projects / apple / xnu.git / blame
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|---|---|---|
| 55e303ae A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| e5568f75 A |
5 | * |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 55e303ae A |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| e5568f75 A |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 55e303ae A |
20 | * @APPLE_LICENSE_HEADER_END@ |
| 21 | */ | |
| 22 | #include <ppc/asm.h> | |
| 23 | #include <ppc/proc_reg.h> | |
| 24 | #include <cpus.h> | |
| 25 | #include <assym.s> | |
| 26 | #include <debug.h> | |
| 27 | #include <mach/ppc/vm_param.h> | |
| 28 | #include <ppc/exception.h> | |
| 29 | ||
| 30 | ||
| 31 | /* | |
| 32 | * The compiler generates calls to this function and passes address | |
| 33 | * of caller of the function [ from which mcount is called ] as the | |
| 34 | * first parameter. | |
| 35 | * mcount disables interrupts prior to call mcount() and restores | |
| 36 | * interrupt upon return. | |
| 37 | * To prevent recursive calls to mcount(), a flag, mcountOff, is set | |
| 38 | * in cpu_flags per_proc. | |
| 39 | */ | |
| 40 | ||
| 41 | .align 4 | |
| 42 | .globl mcount | |
| 43 | mcount: | |
| 44 | mflr r0 ; Load lr | |
| 45 | stw r0,8(r1) ; Save lr on the stack | |
| 46 | stwu r1,-64(r1) ; Get a stack frame | |
| 47 | mfmsr r9 ; Get msr | |
| 48 | rlwinm r9,r9,0,MSR_FP_BIT+1,MSR_FP_BIT-1 ; Force floating point off | |
| 49 | rlwinm r9,r9,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1 ; Force vectors off | |
| 50 | rlwinm r8,r9,0,MSR_EE_BIT+1,MSR_EE_BIT-1 ; Turn off interruptions | |
| 51 | mtmsr r8 ; Update msr | |
| 52 | isync | |
| 53 | mfsprg r7,0 ; Get per_proc | |
| 54 | lhz r6,PP_CPU_FLAGS(r7) ; Get cpu flags | |
| 55 | ori r5,r6,mcountOff ; | |
| 56 | cmplw r5,r6 ; is mount off | |
| 57 | beq mcount_ret ; return if off | |
| 58 | sth r5,PP_CPU_FLAGS(r7) ; Update cpu_flags | |
| 59 | stw r9,FM_ARG0(r1) ; Save MSR | |
| 60 | mr r4, r0 | |
| 61 | bl _mcount ; Call the C routine | |
| 62 | lwz r9,FM_ARG0(r1) | |
| 63 | mfsprg r7,0 ; Get per-proc block | |
| 64 | lhz r6,PP_CPU_FLAGS(r7) ; Get CPU number | |
| 65 | li r5,mcountOff ; | |
| 66 | andc r6,r6,r5 ; Clear mcount_off | |
| 67 | sth r6,PP_CPU_FLAGS(r7) ; Save cpu_flags | |
| 68 | mcount_ret: | |
| 69 | addi r1,r1,64 | |
| 70 | mtmsr r9 ; Restore MSR | |
| 71 | lwz r0,8(r1) | |
| 72 | mtlr r0 | |
| 73 | blr | |
| 74 |