xnu-792.13.8.tar.gz

[apple/xnu.git] / osfmk / i386 / mcount.s

diff --git a/osfmk/i386/mcount.s b/osfmk/i386/mcount.s
index 77c5a07bcbc3d335248c09fae8fab96c7773aefb..d0fd981684b87040f54cb5c6c9ac296ad2c2d017 100644 (file)
--- a/osfmk/i386/mcount.s
+++ b/osfmk/i386/mcount.s
@@ -1,26 +1,31 @@
 /*
  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
  * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
- * 
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
+ * This file contains Original Code and/or Modifications of Original Code 
+ * as defined in and that are subject to the Apple Public Source License 
+ * Version 2.0 (the 'License'). You may not use this file except in 
+ * compliance with the License.  The rights granted to you under the 
+ * License may not be used to create, or enable the creation or 
+ * redistribution of, unlawful or unlicensed copies of an Apple operating 
+ * system, or to circumvent, violate, or enable the circumvention or 
+ * violation of, any terms of an Apple operating system software license 
+ * agreement.
+ *
+ * Please obtain a copy of the License at 
+ * http://www.opensource.apple.com/apsl/ and read it before using this 
  * file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
+ *
+ * The Original Code and all software distributed under the License are 
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
+ * Please see the License for the specific language governing rights and 
  * limitations under the License.
- * 
- * @APPLE_LICENSE_HEADER_END@
+ *
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  */
 
 #define __NO_UNDERSCORES__
@@ -30,23 +35,15 @@
 Entry(mcount)
         pushl   %ebp                   // setup mcount's frame
         movl    %esp,%ebp
+        pushl  %eax                    // save %eax
         pushf                          // save interrupt state
         cli                            // disable interrupts
 
-       //
-       // Check that %gs, with segment pointing at the per-cpu data area,
-       // has been set up. C routines (mp_desc_init() in particular) may
-       // be called very early before this happens.
-       //
-       mov     %gs,%ax
-       test    %ax,%ax
-       jz      1f
-
        //
        // Check that this cpu is ready.
        // This delays the start of mcounting until a cpu is really prepared.
        //
-        movl   %gs:CPD_CPU_STATUS,%eax
+        movl   %gs:CPU_RUNNING,%eax
         testl  %eax,%eax
        jz      1f
 
@@ -54,10 +51,11 @@ Entry(mcount)
        // Test for recursion as indicated by a per-cpu flag.
        // Skip if nested, otherwise set the flag and call the C mount().
        //
-        movl   %gs:CPD_MCOUNT_OFF,%eax
+        movl   %gs:CPU_MCOUNT_OFF,%eax
         testl  %eax,%eax               // test for recursion
         jnz    1f
-        incl   %gs:CPD_MCOUNT_OFF      // set recursion flag
+
+        incl   %gs:CPU_MCOUNT_OFF      // set recursion flag
 
         movl    (%ebp),%eax            // frame pointer of mcount's caller
         movl    4(%eax),%eax           // mcount's caller's return address
@@ -66,9 +64,10 @@ Entry(mcount)
         call   _mcount                 // call the C mcount
        addl    $8,%esp                 // pop args
 
-        decl   %gs:CPD_MCOUNT_OFF      // turn off recursion flag
+        decl   %gs:CPU_MCOUNT_OFF      // turn off recursion flag
 1:
         popf                           // restore interrupt state
+        popl   %eax
         movl    %ebp,%esp              // tear down mcount's frame
         popl    %ebp
         ret