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smithp35 merged 1 commit into from
Oct 15, 2026
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[design-documents] pauthabi-tls 2026 q3 review comments #437

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34 changes: 21 additions & 13 deletions design-documents/pauthabi-tls.rst
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Expand Up @@ -26,19 +26,27 @@ TLS Dialect
-----------

The base ABI in `AAELF64`_ defines relocations for two TLS
dialects. The "traditional" dialect and the "descriptor" dialect. In
the traditional dialect global and local dynamic TLS use the
``R_AARCH64_TLSGD``, ``R_AARCH64_TLSLD`` prefixed relocations. These
create a pair of GOT entries relocated by ``R_AARCH64_TLS_DTPMOD`` and
``R_AARCH64_TLS_DTPREL``. In the "descriptor" dialect, global and local
dynamic TLS use the ``R_AARCH64_TLSDESC`` prefixed relocations. These
create a pair of GOT entries relocated by ``R_AARCH64_TLSDESC``. Local
Exec and Initial Exec TLS are handled the same way in both dialects.

The `PAUTHABIELF64`_ only supports the descriptor based dialect,
primarily because the traditional dialect is now legacy. GCC defaults
to the "descriptor" dialect and clang only supports the "descriptor"
based dialect.
dialects:

* The "traditional" dialect.

In the "traditional" dialect global and local dynamic TLS use the
``R_AARCH64_TLSGD``, ``R_AARCH64_TLSLD`` prefixed relocations. These
create a pair of GOT entries relocated by ``R_AARCH64_TLS_DTPMOD``
and ``R_AARCH64_TLS_DTPREL``.

* The "descriptor" dialect.

In the "descriptor" dialect, global and local dynamic TLS use the
``R_AARCH64_TLSDESC`` prefixed relocations. These create a pair of
GOT entries relocated by ``R_AARCH64_TLSDESC``.

Local Exec and Initial Exec TLS are handled the same way in both dialects.

The `PAUTHABIELF64`_ only supports the "descriptor" based dialect,
primarily because the "traditional" dialect is now legacy. GCC
defaults to the "descriptor" dialect and clang only supports the
"descriptor" based dialect.

Auth variant TLS relocations
----------------------------
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