* New file for routines common for kgdb and ddb support.
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matthias
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/* $NetBSD: db_memrw.c,v 1.1 1996/10/09 07:45:00 matthias Exp $ */
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/*
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* Copyright (c) 1996 Gordon W. Ross
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* All rights reserved.
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*
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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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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#include <sys/param.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <machine/pte.h>
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#include <machine/db_machdep.h>
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#include <machine/cpufunc.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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* This used to check for valid PTEs, but now that
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* traps in DDB work correctly, "Just Do It!"
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*/
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void
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db_read_bytes(addr, size, data)
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vm_offset_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 = (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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--size;
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*data++ = *src++;
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}
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}
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static void
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set_pte(addr, pte)
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vm_offset_t addr;
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pt_entry_t pte;
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{
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*(pt_entry_t *)pmap_pte(pmap_kernel(), addr) = pte;
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pmap_update();
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}
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/*
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* Write bytes somewhere in kernel text.
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* Makes text page writable temporarily.
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*/
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static void
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db_write_text(addr, size, data)
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vm_offset_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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pt_entry_t oldpte, tmppte;
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vm_offset_t pgva, prevpg;
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/* Prevent restoring a garbage PTE. */
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if (size <= 0)
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return;
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dst = (char*)addr;
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pgva = ns532_trunc_page((long)dst);
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goto firstpage;
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do {
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/*
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* If we are on a new page, restore the PTE
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* for the previous page, and make the new
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* page writable.
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*/
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pgva = ns532_trunc_page((long)dst);
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if (pgva != prevpg) {
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/*
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* Restore old PTE.
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*/
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set_pte(prevpg, oldpte);
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firstpage:
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oldpte = *(pt_entry_t *)pmap_pte(pmap_kernel(), pgva);
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if ((oldpte & PG_V) == 0) {
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printf(" address 0x%x not a valid page\n", dst);
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return;
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}
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tmppte = oldpte | PG_RW;
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set_pte(pgva, tmppte);
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prevpg = pgva;
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}
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/* Now we can write in this page of kernel text... */
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*dst++ = *data++;
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} while (--size > 0);
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/* Restore old PTE for the last page touched. */
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set_pte(prevpg, oldpte);
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/* Finally, clear the instruction cache. */
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cinv(ia, 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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vm_offset_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 = (char *)addr;
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extern char kernel_text[], etext[];
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/* If any part is in kernel text, use db_write_text() */
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if ((dst < etext) && ((dst + size) > kernel_text)) {
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db_write_text(dst, size, data);
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return;
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}
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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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--size;
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*dst++ = *data++;
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}
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}
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void
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Debugger()
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{
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asm("bpt");
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}
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