X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Fswitch.S;h=feca86cd16d02e3d6f31d1dde25cff379c0861a4;hb=a03618133f7df0954802a470a4bee7674f7aed45;hp=6cb70aa86e38b8ad85c930376e260ce7ef43cf1d;hpb=575dc45e34db19ee7808c116e93485b37e0df716;p=pintos-anon

diff --git a/src/threads/switch.S b/src/threads/switch.S
index 6cb70aa..feca86c 100644
--- 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
@@ -56,10 +54,10 @@ switch_entry:
 	# Discard switch_threads() arguments.
 	addl $8, %esp
 
-	# Call schedule_tail(prev).
+	# Call thread_schedule_tail(prev).
 	pushl %eax
-.globl schedule_tail
-	call schedule_tail
+.globl thread_schedule_tail
+	call thread_schedule_tail
 	addl $4, %esp
 
 	# Start thread proper.