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instrs: Check SREG validity using modreg table

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This commit is contained in:
Alexis Engelke
2020-11-29 11:53:06 +01:00
parent 13e7e27640
commit aa1a39bd9d
3 changed files with 14 additions and 7 deletions
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6
decode.c
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@@ -89,11 +89,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, FdInstr* instr,
reg_idx += prefixes & PREFIX_REXR ? 8 : 0;
#endif
if (is_seg && reg_idx >= 6)
return FD_ERR_UD;
else if (UNLIKELY(instr->type == FDI_MOV_G2S) && reg_idx == 1)
return FD_ERR_UD;
else if (is_cr && (~0x011d >> reg_idx) & 1)
if (is_cr && (~0x011d >> reg_idx) & 1)
return FD_ERR_UD;
else if (is_dr && reg_idx >= 8)
return FD_ERR_UD;