riscv/dispatch

   1 #!/usr/bin/python
   2 import sys
   3
   4 if len(sys.argv) == 3:
   5   numfiles = int(sys.argv[1])
   6   tablesz = int(sys.argv[2])
   7   filenum = numfiles+1
   8 else:
   9   filenum = int(sys.argv[1])
  10   numfiles = int(sys.argv[2])
  11   tablesz = int(sys.argv[3])
  12
  13 match = {}
  14 mask = {}
  15 seen = {}
  16 for line in sys.stdin:
  17   (name, mtch, msk) = line.split('(')[1].split(')')[0].split(',')
  18   match[name] = int(mtch,16)
  19   mask[name] = int(msk,16)
  20
  21 redundant = {}
  22 for name in match.iterkeys():
  23   if (mask[name] & (tablesz-1)) == mask[name]:
  24     for i in range(match[name]+1, tablesz):
  25       if (i & mask[name]) == match[name]:
  26         redundant[i] = match[name]
  27
  28 illegal = -1
  29 for i in range(0, tablesz):
  30   used = 0
  31   for name in match.iterkeys():
  32     if match[name] % tablesz == (i & mask[name]):
  33       used = 1
  34   if not used and illegal == -1:
  35     illegal = i
  36   elif not used:
  37     redundant[i] = illegal
  38
  39 if filenum == numfiles:
  40   print '#include "processor.h"'
  41   print 'const insn_func_t processor_t::dispatch_table[DISPATCH_TABLE_SIZE] = {'
  42   for i in range(0, tablesz):
  43     func = i
  44     if i in redundant:
  45       func = redundant[i]
  46     print '  &processor_t::insn_func_%d,' % func
  47   print '};'
  48
  49 if filenum == numfiles+1:
  50   print 'static const size_t DISPATCH_TABLE_SIZE = %d;' % tablesz
  51   print 'static const insn_func_t dispatch_table[DISPATCH_TABLE_SIZE];'
  52   for i in range(0, tablesz):
  53     if i not in redundant:
  54       print 'reg_t insn_func_%d(insn_t insn, reg_t reg);' % i
  55   sys.exit(0)
  56
  57 print '#include "insn_header.h"'
  58
  59 for i in range(0, tablesz):
  60   if i % numfiles != filenum or i in redundant:
  61     continue
  62
  63   print 'reg_t processor_t::insn_func_%d(insn_t insn, reg_t pc)' % i
  64   print '{'
  65   for name in match.iterkeys():
  66     if match[name] % tablesz == (i & mask[name]):
  67       print '  if((insn.bits & 0x%x) == 0x%x)' % (mask[name] & ~(tablesz-1), \
  68                                                   match[name] & ~(tablesz-1))
  69       print '  {'
  70       print '    reg_t npc = pc + insn_length(0x%x);' % match[name]
  71       print '    #include "insns/%s.h"' % name
  72       print '    return npc;'
  73       print '  }'
  74       print '  else',
  75
  76   print '  throw trap_illegal_instruction;'
  77   print '}\n'