src/soc/simulator/qemu.py

   1 from pygdbmi.gdbcontroller import GdbController
   2 import subprocess
   3
   4 launch_args = ['qemu-system-ppc64',
   5                '-machine', 'powernv9',
   6                '-nographic',
   7                '-s', '-S']
   8
   9
  10 class QemuController:
  11     def __init__(self, kernel):
  12         args = launch_args + ['-kernel', kernel]
  13         self.qemu_popen = subprocess.Popen(args,
  14                                            stdout=subprocess.PIPE,
  15                                            stdin=subprocess.PIPE)
  16         self.gdb = GdbController(gdb_path='powerpc64-linux-gnu-gdb')
  17
  18     def __enter__(self):
  19         return self
  20
  21     def __exit__(self, type, value, traceback):
  22         self.exit()
  23
  24     def connect(self):
  25         return self.gdb.write('-target-select remote localhost:1234')
  26
  27     def break_address(self, addr):
  28         cmd = '-break-insert *0x{:x}'.format(addr)
  29         return self.gdb.write(cmd)
  30
  31     def get_registers(self):
  32         return self.gdb.write('-data-list-register-values x')
  33
  34     def get_register(self, num):
  35         res = self.gdb.write('-data-list-register-values x {}'.format(num),timeout_sec=1.0) # increase this timeout if needed
  36         for x in res:
  37             if(x["type"]=="result"):
  38                 assert 'register-values' in x['payload']
  39                 return int(x['payload']['register-values'][0]['value'], 0)
  40         return None
  41
  42     def step(self):
  43         return self.gdb.write('-exec-next-instruction')
  44
  45     def gdb_continue(self):
  46         return self.gdb.write('-exec-continue')
  47
  48     def exit(self):
  49         self.gdb.exit()
  50         self.qemu_popen.kill()
  51         outs, errs = self.qemu_popen.communicate()
  52         self.qemu_popen.stdout.close()
  53         self.qemu_popen.stdin.close()
  54
  55
  56 def run_program(program):
  57     q = QemuController(program.binfile.name)
  58     q.connect()
  59     q.break_address(0x20000000 + program.size())
  60     q.gdb_continue()
  61     return q
  62
  63
  64 if __name__ == '__main__':
  65     q = QemuController("qemu_test/kernel.bin")
  66     q.connect()
  67     q.break_address(0x20000000)
  68     q.gdb_continue()
  69     print(q.get_register(1))
  70     print(q.step())
  71     print(q.get_register(1))
  72     q.exit()