[PATCH] D119592: Insert a blurb about the -fzero-call-used-regs feature

Bill Wendling via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Fri Feb 11 13:46:27 PST 2022

void created this revision.
void added reviewers: nickdesaulniers, kees.
void requested review of this revision.
Herald added a project: clang.
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Index: clang/docs/ReleaseNotes.rst
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -47,7 +47,12 @@
 Major New Features
--  ...
+- Clang now supports the ``-fzero-call-used-regs`` feature for x86. The purpose
+  of this feature is to limit Return-Oriented Programming (ROP) exploits and
+  information leakage. It works by zeroing out a selected class of registers
+  before function return --- e.g., all GPRs that are used within the function.
+  There is an analogous ``zero_call_used_regs`` attribute to allow for finer
+  control of this feature.
 Improvements to Clang's diagnostics

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