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This is the place to discuss modification and extension of x86-64 processor specific System V Application Binary Interface. The current x86-64 psABI source is at

https://gitlab.com/x86-psABIs/x86-64-ABI

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Arthur Eubanks, … H.J. Lu21

Jun 9

[RFC] Redefining the Large Code Model

Another idea to prevent binary size increase in small binaries is to go back to thunks for all out of

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[RFC] Redefining the Large Code Model

Another idea to prevent binary size increase in small binaries is to go back to thunks for all out of

Jun 9

A Sandberg Eriksson

Jun 6

clarify passing and returning NO_CLASS values in function calling

Hi all, it is not explicitly spelled out how this happens. I think they are skipped in argument

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clarify passing and returning NO_CLASS values in function calling

Hi all, it is not explicitly spelled out how this happens. I think they are skipped in argument

Jun 6

May 31

PC-relative reloc that resolves to the next instruction when undefined

## Request A new relocation, provisionally `R_X86_64_PCNEXT32` (`word32`), self-contained: | symbol |

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PC-relative reloc that resolves to the next instruction when undefined

## Request A new relocation, provisionally `R_X86_64_PCNEXT32` (`word32`), self-contained: | symbol |

May 31

Farid Zakaria, … Michael Matz12

Apr 28

Large Code Model Relaxations

I have published the large code-model ABI PR for support of new relocation types for relaxation

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Large Code Model Relaxations

I have published the large code-model ABI PR for support of new relocation types for relaxation

Apr 28

Farid Zakaria, … Farid Zakaria23

Mar 20

[RFC] Add thunk support for x86

This is a little late but I finally cleaned up our internal document for sharing: https://docs.google

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[RFC] Add thunk support for x86

This is a little late but I finally cleaned up our internal document for sharing: https://docs.google

Mar 20

connor horman, … Florian Weimer10

Feb 9

Fwd: OSABI Assignment

Having a Private Use Area would be suitable in this case, at least for now. Using 240 to 255 would be

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Fwd: OSABI Assignment

Having a Private Use Area would be suitable in this case, at least for now. Using 240 to 255 would be

Feb 9

Farid Zakaria, … Arthur Eubanks8

Jan 21

Making medium code-model handle large binaries

I'll try to pull some. As with anything, I suggested a flag to control it -- so I think that

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Making medium code-model handle large binaries

I'll try to pull some. As with anything, I suggested a flag to control it -- so I think that

Jan 21

9/15/25

License for x86-64 psABI/Intel 386 psABI

Hello, I was wondering what license is applied to the x86-64 psABI and Intel 386 psABI's hosted

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License for x86-64 psABI/Intel 386 psABI

Hello, I was wondering what license is applied to the x86-64 psABI and Intel 386 psABI's hosted

9/15/25

Florian Weimer, H.J. Lu8

7/15/25

Switching x86-64 to GNU2 TLS descriptors

* HJ Lu: > On Tue, Jul 15, 2025 at 8:47 AM 'Florian Weimer' via X86-64 System V >

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Switching x86-64 to GNU2 TLS descriptors

* HJ Lu: > On Tue, Jul 15, 2025 at 8:47 AM 'Florian Weimer' via X86-64 System V >

7/15/25

7/10/25

[PATCH i386] Add optional __int128 support

On Wed Jul 9, 2025 at 6:10 AM EDT, Trevor Gross wrote: > Define the __int128 type as an integer

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[PATCH i386] Add optional __int128 support

On Wed Jul 9, 2025 at 6:10 AM EDT, Trevor Gross wrote: > Define the __int128 type as an integer

7/10/25

Jan Beulich, … Florian Weimer9

2/22/25

value extension (or not) during parameter passing

I submitted an MR to make this explicit: Clarify the unspecified nature of excess bits in INTEGER

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value extension (or not) during parameter passing

I submitted an MR to make this explicit: Clarify the unspecified nature of excess bits in INTEGER

2/22/25

H.J. Lu, Michael Matz2

2/17/25

[RFC] Clarify x86-64 GOT slot access

Hello, On Sat, 15 Feb 2025, HJ Lu wrote: > x86-64 GOT is > > extern Elf64_Addr

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[RFC] Clarify x86-64 GOT slot access

Hello, On Sat, 15 Feb 2025, HJ Lu wrote: > x86-64 GOT is > > extern Elf64_Addr

2/17/25

Victor Khimenko, Michael Matz2

12/11/24

On Fri, 6 Dec 2024, 'Victor Khimenko' via X86-64 System V Application Binary Interface wrote:

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On Fri, 6 Dec 2024, 'Victor Khimenko' via X86-64 System V Application Binary Interface wrote:

12/11/24

11/4/24

x86-64 vs GNU_PROPERTY_X86_ISA_1_BASELINE

Hello, the features covered by GNU_PROPERTY_X86_ISA_1_BASELINE are prereq-s for x86-64, aiui. Is

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x86-64 vs GNU_PROPERTY_X86_ISA_1_BASELINE

Hello, the features covered by GNU_PROPERTY_X86_ISA_1_BASELINE are prereq-s for x86-64, aiui. Is

11/4/24

Florian Weimer, … Stephen Röttger8

10/2/24

Alternative CET ABI

> If this would look like the plt, it should work without run-time code generation. > So for

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Alternative CET ABI

> If this would look like the plt, it should work without run-time code generation. > So for

10/2/24

Jan Beulich, … Roland McGrath7

3/24/24

Dwarf2 register number for SSP

I would strongly encourage assigning DWARF numbers for all registers. It doesn't matter if

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Dwarf2 register number for SSP

I would strongly encourage assigning DWARF numbers for all registers. It doesn't matter if

3/24/24

coshvji cujmlqef

2/22/24

Hi. Can we documentary ms abi too?

i think sysv-abi documentary should also document microsoft abi on x86_64 because both gcc and clang

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Hi. Can we documentary ms abi too?

i think sysv-abi documentary should also document microsoft abi on x86_64 because both gcc and clang

2/22/24

H.J. Lu, … Florian Weimer11

2/22/24

[PATCH] Assign DWARF register number mapping for AMX registers

On Wed, Feb 21, 2024 at 9:27 AM HJ Lu <hjl....@gmail.com> wrote: > > On Thu, Feb 15,

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[PATCH] Assign DWARF register number mapping for AMX registers

On Wed, Feb 21, 2024 at 9:27 AM HJ Lu <hjl....@gmail.com> wrote: > > On Thu, Feb 15,

2/22/24

H.J. Lu, … Jan Beulich6

2/12/24

[RFC] Should unused bits in _BitInt be zeroed?

On 12.02.2024 15:35, Michael Matz wrote: > On Thu, 8 Feb 2024, HJ Lu wrote: > >> Should

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[RFC] Should unused bits in _BitInt be zeroed?

On 12.02.2024 15:35, Michael Matz wrote: > On Thu, 8 Feb 2024, HJ Lu wrote: > >> Should

2/12/24

Florian Weimer, H.J. Lu3

2/11/24

GCC and the GNU2 TLS descriptor call ABI

On Sun, Feb 11, 2024 at 6:24 AM HJ Lu <hjl....@gmail.com> wrote: > > On Sun, Feb 11,

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GCC and the GNU2 TLS descriptor call ABI

On Sun, Feb 11, 2024 at 6:24 AM HJ Lu <hjl....@gmail.com> wrote: > > On Sun, Feb 11,

2/11/24

H.J. Lu, Michael Matz2

2/6/24

[PATCH] APX: Add R_X86_64_CODE_(5|6)_(GOTPCRELX|GOTTPOFF|GOTPC32_TLSDESC)

Hello, On Tue, 6 Feb 2024, HJ Lu wrote: > Add 6 new relocations: > > #define

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[PATCH] APX: Add R_X86_64_CODE_(5|6)_(GOTPCRELX|GOTTPOFF|GOTPC32_TLSDESC)

Hello, On Tue, 6 Feb 2024, HJ Lu wrote: > Add 6 new relocations: > > #define

2/6/24

H.J. Lu, … Michael Matz8

2/6/24

[PATCH] APX: Add R_X86_64_CODE_6_GOTTPOFF

On Tue, Feb 6, 2024 at 5:31 AM Michael Matz <ma...@suse.de> wrote: > > Heyho, > > On

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[PATCH] APX: Add R_X86_64_CODE_6_GOTTPOFF

On Tue, Feb 6, 2024 at 5:31 AM Michael Matz <ma...@suse.de> wrote: > > Heyho, > > On

2/6/24

connor horman, James Y Knight2

1/27/24

Specify the ABI of C/++11 atomics

The ABI should also specify the size/alignment of C11 atomic types. Eg: typedef _Atomic struct {char

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Specify the ABI of C/++11 atomics

The ABI should also specify the size/alignment of C11 atomic types. Eg: typedef _Atomic struct {char

1/27/24

H.J. Lu, Jan Beulich17

1/22/24

Document GNU_PROPERTY_X86_XXX

On 26.09.2023 17:34, HJ Lu wrote: > On Tue, Sep 26, 2023 at 12:50 AM Jan Beulich <jbeulich@suse

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Document GNU_PROPERTY_X86_XXX

On 26.09.2023 17:34, HJ Lu wrote: > On Tue, Sep 26, 2023 at 12:50 AM Jan Beulich <jbeulich@suse

1/22/24

H.J. Lu, … Michael Matz3

1/9/24

Make __int128 mandatory

Hello, On Thu, 4 Jan 2024, 'Jan Beulich' via X86-64 System V Application Binary Interface

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Make __int128 mandatory

Hello, On Thu, 4 Jan 2024, 'Jan Beulich' via X86-64 System V Application Binary Interface

1/9/24

Sunil Pandey, … Jan Beulich7

1/7/24

__BitInt(N) size and alignment change request for N > 64

On Thursday, January 4, 2024 at 12:48:14 AM UTC-8 jbeu...@suse.com wrote: On 31.12.2023 01:51, Sunil

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__BitInt(N) size and alignment change request for N > 64

On Thursday, January 4, 2024 at 12:48:14 AM UTC-8 jbeu...@suse.com wrote: On 31.12.2023 01:51, Sunil

1/7/24

Noah Goldstein, H.J. Lu2

1/5/24

[RFC][PATCH] Add power of 2 requirement to DT_X86_64_PLTENT

On Thu, Jan 4, 2024 at 7:50 PM Noah Goldstein <goldst...@gmail.com> wrote: > > ---

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[RFC][PATCH] Add power of 2 requirement to DT_X86_64_PLTENT

On Thu, Jan 4, 2024 at 7:50 PM Noah Goldstein <goldst...@gmail.com> wrote: > > ---

1/5/24

mas...@google.com, … Michael Matz18

10/16/23

Large data sections for the large code model

On Mon, Oct 16, 2023 at 6:38 AM Uros Bizjak <ubi...@gmail.com> wrote: > > On Mon, Oct 16

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Large data sections for the large code model

On Mon, Oct 16, 2023 at 6:38 AM Uros Bizjak <ubi...@gmail.com> wrote: > > On Mon, Oct 16

10/16/23

H.J. Lu, … Michael Matz13

9/20/23

[RFC][PATCH] Add DT_X86_64_PLT/DT_X86_64_PLTSZ/DT_X86_64_PLTENT

On Fri, Sep 15, 2023 at 6:29 AM Michael Matz <ma...@suse.de> wrote: > > Hello, > >

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[RFC][PATCH] Add DT_X86_64_PLT/DT_X86_64_PLTSZ/DT_X86_64_PLTENT

On Fri, Sep 15, 2023 at 6:29 AM Michael Matz <ma...@suse.de> wrote: > > Hello, > >

9/20/23

H.J. Lu, Michael Matz3

9/12/23

[RFC][PATCH] APX: Add R_X86_64_CODE_4_GOTPC32_TLSDESC

On Mon, Sep 11, 2023 at 5:45 AM Michael Matz <ma...@suse.de> wrote: > > Hey, > > On

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[RFC][PATCH] APX: Add R_X86_64_CODE_4_GOTPC32_TLSDESC

On Mon, Sep 11, 2023 at 5:45 AM Michael Matz <ma...@suse.de> wrote: > > Hey, > > On

9/12/23

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