BPF: Replace deprecated FK_PCRel_ with FK_Data_ fixup and PCRel flag

We will unify the generic fixup kinds FK_Data_ and FK_PCRel_. A
FK_PCRel_ kind is essentially the corresponding FK_Data_ fixup with the
PCRel flag set.

Author: MaskRay

llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp

@@ -78,11 +78,11 @@ void BPFAsmBackend::applyFixup(const MCFragment &F, const MCFixup &Fixup,
     support::endian::write<uint32_t>(&Data[Fixup.getOffset() + 4],
                                      static_cast<uint32_t>(Value),
                                      Endian);
-  } else if (Fixup.getKind() == FK_Data_4) {
+  } else if (Fixup.getKind() == FK_Data_4 && !Fixup.isPCRel()) {
     support::endian::write<uint32_t>(&Data[Fixup.getOffset()], Value, Endian);
   } else if (Fixup.getKind() == FK_Data_8) {
     support::endian::write<uint64_t>(&Data[Fixup.getOffset()], Value, Endian);
-  } else if (Fixup.getKind() == FK_PCRel_4) {
+  } else if (Fixup.getKind() == FK_Data_4 && Fixup.isPCRel()) {
     Value = (uint32_t)((Value - 8) / 8);
     if (Endian == llvm::endianness::little) {
       Data[Fixup.getOffset() + 1] = 0x10;
@@ -97,7 +97,7 @@ void BPFAsmBackend::applyFixup(const MCFragment &F, const MCFixup &Fixup,
     support::endian::write<uint32_t>(&Data[Fixup.getOffset() + 4], Value,
                                      Endian);
   } else {
-    assert(Fixup.getKind() == FK_PCRel_2);
+    assert(Fixup.getKind() == FK_Data_2 && Fixup.isPCRel());
 
     int64_t ByteOff = (int64_t)Value - 8;
     if (ByteOff > INT16_MAX * 8 || ByteOff < INT16_MIN * 8)

llvm/lib/Target/BPF/MCTargetDesc/BPFELFObjectWriter.cpp

@@ -45,12 +45,11 @@ unsigned BPFELFObjectWriter::getRelocType(const MCFixup &Fixup,
   case FK_SecRel_8:
     // LD_imm64 instruction.
     return ELF::R_BPF_64_64;
-  case FK_PCRel_4:
-    // CALL instruction.
-    return ELF::R_BPF_64_32;
   case FK_Data_8:
     return ELF::R_BPF_64_ABS64;
   case FK_Data_4:
+    if (Fixup.isPCRel()) // CALL instruction
+      return ELF::R_BPF_64_32;
     if (const auto *A = Target.getAddSym()) {
       const MCSymbol &Sym = *A;
 

llvm/lib/Target/BPF/MCTargetDesc/BPFMCCodeEmitter.cpp

@@ -107,14 +107,14 @@ unsigned BPFMCCodeEmitter::getMachineOpValue(const MCInst &MI,
 
   if (MI.getOpcode() == BPF::JAL)
     // func call name
-    addFixup(Fixups, 0, Expr, FK_PCRel_4, true);
+    addFixup(Fixups, 0, Expr, FK_Data_4, true);
   else if (MI.getOpcode() == BPF::LD_imm64)
     addFixup(Fixups, 0, Expr, FK_SecRel_8);
   else if (MI.getOpcode() == BPF::JMPL)
     addFixup(Fixups, 0, Expr, BPF::FK_BPF_PCRel_4, true);
   else
     // bb label
-    addFixup(Fixups, 0, Expr, FK_PCRel_2, true);
+    addFixup(Fixups, 0, Expr, FK_Data_2, true);
 
   return 0;
 }