Zcor3x
36 lines
2.3 KiB
Lua
36 lines
2.3 KiB
Lua
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MipsInsn = {}
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MipsInsn.IsAddi = function(insn) return (insn & 0xfc000000) == 0x20000000 end -- addi rt,rs,simm
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MipsInsn.IsAddiu = function(insn) return (insn & 0xfc000000) == 0x24000000 end -- addiu rt,rs,simm
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MipsInsn.IsDaddu = function(insn) return (insn & 0xfc0007ff) == 0x0000002d end -- daddu rd,rs,rt
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MipsInsn.IsAddu = function(insn) return (insn & 0xfc0007ff) == 0x00000021 end -- addu rd,rs,rt
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MipsInsn.IsBeq = function(insn) return (insn & 0xfc000000) == 0x10000000 end -- beq rs,rt,off
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MipsInsn.IsJ = function(insn) return (insn & 0xfc000000) == 0x08000000 end -- j target
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MipsInsn.IsJal = function(insn) return (insn & 0xfc000000) == 0x0c000000 end -- jal target
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MipsInsn.IsJr = function(insn) return (insn & 0xfc1fffff) == 0x00000008 end -- jr rs
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MipsInsn.IsLq = function(insn) return (insn & 0xfc000000) == 0x78000000 end -- lq rt,simm(rs)
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MipsInsn.IsLd = function(insn) return (insn & 0xfc000000) == 0xdc000000 end -- ld rt,simm(rs)
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MipsInsn.IsLw = function(insn) return (insn & 0xfc000000) == 0x8c000000 end -- lw rt,simm(rs)
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MipsInsn.IsSq = function(insn) return (insn & 0xfc000000) == 0x7c000000 end -- sq rt,simm(rs)
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MipsInsn.IsSd = function(insn) return (insn & 0xfc000000) == 0xfc000000 end -- sd rt,simm(rs)
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MipsInsn.IsSw = function(insn) return (insn & 0xfc000000) == 0xac000000 end -- sw rt,simm(rs)
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MipsInsn.IsEnd = function(insn) return (insn & 0xfc00003f) == 0x0000000d end -- break [code]
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MipsInsn.GetRt = function(insn) return (insn >> 16) & 0x1f end
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MipsInsn.GetRs = function(insn) return (insn >> 21) & 0x1f end
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MipsInsn.GetRd = function(insn) return (insn >> 11) & 0x1f end
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--MipsInsn.GetSimm = function(insn) return ((insn << 48) >> 48) end -- this can't create a negative value correctly
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MipsInsn.GetSimm = function(insn)
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-- Lua5.3 shifts are all logical (WHY!?). threfore (insn<<48)>>48 cannot extend the sign.
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-- Instead of using shift, do following
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local bit = 16 -- sign bit place.
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local v = insn & 0xffff
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local m = 1 << (bit - 1)
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v = v & ((1 << bit) - 1)
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return (v ~ m) - m -- '~' is xor in Lua... how strange it is.
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end
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MipsInsn.GetOff = function(insn) return MipsInsn.GetSimm(insn) end
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MipsInsn.GetTarget = function(insn) return insn & 0x3ffffff end
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return MipsInsn
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