--- a/src/impl/vm_impl.cbc	Fri Jan 24 17:01:11 2020 +0900
+++ b/src/impl/vm_impl.cbc	Fri Jan 24 17:22:51 2020 +0900
@@ -105,7 +105,7 @@
     vm->offset = offset;
     vm->sz = sz;
     
-    goto loaduvm_ptesize_checkvm_impl(vm, next);
+    goto loaduvm_ptesize_checkvm_impl(vm, next(...));
 }
 
 __code allocuvmvm_impl(struct vm_impl* vm, pde_t* pgdir, uint oldsz, uint newsz, __code next(...)) {
@@ -115,7 +115,7 @@
 
 __code clearpteuvm_impl(struct vm_impl* vm, pde_t* pgdir, char* uva,  __code next(...)) {
 
-    goto clearpteu_check_ptevm_impl(vm, pgdir, uva, next(...);
+    goto clearpteu_check_ptevm_impl(vm, pgdir, uva, next(...));
 }
 
 __code copyuvmvm_impl(struct vm_impl* vm, pde_t* pgdir, uint sz, __code next(...)) {

--- a/src/impl/vm_impl.h	Fri Jan 24 17:01:11 2020 +0900
+++ b/src/impl/vm_impl.h	Fri Jan 24 17:22:51 2020 +0900
@@ -19,8 +19,8 @@
     uint ap;
 
     __code kpt_alloc_check_impl(Type* vm_impl, __code next(...));
-    __code loaduvm_ptesize_check(Type* vm_impl, __code next(...));
-    __code loaduvm_loop(Type* vm_impl, uint i, pte_t* pte, uint sz, __code next(...));
+    __code loaduvm_ptesize_check(Type* vm_impl, __code next(int ret, ...));
+    __code loaduvm_loop(Type* vm_impl, uint i, pte_t* pte, uint sz, __code next(int ret, ...));
     __code allocuvm_check_newsz(Type* vm_impl, pde_t* pgdir, uint oldsz, uint newsz, __code next(...));
     __code allocuvm_loop(Type* vm_impl, pde_t* pgdir, uint oldsz, uint newsz, uint a, __code next(...));
     __code copyuvm_check_null(Type* vm_impl, pde_t* pgdir, uint sz, __code next(...));

--- a/src/impl/vm_impl_private.cbc	Fri Jan 24 17:01:11 2020 +0900
+++ b/src/impl/vm_impl_private.cbc	Fri Jan 24 17:22:51 2020 +0900
@@ -7,25 +7,25 @@
 vm_impl* createvm_impl2();
 */
 
-__code loaduvm_ptesize_checkvm_impl(struct vm_impl* vm_impl, __code next(...)) {
+__code loaduvm_ptesize_checkvm_impl(struct vm_impl* vm_impl, __code next(int ret, ...)) {
     char* addr = vm_impl->addr;
 
     if ((uint) addr %PTE_SZ != 0) {
        // goto panic 
     }
 
-    goto loaduvm_loopvm_impl(vm_impl, next(...));
+    goto loaduvm_loopvm_impl(vm_impl, next(ret, ...));
 }
 
-__code loaduvm_loopvm_impl(struct vm_impl* vm_impl, __code next(...)) {
+__code loaduvm_loopvm_impl(struct vm_impl* vm_impl, __code next(int ret, ...)) {
     uint i = vm_impl->i;
     uint sz = vm_impl->sz;
 
     if (i < sz) {
-        goto loaduvm_check_pgdir(vm_impl, next(...));  
+        goto loaduvm_check_pgdir(vm_impl, next(ret, ...));  
     } 
 
-    goto loaduvm_exit(vm_impl, next(...));
+    goto loaduvm_exit(vm_impl, next(ret, ...));
 }
 
 
@@ -58,7 +58,7 @@
 }
 
 
-__code loaduvm_check_pgdir(struct vm_impl* vm_impl, __code next(...)) {
+__code loaduvm_check_pgdir(struct vm_impl* vm_impl, __code next(int ret, ...)) {
     pte_t* pte = vm_impl->pte;
     pde_t* pgdir = vm_impl->pgdir;
     uint i = vm_impl->i;
@@ -75,10 +75,10 @@
     vm_impl->addr = addr; 
     vm_impl->pa = pa; 
 
-    goto loaduvm_check_PTE_SZ(vm_impl, next(...));
+    goto loaduvm_check_PTE_SZ(vm_impl, next(ret, ...));
 }
 
-__code loaduvm_check_PTE_SZ(struct vm_impl* vm_impl, __code next(...)) {
+__code loaduvm_check_PTE_SZ(struct vm_impl* vm_impl, __code next(int ret, ...)) {
     uint sz = vm_impl->sz;
     uint i = vm_impl->i;
     uint n = vm_impl->n;
@@ -93,18 +93,18 @@
     }
 
     if (readi(ip, p2v(pa), offset + i, n) != n) {
-        // panic 
-        // return -1;
+        ret = -1;
+        goto next(ret, ...);
     }
 
     vm_impl->n = n;
  
-    goto loaduvm_exit(vm_impl, next(...));
+    goto loaduvm_loopvm_impl(vm_impl, next(ret, ...));
 }
 
-__code loaduvm_exit(struct vm_impl* vm_impl, __code next(...)) {
-
-    goto next(...);
+__code loaduvm_exit(struct vm_impl* vm_impl, __code next(int ret, ...)) {
+    ret = 0;
+    goto next(ret, ...);
 }
 
 struct run {