src/openpower/exceptions.py

   1 """exceptions
   2 """
   3 from nmutil.iocontrol import RecordObject
   4 from nmigen import Signal
   5 from collections import namedtuple
   6
   7 exc_types = ['alignment',
   8              'instr_fault', # this one is not an actual exception
   9                             # but information *about* the type of
  10                             # exception that must be generated
  11              'invalid',
  12              'badtree',
  13              'perm_error',
  14              'rc_error',
  15              'segment_fault',
  16              'happened', # must be last: may overlap with Data.ok
  17             ]
  18
  19 LDSTExceptionTuple = namedtuple("LDSTExceptionTuple", exc_types)
  20
  21 # https://bugs.libre-soc.org/show_bug.cgi?id=465
  22 class LDSTException(RecordObject):
  23     _exc_types = exc_types
  24     def __init__(self, name=None):
  25         RecordObject.__init__(self, name=name)
  26         for f in self._exc_types:
  27             setattr(self, f, Signal(name=f))
  28         self.srr1 = Signal(64)
  29     length = len(exc_types) + 64 # update this if adding anything else!