more userspace stuff

kernel/syscall.S

@@ -4,33 +4,33 @@
 syscall_handler: 
     cli
 
-    push $0
-    push $0x80
+    pushfl          
+    pushl %cs
 
-    pusha
+    movl 8(%esp), %eax      
+    pushl %eax
+    movl 4(%esp), %ebx      # Get CS
+    movl %ebx, 8(%esp)      # Move CS over Old EIP
+    movl 0(%esp), %ebx      # Get Return EIP
+    movl %ebx, 4(%esp)      # Move Return EIP over CS
+    addl $4, %esp           # Adjust stack pointer
 
-    push %ds
-    push %es
-    push %fs
-    push %gs
+    movw %ds, %ax
+    pushl %eax
 
-    mov $0x10, %ax               
-    mov %ax, %ds
-    mov %ax, %es
-    mov %ax, %fs
-    mov %ax, %gs
+    pushal
+
+    pushl %esp
+    call switch_context
+    movl %eax, %esp
+
+    popal
     
-    push %esp
-    call syscall
-    add $4, %esp
-    
-    mov 28(%esp), %eax
+    popl %eax
+    movw %ax, %ds
+    movw %ax, %es
+    movw %ax, %fs
+    movw %ax, %gs
 
-    pop %gs
-    pop %fs
-    pop %es
-    pop %ds
-
-    popa
-    add $8, %esp
+    sti
     iret