Re: [Qemu-devel] sh4 linux user emulation on an x86_64 system

[michael <trimarchi@gandalf.sssup.it>]

Vince Weaver wrote:
> Hello
>
>> On Wed, 15 Oct 2008, michael wrote:
>> qemu-sh4-32 I don't have problems. I have the log and the program run 
>> ok.
>>
>> If I recompile for the qemu-sh4-64 the system crash. I find the 
>> reason of the
>
> I have nothing useful to add, except that I have been trying to track 
> down a very similar problem with qemu-cris.  It works fine on x86, but 
> gets stuck in x86-64 due to the PC getting mis-set.  The problem seems 
> possibly related to the exception handling code which uses longjmp.  
> Maybe the problems are related.
>
> Vince
>
In the user-mode I see that the expection handling just set the 
expeciont reason to -1. I will try to
track down the problem. I don't find how the tcg avoid the use of low 
part of a register that is used
used for special purpose. The x86_64 has the notion only of the 64bit 
register but a 64bit register
can be used only in the low part. Another thing is the define:

#define CODE_GEN_ALIGN           16 /* must be >= of the size of a 
icache line */

In the x86_64 is not 64?

Regards Michael



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