/* * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * 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 * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #define __NO_UNDERSCORES__ #include <i386/asm.h> #include <assym.s> Entry(mcount) pushl %ebp // setup mcount's frame movl %esp,%ebp pushl %eax // save %eax pushf // save interrupt state cli // disable interrupts // // Check that this cpu is ready. // This delays the start of mcounting until a cpu is really prepared. // movl %gs:CPU_RUNNING,%eax testl %eax,%eax jz 1f // // Test for recursion as indicated by a per-cpu flag. // Skip if nested, otherwise set the flag and call the C mount(). // movl %gs:CPU_MCOUNT_OFF,%eax testl %eax,%eax // test for recursion jnz 1f 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 pushl 4(%ebp) // push selfpc parameter for mcount() pushl %eax // push frompc parameter for mcount() call _mcount // call the C mcount addl $8,%esp // pop args 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