| commit | 136b5067acc43b65ef4d32f5fc21b8c0e284ee3a | [log] [tgz] |
|---|---|---|
| author | Ghanan Gowripalan <ghanan@fuchsia.infra.roller.google.com> | Thu May 16 19:00:05 2024 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu May 16 12:01:33 2024 -0700 |
| tree | 5b9b8a1373c63a1e45cb9596cea85c43e1c2164d | |
| parent | d4e9c864c724d398eb2d1b9848d0137a28eb3bea [diff] |
[roll] Roll fuchsia [starnix/usercopy] Introduce ASM `hermetic_zero` Currently, we build `hermetic_zero` from C++ source, but the hermetic zero error path assumes certain behaviour of the `hermetic_zero` implementation (see `hermetic_copy_error`. Compiling from C++ source is brittle because the generated assembly may change across toolchain updates. In fact, we have observed breakages several times. Now that the `hermetic_zero` is stable and we are not iterating on it anymore, provide an assembly variant of it that we can build from so that future toolchain updates do not break the build and, most importantly, we can explicitly provide the hermetic zero error path the guarantees/behaviours it expects. Note that we keep the `hermetic_zero` C++ source in tree as a reference. A later change will remove its `hermetic_code_blob` target from the regular build graph and likely move it to a test-only build target. Original-Bug: b/338636637 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1045755 Original-Revision: d4946c76d610f7ed056e0d59770247001e7ea2f9 GitOrigin-RevId: 85e97c767c78cf6b1b179f3637a662ccae34130f Change-Id: I1903931463e06bd67311188b700ff6e0dcc5be80
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