New option -r to reboot the VM after actions are complete.

[pintos-anon] / src / threads / switch.S

diff --git a/src/threads/switch.S b/src/threads/switch.S
index 6cb70aa86e38b8ad85c930376e260ce7ef43cf1d..244249e07c063594fc3f385937781d22b0bd2371 100644 (file)
--- a/src/threads/switch.S
+++ b/src/threads/switch.S
@@ -21,7 +21,8 @@ switch_threads:
        # but requires us to preserve %ebx, %ebp, %esi, %edi.  See
        # [SysV-ABI-386] pages 3-11 and 3-12 for details.
        #
-       # This stack frame must match the one set up by thread_create().
+       # This stack frame must match the one set up by thread_create()
+       # in size.
        pushl %ebx
        pushl %ebp
        pushl %esi
@@ -33,10 +34,7 @@ switch_threads:
 
        # Save current stack pointer to old thread's stack, if any.
        movl SWITCH_CUR(%esp), %eax
-       test %eax, %eax
-       jz 1f
        movl %esp, (%eax,%edx,1)
-1:
 
        # Restore stack pointer from new thread's stack.
        movl SWITCH_NEXT(%esp), %ecx