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Fix x86 real mode CS calculation #8521

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Fix x86 real mode CS calculation #8521

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10 changes: 5 additions & 5 deletions Ghidra/Processors/x86/data/languages/ia.sinc
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Original file line number Diff line number Diff line change
Expand Up @@ -1104,7 +1104,7 @@ addr64: [Base64 + Index64*ss + simm32_64] is mod=2 & r_m=4; Index64 & Base64 & s
addr64: [Base64 + Index64*ss] is mod=2 & r_m=4; Index64 & Base64 & ss; imm32=0 { local tmp=Base64+Index64*ss; export tmp; }
@endif

currentCS: CS is protectedMode=0 & CS { tmp:4 = (inst_next >> 4) & 0xf000; CS = tmp:2; export CS; }
currentCS: CS is protectedMode=0 & CS { export CS; }
currentCS: CS is protectedMode=1 & CS { tmp:4 = (inst_next >> 16) & 0xffff; CS = tmp:2; export CS; }

segWide: is segover=0 { export 0:$(SIZE); }
Expand Down Expand Up @@ -2980,10 +2980,10 @@ with : lockprefx=0 {
@endif

# direct far calls generate an opcode undefined exception in x86-64
:CALLF ptr1616 is vexMode=0 & addrsize=0 & opsize=0 & byte=0x9a; ptr1616 { push22(CS); build ptr1616; push22(&:2 inst_next); call ptr1616; }
:CALLF ptr1616 is vexMode=0 & addrsize=1 & opsize=0 & byte=0x9a; ptr1616 { push42(CS); build ptr1616; push42(&:2 inst_next); call ptr1616; }
:CALLF ptr1632 is vexMode=0 & addrsize=0 & opsize=1 & byte=0x9a; ptr1632 { push22(CS); build ptr1632; push24(&:4 inst_next); call ptr1632; }
:CALLF ptr1632 is vexMode=0 & addrsize=1 & opsize=1 & byte=0x9a; ptr1632 { pushseg44(CS); build ptr1632; push44(&:4 inst_next); call ptr1632; }
:CALLF ptr1616 is vexMode=0 & addrsize=0 & opsize=0 & byte=0x9a; ptr1616 { tmp:2 = CS; push22(CS); build ptr1616; push22(&:2 inst_next); call ptr1616; CS = tmp; }
:CALLF ptr1616 is vexMode=0 & addrsize=1 & opsize=0 & byte=0x9a; ptr1616 { tmp:2 = CS; push42(CS); build ptr1616; push42(&:2 inst_next); call ptr1616; CS = tmp; }
:CALLF ptr1632 is vexMode=0 & addrsize=0 & opsize=1 & byte=0x9a; ptr1632 { tmp:2 = CS; push22(CS); build ptr1632; push24(&:4 inst_next); call ptr1632; CS = tmp; }
:CALLF ptr1632 is vexMode=0 & addrsize=1 & opsize=1 & byte=0x9a; ptr1632 { tmp:2 = CS; pushseg44(CS); build ptr1632; push44(&:4 inst_next); call ptr1632; CS = tmp; }
:CALLF addr16 is vexMode=0 & addrsize=0 & opsize=0 & byte=0xff; addr16 & reg_opcode=3 ... { local ptr:$(SIZE) = segment(DS,addr16); local addrptr:$(SIZE) = segment(*:2 (ptr+2),*:2 ptr);
push22(CS); push22(&:2 inst_next); call [addrptr]; }
:CALLF addr32 is vexMode=0 & addrsize=1 & opsize=0 & byte=0xff; addr32 & reg_opcode=3 ... { local dest:4 = addr32; push42(CS); push42(&:2 inst_next); call [dest]; }
Expand Down