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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ARM BTI support - No BTI after setjmp"
href="https://bugs.llvm.org/show_bug.cgi?id=49544">49544</a>
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<th>Summary</th>
<td>ARM BTI support - No BTI after setjmp
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>11.0
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>other
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>baptiste.gourdin@trustonic.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>When enabling the -mbranch-protection={bti,standard} option in Clang, BTI/PAC
instruction are well inserted at each function entry, which works well.
However, the setjmp/longjmp API is not supported while it is in the GNU GCC
compiler (see <a href="https://gcc.gnu.org/legacy-ml/gcc-patches/2018-11/msg02472.html">https://gcc.gnu.org/legacy-ml/gcc-patches/2018-11/msg02472.html</a>).
To work properly, a BTI instruction must be added after each call to setjmp
function. I have not found any reference to similar in Clang.
While this code is under fixing, is it possible to build a Clang/LLVM module to
add instruction right after these setjmp calls ?</pre>
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