From f65a21a4ecc2e712c700c59842b6b9a1d2a9a060 Mon Sep 17 00:00:00 2001
From: Daniil Kovalev <dkovalev@accesssoftek.com>
Date: Mon, 16 Dec 2024 10:24:09 +0300
Subject: [PAC][ELF][AArch64] Support signed personality function pointer
 (#119361)

Re-apply #113148 after revert in #119331

If function pointer signing is enabled, sign personality function
pointer stored in `.DW.ref.__gxx_personality_v0` section with IA key,
0x7EAD = `ptrauth_string_discriminator("personality")` constant
discriminator and address diversity enabled.
---
 clang/lib/CodeGen/CodeGenModule.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'clang/lib/CodeGen/CodeGenModule.cpp')

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index d3d5c07..841fb1c 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1218,6 +1218,9 @@ void CodeGenModule::Release() {
       getModule().addModuleFlag(llvm::Module::Min, "ptrauth-elf-got", 1);
 
     if (getTriple().isOSLinux()) {
+      if (LangOpts.PointerAuthCalls)
+        getModule().addModuleFlag(llvm::Module::Min, "ptrauth-sign-personality",
+                                  1);
       assert(getTriple().isOSBinFormatELF());
       using namespace llvm::ELF;
       uint64_t PAuthABIVersion =
-- 
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