 0b11001000 ; CLS
.db 0b10010100, 0b11101000 ; CLT
.db 0b10010100, 0b10111000 ; CLV
.db 0b10010100, 0b10011000 ; CLZ
.db 0b10010101, 0b00011001 ; EICALL
.db 0b10010100, 0b00011001 ; EIJMP
.db 0b10010101, 0b00001001 ; ICALL
.db 0b10010100, 0b00001001 ; IJMP
.db 0b00000000, 0b00000000 ; NOP
.db 0b10010101, 0b00001000 ; RET
.db 0b10010101, 0b00011000 ; RETI
.db 0b10010100, 0b00001000 ; SEC
.db 0b10010100, 0b01011000 ; SEH
.db 0b10010100, 0b01111000 ; SEI
.db 0b10010100, 0b00101000 ; SEN
.db 0b10010100, 0b01001000 ; SES
.db 0b10010100, 0b01101000 ; SET
.db 0b10010100, 0b00111000 ; SEV
.db 0b10010100, 0b00011000 ; SEZ
.db 0b10010101, 0b10001000 ; SLEEP
.db 0b10010101, 0b10101000 ; WDR
.db 0x00, 0b10010101, 0b10011000 ; BREAK
.db 0x00, 0b10010100, 0b10001000 ; CLC
.db 0x00, 0b10010100, 0b11011000 ; CLH
.db 0x00, 0b10010100, 0b11111000 ; CLI
.db 0x00, 0b10010100, 0b10101000 ; CLN
.db 0x00, 0b10010100, 0b11001000 ; CLS
.db 0x00, 0b10010100, 0b11101000 ; CLT
.db 0x00, 0b10010100, 0b10111000 ; CLV
.db 0x00, 0b10010100, 0b10011000 ; CLZ
.db 0x00, 0b10010101, 0b00011001 ; EICALL
.db 0x00, 0b10010100, 0b00011001 ; EIJMP
.db 0x00, 0b10010101, 0b00001001 ; ICALL
.db 0x00, 0b10010100, 0b00001001 ; IJMP
.db 0x00, 0b00000000, 0b00000000 ; NOP
.db 0x00, 0b10010101, 0b00001000 ; RET
.db 0x00, 0b10010101, 0b00011000 ; RETI
.db 0x00, 0b10010100, 0b00001000 ; SEC
.db 0x00, 0b10010100, 0b01011000 ; SEH
.db 0x00, 0b10010100, 0b01111000 ; SEI
.db 0x00, 0b10010100, 0b00101000 ; SEN
.db 0x00, 0b10010100, 0b01001000 ; SES
.db 0x00, 0b10010100, 0b01101000 ; SET
.db 0x00, 0b10010100, 0b00111000 ; SEV
.db 0x00, 0b10010100, 0b00011000 ; SEZ
.db 0x00, 0b10010101, 0b10001000 ; SLEEP
.db 0x00, 0b10010101, 0b10101000 ; WDR
; Rd(5): XXXXXXXd ddddXXXX
.db 0b10010100, 0b00000101 ; ASR
.db 0b10010100, 0b00000000 ; COM
.db 0b10010100, 0b00001010 ; DEC
.db 0b10010100, 0b00000011 ; INC
.db 0b10010010, 0b00000110 ; LAC
.db 0b10010010, 0b00000101 ; LAS
.db 0b10010010, 0b00000111 ; LAT
.db 0b10010100, 0b00000110 ; LSR
.db 0b10010100, 0b00000001 ; NEG
.db 0b10010000, 0b00001111 ; POP
.db 0b10010010, 0b00001111 ; PUSH
.db 0b10010100, 0b00000111 ; ROR
.db 0b10010100, 0b00000010 ; SWAP
.db 0b10010010, 0b00000100 ; XCH
.db 0x01, 0b10010100, 0b00000101 ; ASR
.db 0x01, 0b10010100, 0b00000000 ; COM
.db 0x01, 0b10010100, 0b00001010 ; DEC
.db 0x01, 0b10010100, 0b00000011 ; INC
.db 0x01, 0b10010010, 0b00000110 ; LAC
.db 0x01, 0b10010010, 0b00000101 ; LAS
.db 0x01, 0b10010010, 0b00000111 ; LAT
.db 0x01, 0b10010100, 0b00000110 ; LSR
.db 0x01, 0b10010100, 0b00000001 ; NEG
.db 0x01, 0b10010000, 0b00001111 ; POP
.db 0x01, 0b10010010, 0b00001111 ; PUSH
.db 0x01, 0b10010100, 0b00000111 ; ROR
.db 0x01, 0b10010100, 0b00000010 ; SWAP
.db 0x01, 0b10010010, 0b00000100 ; XCH
; Same signature as getInstID in instr.asm
; Reads string in (HL) and returns the corresponding ID (I_*) in A. Sets Z if
@ -233,13 +238,46 @@ getInstID:
; resulting opcode(s) in I/O.
; Sets Z on success. On error, A contains an error code (ERR_*)
parseInstruction:
; BC, during .spit, is ORred to the spitted opcode.
; *** Step 1: initialization
; Except setting up our registers, we also check if our index < I_ADC.
; If we are, we skip regular processing for the .BR processing, which
; is a bit special.
; During this processing, BC is used as the "upcode WIP" register. It's
; there that we send our partial values until they're ready to spit to
; I/O.
ld bc, 0
; Save Instr ID in D, which is less volatile than A. In almost all
; cases, we fetch the opcode constant at the end of the processing.
ld d, a
ld e, a ; Let's keep that instrID somewhere safe
; First, let's fetch our table row
cp I_ADC
jp c, .BR
jp c, .BR ; BR is special, no table row
; *** Step 2: parse arguments
sub I_ADC ; Adjust index for table
; Our row is at instrTbl + (A * 3)
ld hl, instrTbl
call addHL
sla a ; A * 2
call addHL ; (HL) is our row
ld a, (hl)
push hl ; --> lvl 1
ld hl, 0
or a
jr z, .noarg
dec a ; argspec index is 1-based
ld hl, argSpecs
sla a ; A * 2
call addHL ; (HL) is argspec row
push hl \ pop ix
call _parseArgs
.noarg:
pop ix ; <-- lvl 1, IX is now our tblrow
ret nz
; *** Step 3: place arguments in binary upcode and spit.
; (IX) is table row
; Parse arg values now in H and L
; InstrID is E
ld a, e ; InstrID
cp I_ANDI
jr c, .spitRd5Rr5
cp I_BLD
@ -252,21 +290,12 @@ parseInstruction:
cp I_OUT
jp z, .spitOUT
cp I_ASR
jr c, .spitNoArg
jp c, .spit ; no arg
; spitRd5
ld ix, argSpecs ; 'R', 0
call _parseArgs
ld a, h
call .placeRd
; continue to .spitNoArg
.spitNoArg:
call .getUp2
jp .spit
.spitRd5Rr5:
ld ix, argSpecs+2 ; 'R', 'R'
call _parseArgs
ret nz
ld a, h
call .placeRd
ld a, l
@ -281,14 +310,9 @@ parseInstruction:
rra \ rra \ rra
or b
ld b, a
call .getUp1
; now that's our MSB
jp .spitMSB
.spitRdK8:
ld ix, argSpecs+6 ; 'r', 8
call _parseArgs
ret nz
ld a, h ; Rd
call .placeRd
ld a, l ; K
@ -302,25 +326,19 @@ parseInstruction:
and 0xf0
rra \ rra \ rra \ rra
ld b, a
call .getUp1
jp .spitMSB
.spitRdBit:
ld ix, argSpecs+8 ; 'R', 'b'
call _parseArgs
ret nz
ld a, h
call .placeRd
or l
; LSB is in A and is ready to go
call ioPutB
call .getUp1
jr .spitMSB
.spitK12:
; Let's deal with the upcode constant before we destroy DE below
call .getUp1
ld b, (hl)
; Let's deal with the upcode constant before we destroy IX below
ld b, (ix+1)
call readWord
call parseExpr
ret nz
@ -348,18 +366,11 @@ parseInstruction:
jp ioPutB
.spitOUT:
ld ix, argSpecs+12 ; 'A', 'R'
call _parseArgs
ret nz
ld a, h
ld h, l
ld l, a
jr .spitINOUT
; Continue to spitIN
.spitIN:
ld ix, argSpecs+14 ; 'R', 'A'
call _parseArgs
ret nz
.spitINOUT:
; Rd in H, A in L
ld a, h
call .placeRd
@ -374,18 +385,14 @@ parseInstruction:
and 0b110
or b
ld b, a
; MSB is almost ready
call .getUp1
jr .spitMSB
.spit:
; LSB is spit *before* MSB
inc hl
ld a, (hl)
ld a, (ix+2)
or c
call ioPutB
dec hl
.spitMSB:
ld a, (hl)
ld a, (ix+1)
or b
call ioPutB
xor a ; ensure Z, set success
@ -451,21 +458,6 @@ parseInstruction:
ld c, a
ret
; Fetch a 8-bit upcode specified by instr index in D and set that upcode in HL
.getUp1:
ld a, d
sub I_ADC
ld hl, instrUpMasks1
jp addHL
; Fetch a 16-bit upcode specified by instr index in D and set that upcode in HL
.getUp2:
ld a, d
sub I_BREAK
sla a ; A * 2
ld hl, instrUpMasks2
jp addHL
; Argspecs: two bytes describing the arguments that are accepted. Possible
; values:
;
@ -492,7 +484,7 @@ argSpecs:
.db 'A', 'R' ; A(6) + Rr(5)
.db 'R', 'A' ; Rd(5) + A(6)
; Parse arguments in (HL) according to specs in IX
; Parse arguments from I/O according to specs in IX
; Puts the results in HL (which is not needed anymore after the parsing).
; First arg in H, second in L.
; This routine is not used in all cases, some ops don't fit this pattern well