The objdump.el code here provides some simple support for disassembling an executable or object file with GNU objdump and browsing the result. (The "disassemble" command in Emacs is already used for examining byte code.) There are only a couple of interesting key bindings: "g" will re-run the objdump command in case you've recompiled, and "s" will prompt for a symbolic address, which can be of the