Re: memory operation operand len

i want to lock the page the atomic memory operation is going to work
on . this way atomic operations can be emulated correctly when the
CPUs are running in parallel.

I happen to add function calls to acquire exclusive ownership of a
page just before the atomic instruction is about to execute.

In case of page fault, i think BOCHS returns to the CPU loop using
longjmp. i  have code to release the exclusive ownership of the page
there as well.

Xin


On Fri, Oct 19, 2012 at 3:27 PM, Stanislav <[email protected]> wrote:
> By reading the class bxInstruction_c you cannot know a thing, especially
> because some instructions access memory multiple times (FXSAVE, REP MOVS) or
> access variable amount of bytes (VMASKMOV).
>
> I am not talking about many memory access cases which not related to any
> instruction (page walks, descriptors reads and other system stuff).
>
> Also before the memory access actually happen an instruction might fault so
> the memory access won't happen.
>
> But what do you want to do ?
>
> Might be I can help ...
>
> If you searching to lock memory before memory access happens you can look
> for BX_NOTIFY_LIN_MEMORY_ACCESS and BX_NOTIFY_PHY_MEMORY_ACCESS all around
> the code.
>
> Stanislav
>
> -----Original Message-----
> From: Xin Tong [mailto:[email protected]]
> Sent: Friday, October 19, 2012 9:06 PM
> To: [email protected]
> Subject: [Bochs-developers] memory operation operand len
>
> what is the best way to figure out the length of the memory a memory
> operation is going to access in BOCHS ? I read the class bxInstruction_c. it
> does not seem to provide anything to do that ?
>
> Xin
>
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