RFC: Intel386 psABI version 1.1 draft

[H.J. Lu]

Hi,

Here is the Intel386 psABI version 1.1 draft:

https://github.com/hjl-tools/x86-psABI/wiki/intel386-psABI-20151120.pdf

Main changes are

1. Add AVX-512 support.
2. Add linker optimization to combine GOTPLT and GOT slots.
3. Add R_386_GOT32X relocation and linker optimization.
4. Add FS/GS Base addresses to DWARF register number mapping.
5. Add Intel MPX support.

MPX supported has been checked into GCC 5. Linker optimization has
been added to ld in binutils 2.25 and gold in binutils 2.26. Gold and ld in
binutils 2.26 supports new relocations. Ld in binutils 2.26 can optimize
new relocations.

Any comments and feedbacks?

Thanks.

--
H.J.

[Thiago Macieira]

Hi H.J.

The doc does not specify whether the AVX-512 mask registers are callee- or
caller-saved. I imagine, like all new registers, they are all caller-saved,
but it would be nice to be explicit and add them to the table of registers.
The MPX registers should also be listed and remark that they are special, to
see the chapter on them.

Besides that, I have a couple of editorial comments, like missing closing
parentheses. How would you prefer to receive them? A patch to the .tex files?

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
Software Architect - Intel Open Source Technology Center
PGP/GPG: 0x6EF45358; fingerprint:
E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358

[H.J. Lu]

On Tue, Nov 24, 2015 at 9:09 AM, Thiago Macieira <thi...@macieira.org> wrote:
> On Tuesday 24 November 2015 08:16:40 H.J. Lu wrote:
>> Hi,
>>
>> Here is the Intel386 psABI version 1.1 draft:
>>
>> https://github.com/hjl-tools/x86-psABI/wiki/intel386-psABI-20151120.pdf
>>
>> Main changes are
>>
>> 1. Add AVX-512 support.
>> 2. Add linker optimization to combine GOTPLT and GOT slots.
>> 3. Add R_386_GOT32X relocation and linker optimization.
>> 4. Add FS/GS Base addresses to DWARF register number mapping.
>> 5. Add Intel MPX support.
>>
>> MPX supported has been checked into GCC 5. Linker optimization has
>> been added to ld in binutils 2.25 and gold in binutils 2.26. Gold and ld in
>> binutils 2.26 supports new relocations. Ld in binutils 2.26 can optimize
>> new relocations.
>>
>> Any comments and feedbacks?
>
> Hi H.J.
>
> The doc does not specify whether the AVX-512 mask registers are callee- or
> caller-saved. I imagine, like all new registers, they are all caller-saved,
> but it would be nice to be explicit and add them to the table of registers.
> The MPX registers should also be listed and remark that they are special, to
> see the chapter on them.

Fixed on hjl/x86/master branch.

> Besides that, I have a couple of editorial comments, like missing closing
> parentheses. How would you prefer to receive them? A patch to the .tex files?
>

Please send me a patch against hjl/x86/master branch.

Thanks.

--
H.J.

[H.J. Lu]

Here is the Intel386 psABI version 1.1:

https://github.com/hjl-tools/x86-psABI/wiki/intel386-psABI-1.1.pdf

--
H.J.