1 files changed, 17 insertions, 1 deletions
diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
index 21ce5785ea5e..9db746733aa3 100644
--- a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
@@ -150,6 +150,19 @@ static unsigned AdrImmBits(unsigned Value) {
   return (hi19 << 5) | (lo2 << 29);
 }
 
+static bool valueFitsIntoFixupKind(unsigned Kind, uint64_t Value) {
+  unsigned NumBits;
+  switch(Kind) {
+  case FK_Data_1: NumBits = 8; break;
+  case FK_Data_2: NumBits = 16; break;
+  case FK_Data_4: NumBits = 32; break;
+  case FK_Data_8: NumBits = 64; break;
+  default: return true;
+  }
+  return isUIntN(NumBits, Value) ||
+    isIntN(NumBits, static_cast<int64_t>(Value));
+}
+
 static uint64_t adjustFixupValue(const MCFixup &Fixup, const MCValue &Target,
                                  uint64_t Value, MCContext &Ctx,
                                  const Triple &TheTriple, bool IsResolved) {
@@ -309,11 +322,14 @@ static uint64_t adjustFixupValue(const MCFixup &Fixup, const MCValue &Target,
     if (Value & 0x3)
       Ctx.reportError(Fixup.getLoc(), "fixup not sufficiently aligned");
     return (Value >> 2) & 0x3ffffff;
-  case FK_NONE:
   case FK_Data_1:
   case FK_Data_2:
   case FK_Data_4:
   case FK_Data_8:
+    if (!valueFitsIntoFixupKind(Fixup.getTargetKind(), Value))
+      Ctx.reportError(Fixup.getLoc(), "fixup value too large for data type!");
+    LLVM_FALLTHROUGH;
+  case FK_NONE:
   case FK_SecRel_2:
   case FK_SecRel_4:
     return Value;