diff --git a/src/libruntime/target/linux/asm_x64.h b/src/libruntime/target/linux/asm_x64.h
new file mode 100644
index 000000000..59bece276
--- /dev/null
+++ b/src/libruntime/target/linux/asm_x64.h
@@ -0,0 +1,67 @@
+/* Copyright 2014 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ */
+
+#ifndef LINUX_X64_ASM_H
+#define LINUX_X64_ASM_H
+
+/*
+ * mov syscall_no -> %rax
+ * mov arg1 -> %rdi
+ * syscall
+ * mov %rax -> ret
+ */
+#define SYSCALL_1( syscall_no, arg1, ret) \
+    __asm ( "syscall" \
+          : "=a" ( ret ) \
+          : "a" (syscall_no), "D" (arg1) \
+          : "rcx", "r11" );
+
+/*
+ * mov syscall_no -> %rax
+ * mov arg1 -> %rdi
+ * mov arg2 -> %rsi
+ * syscall
+ * mov %rax -> ret
+ */
+#define SYSCALL_2( syscall_no, arg1, arg2, ret) \
+    __asm ( "syscall" \
+          : "=a" ( ret ) \
+          : "a" (syscall_no), "D" (arg1), "S" (arg2) \
+          : "rcx", "r11" );
+
+/*
+ * mov syscall_no -> %rax
+ * mov arg1 -> %rdi
+ * mov arg2 -> %rsi
+ * mov arg2 -> %rdx
+ * syscall
+ * mov %rax -> ret
+ */
+#define SYSCALL_3( syscall_no, arg1, arg2, arg3, ret) \
+    __asm ( "syscall" \
+          : "=a" ( ret ) \
+          : "a" (syscall_no), "D" (arg1), "S" (arg2), "d" (arg3) \
+          : "rcx", "r11" );
+
+#define _START            \
+   mov (%rsp), %rdi;      \
+   mov %rsp, %rsi;        \
+   add $8, %rsi;          \
+   callq main;            \
+                          \
+   mov %rax, %rdi;        \
+   callq __exit;
+
+#endif /* !LINUX_X64_ASM_H */
diff --git a/src/libruntime/target/linux/asm_x86.h b/src/libruntime/target/linux/asm_x86.h
new file mode 100644
index 000000000..d4efd1697
--- /dev/null
+++ b/src/libruntime/target/linux/asm_x86.h
@@ -0,0 +1,69 @@
+/* Copyright 2014 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ */
+
+#ifndef LINUX_X86_ASM_H
+#define LINUX_X86_ASM_H
+
+FIXME( Implement x86 ABI );
+
+/*
+ * mov syscall_no -> %rax
+ * mov arg1 -> %rdi
+ * syscall
+ * mov %rax -> ret
+ */
+#define SYSCALL_1( syscall_no, arg1, ret) \
+    __asm ( "syscall" \
+          : "=a" ( ret ) \
+          : "a" (syscall_no), "D" (arg1) \
+          : "rcx", "r11" );
+
+/*
+ * mov syscall_no -> %rax
+ * mov arg1 -> %rdi
+ * mov arg2 -> %rsi
+ * syscall
+ * mov %rax -> ret
+ */
+#define SYSCALL_2( syscall_no, arg1, arg2, ret) \
+    __asm ( "syscall" \
+          : "=a" ( ret ) \
+          : "a" (syscall_no), "D" (arg1), "S" (arg2) \
+          : "rcx", "r11" );
+
+/*
+ * mov syscall_no -> %rax
+ * mov arg1 -> %rdi
+ * mov arg2 -> %rsi
+ * mov arg2 -> %rdx
+ * syscall
+ * mov %rax -> ret
+ */
+#define SYSCALL_3( syscall_no, arg1, arg2, arg3, ret) \
+    __asm ( "syscall" \
+          : "=a" ( ret ) \
+          : "a" (syscall_no), "D" (arg1), "S" (arg2), "d" (arg3) \
+          : "rcx", "r11" );
+
+#define _START            \
+   mov (%rsp), %rdi;      \
+   mov %rsp, %rsi;        \
+   add $8, %rsi;          \
+   callq main;            \
+                          \
+   mov %rax, %rdi;        \
+   callq __exit;
+
+#endif /* !LINUX_X86_ASM_H */