mirror of
https://github.com/g012/l65.git
synced 2024-06-11 10:29:27 +00:00
247 lines
9.1 KiB
Lua
247 lines
9.1 KiB
Lua
local M = {}
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local symbols={} M.symbols=symbols
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local locations={} M.locations=locations
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local stats={} M.stats=stats
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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] = v & 0xff
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bin[#bin+1] = (v>>8) & 0xff
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end
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M.link = function()
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assert(not stats.unused, "can't link twice")
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stats.unused = 0
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for _,location in ipairs(locations) do
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local sections = location.sections
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local chunk_reserve = function(chunk_ix, chunk, start, size)
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if start == chunk.start then
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if size == chunk.size then location.chunks[chunk_ix] = nil
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else chunk.start=start+size chunk.size=chunk.size-size end
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else
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if chunk.size - (start - chunk.start) == size then chunk.size = chunk.size - size
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else
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chunk.size = start - chunk.start
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table.insert(location.chunks, chunk_ix+1, { start=start+size, size=chunk.start+chunk.size-(start+size) })
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end
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end
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end
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-- filter sections list
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local position_independent_sections = {}
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local symbols_to_remove = {}
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for ix,section in ipairs(sections) do
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if symbols[section.label] then error("duplicate symbol: " .. section.label) end
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symbols[section.label] = section
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section:compute_size()
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if section.size == 0 then
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sections[ix]=nil
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if not section.org then table.insert(symbols_to_remove, section.label) end
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elseif not section.org then table.insert(position_independent_sections, section) end
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end
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for _,v in ipairs(symbols_to_remove) do symbols[v] = nil end
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-- fixed position sections
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for section_ix,section in ipairs(sections) do if section.org then
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if section.org < location.start or section.org > location.finish then
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error("ORG section " .. section.label .. " starts outside container location")
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end
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for chunk_ix,chunk in ipairs(location.chunks) do
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if chunk.start <= section.org and chunk.size - (section.org - chunk.start) >= section.size then
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chunk_reserve(chunk_ix, chunk, section.org, section.size)
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goto chunk_located
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end
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end
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error("ORG section " .. section.label .. " overflows its location")
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::chunk_located::
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end end
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-- position independent sections
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table.sort(position_independent_sections, function(a,b) return a.size < b.size end)
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while #position_independent_sections > 0 do
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local section = position_independent_sections[1]
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local chunks = {}
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for _,chunk in ipairs(location.chunks) do
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if chunk.size >= section.size then chunks[#chunks+1] = chunk end
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end
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table.sort(chunks, function(a,b) return a.size < b.size end)
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for chunk_ix,chunk in ipairs(chunks) do
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local waste,position = math.maxinteger
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local usage_lowest = function(start, finish)
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local inc=1
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if section.align then
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start = (start + section.align - 1) // section.align * section.align
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if section.offset then start = start + section.offset end
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inc = section.align
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end
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for address=start,finish,inc do
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for _,constraint in ipairs(section.constraints) do
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local start, finish = address+contraint.start, address+constraint.finish
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if start // 0x100 == finish // 0x100 then
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if constraint.type == 'crosspage' then goto constraints_not_met end
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else
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if constraint.type == 'samepage' then goto constraints_not_met end
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end
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end
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local w = math.min(address - chunk.start, chunk.size - (address - chunk.start))
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if w < waste then waste=w position=address end
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::constraints_not_met::
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end
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end
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local finish = math.min(chunk.start + 0xff, chunk.start + chunk.size - section.size)
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usage_lowest(chunk.start, finish)
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if chunk.size ~= math.huge then
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local start = math.max(chunk.start + chunk.size - section.size - 0xff, chunk.start)
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usage_lowest(start, chunk.start + chunk.size - section.size)
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end
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if position then
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chunk_reserve(chunk_ix, chunk, position, section.size)
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section.org = position
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goto chunk_located
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end
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end
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error("unable to find space for section " .. section.label)
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::chunk_located::
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end
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-- unused space stats
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local unused = 0
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for _,chunk in ipairs(location.chunks) do unused = unused + chunk.size - chunk.start end
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location.unused = unused
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stats.unused = stats.unused + unused
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end
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end
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M.genbin = function(filler)
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if not filler then filler = 0xff end
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if not stats.unused then M.link() end
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local bin = {}
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local ins = table.insert
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table.sort(locations, function(a,b) return a.start < b.start end)
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local position = 0
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for _,location in ipairs(locations) do
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if location.start < position then
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error(string.format("location [%04x,%04x] overlaps another",
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location.start, math.type(location.size) == 'integer' and (location.size + location.start) or 0xffff))
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end
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for i=position,location.start do ins(bin, filler) end
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position = location.start
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local sections = location.sections
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table.sort(sections, function(a,b) return a.start < b.start end)
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for _,section in sections do
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assert(section.org >= position)
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for i=position,section.org do ins(bin, filler) end
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for _,instruction in ipairs(section.instructions) do
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-- TODO
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end
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end
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if math.type(location.size) == 'integer' then
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local endpos = location.size+location.start
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for i=position,endpos do ins(bin, filler) end
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position = endpos
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end
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end
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return bin
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end
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M.writebin = function(filename, bin)
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if not filename then filename = 'main.bin' end
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if not bin then bin = M.genbin() end
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local f = assert(io.open(filename, "wb"), "failed to open " .. filename .. " for writing")
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local sconv,s=string.char,{} for i=1,#bin do s[i] = sconv(bin[i]) end
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f:write(table.concat(s))
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f:close()
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end
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M.writesym = function(filename)
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if not filename then filename = 'main.sym' end
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local f = assert(io.open(filename, "wb"), "failed to open " .. filename .. " for writing")
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table.sort(symbols)
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local ins,fmt,rep = table.insert,string.format,string.rep
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local s ={'--- Symbol List'}
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for k,v in pairs(symbols) do ins(s, fmt("%s%s %04x", k, rep(' ',24-#k), type(v)=='table' and v.org or v)) end
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s[#s+1] = '--- End of Symbol List.'
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f:write(table.concat(s, '\n'))
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f:close()
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end
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M.location = function(start, finish)
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local size = (finish or math.huge) - start
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locations[#locations+1] = { start=start, finish=finish, chunks={ { start=start, size=size } } }
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end
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M.section = function(t)
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local section = {}
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if (type(t) == 'string') then section.label = t
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else
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assert(type(t) == 'table')
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assert(type(t[1]) == 'string' and string.len(t[1]) > 0)
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section=t section.label=t[1] section[1]=nil
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if section.offset and not section.align then error("section " .. section.label .. " has offset, but no align") end
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end
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table.insert(location[#locations].sections, section)
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section.constraints = {}
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section.instructions = {}
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function section:compute_size()
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self.size = 0
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for _,instruction in ipairs(self.instructions) do
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-- TODO
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end
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end
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end
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M.samepage = function()
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end
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M.crosspage = function()
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end
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M.endpage = function()
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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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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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}
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encode = {
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adc=0x60,
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['and']=0x20,
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asl=0x01,
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lda=0xa0,
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sta=0x80,
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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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