From b987b4141281c6e4922923c82ca972f71479ab46 Mon Sep 17 00:00:00 2001
From: Zach Riggle <riggle@google.com>
Date: Thu, 9 Jun 2016 20:58:27 -0600
Subject: [PATCH] Work around loud exception for GDB 7.7 which may cause wrong
 arch to be used

---
 pwndbg/arch.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pwndbg/arch.py b/pwndbg/arch.py
index 48c6bb794..8d2f92bbe 100644
--- a/pwndbg/arch.py
+++ b/pwndbg/arch.py
@@ -29,7 +29,16 @@ def fix_arch(arch):
 def update():
     m = sys.modules[__name__]
 
-    m.current = fix_arch(gdb.selected_frame().architecture().name())
+    # GDB 7.7 (Ubuntu Trusty) does not like selected_frame() when EBP/RBP
+    # is not mapped / pounts to an invalid address.
+    #
+    # As a work-around for Trusty users, handle the exception and bail.
+    # This may lead to inaccurate results, but there's not much to be done.
+    try:
+        m.current = fix_arch(gdb.newest_frame().architecture().name())
+    except Exception:
+        return
+
     m.ptrsize = pwndbg.typeinfo.ptrsize
     m.ptrmask = (1 << 8*pwndbg.typeinfo.ptrsize)-1