On Tue, Sep 15, 2020 at 10:49:12PM +0200, Borislav Petkov wrote: > > (Btw, clang doesn't need to add that "xor %eax,%eax" - panic() should not be > returning, ever. :-)) >
I think this is because panic() is varargs, and clang doesn't support gcc's -mskip-rax-setup. The normal ABI requires the caller to set RAX to the number of arguments in vector registers. https://patchwork.ozlabs.org/project/gcc/patch/20141218131150.ga32...@intel.com/
