1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28#include <ppc/asm.h> 29#include <ppc/proc_reg.h> 30#include <assym.s> 31#include <debug.h> 32#include <mach/ppc/vm_param.h> 33#include <ppc/exception.h> 34 35 36/* 37 * The compiler generates calls to this function and passes address 38 * of caller of the function [ from which mcount is called ] as the 39 * first parameter. 40 * mcount disables interrupts prior to call mcount() and restores 41 * interrupt upon return. 42 * To prevent recursive calls to mcount(), a flag, mcountOff, is set 43 * in cpu_flags per_proc. 44 */ 45 46 .align 4 47 .globl mcount 48mcount: 49 mflr r0 ; Load lr 50 stw r0,8(r1) ; Save lr on the stack 51 stwu r1,-64(r1) ; Get a stack frame 52 mfmsr r9 ; Get msr 53 rlwinm r9,r9,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off 54 rlwinm r9,r9,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off 55 rlwinm r8,r9,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions 56 mtmsr r8 ; Update msr 57 isync 58 mfsprg r7,1 ; Get the current activation 59 lwz r7,ACT_PER_PROC(r7) ; Get the per_proc block 60 lhz r6,PP_CPU_FLAGS(r7) ; Get cpu flags 61 ori r5,r6,mcountOff ; 62 cmplw r5,r6 ; is mount off 63 beq mcount_ret ; return if off 64 sth r5,PP_CPU_FLAGS(r7) ; Update cpu_flags 65 stw r9,FM_ARG0(r1) ; Save MSR 66 mr r4, r0 67 bl _mcount ; Call the C routine 68 lwz r9,FM_ARG0(r1) 69 mfsprg r7,1 ; Get the current activation 70 lwz r7,ACT_PER_PROC(r7) ; Get the per_proc block 71 lhz r6,PP_CPU_FLAGS(r7) ; Get CPU number 72 li r5,mcountOff ; 73 andc r6,r6,r5 ; Clear mcount_off 74 sth r6,PP_CPU_FLAGS(r7) ; Save cpu_flags 75mcount_ret: 76 addi r1,r1,64 77 mtmsr r9 ; Restore MSR 78 lwz r0,8(r1) 79 mtlr r0 80 blr 81 82