diff --git a/core/iwasm/lib/native/libc/libc_wrapper.c b/core/iwasm/lib/native/libc/libc_wrapper.c
index 6d3ac0c9f..cf31a2b97 100644
--- a/core/iwasm/lib/native/libc/libc_wrapper.c
+++ b/core/iwasm/lib/native/libc/libc_wrapper.c
@@ -414,7 +414,7 @@ sprintf_out(int c, struct str_context *ctx)
 static int
 printf_out(int c, struct str_context *ctx)
 {
-    printf("%c", c);
+    bh_printf("%c", c);
     ctx->count++;
     return c;
 }
@@ -542,13 +542,13 @@ _puts_wrapper(int32 str_offset)
         return 0;
 
     str = addr_app_to_native(str_offset);
-    return printf("%s\n", str);
+    return bh_printf("%s\n", str);
 }
 
 static int
 _putchar_wrapper(int c)
 {
-    printf("%c", c);
+    bh_printf("%c", c);
     return 1;
 }
 
@@ -699,7 +699,10 @@ _strcpy_wrapper(int32 dst_offset, int32 src_offset)
 
     dst = addr_app_to_native(dst_offset);
     src = addr_app_to_native(src_offset);
-    strcpy(dst, src);
+    while (*src != '\0')
+        *dst++ = *src++;
+    *dst = '\0';
+
     return dst_offset;
 }
 
@@ -842,7 +845,7 @@ static void
 _llvm_stackrestore_wrapper(uint32 llvm_stack)
 {
     wasm_module_inst_t module_inst = get_module_inst();
-    printf("_llvm_stackrestore called!\n");
+    bh_printf("_llvm_stackrestore called!\n");
     wasm_runtime_set_llvm_stack(module_inst, llvm_stack);
 }
 
@@ -850,7 +853,7 @@ static uint32
 _llvm_stacksave_wrapper()
 {
     wasm_module_inst_t module_inst = get_module_inst();
-    printf("_llvm_stacksave called!\n");
+    bh_printf("_llvm_stacksave called!\n");
     return wasm_runtime_get_llvm_stack(module_inst);
 }
 
@@ -905,13 +908,13 @@ nullFunc_X_wrapper(int32 code)
 static void
 print_i32_wrapper(int i32)
 {
-    printf("%d\n", i32);
+    bh_printf("%d\n", i32);
 }
 
 static void
 print_wrapper(int i32)
 {
-    printf("%d\n", i32);
+    bh_printf("%d\n", i32);
 }
 #endif
 
diff --git a/core/iwasm/lib/native/libc/libc_wrapper_sgx.c b/core/iwasm/lib/native/libc/libc_wrapper_sgx.c
deleted file mode 100644
index 0b2a21bbf..000000000
--- a/core/iwasm/lib/native/libc/libc_wrapper_sgx.c
+++ /dev/null
@@ -1,1026 +0,0 @@
-/*
- * Copyright (C) 2019 Intel Corporation.  All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "wasm_native.h"
-#include "wasm_export.h"
-#include "wasm_log.h"
-#include "wasm_platform_log.h"
-
-void
-wasm_runtime_set_exception(wasm_module_inst_t module, const char *exception);
-
-uint32
-wasm_runtime_get_temp_ret(wasm_module_inst_t module);
-
-void
-wasm_runtime_set_temp_ret(wasm_module_inst_t module, uint32 temp_ret);
-
-uint32
-wasm_runtime_get_llvm_stack(wasm_module_inst_t module);
-
-void
-wasm_runtime_set_llvm_stack(wasm_module_inst_t module, uint32 llvm_stack);
-
-#define get_module_inst() \
-    wasm_runtime_get_current_module_inst()
-
-#define validate_app_addr(offset, size) \
-    wasm_runtime_validate_app_addr(module_inst, offset, size)
-
-#define addr_app_to_native(offset) \
-    wasm_runtime_addr_app_to_native(module_inst, offset)
-
-#define addr_native_to_app(ptr) \
-    wasm_runtime_addr_native_to_app(module_inst, ptr)
-
-#define module_malloc(size) \
-    wasm_runtime_module_malloc(module_inst, size)
-
-#define module_free(offset) \
-    wasm_runtime_module_free(module_inst, offset)
-
-typedef int (*out_func_t)(int c, void *ctx);
-
-enum pad_type {
-    PAD_NONE,
-    PAD_ZERO_BEFORE,
-    PAD_SPACE_BEFORE,
-    PAD_SPACE_AFTER,
-};
-
-typedef char *_va_list;
-#define _INTSIZEOF(n)       \
-    ((sizeof(n) +  3) & ~3)
-#define _va_arg(ap,t)       \
-    (*(t*)((ap += _INTSIZEOF(t)) - _INTSIZEOF(t)))
-
-#if OPS_INPUT_OUTPUT
-/**
- * @brief Output an unsigned int in hex format
- *
- * Output an unsigned int on output installed by platform at init time. Should
- * be able to handle an unsigned int of any size, 32 or 64 bit.
- * @param num Number to output
- *
- * @return N/A
- */
-static void
-_printf_hex_uint(out_func_t out, void *ctx,
-                 const uint64 num, bool is_u64,
-                 enum pad_type padding,
-                 int min_width)
-{
-    int size = sizeof(num) * (is_u64 ? 2 : 1);
-    int found_largest_digit = 0;
-    int remaining = 8; /* 8 digits max */
-    int digits = 0;
-
-    for (; size; size--) {
-        char nibble = (num >> ((size - 1) << 2) & 0xf);
-
-        if (nibble || found_largest_digit || size == 1) {
-            found_largest_digit = 1;
-            nibble += nibble > 9 ? 87 : 48;
-            out((int) nibble, ctx);
-            digits++;
-            continue;
-        }
-
-        if (remaining-- <= min_width) {
-            if (padding == PAD_ZERO_BEFORE) {
-                out('0', ctx);
-            } else if (padding == PAD_SPACE_BEFORE) {
-                out(' ', ctx);
-            }
-        }
-    }
-
-    if (padding == PAD_SPACE_AFTER) {
-        remaining = min_width * 2 - digits;
-        while (remaining-- > 0) {
-            out(' ', ctx);
-        }
-    }
-}
-
-/**
- * @brief Output an unsigned int in decimal format
- *
- * Output an unsigned int on output installed by platform at init time. Only
- * works with 32-bit values.
- * @param num Number to output
- *
- * @return N/A
- */
-static void
-_printf_dec_uint(out_func_t out, void *ctx,
-                 const uint32 num,
-                 enum pad_type padding,
-                 int min_width)
-{
-    uint32 pos = 999999999;
-    uint32 remainder = num;
-    int found_largest_digit = 0;
-    int remaining = 10; /* 10 digits max */
-    int digits = 1;
-
-    /* make sure we don't skip if value is zero */
-    if (min_width <= 0) {
-        min_width = 1;
-    }
-
-    while (pos >= 9) {
-        if (found_largest_digit || remainder > pos) {
-            found_largest_digit = 1;
-            out((int) ((remainder / (pos + 1)) + 48), ctx);
-            digits++;
-        } else if (remaining <= min_width && padding < PAD_SPACE_AFTER) {
-            out((int) (padding == PAD_ZERO_BEFORE ? '0' : ' '), ctx);
-            digits++;
-        }
-        remaining--;
-        remainder %= (pos + 1);
-        pos /= 10;
-    }
-    out((int) (remainder + 48), ctx);
-
-    if (padding == PAD_SPACE_AFTER) {
-        remaining = min_width - digits;
-        while (remaining-- > 0) {
-            out(' ', ctx);
-        }
-    }
-}
-
-static void
-print_err(out_func_t out, void *ctx)
-{
-    out('E', ctx);
-    out('R', ctx);
-    out('R', ctx);
-}
-
-static void
-_vprintf(out_func_t out, void *ctx, const char *fmt, _va_list ap,
-         wasm_module_inst_t module_inst)
-{
-    int might_format = 0; /* 1 if encountered a '%' */
-    enum pad_type padding = PAD_NONE;
-    int min_width = -1;
-    int long_ctr = 0;
-
-    /* fmt has already been adjusted if needed */
-
-    while (*fmt) {
-        if (!might_format) {
-            if (*fmt != '%') {
-                out((int) *fmt, ctx);
-            }
-            else {
-                might_format = 1;
-                min_width = -1;
-                padding = PAD_NONE;
-                long_ctr = 0;
-            }
-        }
-        else {
-            switch (*fmt) {
-            case '-':
-                padding = PAD_SPACE_AFTER;
-                goto still_might_format;
-
-            case '0':
-                if (min_width < 0 && padding == PAD_NONE) {
-                    padding = PAD_ZERO_BEFORE;
-                    goto still_might_format;
-                }
-                /* Fall through */
-            case '1' ... '9':
-                if (min_width < 0) {
-                    min_width = *fmt - '0';
-                } else {
-                    min_width = 10 * min_width + *fmt - '0';
-                }
-
-                if (padding == PAD_NONE) {
-                    padding = PAD_SPACE_BEFORE;
-                }
-                goto still_might_format;
-
-            case 'l':
-                long_ctr++;
-                /* Fall through */
-            case 'z':
-            case 'h':
-                /* FIXME: do nothing for these modifiers */
-                goto still_might_format;
-
-            case 'd':
-            case 'i': {
-                int32 d;
-
-                if (long_ctr < 2) {
-                    d = _va_arg(ap, int32);
-                }
-                else {
-                    int64 lld = _va_arg(ap, int64);
-                    if (lld > INT32_MAX || lld < INT32_MIN) {
-                        print_err(out, ctx);
-                        break;
-                    }
-                    d = (int32)lld;
-                }
-
-                if (d < 0) {
-                    out((int)'-', ctx);
-                    d = -d;
-                    min_width--;
-                }
-                _printf_dec_uint(out, ctx, d, padding, min_width);
-                break;
-            }
-            case 'u': {
-                uint32 u;
-
-                if (long_ctr < 2) {
-                    u = _va_arg(ap, uint32);
-                }
-                else {
-                    uint64 llu = _va_arg(ap, uint64);
-                    if (llu > INT32_MAX) {
-                        print_err(out, ctx);
-                        break;
-                    }
-                    u = (uint32)llu;
-                }
-                _printf_dec_uint(out, ctx, u, padding, min_width);
-                break;
-            }
-            case 'p':
-                out('0', ctx);
-                out('x', ctx);
-                /* left-pad pointers with zeros */
-                padding = PAD_ZERO_BEFORE;
-                min_width = 8;
-                /* Fall through */
-            case 'x':
-            case 'X': {
-                uint64 x;
-                bool is_ptr = (*fmt == 'p') ? true : false;
-
-                if (long_ctr < 2) {
-                    x = _va_arg(ap, uint32);
-                } else {
-                    x = _va_arg(ap, uint64);
-                }
-                _printf_hex_uint(out, ctx, x, !is_ptr, padding, min_width);
-                break;
-            }
-
-            case 's': {
-                char *s;
-                char *start;
-                int32 s_offset = _va_arg(ap, uint32);
-
-                if (!validate_app_addr(s_offset, 1)) {
-                    wasm_runtime_set_exception(module_inst, "out of bounds memory access");
-                    return;
-                }
-
-                s = start = addr_app_to_native(s_offset);
-
-                while (*s)
-                    out((int) (*s++), ctx);
-
-                if (padding == PAD_SPACE_AFTER) {
-                    int remaining = min_width - (s - start);
-                    while (remaining-- > 0) {
-                        out(' ', ctx);
-                    }
-                }
-                break;
-            }
-
-            case 'c': {
-                int c = _va_arg(ap, int);
-                out(c, ctx);
-                break;
-            }
-
-            case '%': {
-                out((int) '%', ctx);
-                break;
-            }
-
-            default:
-                out((int) '%', ctx);
-                out((int) *fmt, ctx);
-                break;
-            }
-
-            might_format = 0;
-        }
-
-still_might_format:
-        ++fmt;
-    }
-}
-
-struct str_context {
-    char *str;
-    int max;
-    int count;
-};
-
-static int
-sprintf_out(int c, struct str_context *ctx)
-{
-    if (!ctx->str || ctx->count >= ctx->max) {
-        ctx->count++;
-        return c;
-    }
-
-    if (ctx->count == ctx->max - 1) {
-        ctx->str[ctx->count++] = '\0';
-    } else {
-        ctx->str[ctx->count++] = c;
-    }
-
-    return c;
-}
-
-static int
-printf_out(int c, struct str_context *ctx)
-{
-    bh_printf("%c", c);
-    ctx->count++;
-    return c;
-}
-
-static inline _va_list
-get_va_list(uint32 *args)
-{
-    union {
-        uint32 u;
-        _va_list v;
-    } u;
-    u.u = args[0];
-    return u.v;
-}
-
-static bool
-parse_printf_args(wasm_module_inst_t module_inst, int32 fmt_offset,
-                  int32 va_list_offset, const char **p_fmt,
-                  _va_list *p_va_args)
-{
-    const char *fmt;
-    union {
-        uintptr_t u;
-        _va_list v;
-    } u;
-
-    if (!validate_app_addr(fmt_offset, 1)
-        || !validate_app_addr(va_list_offset, sizeof(int32)))
-        return false;
-
-    fmt = (const char*) addr_app_to_native(fmt_offset);
-    u.u = (uintptr_t) addr_app_to_native(va_list_offset);
-
-    *p_fmt = fmt;
-    *p_va_args = u.v;
-    return true;
-}
-
-static int
-_printf_wrapper(int32 fmt_offset, int32 va_list_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    struct str_context ctx = { NULL, 0, 0 };
-    const char *fmt;
-    _va_list va_args;
-
-    if (!parse_printf_args(module_inst, fmt_offset, va_list_offset, &fmt, &va_args))
-        return 0;
-
-    _vprintf((out_func_t) printf_out, &ctx, fmt, va_args, module_inst);
-    return ctx.count;
-}
-
-static int
-_sprintf_wrapper(int32 str_offset, int32 fmt_offset, int32 va_list_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    struct str_context ctx;
-    char *str;
-    const char *fmt;
-    _va_list va_args;
-
-    if (!validate_app_addr(str_offset, 1))
-        return 0;
-
-    str = addr_app_to_native(str_offset);
-
-    if (!parse_printf_args(module_inst, fmt_offset, va_list_offset, &fmt, &va_args))
-        return 0;
-
-    ctx.str = str;
-    ctx.max = INT_MAX;
-    ctx.count = 0;
-
-    _vprintf((out_func_t) sprintf_out, &ctx, fmt, va_args, module_inst);
-
-    if (ctx.count < ctx.max) {
-        str[ctx.count] = '\0';
-    }
-
-    return ctx.count;
-}
-
-static int
-_snprintf_wrapper(int32 str_offset, int32 size, int32 fmt_offset,
-                  int32 va_list_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    struct str_context ctx;
-    char *str;
-    const char *fmt;
-    _va_list va_args;
-
-    if (!validate_app_addr(str_offset, size))
-        return 0;
-
-    str = addr_app_to_native(str_offset);
-
-    if (!parse_printf_args(module_inst, fmt_offset, va_list_offset, &fmt, &va_args))
-        return 0;
-
-    ctx.str = str;
-    ctx.max = size;
-    ctx.count = 0;
-
-    _vprintf((out_func_t) sprintf_out, &ctx, fmt, va_args, module_inst);
-
-    if (ctx.count < ctx.max) {
-        str[ctx.count] = '\0';
-    }
-
-    return ctx.count;
-}
-
-static int
-_puts_wrapper(int32 str_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    const char *str;
-
-    if (!validate_app_addr(str_offset, 1))
-        return 0;
-
-    str = addr_app_to_native(str_offset);
-    return bh_printf("%s\n", str);
-}
-
-static int
-_putchar_wrapper(int c)
-{
-    bh_printf("%c", c);
-    return 1;
-}
-#endif /* OPS_INPUT_OUTPUT */
-
-static int32
-_memcmp_wrapper(int32 s1_offset, int32 s2_offset, int32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *s1, *s2;
-
-    if (!validate_app_addr(s1_offset, size)
-        || !validate_app_addr(s2_offset, size))
-        return 0;
-
-    s1 = addr_app_to_native(s1_offset);
-    s2 = addr_app_to_native(s2_offset);
-    return memcmp(s1, s2, size);
-}
-
-static int32
-_memcpy_wrapper(int32 dst_offset, int32 src_offset, int32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *dst, *src;
-
-    if (size == 0)
-        return dst_offset;
-
-    if (!validate_app_addr(dst_offset, size)
-        || !validate_app_addr(src_offset, size))
-        return dst_offset;
-
-    dst = addr_app_to_native(dst_offset);
-    src = addr_app_to_native(src_offset);
-    memcpy(dst, src, size);
-    return dst_offset;
-}
-
-static int32
-_memmove_wrapper(int32 dst_offset, int32 src_offset, int32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *dst, *src;
-
-    if (!validate_app_addr(dst_offset, size)
-        || !validate_app_addr(src_offset, size))
-        return dst_offset;
-
-    dst = addr_app_to_native(dst_offset);
-    src = addr_app_to_native(src_offset);
-    memmove(dst, src, size);
-    return dst_offset;
-}
-
-static int32
-_memset_wrapper(int32 s_offset, int32 c, int32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *s;
-
-    if (!validate_app_addr(s_offset, size))
-        return s_offset;
-
-    s = addr_app_to_native(s_offset);
-    memset(s, c, size);
-    return s_offset;
-}
-
-#if OPS_UNSAFE_BUFFERS
-
-static int32
-_strdup_wrapper(int32 str_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char *str, *str_ret;
-    uint32 len;
-    int32 str_ret_offset = 0;
-
-    if (!validate_app_addr(str_offset, 1))
-        return 0;
-
-    str = addr_app_to_native(str_offset);
-
-    if (str) {
-        len = strlen(str) + 1;
-
-        str_ret_offset = module_malloc(len);
-        if (str_ret_offset) {
-            str_ret = addr_app_to_native(str_ret_offset);
-            memcpy(str_ret, str, len);
-        }
-    }
-
-    return str_ret_offset;
-}
-
-static int32
-_strchr_wrapper(int32 s_offset, int32 c)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    const char *s;
-    char *ret;
-
-    if (!validate_app_addr(s_offset, 1))
-        return s_offset;
-
-    s = addr_app_to_native(s_offset);
-    ret = strchr(s, c);
-    return ret ? addr_native_to_app(ret) : 0;
-}
-
-static int32
-_strcmp_wrapper(int32 s1_offset, int32 s2_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *s1, *s2;
-
-    if (!validate_app_addr(s1_offset, 1)
-        || !validate_app_addr(s2_offset, 1))
-        return 0;
-
-    s1 = addr_app_to_native(s1_offset);
-    s2 = addr_app_to_native(s2_offset);
-    return strcmp(s1, s2);
-}
-
-static int32
-_strncmp_wrapper(int32 s1_offset, int32 s2_offset, uint32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *s1, *s2;
-
-    if (!validate_app_addr(s1_offset, size)
-        || !validate_app_addr(s2_offset, size))
-        return 0;
-
-    s1 = addr_app_to_native(s1_offset);
-    s2 = addr_app_to_native(s2_offset);
-    return strncmp(s1, s2, size);
-}
-
-static int32
-_strcpy_wrapper(int32 dst_offset, int32 src_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char *dst, *src;
-
-    if (!validate_app_addr(dst_offset, 1)
-        || !validate_app_addr(src_offset, 1))
-        return 0;
-
-    dst = addr_app_to_native(dst_offset);
-    src = addr_app_to_native(src_offset);
-    strcpy(dst, src);
-    return dst_offset;
-}
-
-static int32
-_strncpy_wrapper(int32 dst_offset, int32 src_offset, uint32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char *dst, *src;
-
-    if (!validate_app_addr(dst_offset, size)
-        || !validate_app_addr(src_offset, size))
-        return 0;
-
-    dst = addr_app_to_native(dst_offset);
-    src = addr_app_to_native(src_offset);
-    strncpy(dst, src, size);
-    return dst_offset;
-}
-
-static uint32
-_strlen_wrapper(int32 s_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char *s;
-
-    if (!validate_app_addr(s_offset, 1))
-        return 0;
-
-    s = addr_app_to_native(s_offset);
-    return strlen(s);
-}
-
-#endif /* OPS_UNSAFE_BUFFERS */
-
-static int32
-_malloc_wrapper(uint32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    return module_malloc(size);
-}
-
-static int32
-_calloc_wrapper(uint32 nmemb, uint32 size)
-{
-    uint64 total_size = (uint64) nmemb * (uint64) size;
-    wasm_module_inst_t module_inst = get_module_inst();
-    uint32 ret_offset = 0;
-    uint8 *ret_ptr;
-
-    if (total_size > UINT32_MAX)
-        total_size = UINT32_MAX;
-
-    ret_offset = module_malloc((uint32 )total_size);
-    if (ret_offset) {
-        ret_ptr = addr_app_to_native(ret_offset);
-        memset(ret_ptr, 0, (uint32) total_size);
-    }
-
-    return ret_offset;
-}
-
-static void
-_free_wrapper(int32 ptr_offset)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-
-    if (!validate_app_addr(ptr_offset, 4))
-        return;
-    return module_free(ptr_offset);
-}
-
-static void
-setTempRet0_wrapper(uint32 temp_ret)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    wasm_runtime_set_temp_ret(module_inst, temp_ret);
-}
-
-static uint32
-getTempRet0_wrapper()
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    return wasm_runtime_get_temp_ret(module_inst);
-}
-
-static uint32
-_llvm_bswap_i16_wrapper(uint32 data)
-{
-    return (data & 0xFFFF0000)
-           | ((data & 0xFF) << 8)
-           | ((data & 0xFF00) >> 8);
-}
-
-static uint32
-_llvm_bswap_i32_wrapper(uint32 data)
-{
-    return ((data & 0xFF) << 24)
-           | ((data & 0xFF00) << 8)
-           | ((data & 0xFF0000) >> 8)
-           | ((data & 0xFF000000) >> 24);
-}
-
-static uint32
-_bitshift64Lshr_wrapper(uint32 uint64_part0, uint32 uint64_part1,
-                        uint32 bits)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    union {
-        uint64 value;
-        uint32 parts[2];
-    } u;
-
-    u.parts[0] = uint64_part0;
-    u.parts[1] = uint64_part1;
-
-    u.value >>= bits;
-    /* return low 32bit and save high 32bit to temp ret */
-    wasm_runtime_set_temp_ret(module_inst, (uint32) (u.value >> 32));
-    return (uint32) u.value;
-}
-
-static uint32
-_bitshift64Shl_wrapper(uint32 int64_part0, uint32 int64_part1,
-                       uint32 bits)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    union {
-        int64 value;
-        uint32 parts[2];
-    } u;
-
-    u.parts[0] = int64_part0;
-    u.parts[1] = int64_part1;
-
-    u.value <<= bits;
-    /* return low 32bit and save high 32bit to temp ret */
-    wasm_runtime_set_temp_ret(module_inst, (uint32) (u.value >> 32));
-    return (uint32) u.value;
-}
-
-static void
-_llvm_stackrestore_wrapper(uint32 llvm_stack)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    printf("_llvm_stackrestore called!\n");
-    wasm_runtime_set_llvm_stack(module_inst, llvm_stack);
-}
-
-static uint32
-_llvm_stacksave_wrapper()
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    printf("_llvm_stacksave called!\n");
-    return wasm_runtime_get_llvm_stack(module_inst);
-}
-
-static int32
-_emscripten_memcpy_big_wrapper(int32 dst_offset, int32 src_offset,
-                               uint32 size)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    void *dst, *src;
-
-    if (!validate_app_addr(dst_offset, size)
-        || !validate_app_addr(src_offset, size))
-        return dst_offset;
-
-    dst = addr_app_to_native(dst_offset);
-    src = addr_app_to_native(src_offset);
-
-    memcpy(dst, src, size);
-    return dst_offset;
-}
-
-static void
-abort_wrapper(int32 code)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char buf[32];
-    snprintf(buf, sizeof(buf), "env.abort(%i)", code);
-    wasm_runtime_set_exception(module_inst, buf);
-}
-
-static void
-abortStackOverflow_wrapper(int32 code)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char buf[32];
-    snprintf(buf, sizeof(buf), "env.abortStackOverflow(%i)", code);
-    wasm_runtime_set_exception(module_inst, buf);
-}
-
-static void
-nullFunc_X_wrapper(int32 code)
-{
-    wasm_module_inst_t module_inst = get_module_inst();
-    char buf[32];
-    snprintf(buf, sizeof(buf), "env.nullFunc_X(%i)", code);
-    wasm_runtime_set_exception(module_inst, buf);
-}
-
-/*#define ENABLE_SPEC_TEST 1*/
-
-#ifdef ENABLE_SPEC_TEST
-static void
-print_i32_wrapper(int i32)
-{
-    printf("%d\n", i32);
-}
-
-static void
-print_wrapper(int i32)
-{
-    printf("%d\n", i32);
-}
-#endif
-
-/* TODO: add function parameter/result types check */
-#define REG_NATIVE_FUNC(module_name, func_name)     \
-    { #module_name, #func_name, func_name##_wrapper }
-
-typedef struct WASMNativeFuncDef {
-    const char *module_name;
-    const char *func_name;
-    void *func_ptr;
-} WASMNativeFuncDef;
-
-static WASMNativeFuncDef native_func_defs[] = {
-
-#ifdef ENABLE_SPEC_TEST
-    REG_NATIVE_FUNC(spectest, print_i32),
-    REG_NATIVE_FUNC(spectest, print),
-#endif
-
-#if OPS_INPUT_OUTPUT
-    REG_NATIVE_FUNC(env, _printf),
-    REG_NATIVE_FUNC(env, _sprintf),
-    REG_NATIVE_FUNC(env, _snprintf),
-    REG_NATIVE_FUNC(env, _puts),
-    REG_NATIVE_FUNC(env, _putchar),
-#endif
-    REG_NATIVE_FUNC(env, _memcmp),
-    REG_NATIVE_FUNC(env, _memcpy),
-    REG_NATIVE_FUNC(env, _memmove),
-    REG_NATIVE_FUNC(env, _memset),
-#if OPS_UNSAFE_BUFFERS
-    REG_NATIVE_FUNC(env, _strchr),
-    REG_NATIVE_FUNC(env, _strcmp),
-    REG_NATIVE_FUNC(env, _strcpy),
-    REG_NATIVE_FUNC(env, _strlen),
-    REG_NATIVE_FUNC(env, _strncmp),
-    REG_NATIVE_FUNC(env, _strncpy),
-    REG_NATIVE_FUNC(env, _strdup),
-#endif
-    REG_NATIVE_FUNC(env, _malloc),
-    REG_NATIVE_FUNC(env, _calloc),
-    REG_NATIVE_FUNC(env, _free),
-    REG_NATIVE_FUNC(env, setTempRet0),
-    REG_NATIVE_FUNC(env, getTempRet0),
-    REG_NATIVE_FUNC(env, _llvm_bswap_i16),
-    REG_NATIVE_FUNC(env, _llvm_bswap_i32),
-    REG_NATIVE_FUNC(env, _bitshift64Lshr),
-    REG_NATIVE_FUNC(env, _bitshift64Shl),
-    REG_NATIVE_FUNC(env, _llvm_stackrestore),
-    REG_NATIVE_FUNC(env, _llvm_stacksave),
-    REG_NATIVE_FUNC(env, _emscripten_memcpy_big),
-    REG_NATIVE_FUNC(env, abort),
-    REG_NATIVE_FUNC(env, abortStackOverflow),
-    REG_NATIVE_FUNC(env, nullFunc_X)
-};
-
-void*
-wasm_native_func_lookup(const char *module_name, const char *func_name)
-{
-    uint32 size = sizeof(native_func_defs) / sizeof(WASMNativeFuncDef);
-    WASMNativeFuncDef *func_def = native_func_defs;
-    WASMNativeFuncDef *func_def_end = func_def + size;
-    void *ret;
-
-    if (!module_name || !func_name)
-        return NULL;
-
-    while (func_def < func_def_end) {
-        if (!strcmp(func_def->module_name, module_name)
-            && (!strcmp(func_def->func_name, func_name)
-                || (func_def->func_name[0] == '_'
-                    && !strcmp(func_def->func_name + 1, func_name))))
-            return (void*) (uintptr_t) func_def->func_ptr;
-        func_def++;
-    }
-
-    if ((ret = wasm_platform_native_func_lookup(module_name, func_name)))
-        return ret;
-
-    return NULL;
-}
-
-/*************************************
- * Global Variables                  *
- *************************************/
-
-typedef struct WASMNativeGlobalDef {
-    const char *module_name;
-    const char *global_name;
-    WASMValue global_data;
-} WASMNativeGlobalDef;
-
-static WASMNativeGlobalDef native_global_defs[] = {
-#ifdef ENABLE_SPEC_TEST
-    { "spectest", "global_i32", .global_data.u32 = 0 },
-#endif
-    { "env", "STACKTOP", .global_data.u32 = 0 },
-    { "env", "STACK_MAX", .global_data.u32 = 0 },
-    { "env", "ABORT", .global_data.u32 = 0 },
-    { "env", "memoryBase", .global_data.u32 = 0 },
-    { "env", "__memory_base", .global_data.u32 = 0 },
-    { "env", "tableBase", .global_data.u32 = 0 },
-    { "env", "__table_base", .global_data.u32 = 0 },
-    { "env", "DYNAMICTOP_PTR", .global_data.addr = 0 },
-    { "env", "tempDoublePtr", .global_data.addr = 0 },
-    { "global", "NaN", .global_data.u64 = 0x7FF8000000000000LL },
-    { "global", "Infinity", .global_data.u64 = 0x7FF0000000000000LL }
-};
-
-bool
-wasm_native_global_lookup(const char *module_name, const char *global_name,
-                          WASMGlobalImport *global)
-{
-    uint32 size = sizeof(native_global_defs) / sizeof(WASMNativeGlobalDef);
-    WASMNativeGlobalDef *global_def = native_global_defs;
-    WASMNativeGlobalDef *global_def_end = global_def + size;
-
-    if (!module_name || !global_name || !global)
-        return false;
-
-    /* Lookup constant globals which can be defined by table */
-    while (global_def < global_def_end) {
-        if (!strcmp(global_def->module_name, module_name)
-            && !strcmp(global_def->global_name, global_name)) {
-            global->global_data_linked = global_def->global_data;
-            return true;
-        }
-        global_def++;
-    }
-
-    /* Lookup non-constant globals which cannot be defined by table */
-    if (!strcmp(module_name, "env")) {
-#if 0 /* unsupported in sgx */
-        if (!strcmp(global_name, "_stdin")) {
-            global->global_data_linked.addr = (uintptr_t)stdin;
-            global->is_addr = true;
-            return true;
-        } else if (!strcmp(global_name, "_stdout")) {
-            global->global_data_linked.addr = (uintptr_t)stdout;
-            global->is_addr = true;
-            return true;
-        } else if (!strcmp(global_name, "_stderr")) {
-            global->global_data_linked.addr = (uintptr_t)stderr;
-            global->is_addr = true;
-            return true;
-        }
-#endif  /* OPS_INPUT_OUTPUT */
-    }
-
-    return false;
-}
-
-bool
-wasm_native_init()
-{
-    /* TODO: qsort the function defs and global defs. */
-    return true;
-}
diff --git a/core/iwasm/lib/native/libc/wasm_libc.cmake b/core/iwasm/lib/native/libc/wasm_libc.cmake
index f70b3b81a..52e55123f 100644
--- a/core/iwasm/lib/native/libc/wasm_libc.cmake
+++ b/core/iwasm/lib/native/libc/wasm_libc.cmake
@@ -17,7 +17,7 @@ set (WASM_LIBC_DIR ${CMAKE_CURRENT_LIST_DIR})
 include_directories(${WASM_LIBC_DIR})
 
 
-file (GLOB_RECURSE source_all ${WASM_LIBC_DIR}/libc_wrapper.c)
+file (GLOB_RECURSE source_all ${WASM_LIBC_DIR}/*.c)
 
 set (WASM_LIBC_SOURCE ${source_all})
 
diff --git a/core/iwasm/lib/native/libc/wasm_libc_sgx.cmake b/core/iwasm/lib/native/libc/wasm_libc_sgx.cmake
deleted file mode 100644
index c2f877097..000000000
--- a/core/iwasm/lib/native/libc/wasm_libc_sgx.cmake
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright (C) 2019 Intel Corporation.  All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set (WASM_LIBC_DIR ${CMAKE_CURRENT_LIST_DIR})
-
-include_directories(${WASM_LIBC_DIR})
-
-
-file (GLOB_RECURSE source_all ${WASM_LIBC_DIR}/libc_wrapper_sgx.c)
-
-set (WASM_LIBC_SOURCE ${source_all})
-
diff --git a/core/iwasm/products/linux-sgx/CMakeLists.txt b/core/iwasm/products/linux-sgx/CMakeLists.txt
index 4a53f9575..4d590a8ef 100644
--- a/core/iwasm/products/linux-sgx/CMakeLists.txt
+++ b/core/iwasm/products/linux-sgx/CMakeLists.txt
@@ -26,6 +26,7 @@ add_definitions(-DUSE_SGX=1)
 add_definitions(-DOPS_INPUT_OUTPUT=1)
 add_definitions(-DOPS_UNSAFE_BUFFERS=0)
 add_definitions(-DWASM_ENABLE_LOG=0)
+add_definitions(-Dbh_printf=bh_printf_sgx)
 
 # Enable repl mode if want to test spec cases
 # add_definitions(-DWASM_ENABLE_REPL)
@@ -71,19 +72,19 @@ include (../../runtime/platform/${PLATFORM}/platform.cmake)
 include (../../runtime/utils/utils.cmake)
 include (../../runtime/vmcore-wasm/vmcore.cmake)
 include (../../lib/native/base/wasm_lib_base.cmake)
-include (../../lib/native/libc/wasm_libc_sgx.cmake)
+include (../../lib/native/libc/wasm_libc.cmake)
 include (${SHARED_LIB_DIR}/platform/${PLATFORM}/shared_platform.cmake)
 include (${SHARED_LIB_DIR}/mem-alloc/mem_alloc.cmake)
-
-#add_executable (iwasm main.c ext_lib_export.c)
-
+include (${SHARED_LIB_DIR}/utils/shared_utils.cmake)
 
 add_library (vmlib
-             ext_lib_export.c
              ${WASM_PLATFORM_LIB_SOURCE}
              ${WASM_UTILS_LIB_SOURCE}
              ${VMCORE_LIB_SOURCE}
              ${WASM_LIB_BASE_DIR}/base_lib_export.c
              ${WASM_LIBC_SOURCE}
              ${PLATFORM_SHARED_SOURCE}
-             ${MEM_ALLOC_SHARED_SOURCE})
+             ${MEM_ALLOC_SHARED_SOURCE}
+             ${UTILS_SHARED_SOURCE})
+
+add_library (extlib ext_lib_export.c)
diff --git a/core/shared-lib/include/config.h b/core/shared-lib/include/config.h
index 63ad5efb3..a7c2a8b2d 100644
--- a/core/shared-lib/include/config.h
+++ b/core/shared-lib/include/config.h
@@ -26,9 +26,7 @@
 #define DEFAULT_MEM_ALLOCATOR MEM_ALLOCATOR_EMS
 
 /* Beihai log system */
-#ifndef BEIHAI_ENABLE_LOG
 #define BEIHAI_ENABLE_LOG 1
-#endif
 
 /* Beihai debugger support */
 #define BEIHAI_ENABLE_TOOL_AGENT 1
@@ -129,3 +127,7 @@
 /* Default base offset of external memory space */
 #define DEFAULT_EXT_MEM_BASE_OFFSET (-2 * BH_GB)
 
+#ifndef bh_printf
+#define bh_printf printf
+#endif
+
diff --git a/core/shared-lib/mem-alloc/ems/ems_kfc.c b/core/shared-lib/mem-alloc/ems/ems_kfc.c
index 0090c317b..4409d65db 100644
--- a/core/shared-lib/mem-alloc/ems/ems_kfc.c
+++ b/core/shared-lib/mem-alloc/ems/ems_kfc.c
@@ -30,7 +30,7 @@ int gci_check_platform()
 {
 #define CHECK(x, y)  do {                                       \
   if((x) != (y)) {                                              \
-    bh_printf("Platform checking failed on LINE %d at FILE %s.",   \
+    bh_printf("Platform checking failed on LINE %d at FILE %s.",\
            __LINE__, __FILE__);                                 \
     return GC_ERROR;                                            \
   }                                                             \
diff --git a/core/shared-lib/platform/alios/bh_platform.h b/core/shared-lib/platform/alios/bh_platform.h
index 468d0b4e9..e23958c95 100644
--- a/core/shared-lib/platform/alios/bh_platform.h
+++ b/core/shared-lib/platform/alios/bh_platform.h
@@ -52,8 +52,6 @@ typedef int64_t int64;
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
-#define bh_printf printf
-
 typedef aos_task_t korp_thread;
 typedef korp_thread *korp_tid;
 typedef aos_task_t *aos_tid_t;
diff --git a/core/shared-lib/platform/linux-sgx/bh_platform.c b/core/shared-lib/platform/linux-sgx/bh_platform.c
index 2166d53ab..d6f4c29ce 100644
--- a/core/shared-lib/platform/linux-sgx/bh_platform.c
+++ b/core/shared-lib/platform/linux-sgx/bh_platform.c
@@ -52,7 +52,7 @@ void bh_set_print_function(bh_print_function_t pf)
     print_function = pf;
 }
 
-int bh_printf(const char *message, ...)
+int bh_printf_sgx(const char *message, ...)
 {
     if (print_function != NULL) {
         char msg[FIXED_BUFFER_SIZE] = { '\0' };
diff --git a/core/shared-lib/platform/linux-sgx/bh_platform.h b/core/shared-lib/platform/linux-sgx/bh_platform.h
index 59cbb6d59..7a835ef84 100644
--- a/core/shared-lib/platform/linux-sgx/bh_platform.h
+++ b/core/shared-lib/platform/linux-sgx/bh_platform.h
@@ -38,7 +38,7 @@
 extern "C" {
 #endif
 
-extern int bh_printf(const char *message, ...);
+extern int bh_printf_sgx(const char *message, ...);
 
 typedef uint64_t uint64;
 typedef int64_t int64;
diff --git a/core/shared-lib/platform/linux/bh_platform.h b/core/shared-lib/platform/linux/bh_platform.h
index 2ee9e24f3..47172c1f6 100644
--- a/core/shared-lib/platform/linux/bh_platform.h
+++ b/core/shared-lib/platform/linux/bh_platform.h
@@ -77,8 +77,6 @@ typedef void* (*thread_start_routine_t)(void*);
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
-#define bh_printf printf
-
 int snprintf(char *buffer, size_t count, const char *format, ...);
 double fmod(double x, double y);
 float fmodf(float x, float y);
diff --git a/core/shared-lib/platform/vxworks/bh_platform.h b/core/shared-lib/platform/vxworks/bh_platform.h
index c023549da..142583e5b 100644
--- a/core/shared-lib/platform/vxworks/bh_platform.h
+++ b/core/shared-lib/platform/vxworks/bh_platform.h
@@ -75,8 +75,6 @@ typedef void* (*thread_start_routine_t)(void*);
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
-#define bh_printf printf
-
 int snprintf(char *buffer, size_t count, const char *format, ...);
 double fmod(double x, double y);
 float fmodf(float x, float y);
diff --git a/core/shared-lib/platform/zephyr/bh_platform.h b/core/shared-lib/platform/zephyr/bh_platform.h
index 45f8e14ee..2602bee31 100644
--- a/core/shared-lib/platform/zephyr/bh_platform.h
+++ b/core/shared-lib/platform/zephyr/bh_platform.h
@@ -78,8 +78,6 @@ typedef void* (*thread_start_routine_t)(void*);
 #define wa_malloc bh_malloc
 #define wa_free bh_free
 
-#define bh_printf printf
-
 /* Unit test framework is based on C++, where the declaration of
  snprintf is different.  */
 #ifndef __cplusplus