Re: [Qemu-devel] X86_64 (AMD64) build segfaults

["developer@isl-gbr.de" <developer@isl-gbr.de>]

I don't think it'll be possible for me to fix this, i don't have any knowledge about these functions at all...


On Fri, 22 Apr 2005 18:12:10 +0200
Jonas Maebe <jonas.maebe@elis.ugent.be> wrote:

> 
> On 22 apr 2005, at 17:41, developer@isl-gbr.de wrote:
> 
> > Hello Jonas, here is the output of the command you gave me for this 
> > function, does this help ?
> 
> It helps in the sense that it confirms my suspicion, although I don't 
> know why it creates such convoluted code. Maybe in order to have as 
> small code as possible with at the same time as many aligned jump 
> targets as possible. It's definitely not trivial to parse this, and 
> even less trivial to rewrite it so it is usable for qemu's purposes (in 
> this particular case, the retq could be replaced by a jmp, but you 
> can't count on there being 4 padding bytes after each ret).
> 
> You (or someone else) will have to find a way to force gcc 4.0 to put 
> one ret (or jump) at the very end of the code it generates. If that's 
> not possible, it will be quite hard to support gcc 4.0 in qemu...
> 
> 
> Jonas
> 
> 
> 
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