Re: [Qemu-devel] [PATCH] tcg, tci: Add TCG and interpreter for bytecode (virtual machine)

[Stefan Weil <weil@mail.berlios.de>]

Blue Swirl schrieb:
> On Mon, Sep 28, 2009 at 7:50 PM, Stefan Weil <weil@mail.berlios.de> wrote:
>   
>> This is an initial and highly experimental version of
>> a new code generator which does not create native code
>> (so it will not depend on the host running qemu when it
>> is finished). It creates bytecode which is interpreted.
>>
>> The current version can run the bios code, a simple
>> hello world and the linux-user testcode for the
>> i386 and x86_64 targets on x86_64 hosts.
>>
>> Some additional information is in tcg/bytecode/README
>> which is part of the patch.
>>
>> Please send patches / enhancements based on my latest
>> version from git://repo.or.cz/qemu/ar7.git.
>>     
>
> Nice. When the interpreter works, it should be unconditional for
> targets that are not supported by TCG.
>
>   
>> +QEMU can create native code for some hosts (arm, hppa, i386, ppc, ppc64,
>> +sparc, x86_64). For others, inoffical host support was written (s390).
>>     
>
> unofficial
>
>   
>> +static const int tcg_target_call_oarg_regs[2] = {
>> +    // TODO: ppc64 only uses one register. Why do others use two?
>>     
>
> To pass a 64 bit return value in two 32 bit registers?
>
>   
>> +static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
>>     
>
>   
>> +#if TCG_TARGET_NB_REGS == 16 || TCG_TARGET_NB_REGS == 32
>>     
>
>   
>> +    "r16",
>>     
>
> Table overflow.
>
>   

Thanks. Fixed in git://repo.or.cz/qemu/ar7.git