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Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakp
From: |
Sergey Fedorov |
Subject: |
Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint |
Date: |
Fri, 16 Oct 2015 17:08:11 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 16.10.2015 04:14, Richard Henderson wrote:
> On 10/16/2015 03:36 AM, Peter Maydell wrote:
>> On 14 October 2015 at 22:02, Richard Henderson <address@hidden> wrote:
>>> On 10/15/2015 06:34 AM, Peter Maydell wrote:
>>>>
>>>> This is still the same cryptic comment we have in the
>>>> targets which do do this. Can we have something
>>>> that is a bit more explanatory about what is going on and
>>>> why we need to do this, please?
>>>
>>>
>>> Suggestions?
>>
>> ...well, I don't entirely understand the problem it's
>> fixing, which is why I'm asking for a better comment :-)
>
> Heh. Fair enough. How about
>
> /* The address covered by the breakpoint must be included in
> [tb->pc, tb->pc + tb->size) in order to for it to be
> properly cleared -- thus we increment the PC here so that
> the logic setting tb->size below does the right thing. */
>
> There are two edge cases that cause the problem with clearing that
> could be described, but I think that the comment becomes too bulky, as
> well as confuses the situation for someone cutting-and-pasting the
> logic to a new port.
Maybe we could rather fix that condition in
tb_invalidate_phys_page_range()? It seems weird that it can't handle a
zero-sized TB.
Best,
Sergey
- [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Richard Henderson, 2015/10/15
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Sergey Fedorov, 2015/10/14
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Peter Maydell, 2015/10/14
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Richard Henderson, 2015/10/15
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Peter Maydell, 2015/10/15
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Richard Henderson, 2015/10/15
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Peter Maydell, 2015/10/16
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint,
Sergey Fedorov <=
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Sergey Fedorov, 2015/10/16
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Sergey Fedorov, 2015/10/16
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Richard Henderson, 2015/10/18
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Sergey Fedorov, 2015/10/19
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Richard Henderson, 2015/10/19
- Re: [Qemu-devel] [PATCH] target-*: Advance pc after recognizing a breakpoint, Sergey Fedorov, 2015/10/19