mirror of
https://github.com/notwa/lips
synced 2024-04-28 16:23:23 -07:00
312 lines
8.3 KiB
Lua
312 lines
8.3 KiB
Lua
local floor = math.floor
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local format = string.format
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local insert = table.insert
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local path = string.gsub(..., "[^.]+$", "")
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local data = require(path.."data")
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local util = require(path.."util")
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local Base = require(path.."Base")
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local bitrange = util.bitrange
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local Dumper = Base:extend()
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function Dumper:init(writer, fn, options)
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self.writer = writer
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self.fn = fn or '(string)'
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self.options = options or {}
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self.labels = setmetatable({}, {__index=options.labels})
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self.commands = {}
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self.pos = options.offset or 0
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self.lastcommand = nil
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end
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function Dumper:error(msg)
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error(format('%s:%d: Error: %s', self.fn, self.line, msg), 2)
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end
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function Dumper:export_labels(t)
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for k, v in pairs(self.labels) do
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-- only return valid labels; those that don't begin with a number
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-- (relative labels are invalid)
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if not tostring(k):sub(1, 1):find('%d') then
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t[k] = v
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end
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end
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return t
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end
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function Dumper:advance(by)
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self.pos = self.pos + by
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end
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function Dumper:push_instruction(t)
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t.kind = 'instruction'
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insert(self.commands, t)
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self:advance(4)
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end
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function Dumper:add_instruction_j(fn, line, o, T)
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self:push_instruction{fn=fn, line=line, o, T}
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end
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function Dumper:add_instruction_i(fn, line, o, s, t, i)
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self:push_instruction{fn=fn, line=line, o, s, t, i}
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end
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function Dumper:add_instruction_r(fn, line, o, s, t, d, f, c)
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self:push_instruction{fn=fn, line=line, o, s, t, d, f, c}
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end
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function Dumper:add_label(name)
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self.labels[name] = self.pos
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end
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function Dumper:add_bytes(line, ...)
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local use_last = self.lastcommand and self.lastcommand.kind == 'bytes'
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local t
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if use_last then
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t = self.lastcommand
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else
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t = {}
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t.kind = 'bytes'
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t.size = 0
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t.fn = self.fn
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t.line = self.line
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end
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t.line = line
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for _, b in ipairs{...} do
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t.size = t.size + 1
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t[t.size] = b
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end
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if not use_last then
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insert(self.commands, t)
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end
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self:advance(t.size)
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end
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function Dumper:add_directive(fn, line, name, a, b)
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self.fn = fn
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self.line = line
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local t = {}
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t.fn = self.fn
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t.line = self.line
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if name == 'BYTE' then
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self:add_bytes(line, a % 0x100)
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elseif name == 'HALFWORD' then
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local b0 = bitrange(a, 0, 7)
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local b1 = bitrange(a, 8, 15)
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self:add_bytes(line, b1, b0)
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elseif name == 'WORD' then
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if type(a) == 'string' then
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t.kind = 'label'
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t.name = a
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insert(self.commands, t)
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self:advance(4)
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else
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local b0 = bitrange(a, 0, 7)
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local b1 = bitrange(a, 8, 15)
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local b2 = bitrange(a, 16, 23)
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local b3 = bitrange(a, 24, 31)
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self:add_bytes(line, b3, b2, b1, b0)
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end
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elseif name == 'ORG' then
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t.kind = 'goto'
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t.addr = a
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insert(self.commands, t)
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self.pos = a
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self:advance(0)
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elseif name == 'ALIGN' then
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t.kind = 'ahead'
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local align
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if a == 0 then
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align = 4
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elseif a < 0 then
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self:error('negative alignment')
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else
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align = 2^a
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end
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local temp = self.pos + align - 1
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t.skip = temp - (temp % align) - self.pos
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t.fill = t.fill or 0
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insert(self.commands, t)
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self:advance(t.skip)
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elseif name == 'SKIP' then
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t.kind = 'ahead'
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t.skip = a
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t.fill = b
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insert(self.commands, t)
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self:advance(t.skip)
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else
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self:error('unimplemented directive')
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end
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end
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function Dumper:desym(t)
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if t.tt == 'REL' then
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local target = t.tok % 0x80000000
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local pos = self.pos % 0x80000000
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local rel = floor(target/4) - 1 - floor(pos/4)
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if rel > 0x8000 or rel <= -0x8000 then
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self:error('branch too far')
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end
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return rel % 0x10000
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elseif type(t.tok) == 'number' then
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if t.offset then
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return t.tok + t.offset
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end
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return t.tok
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elseif t.tt == 'REG' then
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assert(data.all_registers[t.tok], 'Internal Error: unknown register')
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return data.registers[t.tok] or data.fpu_registers[t.tok] or data.sys_registers[t.tok]
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elseif t.tt == 'LABELSYM' or t.tt == 'LABELREL' then
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local label = self.labels[t.tok]
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if label == nil then
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self:error('undefined label')
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end
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if t.offset then
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label = label + t.offset
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end
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if t.tt == 'LABELSYM' then
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return label
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end
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label = label % 0x80000000
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local pos = self.pos % 0x80000000
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local rel = floor(label/4) - 1 - floor(pos/4)
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if rel > 0x8000 or rel <= -0x8000 then
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self:error('branch too far')
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end
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return rel % 0x10000
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end
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error('Internal Error: failed to desym')
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end
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function Dumper:toval(t)
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assert(type(t) == 'table', 'Internal Error: invalid value')
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local val = self:desym(t)
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if t.index then
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val = val % 0x80000000
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val = floor(val/4)
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end
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if t.negate then
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val = -val
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end
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if t.negate or t.signed then
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if val >= 0x10000 or val < -0x8000 then
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self:error('value out of range')
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end
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val = val % 0x10000
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end
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if t.portion == 'upper' then
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val = bitrange(val, 16, 31)
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elseif t.portion == 'lower' then
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val = bitrange(val, 0, 15)
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elseif t.portion == 'upperoff' then
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local upper = bitrange(val, 16, 31)
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local lower = bitrange(val, 0, 15)
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if lower >= 0x8000 then
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-- accommodate for offsets being signed
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upper = (upper + 1) % 0x10000
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end
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val = upper
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end
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return val
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end
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function Dumper:validate(n, bits)
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local max = 2^bits
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if n == nil then
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self:error('value is nil') -- internal error?
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end
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if n > max or n < 0 then
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self:error('value out of range')
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end
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end
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function Dumper:valvar(t, bits)
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local val = self:toval(t)
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self:validate(val, bits)
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return val
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end
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function Dumper:write(t)
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for _, b in ipairs(t) do
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self.writer(self.pos, b)
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self.pos = self.pos + 1
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end
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end
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function Dumper:dump_instruction(t)
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local uw = 0
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local lw = 0
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local o = t[1]
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uw = uw + o*0x400
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if #t == 2 then
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local val = self:valvar(t[2], 26)
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uw = uw + bitrange(val, 16, 25)
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lw = lw + bitrange(val, 0, 15)
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elseif #t == 4 then
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uw = uw + self:valvar(t[2], 5)*0x20
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uw = uw + self:valvar(t[3], 5)
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lw = lw + self:valvar(t[4], 16)
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elseif #t == 6 then
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uw = uw + self:valvar(t[2], 5)*0x20
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uw = uw + self:valvar(t[3], 5)
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lw = lw + self:valvar(t[4], 5)*0x800
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lw = lw + self:valvar(t[5], 5)*0x40
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lw = lw + self:valvar(t[6], 6)
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else
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error('Internal Error: unknown n-size')
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end
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return uw, lw
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end
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function Dumper:dump()
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self.pos = self.options.offset or 0
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for i, t in ipairs(self.commands) do
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assert(t.fn, 'Internal Error: no file name available')
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assert(t.line, 'Internal Error: no line number available')
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self.fn = t.fn
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self.line = t.line
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if t.kind == 'instruction' then
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local uw, lw = self:dump_instruction(t)
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local b0 = bitrange(lw, 0, 7)
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local b1 = bitrange(lw, 8, 15)
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local b2 = bitrange(uw, 0, 7)
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local b3 = bitrange(uw, 8, 15)
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self:write{b3, b2, b1, b0}
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elseif t.kind == 'bytes' then
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self:write(t)
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elseif t.kind == 'goto' then
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self.pos = t.addr
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elseif t.kind == 'ahead' then
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if t.fill then
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for i=1, t.skip do
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self:write{t.fill}
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end
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else
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self.pos = self.pos + t.skip
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end
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elseif t.kind == 'label' then
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local val = self:desym{tt='LABELSYM', tok=t.name}
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val = (val % 0x80000000) + 0x80000000
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local b0 = bitrange(val, 0, 7)
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local b1 = bitrange(val, 8, 15)
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local b2 = bitrange(val, 16, 23)
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local b3 = bitrange(val, 24, 31)
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self:write{b3, b2, b1, b0}
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else
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error('Internal Error: unknown command')
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end
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end
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end
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return Dumper
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