X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Fswitch.S;h=4f0d412c7266e3117d6fa33bdb2e9f598dbb63e8;hb=2d20cd50c41c87a90d49e4b7ace3d18b8fb34f23;hp=5bb56b55ec1a84de04295b39f23032bd1ae94e2b;hpb=f2f8875638593bd5365cfd6a5ba7c9578e52322f;p=pintos-anon

diff --git a/src/threads/switch.S b/src/threads/switch.S
index 5bb56b5..4f0d412 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
@@ -12,52 +12,54 @@
 #### restore the registers.  As part of switching stacks we record the
 #### current stack pointer in CUR's thread structure.
 
+	.intel_syntax noprefix
+
 .globl 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.
+	# Note that the SVR4 ABI allows us to destroy eax, ecx, edx,
+	# 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().
-	pushl %ebx
-	pushl %ebp
-	pushl %esi
-	pushl %edi
+	push ebx
+	push ebp
+	push esi
+	push edi
 
 	# Get offsetof (struct thread, stack).
 .globl thread_stack_ofs
-	mov thread_stack_ofs, %edx
+	mov edx, thread_stack_ofs
 
 	# Save current stack pointer to old thread's stack, if any.
-	movl SWITCH_CUR(%esp), %eax
-	test %eax, %eax
+	mov eax, SWITCH_CUR[esp]
+	test eax, eax
 	jz 1f
-	movl %esp, (%eax,%edx,1)
+	mov [eax + edx], esp
 1:
 
 	# Restore stack pointer from new thread's stack.
-	movl SWITCH_NEXT(%esp), %ecx
-	movl (%ecx,%edx,1), %esp
+	mov ecx, SWITCH_NEXT[esp]
+	mov esp, [ecx + edx]
 
 	# Restore caller's register state.
-	popl %edi
-	popl %esi
-	popl %ebp
-	popl %ebx
+	pop edi
+	pop esi
+	pop ebp
+	pop ebx
         ret
 
 .globl switch_entry
 switch_entry:
 	# Discard switch_threads() arguments.
-	addl $8, %esp
+	add esp, 8
 
 	# Call schedule_tail(prev).
-	pushl %eax
+	push eax
 .globl schedule_tail
 	call schedule_tail
-	addl $4, %esp
+	add esp, 4
 
 	# Start thread proper.
 	ret