[lanai] Add ELF enum value and relocations.

Add ELF enum value and relocations for Lanai backed.

General Lanai backend discussion on llvm-dev thread "[RFC] Lanai backend" (http://lists.llvm.org/pipermail/llvm-dev/2016-February/095118.html).

Differential Revision: http://reviews.llvm.org/D17008

llvm-svn: 262394

4 files changed, 48 insertions, 0 deletions

diff --git a/llvm/include/llvm/Object/ELFObjectFile.h b/llvm/include/llvm/Object/ELFObjectFile.h
index 5d826da4c2f..d927aace242 100644
--- a/llvm/include/llvm/Object/ELFObjectFile.h
+++ b/llvm/include/llvm/Object/ELFObjectFile.h
@@ -835,6 +835,8 @@ StringRef ELFObjectFile<ELFT>::getFileFormatName() const {
       return "ELF32-avr";
     case ELF::EM_HEXAGON:
       return "ELF32-hexagon";
+    case ELF::EM_LANAI:
+      return "ELF32-lanai";
     case ELF::EM_MIPS:
       return "ELF32-mips";
     case ELF::EM_PPC:
@@ -891,6 +893,8 @@ unsigned ELFObjectFile<ELFT>::getArch() const {
     return Triple::avr;
   case ELF::EM_HEXAGON:
     return Triple::hexagon;
+  case ELF::EM_LANAI:
+    return Triple::lanai;
   case ELF::EM_MIPS:
     switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
     case ELF::ELFCLASS32:
diff --git a/llvm/include/llvm/Object/RelocVisitor.h b/llvm/include/llvm/Object/RelocVisitor.h
index d5e4258cb0a..f171f8e1fd4 100644
--- a/llvm/include/llvm/Object/RelocVisitor.h
+++ b/llvm/include/llvm/Object/RelocVisitor.h
@@ -175,6 +175,14 @@ private:
         case llvm::ELF::R_ARM_ABS32:
           return visitELF_ARM_ABS32(R, Value);
         }
+      case Triple::lanai:
+        switch (RelocType) {
+        case llvm::ELF::R_LANAI_32:
+          return visitELF_Lanai_32(R, Value);
+        default:
+          HasError = true;
+          return RelocToApply();
+        }
       case Triple::mipsel:
       case Triple::mips:
         switch (RelocType) {
@@ -311,6 +319,13 @@ private:
     return RelocToApply(Res, 4);
   }
 
+  /// Lanai ELF
+  RelocToApply visitELF_Lanai_32(RelocationRef R, uint64_t Value) {
+    int64_t Addend = getELFAddend(R);
+    uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
+    return RelocToApply(Res, 4);
+  }
+
   /// MIPS ELF
   RelocToApply visitELF_MIPS_32(RelocationRef R, uint64_t Value) {
     uint32_t Res = Value & 0xFFFFFFFF;
diff --git a/llvm/include/llvm/Support/ELF.h b/llvm/include/llvm/Support/ELF.h
index 775bf99662b..26354dc1b9b 100644
--- a/llvm/include/llvm/Support/ELF.h
+++ b/llvm/include/llvm/Support/ELF.h
@@ -315,6 +315,11 @@ enum {
   // such numbers for an official value for WebAssembly. As soon as one is
   // allocated, this enum will be updated to use it.
   EM_WEBASSEMBLY   = 0x4157, // WebAssembly architecture
+
+  // A request has been made to the maintainer of the official registry for
+  // an official value for Lanai. As soon as one is allocated, this enum will be
+  // updated to use it.
+  EM_LANAI         = 0x8123, // Lanai 32-bit processor
 };
 
 // Object file classes.
@@ -589,6 +594,11 @@ enum {
 #include "ELFRelocs/Hexagon.def"
 };
 
+// ELF Relocation type for Lanai.
+enum {
+#include "ELFRelocs/Lanai.def"
+};
+
 // ELF Relocation types for S390/zSeries
 enum {
 #include "ELFRelocs/SystemZ.def"
diff --git a/llvm/include/llvm/Support/ELFRelocs/Lanai.def b/llvm/include/llvm/Support/ELFRelocs/Lanai.def
new file mode 100644
index 00000000000..77ecb048403
--- /dev/null
+++ b/llvm/include/llvm/Support/ELFRelocs/Lanai.def
@@ -0,0 +1,19 @@
+
+#ifndef ELF_RELOC
+#error "ELF_RELOC must be defined"
+#endif
+
+// No relocation
+ELF_RELOC(R_LANAI_NONE,        0)
+// 21-bit symbol relocation
+ELF_RELOC(R_LANAI_21,          1)
+// 21-bit symbol relocation with last two bits masked to 0
+ELF_RELOC(R_LANAI_21_F,        2)
+// 25-bit branch targets
+ELF_RELOC(R_LANAI_25,          3)
+// General 32-bit relocation
+ELF_RELOC(R_LANAI_32,          4)
+// Upper 16-bits of a symbolic relocation
+ELF_RELOC(R_LANAI_HI16,        5)
+// Lower 16-bits of a symbolic relocation
+ELF_RELOC(R_LANAI_LO16,        6)