def __execute_sext(self, instr):
"""Execute SEXT instruction.
"""
op0_size = instr.operands[0].size
op2_size = instr.operands[2].size
op0_val = self.read_operand(instr.operands[0])
op0_msb = extract_sign_bit(op0_val, op0_size)
op2_mask = (2**op2_size-1) & ~(2**op0_size-1) if op0_msb == 1 else 0x0
op2_val = op0_val | op2_mask
self.write_operand(instr.operands[2], op2_val)
return None
def __execute_sext(self, instr):
"""Execute SEXT instruction.
"""
op0_size = instr.operands[0].size
op2_size = instr.operands[2].size
op0_val = self.read_operand(instr.operands[0])
op0_msb = extract_sign_bit(op0_val, op0_size)
op2_mask = (2**op2_size-1) & ~(2**op0_size-1) if op0_msb == 1 else 0x0
op2_val = op0_val | op2_mask
self.write_operand(instr.operands[2], op2_val)
return None
def __execute_bsh(self, instr):
"""Execute BSH instruction.
"""
op0_val = self.read_operand(instr.operands[0])
op1_val = self.read_operand(instr.operands[1])
op1_size = instr.operands[1].size
# Check sign bit.
if extract_sign_bit(op1_val, op1_size) == 0:
op2_val = op0_val << op1_val
else:
op2_val = op0_val >> twos_complement(op1_val, op1_size)
self.write_operand(instr.operands[2], op2_val)
return None
def __execute_bsh(self, instr):
"""Execute BSH instruction.
"""
op0_val = self.read_operand(instr.operands[0])
op1_val = self.read_operand(instr.operands[1])
op1_size = instr.operands[1].size
# Check sign bit.
if extract_sign_bit(op1_val, op1_size) == 0:
op2_val = op0_val << op1_val
else:
op2_val = op0_val >> twos_complement(op1_val, op1_size)
self.write_operand(instr.operands[2], op2_val)
return None
