[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [Bug] qemu-system-ppc: "invalid/unsupported opcode" dur
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] [Bug] qemu-system-ppc: "invalid/unsupported opcode" during debug session |
Date: |
Sun, 28 Feb 2010 15:25:42 +0000 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Aurelien Jarno wrote:
> It is not a full fix, as the OS can actually use any instruction that
> always generate a trap (even a memory access) as an instruction barrier
> to make sure the following instructions are never executed. This
> actually affects all targets, but is unlikely to happen.
I'm sure I've seen code wich intentionally accesses invalid memory,
followed by non-instruction data such as a message to print. But I
can't think where.
> One solution for that would be to only generate an exception for an
> unsupported instruction when it is the first instruction of a TB, and
> otherwise just end the translation before this instruction.
Because that's a simple general solution for all targets, it sounds
like a good idea to me.
-- Jamie