[Mips] Handle one byte unsupported relocations

Fail gracefully instead of crashing upon encountering
this type of relocation.

Differential revision: https://reviews.llvm.org/D41857

llvm-svn: 322266

llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp

@@ -225,6 +225,8 @@ unsigned MipsELFObjectWriter::getRelocType(MCContext &Ctx,
   switch (Kind) {
   case Mips::fixup_Mips_NONE:
     return ELF::R_MIPS_NONE;
+  case FK_Data_1:
+    report_fatal_error("MIPS does not support one byte relocations");
   case Mips::fixup_Mips_16:
   case FK_Data_2:
     return IsPCRel ? ELF::R_MIPS_PC16 : ELF::R_MIPS_16;

llvm/test/MC/Mips/unsupported-relocation.s

@@ -0,0 +1,13 @@
+# RUN: not llvm-mc -triple mips-unknown-linux -filetype=obj %s 2>%t
+# RUN: FileCheck %s < %t
+
+# Check that we emit an error for unsupported relocations instead of crashing.
+
+        .globl x
+
+        .data
+foo:
+        .byte   x
+        .byte   x+1
+
+# CHECK: LLVM ERROR: MIPS does not support one byte relocations