src/soc/simulator/program.py

   1 """POWER Program
   2
   3 takes powerpc assembly instructions and turns them into LE/BE binary
   4 data.  calls powerpc64-linux-gnu-as, ld and objcopy to do so.
   5 """
   6
   7 import tempfile
   8 import subprocess
   9 import struct
  10 import os
  11 import sys
  12
  13 filedir = os.path.dirname(os.path.realpath(__file__))
  14 memmap = os.path.join(filedir, "memmap")
  15
  16
  17 class Program:
  18     def __init__(self, instructions, bigendian):
  19         self.bigendian = bigendian
  20         if self.bigendian:
  21             self.endian_fmt = "elf64-big"
  22             self.obj_fmt = "-be"
  23             self.ld_fmt = "-EB"
  24         else:
  25             self.ld_fmt = "-EL"
  26             self.endian_fmt = "elf64-little"
  27             self.obj_fmt = "-le"
  28
  29         if isinstance(instructions, str):  # filename
  30             # read instructions into a BytesIO to avoid "too many open files"
  31             with open(instructions, "rb") as f:
  32                 b = f.read()
  33             self.binfile = BytesIO(b, 'rb')
  34             self.assembly = ''  # noo disassemble number fiiive
  35             print("program", self.binfile)
  36         else:
  37             if isinstance(instructions, list):
  38                 instructions = '\n'.join(instructions)
  39             self.assembly = instructions + '\n'  # plus final newline
  40             self._assemble()
  41         self._instructions = list(self._get_instructions())
  42
  43     def __enter__(self):
  44         return self
  45
  46     def __exit__(self, type, value, traceback):
  47         self.close()
  48
  49     def _get_binary(self, elffile):
  50         self.binfile = tempfile.NamedTemporaryFile(suffix=".bin")
  51         args = ["powerpc64-linux-gnu-objcopy",
  52                 "-O", "binary",
  53                 "-I", self.endian_fmt,
  54                 elffile.name,
  55                 self.binfile.name]
  56         subprocess.check_output(args)
  57
  58     def _link(self, ofile):
  59         with tempfile.NamedTemporaryFile(suffix=".elf") as elffile:
  60             args = ["powerpc64-linux-gnu-ld",
  61                     self.ld_fmt,
  62                     "-o", elffile.name,
  63                     "-T", memmap,
  64                     ofile.name]
  65             subprocess.check_output(args)
  66             self._get_binary(elffile)
  67
  68     def _assemble(self):
  69         with tempfile.NamedTemporaryFile(suffix=".o") as outfile:
  70             args = ["powerpc64-linux-gnu-as",
  71                     '-mpower9',
  72                     self.obj_fmt,
  73                     "-o",
  74                     outfile.name]
  75             p = subprocess.Popen(args, stdin=subprocess.PIPE)
  76             p.communicate(self.assembly.encode('utf-8'))
  77             if p.wait() != 0:
  78                 print("Error in program:")
  79                 print(self.assembly)
  80                 sys.exit(1)
  81             self._link(outfile)
  82
  83     def _get_instructions(self):
  84         while True:
  85             data = self.binfile.read(4)
  86             if not data:
  87                 break
  88             yield struct.unpack('<I', data)[0]  # unsigned int
  89
  90     def generate_instructions(self):
  91         yield from self._instructions
  92
  93     def reset(self):
  94         self.binfile.seek(0)
  95
  96     def size(self):
  97         curpos = self.binfile.tell()
  98         self.binfile.seek(0, 2)  # Seek to end of file
  99         size = self.binfile.tell()
 100         self.binfile.seek(curpos, 0)
 101         return size
 102
 103     def close(self):
 104         self.binfile.close()