projects / apple / xnu.git / blame
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|---|---|---|
| 55e303ae A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 8ad349bb A |
4 | * @APPLE_LICENSE_OSREFERENCE_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 | |
| 10 | * License may not be used to create, or enable the creation or | |
| 11 | * redistribution of, unlawful or unlicensed copies of an Apple operating | |
| 12 | * system, or to circumvent, violate, or enable the circumvention or | |
| 13 | * violation of, any terms of an Apple operating system software license | |
| 14 | * agreement. | |
| 37839358 | 15 | * |
| 8ad349bb A |
16 | * Please obtain a copy of the License at |
| 17 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 18 | * file. | |
| 37839358 | 19 | * |
| 8ad349bb A |
20 | * The Original Code and all software distributed under the License are |
| 21 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 22 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 23 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 25 | * Please see the License for the specific language governing rights and | |
| 26 | * limitations under the License. | |
| 37839358 | 27 | * |
| 8ad349bb | 28 | * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ |
| 55e303ae A |
29 | */ |
| 30 | #include <ppc/asm.h> | |
| 31 | #include <ppc/proc_reg.h> | |
| 55e303ae A |
32 | #include <assym.s> |
| 33 | #include <debug.h> | |
| 34 | #include <mach/ppc/vm_param.h> | |
| 35 | #include <ppc/exception.h> | |
| 36 | ||
| 37 | ||
| 38 | /* | |
| 39 | * The compiler generates calls to this function and passes address | |
| 40 | * of caller of the function [ from which mcount is called ] as the | |
| 41 | * first parameter. | |
| 42 | * mcount disables interrupts prior to call mcount() and restores | |
| 43 | * interrupt upon return. | |
| 44 | * To prevent recursive calls to mcount(), a flag, mcountOff, is set | |
| 45 | * in cpu_flags per_proc. | |
| 46 | */ | |
| 47 | ||
| 48 | .align 4 | |
| 49 | .globl mcount | |
| 50 | mcount: | |
| 51 | mflr r0 ; Load lr | |
| 52 | stw r0,8(r1) ; Save lr on the stack | |
| 53 | stwu r1,-64(r1) ; Get a stack frame | |
| 54 | mfmsr r9 ; Get msr | |
| 55 | rlwinm r9,r9,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off | |
| 56 | rlwinm r9,r9,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off | |
| 57 | rlwinm r8,r9,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions | |
| 58 | mtmsr r8 ; Update msr | |
| 59 | isync | |
| 91447636 A |
60 | mfsprg r7,1 ; Get the current activation |
| 61 | lwz r7,ACT_PER_PROC(r7) ; Get the per_proc block | |
| 55e303ae A |
62 | lhz r6,PP_CPU_FLAGS(r7) ; Get cpu flags |
| 63 | ori r5,r6,mcountOff ; | |
| 64 | cmplw r5,r6 ; is mount off | |
| 65 | beq mcount_ret ; return if off | |
| 66 | sth r5,PP_CPU_FLAGS(r7) ; Update cpu_flags | |
| 67 | stw r9,FM_ARG0(r1) ; Save MSR | |
| 68 | mr r4, r0 | |
| 69 | bl _mcount ; Call the C routine | |
| 70 | lwz r9,FM_ARG0(r1) | |
| 91447636 A |
71 | mfsprg r7,1 ; Get the current activation |
| 72 | lwz r7,ACT_PER_PROC(r7) ; Get the per_proc block | |
| 55e303ae A |
73 | lhz r6,PP_CPU_FLAGS(r7) ; Get CPU number |
| 74 | li r5,mcountOff ; | |
| 75 | andc r6,r6,r5 ; Clear mcount_off | |
| 76 | sth r6,PP_CPU_FLAGS(r7) ; Save cpu_flags | |
| 77 | mcount_ret: | |
| 78 | addi r1,r1,64 | |
| 79 | mtmsr r9 ; Restore MSR | |
| 80 | lwz r0,8(r1) | |
| 81 | mtlr r0 | |
| 82 | blr | |
| 83 |