Replace the old db_memrw.c with the hp300 version, modified for i386
and large page support. This version is a bit more intelligent about how it deals with kernel text pages. Now that this is fixed, don't map the kernel text read-write if DDB is configured.
This commit is contained in:
thorpej
parent
a68986edfc
commit
2fc18ed7a4
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@ -1,38 +1,62 @@
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/* $NetBSD: db_memrw.c,v 1.8 2000/06/29 08:44:51 mrg Exp $ */
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/* $NetBSD: db_memrw.c,v 1.9 2000/09/07 18:46:19 thorpej 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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* Copyright (c) 1996, 2000 The NetBSD Foundation, Inc.
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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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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross and Jason R. Thorpe.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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* Interface to the debugger for virtual memory read/write.
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* This file is shared by DDB and KGDB, and must work even
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* when only KGDB is included (thus no db_printf calls).
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*
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* To write in the text segment, we have to first make
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* the page writable, do the write, then restore the PTE.
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* For writes outside the text segment, and all reads,
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* just do the access -- if it causes a fault, the debugger
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* will recover with a longjmp to an appropriate place.
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*
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* ALERT! If you want to access device registers with a
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* specific size, then the read/write functions have to
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* make sure to do the correct sized pointer access.
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*
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* Modified for i386 from hp300 version by
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* Jason R. Thorpe <thorpej@zembu.com>.
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*/
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#include "opt_largepages.h"
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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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@ -47,61 +71,128 @@
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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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db_read_bytes(vaddr_t addr, size_t size, char *data)
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{
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register char *src;
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char *src;
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src = (char *)addr;
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if (size == 4) {
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*((int *)data) = *((int *)src);
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return;
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}
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if (size == 2) {
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*((short *)data) = *((short *)src);
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return;
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}
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while (size-- > 0)
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*data++ = *src++;
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}
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/*
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* Write bytes somewhere in the kernel text. Make the text
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* pages writable temporarily.
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*/
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static void
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db_write_text(vaddr_t addr, size_t size, char *data)
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{
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pt_entry_t *pte, oldpte, tmppte;
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vaddr_t pgva;
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size_t limit;
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char *dst;
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if (size == 0)
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return;
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dst = (char *)addr;
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do {
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/*
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* Get the PTE for the page.
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*/
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pte = kvtopte(addr);
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oldpte = *pte;
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if ((oldpte & PG_V) == 0) {
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printf(" address %p not a valid page\n", dst);
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return;
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}
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/*
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* Get the VA for the page.
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*/
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#ifdef LARGEPAGES
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if (oldpte & PG_PS)
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pgva = (vaddr_t)dst & PG_LGFRAME;
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else
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#endif
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pgva = i386_trunc_page(dst);
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/*
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* Compute number of bytes that can be written
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* with this mapping and subtract it from the
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* total size.
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*/
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#ifdef LARGEPAGES
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if (oldpte & PG_PS)
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limit = NBPD - ((vaddr_t)dst & (NBPD - 1));
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else
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#endif
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limit = NBPG - ((vaddr_t)dst & PGOFSET);
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if (limit > size)
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limit = size;
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size -= limit;
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tmppte = (oldpte & ~PG_KR) | PG_KW;
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*pte = tmppte;
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pmap_update_pg(pgva);
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/*
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* Page is now writeable. Do as much access as we
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* can in this page.
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*/
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for (; limit > 0; limit--)
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*dst++ = *data++;
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/*
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* Restore the old PTE.
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*/
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*pte = oldpte;
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pmap_update_pg(pgva);
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} while (size != 0);
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}
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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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db_write_bytes(vaddr_t addr, size_t size, char *data)
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{
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register char *dst;
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extern char _etext;
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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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dst = (char *)addr;
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if (addr >= VM_MIN_KERNEL_ADDRESS &&
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addr < (vaddr_t)&etext) {
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ptep0 = PTE_BASE + i386_btop(addr);
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oldmap0 = *ptep0;
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*(int *)ptep0 |= /* INTEL_PTE_WRITE */ PG_RW;
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addr1 = i386_trunc_page(addr + size - 1);
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if (i386_trunc_page(addr) != addr1) {
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/* data crosses a page boundary */
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ptep1 = PTE_BASE + i386_btop(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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/* If any part is in kernel text, use db_write_text() */
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if (addr >= KERNBASE && addr < (vaddr_t)&_etext) {
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db_write_text(addr, size, data);
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return;
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}
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dst = (char *)addr;
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if (size == 4) {
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*((int *)dst) = *((int *)data);
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return;
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}
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if (size == 2) {
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*((short *)dst) = *((short *)data);
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return;
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}
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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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@ -1,4 +1,4 @@
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/* $NetBSD: locore.s,v 1.224 2000/08/20 21:50:08 thorpej Exp $ */
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/* $NetBSD: locore.s,v 1.225 2000/09/07 18:46:19 thorpej Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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@ -596,11 +596,7 @@ try586: /* Use the `cpuid' instruction. */
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movl %edx,%ecx
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subl %eax,%ecx
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shrl $PGSHIFT,%ecx
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#ifdef DDB
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orl $(PG_V|PG_KW),%eax
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#else
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orl $(PG_V|PG_KR),%eax
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#endif
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fillkpt
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/* Map the data, BSS, and bootstrap tables read-write. */
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@ -1,4 +1,4 @@
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/* $NetBSD: pmap.c,v 1.103 2000/09/07 17:20:59 thorpej Exp $ */
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/* $NetBSD: pmap.c,v 1.104 2000/09/07 18:46:19 thorpej Exp $ */
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/*
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*
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@ -64,6 +64,7 @@
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#include "opt_lockdebug.h"
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#include "opt_multiprocessor.h"
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#include "opt_largepages.h"
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -879,16 +880,11 @@ pmap_bootstrap(kva_start)
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kva += NBPD, pa += NBPD) {
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pde = &kpm->pm_pdir[pdei(kva)];
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*pde = pa | pmap_pg_g | PG_PS |
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#ifdef DDB
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PG_KW |
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#else
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PG_KR |
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#endif
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PG_V; /* zap! */
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PG_KR | PG_V; /* zap! */
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tlbflush();
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}
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}
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#endif
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#endif /* LARGEPAGES */
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/*
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* now we allocate the "special" VAs which are used for tmp mappings
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