1 files changed, 26 insertions, 7 deletions
diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.cpp b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.cpp
index e1d6dd7a056b..dc5383ce941e 100644
--- a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.cpp
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.cpp
@@ -58,8 +58,17 @@ void AArch64TargetStreamer::finish() {
     emitNoteSection(ELF::GNU_PROPERTY_AARCH64_FEATURE_1_BTI);
 }
 
-void AArch64TargetStreamer::emitNoteSection(unsigned Flags) {
-  if (Flags == 0)
+void AArch64TargetStreamer::emitNoteSection(unsigned Flags,
+                                            uint64_t PAuthABIPlatform,
+                                            uint64_t PAuthABIVersion) {
+  assert((PAuthABIPlatform == uint64_t(-1)) ==
+         (PAuthABIVersion == uint64_t(-1)));
+  uint64_t DescSz = 0;
+  if (Flags != 0)
+    DescSz += 4 * 4;
+  if (PAuthABIPlatform != uint64_t(-1))
+    DescSz += 4 + 4 + 8 * 2;
+  if (DescSz == 0)
     return;
 
   MCStreamer &OutStreamer = getStreamer();
@@ -80,15 +89,25 @@ void AArch64TargetStreamer::emitNoteSection(unsigned Flags) {
   // Emit the note header.
   OutStreamer.emitValueToAlignment(Align(8));
   OutStreamer.emitIntValue(4, 4);     // data size for "GNU\0"
-  OutStreamer.emitIntValue(4 * 4, 4); // Elf_Prop size
+  OutStreamer.emitIntValue(DescSz, 4); // Elf_Prop array size
   OutStreamer.emitIntValue(ELF::NT_GNU_PROPERTY_TYPE_0, 4);
   OutStreamer.emitBytes(StringRef("GNU", 4)); // note name
 
   // Emit the PAC/BTI properties.
-  OutStreamer.emitIntValue(ELF::GNU_PROPERTY_AARCH64_FEATURE_1_AND, 4);
-  OutStreamer.emitIntValue(4, 4);     // data size
-  OutStreamer.emitIntValue(Flags, 4); // data
-  OutStreamer.emitIntValue(0, 4);     // pad
+  if (Flags != 0) {
+    OutStreamer.emitIntValue(ELF::GNU_PROPERTY_AARCH64_FEATURE_1_AND, 4);
+    OutStreamer.emitIntValue(4, 4);     // data size
+    OutStreamer.emitIntValue(Flags, 4); // data
+    OutStreamer.emitIntValue(0, 4);     // pad
+  }
+
+  // Emit the PAuth ABI compatibility info
+  if (PAuthABIPlatform != uint64_t(-1)) {
+    OutStreamer.emitIntValue(ELF::GNU_PROPERTY_AARCH64_FEATURE_PAUTH, 4);
+    OutStreamer.emitIntValue(8 * 2, 4); // data size
+    OutStreamer.emitIntValue(PAuthABIPlatform, 8);
+    OutStreamer.emitIntValue(PAuthABIVersion, 8);
+  }
 
   OutStreamer.endSection(Nt);
   OutStreamer.switchSection(Cur);