implement kernel panic

common.c

@@ -84,7 +84,9 @@ char *strcpy(char *dst, const char *src) {
     *d++ = *src++;
   *d = '\0';
   return dst;
-}
+} // The strcpy function continues copying even if
+  // src is longer than the memory area of dst. 
+  // This can easily lead to bugs and vulnerabilities
 
 int strcmp(const char *s1, const char *s2) {
   while (*s1 && *s2) {

kernel.c

@@ -27,12 +27,17 @@ void putchar(char ch) {
 }
 
 void kernel_main(void) {
-    printf("\n\nHello %s\n", "RETARD!");
+    // printf("\n\nHello %s\n", "friend :3");
-    printf("60 + 9 = %d, %x\n", 60 + 9, 0x1234abcd);
+    // printf("60 + 9 = %d, %x\n", 60 + 9, 0x1234abcd);
+    //
+    // for (;;) {
+    //     __asm__ __volatile__("wfi");
+    // }
+    
+    memset(__bss, 0, (size_t) __bss_end - (size_t) __bss);
 
-    for (;;) {
+    PANIC("BOOOO!!! GET INFECTED WITH BOOTKID YOU SKID! 0x1337h@x0r");
-        __asm__ __volatile__("wfi");
+    printf("you lucky bitch got away\n");
-    }
 }
 
 __attribute__((section(".text.boot")))

kernel.h

@@ -4,3 +4,9 @@ struct sbiret {
     long error;
     long value;
 };
+
+#define PANIC(fmt, ...)                                                                             \
+    do {                                                                                            \
+        printf("YOU GOT A PANIC ERROR: %s:%d: " fmt "\n", __FILE__, __LINE__, ##__VA_ARGS__);       \
+        while (1) {}                                                                                \
+    } while (0)