Sketch out PowerPC ELF writer. This is enough to get clang -integrated-as

to compile a working hello world on FreeBSD/PPC32.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136689 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 70 insertions, 0 deletions

diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index d562ac09b1..050d11ef3f 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -30,6 +30,7 @@
 
 #include "../Target/X86/MCTargetDesc/X86FixupKinds.h"
 #include "../Target/ARM/MCTargetDesc/ARMFixupKinds.h"
+#include "../Target/PowerPC/MCTargetDesc/PPCFixupKinds.h"
 
 #include <vector>
 using namespace llvm;
@@ -446,6 +447,14 @@ void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
 
   uint64_t RelocOffset = Layout.getFragmentOffset(Fragment) +
     Fixup.getOffset();
+  switch ((unsigned)Fixup.getKind()) {
+    case PPC::fixup_ppc_ha16:
+    case PPC::fixup_ppc_lo16:
+      RelocOffset += 2;
+      break;
+    default:
+      break;
+  }
 
   if (!hasRelocationAddend())
     Addend = 0;
@@ -1252,6 +1261,9 @@ MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
       return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     case ELF::EM_MBLAZE:
       return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break;
+    case ELF::EM_PPC:
+    case ELF::EM_PPC64:
+      return new PPCELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     default: llvm_unreachable("Unsupported architecture"); break;
   }
 }
@@ -1503,6 +1515,64 @@ unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target,
   return Type;
 }
 
+//===- PPCELFObjectWriter -------------------------------------------===//
+
+PPCELFObjectWriter::PPCELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+                                             raw_ostream &_OS,
+                                             bool IsLittleEndian)
+  : ELFObjectWriter(MOTW, _OS, IsLittleEndian) {
+}
+
+PPCELFObjectWriter::~PPCELFObjectWriter() {
+}
+
+unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
+                                             const MCFixup &Fixup,
+                                             bool IsPCRel,
+                                             bool IsRelocWithSymbol,
+                                             int64_t Addend) {
+  // determine the type of the relocation
+  unsigned Type;
+  if (IsPCRel) {
+    switch ((unsigned)Fixup.getKind()) {
+    default:
+      llvm_unreachable("Unimplemented");
+    case PPC::fixup_ppc_br24:
+      Type = ELF::R_PPC_REL24;
+      break;
+    case FK_PCRel_4:
+      Type = ELF::R_PPC_REL32;
+      break;
+    }
+  } else {
+    switch ((unsigned)Fixup.getKind()) {
+      default: llvm_unreachable("invalid fixup kind!");
+    case PPC::fixup_ppc_br24:
+      Type = ELF::R_PPC_ADDR24;
+      break;
+    case PPC::fixup_ppc_brcond14:
+      Type = ELF::R_PPC_ADDR14_BRTAKEN; // XXX: or BRNTAKEN?_
+      break;
+    case PPC::fixup_ppc_ha16:
+      Type = ELF::R_PPC_ADDR16_HA;
+      break;
+    case PPC::fixup_ppc_lo16:
+      Type = ELF::R_PPC_ADDR16_LO;
+      break;
+    case PPC::fixup_ppc_lo14:
+      Type = ELF::R_PPC_ADDR14;
+      break;
+    case FK_Data_4:
+      Type = ELF::R_PPC_ADDR32;
+      break;
+    case FK_Data_2:
+      Type = ELF::R_PPC_ADDR16;
+      break;
+    }
+  }
+  return Type;
+}
+
 //===- MBlazeELFObjectWriter -------------------------------------------===//
 
 MBlazeELFObjectWriter::MBlazeELFObjectWriter(MCELFObjectTargetWriter *MOTW,