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             self.binfile = open(instructions, "rb")
  31             self.assembly = '' # noo disassemble number fiiive
  32             print ("program", self.binfile)
  33         else:
  34             if isinstance(instructions, list):
  35                 instructions = '\n'.join(instructions)
  36             self.assembly = instructions + '\n' # plus final newline
  37             self._assemble()
  38         self._instructions = list(self._get_instructions())
  39
  40     def __enter__(self):
  41         return self
  42
  43     def __exit__(self, type, value, traceback):
  44         self.close()
  45
  46     def _get_binary(self, elffile):
  47         self.binfile = tempfile.NamedTemporaryFile(suffix=".bin")
  48         args = ["powerpc64-linux-gnu-objcopy",
  49                 "-O", "binary",
  50                 "-I", self.endian_fmt,
  51                 elffile.name,
  52                 self.binfile.name]
  53         subprocess.check_output(args)
  54
  55     def _link(self, ofile):
  56         with tempfile.NamedTemporaryFile(suffix=".elf") as elffile:
  57             args = ["powerpc64-linux-gnu-ld",
  58                     self.ld_fmt,
  59                     "-o", elffile.name,
  60                     "-T", memmap,
  61                     ofile.name]
  62             subprocess.check_output(args)
  63             self._get_binary(elffile)
  64
  65     def _assemble(self):
  66         with tempfile.NamedTemporaryFile(suffix=".o") as outfile:
  67             args = ["powerpc64-linux-gnu-as",
  68                     '-mpower9',
  69                     self.obj_fmt,
  70                     "-o",
  71                     outfile.name]
  72             p = subprocess.Popen(args, stdin=subprocess.PIPE)
  73             p.communicate(self.assembly.encode('utf-8'))
  74             if p.wait() != 0:
  75                 print("Error in program:")
  76                 print(self.assembly)
  77                 sys.exit(1)
  78             self._link(outfile)
  79
  80     def _get_instructions(self):
  81         while True:
  82             data = self.binfile.read(4)
  83             if not data:
  84                 break
  85             yield struct.unpack('<i', data)[0]
  86
  87     def generate_instructions(self):
  88         yield from self._instructions
  89
  90     def reset(self):
  91         self.binfile.seek(0)
  92
  93     def size(self):
  94         curpos = self.binfile.tell()
  95         self.binfile.seek(0, 2)  # Seek to end of file
  96         size = self.binfile.tell()
  97         self.binfile.seek(curpos, 0)
  98         return size
  99
 100     def close(self):
 101         self.binfile.close()