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Annotation of sys/arch/powerpc/ddb/db_memrw.c, Revision 1.1

1.1     ! nbrk        1: /*     $NetBSD: db_memrw.c,v 1.4 2001/05/18 20:38:27 matt Exp $        */
        !             2: /*     $OpenBSD: db_memrw.c,v 1.5 2003/10/15 01:06:13 drahn Exp $      */
        !             3:
        !             4: /*
        !             5:  * Mach Operating System
        !             6:  * Copyright (c) 1992 Carnegie Mellon University
        !             7:  * All Rights Reserved.
        !             8:  *
        !             9:  * Permission to use, copy, modify and distribute this software and its
        !            10:  * documentation is hereby granted, provided that both the copyright
        !            11:  * notice and this permission notice appear in all copies of the
        !            12:  * software, derivative works or modified versions, and any portions
        !            13:  * thereof, and that both notices appear in supporting documentation.
        !            14:  *
        !            15:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            16:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            17:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            18:  *
        !            19:  * Carnegie Mellon requests users of this software to return to
        !            20:  *
        !            21:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
        !            22:  *  School of Computer Science
        !            23:  *  Carnegie Mellon University
        !            24:  *  Pittsburgh PA 15213-3890
        !            25:  *
        !            26:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            27:  * the rights to redistribute these changes.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * Interface to the debugger for virtual memory read/write.
        !            32:  * This is a simple version for kernels with writable text.
        !            33:  * For an example of read-only kernel text, see the file:
        !            34:  * sys/arch/sun3/sun3/db_memrw.c
        !            35:  *
        !            36:  * ALERT!  If you want to access device registers with a
        !            37:  * specific size, then the read/write functions have to
        !            38:  * make sure to do the correct sized pointer access.
        !            39:  */
        !            40:
        !            41: #include <sys/param.h>
        !            42: #include <sys/proc.h>
        !            43: #include <sys/systm.h>
        !            44:
        !            45: #include <uvm/uvm_extern.h>
        !            46:
        !            47: #include <machine/db_machdep.h>
        !            48: #include <machine/pcb.h>
        !            49:
        !            50: #include <ddb/db_access.h>
        !            51:
        !            52: /*
        !            53:  * Read bytes from kernel address space for debugger.
        !            54:  */
        !            55: void
        !            56: db_read_bytes(addr, size, data)
        !            57:        vaddr_t         addr;
        !            58:        size_t  size;
        !            59:        char    *data;
        !            60: {
        !            61:        char    *src = (char *)addr;
        !            62:        faultbuf env;
        !            63:        faultbuf *old_onfault = curpcb->pcb_onfault;
        !            64:        if (setfault(&env)) {
        !            65:                curpcb->pcb_onfault = old_onfault;
        !            66:                return;
        !            67:        }
        !            68:
        !            69:        if (size == 4) {
        !            70:                *((int *)data) = *((int *)src);
        !            71:        } else if (size == 2) {
        !            72:                *((short *)data) = *((short *)src);
        !            73:        } else {
        !            74:                while (size > 0) {
        !            75:                        --size;
        !            76:                        *data++ = *src++;
        !            77:                }
        !            78:        }
        !            79:        curpcb->pcb_onfault = old_onfault;
        !            80: }
        !            81:
        !            82: /*
        !            83:  * Write bytes to kernel address space for debugger.
        !            84:  */
        !            85: void
        !            86: db_write_bytes(addr, size, data)
        !            87:        vaddr_t         addr;
        !            88:        size_t  size;
        !            89:        char    *data;
        !            90: {
        !            91:        char    *dst = (char *)addr;
        !            92:        faultbuf env;
        !            93:        faultbuf *old_onfault = curpcb->pcb_onfault;
        !            94:
        !            95:        if (setfault(&env)) {
        !            96:                curpcb->pcb_onfault = old_onfault;
        !            97:                return;
        !            98:        }
        !            99:
        !           100:        if (size == 4) {
        !           101:                *((int *)dst) = *((int *)data);
        !           102:        } else if (size == 2) {
        !           103:                *((short *)dst) = *((short *)data);
        !           104:        } else  {
        !           105:                while (size > 0) {
        !           106:                        --size;
        !           107:                        *dst++ = *data++;
        !           108:                }
        !           109:        }
        !           110:        syncicache((void *)addr, size);
        !           111:        curpcb->pcb_onfault = old_onfault;
        !           112: }
        !           113: