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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_SBIW.py,v 1.2 2002/02/23 05:29:18 troth Exp $
#
"""Test the SBIW opcode.
"""
import base_test
from registers import Reg, SREG
class SBIW_TestFail(base_test.TestFail): pass
class base_SBIW(base_test.opcode_test):
"""Generic test case for testing SBIW opcode.
Add Immediate to Word. [Rd+1:Rd <- Rd+1:Rd - K]
opcode is '1001 0111 KKdd KKKK' where d is {24,26,28,30}, and K is [0,63]
Only registers PC, Rd and SREG should be changed.
"""
def setup(self):
# Set SREG to zero
self.setup_regs[Reg.SREG] = 0x00
# Set the register values
self.setup_regs[self.Rd] = (self.vd & 0xff)
self.setup_regs[self.Rd+1] = (self.vd >> 8)
# Return the raw opcode
return 0x9700 | (((self.Rd/2)-12) << 4) | ((self.vk & 0x30) << 2) | (self.vk & 0xf)
def analyze_results(self):
self.reg_changed.extend( [self.Rd, self.Rd+1, Reg.SREG] )
# check that result is correct
res = (self.vd - self.vk)
expect = res & 0xffff
got = self.anal_regs[self.Rd] + (self.anal_regs[self.Rd+1] << 8)
if expect != got:
self.fail('SBIW r%02d, r%02x: 0x%04x - 0x%02x = (expect=%02x, got=%02x)' % (
self.Rd, self.vk, self.vd, self.vk, expect, got))
expect_sreg = 0
# calculate what we expect sreg to be (I, T and H should be zero)
V = ((self.vd & ~res) >> 15) & 1
N = ((expect >> 15) & 1)
expect_sreg += V << SREG.V
expect_sreg += N << SREG.N
expect_sreg += (N ^ V) << SREG.S
expect_sreg += (expect == 0) << SREG.Z
expect_sreg += (((res & ~self.vd >> 15)) & 1) << SREG.C
got_sreg = self.anal_regs[Reg.SREG]
if expect_sreg != got_sreg:
self.fail('SBIW r%02d, r%02x: 0x%04x - 0x%02x -> SREG (expect=%02x, got=%02x)' % (
self.Rd, self.vk, self.vd, self.vk, expect_sreg, got_sreg))
#
# Template code for test case.
# The fail method will raise a test specific exception.
#
template = """
class SBIW_r%02d_v%04x_k%02x_TestFail(SBIW_TestFail): pass
class test_SBIW_r%02d_v%04x_k%02x(base_SBIW):
Rd = %d
vd = 0x%x
vk = 0x%x
def fail(self,s):
raise SBIW_r%02d_v%04x_k%02x_TestFail, s
"""
# reg val, k val (0x00 <= k <= 0x3f)
vals = (
( 0x0000, 0x00 ),
( 0x0000, 0x3f ),
( 0x00ff, 0x01 ),
( 0xffbf, 0x3f ),
( 0xffff, 0x01 ),
( 0x0000, 0x01 ),
( 0x8000, 0x01 )
)
#
# automagically generate the test_SBIW_rdNN_vdXX_rrNN_vrXX_C[01] class definitions.
# For these, we don't want Rd=Rr as that is a special case handled below.
#
code = ''
for d in range(24,32,2):
for vd,vk in vals:
args = (d,vd,vk)*4
code += template % args
exec code
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