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Annotation of sys/arch/i386/i386/db_memrw.c, Revision 1.1.1.1

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: }