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Annotation of sys/arch/arm/include/trap.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: trap.h,v 1.1 2004/02/01 05:09:49 drahn Exp $  */
        !             2: /*     $NetBSD: trap.h,v 1.4 2003/04/28 01:54:50 briggs Exp $  */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1995 Mark Brinicombe.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by Mark Brinicombe.
        !            19:  * 4. The name of the company nor the name of the author may be used to
        !            20:  *    endorse or promote products derived from this software without specific
        !            21:  *    prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
        !            24:  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
        !            25:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            26:  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
        !            27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  *
        !            35:  * RiscBSD kernel project
        !            36:  *
        !            37:  * trap.h
        !            38:  *
        !            39:  * Various trap definitions
        !            40:  */
        !            41:
        !            42: /*
        !            43:  * Instructions used for breakpoints.
        !            44:  *
        !            45:  * These are undefined instructions.
        !            46:  * Technically the userspace breakpoint could be a SWI but we want to
        !            47:  * keep this the same as IPKDB which needs an undefined instruction as
        !            48:  * a break point.
        !            49:  *
        !            50:  * Ideally ARM would define several standard instruction sequences for
        !            51:  * use as breakpoints.
        !            52:  *
        !            53:  * The BKPT instruction isn't much use to us, since its behaviour is
        !            54:  * unpredictable on ARMv3 and lower.
        !            55:  *
        !            56:  * The ARM ARM says that for maximum compatibility, we should use undefined
        !            57:  * instructions that look like 0x.7f...f. .
        !            58:  */
        !            59:
        !            60: #define GDB_BREAKPOINT         0xe6000011      /* Used by GDB 4.x */
        !            61: #define IPKDB_BREAKPOINT       0xe6000010      /* Used by IPKDB */
        !            62: #define GDB5_BREAKPOINT                0xe7ffdefe      /* Used by GDB 5.0 */
        !            63: #define KERNEL_BREAKPOINT      0xe7ffffff      /* Used by DDB */
        !            64:
        !            65: #define KBPT_ASM               ".word 0xe7ffdefe"
        !            66:
        !            67: #define USER_BREAKPOINT                GDB_BREAKPOINT
        !            68:
        !            69: #define T_FAULT                        1
        !            70:
        !            71: /* End of trap.h */