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Re: RFC: Add 32bit x86-64 support to binutils
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Jan Beulich <JBeulich at novell dot com>
- Cc: "Joseph S. Myers" <joseph at codesourcery dot com>, gcc at gcc dot gnu dot org, binutils at sourceware dot org, "H. Peter Anvin" <hpa at zytor dot com>
- Date: Tue, 4 Jan 2011 09:56:47 -0800
- Subject: Re: RFC: Add 32bit x86-64 support to binutils
- References: <20101230182308.GA21296@intel.com> <Pine.LNX.4.64.1012301831270.30514@digraph.polyomino.org.uk> <AANLkTi=5rp8+1_h=Bt-FLnVW0mDY6N_tLb020XHr4d1n@mail.gmail.com> <Pine.LNX.4.64.1012301905400.30514@digraph.polyomino.org.uk> <AANLkTik6qXqKC8tEizXo1GrvEa7x9UGYaApN1n78Fa-b@mail.gmail.com> <AANLkTimUbL99QQaoAgaBHGctgtTurybP1DEjN8YbNXRt@mail.gmail.com> <4D21B5C1020000780002A0BC@vpn.id2.novell.com>
On Mon, Jan 3, 2011 at 2:40 AM, Jan Beulich <JBeulich@novell.com> wrote:
>>>> On 30.12.10 at 21:02, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>>
>> Here is the ILP32 psABI:
>>
>> http://www.kernel.org/pub/linux/devel/binutils/ilp32/
>>
>
> I think it is a gross misconception to tie the ABI to the ELF class of
> an object. Specifying the ABI should imo be done via e_flags or
> one of the unused bytes of e_ident, and in all reality the ELF class
> should *only* affect the file layout (and 64-bit should never have
> forbidden to use 32-bit ELF containers; similarly 64-bit ELF objects
> may have uses for 32-bit architectures/ABIs, e.g. when debug
> information exceeds the 4G boundary).
>
I agree with you in principle. But I think it should be done via
a new attribute section, similar to ARM.
--
H.J.