472 lines
18 KiB
Python
472 lines
18 KiB
Python
#!/usr/bin/python3
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import argparse
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from binascii import unhexlify
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from collections import OrderedDict, defaultdict, namedtuple, Counter
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from copy import copy
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from enum import Enum, IntEnum
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from itertools import accumulate, product
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import struct
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from typing import NamedTuple, FrozenSet, List, Tuple, Union, Optional, ByteString
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def bitstruct(name, fields):
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names, sizes = zip(*(field.split(":") for field in fields))
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sizes = tuple(map(int, sizes))
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offsets = (0,) + tuple(accumulate(sizes))
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class __class:
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def __init__(self, **kwargs):
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for name in names:
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setattr(self, name, kwargs.get(name, 0))
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def _encode(self, length):
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enc = 0
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for name, size, offset in zip(names, sizes, offsets):
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enc += (getattr(self, name) & ((1 << size) - 1)) << offset
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return enc.to_bytes(length, "little")
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__class.__name__ = name
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return __class
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InstrFlags = bitstruct("InstrFlags", [
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"modrm_idx:2",
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"modreg_idx:2",
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"vexreg_idx:2",
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"zeroreg_idx:2",
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"imm_idx:2",
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"zeroreg_val:1",
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"lock:1",
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"imm_control:3",
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"vsib:1",
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"op0_size:2",
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"op1_size:2",
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"op2_size:2",
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"op3_size:2",
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"size8:1",
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"sized64:1",
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"size_fix1:3",
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"size_fix2:2",
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"instr_width:1",
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"op0_regty:3",
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"op1_regty:3",
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"op2_regty:3",
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"_unused:7",
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])
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ENCODINGS = {
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"NP": InstrFlags(),
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"M": InstrFlags(modrm_idx=0^3),
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"M1": InstrFlags(modrm_idx=0^3, imm_idx=1^3, imm_control=1),
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"MI": InstrFlags(modrm_idx=0^3, imm_idx=1^3, imm_control=4),
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"MC": InstrFlags(modrm_idx=0^3, zeroreg_idx=1^3, zeroreg_val=1),
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"MR": InstrFlags(modrm_idx=0^3, modreg_idx=1^3),
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"RM": InstrFlags(modrm_idx=1^3, modreg_idx=0^3),
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"RMA": InstrFlags(modrm_idx=1^3, modreg_idx=0^3, zeroreg_idx=2^3),
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"MRI": InstrFlags(modrm_idx=0^3, modreg_idx=1^3, imm_idx=2^3, imm_control=4),
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"RMI": InstrFlags(modrm_idx=1^3, modreg_idx=0^3, imm_idx=2^3, imm_control=4),
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"MRC": InstrFlags(modrm_idx=0^3, modreg_idx=1^3, zeroreg_idx=2^3, zeroreg_val=1),
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"I": InstrFlags(imm_idx=0^3, imm_control=4),
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"IA": InstrFlags(zeroreg_idx=0^3, imm_idx=1^3, imm_control=4),
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"O": InstrFlags(modreg_idx=0^3),
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"OI": InstrFlags(modreg_idx=0^3, imm_idx=1^3, imm_control=4),
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"OA": InstrFlags(modreg_idx=0^3, zeroreg_idx=1^3),
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"AO": InstrFlags(modreg_idx=1^3, zeroreg_idx=0^3),
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"A": InstrFlags(zeroreg_idx=0^3),
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"D": InstrFlags(imm_idx=0^3, imm_control=6),
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"FD": InstrFlags(zeroreg_idx=0^3, imm_idx=1^3, imm_control=2),
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"TD": InstrFlags(zeroreg_idx=1^3, imm_idx=0^3, imm_control=2),
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"RVM": InstrFlags(modrm_idx=2^3, modreg_idx=0^3, vexreg_idx=1^3),
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"RVMI": InstrFlags(modrm_idx=2^3, modreg_idx=0^3, vexreg_idx=1^3, imm_idx=3^3, imm_control=4, imm_byte=1),
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"RVMR": InstrFlags(modrm_idx=2^3, modreg_idx=0^3, vexreg_idx=1^3, imm_idx=3^3, imm_control=3, imm_byte=1),
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"RMV": InstrFlags(modrm_idx=1^3, modreg_idx=0^3, vexreg_idx=2^3),
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"VM": InstrFlags(modrm_idx=1^3, vexreg_idx=0^3),
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"VMI": InstrFlags(modrm_idx=1^3, vexreg_idx=0^3, imm_idx=2^3, imm_control=4, imm_byte=1),
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"MVR": InstrFlags(modrm_idx=0^3, modreg_idx=2^3, vexreg_idx=1^3),
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}
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class OpKind(NamedTuple):
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size: int
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kind: str
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SZ_OP = -1
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SZ_VEC = -2
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K_MEM = "mem"
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K_IMM = "imm"
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OPKINDS = {
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# sizeidx (0, fixedsz, opsz, vecsz), fixedsz (log2), regtype
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"IMM": OpKind(OpKind.SZ_OP, OpKind.K_IMM),
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"IMM8": OpKind(1, OpKind.K_IMM),
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"IMM16": OpKind(2, OpKind.K_IMM),
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"IMM32": OpKind(4, OpKind.K_IMM),
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"GP": OpKind(OpKind.SZ_OP, "GP"),
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"GP8": OpKind(1, "GP"),
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"GP16": OpKind(2, "GP"),
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"GP32": OpKind(4, "GP"),
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"GP64": OpKind(8, "GP"),
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"MMX": OpKind(8, "MMX"),
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"XMM": OpKind(OpKind.SZ_VEC, "XMM"),
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"XMM8": OpKind(1, "XMM"),
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"XMM16": OpKind(2, "XMM"),
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"XMM32": OpKind(4, "XMM"),
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"XMM64": OpKind(8, "XMM"),
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"XMM128": OpKind(16, "XMM"),
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"XMM256": OpKind(32, "XMM"),
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"SREG": OpKind(2, "SEG"),
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"FPU": OpKind(10, "FPU"),
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"MEM": OpKind(OpKind.SZ_OP, OpKind.K_MEM),
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"MEMV": OpKind(OpKind.SZ_VEC, OpKind.K_MEM),
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"MEMZ": OpKind(0, OpKind.K_MEM),
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"MEM8": OpKind(1, OpKind.K_MEM),
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"MEM16": OpKind(2, OpKind.K_MEM),
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"MEM32": OpKind(4, OpKind.K_MEM),
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"MEM64": OpKind(8, OpKind.K_MEM),
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"MEM128": OpKind(16, OpKind.K_MEM),
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"MASK8": OpKind(1, "MASK"),
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"MASK16": OpKind(2, "MASK"),
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"MASK32": OpKind(4, "MASK"),
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"MASK64": OpKind(8, "MASK"),
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"BND": OpKind(0, "BND"),
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"CR": OpKind(0, "CR"),
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"DR": OpKind(0, "DR"),
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}
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class InstrDesc(NamedTuple):
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mnemonic: str
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encoding: str
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operands: Tuple[str, ...]
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flags: FrozenSet[str]
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OPKIND_REGTYS = {"GP": 0, "FPU": 1, "XMM": 2, "MASK": 3, "MMX": 4, "BND": 5}
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OPKIND_SIZES = {
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0: 0, 1: 1, 2: 2, 4: 3, 8: 4, 16: 5, 32: 6, 10: 0,
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OpKind.SZ_OP: -2, OpKind.SZ_VEC: -3,
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}
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@classmethod
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def parse(cls, desc):
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desc = desc.split()
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operands = tuple(OPKINDS[op] for op in desc[1:5] if op != "-")
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return cls(desc[5], desc[0], operands, frozenset(desc[6:]))
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def encode(self):
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flags = copy(ENCODINGS[self.encoding])
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opsz = set(self.OPKIND_SIZES[opkind.size] for opkind in self.operands)
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# Sort fixed sizes encodable in size_fix2 as second element.
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fixed = sorted((x for x in opsz if x >= 0), key=lambda x: 1 <= x <= 4)
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if len(fixed) > 2 or (len(fixed) == 2 and not (1 <= fixed[1] <= 4)):
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raise Exception("invalid fixed operand sizes: %r"%fixed)
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sizes = (fixed + [1, 1])[:2] + [-2, -3] # See operand_sizes in decode.c.
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flags.size_fix1 = sizes[0]
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flags.size_fix2 = sizes[1] - 1
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for i, opkind in enumerate(self.operands):
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sz = self.OPKIND_SIZES[opkind.size]
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reg_type = self.OPKIND_REGTYS.get(opkind.kind, 7)
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setattr(flags, "op%d_size"%i, sizes.index(sz))
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if i < 3:
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setattr(flags, "op%d_regty"%i, reg_type)
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elif reg_type not in (7, 2):
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raise Exception("invalid regty for op 3, must be VEC")
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# Miscellaneous Flags
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if "DEF64" in self.flags: flags.sized64 = 1
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if "SIZE_8" in self.flags: flags.size8 = 1
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if "INSTR_WIDTH" in self.flags: flags.instr_width = 1
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if "LOCK" in self.flags: flags.lock = 1
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if "VSIB" in self.flags: flags.vsib = 1
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if flags.imm_control >= 4:
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imm_op = next(op for op in self.operands if op.kind == OpKind.K_IMM)
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if ("IMM_8" in self.flags or imm_op.size == 1 or
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(imm_op.size == OpKind.SZ_OP and flags.size8)):
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flags.imm_control |= 1
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enc = flags._encode(6)
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enc = tuple(int.from_bytes(enc[i:i+2], "little") for i in range(0, 6, 2))
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# First 2 bytes are the mnemonic, last 6 bytes are the encoding.
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return ("FDI_"+self.mnemonic,) + enc
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class EntryKind(Enum):
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NONE = 0
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INSTR = 1
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TABLE256 = 2
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TABLE8 = 3
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TABLE72 = 4
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TABLE_PREFIX = 5
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TABLE_VEX = 6
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TABLE_PREFIX_REP = 7
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TABLE_ROOT = -1
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class TrieEntry(NamedTuple):
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kind: EntryKind
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items: Tuple[Optional[str]]
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payload: Tuple[Union[int, str]]
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TABLE_LENGTH = {
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EntryKind.TABLE256: 256,
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EntryKind.TABLE8: 8,
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EntryKind.TABLE72: 72,
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EntryKind.TABLE_PREFIX: 4,
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EntryKind.TABLE_VEX: 4,
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EntryKind.TABLE_PREFIX_REP: 4,
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EntryKind.TABLE_ROOT: 8,
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}
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@classmethod
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def table(cls, kind):
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return cls(kind, (None,) * cls.TABLE_LENGTH[kind], ())
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@classmethod
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def instr(cls, payload):
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return cls(EntryKind.INSTR, (), payload)
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@property
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def encode_length(self):
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return len(self.payload) + len(self.items)
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def encode(self, encode_item) -> Tuple[Union[int, str]]:
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enc_items = (encode_item(item) if item else 0 for item in self.items)
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return self.payload + tuple(enc_items)
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def map(self, map_func):
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mapped_items = (map_func(i, v) for i, v in enumerate(self.items))
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return TrieEntry(self.kind, tuple(mapped_items), self.payload)
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def update(self, idx, new_val):
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return self.map(lambda i, v: new_val if i == idx else v)
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import re
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opcode_regex = re.compile(
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r"^(?:(?P<prefixes>(?P<vex>VEX\.)?(?P<legacy>NP|66|F2|F3)\." +
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r"(?:W(?P<rexw>[01]|IG)\.)?(?:L(?P<vexl>[01]|IG)\.)?)" +
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r"|R(?P<repprefix>NP|F2|F3).)?" +
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r"(?P<opcode>(?:[0-9a-f]{2})+)" +
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r"(?P<modrm>//?[0-7]|//[c-f][0-9a-f])?" +
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r"(?P<extended>\+)?$")
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class Opcode(NamedTuple):
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prefix: Union[None, Tuple[bool, str]] # (False, NP/66/F2/F3), (True, NP/F2/F3)
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escape: int # [0, 0f, 0f38, 0f3a]
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opc: int
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opcext: Union[None, Tuple[bool, int]] # (False, T8), (True, T72), None
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extended: bool # Extend opc or opcext, if present
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vex: bool
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vexl: Union[str, None] # 0, 1, IG, None = used, both
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rexw: Union[str, None] # 0, 1, IG, None = used, both
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@classmethod
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def parse(cls, opcode_string):
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match = opcode_regex.match(opcode_string)
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if match is None:
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return None
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opcext = match.group("modrm")
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if opcext:
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is72 = opcext[1] == "/"
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opcext = is72, int(opcext[1 + is72:], 16)
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if match.group("extended") and opcext and not opcext[0]:
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raise Exception("invalid opcode extension: {}".format(opcode_string))
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prefix_strs = match.group("legacy"), match.group("repprefix")
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prefix = prefix_strs[0] or prefix_strs[1]
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if prefix:
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prefix = prefix_strs[1] is not None, ["NP", "66", "F3", "F2"].index(prefix)
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return cls(
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prefix=prefix,
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escape=["", "0f", "0f38", "0f3a"].index(match.group("opcode")[:-2]),
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opc=int(match.group("opcode")[-2:], 16),
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opcext=opcext,
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extended=match.group("extended") is not None,
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vex=match.group("vex") is not None,
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vexl=match.group("vexl"),
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rexw=match.group("rexw"),
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)
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def for_trie(self):
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opcode = []
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opcode.append((EntryKind.TABLE_ROOT, [self.escape | self.vex << 2]))
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opcode.append((EntryKind.TABLE256, [self.opc]))
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if self.opcext:
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opcext_kind = [EntryKind.TABLE8, EntryKind.TABLE72][self.opcext[0]]
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opcext_val = self.opcext[1] - (0 if self.opcext[1] < 8 else 0xb8)
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opcode.append((opcext_kind, [opcext_val]))
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if self.extended:
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last_type, last_indices = opcode[-1]
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opcode[-1] = last_type, [last_indices[0] + i for i in range(8)]
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if self.prefix:
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prefix_kind = [EntryKind.TABLE_PREFIX, EntryKind.TABLE_PREFIX_REP][self.prefix[0]]
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prefix_val = self.prefix[1]
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opcode.append((prefix_kind, [prefix_val]))
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if self.vexl in ("0", "1") or self.rexw in ("0", "1"):
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rexw = {"0": [0], "1": [1<<0], "IG": [0, 1<<0]}[self.rexw or "IG"]
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vexl = {"0": [0], "1": [1<<1], "IG": [0, 1<<1]}[self.vexl or "IG"]
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entries = list(map(sum, product(rexw, vexl)))
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opcode.append((EntryKind.TABLE_VEX, entries))
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kinds, values = zip(*opcode)
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return [tuple(zip(kinds, prod)) for prod in product(*values)]
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def format_opcode(opcode):
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opcode_string = ""
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prefix = ""
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for kind, byte in opcode:
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if kind == EntryKind.TABLE_ROOT:
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opcode_string += ["", "0f", "0f38", "0f3a"][byte & 3]
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prefix += ["", "VEX."][byte >> 2]
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elif kind == EntryKind.TABLE256:
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opcode_string += "{:02x}".format(byte)
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elif kind in (EntryKind.TABLE8, EntryKind.TABLE72):
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opcode_string += "/{:x}".format(byte)
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elif kind == EntryKind.TABLE_PREFIX:
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if byte & 4:
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prefix += "VEX."
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prefix += ["NP.", "66.", "F3.", "F2."][byte&3]
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elif kind == EntryKind.TABLE_PREFIX_REP:
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prefix += ["RNP.", "??.", "RF3.", "RF2."][byte&3]
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elif kind == EntryKind.TABLE_VEX:
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prefix += "W{}.L{}.".format(byte & 1, byte >> 1)
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else:
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raise Exception("unsupported opcode kind {}".format(kind))
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return prefix + opcode_string
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class Table:
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def __init__(self, root_count=1):
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self.data = OrderedDict()
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self.roots = ["root%d"%i for i in range(root_count)]
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for i in range(root_count):
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self.data["root%d"%i] = TrieEntry.table(EntryKind.TABLE_ROOT)
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self.offsets = {}
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self.annotations = {}
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def _update_table(self, name, idx, entry_name, entry_val):
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# Don't override existing entries. This only happens on invalid input,
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# e.g. when an opcode is specified twice.
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if self.data[name].items[idx]:
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raise Exception("{}/{} set, not overriding to {}".format(name, idx, entry_name))
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self.data[entry_name] = entry_val
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self.data[name] = self.data[name].update(idx, entry_name)
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def add_opcode(self, opcode, instr_encoding, root_idx=0):
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name = "t{},{}".format(root_idx, format_opcode(opcode))
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tn = "root%d"%root_idx
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for i in range(len(opcode) - 1):
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# kind is the table kind that we want to point to in the _next_.
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kind, byte = opcode[i+1][0], opcode[i][1]
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# Retain prev_tn name so that we can update it.
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prev_tn, tn = tn, self.data[tn].items[byte]
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if tn is None:
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tn = "t{},{}".format(root_idx, format_opcode(opcode[:i+1]))
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self._update_table(prev_tn, byte, tn, TrieEntry.table(kind))
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if self.data[tn].kind != kind:
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raise Exception("{}, have {}, want {}".format(
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name, self.data[tn].kind, kind))
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self._update_table(tn, opcode[-1][1], name, TrieEntry.instr(instr_encoding))
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def deduplicate(self):
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synonyms = True
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while synonyms:
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entries = {} # Mapping from entry to name
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synonyms = {} # Mapping from name to unique name
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for name, entry in self.data.items():
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if entry in entries:
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synonyms[name] = entries[entry]
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else:
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entries[entry] = name
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for name, entry in self.data.items():
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self.data[name] = entry.map(lambda _, v: synonyms.get(v, v))
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for key in synonyms:
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del self.data[key]
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def calc_offsets(self):
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current = 0
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for name, entry in self.data.items():
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self.annotations[current] = "%s(%d)" % (name, entry.kind.value)
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self.offsets[name] = current
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current += (entry.encode_length + 3) & ~3
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if current >= 0x8000:
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raise Exception("maximum table size exceeded: {:x}".format(current))
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def encode_item(self, name):
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return (self.offsets[name] << 1) | self.data[name].kind.value
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def compile(self):
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self.calc_offsets()
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ordered = sorted((off, self.data[k]) for k, off in self.offsets.items())
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data = ()
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for off, entry in ordered:
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data += (0,) * (off - len(data)) + entry.encode(self.encode_item)
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stats = dict(Counter(entry.kind for entry in self.data.values()))
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print("%d bytes" % (2*len(data)), stats)
|
|
return data, self.annotations, [self.offsets[k] for k in self.roots]
|
|
|
|
def bytes_to_table(data, notes):
|
|
strdata = tuple(d+"," if type(d) == str else "%#04x,"%d for d in data)
|
|
offs = [0] + sorted(notes.keys()) + [len(data)]
|
|
return "\n".join("".join(strdata[p:c]) + "\n//%04x "%c + notes.get(c, "")
|
|
for p, c in zip(offs, offs[1:]))
|
|
|
|
template = """// Auto-generated file -- do not modify!
|
|
#if defined(FD_DECODE_TABLE_DATA)
|
|
{hex_table}
|
|
#elif defined(FD_DECODE_TABLE_STRTAB1)
|
|
{mnemonic_cstr}
|
|
#elif defined(FD_DECODE_TABLE_STRTAB2)
|
|
{mnemonic_offsets}
|
|
#elif defined(FD_DECODE_TABLE_DEFINES)
|
|
{defines}
|
|
#else
|
|
#error "unspecified decode table"
|
|
#endif
|
|
"""
|
|
|
|
if __name__ == "__main__":
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument("--32", dest="modes", action="append_const", const=32)
|
|
parser.add_argument("--64", dest="modes", action="append_const", const=64)
|
|
parser.add_argument("table", type=argparse.FileType('r'))
|
|
parser.add_argument("decode_mnems", type=argparse.FileType('w'))
|
|
parser.add_argument("decode_table", type=argparse.FileType('w'))
|
|
args = parser.parse_args()
|
|
|
|
entries = []
|
|
for line in args.table.read().splitlines():
|
|
if not line or line[0] == "#": continue
|
|
opcode_string, desc = tuple(line.split(maxsplit=1))
|
|
entries.append((Opcode.parse(opcode_string), InstrDesc.parse(desc)))
|
|
|
|
mnemonics = sorted({desc.mnemonic for _, desc in entries})
|
|
mnemonics_lut = {name: mnemonics.index(name) for name in mnemonics}
|
|
|
|
decode_mnems_lines = ["FD_MNEMONIC(%s,%d)"%e for e in mnemonics_lut.items()]
|
|
args.decode_mnems.write("\n".join(decode_mnems_lines))
|
|
|
|
modes = [32, 64]
|
|
table = Table(root_count=len(args.modes))
|
|
for opcode, desc in entries:
|
|
for i, mode in enumerate(args.modes):
|
|
if "ONLY%d"%(96-mode) not in desc.flags:
|
|
for opcode_path in opcode.for_trie():
|
|
table.add_opcode(opcode_path, desc.encode(), i)
|
|
|
|
table.deduplicate()
|
|
table_data, annotations, root_offsets = table.compile()
|
|
|
|
mnemonic_tab = [0]
|
|
for name in mnemonics:
|
|
mnemonic_tab.append(mnemonic_tab[-1] + len(name) + 1)
|
|
mnemonic_cstr = '"' + "\\0".join(mnemonics) + '"'
|
|
|
|
defines = ["FD_TABLE_OFFSET_%d %d"%k for k in zip(args.modes, root_offsets)]
|
|
|
|
decode_table = template.format(
|
|
hex_table=bytes_to_table(table_data, annotations),
|
|
mnemonic_cstr=mnemonic_cstr,
|
|
mnemonic_offsets=",".join(str(off) for off in mnemonic_tab),
|
|
defines="\n".join("#define " + line for line in defines),
|
|
)
|
|
args.decode_table.write(decode_table)
|