src/soc/simulator/gas.py

   1 # License: LPGLv3
   2 # Copyright (C) 2020 Michael Nolan <mtnolan2640@gmail.com>
   3 # Copyright (C) 2020 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   4
   5 import tempfile
   6 import subprocess
   7 import struct
   8
   9
  10 def get_assembled_instruction(instruction, bigendian=False):
  11     if bigendian:
  12         endian_fmt = "elf64-big"
  13         obj_fmt = "-be"
  14     else:
  15         endian_fmt = "elf64-little"
  16         obj_fmt = "-le"
  17     with tempfile.NamedTemporaryFile(suffix=".o") as outfile:
  18         args = ["powerpc64-linux-gnu-as",
  19                 obj_fmt,
  20                 "-o",
  21                 outfile.name]
  22         p = subprocess.Popen(args, stdin=subprocess.PIPE)
  23         p.communicate(instruction.encode('utf-8'))
  24         assert(p.wait() == 0)
  25
  26         with tempfile.NamedTemporaryFile(suffix=".bin") as binfile:
  27             args = ["powerpc64-linux-gnu-objcopy",
  28                     "-I", endian_fmt,
  29                     "-O", "binary",
  30                     outfile.name,
  31                     binfile.name]
  32             subprocess.check_output(args)
  33             binary = struct.unpack('>i', binfile.read(4))[0]
  34             return binary