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handle immediates in place of most offsets

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This commit is contained in:
Connor Olding 2015-11-22 13:28:47 -08:00
parent 25b0ade37a
commit e31b73d34e
1 changed files with 31 additions and 1 deletions
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32
Lua/inject/assembler.lua
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@ -898,6 +898,34 @@ function Parser:instruction()
args.immediate = {'LOWER', im}
self:format_out(addi[3], addi[1], args, addi[4], addi[5])
end
elseif h[2] == 'tob' then -- or h[2] == 'Tob' then
local lui = instruction_handlers['LUI']
local args = {}
args.rt = self:register()
self:optional_comma()
local o = self:const()
if o[1] == 'LABELSYM' then
self:error('unimplemented: label as an offset')
end
if self:is_EOL() then
local upper = math.floor(o[2]/0x10000)
local lower = o[2] % 0x10000
if lower >= 0x8000 then
-- accommodate for offsets being signed
upper = (upper + 1) % 0x10000
end
local lui_args = {}
lui_args.immediate = {'NUM', upper}
lui_args.rt = 'AT'
self:format_out(lui[3], lui[1], lui_args, lui[4], lui[5])
args.offset = {'NUM', lower}
args.base = 'AT'
else
args.offset = o
self:optional_comma()
args.base = self:deref()
end
self:format_out(h[3], h[1], args, h[4], h[5])
elseif h[2] ~= nil then
args = self:format_in(h[2])
self:format_out(h[3], h[1], args, h[4], h[5])
@ -961,7 +989,9 @@ function Parser:parse(asm)
self:tokenize()
self:advance()
while true do
if self.tt == 'EOL' then
if self.tt == 'EOF' then
break
elseif self.tt == 'EOL' then
-- empty line
self:advance()
elseif self.tt == 'DEF' then