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diff --git a/py/asmbase.h b/py/asmbase.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_PY_ASMBASE_H
+#define MICROPY_INCLUDED_PY_ASMBASE_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define MP_ASM_PASS_COMPUTE (1)
+#define MP_ASM_PASS_EMIT    (2)
+
+typedef struct _mp_asm_base_t {
+    int pass;
+    size_t code_offset;
+    size_t code_size;
+    uint8_t *code_base;
+
+    size_t max_num_labels;
+    size_t *label_offsets;
+} mp_asm_base_t;
+
+void mp_asm_base_init(mp_asm_base_t *as, size_t max_num_labels);
+void mp_asm_base_deinit(mp_asm_base_t *as, bool free_code);
+void mp_asm_base_start_pass(mp_asm_base_t *as, int pass);
+uint8_t *mp_asm_base_get_cur_to_write_bytes(mp_asm_base_t *as, size_t num_bytes_to_write);
+void mp_asm_base_label_assign(mp_asm_base_t *as, size_t label);
+void mp_asm_base_align(mp_asm_base_t* as, unsigned int align);
+void mp_asm_base_data(mp_asm_base_t* as, unsigned int bytesize, uintptr_t val);
+
+static inline size_t mp_asm_base_get_code_pos(mp_asm_base_t *as) {
+    return as->code_offset;
+}
+
+static inline size_t mp_asm_base_get_code_size(mp_asm_base_t *as) {
+    return as->code_size;
+}
+
+static inline void *mp_asm_base_get_code(mp_asm_base_t *as) {
+    #if defined(MP_PLAT_COMMIT_EXEC)
+    return MP_PLAT_COMMIT_EXEC(as->code_base, as->code_size);
+    #else
+    return as->code_base;
+    #endif
+}
+
+#endif // MICROPY_INCLUDED_PY_ASMBASE_H