RFC: Add 32bit x86-64 support to binutils

[H.J. Lu]

On Fri, Jan 14, 2011 at 3:46 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Fri, Dec 31, 2010 at 6:50 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
>> On Thu, Dec 30, 2010 at 4:48 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
>>> On Thu, Dec 30, 2010 at 4:42 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>>>> On 12/30/2010 01:08 PM, Robert Millan wrote:
>>>>> Hi folks,
>>>>>
>>>>> I had this unsubmitted patch in my local filesystem.  It makes Linux
>>>>> detect ELF32 AMD64 binaries and sets a flag to restrict them to
>>>>> 32-bit address space.
>>>>>
>>>>> It's not rocket science but can save you some work in case you
>>>>> haven't implemented this already.
>>>>>
>>>>
>>>> I have pushed my old kernel patches to a git tree at:
>>>>
>>>> git://git.kernel.org//pub/scm/linux/kernel/git/hpa/linux-2.6-ilp32.git
>>>>
>>>> They are currently based on 2.6.31 since that was the released version
>>>> when I first did this work; they are not intended to be mergeble but
>>>> rather as a prototype.
>>>>
>>>> Note that we have no intention of supporting this ABI for the kernel
>>>> itself.  The kernel will be a normal x86-64 kernel.
>>>>
>>>
>>> Here is the updated ILP32 patch for 2.6.35.
>>>
>>>
>>
>> I put my ILP32 gdb on hjl/ilp32 branch at
>>
>> http://git.kernel.org/?p=devel/gdb/hjl/x86.git;a=summary
>>
>> and my gcc 4.4 ILP32 on hjl/ilp32/gcc-4_4-branch branch at
>>
>> http://git.kernel.org/?p=devel/gcc/hjl/x86.git;a=summary
>>
>
> I checked a bunch ILP32 bug fixes into binutils, gdb and gcc.
> I also renamed the option from n32 to x32.
>
> Binutils and gdb should work correctly now. I tested them on
> a simple C library with static and dynamic binaries.  Gcc only
> works with -O0.

I put a small C library for x32 at

http://git.kernel.org/?p=devel/binutils/hjl/x32.git;a=summary


-- 
H.J.