Re: [Qemu-devel] Please help fix an illegal instruction / SSE problem

[Pierre d'Herbemont]

On 16 févr. 07, at 04:51, Ilya Shar wrote:

> Every Cocoa application I try to run under
> i386-darwin-user/qemu-i386 exits on an illegal
> instruction:
>
> Starting
> /Applications/Calculator.app/Contents/MacOS/Calculator
> with qemu
> ----------------
> queue_signal: sig=4
> qemu: uncaught target signal 4 (Illegal instruction) -
> exiting
>
> The last block always executes SSE instructions:
> ----------------
> IN:
> 0xffff0ab7:  movdqa 0xfffffffa(%esi,%edx,1),%xmm0
> 0xffff0abd:  movdqa 0xa(%esi,%edx,1),%xmm1
> 0xffff0ac3:  movdqa 0x1a(%esi,%edx,1),%xmm2
> 0xffff0ac9:  movdqa 0x2a(%esi,%edx,1),%xmm3
> 0xffff0acf:  movdqa 0x3a(%esi,%edx,1),%xmm4
> 0xffff0ad5:  movdqa %xmm0,%xmm5
> 0xffff0ad9:  movdqa %xmm4,%xmm0
> 0xffff0add:  data16
> 0xffff0ade:  (bad)
>
> Non-graphics applications run fine.
>
> Could it be a configuration/compilation problem
> (although some SEE instructions seem to be handled
> fine)?  If not, is there a way to better diagnose the
> problem?  I on Mac OS Intel with QEMU 0.9.0.

Calculator is crashing in the commpage (see darwin-user/commpage.c).  
Commpage is for now shared with the host for x86-on-x86 (and for ppc- 
on-ppc too). As the commpage is optimized by the kernel for your host  
specific proc, there tends to be problem with qemu. You could try to  
play a bit with qemu cpuid (darwin-user/main.c:788), or implement the  
needed instructions in qemu. An other way would be to use what's in  
commpage.c (see commpage_init()), by translating the target address  
space.

Pierre.