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#! /usr/bin/env python
###############################################################################
#
# simulavr - A simulator for the Atmel AVR family of microcontrollers.
# Copyright (C) 2001, 2002 Theodore A. Roth
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
###############################################################################
#
# $Id: test_LSR.py,v 1.1 2002/02/23 01:35:39 troth Exp $
#
"""Test the LSR opcode.
"""
import base_test
from registers import Reg, SREG
class LSR_TestFail(base_test.TestFail): pass
class base_LSR(base_test.opcode_test):
"""Generic test case for testing LSR opcode.
LSR - Arithmetic ShiftRight
opcode is '1001 010d dddd 0110' where d is register (0-31)
Only registers PC, Rd and SREG should be changed.
"""
def setup(self):
# Set SREG to have N set (operation should clear N)
self.setup_regs[Reg.SREG] = 1 << SREG.N
# Set the register values
self.setup_regs[self.Rd] = self.Vd
# Return the raw opcode
return 0x9406 | (self.Rd << 4)
def analyze_results(self):
self.reg_changed.extend( [self.Rd, Reg.SREG] )
# check that result is correct
expect = ((self.Vd >> 1) & 0x7f)
got = self.anal_regs[self.Rd]
if expect != got:
self.fail('LSR r%02d: 0x%02x = (expect=%02x, got=%02x)' % (
self.Rd, self.Vd, expect, got))
expect_sreg = 0
# calculate what we expect sreg to be (I, T and H should be zero)
C = self.Vd & 1
N = 0
V = N ^ C
expect_sreg += (N ^ V) << SREG.S
expect_sreg += V << SREG.V
expect_sreg += (expect == 0) << SREG.Z
expect_sreg += C << SREG.C
got_sreg = self.anal_regs[Reg.SREG]
if expect_sreg != got_sreg:
self.fail('LSR r%02d: 0x%02x -> SREG (expect=%02x, got=%02x)' % (
self.Rd, self.Vd, expect_sreg, got_sreg))
#
# Template code for test case.
# The fail method will raise a test specific exception.
#
template = """
class LSR_r%02d_v%02x_TestFail(LSR_TestFail): pass
class test_LSR_r%02d_v%02x(base_LSR):
Rd = %d
Vd = 0x%x
def fail(self,s):
raise LSR_r%02d_v%02x_TestFail, s
"""
#
# Define a list of test values such that we test all the cases of SREG bits being set.
#
vals = (
0x00,
0xff,
0x10,
0x80,
0xaa
)
#
# automagically generate the test_LSR_rNN_vXX class definitions.
#
code = ''
for d in range(32):
for vd in vals:
args = (d,vd)*4
code += template % args
exec code
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