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Re: RFC: A new MIPS64 ABI
- From: Ralf Baechle <ralf at linux-mips dot org>
- To: David Daney <ddaney at caviumnetworks dot com>, linux-mips <linux-mips at linux-mips dot org>, GCC <gcc at gcc dot gnu dot org>, binutils <binutils at sourceware dot org>, Prasun Kapoor <prasun dot kapoor at caviumnetworks dot com>, rdsandiford at googlemail dot com
- Date: Mon, 9 May 2011 15:28:28 +0100
- Subject: Re: RFC: A new MIPS64 ABI
- References: <4D5990A4.2050308__41923.1521235362$1297715435$gmane$org@caviumnetworks.com> <87hbbxqihm.fsf@firetop.home>
On Mon, Feb 21, 2011 at 07:45:41PM +0000, Richard Sandiford wrote:
> David Daney <ddaney@caviumnetworks.com> writes:
> > Background:
> >
> > Current MIPS 32-bit ABIs (both o32 and n32) are restricted to 2GB of
> > user virtual memory space. This is due the way MIPS32 memory space is
> > segmented. Only the range from 0..2^31-1 is available. Pointer
> > values are always sign extended.
> >
> > Because there are not already enough MIPS ABIs, I present the ...
> >
> > Proposal: A new ABI to support 4GB of address space with 32-bit
> > pointers.
>
> FWIW, I'd be happy to see this go into GCC.
So am I for the kernel primarily because it's not really a new ABI but
an enhancement of the existing N32 ABI.
Ralf