tests/tcg/multiarch/gdbstub/prot-none.py

   1 """Test that GDB can access PROT_NONE pages.
   2
   3 This runs as a sourced script (via -x, via run-test.py).
   4
   5 SPDX-License-Identifier: GPL-2.0-or-later
   6 """
   7 import ctypes
   8 from test_gdbstub import main, report
   9
  10
  11 def probe_proc_self_mem():
  12     buf = ctypes.create_string_buffer(b'aaa')
  13     try:
  14         with open("/proc/self/mem", "rb") as fp:
  15             fp.seek(ctypes.addressof(buf))
  16             return fp.read(3) == b'aaa'
  17     except OSError:
  18         return False
  19
  20
  21 def run_test():
  22     """Run through the tests one by one"""
  23     if not probe_proc_self_mem:
  24         print("SKIP: /proc/self/mem is not usable")
  25         exit(0)
  26     gdb.Breakpoint("break_here")
  27     gdb.execute("continue")
  28     val = gdb.parse_and_eval("*(char[2] *)q").string()
  29     report(val == "42", "{} == 42".format(val))
  30     gdb.execute("set *(char[3] *)q = \"24\"")
  31     gdb.execute("continue")
  32     exitcode = int(gdb.parse_and_eval("$_exitcode"))
  33     report(exitcode == 0, "{} == 0".format(exitcode))
  34
  35
  36 main(run_test)