Re: [Qemu-devel] Question about gen_jmp_tb

[Jack Biggs <john.biggs@epfl.ch>]

Hi Richard, thanks for your help.

Which instruction, then, I should add my gen_helper to in order for it 
to be called at the end of each basic block, as I've previously stated? 
Is there a way I can generically have this change apply to every target?

Jack

On 05/30/2014 06:25 PM, Richard Henderson wrote:
> On 05/30/2014 01:56 AM, Jack Biggs wrote:
>> Hi all,
>>
>> I'm trying to add some arbitrary code to the end of each translation block, and
>> I wanted to confirm my suspicion that each translation block ends in a jmp
>> instruction, and that each translation block ends (or jumps to another TB) with
>> the call to gen_jmp_tb. My guest is i386, but if this is architecture-specific
>> I'd like to know more about per-target semantics.
> No, not every tb ends with gen_jmp_tb.  Indeed, only those for which we have an
> immediate address end that way.  Plenty of tb's end with indirect branches, or
> for a variety of other reasons.
>
> Certainly gen_jmp_tb is specific to the i386 translator.
>
>
> r~