src/soc/simulator/program.py

   1 import tempfile
   2 import subprocess
   3 import struct
   4 import os
   5
   6 filedir = os.path.dirname(os.path.realpath(__file__))
   7 memmap = os.path.join(filedir, "memmap")
   8
   9 bigendian = True
  10 endian_fmt = "elf64-big"
  11 obj_fmt = "-be"
  12
  13
  14 class Program:
  15     def __init__(self, instructions):
  16         if isinstance(instructions, list):
  17             instructions = '\n'.join(instructions)
  18         self.assembly = instructions + '\n' # plus final newline
  19         self._assemble()
  20
  21     def __enter__(self):
  22         return self
  23
  24     def __exit__(self, type, value, traceback):
  25         self.close()
  26
  27     def _get_binary(self, elffile):
  28         self.binfile = tempfile.NamedTemporaryFile(suffix=".bin")
  29         args = ["powerpc64-linux-gnu-objcopy",
  30                 "-O", "binary",
  31                 "-I", endian_fmt,
  32                 elffile.name,
  33                 self.binfile.name]
  34         subprocess.check_output(args)
  35
  36     def _link(self, ofile):
  37         with tempfile.NamedTemporaryFile(suffix=".elf") as elffile:
  38             args = ["powerpc64-linux-gnu-ld",
  39                     "-o", elffile.name,
  40                     "-T", memmap,
  41                     ofile.name]
  42             subprocess.check_output(args)
  43             self._get_binary(elffile)
  44
  45     def _assemble(self):
  46         with tempfile.NamedTemporaryFile(suffix=".o") as outfile:
  47             args = ["powerpc64-linux-gnu-as",
  48                     obj_fmt,
  49                     "-o",
  50                     outfile.name]
  51             p = subprocess.Popen(args, stdin=subprocess.PIPE)
  52             p.communicate(self.assembly.encode('utf-8'))
  53             assert(p.wait() == 0)
  54             self._link(outfile)
  55
  56     def generate_instructions(self):
  57         while True:
  58             data = self.binfile.read(4)
  59             if not data:
  60                 break
  61             yield struct.unpack('<i', data)[0]
  62
  63     def reset(self):
  64         self.binfile.seek(0)
  65
  66     def size(self):
  67         curpos = self.binfile.tell()
  68         self.binfile.seek(0, 2)  # Seek to end of file
  69         size = self.binfile.tell()
  70         self.binfile.seek(curpos, 0)
  71         return size
  72
  73     def close(self):
  74         self.binfile.close()