Fun

App.h

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+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class App */
+
+#ifndef _Included_App
+#define _Included_App
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     App
+ * Method:    add
+ * Signature: (II)I
+ */
+JNIEXPORT jint JNICALL Java_App_add
+  (JNIEnv *, jclass, jint, jint);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

App.java

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+import java.lang.System;
+import java.util.Scanner;
+
+public class App {
+    static {
+        System.loadLibrary("calc");
+    }
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Number 1: ");
+        int num1 = sc.nextInt();
+        System.out.print("Number 2: ");
+        int num2 = sc.nextInt();
+
+        System.out.printf("Nums from C and ASM %d\n", add(num1, num2));
+    }
+
+    private static native int add(int x, int y);
+}

calc.S

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+.intel_syntax noprefix
+
+.text
+.globl add
+.type add, @function
+
+# rdi - arg1
+# rsi - arg2
+add:
+    lea eax, [rdi + rsi]
+    ret
+    ret
+
+.section .note.GNU-stack,"",@progbits

prog.c

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+#include <stdio.h>
+#include <jni.h>
+#include "App.h"
+
+extern int add(int, int);
+
+JNIEXPORT jint JNICALL Java_App_add(JNIEnv *jniEnv, jclass class, jint jX, jint jY) {
+    return (jint)add((int)jX,(int)jY);
+}
+
+//int main() {
+//    printf("Hello, world!\n");
+//    printf("Number %d from ASM!\n", add(42, 28));
+//    return 0;
+//}