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Re: [Qemu-devel] [PATCH] PPC: Fix linker scripts on ppc hosts

From: Paul Brook
Subject: Re: [Qemu-devel] [PATCH] PPC: Fix linker scripts on ppc hosts
Date: Wed, 14 Dec 2011 00:30:44 +0000
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> >>>>> When compiling qemu statically with multilib on PPC, we hit the
> >>>>> same issue that commit 845f2c2812d9ed24b36c02a3d06ee83aeafe8b49
> >>>>> is fixing. Do the same here.
> >>>> 
> >>>> How many of these ld files can we get rid of if we use -Ttext-segment
> >>>> instead? Generally all we're really caring about is moving the program
> >>>> base around so that it doesn't conflict with the address space we want
> >>>> to use for the client.
> >>> 
> >>> Now that we have the automatic GUEST_BASE stuff you shouldn't need to
> >>> do either.
> >> 
> >> If it was working, yes :)
> > 
> > What doesn't work?  I put a fair amout of effort into making it
> > automatically pick a sensible value.  If there's some reason that won't
> > work then you probably want to be using -R.
> IIRC mmap'ing files would break with 32-on-64, but I'd have to check up on
> the details. I ended up passing MAP_32BIT to all linux-user mmap calla for
> 32-on-x86_64, but that doesn't work with -R.

Hmm, I thought we'd fixed that.  It's the reason h2g_valid exists.

Either way it should definitely work with -R.  I specifically added that to 
avoid problems with the host mmap picking inconvenient addresse.

MAP_32BIT is an unconsionable hack, and doesn't exist on other 64-bit hosts.


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