tests/testlib.py

   1 import os.path
   2 import pexpect
   3 import subprocess
   4 import tempfile
   5 import testlib
   6 import unittest
   7
   8 # Note that gdb comes with its own testsuite. I was unable to figure out how to
   9 # run that testsuite against the spike simulator.
  10
  11 def find_file(path):
  12     for directory in (os.getcwd(), os.path.dirname(testlib.__file__)):
  13         fullpath = os.path.join(directory, path)
  14         if os.path.exists(fullpath):
  15             return fullpath
  16     raise ValueError("Couldn't find %r." % path)
  17
  18 def compile(src):
  19     """Compile a single .c file into a binary."""
  20     src = find_file(src)
  21     dst = os.path.splitext(src)[0]
  22     cc = os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gcc")
  23     cmd = "%s -g -o %s %s" % (cc, dst, src)
  24     result = os.system(cmd)
  25     assert result == 0, "%r failed" % cmd
  26     return dst
  27
  28 def unused_port():
  29     # http://stackoverflow.com/questions/2838244/get-open-tcp-port-in-python/2838309#2838309
  30     import socket
  31     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  32     s.bind(("",0))
  33     port = s.getsockname()[1]
  34     s.close()
  35     return port
  36
  37 def spike(binary, halted=False):
  38     """Launch spike. Return tuple of its process and the port it's running on."""
  39     cmd = [find_file("spike")]
  40     if halted:
  41         cmd.append('-H')
  42     port = unused_port()
  43     cmd += ['--gdb-port', str(port), 'pk', binary]
  44     logfile = open("spike.log", "w")
  45     return subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=logfile,
  46             stderr=logfile), port
  47
  48 class Gdb(object):
  49     def __init__(self):
  50         path = os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gdb")
  51         self.child = pexpect.spawn(path)
  52         self.child.logfile = file("gdb.log", "w")
  53         self.wait()
  54         self.command("set width 0")
  55         self.command("set height 0")
  56
  57     def wait(self):
  58         """Wait for prompt."""
  59         self.child.expect("\(gdb\)")
  60
  61     def command(self, command):
  62         self.child.sendline(command)
  63         self.child.expect("\n")
  64         self.child.expect("\(gdb\)")
  65         return self.child.before.strip()
  66
  67     def x(self, address, size='w'):
  68         output = self.command("x/%s %s" % (size, address))
  69         value = int(output.split(':')[1].strip(), 0)
  70         return value
  71
  72     def p(self, obj):
  73         output = self.command("p %s" % obj)
  74         value = int(output.split('=')[-1].strip())
  75         return value
  76
  77     def stepi(self):
  78         return self.command("stepi")