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SubjectRe: [RFC][PATCH] objtool,ftrace: Implement UNWIND_HINT_RET_OFFSET
On Tue, Mar 31, 2020 at 04:17:58PM -0500, Josh Poimboeuf wrote:
> > I'm not against adding a second/separate hint for this. In fact, I
> > almost considered teaching objtool how to interpret the whole IRET frame
> > so that we can do it without hints. It's just that that's too much code
> > for this one case.
> >
> Despite my earlier complaint about stack size knowledge, we could just
> forget the hint and make "iretq in C code" equivalent to "reduce stack
> size by arch_exception_stack_size()" and keep going. There's
> file->c_file which tells you it's a C file.

Or maybe "iretq in an STT_FUNC" is better since this pattern could
presumably happen in a callable asm function.


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