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

From: Luca
Subject: Re: [PATCH 3/6] fix register corruption in irq on qemu
Date: Wed, 2 Feb 2022 09:20:52 +0100

Il 02/02/22 08:46, Samuel Thibault ha scritto:
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

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.

Ah ok :) yes you're right, I have to admit I didn't notice ebx was used below.


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