From: David Daney <ddaney@caviumnetworks.com>
To: Matt Thomas <jabbathespud@gmail.com>
Cc: GCC <gcc@gcc.gnu.org>, binutils <binutils@sourceware.org>,
Prasun Kapoor <prasun.kapoor@caviumnetworks.com>
Subject: Re: RFC: A new MIPS64 ABI
Date: Tue, 15 Feb 2011 02:50:00 -0000 [thread overview]
Message-ID: <4D59E9E1.5080405@caviumnetworks.com> (raw)
In-Reply-To: <C572C2C0-B58D-4A14-8479-6374927EC557@gmail.com>
On 02/14/2011 06:33 PM, Matt Thomas wrote:
>
> On Feb 14, 2011, at 6:22 PM, David Daney wrote:
>
>> On 02/14/2011 04:15 PM, Matt Thomas wrote:
>>>
>>> I have to wonder if it's worth the effort. The primary problem I see
>>> is that this new ABI requires a 64bit kernel since faults through the
>>> upper 2G will go through the XTLB miss exception vector.
>>>
>>
>> Yes, that is correct. It is a 64-bit ABI, and like the existing n32 ABI requires a 64-bit kernel.
>
> N32 doesn't require a LP64 kernel, just a 64-bit register aware kernel.
> Your N32-big does require a LP64 kernel.
>
But using 'official' kernel sources the only way to get a 64-bit
register aware kernel is for it to also be LP64. So effectively, you do
in fact need a 64-bit kernel to run n32 userspace code.
My proposed ABI would need trivial kernel changes:
o Fix a couple of places where pointers are sign extended instead of
zero extended.
o Change the stack address and address ranges returned by mmap().
The main work would be in the compiler toolchain and runtime libraries.
David Daney
next prev parent reply other threads:[~2011-02-15 2:50 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-14 20:29 David Daney
2011-02-15 0:15 ` Matt Thomas
2011-02-15 1:57 ` Paul Koning
2011-02-15 2:15 ` Joe Buck
2011-02-15 2:16 ` Paul Koning
2011-02-15 2:26 ` David Daney
2011-02-15 2:35 ` Matt Thomas
2011-02-15 2:43 ` David Daney
2011-02-15 17:33 ` Joseph S. Myers
2011-02-15 18:15 ` David Daney
2011-02-15 2:22 ` David Daney
2011-02-15 2:33 ` Matt Thomas
2011-02-15 2:50 ` David Daney [this message]
2011-02-15 3:02 ` Matt Thomas
2011-02-15 17:41 ` David Daney
2011-02-15 17:48 ` Paul Koning
2011-02-15 17:56 ` Alexandre Oliva
2011-02-15 18:08 ` David Daney
2011-05-06 8:31 ` Alexandre Oliva
2011-05-06 17:00 ` David Daney
2011-02-18 1:02 ` David Daney
[not found] <4D5990A4.2050308__41923.1521235362$1297715435$gmane$org@caviumnetworks.com>
2011-02-21 19:45 ` Richard Sandiford
2011-05-09 14:27 ` Ralf Baechle
2011-05-09 17:47 ` David Daney
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