/* * 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) pushq %rbp // setup mcount's frame movq %rsp,%rbp pushq %rax // 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. // mov %gs,%ax test %ax,%ax jz 1f 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 movq (%rbp),%rax // frame pointer of mcount's caller pushq %rdi pushq %rsi pushq %rdx pushq %rcx pushq %r8 pushq %r9 movq 8(%rax),%rdi // mcount's caller's return address movq 8(%rbp),%rsi // push selfpc parameter for mcount() call _mcount // call the C mcount popq %r9 popq %r8 popq %rcx popq %rdx popq %rsi popq %rdi decl %gs:CPU_MCOUNT_OFF // turn off recursion flag 1: popf // restore interrupt state popq %rax movq %rbp,%rsp // tear down mcount's frame popq %rbp ret