Re: [Qemu-devel] Mac OS X issues

[Joachim Henke]

Thanks for your hint!

Again I modified several suspicious parts of the code, but I haven't  
had any success. Today I installed GCC 3.4.5 from sources. The qemu  
binary compiled with this version does _not_ crash. Now I'm beginning  
to believe that the whole trouble is really a bug in Apple's old GCC  
3.3 (20030304) compiler. I'll compile GCC 3.3.6 from sources and test  
with it tomorrow.

Just for completeness: Running qemu compiled with Apple's GCC 3.3,  
booting into FreeDOS mode 3 very quickly, and starting the DOOM time  
demo (as Mike described) will crash after a few seconds:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000034
tb_jmp_remove (tb=0x8cad00, n=0) at /Volumes/Data/build/qemu/exec.c:420
420                 tb1 = *ptb;

This points to another piece of code than the GDB output I posted  
last time. But it is also called by tb_phys_invalidate() and is very  
similar to the other one: It changes pointers to TranslationBlock by  
cycling through jmp_first and jmp_next[] - seems that it catches an  
invalid address from somewhere and crashes ... this strange behaviour  
with GCC 3.3 makes no sense to me ):

Jo.


Mike Kronenberg wrote:
> Sorry, I'm a little in a hurry...
>
> The diff is rather big, so just
>
> export CVS_RSH="ssh"
> cvs -z3 -d:pserver:address@hidden:/sources/qemu  
> co -D "20051115" qemu
>
> this should check out the last working version. I built it with  
> GCC3 and it was running fine.
>
> Mike