🆕 libc新增_start函数，实现main的返回值的捕获

user/apps/about/about.c

@@ -25,7 +25,8 @@ int main()
     // printf("Hello World!\n");
     print_ascii_logo();
     print_copyright();
-    exit(0);
-    while (1)
-        ;
+    // exit(0);
+    // while (1)
+    //     ;
+    return 0;
 }

user/apps/about/about.lds

@@ -1,7 +1,7 @@
 
 OUTPUT_FORMAT("elf64-x86-64","elf64-x86-64","elf64-x86-64")
 OUTPUT_ARCH(i386:x86-64)
-ENTRY(main)
+ENTRY(_start)
 
 SECTIONS
 {