112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/* $NetBSD: db_memrw.c,v 1.1 1999/09/13 10:31:28 itojun Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
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*/
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/*
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* Routines to read and write memory on behalf of the debugger, used
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* by DDB and KGDB.
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <machine/db_machdep.h>
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#include <ddb/db_access.h>
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/*
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* Read bytes from kernel address space for debugger.
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*/
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void
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db_read_bytes(addr, size, data)
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vaddr_t addr;
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register size_t size;
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register char *data;
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{
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register char *src;
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src = (char *)addr;
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while (size-- > 0)
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*data++ = *src++;
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}
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#if !defined(PMAP_NEW)
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pt_entry_t *pmap_pte __P((pmap_t, vaddr_t));
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#endif
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/*
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* Write bytes to kernel address space for debugger.
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*/
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void
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db_write_bytes(addr, size, data)
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vaddr_t addr;
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register size_t size;
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register char *data;
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{
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register char *dst;
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register pt_entry_t *ptep0 = 0;
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pt_entry_t oldmap0 = { 0 };
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vaddr_t addr1;
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register pt_entry_t *ptep1 = 0;
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pt_entry_t oldmap1 = { 0 };
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extern char etext;
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if (addr >= VM_MIN_KERNEL_ADDRESS &&
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addr < (vaddrt_t)&etext) {
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ptep0 = pmap_pte(pmap_kernel(), addr);
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oldmap0 = *ptep0;
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*(int *)ptep0 |= /* INTEL_PTE_WRITE */ PG_RW;
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addr1 = sh3_trunc_page(addr + size - 1);
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if (sh3_trunc_page(addr) != addr1) {
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/* data crosses a page boundary */
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ptep1 = pmap_pte(pmap_kernel(), addr1);
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oldmap1 = *ptep1;
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*(int *)ptep1 |= /* INTEL_PTE_WRITE */ PG_RW;
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}
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pmap_update();
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}
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dst = (char *)addr;
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while (size-- > 0)
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*dst++ = *data++;
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if (ptep0) {
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*ptep0 = oldmap0;
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if (ptep1)
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*ptep1 = oldmap1;
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pmap_update();
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}
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}
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