[SOL] Add R_BPF_64_ABS64 relocation handling in lld

lld/ELF/Arch/BPF.cpp

@@ -47,6 +47,8 @@ RelExpr BPF::getRelExpr(RelType type, const Symbol &s,
       return R_PC;
     case R_BPF_64_64:
       return R_ABS;
+    case R_BPF_64_ABS64:
+      return R_ADDEND;
     default:
       error(getErrorLocation(loc) + "unrecognized reloc " + toString(type));
   }
@@ -76,6 +78,14 @@ 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: {
+      // The relocation type is used for normal 64-bit data. The
+      // actual to-be-relocated data is stored at r_offset and the
+      // read/write data bitsize is 64 (8 bytes). The relocation can
+      // be resolved with the symbol value plus implicit addend.
+      write64le(loc, val);
+      break;
+    }
     default:
       error(getErrorLocation(loc) + "unrecognized reloc " + toString(rel.type));
   }