[PATCH] [mips][mcjit] Add support for R_MIPS_PC32.

[Daniel Sanders]

Hi petarj,

This allows us to resolve relocations for DW_EH_PE_pcrel TType encodings
in the exception handling LSDA.

Also fixed a nearby typo.

http://reviews.llvm.org/D10127

Files:
  lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
  test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s

Index: lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
===================================================================
--- lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
+++ lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
@@ -480,7 +480,7 @@
   uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
   Value += Addend;
 
-  DEBUG(dbgs() << "resolveMipselocation, LocalAddress: "
+  DEBUG(dbgs() << "resolveMIPSRelocation, LocalAddress: "
                << Section.Address + Offset << " FinalAddress: "
                << format("%p", Section.LoadAddress + Offset) << " Value: "
                << format("%x", Value) << " Type: " << format("%x", Type)
@@ -504,6 +504,10 @@
   case ELF::R_MIPS_LO16:
     *TargetPtr = ((*TargetPtr) & 0xffff0000) | (Value & 0xffff);
     break;
+  case ELF::R_MIPS_PC32:
+    uint32_t FinalAddress = (Section.LoadAddress + Offset);
+    writeBytesUnaligned(Value + Addend - FinalAddress, (uint8_t *)TargetPtr, 4);
+    break;
   }
 }
 
Index: test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s
===================================================================
--- test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s
+++ test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s
@@ -12,6 +12,12 @@
         .word foo
 # rtdyld-check: *{4}(R_MIPS_32+4) = foo
         .4byte foo
+# rtdyld-check: *{4}(R_MIPS_PC32) = foo - R_MIPS_PC32
+R_MIPS_PC32:
+        .word foo-.
+# rtdyld-check: *{4}(R_MIPS_PC32 + 4) = foo - tmp1
+tmp1:
+        .4byte foo-tmp1
 
 	.text
 	.abicalls

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