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Date: Wed, 25 Jul 2007 17:47:21 -0700
From: Peter Grehan <grehan@freebsd.org>
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Cc: current@FreeBSD.org, peter@FreeBSD.org, cognet@freebsd.org
Subject: Re: installworld breaks my FreeBSD/powerpc system!!!
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>> > I think it's a mmap(2) problem, rather than a libc/ld-elf problem. I 
>> > suspect
>> > that the peter@'s change to not align arguments is causing the problem. 

  Yes and no :)

  ppc is 32-bit/big-endian which doesn't sit too nice for 64-bit syscall 
returns and FreeBSD's td_retval[0|1] scheme. There is some special-case 
code in powerpc/trap.c that obscurely catches these cases and swaps the 
retvals to match the ppc calling convention.

  With mmap (and others) moving from the indirect _syscall() to a direct 
call, that code fragment needs to be updated and the backward-compat 
cases handled. I'll see if I can knock up something and test it.

  arm/be will have the same issue, Olivier cc'd.

later,

Peter.