src/soc/decoder/isa/caller.py

   1 from functools import wraps
   2 from soc.decoder.orderedset import OrderedSet
   3 from soc.decoder.selectable_int import SelectableInt, selectconcat
   4
   5 def create_args(reglist, extra=None):
   6     args = OrderedSet()
   7     for reg in reglist:
   8         args.add(reg)
   9     args = list(args)
  10     if extra:
  11         args = [extra] + args
  12     return args
  13
  14 class Mem:
  15
  16     def __init__(self):
  17         self.mem = []
  18         for i in range(128):
  19             self.mem.append(i)
  20
  21     def __call__(self, addr, sz):
  22         res = []
  23         for s in range(sz): # TODO: big/little-end
  24             res.append(SelectableInt(self.mem[addr.value + s], 8))
  25         print ("memread", addr, sz, res)
  26         return selectconcat(*res)
  27
  28     def memassign(self, addr, sz, val):
  29         print ("memassign", addr, sz, val)
  30         for s in range(sz):
  31             byte = (val.value) >> (s*8) & 0xff # TODO: big/little-end
  32             self.mem[addr.value + s] = byte
  33
  34
  35 class GPR(dict):
  36     def __init__(self, decoder, regfile):
  37         dict.__init__(self)
  38         self.sd = decoder
  39         for i in range(32):
  40             self[i] = SelectableInt(regfile[i], 64)
  41
  42     def __call__(self, ridx):
  43         return self[ridx]
  44
  45     def set_form(self, form):
  46         self.form = form
  47
  48     def getz(self, rnum):
  49         #rnum = rnum.value # only SelectableInt allowed
  50         print("GPR getzero", rnum)
  51         if rnum == 0:
  52             return SelectableInt(0, 64)
  53         return self[rnum]
  54
  55     def _get_regnum(self, attr):
  56         getform = self.sd.sigforms[self.form]
  57         rnum = getattr(getform, attr)
  58         return rnum
  59
  60     def ___getitem__(self, attr):
  61         print("GPR getitem", attr)
  62         rnum = self._get_regnum(attr)
  63         return self.regfile[rnum]
  64
  65     def dump(self):
  66         for i in range(0, len(self), 8):
  67             s = []
  68             for j in range(8):
  69                 s.append("%08x" % self[i+j].value)
  70             s = ' '.join(s)
  71             print("reg", "%2d" % i, s)
  72
  73
  74 class ISACaller:
  75     # decoder2 - an instance of power_decoder2
  76     # regfile - a list of initial values for the registers
  77     def __init__(self, decoder2, regfile):
  78         self.gpr = GPR(decoder2, regfile)
  79         self.mem = Mem()
  80         self.namespace = {'GPR': self.gpr,
  81                           'MEM': self.mem,
  82                           'memassign': self.memassign
  83                           }
  84         self.decoder = decoder2
  85
  86     def memassign(self, ea, sz, val):
  87         self.mem.memassign(ea, sz, val)
  88
  89     def prep_namespace(self):
  90         si = yield self.decoder.SI
  91         self.namespace['SI'] = SelectableInt(si, bits=16)
  92
  93     def call(self, name):
  94         yield from self.prep_namespace()
  95
  96         function, read_regs, uninit_regs, write_regs = self.instrs[name]
  97         input_names = create_args(read_regs | uninit_regs)
  98         print(input_names)
  99
 100         inputs = []
 101         for name in input_names:
 102             regnum = yield getattr(self.decoder, name)
 103             print('reading reg %d' % regnum)
 104             inputs.append(self.gpr(regnum))
 105         print(inputs)
 106         results = function(self, *inputs)
 107         print(results)
 108
 109         output_names = create_args(write_regs)
 110         for name, output in zip(output_names, results):
 111             regnum = yield getattr(self.decoder, name)
 112             print('writing reg %d' % regnum)
 113             self.gpr[regnum] = output.narrow(64)
 114
 115
 116 def inject():
 117     """ Decorator factory. """
 118     def variable_injector(func):
 119         @wraps(func)
 120         def decorator(*args, **kwargs):
 121             try:
 122                 func_globals = func.__globals__  # Python 2.6+
 123             except AttributeError:
 124                 func_globals = func.func_globals  # Earlier versions.
 125
 126             context = args[0].namespace
 127             saved_values = func_globals.copy()  # Shallow copy of dict.
 128             func_globals.update(context)
 129
 130             result = func(*args, **kwargs)
 131             #exec (func.__code__, func_globals)
 132
 133             #finally:
 134             #    func_globals = saved_values  # Undo changes.
 135
 136             return result
 137
 138         return decorator
 139
 140     return variable_injector
 141