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