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 delete_breakpoint(self, breakpoint=None):
  32         breakstring = ''
  33         if breakpoint:
  34             breakstring = f' {breakpoint}'
  35         return self.gdb.write('-break-delete' + breakstring)
  36
  37     def get_mem(self, addr, nbytes):
  38         res = self.gdb.write("-data-read-memory %d u 8 1 %d" % (addr, nbytes))
  39         print ("get_mem", res)
  40         for x in res:
  41             if(x["type"]=="result"):
  42                 return x['payload']['memory'][0]['data']
  43         return None
  44
  45     def get_registers(self):
  46         return self.gdb.write('-data-list-register-values x')
  47
  48     def _get_register(self, fmt):
  49         res = self.gdb.write('-data-list-register-values '+fmt,
  50                              timeout_sec=1.0) # increase this timeout if needed
  51         for x in res:
  52             if(x["type"]=="result"):
  53                 assert 'register-values' in x['payload']
  54                 return int(x['payload']['register-values'][0]['value'], 0)
  55         return None
  56
  57     # TODO: use -data-list-register-names instead of hardcoding the values
  58     def get_pc(self): return self._get_register('x 64')
  59     def get_msr(self): return self._get_register('x 65')
  60     def get_cr(self): return self._get_register('x 66')
  61     def get_lr(self): return self._get_register('x 67')
  62     def get_ctr(self): return self._get_register('x 68') # probably
  63     def get_xer(self): return self._get_register('x 69')
  64     def get_fpscr(self): return self._get_register('x 70')
  65     def get_mq(self): return self._get_register('x 71')
  66     def get_register(self, num):
  67         return self._get_register('x {}'.format(num))
  68
  69     def step(self):
  70         return self.gdb.write('-exec-next-instruction')
  71
  72     def gdb_continue(self):
  73         return self.gdb.write('-exec-continue')
  74
  75     def gdb_eval(self, expr):
  76         return self.gdb.write(f'-data-evaluate-expression {expr}')
  77
  78     def exit(self):
  79         self.gdb.exit()
  80         self.qemu_popen.kill()
  81         outs, errs = self.qemu_popen.communicate()
  82         self.qemu_popen.stdout.close()
  83         self.qemu_popen.stdin.close()
  84
  85
  86 def run_program(program):
  87     q = QemuController(program.binfile.name)
  88     q.connect()
  89     # Run to the start of the program
  90     q.break_address(0x20000000)
  91     q.gdb_continue()
  92     # set the CR to 0, matching the simulator
  93     q.gdb_eval('$cr=0')
  94     # delete the previous breakpoint so loops don't screw things up
  95     q.delete_breakpoint()
  96     # run to completion
  97     q.break_address(0x20000000 + program.size())
  98     q.gdb_continue()
  99     return q
 100
 101
 102 if __name__ == '__main__':
 103     q = QemuController("qemu_test/kernel.bin")
 104     q.connect()
 105     q.break_address(0x20000000)
 106     q.gdb_continue()
 107     print(q.get_register(1))
 108     print(q.step())
 109     print(q.get_register(1))
 110     q.exit()