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[pauthabi64][aaelf64] Move PAuth GOT relocs out of private space #300

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[pauthabi64][aaelf64] Move PAuth GOT relocs out of private space #300

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671ee0b
Add Auth variants of TLSDESC generating GOT relocations
smithp35 Nov 5, 2024
6b15b45
[pauthabi64][aaelf64] Move PAuth GOT relocs out of private space
smithp35 Nov 29, 2024
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123 changes: 84 additions & 39 deletions aaelf64/aaelf64.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -281,6 +281,9 @@ changes to the content of the document for that release.
| | | - Clarify use of addends in MOVZ, MOVK, |
| | | and ADRP |
+---------------+--------------------+-----------------------------------------+
| 2024Q4 | 29\ :sup:`th` | - Moved PAuthABI GOT relocations out of |
| | November 2024 | reserved space. |
+---------------+--------------------+-----------------------------------------+

References
----------
Expand Down Expand Up @@ -1696,15 +1699,51 @@ The PAuth ABI Extension defines a number of static and dynamic relocations.
The information in this document is sufficient to reserve the relocation types.
For details on the relocations and operations see `PAUTHABIELF64`_.

The ``PAUTH`` and ``ENCD`` operators are defined in `PAUTHABIELF64`_.

.. class:: aaelf64-pauth-descriptor-relocations

.. table:: PAuthABI static relocations

+------------+------------+---------------------------------+----------------------------------+-----------------------------------------------------+
| ELF64 Code | ELF32 Code | Name | Operation | Comment |
+============+============+=================================+==================================+=====================================================+
| 580 | \- | R\_<CLS>\_AUTH\_ABS64 | PAUTH(S+A) | See `PAUTHABIELF64`_ |
+------------+------------+---------------------------------+----------------------------------+-----------------------------------------------------+
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| ELF64 Code | ELF32 Code | Name | Operation | Comment |
+============+============+========================================+======================================+======================+
| 580 | \- | R\_<CLS>\_AUTH\_ABS64 | PAUTH(S+A) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 581 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G0 | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 582 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G0\_NC | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 583 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G1 | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 584 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G1\_NC | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 585 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G2 | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 586 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G2\_NC | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 587 | \- | R\_AARCH64\_AUTH\_MOVW\_GOTOFF\_G3 | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 588 | \- | R\_AARCH64\_AUTH\_GOT\_LD\_PREL19 | G(ENCD(GDAT(S))) - P | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 589 | \- | R\_AARCH64\_AUTH\_LD64\_GOTOFF\_LO15 | G(ENCD(GDAT(S))) - GOT | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 590 | \- | R\_AARCH64\_AUTH\_ADR\_GOT\_PAGE | G(ENCD(GDAT(S))) - Page(P) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 591 | \- | R\_AARCH64\_AUTH\_LD64\_GOT\_LO12_NC | G(ENCD(GDAT(S))) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 592 | \- | R\_AARCH64\_AUTH\_LD64\_GOTPAGE\_LO15 | G(ENCD(GDAT(S))) - Page(GOT) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 593 | \- | R\_AARCH64\_AUTH\_GOT\_ADD_LO12_NC | G(ENCD(GDAT(S))) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 594 | \- | R\_AARCH64\_AUTH\_GOT\_ADR\_PREL\_LO21 | G(ENCD(GDAT(S))) - P | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 595 | \- | R\_AARCH64\_AUTH\_TLSDESC\_ADR\_PAGE21 | Page(G(ENCD(GTLSDESC(S)))) - Page(P) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 596 | \- | R\_AARCH64\_AUTH\_TLSDESC\_LD64\_LO12 | G(ENCD(GTLSDESC(S))) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+
| 597 | \- | R\_AARCH64\_AUTH\_TLSDESC\_ADD\_LO12 | G(ENCD(GTLSDESC(S))) | See `PAUTHABIELF64`_ |
+------------+------------+----------------------------------------+--------------------------------------+----------------------+

Dynamic relocations
^^^^^^^^^^^^^^^^^^^
Expand All @@ -1715,39 +1754,45 @@ The dynamic relocations for those execution environments that support only a lim

.. table:: Dynamic relocations

+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| ELF64 Code | ELF32 Code | Name | Operation | Comment |
+============+============+==========================+=================================+===========================================+
| 257 | \- | R\_<CLS>\_ABS64 | S + A | See note below. |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| \- | 1 | R\_<CLS>\_ABS32 | S + A | See note below. |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 580 | \- | R\_<CLS>\_AUTH\_ABS64 | SIGN(S + A, SCHEMA(\*P)) | See note below. |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1024 | 180 | R\_<CLS>\_COPY | | See note below. |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1025 | 181 | R\_<CLS>\_GLOB\_DAT | S + A | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1026 | 182 | R\_<CLS>\_JUMP\_SLOT | S + A | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1027 | 183 | R\_<CLS>\_RELATIVE | Delta(S) + A | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1028 | 184 | R\_<CLS>\_TLS\_IMPDEF1 | | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1029 | 185 | R\_<CLS>\_TLS\_IMPDEF2 | | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| | | R\_<CLS>\_TLS\_DTPREL | DTPREL(S+A) | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| | | R\_<CLS>\_TLS\_DTPMOD | LDM(S) | See note below |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1030 | 186 | R\_<CLS>\_TLS\_TPREL | TPREL(S+A) | |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1031 | 187 | R\_<CLS>\_TLSDESC | TLSDESC(S+A) | Identifies a TLS descriptor to be filled |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1032 | 188 | R\_<CLS>\_IRELATIVE | Indirect(Delta(S) + A) | See note below. |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
| 1041 | \- | R\_<CLS>\_AUTH\_RELATIVE | SIGN(DELTA(S) + A, SCHEMA(\*P)) | See note below. |
+------------+------------+--------------------------+---------------------------------+-------------------------------------------+
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| ELF64 Code | ELF32 Code | Name | Operation | Comment |
+============+============+=============================+====================================+===========================================+
| 257 | \- | R\_<CLS>\_ABS64 | S + A | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| \- | 1 | R\_<CLS>\_ABS32 | S + A | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 580 | \- | R\_<CLS>\_AUTH\_ABS64 | SIGN(S + A, SCHEMA(\*P)) | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1024 | 180 | R\_<CLS>\_COPY | | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1025 | 181 | R\_<CLS>\_GLOB\_DAT | S + A | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1026 | 182 | R\_<CLS>\_JUMP\_SLOT | S + A | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1027 | 183 | R\_<CLS>\_RELATIVE | Delta(S) + A | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1028 | 184 | R\_<CLS>\_TLS\_IMPDEF1 | | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1029 | 185 | R\_<CLS>\_TLS\_IMPDEF2 | | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| | | R\_<CLS>\_TLS\_DTPREL | DTPREL(S+A) | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| | | R\_<CLS>\_TLS\_DTPMOD | LDM(S) | See note below |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1030 | 186 | R\_<CLS>\_TLS\_TPREL | TPREL(S+A) | |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1031 | 187 | R\_<CLS>\_TLSDESC | TLSDESC(S+A) | Identifies a TLS descriptor to be filled |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1032 | 188 | R\_<CLS>\_IRELATIVE | Indirect(Delta(S) + A) | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1041 | \- | R\_<CLS>\_AUTH\_RELATIVE | SIGN(DELTA(S) + A, SCHEMA(\*P)) | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1042 | \- | R\_AARCH64\_AUTH\_GLOB\_DAT | SIGN((S + A), SCHEMA(\*P)) | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1043 | \- | R\_AARCH64\_AUTH\_TLSDESC | SIGN(TLSDESC(S + A), SCHEMA(\*P)) | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+
| 1044 | \- | R\_AARCH64\_AUTH\_IRELATIVE | SIGN(Indirect(S + A), SCHEMA(\*P)) | See note below. |
+------------+------------+-----------------------------+------------------------------------+-------------------------------------------+

With the exception of ``R_<CLS>_COPY`` all dynamic relocations require that the place being relocated is an 8-byte aligned 64-bit data location in ELF64 or a 4-byte aligned 32-bit data location in ELF32.

Expand Down Expand Up @@ -1779,7 +1824,7 @@ Relocations ``R_AARCH64_TLS_DTPREL``, ``R_AARCH64_TLS_DTPMOD`` and ``R_AARCH64_T

It is implementation defined whether ``R_<CLS>_TLS_IMPDEF1`` implements ``R_<CLS>_TLS_DTPREL`` and ``R_<CLS>_TLS_IMPDEF2`` implements ``R_<CLS>_TLS_DTPMOD`` or whether ``R_<CLS>_TLS_IMPDEF1`` implements ``R_<CLS>_TLS_DTPMOD`` and ``R_<CLS>_TLS_IMPDEF2`` implements ``R_<CLS>_TLS_DTPREL``; a platform must document its choice\ [#aaelf64-f1]_.

``R\_<CLS>\_AUTH\_ABS64`` and ``R\_<CLS>\_AUTH\_RELATIVE`` are part of the PAuth ABI Extension. For details on the relocations and operations see `PAUTHABIELF64`_. Note that ``R\_<CLS>\_AUTH\_ABS64`` is both a static and a dynamic relocation.
``R\_<CLS>\_AUTH\_ABS64``, ``R\_<CLS>\_AUTH\_RELATIVE``, ``R\_AARCH64\_AUTH\_GLOB\_DAT``, ``R\_AARCH64\_AUTH\_TLSDESC`` and ``R\_AARCH64\_AUTH\_IRELATIVE`` are part of the PAuth ABI Extension. For details on the relocations and operations see `PAUTHABIELF64`_. Note that ``R\_<CLS>\_AUTH\_ABS64`` is both a static and a dynamic relocation.

Private and platform-specific relocations
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Expand Down
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