| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 8 | * This file contains Original Code and/or Modifications of Original Code |
| | 9 | * as defined in and that are subject to the Apple Public Source License |
| | 10 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 11 | * compliance with the License. Please obtain a copy of the License at |
| | 12 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 13 | * file. |
| | 14 | * |
| | 15 | * The Original Code and all software distributed under the License are |
| | 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 20 | * Please see the License for the specific language governing rights and |
| | 21 | * limitations under the License. |
| | 22 | * |
| | 23 | * @APPLE_LICENSE_HEADER_END@ |
| | 24 | */ |
| | 25 | #include <ppc/asm.h> |
| | 26 | #include <ppc/proc_reg.h> |
| | 27 | #include <cpus.h> |
| | 28 | #include <assym.s> |
| | 29 | #include <debug.h> |
| | 30 | #include <mach/ppc/vm_param.h> |
| | 31 | #include <ppc/exception.h> |
| | 32 | |
| | 33 | |
| | 34 | /* |
| | 35 | * The compiler generates calls to this function and passes address |
| | 36 | * of caller of the function [ from which mcount is called ] as the |
| | 37 | * first parameter. |
| | 38 | * mcount disables interrupts prior to call mcount() and restores |
| | 39 | * interrupt upon return. |
| | 40 | * To prevent recursive calls to mcount(), a flag, mcountOff, is set |
| | 41 | * in cpu_flags per_proc. |
| | 42 | */ |
| | 43 | |
| | 44 | .align 4 |
| | 45 | .globl mcount |
| | 46 | mcount: |
| | 47 | mflr r0 ; Load lr |
| | 48 | stw r0,8(r1) ; Save lr on the stack |
| | 49 | stwu r1,-64(r1) ; Get a stack frame |
| | 50 | mfmsr r9 ; Get msr |
| | 51 | rlwinm r9,r9,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off |
| | 52 | rlwinm r9,r9,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off |
| | 53 | rlwinm r8,r9,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions |
| | 54 | mtmsr r8 ; Update msr |
| | 55 | isync |
| | 56 | mfsprg r7,0 ; Get per_proc |
| | 57 | lhz r6,PP_CPU_FLAGS(r7) ; Get cpu flags |
| | 58 | ori r5,r6,mcountOff ; |
| | 59 | cmplw r5,r6 ; is mount off |
| | 60 | beq mcount_ret ; return if off |
| | 61 | sth r5,PP_CPU_FLAGS(r7) ; Update cpu_flags |
| | 62 | stw r9,FM_ARG0(r1) ; Save MSR |
| | 63 | mr r4, r0 |
| | 64 | bl _mcount ; Call the C routine |
| | 65 | lwz r9,FM_ARG0(r1) |
| | 66 | mfsprg r7,0 ; Get per-proc block |
| | 67 | lhz r6,PP_CPU_FLAGS(r7) ; Get CPU number |
| | 68 | li r5,mcountOff ; |
| | 69 | andc r6,r6,r5 ; Clear mcount_off |
| | 70 | sth r6,PP_CPU_FLAGS(r7) ; Save cpu_flags |
| | 71 | mcount_ret: |
| | 72 | addi r1,r1,64 |
| | 73 | mtmsr r9 ; Restore MSR |
| | 74 | lwz r0,8(r1) |
| | 75 | mtlr r0 |
| | 76 | blr |
| | 77 | |
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