diff --git a/utils/addrsource b/utils/addrsource
new file mode 100755
index 0000000..8570cae
--- /dev/null
+++ b/utils/addrsource
@@ -0,0 +1,48 @@
+#!/bin/bash
+#
+# addrsource <addr> [<filename>]
+#
+# Given a memory address (in hex), print (if available) the C source code line
+# and disassembly associated with that address.
+#
+# <filename>, if provided, should be the name of the ELF (*.out) file for the
+# firmware image (typically located in the "build" subdirectory).  If
+# <filename> is not provided, the script will look for a "build" subdirectory
+# of the current directory, and look in there for a filename matching "*.out"
+# and use that.
+
+print_usage() {
+    echo "Usage: $0 addr [file.out]" >&2
+}
+
+addr="$1"
+exefile="$2"
+
+# If user didn't provide any parameters, or attempted to use a switch (such as
+# "--help"), just print the usage message and exit.  If they provided an 'addr'
+# parameter, but it didn't start with "0x", then prepend "0x" to it before
+# continuing..
+case "$addr" in
+    "") print_usage; exit 1 ;;
+    -*) print_usage; exit 1 ;;
+    0x*) ;;
+    *) addr="0x$addr" ;;
+esac
+
+if [[ -z "$exefile" ]]; then
+    # User didn't specify what ELF (.out) file to look things up in.
+    # See if we can find an appropriate .out file in the build subdirectory
+    # (there's usually only one)
+    exefile=$(ls build/*.out)
+    if [[ -z "$exefile" ]] || [[ "${exefile#* }" != "$exefile" ]]; then
+        # Either we couldn't find anything, or we found more than one of them.
+        echo "Unable to determine which .out file to use.  You will need to specify it explicitly on the command line." >&2
+        echo "" >&2
+        print_usage
+        exit 1
+    fi
+fi
+
+# All our parameters should be correct now.
+# Invoke GDB to do the hard work for us...
+xtensa-lx106-elf-gdb -batch "$exefile" -ex "list *$addr" -ex "info line *$addr" -ex "disassemble $addr"