The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/setstack.s

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    1 /*      $NetBSD: setstack.S,v 1.1 2001/07/28 13:28:03 chris Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1994 Mark Brinicombe.
    5  * Copyright (c) 1994 Brini.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software written for Brini by Mark Brinicombe
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by Brini.
   21  * 4. The name of the company nor the name of the author may be used to
   22  *    endorse or promote products derived from this software without specific
   23  *    prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
   26  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   27  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   28  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   29  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   30  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  * RiscBSD kernel project
   38  *
   39  * setstack.S
   40  *
   41  * Miscellaneous routine to play with the stack pointer in different CPU modes
   42  *
   43  * Eventually this routine can be inline assembly.
   44  *
   45  * Created      : 17/09/94
   46  *
   47  * Based of kate/display/setstack.s
   48  *
   49  */
   50 
   51 #include <machine/armreg.h>
   52 #include <machine/asm.h>
   53 __FBSDID("$FreeBSD: releng/10.0/sys/arm/arm/setstack.s 139735 2005-01-05 21:58:49Z imp $");
   54 
   55 /* To set the stack pointer for a particular mode we must switch
   56  * to that mode update the banked r13 and then switch back.
   57  * This routine provides an easy way of doing this for any mode
   58  *
   59  * r0 = CPU mode
   60  * r1 = stackptr
   61  */
   62 
   63 ENTRY(set_stackptr)
   64         mrs     r3, cpsr_all            /* Switch to the appropriate mode */
   65         bic     r2, r3, #(PSR_MODE)
   66         orr     r2, r2, r0
   67         msr     cpsr_all, r2
   68 
   69         mov     sp, r1                  /* Set the stack pointer */
   70 
   71         msr     cpsr_all, r3            /* Restore the old mode */
   72 
   73         mov     pc, lr                  /* Exit */
   74 
   75 /* To get the stack pointer for a particular mode we must switch
   76  * to that mode copy the banked r13 and then switch back.
   77  * This routine provides an easy way of doing this for any mode
   78  *
   79  * r0 = CPU mode
   80  */
   81 
   82 ENTRY(get_stackptr)
   83         mrs     r3, cpsr_all            /* Switch to the appropriate mode */
   84         bic     r2, r3, #(PSR_MODE)
   85         orr     r2, r2, r0
   86         msr     cpsr_all, r2
   87 
   88         mov     r0, sp                  /* Set the stack pointer */
   89 
   90         msr     cpsr_all, r3            /* Restore the old mode */
   91 
   92         mov     pc, lr                  /* Exit */
   93 
   94 /* End of setstack.S */

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