diff --git a/build.py b/build.py
index fed0ef8..6bb99eb 100755
--- a/build.py
+++ b/build.py
@@ -168,12 +168,12 @@ try:
             reqs_satisfied = True
             # Check API dependencies
             for req in api['reqs']:
-                if not (req in tinyrt_apis):
-                    reqs_satisfied = False
-                    break
-                if not (req in mod_exports):
-                    reqs_satisfied = False
-                    break
+                if req in tinyrt_apis:
+                    continue
+                elif req in mod_exports:
+                    continue
+                reqs_satisfied = False
+                break
             if not reqs_satisfied:
                 print(f"  -> Not exporting API '{api_name}'")
             else:
diff --git a/include/cia-mem.h b/include/cia-mem.h
index 9700267..6fa065a 100644
--- a/include/cia-mem.h
+++ b/include/cia-mem.h
@@ -4,19 +4,26 @@
 void *cia_ptr_alignf(void *ptr, u64 alignment);
 void *cia_ptr_alignb(void *ptr, u64 alignment);
 
+#define CIA_MEM_OP_ALLOC     1
+#define CIA_MEM_OP_FREE      2
+#define CIA_MEM_OP_FREE_ALL  3
+#define CIA_MEM_OP_RESIZE    4
+
 struct Cia_Allocator typedef Cia_Allocator;
 struct Cia_Allocator {
     void *ctx;
-    void *(*alloc)(void *ctx, u64 size);
-    void *(*alloc_a)(void *ctx, u64 size, u64 alignment);
-    void (*free)(void *ctx, void *ptr);
-    void (*free_all)(void *ctx, void *ptr);
-    void *(*realloc)(void *ctx, void *ptr, u64 new_size);
+    void *(*proc)(void *ctx, int optype, void *old_ptr, u64 old_size, u64 size, u64 alignment);
 };
 
 Cia_Allocator cia_allocator_null();
 Cia_Allocator cia_allocator_pages();
 
+void *allocator_alloc(Cia_Allocator *alloc, u64 size, u64 alignment);
+void allocator_free_size(Cia_Allocator *alloc, void *region_ptr, u64 region_size);
+void allocator_free(Cia_Allocator *alloc, void *region_ptr);
+void allocator_free_all(Cia_Allocator *alloc);
+void *allocator_resize(Cia_Allocator *alloc, void *old_ptr, u64 old_size, u64 new_size);
+
 struct Cia_Arena typedef Cia_Arena;
 struct Cia_Arena {
     Cia_Allocator allocator;
diff --git a/src/impl/cia-mem/allocator.c b/src/impl/cia-mem/allocator.c
index 12ad51e..8ecc03b 100644
--- a/src/impl/cia-mem/allocator.c
+++ b/src/impl/cia-mem/allocator.c
@@ -1,37 +1,68 @@
 
+static void *null_allocator_proc(void *ctx, int optype, void *old_ptr, u64 old_size, u64 size, u64 alignment) {
+    return NULL;
+}
+
 Cia_Allocator cia_allocator_null() {
     Cia_Allocator allocator = {
         .ctx = NULL,
-        .alloc = NULL,
-        .alloc_a = NULL,
-        .free = NULL,
-        .free_all = NULL,
-        .realloc = NULL
+        .proc = null_allocator_proc,
     };
     return allocator;
 }
 
-static void *page_alloc(void *ctx, u64 size) {
-    void *addr;
-    _RT_Status status = _rt_mem_alloc(NULL, size, &addr);
-    if(status != _RT_STATUS_OK) {
-        return NULL;
+static void *page_allocator_proc(void *ctx, int optype, void *old_ptr, u64 old_size, u64 size, u64 alignment) {
+    switch(optype) {
+        case CIA_MEM_OP_ALLOC: {
+            void *addr;
+            if(alignment > 0x1000) {
+                return NULL;
+            }
+            _RT_Status status = _rt_mem_alloc(NULL, size, &addr);
+            if(status != _RT_STATUS_OK) {
+                return NULL;
+            }
+            return addr;
+        } break;
+        case CIA_MEM_OP_FREE: {
+            _rt_mem_free(old_ptr);
+        } break;
+        case CIA_MEM_OP_FREE_ALL: {
+            return NULL;
+        } break;
+        case CIA_MEM_OP_RESIZE: {
+            return NULL;
+        } break;
     }
-    return addr;
-}
-
-static void page_free(void *ptr) {
-    _rt_mem_free(ptr);
+    return NULL;
 }
 
 Cia_Allocator cia_allocator_pages() {
     Cia_Allocator allocator = {
         .ctx = NULL,
-        .alloc = page_alloc,
-        .alloc_a = NULL,
-        .free = page_free,
-        .free_all = NULL,
-        .realloc = NULL,
+        .proc = page_allocator_proc,
     };
     return allocator;
 }
+
+void *allocator_alloc(Cia_Allocator *alloc, u64 size, u64 alignment) {
+    return alloc->proc(alloc->ctx, CIA_MEM_OP_ALLOC, NULL, 0, size, alignment);    
+}
+
+void allocator_free_size(Cia_Allocator *alloc, void *region_ptr, u64 region_size) {
+    alloc->proc(alloc->ctx, CIA_MEM_OP_FREE, region_ptr, region_size, 0, 1);
+}
+
+void allocator_free(Cia_Allocator *alloc, void *region_ptr) {
+    alloc->proc(alloc->ctx, CIA_MEM_OP_FREE, region_ptr, 0, 0, 1);
+}
+
+void allocator_free_all(Cia_Allocator *alloc) {
+    alloc->proc(alloc->ctx, CIA_MEM_OP_FREE_ALL, NULL, 0, 0, 1);
+}
+
+void *allocator_resize(Cia_Allocator *alloc, void *old_ptr, u64 old_size, u64 new_size, u64 alignment) {
+    return alloc->proc(alloc->ctx, CIA_MEM_OP_RESIZE, old_ptr, old_size, new_size, alignment);
+}
+
+
diff --git a/src/impl/cia-mem/arena.c b/src/impl/cia-mem/arena.c
index 45d2e24..ff59217 100644
--- a/src/impl/cia-mem/arena.c
+++ b/src/impl/cia-mem/arena.c
@@ -3,7 +3,7 @@ void cia_arena_create(Cia_Arena *arena, Cia_Allocator backing_allocator, u64 buf
     arena->allocator = backing_allocator;
     arena->buffer_size = buffer_size;
     arena->used = 0;
-    arena->buffer = arena->allocator.alloc(arena->allocator.ctx, buffer_size);
+    arena->buffer = allocator_alloc(&arena->allocator, arena->buffer_size, 16);
 }
 
 void *cia_arena_alloc(Cia_Arena *arena, u64 size) {
@@ -31,5 +31,5 @@ void cia_arena_free_all(Cia_Arena *arena) {
 }
 
 void cia_arena_destroy(Cia_Arena *arena) {
-    arena->allocator.free(arena->allocator.ctx, arena->buffer);
+    allocator_free_size(&arena->allocator, arena->buffer, arena->buffer_size);
 }