[SOL] support debug-relevant relocs

Author: Richard Patel

lld/ELF/Arch/BPF.cpp

@@ -45,7 +45,10 @@ RelExpr BPF::getRelExpr(RelType type, const Symbol &s,
   switch (type) {
     case R_BPF_64_32:
       return R_PC;
+    case R_BPF_64_ABS32:
+    case R_BPF_64_NODYLD32:
     case R_BPF_64_64:
+    case R_BPF_64_ABS64:
       return R_ABS;
     default:
       error(getErrorLocation(loc) + "unrecognized reloc " + toString(type));
@@ -68,6 +71,12 @@ void BPF::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
       write32le(loc + 4, ((val - 8) / 8) & 0xFFFFFFFF);
       break;
     }
+    case R_BPF_64_ABS32:
+    case R_BPF_64_NODYLD32: {
+      // Relocation used by .BTF.ext and DWARF
+      write32le(loc, val & 0xFFFFFFFF);
+      break;
+    }
     case R_BPF_64_64: {
       // Relocation of a lddw instruction
       // 64 bit address is divided into the imm of this and the following
@@ -76,6 +85,11 @@ void BPF::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
       write32le(loc + 8 + 4, val >> 32);
       break;
     }
+    case R_BPF_64_ABS64: {
+      // Relocation used by DWARF
+      write64le(loc, val);
+      break;
+    }
     default:
       error(getErrorLocation(loc) + "unrecognized reloc " + toString(rel.type));
   }

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

@@ -64,7 +64,7 @@ unsigned BPFELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
     // CALL instruction.
     return ELF::R_BPF_64_32;
   case FK_Data_8:
-    return isSolana ? ELF::R_BPF_64_64 : ELF::R_BPF_64_ABS64;
+    return ELF::R_BPF_64_ABS64;
   case FK_Data_4:
     if (const MCSymbolRefExpr *A = Target.getSymA()) {
       const MCSymbol &Sym = A->getSymbol();
@@ -94,7 +94,7 @@ unsigned BPFELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
         }
       }
     }
-    return isSolana ? ELF::R_BPF_64_32 : ELF::R_BPF_64_ABS32;
+    return ELF::R_BPF_64_ABS32;
   }
 }