Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions

[Peter Zijlstra]

On Thu, May 02, 2019 at 06:21:33PM +0200, Peter Zijlstra wrote:
> Much thanks to Joerg Roedel for talking entry_32.S with me.
> 
> TL;DR, on x86_32 kernel->kernel IRET frames are only 3 entries and do
> not include ESP/SS, so not only wasn't regs->sp setup, if you changed it
> it wouldn't be effective and corrupt random stack state.

Also, i386 is bloody insane...