Add: exec feature for binaries

src/kernel/kmain.c

@@ -120,17 +120,6 @@ void kmain(multiboot2_info *mb_info)
 
     // usually the place where i do testing
 
-    void* binary_file = load_file_from_initrd((uint8_t*)initrd_addr, "./hello.bin");
-    if (binary_file == NULL)
-    {
-	printf("[debug] Failed to load test program!\n");
-    } else {
-	printf("[debug] Test program loaded!\n");
-    }
-
-    void (*program_entry)() = (void (*)())binary_file;
-    program_entry();
-
     timer_install();
     keyboard_install();
     printf("[kernel] spawning shell...\n"); 

src/kernel/loader.s

@@ -225,7 +225,7 @@ syscall_common_stub:
 	
 	mov eax, ds
 	push eax	; save ds
-	mov ax, 0x10	; kernel segment
+	mov ax, 0x01	; kernel segment YES I CHEATED I KNOW THIS SUCKS
 	mov ds, ax
 	mov es, ax
 	

src/kernel/shell.c

@@ -146,6 +146,7 @@ void shell_install()
   register_command("lspci", program_lspci);
   register_command("naval", program_navalbattle);
   register_command("snake", program_snake);
+  register_command("exec", program_exec);
 
   for (;;)
   {

src/kernel/syscalls.c

@@ -5,7 +5,7 @@
 
 #include "../libc/stdio.h"
 
-void handle_syscall(int syscall_number, void* arg)
+void handle_syscall(int syscall_number)
 {
 	switch(syscall_number)
 	{
@@ -29,5 +29,5 @@ void syscall_handler()
 
 	printf("[syscall] syscall_number=%d, arg=%p\n", syscall_number, arg);
 
-	handle_syscall(syscall_number, arg);
+	handle_syscall(syscall_number);
 }