[PAL/Linux-SGX] Prepare AEX handler to call C code in release mode #2025
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Previously, the AEX handler only called C code (more specific to our use case, the code that works on the untrusted-thread stack) for SGX profiling logic and only when Gramine was built in debug mode. As a preparation for AEX Notify support, this commit modifies the AEX handler such that it can call C code when Gramine is built in release mode. Also, the AEX handler logic is not restricted to SGX profiling only, so the `_PROF`/`_prof` suffixes in related function and variable names are removed. This commit also adds two small prerequisites for AEX Notify: (1) `eenter_pointer` helper so that signal handling logic can learn whether an exception happened at EENTER instruction, and (2) dummy function `maybe_raise_pending_signal` that will be populated in a later commit. Signed-off-by: Dmitrii Kuvaiskii <[email protected]>
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pal/src/host/linux-sgx/host_entry.S line 18 at r1 (raw file):
.extern tcs_base .extern g_in_aex_profiling
tcs_base and g_in_aex_profiling don't exist (some historic artifacts). Removed them, though they are unrelated to this PR.
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Reviewable status: 0 of 6 files reviewed, 1 unresolved discussion, not enough approvals from maintainers (2 more required), not enough approvals from different teams (1 more required, approved so far: Intel)
-- commits line 8 at r1:
Here and everywhere: the correct spelling is AEX-Notify, with a dash. Change.
Description of the changes
Part 1 in AEX-Notify series.
Previously, the AEX handler only called C code (more specific to our use case, the code that works on the untrusted-thread stack) for SGX profiling logic and only when Gramine was built in debug mode.
As a preparation for AEX-Notify support, this commit modifies the AEX handler such that it can call C code when Gramine is built in release mode. Also, the AEX handler logic is not restricted to SGX profiling only, so the
_PROF/_profsuffixes in related function and variable names are removed.This commit also adds two small prerequisites for AEX-Notify: (1)
eenter_pointerhelper so that signal handling logic can learn whether an exception happened at EENTER instruction, and (2) dummy functionmaybe_raise_pending_signalthat will be populated in a later commit.See also related PRs and discussions:
How to test this PR?
CI is enough.
This change is