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implement relative branches; fix register orders

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This commit is contained in:
Connor Olding 2015-11-20 15:01:04 -08:00
parent 1b689368d8
commit 8e9ffba103
1 changed files with 17 additions and 8 deletions
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25
Lua/inject/assembler.lua
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@ -681,10 +681,13 @@ function Parser:deref()
return reg
end
function Parser:const()
function Parser:const(relative)
if self.tt ~= 'NUM' and self.tt ~= 'DEFSYM' and self.tt ~= 'LABELSYM' then
self:error('expected constant')
end
if relative and self.tt == 'LABELSYM' then
self.tt = 'LABELREL'
end
local t = {self.tt, self.tok}
self:advance()
return t
@ -713,10 +716,10 @@ function Parser:instruction()
Dumper:add_instruction_5_5_16(h[1], base, ft, offset)
elseif h[2] == argtypes.sti then
-- OP rt, rs, immediate
local rs = self:register()
self:optional_comma()
local rt = self:register()
self:optional_comma()
local rs = self:register()
self:optional_comma()
local immediate = {'LOWER', self:const()}
Dumper:add_instruction_5_5_16(h[1], rs, rt, immediate)
elseif h[2] == argtypes.std then
@ -761,7 +764,7 @@ function Parser:instruction()
self:optional_comma()
local rt = self:register()
self:optional_comma()
local offset = self:const()
local offset = self:const('relative')
Dumper:add_instruction_5_5_16(h[1], rs, rt, offset)
elseif h[2] == argtypes.stc then
-- OP TEQ rs, rt
@ -777,9 +780,8 @@ function Parser:instruction()
-- OP rs, offset
local rs = self:register()
self:optional_comma()
local offset = self:const()
local offset = self:const('relative')
local const = h[3] or self:error('internal error: expected const')
-- FIXME: branches are relative
Dumper:add_instruction_5_5_16(h[1], rs, const, offset)
elseif h[2] == argtypes.sync then
-- OP
@ -833,7 +835,7 @@ function Parser:instruction()
self:optional_comma()
local ft = self:register(fpu_registers)
local const = h[3] or self:error('internal error: expected const')
Dumper:add_instruction_5_5_5_5_6(h[1], 16, fd, fs, ft, const)
Dumper:add_instruction_5_5_5_5_6(h[1], 16, ft, fs, fd, const)
elseif h[2] == argtypes.tsdd then
local fd = self:register(fpu_registers)
self:optional_comma()
@ -841,7 +843,7 @@ function Parser:instruction()
self:optional_comma()
local ft = self:register(fpu_registers)
local const = h[3] or self:error('internal error: expected const')
Dumper:add_instruction_5_5_5_5_6(h[1], 17, fd, fs, ft, const)
Dumper:add_instruction_5_5_5_5_6(h[1], 17, ft, fs, fd, const)
else
self:error('TODO')
end
@ -945,6 +947,12 @@ function Dumper:desym(tok)
elseif tok[1] == 'LABELSYM' then
--print('(label)', tok[2])
return self.labels[tok[2]]*4
elseif tok[1] == 'LABELREL' then
local rel = self.labels[tok[2]] - 2 - self.line
if rel > 0x8000 or rel <= -0x8000 then
self:error('branch too far')
end
return (0x10000 + rel) % 0x10000
elseif tok[1] == 'DEFSYM' then
--print('(define)')
local val = self.defines[tok[2]]
@ -1016,6 +1024,7 @@ end
function Dumper:dump()
for i, t in ipairs(self.lines) do
self.line = i
local uw = 0
local lw = 0
local val = nil