Re: [Qemu-devel] tcg_abort()

[Laurent Desnogues <laurent.desnogues@gmail.com>]

On Wed, Sep 16, 2009 at 6:16 PM, Laurent Desnogues
<laurent.desnogues@gmail.com> wrote:
> On Wed, Sep 16, 2009 at 5:46 PM, Gary Thomas <gary@mlbassoc.com> wrote:
> [...]
>>
>> /qemu-git-2009_09_16/tcg/arm/tcg-target.c:773: tcg fatal error
>>
>>>   - how to reproduce the issue
>>
>> This one's harder - I'm running an x86 gnome application on an ARM
>> system.  I'm not sure exactly what it was doing when the abort happened.
>>
>> Questions:
>>  * The function in tcp-target.c seems complete, but it has
>>      #if 1
>>        tcg_abort();
>>      #endif
>>    which implies it's not complete or maybe just untested?
>>  * How can I gather more information about what was going on
>>    at the time to aid in fixing this?
>
> Your problem is probably due to generated code being too far from
> the helper functions (the helper functions can be thought of as a
> library).
>
> Could please try to replace the tcg_abort() on line 773 with these
> two lines?
>
>        tcg_out_movi32(s, cond, TCG_REG_R8, val);
>        tcg_out32(s, (cond << 28) | 0x012fff30 | TCG_REG_R8); /* blx r8 */
>
> I didn't test it, so you'll be my guinea pig :-)

Turned out this was wrong, it should have been:

        tcg_out_movi32(s, cond, TCG_REG_R8, addr);
        tcg_out32(s, (cond << 28) | 0x012fff30 | TCG_REG_R8); /* blx r8 */


Laurent