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Fix bugs in pmap_protect() that were responsible for the `ld.elf_so lossage'. 

* We could overrun the eva by as much as L1SEG_SIZE-PAGE_SIZE.
* sva was advanced *twice* for each valid l3 or l2 page, causing it to get out
  of sync with the PTE pointers.
This commit is contained in:
mycroft 1999-11-26 23:04:33 +00:00
parent f25449279d
commit f26df92bed
1 changed files with 8 additions and 11 deletions
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19
sys/arch/alpha/alpha/pmap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.115 1999/11/13 00:26:22 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.116 1999/11/26 23:04:33 mycroft Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@ -154,7 +154,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.115 1999/11/13 00:26:22 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.116 1999/11/26 23:04:33 mycroft Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1477,19 +1477,16 @@ pmap_protect(pmap, sva, eva, prot)
isactive = PMAP_ISACTIVE(pmap);
l1pte = pmap_l1pte(pmap, sva);
for (; sva < eva;
sva = alpha_trunc_l1seg(sva) + ALPHA_L1SEG_SIZE, l1pte++) {
for (; sva < eva; sva = l1eva, l1pte++) {
l1eva = alpha_trunc_l1seg(sva) + ALPHA_L1SEG_SIZE;
if (pmap_pte_v(l1pte)) {
l2pte = pmap_l2pte(pmap, sva, l1pte);
for (l1eva = alpha_trunc_l1seg(sva) + ALPHA_L1SEG_SIZE;
sva < l1eva;
sva = alpha_trunc_l2seg(sva) + ALPHA_L2SEG_SIZE,
l2pte++) {
for (; sva < l1eva && sva < eva; sva = l2eva, l2pte++) {
l2eva =
alpha_trunc_l2seg(sva) + ALPHA_L2SEG_SIZE;
if (pmap_pte_v(l2pte)) {
l3pte = pmap_l3pte(pmap, sva, l2pte);
for (l2eva = alpha_trunc_l2seg(sva) +
ALPHA_L2SEG_SIZE;
sva < l2eva;
for (; sva < l2eva && sva < eva;
sva += PAGE_SIZE, l3pte++) {
if (pmap_pte_v(l3pte) &&
pmap_pte_prot_chg(l3pte,