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add PUSH and POP pseudo-instructions

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This commit is contained in:
Connor Olding 2015-12-17 08:41:59 -08:00
parent b60ca90873
commit dc4dac8138
1 changed files with 42 additions and 0 deletions
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42
lips.lua
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@ -388,6 +388,10 @@ local instructions = {
LI = 'LI', -- only one instruction for values < 0x10000
LA = 'LA',
-- variable arguments
PUSH = 'PUSH',
POP = 'POP',
ABS = {}, -- BGEZ NOP SUB?
MUL = {}, -- MULT MFLO
--DIV = {}, -- 3 arguments
@ -1025,6 +1029,44 @@ function Parser:instruction()
self:format_out(lui[3], lui[1], args, lui[4], lui[5])
args.immediate = {'LOWER', im}
self:format_out(addiu[3], addiu[1], args, addiu[4], addiu[5])
elseif h == 'PUSH' or h == 'POP' then
local addi = instructions['ADDI']
local w = instructions[h == 'PUSH' and 'SW' or 'LW']
local registers = {}
while not self:is_EOL() do
local r = self:register()
table.insert(registers, r)
if not self:is_EOL() then
self:optional_comma()
end
end
if #registers == 0 then
self:error(h..' requires at least one argument')
end
if #registers >= 0x8000/4 then
self:error("that's way too many registers bub")
end
local args = {}
if h == 'PUSH' then
args.rt = 'SP'
args.rs = 'SP'
args.immediate = {'NEGATE', {'NUM', #registers*4}}
self:format_out(addi[3], addi[1], args, addi[4], addi[5])
end
args.base = 'SP'
for i, r in ipairs(registers) do
args.rt = r
if r ~= 'R0' then
args.offset = {'NUM', (i - 1)*4}
self:format_out(w[3], w[1], args, w[4], w[5])
end
end
if h == 'POP' then
args.rt = 'SP'
args.rs = 'SP'
args.immediate = {'NUM', #registers*4}
self:format_out(addi[3], addi[1], args, addi[4], addi[5])
end
elseif h == 'NAND' then
local and_ = instructions['AND']
local nor = instructions['NOR']