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Ignore ES/CS/SS/DS segment overrides in x64 mode #2819

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Ignore ES/CS/SS/DS segment overrides in x64 mode #2819

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16 changes: 12 additions & 4 deletions arch/X86/X86DisassemblerDecoder.c
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Original file line number Diff line number Diff line change
Expand Up @@ -523,19 +523,27 @@ static int readPrefixes(struct InternalInstruction *insn)
case 0x65: /* GS segment override */
switch (byte) {
case 0x2e:
insn->segmentOverride = SEG_OVERRIDE_CS;
if (insn->mode != MODE_64BIT) {
insn->segmentOverride = SEG_OVERRIDE_CS;
}
insn->prefix1 = byte;
break;
case 0x36:
insn->segmentOverride = SEG_OVERRIDE_SS;
if (insn->mode != MODE_64BIT) {
insn->segmentOverride = SEG_OVERRIDE_SS;
}
insn->prefix1 = byte;
break;
case 0x3e:
insn->segmentOverride = SEG_OVERRIDE_DS;
if (insn->mode != MODE_64BIT) {
insn->segmentOverride = SEG_OVERRIDE_DS;
}
insn->prefix1 = byte;
break;
case 0x26:
insn->segmentOverride = SEG_OVERRIDE_ES;
if (insn->mode != MODE_64BIT) {
insn->segmentOverride = SEG_OVERRIDE_ES;
}
insn->prefix1 = byte;
break;
case 0x64:
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