honeylisp/test.fnl
Jeremy Penner 1a93fc7e84 A bunch of stuff
- refactor assembler to be more modular / extensible
- fix a bunch of bugs
- better error reporting
- stop using imgui in favour of lite commands
- in-editor hotswap & eval hotkeys
- machine:write in batches so bytes aren't dropped
- first cut at stack VM primitives
2020-09-20 13:55:06 -04:00

157 lines
3.3 KiB
Fennel

(local {: program} (require "asm"))
(local {: stream : kvstream : one} (require "stream"))
(local prg (program))
(local code1 (prg:org 0xc00))
; (prg:block :print-chars-forever 0x0c00
; :start
; [:dex]
; [:txa]
; [:jsr :0xfded]
; [:jmp :start])
(local vm {
:IP :0x40
:IPH :0x41
:W :0x42
:WH :0x43
:ROFF :0x44
:TOP :0x80
:TOPH :0x81
:ST1 :0x7e
:ST1H :0x7f
:ST2 :0x7c
:ST2H :0x7d
:RSTACK :0x6000
:ret (fn [self] [:jmp :next])
:push
(fn [self v]
(local l (bit.band v 0xff))
(local h (bit.band (bit.rshift v 8) 0xff))
[:block
[:inx]
[:inx]
[:lda l]
[:sta [self.TOP :x]]
[:lda h]
[:sta [self.TOPH :x]]
])
:drop (fn [self] [:block [:dex] [:dex]])
:def
(fn [self name ...]
(code1:append name (table.unpack (lume.concat [...] [(self:ret)]))))
})
(fn inc16 [l h]
[:block
[:inc l]
[:bne :done]
[:inc h]
:done
])
(fn add16 [l h]
[:block
[:adc l]
[:bcc :go]
[:inc h]
:go
])
(code1:append :next
[:lda vm.IP] [:sta vm.W]
[:lda vm.IPH] [:sta vm.WH]
[:lda 2] (add16 vm.IP vm.IPH)
[:jmp [vm.W]])
(vm:def
[:pla] [:sta vm.IP] [:pla] [:sta vm.IPH]
(inc16 vm.IP vm.IPH))
(vm:def
:subroutine ; usage: [jsr :subroutine] followed by bytecode
[:ldy vm.ROFF]
[:lda vm.IP] [:sta vm.RSTACK :y] [:iny]
[:lda vm.IPH] [:sta vm.RSTACK :y] [:iny]
:interpret ; usage: [jsr :interpret] followed by bytecode
[:pla] [:sta vm.IP] [:pla] [:sta vm.IPH]
(inc16 vm.IP vm.IPH))
(vm:def :ret
[:ldy vm.ROFF]
[:dey] [:lda vm.RSTACK :y] [:sta vm.IPH]
[:dey] [:lda vm.RSTACK :y] [:sta vm.IP]
[:sty vm.ROFF])
(code1:append :native [:jmp [vm.IP]])
(code1:append :quit [:rts])
(vm:def :mixed-hires
[:sta :0xc050]
[:sta :0xc057]
[:sta :0xc053])
(vm:def :drop (vm:drop))
(vm:def :dup
[:inx] [:inx]
[:lda vm.ST1H :x]
[:sta vm.TOPH :x]
[:lda vm.ST1 :x]
[:sta vm.TOP :x])
(vm:def :swap
[:lda vm.TOP :x]
[:ldy vm.ST1 :x]
[:sty vm.TOP :x]
[:sta vm.ST1 :x]
[:lda vm.TOPH :x]
[:ldy vm.ST1H :x]
[:sty vm.TOPH :x]
[:sta vm.ST1H :x])
(vm:def :>rot ; (a b c -- c a b)
[:lda vm.TOP :x] ; a: c (a b c)
[:ldy vm.ST2 :x] ; y: a (a b c)
[:sta vm.ST2 :x] ; a: c (c b c)
[:lda vm.ST1 :x] ; a: b (c b c)
[:sta vm.TOP :x] ; a: b (c b b)
[:sty vm.ST1 :x] ; y: a (c a b)
[:lda vm.TOPH :x] ; a: c (a b c)
[:ldy vm.ST2H :x] ; y: a (a b c)
[:sta vm.ST2H :x] ; a: c (c b c)
[:lda vm.ST1H :x] ; a: b (c b c)
[:sta vm.TOPH :x] ; a: b (c b b)
[:sty vm.ST1H :x] ; y: a (c a b)
)
(vm:def :<rot ; (a b c -- b c a)
[:lda vm.TOP :x] ; a: c (a b c)
[:ldy vm.ST1 :x] ; y: b (a b c)
[:sta vm.ST1 :x] ; a: c (a c c)
[:lda vm.ST2 :x] ; a: a (a c c)
[:sta vm.TOP :x] ; a: a (a c a)
[:sty vm.ST1 :x] ; y: b (b c a)
[:lda vm.TOPH :x] ; a: c (a b c)
[:ldy vm.ST1H :x] ; y: b (a b c)
[:sta vm.ST1H :x] ; a: c (a c c)
[:lda vm.ST2H :x] ; a: a (a c c)
[:sta vm.TOPH :x] ; a: a (a c a)
[:sty vm.ST1H :x] ; y: b (b c a)
)
(vm:def "@"
[:lda [vm.TOP :x]]
[:tay]
(inc16 vm.TOP vm.TOPH)
[:lda [vm.TOP :x]]
[:sta vm.TOPH :x]
[:sty vm.TOP :x])
(vm:def :lit
[:inx] [:inx] [:ldy 0]
[:lda [vm.IP] :y] [:sta [vm.TOP :x]]
[:lda [vm.IPH] :y] [:sta [vm.TOP :x]]
[:lda 2] (add16 vm.IP vm.IPH))
(prg:assemble)
(set prg.start-symbol :mixed-hires)
prg