diff --git a/src/mapleall/maple_be/src/cg/emit.cpp b/src/mapleall/maple_be/src/cg/emit.cpp
index cb5fb979431fe61d76c3a2f985e745971043ba61..a5cee7346d887eaa3e558f209bcd74e3634119ec 100644
--- a/src/mapleall/maple_be/src/cg/emit.cpp
+++ b/src/mapleall/maple_be/src/cg/emit.cpp
@@ -3208,11 +3208,6 @@ void Emitter::EmitDIAttrValue(DBGDie *die, DBGDieAttr *attr, DwAt attrName, DwTa
     case DW_FORM_exprloc: {
       DBGExprLoc *elp = attr->GetPtr();
       switch (elp->GetOp()) {
-        case DW_OP_reg29:
-          EmitHexUnsigned(1);
-          Emit("\n\t.byte    ");
-          EmitHexUnsigned(elp->GetOp());
-          break;
         case DW_OP_call_frame_cfa:
           EmitHexUnsigned(1);
           Emit("\n\t.byte    ");
@@ -3488,7 +3483,7 @@ void Emitter::SetupDBGInfo(DebugInfo *mirdi) {
     switch (diae->GetTag()) {
       case DW_TAG_subprogram: {
         DBGExprLoc *exprloc = emitter->memPool->New<DBGExprLoc>(emitter->GetCG()->GetMIRModule());
-        exprloc->GetSimpLoc()->SetDwOp(DW_OP_reg29);
+        exprloc->GetSimpLoc()->SetDwOp(DW_OP_call_frame_cfa);
         die->SetAttr(DW_AT_frame_base, exprloc);
       } break;
       case DW_TAG_structure_type:
diff --git a/src/mapleall/maple_ir/src/debug_info.cpp b/src/mapleall/maple_ir/src/debug_info.cpp
index 7e4ffa173fec4b0a7b6fd842ff0ce5f651f57c62..3441f2b2e5cd8116656839077200411fcb33a6a2 100644
--- a/src/mapleall/maple_ir/src/debug_info.cpp
+++ b/src/mapleall/maple_ir/src/debug_info.cpp
@@ -97,7 +97,7 @@ DBGDieAttr *DBGDie::AddGlobalLocAttr(DwAt at, DwForm form, uint64 val) {
 }
 
 DBGDieAttr *DBGDie::AddFrmBaseAttr(DwAt at, DwForm form) {
-  DBGExprLoc *p = module->GetMemPool()->New<DBGExprLoc>(module, DW_OP_reg29);
+  DBGExprLoc *p = module->GetMemPool()->New<DBGExprLoc>(module, DW_OP_call_frame_cfa);
   DBGDieAttr *attr = module->GetDbgInfo()->CreateAttr(at, form, reinterpret_cast<uint64>(p));
   AddAttr(attr);
   return attr;
@@ -1168,7 +1168,6 @@ size_t DBGDieAttr::SizeOf(DBGDieAttr *attr) {
       CHECK_FATAL(ptr != (DBGExprLoc*)(0xdeadbeef), "wrong ptr");
       switch (ptr->GetOp()) {
         case DW_OP_call_frame_cfa:
-        case DW_OP_reg29:
           return k2BitSize;  // size 1 byte + DW_OP_call_frame_cfa 1 byte
         case DW_OP_fbreg: {
           // DW_OP_fbreg 1 byte