update name of code to labcodes

labcodes/lab8/kern/process/switch.S

@@ -0,0 +1,30 @@
+.text
+.globl switch_to
+switch_to:                      # switch_to(from, to)
+
+    # save from's registers
+    movl 4(%esp), %eax          # eax points to from
+    popl 0(%eax)                # save eip !popl
+    movl %esp, 4(%eax)
+    movl %ebx, 8(%eax)
+    movl %ecx, 12(%eax)
+    movl %edx, 16(%eax)
+    movl %esi, 20(%eax)
+    movl %edi, 24(%eax)
+    movl %ebp, 28(%eax)
+
+    # restore to's registers
+    movl 4(%esp), %eax          # not 8(%esp): popped return address already
+                                # eax now points to to
+    movl 28(%eax), %ebp
+    movl 24(%eax), %edi
+    movl 20(%eax), %esi
+    movl 16(%eax), %edx
+    movl 12(%eax), %ecx
+    movl 8(%eax), %ebx
+    movl 4(%eax), %esp
+
+    pushl 0(%eax)               # push eip
+
+    ret
+