debug/testlib.py

   1 import os.path
   2 import pexpect
   3 import shlex
   4 import subprocess
   5 import tempfile
   6 import testlib
   7 import unittest
   8
   9 # Note that gdb comes with its own testsuite. I was unable to figure out how to
  10 # run that testsuite against the spike simulator.
  11
  12 def find_file(path):
  13     for directory in (os.getcwd(), os.path.dirname(testlib.__file__)):
  14         fullpath = os.path.join(directory, path)
  15         if os.path.exists(fullpath):
  16             return fullpath
  17     return None
  18
  19 def compile(args, xlen=32):
  20     """Compile a single .c file into a binary."""
  21     dst = os.path.splitext(args[0])[0]
  22     cc = os.path.expandvars("$RISCV/bin/riscv%d-unknown-elf-gcc" % xlen)
  23     cmd = [cc, "-g", "-o", dst]
  24     for arg in args:
  25         found = find_file(arg)
  26         if found:
  27             cmd.append(found)
  28         else:
  29             cmd.append(arg)
  30     cmd = " ".join(cmd)
  31     result = os.system(cmd)
  32     assert result == 0, "%r failed" % cmd
  33     return dst
  34
  35 def unused_port():
  36     # http://stackoverflow.com/questions/2838244/get-open-tcp-port-in-python/2838309#2838309
  37     import socket
  38     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  39     s.bind(("",0))
  40     port = s.getsockname()[1]
  41     s.close()
  42     return port
  43
  44 class Spike(object):
  45     def __init__(self, cmd, binary=None, halted=False, with_gdb=True, timeout=None,
  46             xlen=64):
  47         """Launch spike. Return tuple of its process and the port it's running on."""
  48         if cmd:
  49             cmd = shlex.split(cmd)
  50         else:
  51             cmd = ["spike"]
  52         if (xlen == 32):
  53             cmd += ["--isa", "RV32"]
  54
  55         if timeout:
  56             cmd = ["timeout", str(timeout)] + cmd
  57
  58         if halted:
  59             cmd.append('-H')
  60         if with_gdb:
  61             self.port = unused_port()
  62             cmd += ['--gdb-port', str(self.port)]
  63         cmd.append('pk')
  64         if binary:
  65             cmd.append(binary)
  66         logfile = open("spike.log", "w")
  67         logfile.write("+ %s\n" % " ".join(cmd))
  68         self.process = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=logfile,
  69                 stderr=logfile)
  70
  71     def __del__(self):
  72         try:
  73             self.process.kill()
  74             self.process.wait()
  75         except OSError:
  76             pass
  77
  78     def wait(self, *args, **kwargs):
  79         return self.process.wait(*args, **kwargs)
  80
  81 class Openocd(object):
  82     def __init__(self, cmd=None, config=None, debug=True):
  83         if cmd:
  84             cmd = shlex.split(cmd)
  85         else:
  86             cmd = ["openocd"]
  87         if config:
  88             cmd += ["-f", find_file(config)]
  89         if debug:
  90             cmd.append("-d")
  91         logfile = open("openocd.log", "w")
  92         self.process = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=logfile,
  93                 stderr=logfile)
  94         # TODO: Pick a random port
  95         self.port = 3333
  96
  97     def __del__(self):
  98         try:
  99             self.process.kill()
 100             self.process.wait()
 101         except OSError:
 102             pass
 103
 104 class Gdb(object):
 105     def __init__(self,
 106             path=os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gdb")):
 107         self.child = pexpect.spawn(path)
 108         self.child.logfile = file("gdb.log", "w")
 109         self.wait()
 110         self.command("set confirm off")
 111         self.command("set width 0")
 112         self.command("set height 0")
 113         # Force consistency.
 114         self.command("set print entry-values no")
 115
 116     def wait(self):
 117         """Wait for prompt."""
 118         self.child.expect("\(gdb\)")
 119
 120     def command(self, command, timeout=-1):
 121         self.child.sendline(command)
 122         self.child.expect("\n", timeout=timeout)
 123         self.child.expect("\(gdb\)", timeout=timeout)
 124         return self.child.before.strip()
 125
 126     def c(self, wait=True):
 127         if wait:
 128             output = self.command("c")
 129             assert "Continuing" in output
 130             return output
 131         else:
 132             self.child.sendline("c")
 133             self.child.expect("Continuing")
 134
 135     def interrupt(self):
 136         self.child.send("\003");
 137         self.child.expect("\(gdb\)")
 138         return self.child.before.strip()
 139
 140     def x(self, address, size='w'):
 141         output = self.command("x/%s %s" % (size, address))
 142         value = int(output.split(':')[1].strip(), 0)
 143         return value
 144
 145     def p(self, obj):
 146         output = self.command("p/x %s" % obj)
 147         value = int(output.split('=')[-1].strip(), 0)
 148         return value
 149
 150     def stepi(self):
 151         output = self.command("stepi")
 152         assert "Cannot" not in output
 153         return output
 154
 155     def load(self):
 156         output = self.command("load", timeout=60)
 157         assert "failed" not in  output
 158         assert "Transfer rate" in output
 159
 160     def b(self, location):
 161         output = self.command("b %s" % location)
 162         assert "not defined" not in output
 163         assert "Breakpoint" in output
 164         return output
 165
 166     def hbreak(self, location):
 167         output = self.command("hbreak %s" % location)
 168         assert "not defined" not in output
 169         assert "Hardware assisted breakpoint" in output
 170         return output