Re: [PATCH 3/6] fix register corruption in irq on qemu

[Samuel Thibault]

Luca, le mer. 02 févr. 2022 08:15:05 +0100, a ecrit:
> Il 28/01/22 20:57, Samuel Thibault ha scritto:
> > Luca Dariz, le ven. 28 janv. 2022 19:24:06 +0100, a ecrit:
> > > it seems rbx is corrupted during interrupt handlers.
> > 
> > Perhaps just use rcx instead?
> 
> I'm not sure what causes this corruption, according do x86_64 calling
> conventions rbx should be preserved across function calls, so maybe the
> problem lies elsewhere.
> 
> Anyway, rcx is not preserved, so it should be pushed here indeed, I'll add
> it.

That's not what I meant :) I meant to *use* ecx instead of ebx, in the
computation. Since ecx is already clobbered below, after the call.

Registers are already saved by all_intrs etc. before calling the
interrupt asm function.

Samuel