ARM: support FK_SecRel_2 relocations on WoA

This adds FK_SecRel_2 relocation support to ARM.  This enables the building of
object files for armv7-windows-msvc which enables CodeView line tables for
debugging as opposed to armv7-windows-itanium which currently uses DWARF.

llvm-svn: 208273

2 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
index 900c7ca5b42..93ec46df07f 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -344,6 +344,8 @@ static unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
   case FK_Data_2:
   case FK_Data_4:
     return Value;
+  case FK_SecRel_2:
+    return Value;
   case FK_SecRel_4:
     return Value;
   case ARM::fixup_arm_movt_hi16:
@@ -674,6 +676,8 @@ static unsigned getFixupKindNumBytes(unsigned Kind) {
   case ARM::fixup_t2_movw_lo16:
     return 4;
 
+  case FK_SecRel_2:
+    return 2;
   case FK_SecRel_4:
     return 4;
   }
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFObjectWriter.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFObjectWriter.cpp
index e3e6802fd3c..ba9df6e962c 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFObjectWriter.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFObjectWriter.cpp
@@ -49,6 +49,8 @@ unsigned ARMWinCOFFObjectWriter::getRelocType(const MCValue &Target,
     default:
       return COFF::IMAGE_REL_ARM_ADDR32;
     }
+  case FK_SecRel_2:
+    return COFF::IMAGE_REL_ARM_SECTION;
   case FK_SecRel_4:
     return COFF::IMAGE_REL_ARM_SECREL;
   case ARM::fixup_t2_condbranch: