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Re: [Qemu-devel] [PATCH 4/7] target-i386: Dump illegal opcodes with -d u
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 4/7] target-i386: Dump illegal opcodes with -d unimp |
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Date: |
Thu, 3 Mar 2016 11:08:44 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
> 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
- [Qemu-devel] [PATCH 0/7] target-i386 fixes, Richard Henderson, 2016/03/03
- [Qemu-devel] [PATCH 1/7] target-i386: avoid repeated calls to the bnd_jmp helper, Richard Henderson, 2016/03/03
- [Qemu-devel] [PATCH 2/7] target-i386: fix smsw and lmsw from/to register, Richard Henderson, 2016/03/03
- [Qemu-devel] [PATCH 5/7] target-i386: fix addr16 prefix, Richard Henderson, 2016/03/03
- [Qemu-devel] [PATCH 6/7] target-i386: Use gen_nop_modrm for prefetch instructions, Richard Henderson, 2016/03/03
- [Qemu-devel] [PATCH 3/7] target-i386: Fix SMSW for 64-bit mode, Richard Henderson, 2016/03/03
- [Qemu-devel] [PATCH 4/7] target-i386: Dump illegal opcodes with -d unimp, Richard Henderson, 2016/03/03
[Qemu-devel] [PATCH 7/7] target-i386: Fix inhibit irq mask handling, Richard Henderson, 2016/03/03
Re: [Qemu-devel] [PATCH 0/7] target-i386 fixes, Hervé Poussineau, 2016/03/03