mirror of
https://github.com/notwa/lips
synced 2024-05-18 08:23:23 -07:00
319 lines
8.2 KiB
Lua
319 lines
8.2 KiB
Lua
local insert = table.insert
|
|
|
|
local data = require "lips.data"
|
|
local instructions = data.instructions
|
|
|
|
local overrides = {}
|
|
-- note: "self" is an instance of Parser
|
|
|
|
function overrides.LI(self, name)
|
|
local lui = instructions['LUI']
|
|
local ori = instructions['ORI']
|
|
local addiu = instructions['ADDIU']
|
|
local args = {}
|
|
args.rt = self:register()
|
|
self:optional_comma()
|
|
local im = self:const()
|
|
|
|
-- for us, this is just semantics. for a "real" assembler,
|
|
-- LA could add appropriate RELO LUI/ADDIU directives.
|
|
if im[1] == 'LABELSYM' then
|
|
self:error('use LA for labels')
|
|
end
|
|
|
|
im[2] = im[2] % 0x100000000
|
|
if im[2] >= 0x10000 and im[2] <= 0xFFFF8000 then
|
|
args.rs = args.rt
|
|
args.immediate = {'UPPER', im}
|
|
self:format_out(lui, args)
|
|
if im[2] % 0x10000 ~= 0 then
|
|
args.immediate = {'LOWER', im}
|
|
self:format_out(ori, args)
|
|
end
|
|
elseif im[2] >= 0x8000 and im[2] < 0x10000 then
|
|
args.rs = 'R0'
|
|
args.immediate = {'LOWER', im}
|
|
self:format_out(ori, args)
|
|
else
|
|
args.rs = 'R0'
|
|
args.immediate = {'LOWER', im}
|
|
self:format_out(addiu, args)
|
|
end
|
|
end
|
|
|
|
function overrides.LA(self, name)
|
|
local lui = instructions['LUI']
|
|
local addiu = instructions['ADDIU']
|
|
local args = {}
|
|
args.rt = self:register()
|
|
self:optional_comma()
|
|
local im = self:const()
|
|
|
|
args.rs = args.rt
|
|
args.immediate = {'UPPEROFF', im}
|
|
self:format_out(lui, args)
|
|
args.immediate = {'LOWER', im}
|
|
self:format_out(addiu, args)
|
|
end
|
|
|
|
function overrides.PUSH(self, name)
|
|
local addi = instructions['ADDI']
|
|
local w = instructions[name == 'PUSH' and 'SW' or 'LW']
|
|
local jr = instructions['JR']
|
|
local stack = {}
|
|
while not self:is_EOL() do
|
|
if self.tt == 'NUM' then
|
|
if self.tok < 0 then
|
|
self:error("can't push a negative number of spaces")
|
|
end
|
|
for i=1,self.tok do
|
|
insert(stack, '')
|
|
end
|
|
self:advance()
|
|
else
|
|
insert(stack, self:register())
|
|
end
|
|
if not self:is_EOL() then
|
|
self:optional_comma()
|
|
end
|
|
end
|
|
if #stack == 0 then
|
|
self:error(name..' requires at least one argument')
|
|
end
|
|
local args = {}
|
|
if name == 'PUSH' then
|
|
args.rt = 'SP'
|
|
args.rs = 'SP'
|
|
args.immediate = {'NEGATE', {'NUM', #stack*4}}
|
|
self:format_out(addi, args)
|
|
end
|
|
args.base = 'SP'
|
|
for i, r in ipairs(stack) do
|
|
args.rt = r
|
|
if r ~= '' then
|
|
args.offset = {'NUM', (i - 1)*4}
|
|
self:format_out(w, args)
|
|
end
|
|
end
|
|
if name == 'JPOP' then
|
|
args.rs = 'RA'
|
|
self:format_out(jr, args)
|
|
end
|
|
if name == 'POP' or name == 'JPOP' then
|
|
args.rt = 'SP'
|
|
args.rs = 'SP'
|
|
args.immediate = {'NUM', #stack*4}
|
|
self:format_out(addi, args)
|
|
end
|
|
end
|
|
overrides.POP = overrides.PUSH
|
|
overrides.JPOP = overrides.PUSH
|
|
|
|
function overrides.NAND(self, name)
|
|
local and_ = instructions['AND']
|
|
local nor = instructions['NOR']
|
|
local args = {}
|
|
args.rd = self:register()
|
|
self:optional_comma()
|
|
args.rs = self:register()
|
|
self:optional_comma()
|
|
args.rt = self:register()
|
|
self:format_out(and_, args)
|
|
args.rs = args.rd
|
|
args.rt = 'R0'
|
|
self:format_out(nor, args)
|
|
end
|
|
|
|
function overrides.NANDI(self, name)
|
|
local andi = instructions['ANDI']
|
|
local nor = instructions['NOR']
|
|
local args = {}
|
|
args.rt = self:register()
|
|
self:optional_comma()
|
|
args.rs = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
self:format_out(andi[3], andi[1], args, andi[4], andi[5])
|
|
args.rd = args.rt
|
|
args.rs = args.rt
|
|
args.rt = 'R0'
|
|
self:format_out(nor[3], nor[1], args, nor[4], nor[5])
|
|
end
|
|
|
|
function overrides.NORI(self, name)
|
|
local ori = instructions['ORI']
|
|
local nor = instructions['NOR']
|
|
local args = {}
|
|
args.rt = self:register()
|
|
self:optional_comma()
|
|
args.rs = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
self:format_out(ori, args)
|
|
args.rd = args.rt
|
|
args.rs = args.rt
|
|
args.rt = 'R0'
|
|
self:format_out(nor, args)
|
|
end
|
|
|
|
function overrides.ROL(self, name)
|
|
local sll = instructions['SLL']
|
|
local srl = instructions['SRL']
|
|
local or_ = instructions['OR']
|
|
local args = {}
|
|
local left = self:register()
|
|
self:optional_comma()
|
|
args.rt = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
args.rd = left
|
|
if args.rd == 'AT' or args.rt == 'AT' then
|
|
self:error('registers cannot be AT in this pseudo-instruction')
|
|
end
|
|
if args.rd == args.rt and args.rd ~= 'R0' then
|
|
self:error('registers cannot be the same')
|
|
end
|
|
self:format_out(sll, args)
|
|
args.rd = 'AT'
|
|
args.immediate = {'NUM', 32 - args.immediate[2]}
|
|
self:format_out(srl, args)
|
|
args.rd = left
|
|
args.rs = left
|
|
args.rt = 'AT'
|
|
self:format_out(or_, args)
|
|
end
|
|
|
|
function overrides.ROR(self, name)
|
|
local sll = instructions['SLL']
|
|
local srl = instructions['SRL']
|
|
local or_ = instructions['OR']
|
|
local args = {}
|
|
local right = self:register()
|
|
self:optional_comma()
|
|
args.rt = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
args.rd = right
|
|
if args.rt == 'AT' or args.rd == 'AT' then
|
|
self:error('registers cannot be AT in a pseudo-instruction that uses AT')
|
|
end
|
|
if args.rd == args.rt and args.rd ~= 'R0' then
|
|
self:error('registers cannot be the same')
|
|
end
|
|
self:format_out(srl, args)
|
|
args.rd = 'AT'
|
|
args.immediate = {'NUM', 32 - args.immediate[2]}
|
|
self:format_out(sll, args)
|
|
args.rd = right
|
|
args.rs = right
|
|
args.rt = 'AT'
|
|
self:format_out(or_, args)
|
|
end
|
|
|
|
function overrides.JR(self, name)
|
|
local jr = instructions['JR']
|
|
local args = {}
|
|
if self:is_EOL() then
|
|
args.rs = 'RA'
|
|
else
|
|
args.rs = self:register()
|
|
end
|
|
self:format_out(jr, args)
|
|
end
|
|
|
|
local branch_basics = {
|
|
BEQI = "BEQ",
|
|
BGEI = "BEQ",
|
|
BGTI = "BEQ",
|
|
BLEI = "BNE",
|
|
BLTI = "BNE",
|
|
BNEI = "BNE",
|
|
}
|
|
|
|
function overrides.BEQI(self, name)
|
|
local addiu = instructions['ADDIU']
|
|
local branch = instructions[branch_basics[name]]
|
|
local args = {}
|
|
local reg = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
self:optional_comma()
|
|
args.offset = {'SIGNED', self:const('relative')}
|
|
|
|
if reg == 'AT' then
|
|
self:error('register cannot be AT in this pseudo-instruction')
|
|
end
|
|
|
|
args.rt = 'AT'
|
|
args.rs = 'R0'
|
|
self:format_out(addiu, args)
|
|
|
|
args.rs = reg
|
|
self:format_out(branch, args)
|
|
end
|
|
overrides.BNEI = overrides.BEQI
|
|
|
|
function overrides.BLTI(self, name)
|
|
local slti = instructions['SLTI']
|
|
local branch = instructions[branch_basics[name]]
|
|
local args = {}
|
|
args.rs = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
self:optional_comma()
|
|
args.offset = {'SIGNED', self:const('relative')}
|
|
|
|
if args.rs == 'AT' then
|
|
self:error('register cannot be AT in this pseudo-instruction')
|
|
end
|
|
|
|
args.rt = 'AT'
|
|
self:format_out(slti, args)
|
|
|
|
args.rs = 'AT'
|
|
args.rt = 'R0'
|
|
self:format_out(branch, args)
|
|
end
|
|
overrides.BGEI = overrides.BLTI
|
|
|
|
function overrides.BLEI(self, name)
|
|
-- TODO: this can probably be optimized
|
|
local addiu = instructions['ADDIU']
|
|
local slt = instructions['SLT']
|
|
local branch = instructions[branch_basics[name]]
|
|
local beq = instructions['BEQ']
|
|
local args = {}
|
|
local reg = self:register()
|
|
self:optional_comma()
|
|
args.immediate = self:const()
|
|
self:optional_comma()
|
|
local offset = {'SIGNED', self:const('relative')}
|
|
|
|
if reg == 'AT' then
|
|
self:error('register cannot be AT in this pseudo-instruction')
|
|
end
|
|
|
|
args.rt = 'AT'
|
|
args.rs = 'R0'
|
|
self:format_out(addiu, args)
|
|
|
|
if name == 'BLEI' then
|
|
args.offset = offset
|
|
else
|
|
args.offset = 2 -- branch to delay slot of the next branch
|
|
end
|
|
args.rs = reg
|
|
self:format_out(beq, args)
|
|
|
|
args.rd = 'AT'
|
|
self:format_out(slt, args)
|
|
|
|
args.rs = 'AT'
|
|
args.rt = 'R0'
|
|
args.offset = offset
|
|
self:format_out(branch, args)
|
|
end
|
|
overrides.BGTI = overrides.BLEI
|
|
|
|
return overrides
|