https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117267
--- Comment #13 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Stas Sergeev from comment #12) > Well I can move %rsp with an > inline asm to some pre-defined > buffer before recovering regs > with swapcontext. Or I can manually > adjust it in jmpbuf, in which case > I won't be on a wrong stack even > temporarily. Although I suspect > you are going to declare both > things an UB anyway. :) swapcontext itself might be valid but I doubt it if you going to change the stack pointer in an odd way. Adjusting the jumpbuf is also will be undefined. on the subject of inline-asm, see PR 11807 too.
