ELF symbol table field st_other support,

excluding visibility bits.

Mips (MicroMips) specific STO handling .

The st_other field settig for STO_MIPS_MICROMIPS

Contributer: Zoran Jovanovic
llvm-svn: 175564

include/llvm/Support/ELF.h

@@ -738,6 +738,10 @@ enum {
   EF_MIPS_NOREORDER = 0x00000001, // Don't reorder instructions
   EF_MIPS_PIC       = 0x00000002, // Position independent code
   EF_MIPS_CPIC      = 0x00000004, // Call object with Position independent code
+  //ARCH_ASE
+  EF_MIPS_MICROMIPS = 0x02000000, // microMIPS
+  //ARCH
+  EF_MIPS_ARCH      = 0xf0000000, // Mask for applying EF_MIPS_ARCH_ variant
   EF_MIPS_ARCH_1    = 0x00000000, // MIPS1 instruction set
   EF_MIPS_ARCH_2    = 0x10000000, // MIPS2 instruction set
   EF_MIPS_ARCH_3    = 0x20000000, // MIPS3 instruction set
@@ -746,9 +750,7 @@ enum {
   EF_MIPS_ARCH_32   = 0x50000000, // MIPS32 instruction set per linux not elf.h
   EF_MIPS_ARCH_64   = 0x60000000, // MIPS64 instruction set per linux not elf.h
   EF_MIPS_ARCH_32R2 = 0x70000000, // mips32r2
-  EF_MIPS_ARCH_64R2 = 0x80000000, // mips64r2
-  EF_MIPS_ARCH      = 0xf0000000, // Mask for applying EF_MIPS_ARCH_ variant
-  EF_MIPS_MICROMIPS = 0x02000000  // microMIPS
+  EF_MIPS_ARCH_64R2 = 0x80000000  // mips64r2
 };
 
 // ELF Relocation types for Mips
@@ -809,6 +811,11 @@ enum {
   R_MIPS_NUM               = 218
 };
 
+// Special values for the st_other field in the symbol table entry for MIPS.
+enum {
+  STO_MIPS_MICROMIPS       = 0x80 // MIPS Specific ISA for MicroMips
+};
+
 // Hexagon Specific e_flags
 // Release 5 ABI
 enum {

lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp

@@ -9,6 +9,9 @@
 #include "MCTargetDesc/MipsELFStreamer.h"
 #include "MipsSubtarget.h"
 #include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCELF.h"
+#include "llvm/MC/MCELFSymbolFlags.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/ErrorHandling.h"
 
@@ -58,7 +61,22 @@ namespace llvm {
       llvm_unreachable("Unsupported relocation model for e_flags");
 
     MCA.setELFHeaderEFlags(EFlags);
-
-
   }
-}
+
+  // For llc. Set a symbol's STO flags
+  void
+  MipsELFStreamer::emitMipsSTOCG(const MipsSubtarget &Subtarget,
+                                 MCSymbol *Sym,
+                                 unsigned Val) {
+
+    if (hasRawTextSupport())
+      return;
+
+    MCSymbolData &Data = getOrCreateSymbolData(Sym);
+    // The "other" values are stored in the last 6 bits of the second byte
+    // The traditional defines for STO values assume the full byte and thus
+    // the shift to pack it.
+    MCELF::setOther(Data, Val >> 2);
+  }
+
+} // namespace llvm

lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h

@@ -12,7 +12,9 @@
 #include "llvm/MC/MCELFStreamer.h"
 
 namespace llvm {
+class MipsAsmPrinter;
 class MipsSubtarget;
+class MCSymbol;
 
 class MipsELFStreamer : public MCELFStreamer {
 public:
@@ -24,7 +26,9 @@ public:
 
   ~MipsELFStreamer() {}
   void emitELFHeaderFlagsCG(const MipsSubtarget &Subtarget);
-//  void emitELFHeaderFlagCG(unsigned Val);
+  void emitMipsSTOCG(const MipsSubtarget &Subtarget,
+                     MCSymbol *Sym,
+                     unsigned Val);
 
   static bool classof(const MCStreamer *S) {
     return S->getKind() == SK_MipsELFStreamer;

lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp

@@ -35,11 +35,13 @@ class MipsMCCodeEmitter : public MCCodeEmitter {
   void operator=(const MipsMCCodeEmitter &) LLVM_DELETED_FUNCTION;
   const MCInstrInfo &MCII;
   MCContext &Ctx;
+  const MCSubtargetInfo &STI;
   bool IsLittleEndian;
 
 public:
-  MipsMCCodeEmitter(const MCInstrInfo &mcii, MCContext &Ctx_, bool IsLittle) :
-    MCII(mcii), Ctx(Ctx_), IsLittleEndian(IsLittle) {}
+  MipsMCCodeEmitter(const MCInstrInfo &mcii, MCContext &Ctx_,
+                    const MCSubtargetInfo &sti, bool IsLittle) :
+    MCII(mcii), Ctx(Ctx_), STI (sti), IsLittleEndian(IsLittle) {}
 
   ~MipsMCCodeEmitter() {}
 
@@ -95,7 +97,7 @@ MCCodeEmitter *llvm::createMipsMCCodeEmitterEB(const MCInstrInfo &MCII,
                                                const MCSubtargetInfo &STI,
                                                MCContext &Ctx)
 {
-  return new MipsMCCodeEmitter(MCII, Ctx, false);
+  return new MipsMCCodeEmitter(MCII, Ctx, STI, false);
 }
 
 MCCodeEmitter *llvm::createMipsMCCodeEmitterEL(const MCInstrInfo &MCII,
@@ -103,7 +105,7 @@ MCCodeEmitter *llvm::createMipsMCCodeEmitterEL(const MCInstrInfo &MCII,
                                                const MCSubtargetInfo &STI,
                                                MCContext &Ctx)
 {
-  return new MipsMCCodeEmitter(MCII, Ctx, true);
+  return new MipsMCCodeEmitter(MCII, Ctx, STI, true);
 }
 
 /// EncodeInstruction - Emit the instruction.

lib/Target/Mips/MipsAsmPrinter.cpp

@@ -36,6 +36,7 @@
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ELF.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/Mangler.h"
@@ -231,6 +232,11 @@ void MipsAsmPrinter::EmitFunctionEntryLabel() {
     // OutStreamer.EmitRawText(StringRef("\t.set\tnomicromips"));
     OutStreamer.EmitRawText("\t.ent\t" + Twine(CurrentFnSym->getName()));
   }
+
+  if (Subtarget->inMicroMipsMode())
+    if (MipsELFStreamer *MES = dyn_cast<MipsELFStreamer>(&OutStreamer))
+      MES->emitMipsSTOCG(*Subtarget, CurrentFnSym,
+      (unsigned)ELF::STO_MIPS_MICROMIPS);
   OutStreamer.EmitLabel(CurrentFnSym);
 }