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###############################################################################
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# simulavr - A simulator for the Atmel AVR family of microcontrollers.
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# Copyright (C) 2001, 2002 Theodore A. Roth
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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###############################################################################
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# $Id: test_RETI.py,v 0.5 josef
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"""Test the RETI opcode.
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from registers import Reg, SREG
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class RETI_TestFail(base_test.TestFail): pass
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class base_RETI(base_test.opcode_stack_test):
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"""Generic test case for testing RETI opcode.
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The derived class must provide the reg member and the fail method.
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description: RETI - return from interrupt routine the return address
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is loaded from the stack and set the global interrupt flag
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opcode is '1001 0101 0001 1000'
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# set the pc to a different position
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self.setup_regs[Reg.PC] = self.old_pc * 2
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# put the value on the stack
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self.setup_word_to_stack(self.new_pc)
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self.setup_regs[Reg.SREG] = 0
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def analyze_results(self):
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self.is_pc_checked = 1
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self.reg_changed.extend( [ Reg.SP, Reg.SREG ] )
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# check that SP changed correctly
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expect = self.setup_regs[Reg.SP] + 2
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got = self.anal_regs[Reg.SP]
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self.fail('RETI stack pop failed! SP: expect=%x, got=%x' % (
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# check that PC changed correctly
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got = self.anal_regs[Reg.PC]/2
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self.fail('RETI operation failed! PC: expect=%x, got=%x' % (
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# check that the SREG.I flag is set and no others changed
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expect = 0x1 << SREG.I
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got = self.anal_regs[Reg.SREG]
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self.fail('SREG incorrectly updated: expect=%02x, got=%02x' %(expect, got))
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# Template code for test case.
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# The fail method will raise a test specific exception.
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template = """class RETI_new_%06x_old_%06x_TestFail(RETI_TestFail): pass
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class test_RETI_old_%06x_new_%06x(base_RETI):
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raise RETI_new_%06x_old_%06x_TestFail, s
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# automagically generate the test_RETI_* class definitions
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for old_pc in (0,255,256,(8*1024/2-1)):
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for new_pc in (0,1,2,3,255,256,(8*1024/2-1)):
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args = (old_pc,new_pc)*4
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code += template % args
added
removed
regress/test_opcodes/test_RETI.py
