Merging MIPS GOT changeset into 3.2 release branch.

Merging r168471:

Mips direct object xgot support

This patch provides support for the MIPS relocations:

    *)  R_MIPS_GOT_HI16
    *)  R_MIPS_GOT_LO16
    *)  R_MIPS_CALL_HI16
    *)  R_MIPS_CALL_LO16

These are used for large GOT instruction sequences.

Contributer: Jack Carter

Merging r168460:

[mips] Generate big GOT code.

Merging r168458:

[mips] Simplify lowering functions in MipsISelLowering.cpp by using the helper
functions added in r168456.

Merging r168456:

[mips] Add helper functions that create nodes for computing address.

Merging r168455:

[mips] Add command line option "-mxgot".

Merging r168453:

[mips] When a node which loads from a GOT is created, pass a MachinePointerInfo
referring to a GOT entry.

Merging r168450:

[mips] Add target operand flag enums for big GOT relocations.

Merging r168448:

Add relocations used for mips big GOT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_32@169294 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 52 insertions, 2 deletions

diff --git a/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
index 9a35bb6bd7..c078794899 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -42,6 +42,8 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
   case Mips::fixup_Mips_GOT_PAGE:
   case Mips::fixup_Mips_GOT_OFST:
   case Mips::fixup_Mips_GOT_DISP:
+  case Mips::fixup_Mips_GOT_LO16:
+  case Mips::fixup_Mips_CALL_LO16:
     break;
   case Mips::fixup_Mips_PC16:
     // So far we are only using this type for branches.
@@ -60,6 +62,8 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
     break;
   case Mips::fixup_Mips_HI16:
   case Mips::fixup_Mips_GOT_Local:
+  case Mips::fixup_Mips_GOT_HI16:
+  case Mips::fixup_Mips_CALL_HI16:
     // Get the 2nd 16-bits. Also add 1 if bit 15 is 1.
     Value = ((Value + 0x8000) >> 16) & 0xffff;
     break;
@@ -179,7 +183,11 @@ public:
       { "fixup_Mips_GOT_OFST",     0,     16,   0 },
       { "fixup_Mips_GOT_DISP",     0,     16,   0 },
       { "fixup_Mips_HIGHER",       0,     16,   0 },
-      { "fixup_Mips_HIGHEST",      0,     16,   0 }
+      { "fixup_Mips_HIGHEST",      0,     16,   0 },
+      { "fixup_Mips_GOT_HI16",     0,     16,   0 },
+      { "fixup_Mips_GOT_LO16",     0,     16,   0 },
+      { "fixup_Mips_CALL_HI16",    0,     16,   0 },
+      { "fixup_Mips_CALL_LO16",    0,     16,   0 }
     };
 
     if (Kind < FirstTargetFixupKind)
diff --git a/lib/Target/Mips/MCTargetDesc/MipsBaseInfo.h b/lib/Target/Mips/MCTargetDesc/MipsBaseInfo.h
index 233214b461..94e0d20d88 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsBaseInfo.h
+++ b/lib/Target/Mips/MCTargetDesc/MipsBaseInfo.h
@@ -84,7 +84,13 @@ namespace MipsII {
     /// MO_HIGHER/HIGHEST - Represents the highest or higher half word of a
     /// 64-bit symbol address.
     MO_HIGHER,
-    MO_HIGHEST
+    MO_HIGHEST,
+
+    /// MO_GOT_HI16/LO16, MO_CALL_HI16/LO16 - Relocations used for large GOTs.
+    MO_GOT_HI16,
+    MO_GOT_LO16,
+    MO_CALL_HI16,
+    MO_CALL_LO16
   };
 
   enum {
diff --git a/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp b/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
index 5d240fe847..f82e203c23 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
@@ -179,6 +179,18 @@ unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
   case Mips::fixup_Mips_HIGHEST:
     Type = ELF::R_MIPS_HIGHEST;
     break;
+  case Mips::fixup_Mips_GOT_HI16:
+    Type = ELF::R_MIPS_GOT_HI16;
+    break;
+  case Mips::fixup_Mips_GOT_LO16:
+    Type = ELF::R_MIPS_GOT_LO16;
+    break;
+  case Mips::fixup_Mips_CALL_HI16:
+    Type = ELF::R_MIPS_CALL_HI16;
+    break;
+  case Mips::fixup_Mips_CALL_LO16:
+    Type = ELF::R_MIPS_CALL_LO16;
+    break;
   }
   return Type;
 }
diff --git a/lib/Target/Mips/MCTargetDesc/MipsFixupKinds.h b/lib/Target/Mips/MCTargetDesc/MipsFixupKinds.h
index 77faec54fb..f96390043a 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsFixupKinds.h
+++ b/lib/Target/Mips/MCTargetDesc/MipsFixupKinds.h
@@ -116,6 +116,18 @@ namespace Mips {
     // resulting in - R_MIPS_HIGHEST
     fixup_Mips_HIGHEST,
 
+    // resulting in - R_MIPS_GOT_HI16
+    fixup_Mips_GOT_HI16,
+
+    // resulting in - R_MIPS_GOT_LO16
+    fixup_Mips_GOT_LO16,
+
+    // resulting in - R_MIPS_CALL_HI16
+    fixup_Mips_CALL_HI16,
+
+    // resulting in - R_MIPS_CALL_LO16
+    fixup_Mips_CALL_LO16,
+
     // Marker
     LastTargetFixupKind,
     NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind
diff --git a/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp b/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
index 7fbdae02f4..da1e4552c9 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
@@ -287,6 +287,18 @@ getMachineOpValue(const MCInst &MI, const MCOperand &MO,
   case MCSymbolRefExpr::VK_Mips_HIGHEST:
     FixupKind = Mips::fixup_Mips_HIGHEST;
     break;
+  case MCSymbolRefExpr::VK_Mips_GOT_HI16:
+    FixupKind = Mips::fixup_Mips_GOT_HI16;
+    break;
+  case MCSymbolRefExpr::VK_Mips_GOT_LO16:
+    FixupKind = Mips::fixup_Mips_GOT_LO16;
+    break;
+  case MCSymbolRefExpr::VK_Mips_CALL_HI16:
+    FixupKind = Mips::fixup_Mips_CALL_HI16;
+    break;
+  case MCSymbolRefExpr::VK_Mips_CALL_LO16:
+    FixupKind = Mips::fixup_Mips_CALL_LO16;
+    break;
   } // switch
 
   Fixups.push_back(MCFixup::Create(0, MO.getExpr(), MCFixupKind(FixupKind)));