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Annotation of sys/arch/arm/include/trap.h, Revision 1.1.1.1

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 */