/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_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. 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_LICENSE_HEADER_END@ */ #import <architecture/i386/asm_help.h> .text .globl mcount mcount: pushq %rbp // setup mcount's frame movq %rsp,%rbp // The compiler doesn't preserve registers when calling mcount // so we have to ensure that we don't trash any. subq $8, %rsp // maintain 16-byte alignment pushq %rdi pushq %rsi pushq %rax movq (%rbp),%rax // load the frame pointer of mcount's caller movq 8(%rax),%rax // load mcount's caller's return address movq 8(%rbp),%rdi // set up the selfpc parameter for moncount() movq %rax,%rsi // set up the frompc parameter for moncount() CALL_EXTERN(_moncount) // call moncount() popq %rax popq %rsi popq %rdi // No need for an addq because we're restoring %rsp in the // next instruction. movq %rbp,%rsp // tear down mcount's frame popq %rbp ret