Fix up some Python2 regressions

pwndbg/commands/start.py

@@ -33,17 +33,21 @@ def start(*a):
                 "start",
                 "_start",
                 "init",
-                "_init",
-                pwndbg.elf.entry()]
+                "_init"]
 
-    for address in filter(bool, map(pwndbg.symbol.address, symbols)):
-        if address:
-            b = gdb.Breakpoint('*%#x' % address, temporary=True)
-            gdb.execute(run, from_tty=False, to_string=True)
-            break
+    # Try a symbolic breakpoint which GDB will automatically update.
+    symbols = {s:pwndbg.symbol.address(s) for s in symbols}
 
-    else:
-        entry(*a)
+    for name, address in symbols.items():
+        if not address:
+            continue
+
+        b = gdb.Breakpoint(name, temporary=True)
+        gdb.execute(run, from_tty=False, to_string=True)
+        return
+
+    # Try a breakpoint at the binary entry
+    entry(*a)
 
 
 @pwndbg.commands.Command

pwndbg/memoize.py

@@ -24,7 +24,7 @@ class memoize(object):
         self.caches.append(self)
         functools.update_wrapper(self, func)
 
-    def __call__(self, *args):
+    def __call__(self, *args, **kwargs):
         how = None
 
         if not isinstance(args, collections.Hashable):
@@ -38,7 +38,7 @@ class memoize(object):
 
         else:
             how   = "Executed"
-            value = self.func(*args)
+            value = self.func(*args, **kwargs)
             self.cache[args] = value
 
             if isinstance(value, list):

pwndbg/stdio.py

@@ -5,12 +5,18 @@ which prevent output from appearing on-screen inside of certain event handlers.
 import gdb
 import io
 import sys
+import pwndbg.compat
 
 debug = True
 
 def get(fd, mode):
     file = io.open(1, mode=mode, buffering=0, closefd=False)
-    return io.TextIOWrapper(file, write_through=True)
+
+    kw = {}
+    if pwndbg.compat.python3:
+        kw['write_through']=True
+
+    return io.TextIOWrapper(file, **kw)
 
 if debug:
     sys.stdin  = get(0, 'rb')

pwndbg/symbol.py

@@ -17,7 +17,7 @@ import pwndbg.stack
 import pwndbg.vmmap
 
 @pwndbg.memoize.reset_on_objfile
-def get(address):
+def get(address, gdb_only=False):
     """
     Retrieve the textual name for a symbol
     """
@@ -32,7 +32,7 @@ def get(address):
     # This sucks, but there's not a GDB API for this.
     result = gdb.execute('info symbol %#x' % int(address), to_string=True, from_tty=False)
 
-    if result.startswith('No symbol'):
+    if not gdb_only and result.startswith('No symbol'):
         address = int(address)
         exe     = pwndbg.elf.exe()
         if exe:
@@ -65,6 +65,7 @@ def address(symbol):
         result = gdb.execute('info address %s' % symbol, to_string=True, from_tty=False)
         result = result.split()
         address = next(r for r in result if r.startswith('0x'))
+        address = address.rstrip('.')
         return int(address, 0)
     except gdb.error:
         return None