[ELF2/PPC64] Error on R_PPC64_ADDR16 overflow

R_PPC64_ADDR16 is not a truncated relocation, and should error if the address
cannot be represented in 16 bits.

llvm-svn: 250424

lld/ELF/Target.cpp

@@ -465,7 +465,9 @@ void PPC64TargetInfo::relocateOne(uint8_t *Buf, uint8_t *BufEnd,
 
   switch (Type) {
   case R_PPC64_ADDR16:
-    write16be(L, applyPPCLo(R));
+    if (!isInt<16>(R))
+      error("Relocation R_PPC64_ADDR16 overflow");
+    write16be(L, R);
     break;
   case R_PPC64_ADDR16_DS:
     if (!isInt<16>(R))

lld/test/elf2/ppc64-addr16-error.s

@@ -0,0 +1,7 @@
+// RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux %s -o %t
+// RUN: not ld.lld2 -shared %t -o %t2 2>&1 | FileCheck %s
+// REQUIRES: ppc
+
+.short sym+65539
+
+// CHECK: Relocation R_PPC64_ADDR16 overflow