Really fix #23, this time without making Unix crash
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op000.py
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op000.py
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@ -52,7 +52,7 @@ def op_rtt(cpu, inst):
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# this knows KERNEL < SUPERVISOR < USER
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newpsw_d['curmode'] = max(cpu.psw_curmode, newpsw_d['curmode'])
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newpsw_d['prevmode'] = max(cpu.psw_prevmode, newpsw_d['prevmode'])
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newpsw_d['prevmode'] = max(cpu.psw_curmode, newpsw_d['prevmode'])
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# if not in kernel mode, cannot change pri
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if cpu.psw_curmode != cpu.KERNEL:
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