src/openpower/simulator/program.py

   1 # License: LGPLv3+
   2 # Copyright (C) 2020 Michael Nolan <mtnolan2640@gmail.com>
   3 # Copyright (C) 2020 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   4
   5 """POWER Program
   6
   7 takes powerpc assembly instructions and turns them into LE/BE binary
   8 data.  calls powerpc64-linux-gnu-as, ld and objcopy to do so.
   9 """
  10
  11 import tempfile
  12 import subprocess
  13 import struct
  14 import os
  15 import sys
  16 from io import BytesIO
  17
  18 from openpower.simulator.envcmds import cmds
  19
  20 filedir = os.path.dirname(os.path.realpath(__file__))
  21 memmap = os.path.join(filedir, "memmap")
  22
  23
  24 class Program:
  25     def __init__(self, instructions, bigendian):
  26         self.bigendian = bigendian
  27         if self.bigendian:
  28             self.endian_fmt = "elf64-big"
  29             self.obj_fmt = "-be"
  30             self.ld_fmt = "-EB"
  31         else:
  32             self.ld_fmt = "-EL"
  33             self.endian_fmt = "elf64-little"
  34             self.obj_fmt = "-le"
  35
  36         if isinstance(instructions, bytes):  # actual bytes
  37             self.binfile = BytesIO(instructions)
  38             self.binfile.name = "assembly"
  39             self.assembly = ''  # noo disassemble number fiiive
  40             print("binary", self.binfile)
  41         elif isinstance(instructions, str):  # filename
  42             # read instructions into a BytesIO to avoid "too many open files"
  43             with open(instructions, "rb") as f:
  44                 b = f.read()
  45             self.binfile = BytesIO(b)
  46             self.assembly = ''  # noo disassemble number fiiive
  47             print("program", self.binfile)
  48         else:
  49             if isinstance(instructions, list):
  50                 instructions = '\n'.join(instructions)
  51             self.assembly = instructions + '\n'  # plus final newline
  52             self._assemble()
  53         self._instructions = list(self._get_instructions())
  54
  55     def __enter__(self):
  56         return self
  57
  58     def __exit__(self, type, value, traceback):
  59         self.close()
  60
  61     def _get_binary(self, elffile):
  62         self.binfile = tempfile.NamedTemporaryFile(suffix=".bin")
  63         args = [cmds['objcopy'],
  64                 "-O", "binary",
  65                 "-I", self.endian_fmt,
  66                 elffile.name,
  67                 self.binfile.name]
  68         subprocess.check_output(args)
  69
  70     def _link(self, ofile):
  71         with tempfile.NamedTemporaryFile(suffix=".elf") as elffile:
  72             args = [cmds['ld'],
  73                     self.ld_fmt,
  74                     "-o", elffile.name,
  75                     "-T", memmap,
  76                     ofile.name]
  77             subprocess.check_output(args)
  78             self._get_binary(elffile)
  79
  80     def _assemble(self):
  81         with tempfile.NamedTemporaryFile(suffix=".o") as outfile:
  82             args = [cmds['as'],
  83                     '-mpower9',
  84                     '-mregnames',
  85                     self.obj_fmt,
  86                     "-o",
  87                     outfile.name]
  88             p = subprocess.Popen(args, stdin=subprocess.PIPE)
  89             p.communicate(self.assembly.encode('utf-8'))
  90             if p.wait() != 0:
  91                 print("Error in program:")
  92                 print(self.assembly)
  93                 sys.exit(1)
  94             self._link(outfile)
  95
  96     def _get_instructions(self):
  97         while True:
  98             data = self.binfile.read(4)
  99             if not data:
 100                 break
 101             yield struct.unpack('<I', data)[0]  # unsigned int
 102
 103     def generate_instructions(self):
 104         yield from self._instructions
 105
 106     def reset(self):
 107         self.binfile.seek(0)
 108
 109     def size(self):
 110         curpos = self.binfile.tell()
 111         self.binfile.seek(0, 2)  # Seek to end of file
 112         size = self.binfile.tell()
 113         self.binfile.seek(curpos, 0)
 114         return size
 115
 116     def write_bin(self, fname):
 117         self.reset()
 118         data = self.binfile.read()
 119         with open(fname, "wb") as f:
 120             f.write(data)
 121
 122     def close(self):
 123         self.binfile.close()
 124
 125 if __name__ == '__main__':
 126     lst = ['addi 5, 0, 4660/2',
 127            'mtcrf 255, 5+3',
 128            'mfocrf 2, 1',
 129            'addi r2, 3, 1',
 130            'attn',
 131           ]
 132     lst = ["addi 9, 0, 0x10",  # i = 16
 133            "addi 9,9,-1",    # i = i - 1
 134            "cmpi 2,1,9,12",     # compare 9 to value 12, store in CR2
 135            "bc 4,10,-8",        # branch if CR2 "test was != 12"
 136            'attn',
 137            ]
 138
 139     with Program(lst, False) as p:
 140         for instruction in p.generate_instructions():
 141             print (hex(instruction))
 142         p.write_bin("/tmp/test.bin")