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allow signed constants for some instructions

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Connor Olding 2015-11-26 21:38:08 -08:00
parent 975ff3f942
commit 63851234f9
1 changed files with 23 additions and 11 deletions
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34
lips.lua
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@ -114,6 +114,7 @@ local instructions = {
I: constant or label for index (long jump)
i: immediate (must fit in a halfword; cannot be a label)
k: immediate to negate (must fit in a halfword; cannot be a label)
K: signed immediate (-0x8000 <= immediate < 0x10000; cannot be a label)
output format guide:
such and such: writes ... at this position
@ -175,11 +176,11 @@ local instructions = {
MFHI = {0, 'd', '00d0C', 16},
MFLO = {0, 'd', '00d0C', 18},
ADDI = { 8, 'tsi', 'sti'},
ADDIU = { 9, 'tsi', 'sti'},
ANDI = {12, 'tsi', 'sti'},
DADDI = {24, 'tsi', 'sti'},
DADDIU = {25, 'tsi', 'sti'},
ADDI = { 8, 'tsK', 'sti'},
ADDIU = { 9, 'tsK', 'sti'},
ANDI = {12, 'tsK', 'sti'},
DADDI = {24, 'tsK', 'sti'},
DADDIU = {25, 'tsK', 'sti'},
ORI = {13, 'tsi', 'sti'},
SLTI = {10, 'tsi', 'sti'},
SLTIU = {11, 'tsi', 'sti'},
@ -892,21 +893,23 @@ function Parser:format_in(informat)
elseif c == 'T' and not args.ft then
args.ft = self:register(fpu_registers)
elseif c == 'o' and not args.offset then
args.offset = self:const()
args.offset = {'SIGNED', self:const()}
elseif c == 'r' and not args.offset then
args.offset = self:const('relative')
args.offset = {'SIGNED', self:const('relative')}
elseif c == 'i' and not args.immediate then
args.immediate = self:const(nil, 'no label')
elseif c == 'I' and not args.index then
args.index = {'INDEX', self:const()}
elseif c == 'k' and not args.immediate then
args.immediate = {'NEGATE', self:const()}
args.immediate = {'NEGATE', self:const(nil, 'no label')}
elseif c == 'K' and not args.immediate then
args.immediate = {'SIGNED', self:const(nil, 'no label')}
elseif c == 'b' and not args.base then
args.base = self:deref()
else
error('Internal Error: invalid input formatting string', 1)
end
if c2:find('[dstDSTorIik]') then
if c2:find('[dstDSTorIikK]') then
self:optional_comma()
end
end
@ -1115,7 +1118,7 @@ function Parser:instruction()
if is_label then
self:error('labels cannot be used as offsets')
end
args.offset = o
args.offset = {'SIGNED', o}
self:optional_comma()
args.base = self:deref()
end
@ -1331,7 +1334,7 @@ function Dumper:desym(tok)
if rel > 0x8000 or rel <= -0x8000 then
self:error('branch too far')
end
return (0x10000 + rel) % 0x10000
return rel % 0x10000
end
self:error('failed to desym')
end
@ -1363,8 +1366,17 @@ function Dumper:toval(tok)
upper = (upper + 1) % 0x10000
end
return upper
elseif tok[1] == 'SIGNED' then
local val = self:desym(tok[2])
if val >= 0x10000 or val < -0x8000 then
self:error('value out of range')
end
return val % 0x10000
elseif tok[1] == 'NEGATE' then
local val = -self:desym(tok[2])
if val >= 0x10000 or val < -0x8000 then
self:error('value out of range')
end
return val % 0x10000
elseif tok[1] == 'INDEX' then
local val = self:desym(tok[2]) % 0x80000000