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Fwd: [Qemu-devel] Weird behavior while using the instruction counter
From: |
Luis Pureza |
Subject: |
Fwd: [Qemu-devel] Weird behavior while using the instruction counter |
Date: |
Thu, 24 Jul 2008 15:49:21 +0100 |
By mistake I sent the following message to Paul Brook's private address.
Apologies for that.
Luis Pureza
---------- Forwarded message ----------
From: Luis Pureza <address@hidden>
Date: Thu, Jul 24, 2008 at 3:42 PM
Subject: Re: [Qemu-devel] Weird behavior while using the instruction counter
To: Paul Brook <address@hidden>
On Thu, Jul 24, 2008 at 3:02 PM, Paul Brook <address@hidden> wrote:
>> > No. You're assuming the IO trap occurs on the last instruction, which not
>> > true. The problem is that cpu_exec_nocache introduces a second TB with
>> > the same lookup key(pc+flags). cpu_io_recompile (and possibly other
>> > places) assume the currently executing TB is the only tb that matches. It
>> > needs to invalidate the original TB (if it exists) as well as the
>> > uncached one.
>>
>> Obviously, you're right. I was testing with blocks of a single
>> instruction. What do you think of this:
>>
>> if (tb != &tbs[0] && (tb - 1)->pc == tb->pc) {
>> tb_phys_invalidate(tb - 1, -1);
>> }
>
> No. There's no guarantee that the TBs are consecutive.
What about this then:
tb2 = env->tb_jmp_cache[tb_jmp_cache_hash_func(tb->pc)];
if (tb2) {
tb_phys_invalidate(tb2, -1);
}
added to the same place. This way, tb_find_fast() will never return
the old TB again.
Luis Pureza
- [Qemu-devel] Weird behavior while using the instruction counter, Luis Pureza, 2008/07/24
- Re: [Qemu-devel] Weird behavior while using the instruction counter, Paul Brook, 2008/07/24
- Re: [Qemu-devel] Weird behavior while using the instruction counter, Luis Pureza, 2008/07/24
- Message not available
- Message not available
- Re: [Qemu-devel] Weird behavior while using the instruction counter, Luis Pureza, 2008/07/24
- Re: [Qemu-devel] Weird behavior while using the instruction counter, Paul Brook, 2008/07/24
- Re: [Qemu-devel] Weird behavior while using the instruction counter, Luis Pureza, 2008/07/24
- Re: [Qemu-devel] Weird behavior while using the instruction counter, Paul Brook, 2008/07/24