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321 lines
5.1 KiB
Markdown
321 lines
5.1 KiB
Markdown
SixtyPical: Instruction Support
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===============================
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Unsupported Opcodes
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-------------------
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6502 opcodes with no language-level equivalent instructions in SixtyPical
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are `brk`, `cli`, `pla`, `plp`, `rti`, `rts`, `tsx`, `txs`. These may be
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inserted into the output program as a SixtyPical → 6502 compiler sees fit,
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however.
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Note to self, the `pl` opcodes *do* change flags.
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Instruction Support so far
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--------------------------
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A `X` indicates unsupported.
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Funny syntax indicates use of a special form.
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In these, `absolute` must be a `reserve`d or `locate`d address.
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`immediate` must be a literal decimal or hexadecimal number
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(or in future, a declared constant.)
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adc #immediate
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adc absolute
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and #immediate
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and absolute
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asl
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asl absolute
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if bcc { block } else { block }
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if bcs { block } else { block }
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if beq { block } else { block }
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bit absolute
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if bmi { block } else { block }
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if bne { block } else { block }
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if bpl { block } else { block }
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if bvc { block } else { block }
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if bvs { block } else { block }
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clc
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cld
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clv
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cmp #immediate
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cmp absolute
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cpx #immediate
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cpx absolute
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cpy #immediate
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cpy absolute
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dec absolute
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dex
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dey
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eor #immediate
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eor absolute
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inc absolute
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inx
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iny
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jsr routine
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jmp (vector)
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lda #immediate
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lda absolute
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lda absolute, x
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lda absolute, y
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lda (absolute), y
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ldx #immediate
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ldx absolute
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ldy #immediate
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ldy absolute
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lsr
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lsr absolute
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nop
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ora #immediate
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ora absolute
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pha { block }
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php { block }
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rol
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rol absolute
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ror
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ror absolute
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sbc #immediate
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sbc absolute
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sec
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sed
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sei { block }
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sta absolute
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sta absolute, x
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sta absolute, y
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sta (absolute), y
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stx absolute
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sty absolute
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tax
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tay
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txa
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tya
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Tests
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-----
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Should be merged with the above nicely someday.
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-> Tests for functionality "Emit ASM for SixtyPical program"
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Big test for parsing and emitting instructions.
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| reserve word vword
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| reserve byte vbyte
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| assign byte[256] table 1024
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| routine main {
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| lda #4
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| ldx #0
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| ldy #$FF
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| lda vbyte
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| lda table, x
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| lda table, y
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| lda (vword), y
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| lda <vword
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| lda >vword
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| inc vbyte
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| tax
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| inx
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| dex
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| stx vbyte
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| tay
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| iny
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| dey
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| sty vbyte
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| cmp vbyte
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| cmp #30
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| cmp <vword
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| cmp >vword
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| ldx vbyte
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| cpx vbyte
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| cpx #31
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| txa
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| ldy vbyte
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| cpy vbyte
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| cpy #32
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| tya
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| sta vbyte
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| sta table, x
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| sta table, y
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| sta (vword), y
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| sta <vword
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| sta >vword
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| dec vbyte
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| clc
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| cld
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| clv
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| sec
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| sed
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| adc #8
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| adc vbyte
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| and #8
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| and vbyte
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| sbc #8
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| sbc vbyte
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| ora #8
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| ora vbyte
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| }
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= main:
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= lda #4
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= ldx #0
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= ldy #255
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= lda vbyte
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= lda table, x
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= lda table, y
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= lda (vword), y
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= lda vword
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= lda vword+1
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= inc vbyte
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= tax
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= inx
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= dex
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= stx vbyte
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= tay
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= iny
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= dey
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= sty vbyte
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= cmp vbyte
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= cmp #30
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= cmp vword
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= cmp vword+1
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= ldx vbyte
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= cpx vbyte
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= cpx #31
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= txa
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= ldy vbyte
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= cpy vbyte
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= cpy #32
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= tya
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= sta vbyte
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= sta table, x
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= sta table, y
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= sta (vword), y
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= sta vword
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= sta vword+1
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= dec vbyte
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= clc
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= cld
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= clv
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= sec
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= sed
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= adc #8
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= adc vbyte
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= and #8
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= and vbyte
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= sbc #8
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= sbc vbyte
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= ora #8
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= ora vbyte
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= rts
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=
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= .data
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= .space vword 2
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= .space vbyte 1
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= .alias table 1024
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| reserve word vword
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| reserve byte vbyte
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| assign byte[256] table 1024
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| routine main {
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| asl .a
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| asl vbyte
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| lsr .a
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| lsr vbyte
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| rol .a
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| rol vbyte
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| ror .a
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| ror vbyte
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| bit vbyte
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| eor #5
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| eor vbyte
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| }
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= main:
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= asl
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= asl vbyte
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= lsr
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= lsr vbyte
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= rol
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= rol vbyte
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= ror
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= ror vbyte
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= bit vbyte
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= eor #5
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= eor vbyte
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= rts
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=
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= .data
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= .space vword 2
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= .space vbyte 1
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= .alias table 1024
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| routine main {
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| with pha {
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| with sei {
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| with php {
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| lda #0
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| }
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| lda #1
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| }
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| lda #2
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| }
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| }
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= main:
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= pha
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= sei
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= php
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= lda #0
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= plp
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= lda #1
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= cli
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= lda #2
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= pla
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= rts
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