https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70220
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Wink Saville from comment #7) > > In my opinion, even if rbp is special, it still needs to be available in the > struct full_stack_frame. The whole idea of extending interrupter attribute is to avoid full_stack_frame. ISR shouldn't assume that compiler will save and restore registers in any specific way, order or form. As far as ISR is concerned, it is just black magic. > Also, isn't rsp special? Would the compiler or programmer be responsible for > initializing it. It seems to me it has to be the compiler, but could be > wrong. If you change rsp in asm statement, you have to restore it in asm statement.
