mcount.s

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    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
   14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   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  *
   20  * @APPLE_LICENSE_HEADER_END@
   21  */
   22 #include <ppc/asm.h>
   23 #include <ppc/proc_reg.h>
   24 #include <assym.s>
   25 #include <debug.h>
   26 #include <mach/ppc/vm_param.h>
   27 #include <ppc/exception.h>
   28 
   29 
   30 /*
   31  * The compiler generates calls to this function and passes address
   32  * of caller of the function [ from which mcount is called ] as the
   33  * first parameter.
   34  * mcount disables interrupts prior to call mcount() and restores 
   35  * interrupt upon return.
   36  * To prevent recursive calls to mcount(), a flag, mcountOff, is set 
   37  * in cpu_flags per_proc.
   38  */
   39 
   40                         .align 4
   41                         .globl mcount
   42 mcount:
   43                 mflr r0                                                                         ; Load lr
   44                 stw r0,8(r1)                                                            ; Save lr on the stack
   45                 stwu r1,-64(r1)                                                         ; Get a stack frame 
   46                 mfmsr   r9                                                                      ; Get msr
   47                 rlwinm  r9,r9,0,MSR_FP_BIT+1,MSR_FP_BIT-1       ; Force floating point off
   48                 rlwinm  r9,r9,0,MSR_VEC_BIT+1,MSR_VEC_BIT-1     ; Force vectors off
   49                 rlwinm  r8,r9,0,MSR_EE_BIT+1,MSR_EE_BIT-1       ; Turn off interruptions
   50                 mtmsr   r8                                                                      ; Update msr    
   51                 isync           
   52                 mfsprg  r7,1                                                            ; Get the current activation
   53                 lwz             r7,ACT_PER_PROC(r7)                                     ; Get the per_proc block
   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  r7,1                                                            ; Get the current activation
   64                 lwz             r7,ACT_PER_PROC(r7)                                     ; Get the per_proc block
   65                 lhz             r6,PP_CPU_FLAGS(r7)                                     ; Get CPU number 
   66                 li              r5,mcountOff                                            ; 
   67                 andc            r6,r6,r5                                                ; Clear mcount_off
   68                 sth             r6,PP_CPU_FLAGS(r7)                                     ; Save cpu_flags
   69 mcount_ret:
   70                 addi r1,r1,64
   71                 mtmsr   r9                                                                      ; Restore MSR
   72                 lwz r0,8(r1)
   73                 mtlr r0
   74                 blr
   75

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FreeBSD/Linux Kernel Cross Reference sys/osfmk/ppc/mcount.s

FreeBSD/Linux Kernel Cross Reference
sys/osfmk/ppc/mcount.s