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Fix decompilation of MIPS ins instruction

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Simplify ext instruction
This commit is contained in:
kotcrab
2021-09-07 17:49:42 +02:00
parent c51183f1a2
commit 3ad11a8a36
1 changed files with 3 additions and 9 deletions
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12
Ghidra/Processors/MIPS/data/languages/mips32Instructions.sinc
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@@ -205,21 +205,15 @@ define pcodeop special2;
# Extract Bit Field
# RT = extractField(RSsrc, msbd:1, lsb:1);
# Note that msbd = size - 1
@if REGSIZE == "4"
rs_tmp:4 = RSsrc << (32 - (msbd + lsb + 1));
rs_tmp = rs_tmp >> (32 - (msbd + 1));
rs_tmp:$(REGSIZE) = RSsrc << ($(REGSIZE) * 8 - (msbd + lsb + 1));
rs_tmp = rs_tmp >> ($(REGSIZE) * 8 - (msbd + 1));
RT = zext(rs_tmp);
@else
rs_tmp:8 = RSsrc << (64 - (msbd + lsb + 1));
rs_tmp = rs_tmp >> (64 - (msbd + 1));
RT = zext(rs_tmp);
@endif
}
# 0111 11ss ssst tttt mmmm mLLL LL00 0100
:ins RT, RSsrc, lsb, InsSize is $(AMODE) & prime=0x1F & fct=0x04 & RT & RTsrc & RSsrc & lsb & msbd & InsSize {
tmpa:$(REGSIZE) = -1;
tmpa = tmpa >> ($(REGSIZE) - InsSize);
tmpa = tmpa >> ($(REGSIZE) * 8 - InsSize);
tmpb:$(REGSIZE) = RSsrc & tmpa;
tmpa = tmpa << lsb;
tmpa = ~tmpa;