[PowerPC] Add option for ROP Protection
Added -mrop-protection for Power PC to turn on codegen that provides some
protection from ROP attacks.
The option is off by default and can be turned on for Power 8, Power 9 and
Power 10.
This patch is for the option only. The feature will be implemented by a later
patch.
Reviewed By: amyk
Differential Revision: https://reviews.llvm.org/D96512
GitOrigin-RevId: b80357d46e229ace904a8580e0a93e3f9b91720b
diff --git a/lib/Target/PowerPC/PPC.td b/lib/Target/PowerPC/PPC.td
index 1e6ded2..c2840eb 100644
--- a/lib/Target/PowerPC/PPC.td
+++ b/lib/Target/PowerPC/PPC.td
@@ -252,6 +252,9 @@
"Enable MMA instructions",
[FeatureP8Vector, FeatureP9Altivec,
FeaturePairedVectorMemops]>;
+def FeatureROPProtection :
+ SubtargetFeature<"rop-protection", "HasROPProtection", "false",
+ "Add ROP protection">;
def FeaturePredictableSelectIsExpensive :
SubtargetFeature<"predictable-select-expensive",
@@ -320,7 +323,8 @@
FeatureDirectMove,
FeatureICBT,
FeaturePartwordAtomic,
- FeaturePredictableSelectIsExpensive
+ FeaturePredictableSelectIsExpensive,
+ FeatureROPProtection
];
list<SubtargetFeature> P8SpecificFeatures = [FeatureAddiLoadFusion,
diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index d31195f..bf98ea8 100644
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -87,6 +87,7 @@
HasP9Vector = false;
HasP9Altivec = false;
HasMMA = false;
+ HasROPProtection = false;
HasP10Vector = false;
HasPrefixInstrs = false;
HasPCRelativeMemops = false;
diff --git a/lib/Target/PowerPC/PPCSubtarget.h b/lib/Target/PowerPC/PPCSubtarget.h
index 50d8939..04eb4a2 100644
--- a/lib/Target/PowerPC/PPCSubtarget.h
+++ b/lib/Target/PowerPC/PPCSubtarget.h
@@ -112,6 +112,7 @@
bool HasPrefixInstrs;
bool HasPCRelativeMemops;
bool HasMMA;
+ bool HasROPProtection;
bool HasFCPSGN;
bool HasFSQRT;
bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
@@ -273,6 +274,7 @@
bool hasPrefixInstrs() const { return HasPrefixInstrs; }
bool hasPCRelativeMemops() const { return HasPCRelativeMemops; }
bool hasMMA() const { return HasMMA; }
+ bool hasROPProtection() const { return HasROPProtection; }
bool pairedVectorMemops() const { return PairedVectorMemops; }
bool hasMFOCRF() const { return HasMFOCRF; }
bool hasISEL() const { return HasISEL; }
diff --git a/test/CodeGen/PowerPC/future-check-features.ll b/test/CodeGen/PowerPC/future-check-features.ll
index ce4305a..aaae108 100644
--- a/test/CodeGen/PowerPC/future-check-features.ll
+++ b/test/CodeGen/PowerPC/future-check-features.ll
@@ -1,7 +1,7 @@
-; RUN: llc -mattr=pcrelative-memops,prefix-instrs,paired-vector-memops,mma \
+; RUN: llc -mattr=pcrelative-memops,prefix-instrs,paired-vector-memops,mma,rop-protection \
; RUN: -verify-machineinstrs -mtriple=powerpc64le-unknown-unknown \
; RUN: -ppc-asm-full-reg-names %s -o - 2>&1 | FileCheck %s
-; RUN: llc -mattr=pcrelative-memops,prefix-instrs,paired-vector-memops,mma \
+; RUN: llc -mattr=pcrelative-memops,prefix-instrs,paired-vector-memops,mma,rop-protection \
; RUN: -verify-machineinstrs -mtriple=powerpc64-unknown-unknown \
; RUN: -ppc-asm-full-reg-names %s -o - 2>&1 | FileCheck %s
