All of lore.kernel.org
 help / color / mirror / Atom feed
From: Paolo Bonzini <pbonzini@redhat.com>
To: "Hervé Poussineau" <hpoussin@reactos.org>,
	"Richard Henderson" <rth@twiddle.net>,
	qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 4/7] target-i386: Dump illegal opcodes with -d unimp
Date: Thu, 3 Mar 2016 11:08:44 +0100	[thread overview]
Message-ID: <56D80D2C.3060706@redhat.com> (raw)
In-Reply-To: <56D7E054.2040703@reactos.org>

> Do you want LOG_UNIMP or LOG_GUEST_ERROR? 

I would actually use LOG_IN_ASM.  As you noticed, guests sometimes use
illegal opcodes; another example is Xen's hypercall interface.

On 03/03/2016 07:57, Hervé Poussineau wrote:
> This patch is not quiet on some operating systems:
> OS/2:
> ILLOPC: 000172e1: 0f a6
> 
> Windows XP:
> ILLOPC: 00020d1a: c4 c4
> 
> And very verbose in Windows 3.11, Windows 9x:
> ILLOPC: 000ffb17: 63
> ILLOPC: 000ffb17: 63
> 
> Is it normal?

Yes, it is.  As usual, Raymond Chen explains what's going on:

https://blogs.msdn.microsoft.com/oldnewthing/20041215-00/?p=37003

Alternatively, you can buy Unauthorized Windows 95 on Amazon for about
10 euros.  Which of course I just did. :)

Paolo

  reply	other threads:[~2016-03-03 10:08 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-03  5:30 [Qemu-devel] [PATCH 0/7] target-i386 fixes Richard Henderson
2016-03-03  5:30 ` [Qemu-devel] [PATCH 1/7] target-i386: avoid repeated calls to the bnd_jmp helper Richard Henderson
2016-03-03  5:30 ` [Qemu-devel] [PATCH 2/7] target-i386: fix smsw and lmsw from/to register Richard Henderson
2016-03-03  5:30 ` [Qemu-devel] [PATCH 3/7] target-i386: Fix SMSW for 64-bit mode Richard Henderson
2016-03-03  5:30 ` [Qemu-devel] [PATCH 4/7] target-i386: Dump illegal opcodes with -d unimp Richard Henderson
2016-03-03  6:57   ` Hervé Poussineau
2016-03-03 10:08     ` Paolo Bonzini [this message]
2016-03-03 19:06       ` Richard Henderson
2016-03-04 10:41         ` Paolo Bonzini
2016-03-04 18:12           ` Richard Henderson
2016-03-04 12:15         ` Paolo Bonzini
2016-03-03  5:30 ` [Qemu-devel] [PATCH 5/7] target-i386: fix addr16 prefix Richard Henderson
2016-03-03  5:30 ` [Qemu-devel] [PATCH 6/7] target-i386: Use gen_nop_modrm for prefetch instructions Richard Henderson
2016-03-03  5:30 ` [Qemu-devel] [PATCH 7/7] target-i386: Fix inhibit irq mask handling Richard Henderson
2016-03-03  8:46   ` Paolo Bonzini
2016-03-03  6:49 ` [Qemu-devel] [PATCH 0/7] target-i386 fixes Hervé Poussineau

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=56D80D2C.3060706@redhat.com \
    --to=pbonzini@redhat.com \
    --cc=hpoussin@reactos.org \
    --cc=qemu-devel@nongnu.org \
    --cc=rth@twiddle.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.