X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Fswitch.S;h=feca86cd16d02e3d6f31d1dde25cff379c0861a4;hb=64e74e3536b95c4d0a46aec56bc373ad0f6d470b;hp=5bb56b55ec1a84de04295b39f23032bd1ae94e2b;hpb=f2f8875638593bd5365cfd6a5ba7c9578e52322f;p=pintos-anon

diff --git a/src/threads/switch.S b/src/threads/switch.S
index 5bb56b5..feca86c 100644
--- a/src/threads/switch.S
+++ b/src/threads/switch.S
@@ -3,7 +3,7 @@
 #### struct thread *switch_threads (struct thread *cur, struct thread *next);
 ####
 #### Switches from CUR, which must be the running thread, to NEXT,
-#### which must also be running thread_switch(), returning CUR in
+#### which must also be running switch_threads(), returning CUR in
 #### NEXT's context.
 ####
 #### This function works by assuming that the thread we're switching
@@ -12,15 +12,17 @@
 #### restore the registers.  As part of switching stacks we record the
 #### current stack pointer in CUR's thread structure.
 
-.globl switch_threads 
+.globl switch_threads
+.func switch_threads
 switch_threads:
 	# Save caller's register state.
 	#
 	# Note that the SVR4 ABI allows us to destroy %eax, %ecx, %edx,
 	# but requires us to preserve %ebx, %ebp, %esi, %edi.  See
-	# [SV-ABI-386] pages 3-11 and 3-12 for details.
+	# [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
@@ -32,10 +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
@@ -47,17 +46,20 @@ switch_threads:
 	popl %ebp
 	popl %ebx
         ret
+.endfunc
 
 .globl switch_entry
+.func switch_entry
 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.
 	ret
+.endfunc