60 lines
2 KiB
Python
60 lines
2 KiB
Python
# MIT License
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#
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# Copyright (c) 2023 Neil Webber
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from branches import branches
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from op00 import ops56tab # these have byte variants in op10
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from pdptraps import PDPTraps
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# dispatch MOST (but not all) of the 105x and 106x instructions
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# to the op00 routines but with byte variation (opsize=1). But
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# there are exceptions: 1064 unused, 1065 MFPD, 1066 MTPD, 1067 unused
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def op156(cpu, inst):
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i56x = (inst & 0o7700) >> 6
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# 64 (mark) and 67 (sxt) do NOT have byte variants
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if i56x in (0o64, 0o67):
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raise PDPTraps.ReservedInstruction
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try:
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opf = ops56tab[i56x - 0o50]
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except IndexError:
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raise PDPTraps.ReservedInstruction
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opf(cpu, inst, opsize=1)
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def op10_4_emttrap(cpu, inst):
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# bit 8 determines EMT (0) or TRAP(1)
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if (inst & 0o000400):
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raise PDPTraps.TRAP
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else:
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raise PDPTraps.EMT
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op10_dispatch_table = (
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branches,
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branches,
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branches,
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branches,
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op10_4_emttrap,
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op156,
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op156,
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None)
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