From 3bc8a765a98015e6d55510b6ea6e387cbfd793cd Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 12 Jul 2006 21:23:20 +0000
Subject: [PATCH] Implement PPC64 relocations types

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29125 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCCodeEmitter.cpp | 23 ++++++++++++++++++++---
 lib/Target/PowerPC/PPCJITInfo.cpp     | 12 +++++++++++-
 lib/Target/PowerPC/PPCRelocations.h   |  6 +++++-
 3 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/lib/Target/PowerPC/PPCCodeEmitter.cpp b/lib/Target/PowerPC/PPCCodeEmitter.cpp
index f5ea746743a..76dc349b50c 100644
--- a/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -162,16 +162,23 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
       switch (MI.getOpcode()) {
       default: DEBUG(MI.dump()); assert(0 && "Unknown instruction for relocation!");
       case PPC::LIS:
+      case PPC::LIS8:
+      case PPC::ADDIS8:
         Reloc = PPC::reloc_absolute_high;       // Pointer to symbol
         break;
       case PPC::LI:
+      case PPC::LI8:
       case PPC::LA:
+      // Loads.
       case PPC::LBZ:
       case PPC::LHA:
       case PPC::LHZ:
       case PPC::LWZ:
       case PPC::LFS:
       case PPC::LFD:
+      case PPC::LWZ8:
+      
+      // Stores.
       case PPC::STB:
       case PPC::STH:
       case PPC::STW:
@@ -179,6 +186,13 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
       case PPC::STFD:
         Reloc = PPC::reloc_absolute_low;
         break;
+
+      case PPC::LWA:
+      case PPC::LD:
+      case PPC::STD:
+      case PPC::STD_32:
+        Reloc = PPC::reloc_absolute_low_ix;
+        break;
       }
     }
     if (MO.isGlobalAddress())
@@ -197,16 +211,19 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
       rv = MCE.getJumpTableEntryAddress(MO.getJumpTableIndex());
 
     unsigned Opcode = MI.getOpcode();
-    if (Opcode == PPC::LIS || Opcode == PPC::ADDIS) {
+    if (Opcode == PPC::LIS || Opcode == PPC::LIS8 ||
+        Opcode == PPC::ADDIS || Opcode == PPC::ADDIS8) {
       // lis wants hi16(addr)
       if ((short)rv < 0) rv += 1 << 16;
       rv >>= 16;
-    } else if (Opcode == PPC::LWZ || Opcode == PPC::LA ||
-               Opcode == PPC::LI ||
+    } else if (Opcode == PPC::LWZ || Opcode == PPC::LWZ8 ||
+               Opcode == PPC::LA ||
+               Opcode == PPC::LI  || Opcode == PPC::LI8 ||
                Opcode == PPC::LFS || Opcode == PPC::LFD) {
       // These load opcodes want lo16(addr)
       rv &= 0xffff;
     } else {
+      MI.dump();
       assert(0 && "Unknown constant pool or jump table using instruction!");
     }
   } else {
diff --git a/lib/Target/PowerPC/PPCJITInfo.cpp b/lib/Target/PowerPC/PPCJITInfo.cpp
index 98bc4e1fb99..1d4760affaf 100644
--- a/lib/Target/PowerPC/PPCJITInfo.cpp
+++ b/lib/Target/PowerPC/PPCJITInfo.cpp
@@ -207,7 +207,7 @@ void PPCJITInfo::relocate(void *Function, MachineRelocation *MR,
     case PPC::reloc_absolute_ptr_high: // Pointer relocations.
     case PPC::reloc_absolute_ptr_low:
     case PPC::reloc_absolute_high:     // high bits of ref -> low 16 of instr
-    case PPC::reloc_absolute_low:      // low bits of ref  -> low 16 of instr
+    case PPC::reloc_absolute_low: {    // low bits of ref  -> low 16 of instr
       ResultPtr += MR->getConstantVal();
 
       // If this is a high-part access, get the high-part.
@@ -227,6 +227,16 @@ void PPCJITInfo::relocate(void *Function, MachineRelocation *MR,
       *RelocPos = LowBits | HighBits;  // Slam into low 16-bits
       break;
     }
+    case PPC::reloc_absolute_low_ix: {  // low bits of ref  -> low 14 of instr
+      ResultPtr += MR->getConstantVal();
+      // Do the addition then mask, so the addition does not overflow the 16-bit
+      // immediate section of the instruction.
+      unsigned LowBits  = (*RelocPos + ResultPtr) & 0xFFFC;
+      unsigned HighBits = *RelocPos & 0xFFFF0003;
+      *RelocPos = LowBits | HighBits;  // Slam into low 14-bits.
+      break;
+    }
+    }
   }
 }
 
diff --git a/lib/Target/PowerPC/PPCRelocations.h b/lib/Target/PowerPC/PPCRelocations.h
index 20d747b06d5..09115e3ebc1 100644
--- a/lib/Target/PowerPC/PPCRelocations.h
+++ b/lib/Target/PowerPC/PPCRelocations.h
@@ -34,9 +34,13 @@ namespace llvm {
       reloc_absolute_high,
 
       // reloc_absolute_low - Absolute relocation, for the la instruction (which
-      // is really an addi).  Add the low 16-bits of teh specified global
+      // is really an addi).  Add the low 16-bits of the specified global
       // address into the low 16-bits of the instruction.
       reloc_absolute_low,
+      
+      // reloc_absolute_low_ix - Absolute relocation for the 64-bit load/store
+      // instruction which have two implicit zero bits.
+      reloc_absolute_low_ix,
 
       // reloc_absolute_ptr_high - Absolute relocation for references to lazy
       // pointer stubs.  In this case, the relocated instruction should be
-- 
2.34.1