Re: [PATCH v3 0/1] MR8466: ntdll: Also restore rbp before calling user mode callback.

[Paul Gofman (＠gofman)]

Which exact unwinding do you mean, PE side Wine implemented (probably?), or something Unix side?

rbp has no special meaning on x64, it is just one of non-volatile register. If it is not properly restored during PE unwind, it is probably the same as many other non-volatile registers as well (e. g, r12, xmm6)? Then all of those should probably be restored. I'd guess that yeah, call_user_mode_callback() might be the only place for it because there is no context saved in callback_stack_layout (unlike exception_stack_layout or apc_stack_layout). But you probably don't need to pass any of those registers to restore to call_user_mode_callback() and can just use those from frame (including FP state probably).