Start implementing syscalls

arch/syscall.c

@@ -1,9 +1,22 @@
 #include "interrupt.h"
 #include "kprintf.h"
 
-void syscall_handler(struct IsrRegisters regs)
+#include <kernelmq/syscall.h>
+
+static void syscall_do_exit(struct IsrRegisters regs);
+
+void syscall_handler(const struct IsrRegisters regs)
 {
     const unsigned int id = regs.eax & 0xFFFF;
 
+    switch (id) {
+        case KERNELMQ_SYSCALL_EXIT: return syscall_do_exit(regs);
+    }
+
     kprintf("syscall %u\n", id);
 }
+
+void syscall_do_exit(const struct IsrRegisters regs)
+{
+    kprintf("process try to exit with error code %u, haha\n", regs.ebx & 0xFFFF);
+}

include/kernelmq/syscall.h

@@ -0,0 +1,16 @@
+#ifndef KERNELMQ_INCLUDED_SYSCALL
+#define KERNELMQ_INCLUDED_SYSCALL 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum KernelMQ_Syscall_Number {
+    KERNELMQ_SYSCALL_EXIT = 0,
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

modules/dummy.asm

@@ -1,11 +1,12 @@
 main:
-    mov eax, 0
-    int 0x80
-
     mov eax, 512
     int 0x80
 
     mov eax, 35000
     int 0x80
 
+    mov eax, 0 ; exit
+    mov ebx, 0 ; error code
+    int 0x80
+
     ret