1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
#! /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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
###############################################################################
#
# $Id: test_SBC.py,v 1.1 2004/07/31 00:59:11 rivetwa Exp $
#
"""Test the SBC opcode.
"""
import base_test
from registers import Reg, SREG
class SBC_TestFail(base_test.TestFail): pass
class base_SBC(base_test.opcode_test):
"""Generic test case for testing SBC opcode.
SBC - Subtract with Carry. [Rd <- Rd - Rr - C]
opcode is '0000 10rd dddd rrrr' where r and d are registers (d is destination).
Only registers PC, Rd and SREG should be changed.
"""
def setup(self):
# Set SREG to zero or (Z and/or C flag set)
self.setup_regs[Reg.SREG] = (self.C << SREG.C) | (self.Z << SREG.Z)
self.setup_regs[Reg.PC] = 0x0100
# Set the register values
self.setup_regs[self.Rd] = self.Vd
self.setup_regs[self.Rr] = self.Vr
# Return the raw opcode
return 0x0800 | (self.Rd << 4) | ((self.Rr & 0x10) << 5) | (self.Rr & 0xf)
def analyze_results(self):
self.reg_changed.extend( [self.Rd, Reg.SREG] )
# check that result is correct
res = (self.Vd - self.Vr - self.C)
expect = res & 0xff
got = self.anal_regs[self.Rd]
if expect != got:
self.fail('SBC r%02d, r%02d: 0x%02x - 0x%02x - %d = (expect=%02x, got=%02x)' % (
self.Rd, self.Rr, self.Vd, self.Vr, self.C, expect, got))
expect_sreg = 0
# calculate what we expect sreg to be (I and T should be zero)
carry = ((~self.Vd & self.Vr) | (self.Vr & res) | (res & ~self.Vd))
H = (carry >> 3) & 1
C = (carry >> 7) & 1
V = (((self.Vd & ~self.Vr & ~res) | (~self.Vd & self.Vr & res)) >> 7) & 1
N = ((expect & 0x80) != 0)
expect_sreg += H << SREG.H
expect_sreg += V << SREG.V
expect_sreg += N << SREG.N
expect_sreg += (N ^ V) << SREG.S
expect_sreg += C << SREG.C
if expect == 0:
expect_sreg += self.Z << SREG.Z
got_sreg = self.anal_regs[Reg.SREG]
if expect_sreg != got_sreg:
self.fail('SBC r%02d, r%02d: 0x%02x - 0x%02x - %d -> SREG (expect=%02x, got=%02x)' % (
self.Rd, self.Rr, self.Vd, self.Vr, self.C, expect_sreg, got_sreg))
#
# Template code for test case.
# The fail method will raise a test specific exception.
#
template = """
class SBC_rd%02d_vd%02x_rr%02d_vr%02x_C%d_Z%d_TestFail(SBC_TestFail): pass
class test_SBC_rd%02d_vd%02x_rr%02d_vr%02x_C%d_Z%d(base_SBC):
Rd = %d
Vd = 0x%x
Rr = %d
Vr = 0x%x
C = %d
Z = %d
def fail(self,s):
raise SBC_rd%02d_vd%02x_rr%02d_vr%02x_C%d_Z%d_TestFail(s)
"""
#
# Define a list of test values such that we all the cases of SREG bits being set.
#
vals = (
( 0x00, 0x00 ),
( 0xff, 0x00 ),
( 0xfe, 0x01 ),
( 0x0f, 0x00 ),
( 0x0f, 0xf0 ),
( 0x01, 0x02 ),
( 0x80, 0x00 )
)
#
# automagically generate the test_SBC_rdNN_vdXX_rrNN_vrXX_C[01]_Z[01] class definitions.
# For these, we don't want Rd=Rr as that is a special case handled below.
#
code = ''
for c,z in ((0,0), (1,0), (0,1), (1,1)):
for d in range(0,32,8):
for r in range(1,32,8):
for vd,vr in vals:
args = (d,vd,r,vr,c,z)*4
code += template % args
# make sure things work if Rd == Rr
for c,z in ((0,0), (1,0), (0,1), (1,1)):
for d in range(0,32,8):
for vd,vr in vals:
args = (d,vd,d,vd,c,z)*4
code += template % args
exec(code)
|
