[llvm] r238844 - [mips][mcjit] Add support for R_MIPS_PC32.

[Daniel Sanders]

Author: dsanders
Date: Tue Jun  2 10:28:29 2015
New Revision: 238844

URL: http://llvm.org/viewvc/llvm-project?rev=238844&view=rev
Log:
[mips][mcjit] Add support for R_MIPS_PC32.

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

Also fixed a nearby typo.

Reviewers: petarj, vkalintiris

Reviewed By: vkalintiris

Subscribers: vkalintiris, llvm-commits

Differential Revision: http://reviews.llvm.org/D10127

Modified:
    llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
    llvm/trunk/test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s

Modified: llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp?rev=238844&r1=238843&r2=238844&view=diff
==============================================================================
--- llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp (original)
+++ llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp Tue Jun  2 10:28:29 2015
@@ -480,7 +480,7 @@ void RuntimeDyldELF::resolveMIPSRelocati
   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 @@ void RuntimeDyldELF::resolveMIPSRelocati
   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;
   }
 }
 

Modified: llvm/trunk/test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s?rev=238844&r1=238843&r2=238844&view=diff
==============================================================================
--- llvm/trunk/test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s (original)
+++ llvm/trunk/test/ExecutionEngine/RuntimeDyld/Mips/ELF_O32_PIC_relocations.s Tue Jun  2 10:28:29 2015
@@ -8,6 +8,12 @@ R_MIPS_32:
         .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