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Started 6502 code.
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g012
parent
01a1e5e514
commit
c054cadd1e
118
6502.lua
118
6502.lua
@ -1,3 +1,51 @@
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local M = {}
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local byte_normalize = function(v)
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if v < -128 or v > 255 then error("value out of byte range: " .. v) end
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if v < 0 then v = v + 0x100 end
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return v & 0xff
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end
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local word_normalize = function(v)
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if v < -32768 or v > 65535 then error("value out of word range: " .. v) end
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if v < 0 then v = v + 0x10000 end
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return v & 0xffff
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end
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local byte_emit = function(v, bin)
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assert(v >=0 and v <= 0xff)
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bin[#bin+1] = v
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end
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local word_emit = function(v, bin)
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assert(v >=0 and v <= 0xffff)
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bin[#bin+1] = 0xff & (v % 0x100)
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bin[#bin+1] = 0xff & (v // 0x100)
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end
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M.byte = function(...)
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local data = {...}
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for _,v in ipairs(data) do byte_emit(byte_normalize(v)) end
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end
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M.word = function(...)
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local data = {...}
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for _,v in ipairs(data) do word_emit(word_normalize(v)) end
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end
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M.section = function(t)
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local s = {}
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if (type(t) == 'string') then s.name = t
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else
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assert(type(t) == 'table')
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assert(type(t.name) == 'string' and string.len(t.name) > 0)
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s = t
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end
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s.instructions = {}
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end
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return M
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--[===[
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adressing = {
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imm=0x09, zp=0x05, zpx=0x15, ab=0x0d, abx=0x1d, aby=0x19, inx=0x01, iny=0x11,
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acc=0x09,
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@ -11,72 +59,4 @@ encode = {
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--lda = { imm=0xa9, zp=0xa5, zpx=0xb5, ab=0xad, abx=0xbd, aby=0xb9, inx=0xa1, iny=0xb1 },
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}
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--[=[
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adressages:
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lda #10 lda(10) lda"#10"
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lda 10 lda{10} lda"10"
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lda 10,x lda{10,"x"} ldax{10} lda{x=10} lda"10,x"
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lda $1000 lda{0x1000}
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lda $1000,x lda{0x1000,"x"} ldax{0x1000}
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lda $1000,y lda{0x1000,"y"} lday{0x1000}
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lda (10,x) lda{10,"(x)"} lda_x{10} a=(10,x) a=mem[zp[10+x]] lda"(10,x)"
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lda (10),y lda{10,"(y)"} lda_y{10} a=(10),y a=mem[zp[10]+y] lda"(10),y"
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sta 10 sta{10}
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sta 10,x sta{10,"x"}
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sta $1000 sta{0x1000}
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sta $1000,x sta{0x1000,"x"}
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sta $1000,y sta{0x1000,"y"}
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sta (10,x) sta{10,"(x)"}
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sta (10),y sta{10,"(y)"}
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]=]
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local function setfenv(fn, env)
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local i = 1
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while true do
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local name = debug.getupvalue(fn, i)
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if name == "_ENV" then
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debug.upvaluejoin(fn, i, (function() return env end), 1)
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break
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elseif not name then break end
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i = i + 1
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end
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return fn
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end
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local function getfenv(fn)
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local i = 1
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while true do
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local name, val = debug.getupvalue(fn, i)
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if name == "_ENV" then return val
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elseif not name then break end
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i = i + 1
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end
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end
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asm6502_env = {
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lda = function(v)
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emit(0xa9, v)
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end,
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}
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function asm(f, ...)
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setfenv(f, asm6502_env)
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f(...)
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end
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a,x,y = 0,0,0
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do
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local regs = { a="a", x="x", y="y" }
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setmetatable(_G, {
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__index = function(t,k,v)
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if regs[k] then assert(loadstring("ld" .. k .. "(" .. v .. ")"))() end
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return t[k]
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end,
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__newindex = function(t,k,v)
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if regs[k] then assert(loadstring("st" .. k .. "(" .. v .. ")"))() end
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t[k] = v
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end,
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})
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end
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]===]
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4
asm.lua
4
asm.lua
@ -13,9 +13,9 @@ xyz = 1 << 2
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x:f()
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::lualabel::
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syntax6502_off
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#pragma syntax6502 off
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lda = 5 if lda < 6 then print('yep') end
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syntax6502_on
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#pragma syntax6502 on
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--@@data samepage byte(1, 2) crosspage byte(3, 4)
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129
l65.lua
129
l65.lua
@ -2046,112 +2046,29 @@ local function Format65(ast)
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return table.concat(out.rope)
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end
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local function splitFilename(name)
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if name:find(".") then
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local p, ext = name:match("()%.([^%.]*)$")
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if p and ext then
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if #ext == 0 then
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return name, nil
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else
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local filename = name:sub(1,p-1)
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return filename, ext
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end
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else
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return name, nil
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end
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else
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return name, nil
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end
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if #arg ~= 2 then
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print("Invalid arguments, usage:\nl65 source destination")
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return
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end
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if #arg == 1 then
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local name, ext = splitFilename(arg[1])
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local outname = name.."_min"
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if ext then outname = outname.."."..ext end
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--
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local inf = io.open(arg[1], 'r')
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if not inf then
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print("Failed to open '"..arg[1].."' for reading")
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return
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end
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--
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local sourceText = inf:read('*all')
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inf:close()
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--
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local st, ast = ParseLua(sourceText)
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if not st then
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--we failed to parse the file, show why
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print(ast)
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return
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end
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--
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local outf = io.open(outname, 'w')
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if not outf then
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print("Failed to open '"..outname.."' for writing")
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return
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end
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--
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outf:write(Format65(ast))
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outf:close()
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--
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elseif #arg == 2 then
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--keep the user from accidentally overwriting their non-minified file with
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if arg[1]:find("_min") then
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print("Did you mix up the argument order?\n"..
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"Current command will minify '"..arg[1].."' and OVERWRITE '"..arg[2].."' with the results")
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while true do
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io.write("Confirm (yes/cancel): ")
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local msg = io.read('*line')
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if msg == 'yes' then
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break
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elseif msg == 'cancel' then
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return
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end
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end
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end
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local inf = io.open(arg[1], 'r')
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if not inf then
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print("Failed to open '"..arg[1].."' for reading")
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return
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end
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--
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local sourceText = inf:read('*all')
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inf:close()
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--
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local st, ast = ParseLua(sourceText)
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if not st then
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--we failed to parse the file, show why
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print(ast)
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return
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end
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--
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if arg[1] == arg[2] then
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print("Are you SURE you want to overwrite the source file?")
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while true do
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io.write("Confirm (yes/cancel): ")
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local msg = io.read('*line')
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if msg == 'yes' then
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break
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elseif msg == 'cancel' then
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return
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end
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end
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end
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local outf = io.open(arg[2], 'w')
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if not outf then
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print("Failed to open '"..arg[2].."' for writing")
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return
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end
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--
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outf:write(Format65(ast))
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outf:close()
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--
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else
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print("Invalid arguments, usage:\nl65 source [destination]")
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local inf = io.open(arg[1], 'r')
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if not inf then
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print("Failed to open '"..arg[1].."' for reading")
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return
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end
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local outf = io.open(arg[2], 'w')
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if not outf then
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print("Failed to open '"..arg[2].."' for writing")
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return
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end
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local sourceText = inf:read('*all')
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inf:close()
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local st, ast = ParseLua(sourceText)
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if not st then
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print(ast)
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return
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end
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outf:write(Format65(ast))
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outf:close()
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