honeylisp/asm/asm.fnl

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(local lume (require "lib.lume"))
(local {: int8-to-bytes : int16-to-bytes} (require "lib.util"))
(local opcodes {})
; op mode arg
; single-byte ops
(let [ops
{:php 0x08 :plp 0x28 :pha 0x48 :pla 0x68 :dey 0x88 :tay 0xa8 :iny 0xc8 :inx 0xe8
:clc 0x18 :sec 0x38 :cli 0x58 :sei 0x78 :tya 0x98 :clv 0xb8 :cld 0xd8 :sed 0xf8
:txa 0x8a :txs 0x9a :tax 0xaa :tsx 0xba :dex 0xca :nop 0xea :brk 0x00 :rti 0x40
:rts 0x60}]
(each [opcode byte (pairs ops)]
(tset opcodes opcode (fn [mode] (if mode nil byte)))))
; branch ops
(let [ops {:bpl 0x10 :bmi 0x30 :bvc 0x50 :bvs 0x70 :bcc 0x90 :bcs 0xb0 :bne 0xd0 :beq 0xf0}]
(each [opcode byte (pairs ops)]
(tset opcodes opcode (fn [mode] (if (= mode :rel) byte nil)))))
(set opcodes.jsr (fn [mode] (if (= mode :abs) 0x20 nil)))
; aaabbbcc ops
(fn aaabbbcc [aaa cc modemap]
(local base (bit.bor cc (bit.lshift aaa 5)))
(fn [mode]
(local bbb (. modemap mode))
(if bbb (bit.bor base (bit.lshift bbb 2)) nil)))
(fn indexed-modes [...]
(let [modemap {}]
(each [index mode (pairs [...])]
(tset modemap mode (- index 1)))
modemap))
(fn without-modes [modemap ...]
(let [newmodemap (lume.clone modemap)]
(each [_ mode (pairs [...])]
(tset newmodemap mode nil))
newmodemap))
(fn only-modes [modemap ...]
(let [newmodemap {}]
(each [_ mode (pairs [...])]
(tset newmodemap mode (. modemap mode)))
newmodemap))
; cc=1 ops
(let [cc1-modes (indexed-modes :zp-x* :zp :imm :abs :zp*-y :zp-x :abs-y :abs-x)
ops {:ora 0 :and 1 :eor 2 :adc 3 :lda 5 :cmp 6 :sbc 7}]
(each [opcode aaa (pairs ops)]
(tset opcodes opcode (aaabbbcc aaa 1 cc1-modes))
(tset opcodes :sta (aaabbbcc 4 1 (without-modes cc1-modes :imm)))))
; cc=2 ops
(let [cc2-modes (indexed-modes nil :zp :a :abs nil :zp-x nil :abs-x)]
(each [opcode aaa (pairs {:asl 0 :rol 1 :lsr 2 :ror 3})]
(tset opcodes opcode (aaabbbcc aaa 2 cc2-modes))
(each [opcode aaa (pairs {:dec 6 :inc 7})]
(tset opcodes opcode (aaabbbcc aaa 2 (without-modes cc2-modes :a))))))
(tset opcodes :stx (aaabbbcc 4 2 (indexed-modes nil :zp nil :abs nil nil :zp-y)))
(tset opcodes :ldx (aaabbbcc 5 2 (indexed-modes :imm :zp nil :abs nil nil :zp-y nil :abs-y)))
; cc=0 ops
(let [cc0-modes (indexed-modes :imm :zp nil :abs nil :zp-x nil :abs-x)]
(tset opcodes :bit (aaabbbcc 1 0 (only-modes cc0-modes :zp :abs)))
(tset opcodes :sty (aaabbbcc 4 0 (only-modes cc0-modes :zp :abs :zp-x)))
(tset opcodes :ldy (aaabbbcc 5 0 cc0-modes))
(each [opcode aaa (pairs {:cpy 6 :cpx 7})]
(tset opcodes opcode (aaabbbcc aaa 0 (only-modes cc0-modes :imm :zp :abs)))))
(tset opcodes :jmp (fn [mode] (match mode :abs 0x4c :abs* 0x6c _ nil)))
(fn size [mode]
(if
(or (= mode nil) (= mode :a)) 1
(= (mode:sub 1 3) :abs) 3
2))
(fn opsize [op] (if (= op.opcode :block) 0 (size op.mode)))
(fn parse-mode-arg [op]
(match op
[_ :a] [:a nil]
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([_ imm] ? (or (= (type imm) "number") (= (type imm) "function"))) [:imm imm]
([opcode addr] ? (and (= (type addr) "string") (= (opcode:sub 1 1) "b"))) [:rel addr] ; branch
[_ addr :x] [:addr-x addr]
[_ [addr] :y] [:zp*-y addr]
[_ addr :y] [:addr-y addr]
[_ [addr :x]] [:zp-x* addr]
([_ addr] ? (= (type addr) "string")) [:addr addr]
[_ [addr]] [:abs* addr]
[_] [nil nil]
_ (error (.. "Unrecognized syntax" (fv op)))))
(fn make-env [block parent]
{:parent parent
:block block
:is-zp? (fn [self name] (self.parent:is-zp? name))
:lookup-addr
(fn [self name]
(local ipdat (. self.block.symbols name))
(local ipdat-global (. self.block.globals name))
; (print "looking up" name "in" self)
(if
(and ipdat (> ipdat (length self.block.pdats)))
(+ self.block.addr self.block.size)
ipdat (. self.block.pdats ipdat :addr)
ipdat-global (: (make-env (. self.block.pdats ipdat-global) block) :lookup-addr name)
(self.parent:lookup-addr name)))})
(fn program [prg-base]
; dat - anything that takes up space in the assembled output (op, dw, db, etc)
; takes the form [:op args]
; pdat - a parsed dat; takes the form {:type type :addr addr ...}
(local dat-parser {})
(fn new-block [] {:type :block :pdats [] :symbols {} :globals {}})
(fn parse-dats [block dats]
(each [_ dat (ipairs dats)]
(if (= (type dat) "string")
(do (tset block.symbols dat (+ (length block.pdats) 1))
(when (= (dat:sub 1 2) "G-")
(tset block.globals dat true)))
(let [opcode (. dat 1)
parser (. dat-parser opcode)
pdat
(if parser (parser dat block)
(. opcodes opcode) (dat-parser.op dat)
(error (.. "Unrecognized opcode " (fv opcode))))]
(table.insert block.pdats pdat)
(when (and pdat pdat.globals)
(each [name _ (pairs pdat.globals)]
(tset block.globals name (length block.pdats)))))))
block)
(fn dat-parser.op [op]
(let [[mode arg] (parse-mode-arg op)]
{:type :op :opcode (. op 1) : mode : arg}))
(fn dat-parser.block [block]
(let [dats (lume.clone block)]
(table.remove dats 1)
(parse-dats (new-block) dats)))
(fn dat-parser.db [db] {:type :var :init (. db 2) :size 1})
(fn dat-parser.dw [dw] {:type :var :init (. dw 2) :size 2})
(fn dat-parser.bytes [bytes] {:type :raw :bytes (. bytes 2)})
(fn dat-parser.ref [ref] {:type :ref :target (. ref 2)})
(fn dat-parser.flatten [flat block]
(parse-dats block (lume.slice flat 2))
nil)
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(fn dat-parser.export [label block]
(tset block.globals (. label 2) true)
nil)
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(fn dat-parser.pad [pad] {:type :pad :align (. pad 2)})
(local pdat-processor {
:op {}
:var {}
:ref {}
:raw {}
:block {}
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:pad {}
})
(fn process-pdat [pdat process default ...]
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; (pp pdat)
(local processor (. pdat-processor pdat.type process))
(if processor (processor pdat ...) default))
(fn pdat-processor.op.patch [op env]
(when (and op.mode (= (op.mode:sub 1 4) :addr))
(let [zp-mode (.. :zp (op.mode:sub 5))
abs-mode (.. :abs (op.mode:sub 5))
is-zp (and ((. opcodes op.opcode) zp-mode) (env:is-zp? op.arg))]
(set op.mode (if is-zp zp-mode abs-mode)))))
(fn pdat-processor.raw.size [raw] (length raw.bytes))
(fn pdat-processor.op.size [op] (size op.mode))
(fn pdat-processor.var.size [d] d.size)
(fn pdat-processor.ref.size [r] 2)
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(fn pdat-processor.pad.size [pad] (- pad.align (% pad.addr pad.align)))
(fn pdat-processor.op.bytes [op env]
(local bytegen (. opcodes op.opcode))
; (pp op)
(if bytegen
(let [opbyte (bytegen op.mode)
argbytes
(if
(and (= op.mode :imm) (= (type op.arg) "function"))
(int8-to-bytes (op.arg env))
(= op.mode :imm) (int8-to-bytes op.arg)
(= op.mode :rel)
(int8-to-bytes (- (env:lookup-addr op.arg) (+ op.addr 2)))
(= (size op.mode) 2) (int8-to-bytes (env:lookup-addr op.arg))
(= (size op.mode) 3) (int16-to-bytes (env:lookup-addr op.arg))
"")]
(if opbyte
(.. (int8-to-bytes opbyte) argbytes)
(error (.. op.opcode " doesn't support mode " op.mode))))
""))
(fn pdat-processor.var.bytes [d env]
(match d.size
1 (int8-to-bytes (or d.init 0))
2 (int16-to-bytes (or d.init 0))
n (string.rep "\0" n)))
(fn pdat-processor.ref.bytes [ref env]
(int16-to-bytes (env:lookup-addr ref.target)))
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(fn pdat-processor.pad.bytes [pad] (string.rep "\0" pad.size))
(fn pdat-processor.block.symbols [block]
(lume.keys block.symbols))
(fn pdat-processor.block.patch [block env]
(local block-env (make-env block env))
(each [_ pdat (ipairs block.pdats)]
(process-pdat pdat :patch nil block-env)))
(fn pdat-processor.block.allocate [block addr base-org]
(var size 0)
(local baseaddr (if base-org (+ base-org.addr base-org.size) addr))
(set block.addr baseaddr)
(each [_ pdat (ipairs block.pdats)]
(set pdat.addr (+ baseaddr size))
(process-pdat pdat :allocate nil pdat.addr)
(local pdatsize (process-pdat pdat :size pdat.size))
(set pdat.size pdatsize)
(set pdat.addr (+ baseaddr size))
(set size (+ size pdatsize)))
(set block.size size))
(fn pdat-processor.block.generate [block env]
(local block-env (make-env block env))
(var bytes "")
(each [_ pdat (ipairs block.pdats)]
(process-pdat pdat :generate nil block-env)
(local pdatbytes (process-pdat pdat :bytes pdat.bytes block-env))
(assert (= (type pdatbytes) :string) (.. "failed to generate bytes: " (fv pdat)))
(set pdat.bytes pdatbytes)
(set bytes (.. bytes pdatbytes)))
(set block.bytes bytes))
{:type :program
:org-to-block {}
:symbol-to-org {}
:start-symbol :main
: dat-parser
: pdat-processor
: new-block
: prg-base
:parse-dats (fn [self block dats] (parse-dats block dats))
:dbg
(fn [self ...]
(when self.dbgfile
(for [i 1 (select :# ...)]
(when (not= i 1) (self.dbgfile:write " "))
(self.dbgfile:write (fv (select i ...))))
(self.dbgfile:write "\n")))
:debug-to
(fn [self filename]
(set self.dbgfile (io.open filename :w)))
:org
(fn [self org]
(var block (. self.org-to-block org))
(when (not block)
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(set block (new-block))
(tset self.org-to-block org block))
{: block
: org
:prg self
:ptr (fn [self] (tostring self.org))
:append (fn [self ...] (self.prg:dbg self.org ...) (parse-dats self.block [...]) self)})
:parse-addr
(fn [self name]
(local addr (tonumber name))
(if addr addr (error (.. "Symbol '" name "' not found"))))
:is-zp?
(fn [self name]
(local org (. self.symbol-to-org name))
(if org (< org 0x100)
self.prg-base (self.prg-base:is-zp? name)
(< (self:parse-addr name) 0x100)))
:env-lookup
(fn [self name lookup ...]
(local org (. self.symbol-to-org name))
(if org (: (make-env (. self.org-to-block org) self) lookup name ...)
self.prg-base (self.prg-base:env-lookup name lookup ...)
nil))
; :lookup-symbol (fn [self addr]) TODO
:lookup-addr
(fn [self name]
; (print "looking up" name "in" self)
(or (self:env-lookup name :lookup-addr) (self:parse-addr name)))
:pass
(fn [self passname]
(each [org block (pairs self.org-to-block)]
(: self passname org block (if self.prg-base (. self.prg-base.org-to-block org) nil))))
:gather-symbols
(fn [self org block]
(each [_ name (ipairs (process-pdat block :symbols []))]
(tset self.symbol-to-org name org)))
:patch (fn [self org block] (process-pdat block :patch nil self))
:allocate (fn [self org block base-org] (process-pdat block :allocate nil org base-org))
:generate (fn [self org block] (process-pdat block :generate nil self))
:debug-pass (fn [self org block] (self:dbg org block))
:assemble
(fn [self]
(self:pass :gather-symbols)
(self:pass :patch)
(self:pass :allocate)
(self:pass :debug-pass)
(self:pass :generate)
(when self.dbgfile
(self.dbgfile:close)
(set self.dbgfile nil))
self)
:upload
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(fn [self machine]
(if machine.upload (machine:upload self)
(each [org block (pairs self.org-to-block)]
(machine:write block.addr block.bytes))))
})
{:new program}