X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=debug%2Ftestlib.py;h=90702bf605652b08372a3a96f2b0b4af07403cf7;hb=8e0f6a0b1a33d35f2248628af7333ede093341d0;hp=8b799e755c411e216cc829b8fda74cdd3e0b8f6f;hpb=ead84fbc720db4c8f42bb6a7ae979dbb4f8f6c5d;p=riscv-tests.git

diff --git a/debug/testlib.py b/debug/testlib.py
index 8b799e7..90702bf 100644
--- a/debug/testlib.py
+++ b/debug/testlib.py
@@ -1,109 +1,181 @@
+import collections
+import os
 import os.path
+import random
 import re
 import shlex
 import subprocess
+import sys
+import tempfile
 import time
+import traceback
 
 import pexpect
 
+print_log_names = False
+real_stdout = sys.stdout
+
 # Note that gdb comes with its own testsuite. I was unable to figure out how to
 # run that testsuite against the spike simulator.
 
 def find_file(path):
     for directory in (os.getcwd(), os.path.dirname(__file__)):
         fullpath = os.path.join(directory, path)
-        if os.path.exists(fullpath):
-            return fullpath
+        relpath = os.path.relpath(fullpath)
+        if len(relpath) >= len(fullpath):
+            relpath = fullpath
+        if os.path.exists(relpath):
+            return relpath
     return None
 
 def compile(args, xlen=32): # pylint: disable=redefined-builtin
-    cc = os.path.expandvars("$RISCV/bin/riscv%d-unknown-elf-gcc" % xlen)
+    cc = os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gcc")
     cmd = [cc, "-g"]
+    if xlen == 32:
+        cmd.append("-march=rv32imac")
+        cmd.append("-mabi=ilp32")
+    else:
+        cmd.append("-march=rv64imac")
+        cmd.append("-mabi=lp64")
     for arg in args:
         found = find_file(arg)
         if found:
             cmd.append(found)
         else:
             cmd.append(arg)
-    cmd = " ".join(cmd)
-    result = os.system(cmd)
-    assert result == 0, "%r failed" % cmd
-
-def unused_port():
-    # http://stackoverflow.com/questions/2838244/get-open-tcp-port-in-python/2838309#2838309
-    import socket
-    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    s.bind(("", 0))
-    port = s.getsockname()[1]
-    s.close()
-    return port
+    header("Compile")
+    print "+", " ".join(cmd)
+    process = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+                               stderr=subprocess.PIPE)
+    stdout, stderr = process.communicate()
+    if process.returncode:
+        print stdout,
+        print stderr,
+        header("")
+        raise Exception("Compile failed!")
 
 class Spike(object):
-    logname = "spike.log"
-
-    def __init__(self, cmd, binary=None, halted=False, with_gdb=True,
-            timeout=None, xlen=64):
+    def __init__(self, target, halted=False, timeout=None, with_jtag_gdb=True):
         """Launch spike. Return tuple of its process and the port it's running
         on."""
-        if cmd:
-            cmd = shlex.split(cmd)
+        self.process = None
+
+        if target.harts:
+            harts = target.harts
+        else:
+            harts = [target]
+
+        cmd = self.command(target, harts, halted, timeout, with_jtag_gdb)
+        self.infinite_loop = target.compile(harts[0],
+                "programs/checksum.c", "programs/tiny-malloc.c",
+                "programs/infinite_loop.S", "-DDEFINE_MALLOC", "-DDEFINE_FREE")
+        cmd.append(self.infinite_loop)
+        self.logfile = tempfile.NamedTemporaryFile(prefix="spike-",
+                suffix=".log")
+        self.logname = self.logfile.name
+        if print_log_names:
+            real_stdout.write("Temporary spike log: %s\n" % self.logname)
+        self.logfile.write("+ %s\n" % " ".join(cmd))
+        self.logfile.flush()
+        self.process = subprocess.Popen(cmd, stdin=subprocess.PIPE,
+                stdout=self.logfile, stderr=self.logfile)
+
+        if with_jtag_gdb:
+            self.port = None
+            for _ in range(30):
+                m = re.search(r"Listening for remote bitbang connection on "
+                        r"port (\d+).", open(self.logname).read())
+                if m:
+                    self.port = int(m.group(1))
+                    os.environ['REMOTE_BITBANG_PORT'] = m.group(1)
+                    break
+                time.sleep(0.11)
+            if not self.port:
+                print_log(self.logname)
+                raise Exception("Didn't get spike message about bitbang "
+                        "connection")
+
+    def command(self, target, harts, halted, timeout, with_jtag_gdb):
+        # pylint: disable=no-self-use
+        if target.sim_cmd:
+            cmd = shlex.split(target.sim_cmd)
         else:
-            cmd = ["spike"]
-        if xlen == 32:
-            cmd += ["--isa", "RV32"]
+            spike = os.path.expandvars("$RISCV/bin/spike")
+            cmd = [spike]
+
+        cmd += ["-p%d" % len(harts)]
+
+        assert len(set(t.xlen for t in harts)) == 1, \
+                "All spike harts must have the same XLEN"
+
+        if harts[0].xlen == 32:
+            cmd += ["--isa", "RV32G"]
+        else:
+            cmd += ["--isa", "RV64G"]
+
+        assert len(set(t.ram for t in harts)) == 1, \
+                "All spike harts must have the same RAM layout"
+        assert len(set(t.ram_size for t in harts)) == 1, \
+                "All spike harts must have the same RAM layout"
+        cmd += ["-m0x%x:0x%x" % (harts[0].ram, harts[0].ram_size)]
 
         if timeout:
             cmd = ["timeout", str(timeout)] + cmd
 
         if halted:
             cmd.append('-H')
-        if with_gdb:
-            self.port = unused_port()
-            cmd += ['--gdb-port', str(self.port)]
-        cmd.append("-m32")
-        cmd.append('pk')
-        if binary:
-            cmd.append(binary)
-        logfile = open(self.logname, "w")
-        logfile.write("+ %s\n" % " ".join(cmd))
-        logfile.flush()
-        self.process = subprocess.Popen(cmd, stdin=subprocess.PIPE,
-                stdout=logfile, stderr=logfile)
+        if with_jtag_gdb:
+            cmd += ['--rbb-port', '0']
+            os.environ['REMOTE_BITBANG_HOST'] = 'localhost'
+
+        return cmd
 
     def __del__(self):
-        try:
-            self.process.kill()
-            self.process.wait()
-        except OSError:
-            pass
+        if self.process:
+            try:
+                self.process.kill()
+                self.process.wait()
+            except OSError:
+                pass
 
     def wait(self, *args, **kwargs):
         return self.process.wait(*args, **kwargs)
 
 class VcsSim(object):
-    def __init__(self, simv=None, debug=False):
-        if simv:
-            cmd = shlex.split(simv)
+    logname = "simv.log"
+
+    def __init__(self, sim_cmd=None, debug=False):
+        if sim_cmd:
+            cmd = shlex.split(sim_cmd)
         else:
             cmd = ["simv"]
         cmd += ["+jtag_vpi_enable"]
         if debug:
             cmd[0] = cmd[0] + "-debug"
             cmd += ["+vcdplusfile=output/gdbserver.vpd"]
-        logfile = open("simv.log", "w")
+        logfile = open(self.logname, "w")
         logfile.write("+ %s\n" % " ".join(cmd))
         logfile.flush()
-        listenfile = open("simv.log", "r")
+        listenfile = open(self.logname, "r")
         listenfile.seek(0, 2)
         self.process = subprocess.Popen(cmd, stdin=subprocess.PIPE,
                 stdout=logfile, stderr=logfile)
         done = False
         while not done:
+            # Fail if VCS exits early
+            exit_code = self.process.poll()
+            if exit_code is not None:
+                raise RuntimeError('VCS simulator exited early with status %d'
+                                   % exit_code)
+
             line = listenfile.readline()
             if not line:
                 time.sleep(1)
-            if "Listening on port 5555" in line:
+            match = re.match(r"^Listening on port (\d+)$", line)
+            if match:
                 done = True
+                self.port = int(match.group(1))
+                os.environ['JTAG_VPI_PORT'] = str(self.port)
 
     def __del__(self):
         try:
@@ -113,91 +185,311 @@ class VcsSim(object):
             pass
 
 class Openocd(object):
-    logname = "openocd.log"
-
-    def __init__(self, cmd=None, config=None, debug=False, otherProcess=None):
+    logfile = tempfile.NamedTemporaryFile(prefix='openocd', suffix='.log')
+    logname = logfile.name
 
-        # keep handles to other processes -- don't let them be
-        # garbage collected yet.
+    def __init__(self, server_cmd=None, config=None, debug=False, timeout=60):
+        self.timeout = timeout
 
-        self.otherProcess = otherProcess
-        if cmd:
-            cmd = shlex.split(cmd)
+        if server_cmd:
+            cmd = shlex.split(server_cmd)
         else:
-            cmd = ["openocd"]
+            openocd = os.path.expandvars("$RISCV/bin/openocd")
+            cmd = [openocd]
+            if debug:
+                cmd.append("-d")
+
+        # This command needs to come before any config scripts on the command
+        # line, since they are executed in order.
+        cmd += [
+            # Tell OpenOCD to bind gdb to an unused, ephemeral port.
+            "--command",
+            "gdb_port 0",
+            # Disable tcl and telnet servers, since they are unused and because
+            # the port numbers will conflict if multiple OpenOCD processes are
+            # running on the same server.
+            "--command",
+            "tcl_port disabled",
+            "--command",
+            "telnet_port disabled",
+        ]
+
         if config:
-            cmd += ["-f", find_file(config)]
+            f = find_file(config)
+            if f is None:
+                print "Unable to read file " + config
+                exit(1)
+
+            cmd += ["-f", f]
         if debug:
             cmd.append("-d")
+
         logfile = open(Openocd.logname, "w")
+        if print_log_names:
+            real_stdout.write("Temporary OpenOCD log: %s\n" % Openocd.logname)
         logfile.write("+ %s\n" % " ".join(cmd))
         logfile.flush()
-        self.process = subprocess.Popen(cmd, stdin=subprocess.PIPE,
+
+        self.gdb_ports = []
+        self.process = self.start(cmd, logfile)
+
+    def start(self, cmd, logfile):
+        process = subprocess.Popen(cmd, stdin=subprocess.PIPE,
                 stdout=logfile, stderr=logfile)
-        # TODO: Pick a random port
-        self.port = 3333
+
+        try:
+            # Wait for OpenOCD to have made it through riscv_examine(). When
+            # using OpenOCD to communicate with a simulator this may take a
+            # long time, and gdb will time out when trying to connect if we
+            # attempt too early.
+            start = time.time()
+            messaged = False
+            fd = open(Openocd.logname, "r")
+            while True:
+                line = fd.readline()
+                if not line:
+                    if not process.poll() is None:
+                        raise Exception("OpenOCD exited early.")
+                    time.sleep(0.1)
+                    continue
+
+                m = re.search(r"Listening on port (\d+) for gdb connections",
+                        line)
+                if m:
+                    self.gdb_ports.append(int(m.group(1)))
+
+                if "telnet server disabled" in line:
+                    return process
+
+                if not messaged and time.time() - start > 1:
+                    messaged = True
+                    print "Waiting for OpenOCD to start..."
+                if (time.time() - start) > self.timeout:
+                    raise Exception("Timed out waiting for OpenOCD to "
+                            "listen for gdb")
+
+        except Exception:
+            print_log(Openocd.logname)
+            raise
 
     def __del__(self):
         try:
             self.process.kill()
             self.process.wait()
-        except OSError:
+        except (OSError, AttributeError):
             pass
 
+class OpenocdCli(object):
+    def __init__(self, port=4444):
+        self.child = pexpect.spawn(
+                "sh -c 'telnet localhost %d | tee openocd-cli.log'" % port)
+        self.child.expect("> ")
+
+    def command(self, cmd):
+        self.child.sendline(cmd)
+        self.child.expect(cmd)
+        self.child.expect("\n")
+        self.child.expect("> ")
+        return self.child.before.strip("\t\r\n \0")
+
+    def reg(self, reg=''):
+        output = self.command("reg %s" % reg)
+        matches = re.findall(r"(\w+) \(/\d+\): (0x[0-9A-F]+)", output)
+        values = {r: int(v, 0) for r, v in matches}
+        if reg:
+            return values[reg]
+        return values
+
+    def load_image(self, image):
+        output = self.command("load_image %s" % image)
+        if 'invalid ELF file, only 32bits files are supported' in output:
+            raise TestNotApplicable(output)
+
 class CannotAccess(Exception):
     def __init__(self, address):
         Exception.__init__(self)
         self.address = address
 
+Thread = collections.namedtuple('Thread', ('id', 'description', 'target_id',
+    'name', 'frame'))
+
 class Gdb(object):
-    def __init__(self,
-            cmd=os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gdb")):
-        self.child = pexpect.spawn(cmd)
-        self.child.logfile = open("gdb.log", "w")
-        self.child.logfile.write("+ %s\n" % cmd)
-        self.wait()
-        self.command("set confirm off")
-        self.command("set width 0")
-        self.command("set height 0")
-        # Force consistency.
-        self.command("set print entry-values no")
+    """A single gdb class which can interact with one or more gdb instances."""
+
+    # pylint: disable=too-many-public-methods
+    # pylint: disable=too-many-instance-attributes
+
+    def __init__(self, ports,
+            cmd=os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gdb"),
+            timeout=60, binary=None):
+        assert ports
+
+        self.ports = ports
+        self.cmd = cmd
+        self.timeout = timeout
+        self.binary = binary
+
+        self.stack = []
+        self.harts = {}
+
+        self.logfiles = []
+        self.children = []
+        for port in ports:
+            logfile = tempfile.NamedTemporaryFile(prefix="gdb@%d-" % port,
+                    suffix=".log")
+            self.logfiles.append(logfile)
+            if print_log_names:
+                real_stdout.write("Temporary gdb log: %s\n" % logfile.name)
+            child = pexpect.spawn(cmd)
+            child.logfile = logfile
+            child.logfile.write("+ %s\n" % cmd)
+            self.children.append(child)
+        self.active_child = self.children[0]
+
+    def connect(self):
+        for port, child in zip(self.ports, self.children):
+            self.select_child(child)
+            self.wait()
+            self.command("set confirm off")
+            self.command("set width 0")
+            self.command("set height 0")
+            # Force consistency.
+            self.command("set print entry-values no")
+            self.command("set remotetimeout %d" % self.timeout)
+            self.command("target extended-remote localhost:%d" % port)
+            if self.binary:
+                self.command("file %s" % self.binary)
+            threads = self.threads()
+            for t in threads:
+                hartid = None
+                if t.name:
+                    m = re.search(r"Hart (\d+)", t.name)
+                    if m:
+                        hartid = int(m.group(1))
+                if hartid is None:
+                    if self.harts:
+                        hartid = max(self.harts) + 1
+                    else:
+                        hartid = 0
+                self.harts[hartid] = (child, t)
+
+    def __del__(self):
+        for child in self.children:
+            del child
+
+    def lognames(self):
+        return [logfile.name for logfile in self.logfiles]
+
+    def select_child(self, child):
+        self.active_child = child
+
+    def select_hart(self, hart):
+        child, thread = self.harts[hart.id]
+        self.select_child(child)
+        output = self.command("thread %s" % thread.id)
+        assert "Unknown" not in output
+
+    def push_state(self):
+        self.stack.append({
+            'active_child': self.active_child
+            })
+
+    def pop_state(self):
+        state = self.stack.pop()
+        self.active_child = state['active_child']
 
     def wait(self):
         """Wait for prompt."""
-        self.child.expect(r"\(gdb\)")
+        self.active_child.expect(r"\(gdb\)")
+
+    def command(self, command, timeout=6000):
+        """timeout is in seconds"""
+        self.active_child.sendline(command)
+        self.active_child.expect("\n", timeout=timeout)
+        self.active_child.expect(r"\(gdb\)", timeout=timeout)
+        return self.active_child.before.strip()
 
-    def command(self, command, timeout=-1):
-        self.child.sendline(command)
-        self.child.expect("\n", timeout=timeout)
-        self.child.expect(r"\(gdb\)", timeout=timeout)
-        return self.child.before.strip()
+    def global_command(self, command):
+        """Execute this command on every gdb that we control."""
+        with PrivateState(self):
+            for child in self.children:
+                self.select_child(child)
+                self.command(command)
 
-    def c(self, wait=True):
+    def c(self, wait=True, timeout=-1, async=False):
+        """
+        Dumb c command.
+        In RTOS mode, gdb will resume all harts.
+        In multi-gdb mode, this command will just go to the current gdb, so
+        will only resume one hart.
+        """
+        if async:
+            async = "&"
+        else:
+            async = ""
         if wait:
-            output = self.command("c")
+            output = self.command("c%s" % async, timeout=timeout)
             assert "Continuing" in output
             return output
         else:
-            self.child.sendline("c")
-            self.child.expect("Continuing")
+            self.active_child.sendline("c%s" % async)
+            self.active_child.expect("Continuing")
+
+    def c_all(self):
+        """
+        Resume every hart.
+
+        This function works fine when using multiple gdb sessions, but the
+        caller must be careful when using it nonetheless. gdb's behavior is to
+        not set breakpoints until just before the hart is resumed, and then
+        clears them as soon as the hart halts. That means that you can't set
+        one software breakpoint, and expect multiple harts to hit it. It's
+        possible that the first hart completes set/run/halt/clear before the
+        second hart even gets to resume, so it will never hit the breakpoint.
+        """
+        with PrivateState(self):
+            for child in self.children:
+                child.sendline("c")
+                child.expect("Continuing")
+
+            # Now wait for them all to halt
+            for child in self.children:
+                child.expect(r"\(gdb\)")
 
     def interrupt(self):
-        self.child.send("\003")
-        self.child.expect(r"\(gdb\)", timeout=60)
-        return self.child.before.strip()
+        self.active_child.send("\003")
+        self.active_child.expect(r"\(gdb\)", timeout=6000)
+        return self.active_child.before.strip()
 
     def x(self, address, size='w'):
         output = self.command("x/%s %s" % (size, address))
         value = int(output.split(':')[1].strip(), 0)
         return value
 
-    def p(self, obj):
-        output = self.command("p/x %s" % obj)
+    def p_raw(self, obj):
+        output = self.command("p %s" % obj)
         m = re.search("Cannot access memory at address (0x[0-9a-f]+)", output)
         if m:
             raise CannotAccess(int(m.group(1), 0))
-        value = int(output.split('=')[-1].strip(), 0)
-        return value
+        return output.split('=')[-1].strip()
+
+    def parse_string(self, text):
+        text = text.strip()
+        if text.startswith("{") and text.endswith("}"):
+            inner = text[1:-1]
+            return [self.parse_string(t) for t in inner.split(", ")]
+        elif text.startswith('"') and text.endswith('"'):
+            return text[1:-1]
+        else:
+            return int(text, 0)
+
+    def p(self, obj, fmt="/x"):
+        output = self.command("p%s %s" % (fmt, obj))
+        m = re.search("Cannot access memory at address (0x[0-9a-f]+)", output)
+        if m:
+            raise CannotAccess(int(m.group(1), 0))
+        rhs = output.split('=')[-1]
+        return self.parse_string(rhs)
 
     def p_string(self, obj):
         output = self.command("p %s" % obj)
@@ -205,11 +497,11 @@ class Gdb(object):
         return value
 
     def stepi(self):
-        output = self.command("stepi")
+        output = self.command("stepi", timeout=60)
         return output
 
     def load(self):
-        output = self.command("load", timeout=60)
+        output = self.command("load", timeout=6000)
         assert "failed" not in  output
         assert "Transfer rate" in output
 
@@ -224,3 +516,375 @@ class Gdb(object):
         assert "not defined" not in output
         assert "Hardware assisted breakpoint" in output
         return output
+
+    def threads(self):
+        output = self.command("info threads")
+        threads = []
+        for line in output.splitlines():
+            m = re.match(
+                    r"[\s\*]*(\d+)\s*"
+                    r"(Remote target|Thread (\d+)\s*\(Name: ([^\)]+))"
+                    r"\s*(.*)", line)
+            if m:
+                threads.append(Thread(*m.groups()))
+        assert threads
+        #>>>if not threads:
+        #>>>    threads.append(Thread('1', '1', 'Default', '???'))
+        return threads
+
+    def thread(self, thread):
+        return self.command("thread %s" % thread.id)
+
+    def where(self):
+        return self.command("where 1")
+
+class PrivateState(object):
+    def __init__(self, gdb):
+        self.gdb = gdb
+
+    def __enter__(self):
+        self.gdb.push_state()
+
+    def __exit__(self, _type, _value, _traceback):
+        self.gdb.pop_state()
+
+def run_all_tests(module, target, parsed):
+    if not os.path.exists(parsed.logs):
+        os.makedirs(parsed.logs)
+
+    overall_start = time.time()
+
+    global gdb_cmd  # pylint: disable=global-statement
+    gdb_cmd = parsed.gdb
+
+    todo = []
+    examine_added = False
+    for hart in target.harts:
+        if parsed.misaval:
+            hart.misa = int(parsed.misaval, 16)
+            print "Using $misa from command line: 0x%x" % hart.misa
+        elif hart.misa:
+            print "Using $misa from hart definition: 0x%x" % hart.misa
+        elif not examine_added:
+            todo.append(("ExamineTarget", ExamineTarget, None))
+            examine_added = True
+
+    for name in dir(module):
+        definition = getattr(module, name)
+        if isinstance(definition, type) and hasattr(definition, 'test') and \
+                (not parsed.test or any(test in name for test in parsed.test)):
+            todo.append((name, definition, None))
+
+    results, count = run_tests(parsed, target, todo)
+
+    header("ran %d tests in %.0fs" % (count, time.time() - overall_start),
+            dash=':')
+
+    return print_results(results)
+
+good_results = set(('pass', 'not_applicable'))
+def run_tests(parsed, target, todo):
+    results = {}
+    count = 0
+
+    for name, definition, hart in todo:
+        log_name = os.path.join(parsed.logs, "%s-%s-%s.log" %
+                (time.strftime("%Y%m%d-%H%M%S"), type(target).__name__, name))
+        log_fd = open(log_name, 'w')
+        print "[%s] Starting > %s" % (name, log_name)
+        instance = definition(target, hart)
+        sys.stdout.flush()
+        log_fd.write("Test: %s\n" % name)
+        log_fd.write("Target: %s\n" % type(target).__name__)
+        start = time.time()
+        global real_stdout  # pylint: disable=global-statement
+        real_stdout = sys.stdout
+        sys.stdout = log_fd
+        try:
+            result = instance.run()
+            log_fd.write("Result: %s\n" % result)
+        finally:
+            sys.stdout = real_stdout
+            log_fd.write("Time elapsed: %.2fs\n" % (time.time() - start))
+        print "[%s] %s in %.2fs" % (name, result, time.time() - start)
+        if result not in good_results and parsed.print_failures:
+            sys.stdout.write(open(log_name).read())
+        sys.stdout.flush()
+        results.setdefault(result, []).append((name, log_name))
+        count += 1
+        if result not in good_results and parsed.fail_fast:
+            break
+
+    return results, count
+
+def print_results(results):
+    result = 0
+    for key, value in results.iteritems():
+        print "%d tests returned %s" % (len(value), key)
+        if key not in good_results:
+            result = 1
+            for name, log_name in value:
+                print "   %s > %s" % (name, log_name)
+
+    return result
+
+def add_test_run_options(parser):
+    parser.add_argument("--logs", default="logs",
+            help="Store logs in the specified directory.")
+    parser.add_argument("--fail-fast", "-f", action="store_true",
+            help="Exit as soon as any test fails.")
+    parser.add_argument("--print-failures", action="store_true",
+            help="When a test fails, print the log file to stdout.")
+    parser.add_argument("--print-log-names", "--pln", action="store_true",
+            help="Print names of temporary log files as soon as they are "
+            "created.")
+    parser.add_argument("test", nargs='*',
+            help="Run only tests that are named here.")
+    parser.add_argument("--gdb",
+            help="The command to use to start gdb.")
+    parser.add_argument("--misaval",
+            help="Don't run ExamineTarget, just assume the misa value which is "
+            "specified.")
+
+def header(title, dash='-', length=78):
+    if title:
+        dashes = dash * (length - 4 - len(title))
+        before = dashes[:len(dashes)/2]
+        after = dashes[len(dashes)/2:]
+        print "%s[ %s ]%s" % (before, title, after)
+    else:
+        print dash * length
+
+def print_log(path):
+    header(path)
+    for l in open(path, "r"):
+        sys.stdout.write(l)
+    print
+
+class BaseTest(object):
+    compiled = {}
+
+    def __init__(self, target, hart=None):
+        self.target = target
+        if hart:
+            self.hart = hart
+        else:
+            self.hart = random.choice(target.harts)
+            self.hart = target.harts[-1]    #<<<
+        self.server = None
+        self.target_process = None
+        self.binary = None
+        self.start = 0
+        self.logs = []
+
+    def early_applicable(self):
+        """Return a false value if the test has determined it cannot run
+        without ever needing to talk to the target or server."""
+        # pylint: disable=no-self-use
+        return True
+
+    def setup(self):
+        pass
+
+    def compile(self):
+        compile_args = getattr(self, 'compile_args', None)
+        if compile_args:
+            if compile_args not in BaseTest.compiled:
+                BaseTest.compiled[compile_args] = \
+                        self.target.compile(self.hart, *compile_args)
+        self.binary = BaseTest.compiled.get(compile_args)
+
+    def classSetup(self):
+        self.compile()
+        self.target_process = self.target.create()
+        if self.target_process:
+            self.logs.append(self.target_process.logname)
+        try:
+            self.server = self.target.server()
+            self.logs.append(self.server.logname)
+        except Exception:
+            for log in self.logs:
+                print_log(log)
+            raise
+
+    def classTeardown(self):
+        del self.server
+        del self.target_process
+
+    def postMortem(self):
+        pass
+
+    def run(self):
+        """
+        If compile_args is set, compile a program and set self.binary.
+
+        Call setup().
+
+        Then call test() and return the result, displaying relevant information
+        if an exception is raised.
+        """
+
+        sys.stdout.flush()
+
+        if not self.early_applicable():
+            return "not_applicable"
+
+        self.start = time.time()
+
+        try:
+            self.classSetup()
+            self.setup()
+            result = self.test()    # pylint: disable=no-member
+        except TestNotApplicable:
+            result = "not_applicable"
+        except Exception as e: # pylint: disable=broad-except
+            if isinstance(e, TestFailed):
+                result = "fail"
+            else:
+                result = "exception"
+            if isinstance(e, TestFailed):
+                header("Message")
+                print e.message
+            header("Traceback")
+            traceback.print_exc(file=sys.stdout)
+            try:
+                self.postMortem()
+            except Exception as e:  # pylint: disable=broad-except
+                header("postMortem Exception")
+                print e
+                traceback.print_exc(file=sys.stdout)
+            return result
+
+        finally:
+            for log in self.logs:
+                print_log(log)
+            header("End of logs")
+            self.classTeardown()
+
+        if not result:
+            result = 'pass'
+        return result
+
+gdb_cmd = None
+class GdbTest(BaseTest):
+    def __init__(self, target, hart=None):
+        BaseTest.__init__(self, target, hart=hart)
+        self.gdb = None
+
+    def classSetup(self):
+        BaseTest.classSetup(self)
+
+        if gdb_cmd:
+            self.gdb = Gdb(self.server.gdb_ports, gdb_cmd,
+                    timeout=self.target.timeout_sec, binary=self.binary)
+        else:
+            self.gdb = Gdb(self.server.gdb_ports,
+                    timeout=self.target.timeout_sec, binary=self.binary)
+
+        self.logs += self.gdb.lognames()
+        self.gdb.connect()
+
+        self.gdb.global_command("set arch riscv:rv%d" % self.hart.xlen)
+        self.gdb.global_command("set remotetimeout %d" %
+            self.target.timeout_sec)
+
+        for cmd in self.target.gdb_setup:
+            self.gdb.command(cmd)
+
+        self.gdb.select_hart(self.hart)
+
+        # FIXME: OpenOCD doesn't handle PRIV now
+        #self.gdb.p("$priv=3")
+
+    def postMortem(self):
+        if not self.gdb:
+            return
+        self.gdb.interrupt()
+        self.gdb.command("info registers all", timeout=10)
+
+    def classTeardown(self):
+        del self.gdb
+        BaseTest.classTeardown(self)
+
+class GdbSingleHartTest(GdbTest):
+    def classSetup(self):
+        GdbTest.classSetup(self)
+
+        for hart in self.target.harts:
+            # Park all harts that we're not using in a safe place.
+            if hart != self.hart:
+                self.gdb.select_hart(hart)
+                self.gdb.p("$pc=loop_forever")
+        self.gdb.select_hart(self.hart)
+
+class ExamineTarget(GdbTest):
+    def test(self):
+        for hart in self.target.harts:
+            self.gdb.select_hart(hart)
+
+            hart.misa = self.gdb.p("$misa")
+
+            txt = "RV"
+            misa_xlen = 0
+            if ((hart.misa & 0xFFFFFFFF) >> 30) == 1:
+                misa_xlen = 32
+            elif ((hart.misa & 0xFFFFFFFFFFFFFFFF) >> 62) == 2:
+                misa_xlen = 64
+            elif ((hart.misa & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) >> 126) == 3:
+                misa_xlen = 128
+            else:
+                raise TestFailed("Couldn't determine XLEN from $misa (0x%x)" %
+                        self.hart.misa)
+
+            if misa_xlen != hart.xlen:
+                raise TestFailed("MISA reported XLEN of %d but we were "\
+                        "expecting XLEN of %d\n" % (misa_xlen, hart.xlen))
+
+            txt += ("%d" % misa_xlen)
+
+            for i in range(26):
+                if hart.misa & (1<<i):
+                    txt += chr(i + ord('A'))
+            print txt,
+
+class TestFailed(Exception):
+    def __init__(self, message):
+        Exception.__init__(self)
+        self.message = message
+
+class TestNotApplicable(Exception):
+    def __init__(self, message):
+        Exception.__init__(self)
+        self.message = message
+
+def assertEqual(a, b):
+    if a != b:
+        raise TestFailed("%r != %r" % (a, b))
+
+def assertNotEqual(a, b):
+    if a == b:
+        raise TestFailed("%r == %r" % (a, b))
+
+def assertIn(a, b):
+    if a not in b:
+        raise TestFailed("%r not in %r" % (a, b))
+
+def assertNotIn(a, b):
+    if a in b:
+        raise TestFailed("%r in %r" % (a, b))
+
+def assertGreater(a, b):
+    if not a > b:
+        raise TestFailed("%r not greater than %r" % (a, b))
+
+def assertLess(a, b):
+    if not a < b:
+        raise TestFailed("%r not less than %r" % (a, b))
+
+def assertTrue(a):
+    if not a:
+        raise TestFailed("%r is not True" % a)
+
+def assertRegexpMatches(text, regexp):
+    if not re.search(regexp, text):
+        raise TestFailed("can't find %r in %r" % (regexp, text))