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Annotation of sys/arch/i386/i386/db_memrw.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: db_memrw.c,v 1.12 2007/02/20 21:15:01 tom Exp $       */
        !             2: /*     $NetBSD: db_memrw.c,v 1.6 1999/04/12 20:38:19 pk Exp $  */
        !             3:
        !             4: /*
        !             5:  * Mach Operating System
        !             6:  * Copyright (c) 1991,1990 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:  *     db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
        !            30:  */
        !            31:
        !            32: /*
        !            33:  * Routines to read and write memory on behalf of the debugger, used
        !            34:  * by DDB and KGDB.
        !            35:  */
        !            36:
        !            37: #include <sys/param.h>
        !            38: #include <sys/proc.h>
        !            39: #include <sys/systm.h>
        !            40:
        !            41: #include <uvm/uvm_extern.h>
        !            42:
        !            43: #include <machine/db_machdep.h>
        !            44:
        !            45: #include <ddb/db_access.h>
        !            46:
        !            47: /*
        !            48:  * Read bytes from kernel address space for debugger.
        !            49:  */
        !            50: void
        !            51: db_read_bytes(vaddr_t addr, size_t size, char *data)
        !            52: {
        !            53:        char    *src;
        !            54:
        !            55:        src = (char *)addr;
        !            56:        while (size-- > 0)
        !            57:                *data++ = *src++;
        !            58: }
        !            59:
        !            60: /*
        !            61:  * Write bytes to kernel address space for debugger.
        !            62:  */
        !            63: void
        !            64: db_write_bytes(vaddr_t addr, size_t size, char *data)
        !            65: {
        !            66:        char    *dst;
        !            67:
        !            68:        pt_entry_t *ptep0 = 0;
        !            69:        pt_entry_t      oldmap0 = { 0 };
        !            70:        vaddr_t addr1;
        !            71:        pt_entry_t *ptep1 = 0;
        !            72:        pt_entry_t      oldmap1 = { 0 };
        !            73:        extern char     etext;
        !            74:
        !            75:        if (addr >= VM_MIN_KERNEL_ADDRESS &&
        !            76:            addr < (vaddr_t)&etext) {
        !            77:                ptep0 = kvtopte(addr);
        !            78:                oldmap0 = *ptep0;
        !            79:                *(int *)ptep0 |= /* INTEL_PTE_WRITE */ PG_RW;
        !            80:
        !            81:                addr1 = trunc_page(addr + size - 1);
        !            82:                if (trunc_page(addr) != addr1) {
        !            83:                        /* data crosses a page boundary */
        !            84:                        ptep1 = kvtopte(addr1);
        !            85:                        oldmap1 = *ptep1;
        !            86:                        *(int *)ptep1 |= /* INTEL_PTE_WRITE */ PG_RW;
        !            87:                }
        !            88:                tlbflush();
        !            89:        }
        !            90:
        !            91:        dst = (char *)addr;
        !            92:
        !            93:        while (size-- > 0)
        !            94:                *dst++ = *data++;
        !            95:
        !            96:        if (ptep0) {
        !            97:                *ptep0 = oldmap0;
        !            98:                if (ptep1)
        !            99:                        *ptep1 = oldmap1;
        !           100:                tlbflush();
        !           101:        }
        !           102: }