mykola/Parsable-Instructions
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now I can definitely tell if instruction has ModRM byte or no

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mykola2312 2024-08-01 02:37:08 +03:00
parent 5998950f23
commit a681a53ff3
2 changed files with 24 additions and 8 deletions
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31
genc.py
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@ -25,14 +25,29 @@ class Instruction:
value = Instruction.VALUE_REGEX.search(opc) value = Instruction.VALUE_REGEX.search(opc)
opreg = Instruction.OPREG_REGEX.search(opc) opreg = Instruction.OPREG_REGEX.search(opc)
print(ins.find("mnem").text) self.mnemonic = ins.find("mnem").text
if rex: print("rex\t", rex.group(1)) self.bytes = bytes
print(bytes)
if digit: print("digit\t", digit.group(1)) self.rex = None
if modrm: print("modrm\t", modrm.group(0)) self.digit = None
if imm: print("imm\t", imm.group(1)) self.modrm = False
if value: print("value\t", value.group(1)) self.imm = None
if opreg: print("opreg\t", opreg.group(1)) self.value = None
self.opreg = None
if rex: self.rex = rex.group(1)
if digit: self.digit = int(digit.group(1))
if modrm: self.modrm = True
if imm: self.imm = imm.group(1)
if value: self.value = value.group(1)
if opreg: self.opreg = opreg.group(1)
self.has_modrm = self.modrm or self.digit is not None
print(self)
def __str__(self):
return f"{self.mnemonic} rex {self.rex} bytes {self.bytes} has_modrm {self.has_modrm} digit {self.digit} modrm {self.modrm} imm {self.imm} value {self.value} opreg {self.opreg}"
class InstructionGroup: class InstructionGroup:
def __init__(self, common): def __init__(self, common):

1
plan.txt
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@ -1,4 +1,5 @@
The Intel OpCode Syntax can tell if there is ModRM byte, as well as if registers are encoded directly in opcode (rb for example), The Intel OpCode Syntax can tell if there is ModRM byte, as well as if registers are encoded directly in opcode (rb for example),
and can tell size of immediate (ib iw id for example). The /digit can also indiciate presense of ModRM. and can tell size of immediate (ib iw id for example). The /digit can also indiciate presense of ModRM.
The size of displacement is also dictated by cw/cd. The size of displacement is also dictated by cw/cd.
ModRM also can tell if there is SIB byte or no.
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