[llvm-readobj] Support GNU_PROPERTY_X86_FEATURE_1_AND notes in .note.gnu.property

This patch allows parsing GNU_PROPERTY_X86_FEATURE_1_AND
notes in .note.gnu.property sections. These notes
indicate that the object file is built to support Intel CET.

patch by mike.dvoretsky

Differential Revision: https://reviews.llvm.org/D47473

llvm-svn: 333424

1 files changed, 31 insertions, 1 deletions

diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 6ca28e273cc..4acd9be547b 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -3457,7 +3457,7 @@ static void printGNUProperty(raw_ostream &OS, uint32_t Type, uint32_t DataSize,
   case GNU_PROPERTY_STACK_SIZE: {
     OS << "    stack size: ";
     if (DataSize == sizeof(typename ELFT::uint))
-      OS << format("0x%x\n",
+      OS << format("0x%lx\n",
                    (uint64_t)(*(const typename ELFT::Addr *)Data.data()));
     else
       OS << format("<corrupt length: 0x%x>\n", DataSize);
@@ -3469,6 +3469,36 @@ static void printGNUProperty(raw_ostream &OS, uint32_t Type, uint32_t DataSize,
       OS << format(" <corrupt length: 0x%x>", DataSize);
     OS << "\n";
     break;
+  case GNU_PROPERTY_X86_FEATURE_1_AND:
+    OS << "    X86 features: ";
+    if (DataSize != 4 && DataSize != 8) {
+      OS << format("<corrupt length: 0x%x>\n", DataSize);
+      break;
+    }
+    uint64_t CFProtection =
+        (DataSize == 4)
+            ? support::endian::read32<ELFT::TargetEndianness>(Data.data())
+            : support::endian::read64<ELFT::TargetEndianness>(Data.data());
+    if (CFProtection == 0) {
+      OS << "none\n";
+      break;
+    }
+    if (CFProtection & GNU_PROPERTY_X86_FEATURE_1_IBT) {
+      OS << "IBT";
+      CFProtection &= ~GNU_PROPERTY_X86_FEATURE_1_IBT;
+      if (CFProtection)
+        OS << ", ";
+    }
+    if (CFProtection & GNU_PROPERTY_X86_FEATURE_1_SHSTK) {
+      OS << "SHSTK";
+      CFProtection &= ~GNU_PROPERTY_X86_FEATURE_1_SHSTK;
+      if (CFProtection)
+        OS << ", ";
+    }
+    if (CFProtection)
+      OS << format("<unknown flags: 0x%lx>", CFProtection);
+    OS << "\n";
+    break;
   }
 }