Re: [Qemu-devel] [PATCH v4 04/12] fix qemu_alloc/qemu_free for linux-user subsystem

[Andreas Färber]

Am 20.06.2009 um 11:54 schrieb Jean-Christophe DUBOIS:

> [...] if you happen to have a clue on why the linux-user and bsd- 
> user (and not
> darwin-user) targets need to have a different implementation I would  
> be
> interested to know.

Fabrice himself decided that user emulators should not share code.  
This rule was not only applied to syscalls themselves (discussion of  
reuse between bsd and darwin) but also to general stuff like ELF  
loading and apparently malloc/free.

This has made starting a haiku-user implementation quite a pain - you  
can't just start with implementing the actual platform-specific  
syscalls but have to get there first, understanding and copying parts  
of another *-user emulator, with it being unclear which parts to copy  
and which not to...

The difference between linux-, bsd- and darwin-user is that darwin- 
user is not maintained and thus not updated with new functions such as  
qemu_alloc. I'd be surprised if you got it to compile and work for  
testing your changes. (darwin-user might come in handy again though  
when x86-only Snow Leopard arrives later this year.)

Andreas