On Thu, Jun 13, 2019 at 08:21:03AM -0500, Josh Poimboeuf wrote: > The BPF JIT code clobbers RBP. This breaks frame pointer convention and > thus prevents the FP unwinder from unwinding through JIT generated code. > > RBP is currently used as the BPF stack frame pointer register. The > actual register used is opaque to the user, as long as it's a > callee-saved register. Change it to use R12 instead. Could you maintain the system %rbp chain through the BPF stack? It might even be possible to put something relevant in the %rip location. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
