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Annotation of sys/arch/arm/arm/setstack.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: setstack.S,v 1.2 2004/02/01 06:10:33 drahn Exp $      */
        !             2: /*     $NetBSD: setstack.S,v 1.2 2002/08/15 01:37:02 briggs Exp $      */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1994 Mark Brinicombe.
        !             6:  * Copyright (c) 1994 Brini.
        !             7:  * All rights reserved.
        !             8:  *
        !             9:  * This code is derived from software written for Brini by Mark Brinicombe
        !            10:  *
        !            11:  * Redistribution and use in source and binary forms, with or without
        !            12:  * modification, are permitted provided that the following conditions
        !            13:  * are met:
        !            14:  * 1. Redistributions of source code must retain the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer.
        !            16:  * 2. Redistributions in binary form must reproduce the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer in the
        !            18:  *    documentation and/or other materials provided with the distribution.
        !            19:  * 3. All advertising materials mentioning features or use of this software
        !            20:  *    must display the following acknowledgement:
        !            21:  *     This product includes software developed by Brini.
        !            22:  * 4. The name of the company nor the name of the author may be used to
        !            23:  *    endorse or promote products derived from this software without specific
        !            24:  *    prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
        !            27:  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
        !            28:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            29:  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
        !            30:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            31:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            32:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  * RiscBSD kernel project
        !            39:  *
        !            40:  * setstack.S
        !            41:  *
        !            42:  * Miscellaneous routine to play with the stack pointer in different CPU modes
        !            43:  *
        !            44:  * Eventually this routine can be inline assembly.
        !            45:  *
        !            46:  * Created      : 17/09/94
        !            47:  *
        !            48:  * Based of kate/display/setstack.s
        !            49:  */
        !            50:
        !            51: #include <machine/cpu.h>
        !            52: #include <machine/asm.h>
        !            53:
        !            54: /* To set the stack pointer for a particular mode we must switch
        !            55:  * to that mode update the banked r13 and then switch back.
        !            56:  * This routine provides an easy way of doing this for any mode
        !            57:  *
        !            58:  * r0 = CPU mode
        !            59:  * r1 = stackptr
        !            60:  */
        !            61:
        !            62: ENTRY(set_stackptr)
        !            63:         mrs    r3, cpsr                /* Switch to the appropriate mode */
        !            64:        bic     r2, r3, #(PSR_MODE)
        !            65:        orr     r2, r2, r0
        !            66:         msr    cpsr_all, r2
        !            67:
        !            68:        mov     sp, r1                  /* Set the stack pointer */
        !            69:
        !            70:         msr    cpsr_all, r3            /* Restore the old mode */
        !            71:
        !            72:        mov     pc, lr                  /* Exit */
        !            73:
        !            74: /* To get the stack pointer for a particular mode we must switch
        !            75:  * to that mode copy the banked r13 and then switch back.
        !            76:  * This routine provides an easy way of doing this for any mode
        !            77:  *
        !            78:  * r0 = CPU mode
        !            79:  */
        !            80:
        !            81: ENTRY(get_stackptr)
        !            82:         mrs    r3, cpsr                /* Switch to the appropriate mode */
        !            83:        bic     r2, r3, #(PSR_MODE)
        !            84:        orr     r2, r2, r0
        !            85:         msr    cpsr_all, r2
        !            86:
        !            87:        mov     r0, sp                  /* Set the stack pointer */
        !            88:
        !            89:         msr    cpsr_all, r3            /* Restore the old mode */
        !            90:
        !            91:        mov     pc, lr                  /* Exit */
        !            92:
        !            93: /* End of setstack.S */