https://github.com/jaidTw updated
https://github.com/llvm/llvm-project/pull/112477
>From fe4a28fb691b69d9af384f1dc2f0667761adef44 Mon Sep 17 00:00:00 2001
From: Jesse Huang <jesse.hu...@sifive.com>
Date: Sun, 13 Oct 2024 15:11:06 +0800
Subject: [PATCH 1/2] [Clang][RISCV] Support -fcf-protection=return for RISC-V
---
clang/lib/Basic/Targets/RISCV.h | 7 +++++++
clang/lib/CodeGen/CodeGenFunction.cpp | 4 ++++
2 files changed, 11 insertions(+)
diff --git a/clang/lib/Basic/Targets/RISCV.h b/clang/lib/Basic/Targets/RISCV.h
index bf40edb8683b3e..3f2cee72fc3731 100644
--- a/clang/lib/Basic/Targets/RISCV.h
+++ b/clang/lib/Basic/Targets/RISCV.h
@@ -141,6 +141,13 @@ class RISCVTargetInfo : public TargetInfo {
return true;
}
+ bool
+ checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const override {
+ if (ISAInfo->hasExtension("zimop"))
+ return true;
+ return TargetInfo::checkCFProtectionReturnSupported(Diags);
+ }
+
CFBranchLabelSchemeKind getDefaultCFBranchLabelScheme() const override {
return CFBranchLabelSchemeKind::FuncSig;
}
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp
b/clang/lib/CodeGen/CodeGenFunction.cpp
index 2306043c90f406..d8f0f7c14f6b40 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -899,6 +899,10 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
QualType RetTy,
if (CodeGenOpts.PointerAuth.IndirectGotos)
Fn->addFnAttr("ptrauth-indirect-gotos");
+ // Add return control flow integrity attributes.
+ if (CodeGenOpts.CFProtectionReturn)
+ Fn->addFnAttr("hw-shadow-stack");
+
// Apply xray attributes to the function (as a string, for now)
bool AlwaysXRayAttr = false;
if (const auto *XRayAttr = D ? D->getAttr<XRayInstrumentAttr>() : nullptr) {
>From 449c0d9500243b76eeba32a4771a77f8c849542f Mon Sep 17 00:00:00 2001
From: Jesse Huang <jesse.hu...@sifive.com>
Date: Wed, 23 Oct 2024 14:42:35 +0800
Subject: [PATCH 2/2] [Clang][RISCV] Add RISCV check for hw-shadow-stack
---
clang/lib/CodeGen/CodeGenFunction.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp
b/clang/lib/CodeGen/CodeGenFunction.cpp
index d8f0f7c14f6b40..f25b9dc4752b4c 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -900,7 +900,8 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType
RetTy,
Fn->addFnAttr("ptrauth-indirect-gotos");
// Add return control flow integrity attributes.
- if (CodeGenOpts.CFProtectionReturn)
+ if (CodeGenOpts.CFProtectionReturn &&
+ getContext().getTargetInfo().getTriple().isRISCV())
Fn->addFnAttr("hw-shadow-stack");
// Apply xray attributes to the function (as a string, for now)
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