Re: [uml-devel] Re: [patch 4/4] uml: make it link in tt mode against NPTL glibc

[Blaisorblade]

On Friday 27 May 2005 06:20, Al Viro wrote:
> On Fri, May 27, 2005 at 02:40:24AM +0200, blaisorblade@xxxxxxxx wrote:
> > To make sure switcheroo() can execute when we remap all the executable
> > image, we used a trick to make it use a local copy of errno... this trick
> > does not work with NPTL glibc, only with LinuxThreads, so use another
> > (simpler) one to make it work anyway.
> >
> > Might need compile testing on different host archs, since it changes
> > __syscall_return from <asm/unistd.h>.
>
> For one thing, it's broken since mmap2() doesn't exist on amd64.  This
> stuff *is* low-level - as low-level as it gets.
> It's clearly 
> per-architecture.
Yes, agreed.
> See ftp.linux.org.uk/pub/people/viro/UM14-unmap-RC12-rc4 
> for a fix...
Seems reasonable except that on i386 you keep the old linker script, indeed; I 
think that the linker script shouldn't be per architecture.

Also (not verified) one section is either read-write or read-only, so 
merging .bss and .text does not seem good to me (I separated them on 
purpose).

Good catch for using .bss instead of .data.
-- 
Paolo Giarrusso, aka Blaisorblade
Skype user "PaoloGiarrusso"
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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