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from miasm.core.utils import size2mask
from miasm.expression.expression import ExprInt, ExprCond, ExprCompose, \
TOK_EQUAL
def simp_ext(_, expr):
if expr.op.startswith('zeroExt_'):
arg = expr.args[0]
if expr.size == arg.size:
return arg
return ExprCompose(arg, ExprInt(0, expr.size - arg.size))
if expr.op.startswith("signExt_"):
arg = expr.args[0]
add_size = expr.size - arg.size
new_expr = ExprCompose(
arg,
ExprCond(
arg.msb(),
ExprInt(size2mask(add_size), add_size),
ExprInt(0, add_size)
)
)
return new_expr
return expr
def simp_flags(_, expr):
args = expr.args
if expr.is_op("FLAG_EQ"):
return ExprCond(args[0], ExprInt(0, 1), ExprInt(1, 1))
elif expr.is_op("FLAG_EQ_AND"):
op1, op2 = args
return ExprCond(op1 & op2, ExprInt(0, 1), ExprInt(1, 1))
elif expr.is_op("FLAG_SIGN_SUB"):
return (args[0] - args[1]).msb()
elif expr.is_op("FLAG_EQ_CMP"):
return ExprCond(
args[0] - args[1],
ExprInt(0, 1),
ExprInt(1, 1),
)
elif expr.is_op("FLAG_ADD_CF"):
op1, op2 = args
res = op1 + op2
return (((op1 ^ op2) ^ res) ^ ((op1 ^ res) & (~(op1 ^ op2)))).msb()
elif expr.is_op("FLAG_SUB_CF"):
op1, op2 = args
res = op1 - op2
return (((op1 ^ op2) ^ res) ^ ((op1 ^ res) & (op1 ^ op2))).msb()
elif expr.is_op("FLAG_ADD_OF"):
op1, op2 = args
res = op1 + op2
return (((op1 ^ res) & (~(op1 ^ op2)))).msb()
elif expr.is_op("FLAG_SUB_OF"):
op1, op2 = args
res = op1 - op2
return (((op1 ^ res) & (op1 ^ op2))).msb()
elif expr.is_op("FLAG_EQ_ADDWC"):
op1, op2, op3 = args
return ExprCond(
op1 + op2 + op3.zeroExtend(op1.size),
ExprInt(0, 1),
ExprInt(1, 1),
)
elif expr.is_op("FLAG_ADDWC_OF"):
op1, op2, op3 = args
res = op1 + op2 + op3.zeroExtend(op1.size)
return (((op1 ^ res) & (~(op1 ^ op2)))).msb()
elif expr.is_op("FLAG_SUBWC_OF"):
op1, op2, op3 = args
res = op1 - (op2 + op3.zeroExtend(op1.size))
return (((op1 ^ res) & (op1 ^ op2))).msb()
elif expr.is_op("FLAG_ADDWC_CF"):
op1, op2, op3 = args
res = op1 + op2 + op3.zeroExtend(op1.size)
return (((op1 ^ op2) ^ res) ^ ((op1 ^ res) & (~(op1 ^ op2)))).msb()
elif expr.is_op("FLAG_SUBWC_CF"):
op1, op2, op3 = args
res = op1 - (op2 + op3.zeroExtend(op1.size))
return (((op1 ^ op2) ^ res) ^ ((op1 ^ res) & (op1 ^ op2))).msb()
elif expr.is_op("FLAG_SIGN_ADDWC"):
op1, op2, op3 = args
return (op1 + op2 + op3.zeroExtend(op1.size)).msb()
elif expr.is_op("FLAG_SIGN_SUBWC"):
op1, op2, op3 = args
return (op1 - (op2 + op3.zeroExtend(op1.size))).msb()
elif expr.is_op("FLAG_EQ_SUBWC"):
op1, op2, op3 = args
res = op1 - (op2 + op3.zeroExtend(op1.size))
return ExprCond(res, ExprInt(0, 1), ExprInt(1, 1))
elif expr.is_op("CC_U<="):
op_cf, op_zf = args
return op_cf | op_zf
elif expr.is_op("CC_U>="):
op_cf, = args
return ~op_cf
elif expr.is_op("CC_S<"):
op_nf, op_of = args
return op_nf ^ op_of
elif expr.is_op("CC_S>"):
op_nf, op_of, op_zf = args
return ~(op_zf | (op_nf ^ op_of))
elif expr.is_op("CC_S<="):
op_nf, op_of, op_zf = args
return op_zf | (op_nf ^ op_of)
elif expr.is_op("CC_S>="):
op_nf, op_of = args
return ~(op_nf ^ op_of)
elif expr.is_op("CC_U>"):
op_cf, op_zf = args
return ~(op_cf | op_zf)
elif expr.is_op("CC_U<"):
op_cf, = args
return op_cf
elif expr.is_op("CC_NEG"):
op_nf, = args
return op_nf
elif expr.is_op("CC_EQ"):
op_zf, = args
return op_zf
elif expr.is_op("CC_NE"):
op_zf, = args
return ~op_zf
elif expr.is_op("CC_POS"):
op_nf, = args
return ~op_nf
return expr
|