1 files changed, 151 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCMachOWriterInfo.cpp b/lib/Target/PowerPC/PPCMachOWriterInfo.cpp
new file mode 100644
index 0000000..3bfa6d7
--- /dev/null
+++ b/lib/Target/PowerPC/PPCMachOWriterInfo.cpp
@@ -0,0 +1,151 @@
+//===-- PPCMachOWriterInfo.cpp - Mach-O Writer Info for the PowerPC -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements Mach-O writer information for the PowerPC backend.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PPCMachOWriterInfo.h"
+#include "PPCRelocations.h"
+#include "PPCTargetMachine.h"
+#include "llvm/CodeGen/MachORelocation.h"
+#include "llvm/Support/OutputBuffer.h"
+#include <cstdio>
+using namespace llvm;
+
+PPCMachOWriterInfo::PPCMachOWriterInfo(const PPCTargetMachine &TM)
+  : TargetMachOWriterInfo(TM.getTargetData()->getPointerSizeInBits() == 64 ?
+                          HDR_CPU_TYPE_POWERPC64 :
+                          HDR_CPU_TYPE_POWERPC,
+                          HDR_CPU_SUBTYPE_POWERPC_ALL) {}
+PPCMachOWriterInfo::~PPCMachOWriterInfo() {}
+
+/// GetTargetRelocation - For the MachineRelocation MR, convert it to one or
+/// more PowerPC MachORelocation(s), add the new relocations to the
+/// MachOSection, and rewrite the instruction at the section offset if required
+/// by that relocation type.
+unsigned PPCMachOWriterInfo::GetTargetRelocation(MachineRelocation &MR,
+                                                 unsigned FromIdx,
+                                                 unsigned ToAddr,
+                                                 unsigned ToIdx,
+                                                 OutputBuffer &RelocOut,
+                                                 OutputBuffer &SecOut,
+                                                 bool Scattered,
+                                                 bool isExtern) const {
+  unsigned NumRelocs = 0;
+  uint64_t Addr = 0;
+
+  // Get the address of whatever it is we're relocating, if possible.
+  if (!isExtern)
+    Addr = (uintptr_t)MR.getResultPointer() + ToAddr;
+
+  switch ((PPC::RelocationType)MR.getRelocationType()) {
+  default: assert(0 && "Unknown PPC relocation type!");
+  case PPC::reloc_absolute_low_ix:
+    assert(0 && "Unhandled PPC relocation type!");
+    break;
+  case PPC::reloc_vanilla:
+    {
+      // FIXME: need to handle 64 bit vanilla relocs
+      MachORelocation VANILLA(MR.getMachineCodeOffset(), ToIdx,
+                              false, 2, isExtern,
+                              PPC_RELOC_VANILLA,
+                              Scattered, (intptr_t)MR.getResultPointer());
+      ++NumRelocs;
+
+      if (Scattered) {
+        RelocOut.outword(VANILLA.getPackedFields());
+        RelocOut.outword(VANILLA.getAddress());
+      } else {
+        RelocOut.outword(VANILLA.getAddress());
+        RelocOut.outword(VANILLA.getPackedFields());
+      }
+      
+      intptr_t SymbolOffset;
+
+      if (Scattered)
+        SymbolOffset = Addr + MR.getConstantVal();
+      else
+        SymbolOffset = Addr;
+
+      printf("vanilla fixup: sec_%x[%x] = %x\n", FromIdx,
+             unsigned(MR.getMachineCodeOffset()),
+             unsigned(SymbolOffset));
+      SecOut.fixword(SymbolOffset, MR.getMachineCodeOffset());
+    }
+    break;
+  case PPC::reloc_pcrel_bx:
+    {
+      // FIXME: Presumably someday we will need to branch to other, non-extern
+      // functions too.  Need to figure out some way to distinguish between
+      // target is BB and target is function.
+      if (isExtern) {
+        MachORelocation BR24(MR.getMachineCodeOffset(), ToIdx, true, 2, 
+                             isExtern, PPC_RELOC_BR24, Scattered, 
+                             (intptr_t)MR.getMachineCodeOffset());
+        RelocOut.outword(BR24.getAddress());
+        RelocOut.outword(BR24.getPackedFields());
+        ++NumRelocs;
+      }
+
+      Addr -= MR.getMachineCodeOffset();
+      Addr >>= 2;
+      Addr &= 0xFFFFFF;
+      Addr <<= 2;
+      Addr |= (SecOut[MR.getMachineCodeOffset()] << 24);
+      Addr |= (SecOut[MR.getMachineCodeOffset()+3] & 0x3);
+      SecOut.fixword(Addr, MR.getMachineCodeOffset());
+      break;
+    }
+  case PPC::reloc_pcrel_bcx:
+    {
+      Addr -= MR.getMachineCodeOffset();
+      Addr &= 0xFFFC;
+
+      SecOut.fixhalf(Addr, MR.getMachineCodeOffset() + 2);
+      break;
+    }
+  case PPC::reloc_absolute_high:
+    {
+      MachORelocation HA16(MR.getMachineCodeOffset(), ToIdx, false, 2,
+                           isExtern, PPC_RELOC_HA16);
+      MachORelocation PAIR(Addr & 0xFFFF, 0xFFFFFF, false, 2, isExtern,
+                           PPC_RELOC_PAIR);
+      NumRelocs = 2;
+
+      RelocOut.outword(HA16.getRawAddress());
+      RelocOut.outword(HA16.getPackedFields());
+      RelocOut.outword(PAIR.getRawAddress());
+      RelocOut.outword(PAIR.getPackedFields());
+
+      Addr += 0x8000;
+
+      SecOut.fixhalf(Addr >> 16, MR.getMachineCodeOffset() + 2);
+      break;
+    }
+  case PPC::reloc_absolute_low:
+    {
+      MachORelocation LO16(MR.getMachineCodeOffset(), ToIdx, false, 2,
+                           isExtern, PPC_RELOC_LO16);
+      MachORelocation PAIR(Addr >> 16, 0xFFFFFF, false, 2, isExtern,
+                           PPC_RELOC_PAIR);
+      NumRelocs = 2;
+
+      RelocOut.outword(LO16.getRawAddress());
+      RelocOut.outword(LO16.getPackedFields());
+      RelocOut.outword(PAIR.getRawAddress());
+      RelocOut.outword(PAIR.getPackedFields());
+
+      SecOut.fixhalf(Addr, MR.getMachineCodeOffset() + 2);
+      break;
+    }
+  }
+
+  return NumRelocs;
+}