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update on plan

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mykola2312 2024-08-01 00:33:01 +03:00
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Just parse all prefixes and skip them, but some of the prefixes like 0x66 can dictate size of immediate The Intel OpCode Syntax can tell if there is ModRM byte, as well as if registers is being encoded in opcode (rb for example),
"args" parser field would tell if instruction has immediate and what type it could be, and can tell size of immediate (ib iw id for example). The /digit can also indiciate presense of ModRM.
while "op_enc" dictates presense of ModRM, and ModRM tells if instruction has SIB byte. The size of displacement is also dictated by cw/cd.
Decode VEX prefixes. 0xC5 for 3-byte VEX and 0xC4 for 2-byte prefix VEX prefixes. 0xC5 for 3-byte VEX and 0xC4 for 2-byte prefix